20240319

freertos/Source/.github/CODEOWNERS

@@ -0,0 +1,39 @@
+# Each line is a file pattern followed by one or more owners.
+
+# These owners will be the default owners for everything in
+# the repo. Unless a later match takes precedence,
+# @global-owner1 and @global-owner2 will be requested for
+# review when someone opens a pull request.
+*      @FreeRTOS/pr-bar-raiser
+
+# Order is important; the last matching pattern takes the most
+# precedence. When someone opens a pull request that only
+# modifies JS files, only @js-owner and not the global
+# owner(s) will be requested for a review.
+# *.c FreeRTOS/pr-bar-raiser
+
+# You can also use email addresses if you prefer. They'll be
+# used to look up users just like we do for commit author
+# emails.
+# *.go docs@example.com
+
+# In this example, @doctocat owns any files in the build/logs
+# directory at the root of the repository and any of its
+# subdirectories.
+# /build/logs/ @doctocat
+
+# The `docs/*` pattern will match files like
+# `docs/getting-started.md` but not further nested files like
+# `docs/build-app/troubleshooting.md`.
+# docs/*  docs@example.com
+
+# In this example, @octocat owns any file in an apps directory
+# anywhere in your repository.
+# apps/ @octocat
+
+# In this example, @doctocat owns any file in the `/docs`
+# directory in the root of your repository and any of its
+# subdirectories.
+# /docs/ @doctocat
+
+

freertos/Source/.github/CONTRIBUTING.md

@@ -0,0 +1,70 @@
+# Contribution guidelines
+
+Thank you for your interest in contributing to our project. Whether it's a bug report, new feature, code, or
+documentation, we welcome our community to be involved in this project.
+
+Please read through this document before submitting any issues or pull requests to ensure we are able to help you and all members of the community as effectively as possible.
+
+## Code of conduct
+This project has adopted the [Amazon Open Source Code of Conduct](https://aws.github.io/code-of-conduct).
+For more information see the [Code of Conduct FAQ](https://aws.github.io/code-of-conduct-faq) or contact
+opensource-codeofconduct@amazon.com with any additional questions or comments.
+
+
+## Security issue notifications
+If you discover a potential security issue in this project we ask that you notify AWS/Amazon Security via our [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting/). Please do **not** create a public github issue.
+
+
+## Submitting a bugs/feature request
+Have a bug to report or feature to request? Follow these steps:
+1. Search on the [FreeRTOS Community Support Forums](https://forums.freertos.org/) and [GitHub issue tracker](https://github.com/FreeRTOS/FreeRTOS/issues?utf8=%E2%9C%93&q=is%3Aissue) to be sure this hasn't been already reported or discussed.
+2. If your search turns up empty, create a new topic in the [forums](https://forums.freertos.org/) and work with the community to help clarify issues or refine the idea. Include as many of the details listed below.
+3. Once the community has had time to discuss and digest, we welcome you to create an [issue](https://github.com/FreeRTOS/FreeRTOS/issues) to report bugs or suggest features.
+
+When creating a new topic on the forums or filing an issue, please include as many relevant details as possible. Examples include:
+
+* A clear description of the situation - what you observe, what you expect, and your view on how the two differ.
+* A reproducible test case or sequence of steps.
+* The version of our code being used.
+* Any modifications you've made relevant to the bug.
+* Details of your environment or deployment. Highlight anything unusual.
+
+
+## Contributing via pull request
+Contributions via pull requests are much appreciated. Before sending us a pull request, please ensure that:
+
+1. You are working against the latest source on the *main* branch.
+2. You check existing open, and recently merged, pull requests to make sure someone else hasn't addressed the problem already.
+3. You open an issue to discuss any significant work - we would hate for your time to be wasted.
+
+To send us a pull request, please:
+
+1. Fork the repository.
+2. Modify the source; focus on the specific change you are contributing. If you also reformat all the code, it will be hard for us to focus on your change.
+3. Follow the [coding style guide](https://www.FreeRTOS.org/FreeRTOS-Coding-Standard-and-Style-Guide.html).
+4. Commit to your fork using clear commit messages.
+5. Send us a pull request, answering any default questions in the pull request interface.
+   NOTE: Please make sure the default option (Allow edits from maintainers) is left checked.
+6. Pay attention to any automated CI failures reported in the pull request, and stay involved in the conversation.
+
+GitHub provides additional document on [forking a repository](https://help.github.com/articles/fork-a-repo/) and
+[creating a pull request](https://help.github.com/articles/creating-a-pull-request/).
+
+## Coding style
+* Please ensure that your code complies to the [FreeRTOS coding style guidelines](https://www.FreeRTOS.org/FreeRTOS-Coding-Standard-and-Style-Guide.html).
+
+
+## Getting your pull request merged
+All pull requests must be approved by our review team before it can be merged in. We appreciate your patience while pull requests are reviewed. The time it takes to review will depend on complexity and consideration of wider implications.
+
+
+## Finding contributions to work on
+Looking at the existing issues is a great way to find something to contribute on. As our projects, by default, use the default GitHub issue labels (enhancement/bug/duplicate/help wanted/invalid/question/wontfix), tackling open 'help wanted' issues is a great place to start.
+
+
+## Licensing
+The FreeRTOS kernel is released under the MIT open source license, the text of which can be found [here](https://github.com/FreeRTOS/FreeRTOS/blob/main/FreeRTOS/License/license.txt)
+
+Additional license files can be found in the folders containing any supplementary libraries licensed by their respective copyright owners where applicable.
+
+We may ask you to sign a [Contributor License Agreement (CLA)](https://en.wikipedia.org/wiki/Contributor_License_Agreement) for larger changes.

freertos/Source/.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,40 @@
+---
+name: Bug report
+about: Create a report to help us improve FreeRTOS. This should only be used for confirmed
+  bugs. If you suspect something it is best to first discuss it on the FreeRTOS community
+  support forums linked below.
+title: "[BUG]"
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A concise description of what the bug is.
+
+**Target**
+- Development board: [e.g. HiFive11 RevB]
+- Instruction Set Architecture: [e.g. RV32IMAC]
+- IDE and version: [e.g. Freedom Studio 4.12.0.2019-08-2]
+- Toolchain and version: [e.g. riscv64-unknown-elf-gcc-8.3.0-2019.08.0]
+
+**Host**
+- Host OS: [e.g. MacOS]
+- Version: [e.g. Mojave 10.14.6]
+
+**To Reproduce**
+- Use project ... and configure with ...
+- Run on ... and could observe ...
+
+**Expected behavior**
+A concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.
+e.g. code snippet to reproduce the issue.
+e.g. stack trace, memory dump, debugger log, and many etc.
+
+<!-- For general inquiries, please post in [FreeRTOS forum](https://forums.FreeRTOS.org) for community support. -->

freertos/Source/.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,6 @@
+blank_issues_enabled: false
+contact_links:
+  - name: FreeRTOS Community Support Forum
+    url: https://forums.freertos.org/
+    about: Please ask and answer questions about FreeRTOS here.
+

freertos/Source/.github/ISSUE_TEMPLATE/documentation-issue.md

@@ -0,0 +1,23 @@
+---
+name: Documentation issue
+about: Create a report to help us improve our documentation.
+title: "[DOC]"
+labels: documentation
+assignees: ''
+
+---
+
+**Describe the issue**
+Please describe the issue and expected clarification in concise language.
+
+**Reference**
+Please attach the URL at which you are experiencing the issue.
+
+**Screenshot**
+If applicable, please attach screenshot.
+
+**Browser**
+- Browser: [e.g. Chrome]
+- Version: [e.g. 80.0.3987.132]
+
+<!-- For general inquiries, please post in [FreeRTOS forum](https://forums.FreeRTOS.org) for community support. -->

freertos/Source/.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest a new feature for this project
+title: "[Feature Request] <replace with your title>"
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

freertos/Source/.github/SECURITY.md

@@ -0,0 +1,5 @@
+## Reporting a Vulnerability
+
+If you discover a potential security issue in this project we ask that you notify AWS/Amazon Security 
+via our [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting/) or directly via email to aws-security@amazon.com. 
+Please do **not** create a public github issue.

freertos/Source/.github/actions/url_verifier.sh

@@ -0,0 +1,63 @@
+#!/bin/bash -
+
+PROJECT=$1
+echo "Verifying url links of: ${PROJECT}"
+if [ ! -d "$PROJECT" ]
+then
+    echo "Directory passed does not exist"
+    exit 2
+fi
+
+USER_AGENT="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.146 Safari/537.36"
+SCRIPT_RET=0
+
+set -o nounset        # Treat unset variables as an error
+
+declare -A dict
+
+function test {
+    while IFS= read -r LINE; do
+        FILE=$(echo $LINE | cut -f 1 -d ':')
+        URL=$(echo $LINE | grep -IoE '\b(https?|ftp|file)://[-A-Za-z0-9+&@#/%?=~_|!:,.;]*[-A-Za-z0-9+&@#/%=~_|]')
+
+        # remove trailing / if it exists curl diferenciate between links with
+        # and without / at the end
+        # URL=`echo "$URL" | sed 's,/$,,'`
+        dict+=(["$URL"]="$FILE ")
+    done < <(grep -e 'https\?://' ${PROJECT} -RIa --exclude='*.exe' --exclude-dir=.git | tr '*' ' ')
+
+    for UNIQ_URL in ${!dict[@]} # loop urls
+    do
+     CURL_RES=$(curl -si --user-agent "$(USER_AGENT)" ${UNIQ_URL} 2>/dev/null| head -n 1 | cut -f 2 -d ' ')
+     RES=$?
+
+        if [ "${CURL_RES}" == '' -o "${CURL_RES}" != '200' ]
+        then
+            echo "URL is: ${UNIQ_URL}"
+            echo "File names: ${dict[$UNIQ_URL]}"
+            if [ "${CURL_RES}" == '' ]  # curl returned an error
+            then
+                CURL_RES=$RES
+                SCRIPT_RET=1
+                echo ERROR: Result is: "${CURL_RES}"
+            elif [ "${CURL_RES}" == '403' ]
+            then
+                SCRIPT_RET=1
+                echo ERROR: Result is: "${CURL_RES}"
+            else
+                echo WARNING: Result is: "${CURL_RES}"
+            fi
+            echo "================================="
+        fi
+    done
+
+    if [ "${SCRIPT_RET}" -eq 0 ]
+    then
+        exit 0
+    else
+        exit 1
+    fi
+}
+
+test
+

freertos/Source/.github/pull_request_template.md

@@ -0,0 +1,16 @@
+<!--- Title -->
+
+Description
+-----------
+<!--- Describe your changes in detail. -->
+
+Test Steps
+-----------
+<!-- Describe the steps to reproduce. -->
+
+Related Issue
+-----------
+<!-- If any, please provide issue ID. -->
+
+
+By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

freertos/Source/.github/scripts/find_replace.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+old_text=$1
+new_text=$2
+echo "Old text: ${old_text}"
+echo "New text: ${new_text}"
+grep -rl "${old_text}" . | xargs gsed -i -e '1h;2,$H;$!d;g' -e "s/${old_text}/${new_text}/g"
+

freertos/Source/.github/scripts/kernel_checker.py

@@ -0,0 +1,152 @@
+#!/usr/bin/env python3
+#/*
+# * FreeRTOS Kernel V10.4.6
+# * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+# *
+# * SPDX-License-Identifier: MIT
+# *
+# * Permission is hereby granted, free of charge, to any person obtaining a copy of
+# * this software and associated documentation files (the "Software"), to deal in
+# * the Software without restriction, including without limitation the rights to
+# * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# * the Software, and to permit persons to whom the Software is furnished to do so,
+# * subject to the following conditions:
+# *
+# * The above copyright notice and this permission notice shall be included in all
+# * copies or substantial portions of the Software.
+# *
+# * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+# *
+# * https://www.FreeRTOS.org
+# * https://github.com/FreeRTOS
+# *
+# */
+
+import os
+from common.header_checker import HeaderChecker
+
+#--------------------------------------------------------------------------------------------------
+#                                            CONFIG
+#--------------------------------------------------------------------------------------------------
+KERNEL_IGNORED_FILES = [
+    'FreeRTOS-openocd.c',
+    'Makefile',
+    '.DS_Store'
+]
+
+KERNEL_IGNORED_EXTENSIONS = [
+    '.yml',
+    '.css',
+    '.idx',
+    '.md',
+    '.url',
+    '.sty',
+    '.0-rc2',
+    '.s82',
+    '.js',
+    '.out',
+    '.pack',
+    '.2',
+    '.1-kernel-only',
+    '.0-kernel-only',
+    '.0-rc1',
+    '.readme',
+    '.tex',
+    '.png',
+    '.bat',
+    '.sh',
+    '.txt',
+    '.cmake'
+]
+
+KERNEL_ASM_EXTENSIONS = [
+    '.s',
+    '.S',
+    '.src',
+    '.inc',
+    '.s26',
+    '.s43',
+    '.s79',
+    '.s85',
+    '.s87',
+    '.s90',
+    '.asm',
+    '.h'
+]
+
+KERNEL_PY_EXTENSIONS = [
+    '.py'
+]
+
+KERNEL_IGNORED_PATTERNS = [
+    r'.*\.git.*',
+    r'.*portable/IAR/AtmelSAM7S64/.*AT91SAM7.*',
+    r'.*portable/GCC/ARM7_AT91SAM7S/.*',
+    r'.*portable/MPLAB/PIC18F/stdio.h'
+]
+
+KERNEL_THIRD_PARTY_PATTERNS = [
+    r'.*portable/ThirdParty/GCC/Posix/port*',
+    r'.*portable/ThirdParty/*',
+    r'.*portable/IAR/AVR32_UC3/.*',
+    r'.*portable/GCC/AVR32_UC3/.*',
+]
+
+KERNEL_HEADER = [
+    '/*\n',
+    ' * FreeRTOS Kernel V10.4.6\n',
+    ' * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.\n',
+    ' *\n',
+    ' * SPDX-License-Identifier: MIT\n',
+    ' *\n',
+    ' * Permission is hereby granted, free of charge, to any person obtaining a copy of\n',
+    ' * this software and associated documentation files (the "Software"), to deal in\n',
+    ' * the Software without restriction, including without limitation the rights to\n',
+    ' * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of\n',
+    ' * the Software, and to permit persons to whom the Software is furnished to do so,\n',
+    ' * subject to the following conditions:\n',
+    ' *\n',
+    ' * The above copyright notice and this permission notice shall be included in all\n',
+    ' * copies or substantial portions of the Software.\n',
+    ' *\n',
+    ' * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n',
+    ' * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS\n',
+    ' * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR\n',
+    ' * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER\n',
+    ' * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\n',
+    ' * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n',
+    ' *\n',
+    ' * https://www.FreeRTOS.org\n',
+    ' * https://github.com/FreeRTOS\n',
+    ' *\n',
+    ' */\n',
+]
+
+def main():
+    parser = HeaderChecker.configArgParser()
+    args   = parser.parse_args()
+
+    # Configure the checks then run
+    checker = HeaderChecker(KERNEL_HEADER,
+                            ignored_files=KERNEL_IGNORED_FILES,
+                            ignored_ext=KERNEL_IGNORED_EXTENSIONS,
+                            ignored_patterns=KERNEL_IGNORED_PATTERNS,
+                            third_party_patterns=KERNEL_THIRD_PARTY_PATTERNS,
+                            py_ext=KERNEL_PY_EXTENSIONS,
+                            asm_ext=KERNEL_ASM_EXTENSIONS)
+    checker.ignoreFile(os.path.split(__file__)[-1])
+
+    rc = checker.processArgs(args)
+    if rc:
+        checker.showHelp(__file__)
+
+    return rc
+
+if __name__ == '__main__':
+    exit(main())
+

freertos/Source/.github/uncrustify.cfg

@@ -0,0 +1,160 @@
+# Uncrustify-0.67
+input_tab_size                  = 4        # unsigned number
+output_tab_size                 = 4        # unsigned number
+sp_arith                        = force    # ignore/add/remove/force
+sp_assign                       = force    # ignore/add/remove/force
+sp_assign_default               = force    # ignore/add/remove/force
+sp_before_assign                = force    # ignore/add/remove/force
+sp_after_assign                 = force    # ignore/add/remove/force
+sp_enum_assign                  = force    # ignore/add/remove/force
+sp_enum_before_assign           = force    # ignore/add/remove/force
+sp_enum_after_assign            = force    # ignore/add/remove/force
+sp_pp_stringify                 = add      # ignore/add/remove/force
+sp_bool                         = force    # ignore/add/remove/force
+sp_compare                      = force    # ignore/add/remove/force
+sp_inside_paren                 = force    # ignore/add/remove/force
+sp_paren_paren                  = force    # ignore/add/remove/force
+sp_paren_brace                  = force    # ignore/add/remove/force
+sp_before_ptr_star              = force    # ignore/add/remove/force
+sp_before_unnamed_ptr_star      = force    # ignore/add/remove/force
+sp_between_ptr_star             = remove   # ignore/add/remove/force
+sp_after_ptr_star               = force    # ignore/add/remove/force
+sp_before_byref                 = force    # ignore/add/remove/force
+sp_after_byref                  = remove   # ignore/add/remove/force
+sp_after_byref_func             = remove   # ignore/add/remove/force
+sp_before_angle                 = remove   # ignore/add/remove/force
+sp_inside_angle                 = remove   # ignore/add/remove/force
+sp_after_angle                  = force    # ignore/add/remove/force
+sp_before_sparen                = remove   # ignore/add/remove/force
+sp_inside_sparen                = force    # ignore/add/remove/force
+sp_after_sparen                 = force    # ignore/add/remove/force
+sp_sparen_brace                 = force    # ignore/add/remove/force
+sp_before_semi_for              = remove   # ignore/add/remove/force
+sp_before_semi_for_empty        = add      # ignore/add/remove/force
+sp_after_semi_for_empty         = force    # ignore/add/remove/force
+sp_before_square                = remove   # ignore/add/remove/force
+sp_before_squares               = remove   # ignore/add/remove/force
+sp_inside_square                = force    # ignore/add/remove/force
+sp_after_comma                  = force    # ignore/add/remove/force
+sp_after_cast                   = force    # ignore/add/remove/force
+sp_inside_paren_cast            = force    # ignore/add/remove/force
+sp_sizeof_paren                 = remove   # ignore/add/remove/force
+sp_inside_braces_enum           = force    # ignore/add/remove/force
+sp_inside_braces_struct         = force    # ignore/add/remove/force
+sp_inside_braces                = force    # ignore/add/remove/force
+sp_inside_braces_empty          = remove   # ignore/add/remove/force
+sp_type_func                    = force    # ignore/add/remove/force
+sp_func_proto_paren             = remove   # ignore/add/remove/force
+sp_func_def_paren               = remove   # ignore/add/remove/force
+sp_inside_fparens               = remove   # ignore/add/remove/force
+sp_inside_fparen                = force    # ignore/add/remove/force
+sp_fparen_brace                 = add      # ignore/add/remove/force
+sp_func_call_paren              = remove   # ignore/add/remove/force
+sp_func_class_paren             = remove   # ignore/add/remove/force
+sp_return_paren                 = remove   # ignore/add/remove/force
+sp_attribute_paren              = remove   # ignore/add/remove/force
+sp_defined_paren                = remove   # ignore/add/remove/force
+sp_macro                        = force    # ignore/add/remove/force
+sp_macro_func                   = force    # ignore/add/remove/force
+sp_brace_typedef                = force    # ignore/add/remove/force
+sp_before_dc                    = remove   # ignore/add/remove/force
+sp_after_dc                     = remove   # ignore/add/remove/force
+sp_cond_colon                   = force    # ignore/add/remove/force
+sp_cond_question                = force    # ignore/add/remove/force
+sp_case_label                   = force    # ignore/add/remove/force
+sp_endif_cmt                    = force    # ignore/add/remove/force
+sp_before_tr_emb_cmt            = force    # ignore/add/remove/force
+sp_num_before_tr_emb_cmt        = 1        # unsigned number
+indent_columns                  = 4        # unsigned number
+indent_with_tabs                = 0        # unsigned number
+indent_align_string             = true     # false/true
+indent_class                    = true     # false/true
+indent_class_colon              = true     # false/true
+indent_member                   = 3        # unsigned number
+indent_switch_case              = 4        # unsigned number
+indent_case_brace               = 3        # number
+nl_assign_leave_one_liners      = true     # false/true
+nl_class_leave_one_liners       = true     # false/true
+nl_start_of_file                = remove   # ignore/add/remove/force
+nl_end_of_file                  = force    # ignore/add/remove/force
+nl_end_of_file_min              = 1        # unsigned number
+nl_assign_brace                 = add      # ignore/add/remove/force
+nl_func_var_def_blk             = 1        # unsigned number
+nl_fcall_brace                  = add      # ignore/add/remove/force
+nl_enum_brace                   = force    # ignore/add/remove/force
+nl_struct_brace                 = force    # ignore/add/remove/force
+nl_union_brace                  = force    # ignore/add/remove/force
+nl_if_brace                     = add      # ignore/add/remove/force
+nl_brace_else                   = add      # ignore/add/remove/force
+nl_else_brace                   = add      # ignore/add/remove/force
+nl_getset_brace                 = force    # ignore/add/remove/force
+nl_for_brace                    = add      # ignore/add/remove/force
+nl_while_brace                  = add      # ignore/add/remove/force
+nl_do_brace                     = add      # ignore/add/remove/force
+nl_switch_brace                 = add      # ignore/add/remove/force
+nl_multi_line_define            = true     # false/true
+nl_before_case                  = true     # false/true
+nl_after_case                   = true     # false/true
+nl_func_type_name               = remove   # ignore/add/remove/force
+nl_func_proto_type_name         = remove   # ignore/add/remove/force
+nl_func_paren                   = remove   # ignore/add/remove/force
+nl_func_def_paren               = remove   # ignore/add/remove/force
+nl_func_decl_start              = remove   # ignore/add/remove/force
+nl_func_def_start               = remove   # ignore/add/remove/force
+nl_func_decl_args               = add      # ignore/add/remove/force
+nl_func_def_args                = add      # ignore/add/remove/force
+nl_func_decl_end                = remove   # ignore/add/remove/force
+nl_func_def_end                 = remove   # ignore/add/remove/force
+nl_fdef_brace                   = add      # ignore/add/remove/force
+nl_after_semicolon              = true     # false/true
+nl_after_brace_open             = true     # false/true
+nl_after_brace_close            = true     # false/true
+nl_squeeze_ifdef                = true     # false/true
+nl_before_if                    = force    # ignore/add/remove/force
+nl_after_if                     = force    # ignore/add/remove/force
+nl_before_for                   = force    # ignore/add/remove/force
+nl_after_for                    = force    # ignore/add/remove/force
+nl_before_while                 = force    # ignore/add/remove/force
+nl_after_while                  = force    # ignore/add/remove/force
+nl_before_switch                = force    # ignore/add/remove/force
+nl_after_switch                 = force    # ignore/add/remove/force
+nl_before_do                    = force    # ignore/add/remove/force
+nl_after_do                     = force    # ignore/add/remove/force
+nl_max                          = 4        # unsigned number
+nl_after_func_proto_group       = 1        # unsigned number
+nl_after_func_body_class        = 2        # unsigned number
+nl_before_block_comment         = 2        # unsigned number
+eat_blanks_after_open_brace     = true     # false/true
+eat_blanks_before_close_brace   = true     # false/true
+nl_after_return                 = true     # false/true
+pos_bool                        = trail    # ignore/join/lead/lead_break/lead_force/trail/trail_break/trail_force
+align_var_def_amp_style         = 1        # unsigned number
+align_var_def_thresh            = 16       # unsigned number
+align_assign_thresh             = 12       # unsigned number
+align_struct_init_span          = 3        # unsigned number
+align_typedef_gap               = 3        # unsigned number
+align_typedef_span              = 5        # unsigned number
+align_typedef_star_style        = 1        # unsigned number
+align_typedef_amp_style         = 1        # unsigned number
+align_right_cmt_span            = 3        # unsigned number
+align_nl_cont                   = true     # false/true
+align_pp_define_gap             = 4        # unsigned number
+align_pp_define_span            = 3        # unsigned number
+cmt_cpp_to_c                    = true     # false/true
+cmt_star_cont                   = true     # false/true
+mod_full_brace_do               = add      # ignore/add/remove/force
+mod_full_brace_for              = add      # ignore/add/remove/force
+mod_full_brace_if               = add      # ignore/add/remove/force
+mod_full_brace_while            = add      # ignore/add/remove/force
+mod_full_paren_if_bool          = true     # false/true
+mod_remove_extra_semicolon      = true     # false/true
+mod_add_long_ifdef_endif_comment = 10      # unsigned number
+mod_add_long_ifdef_else_comment = 10       # unsigned number
+mod_case_brace                  = remove   # ignore/add/remove/force
+mod_remove_empty_return         = true     # false/true
+pp_indent                       = force    # ignore/add/remove/force
+pp_indent_at_level              = true     # false/true
+pp_indent_count                 = 4        # unsigned number
+pp_space                        = remove   # ignore/add/remove/force
+pp_if_indent_code               = true     # false/true
+# option(s) with 'not default' value: 158

freertos/Source/.github/workflows/auto-release.yml

@@ -0,0 +1,57 @@
+name: Kernel-Auto-Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      commit_id:
+        description: 'Commit ID'
+        required: true
+        default: 'HEAD'
+      version_number:
+        description: 'Version Number (Ex. 10.4.4)'
+        required: true
+        default: '10.4.4'
+      main_br_version:
+        description: "Version String for task.h on main branch (leave empty to leave as-is)."
+        require: false
+        default: ''
+
+jobs:
+  release-packager:
+    name: Release Packager
+    runs-on: ubuntu-latest
+    steps:
+      # Install python 3
+      - name: Tool Setup
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.7.10
+          architecture:   x64
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      # Currently FreeRTOS/.github/scripts houses the release script. Download it for upcoming usage
+      - name: Checkout FreeRTOS Release Tools
+        uses: actions/checkout@v2
+        with:
+          repository: FreeRTOS/FreeRTOS
+          path: tools
+
+      # Simpler git auth if we use checkout action and forward the repo to release script
+      - name: Checkout FreeRTOS Kernel
+        uses: actions/checkout@v2
+        with:
+          path: local_kernel
+          fetch-depth: 0
+
+      - name: Release
+        run: |
+          # Configure repo for push
+          git config --global user.name ${{ github.actor }}
+          git config --global user.email ${{ github.actor }}@users.noreply.github.com
+          # Install deps and run
+          pip install -r ./tools/.github/scripts/release-requirements.txt
+          ./tools/.github/scripts/release.py FreeRTOS --kernel-repo-path=local_kernel --kernel-commit=${{ github.event.inputs.commit_id }} --new-kernel-version=${{ github.event.inputs.version_number }} --new-kernel-main-br-version=${{ github.event.inputs.main_br_version }}
+          exit $?
+        env:
+            GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

freertos/Source/.github/workflows/ci.yml

@@ -0,0 +1,68 @@
+name: CI Checks
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+jobs:
+  spell-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Parent Repo
+        uses: actions/checkout@v2
+        with:
+          ref: main
+          repository: aws/aws-iot-device-sdk-embedded-C
+          path: main
+      - name: Clone This Repo
+        uses: actions/checkout@v2
+        with:
+            path: ./kernel
+      - name: Install spell
+        run: |
+          sudo apt-get install spell
+          sudo apt-get install util-linux
+      - name: Check spelling
+        run: |
+          PATH=$PATH:main/tools/spell
+          # Make sure that the portable directory is not included in the spellcheck.
+          sed -i 's/find $DIRNAME/find $DIRNAME -not -path '*portable*'/g' main/tools/spell/find-unknown-comment-words
+          find-unknown-comment-words --directory kernel/ --lexicon ./kernel/.github/lexicon.txt
+          if [ "$?" = "0" ]; then
+            exit 0
+          else
+            exit 1
+          fi
+  formatting:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Uncrustify
+        run: sudo apt-get install uncrustify
+      - name: Run Uncrustify
+        run: |
+          uncrustify --version
+          find . \( -name portable \) -prune -false -o -iname "*.[hc]" -exec uncrustify --check -c .github/uncrustify.cfg {} +
+      - name: Check For Trailing Whitespace
+        run: |
+          set +e
+          grep --exclude="README.md" --exclude-dir="portable"  -rnI -e "[[:blank:]]$" .
+          if [ "$?" = "0" ]; then
+            echo "Files have trailing whitespace."
+            exit 1
+          else
+            exit 0
+          fi
+
+  url-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Clone This Repo
+        uses: actions/checkout@v2
+        with:
+            path: ./kernel
+      - name: URL Checker
+        run: |
+            bash kernel/.github/actions/url_verifier.sh kernel
+

freertos/Source/.github/workflows/git-secrets.yml

@@ -0,0 +1,24 @@
+name: git-secrets Check
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+jobs:
+  git-secrets:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+      - name: Checkout awslabs/git-secrets
+        uses: actions/checkout@v2
+        with:
+          repository: awslabs/git-secrets
+          ref: master
+          path: git-secrets
+      - name: Install git-secrets
+        run: cd git-secrets && sudo make install && cd ..
+      - name: Run git-secrets
+        run: |
+          git-secrets --register-aws
+          git-secrets --scan

freertos/Source/.github/workflows/kernel-checks.yml

@@ -0,0 +1,72 @@
+name: Kernel-Checker
+
+on: [push, pull_request]
+
+jobs:
+  kernel-checker:
+    name: FreeRTOS Kernel Header Checks
+    runs-on: ubuntu-latest
+    steps:
+      # Install python 3
+      - name: Tool Setup
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.7.10
+          architecture:   x64
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      # There is shared code, hosted by FreeRTOS/FreeRTOS, with deps needed by header checker
+      - name: Checkout FreeRTOS Tools
+        uses: actions/checkout@v2
+        with:
+          repository: FreeRTOS/FreeRTOS
+          ref:  main
+          path: tools
+
+      # Checkout user pull request changes
+      - name: Checkout Pull Request
+        uses: actions/checkout@v2
+        with:
+          ref:  ${{ github.event.pull_request.head.sha }}
+          path: inspect
+
+      # Collect all affected files
+      - name: Collecting changed files
+        uses: lots0logs/gh-action-get-changed-files@2.1.4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      # Run checks
+      - name: Check File Headers
+        run: |
+          mv tools/.github/scripts/common inspect/.github/scripts
+          pip install -r inspect/.github/scripts/common/requirements.txt
+          cd inspect
+          .github/scripts/kernel_checker.py --json ${HOME}/files_modified.json ${HOME}/files_added.json ${HOME}/files_renamed.json
+          exit $?
+  build-checker:
+    name: FreeRTOS Posix Build Check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the parent repository
+        uses: actions/checkout@v2
+        with:
+          ref: main
+          repository: FreeRTOS/FreeRTOS
+          submodules: 'recursive'
+          fetch-depth: 1
+          path: ./workspace
+      - name: Checkout the current repository
+        uses: actions/checkout@v2
+        with:
+          path: ./workspace/FreeRTOS/Source
+      - name: Posix Build Checker
+        run: |
+              bash workspace/.github/scripts/posix_build_checker.sh workspace
+      - name: Install lib pcap dev
+        run: |
+          sudo apt-get install libpcap-dev
+      - name: Posix Network Build Checker
+        run: |
+          bash workspace/.github/scripts/posix_network_build_checker.sh workspace

freertos/Source/.github/workflows/unit-tests.yml

@@ -0,0 +1,56 @@
+name: CMock Unit Tests
+on: [push, pull_request]
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout Parent Repository
+      uses: actions/checkout@v2
+      with:
+        ref: main
+        repository: FreeRTOS/FreeRTOS
+        submodules: 'recursive'
+        fetch-depth: 1
+    - name: Clone This Repo
+      uses: actions/checkout@v2
+      with:
+        path: ./FreeRTOS/Source
+
+    - name: Setup Python
+      uses: actions/setup-python@master
+      with:
+        python-version: 3.8
+
+    - name: Install packages
+      run: |
+          sudo apt-get install lcov cflow ruby doxygen build-essential
+    - name: Run Unit Tests with ENABLE_SANITIZER=1
+      run: |
+          make -C FreeRTOS/Test/CMock clean
+          make -C FreeRTOS/Test/CMock ENABLE_SANITIZER=1 run_col_formatted
+    - name: Run Unit Tests for coverage
+      run: |
+          make -C FreeRTOS/Test/CMock clean
+          make -C FreeRTOS/Test/CMock lcovhtml
+          lcov --config-file FreeRTOS/Test/CMock/lcovrc --summary FreeRTOS/Test/CMock/build/cmock_test.info > FreeRTOS/Test/CMock/build/cmock_test_summary.txt
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v1
+      with:
+        files: FreeRTOS/Test/CMock/build/cmock_test.info
+        working-directory: .
+        root_dir: FreeRTOS/Source
+        flags: unittests
+        fail_ci_if_error: false
+        path_to_write_report: coverage/codecov_report.txt
+        verbose: false
+    - name: Archive code coverage data
+      uses: actions/upload-artifact@v2
+      with:
+        name: coverage-data
+        path: FreeRTOS/Test/CMock/build/cmock_test*
+    - name: Archive code coverage html report
+      uses: actions/upload-artifact@v2
+      with:
+        name: coverage-report
+        path: FreeRTOS/Test/CMock/build/coverage

freertos/Source/.gitmodules

@@ -0,0 +1,6 @@
+[submodule "ThirdParty/FreeRTOS-Kernel-Partner-Supported-Ports"]
+	path = portable/ThirdParty/Partner-Supported-Ports
+	url = https://github.com/FreeRTOS/FreeRTOS-Kernel-Partner-Supported-Ports
+[submodule "ThirdParty/FreeRTOS-Kernel-Community-Supported-Ports"]
+	path = portable/ThirdParty/Community-Supported-Ports
+	url = https://github.com/FreeRTOS/FreeRTOS-Kernel-Community-Supported-Ports

freertos/Source/CONTRIBUTING.md

@@ -0,0 +1,70 @@
+# Contribution guidelines
+
+Thank you for your interest in contributing to our project. Whether it's a bug report, new feature, code, or
+documentation, we welcome our community to be involved in this project.
+
+Please read through this document before submitting any issues or pull requests to ensure we are able to help you and all members of the community as effectively as possible.
+
+## Code of conduct
+This project has adopted the [Amazon Open Source Code of Conduct](https://aws.github.io/code-of-conduct).
+For more information see the [Code of Conduct FAQ](https://aws.github.io/code-of-conduct-faq) or contact
+opensource-codeofconduct@amazon.com with any additional questions or comments.
+
+
+## Security issue notifications
+If you discover a potential security issue in this project we ask that you notify AWS/Amazon Security via our [vulnerability reporting page](http://aws.amazon.com/security/vulnerability-reporting/). Please do **not** create a public github issue.
+
+
+## Submitting a bugs/feature request
+Have a bug to report or feature to request? Follow these steps:
+1. Search on the [FreeRTOS Community Support Forums](https://forums.freertos.org/) and [GitHub issue tracker](https://github.com/FreeRTOS/FreeRTOS/issues?utf8=%E2%9C%93&q=is%3Aissue) to be sure this hasn't been already reported or discussed.
+2. If your search turns up empty, create a new topic in the [forums](https://forums.freertos.org/) and work with the community to help clarify issues or refine the idea. Include as many of the details listed below.
+3. Once the community has had time to discuss and digest, we welcome you to create an [issue](https://github.com/FreeRTOS/FreeRTOS/issues) to report bugs or suggest features.
+
+When creating a new topic on the forums or filing an issue, please include as many relevant details as possible. Examples include:
+
+* A clear description of the situation — what you observe, what you expect, and your view on how the two differ.
+* A reproducible test case or sequence of steps.
+* The version of our code being used.
+* Any modifications you've made relevant to the bug.
+* Details of your environment or deployment. Highlight anything unusual.
+
+
+## Contributing via pull request
+Contributions via pull requests are much appreciated. Before sending us a pull request, please ensure that:
+
+1. You are working against the latest source on the *master* branch.
+2. You check existing open, and recently merged, pull requests to make sure someone else hasn't addressed the problem already.
+3. You open an issue to discuss any significant work - we would hate for your time to be wasted.
+
+To send us a pull request, please:
+
+1. Fork the repository.
+2. Modify the source; focus on the specific change you are contributing. If you also reformat all the code, it will be hard for us to focus on your change.
+3. Follow the [coding style guide](https://www.FreeRTOS.org/FreeRTOS-Coding-Standard-and-Style-Guide.html).
+4. Commit to your fork using clear commit messages.
+5. Send us a pull request, answering any default questions in the pull request interface.
+   NOTE: Please make sure the default option (Allow edits from maintainers) is left checked.
+6. Pay attention to any automated CI failures reported in the pull request, and stay involved in the conversation.
+
+GitHub provides additional document on [forking a repository](https://help.github.com/articles/fork-a-repo/) and
+[creating a pull request](https://help.github.com/articles/creating-a-pull-request/).
+
+## Coding style
+* Please ensure that your code complies to the [FreeRTOS coding style guidelines](https://www.FreeRTOS.org/FreeRTOS-Coding-Standard-and-Style-Guide.html).
+
+
+## Getting your pull request merged
+All pull requests must be approved by our review team before it can be merged in. We appreciate your patience while pull requests are reviewed. The time it takes to review will depend on complexity and consideration of wider implications.
+
+
+## Finding contributions to work on
+Looking at the existing issues is a great way to find something to contribute on. As our projects, by default, use the default GitHub issue labels (enhancement/bug/duplicate/help wanted/invalid/question/wontfix), tackling open 'help wanted' issues is a great place to start.
+
+
+## Licensing
+The FreeRTOS kernel is released under the MIT open source license, the text of which can be found [here](https://github.com/FreeRTOS/FreeRTOS/blob/master/FreeRTOS/License/license.txt)
+
+Additional license files can be found in the folders containing any supplementary libraries licensed by their respective copyright owners where applicable.
+
+We may ask you to sign a [Contributor License Agreement (CLA)](http://en.wikipedia.org/wiki/Contributor_License_Agreement) for larger changes.

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX.h

@@ -0,0 +1,50 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX.h
+ * @brief FreeRTOS+POSIX header.
+ *
+ * This file must be included before all other FreeRTOS+POSIX includes.
+ */
+
+#ifndef _FREERTOS_POSIX_H_
+#define _FREERTOS_POSIX_H_
+
+/* FreeRTOS+POSIX platform-specific configuration headers. */
+#include "FreeRTOS_POSIX_portable.h"
+#include "FreeRTOS_POSIX_portable_default.h"
+
+/* FreeRTOS includes. */
+#include "FreeRTOS.h"
+#include "event_groups.h"
+#include "semphr.h"
+#include "task.h"
+
+/* FreeRTOS+POSIX data types and internal structs. */
+#include "FreeRTOS_POSIX/sys/types.h"
+#include "FreeRTOS_POSIX_internal.h"
+
+#endif /* _FREERTOS_POSIX_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX_internal.h

@@ -0,0 +1,129 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+#ifndef _FREERTOS_POSIX_INTERNAL_H_
+#define _FREERTOS_POSIX_INTERNAL_H_
+
+/**
+ * @file FreeRTOS_POSIX_internal.h
+ * @brief Internal structs and initializers for FreeRTOS+POSIX.
+ */
+
+/* Amazon FreeRTOS includes. */
+#include "iot_doubly_linked_list.h"
+
+/**
+ * @brief Mutex attribute object.
+ */
+#if posixconfigENABLE_PTHREAD_MUTEXATTR_T == 1
+    typedef struct pthread_mutexattr_internal
+    {
+        int iType; /**< Mutex type. */
+    } pthread_mutexattr_internal_t;
+#endif
+
+#if posixconfigENABLE_PTHREAD_MUTEX_T == 1
+
+/**
+ * @brief Mutex.
+ */
+    typedef struct pthread_mutex_internal
+    {
+        BaseType_t xIsInitialized;          /**< Set to pdTRUE if this mutex is initialized, pdFALSE otherwise. */
+        StaticSemaphore_t xMutex;           /**< FreeRTOS mutex. */
+        TaskHandle_t xTaskOwner;            /**< Owner; used for deadlock detection and permission checks. */
+        pthread_mutexattr_internal_t xAttr; /**< Mutex attributes. */
+    } pthread_mutex_internal_t;
+
+/**
+ * @brief Compile-time initializer of pthread_mutex_internal_t.
+ */
+    #define FREERTOS_POSIX_MUTEX_INITIALIZER \
+    ( ( ( pthread_mutex_internal_t )         \
+    {                                        \
+        .xIsInitialized = pdFALSE,           \
+        .xMutex = { { 0 } },                 \
+        .xTaskOwner = NULL,                  \
+        .xAttr = { .iType = 0 }              \
+    }                                        \
+        )                                    \
+    )
+#endif /* if posixconfigENABLE_PTHREAD_MUTEX_T == 1 */
+
+#if posixconfigENABLE_PTHREAD_COND_T == 1
+
+/**
+ * @brief Condition variable.
+ */
+    typedef struct pthread_cond_internal
+    {
+        BaseType_t xIsInitialized;            /**< Set to pdTRUE if this condition variable is initialized, pdFALSE otherwise. */
+        StaticSemaphore_t xCondWaitSemaphore; /**< Threads block on this semaphore in pthread_cond_wait. */
+        unsigned iWaitingThreads;             /**< The number of threads currently waiting on this condition variable. */
+    } pthread_cond_internal_t;
+
+/**
+ * @brief Compile-time initializer of pthread_cond_internal_t.
+ */
+
+    #define FREERTOS_POSIX_COND_INITIALIZER \
+    ( ( ( pthread_cond_internal_t )         \
+    {                                       \
+        .xIsInitialized = pdFALSE,          \
+        .xCondWaitSemaphore = { { 0 } },    \
+        .iWaitingThreads = 0                \
+    }                                       \
+        )                                   \
+    )
+
+#endif /* if posixconfigENABLE_PTHREAD_COND_T == 1 */
+
+#if posixconfigENABLE_SEM_T == 1
+
+/**
+ * @brief Semaphore type.
+ */
+    typedef struct
+    {
+        StaticSemaphore_t xSemaphore; /**< FreeRTOS semaphore. */
+        int value;                    /**< POSIX semaphore count. */
+    } sem_internal_t;
+#endif /* if posixconfigENABLE_SEM_T == 1 */
+
+#if posixconfigENABLE_PTHREAD_BARRIER_T == 1
+
+/**
+ * @brief Barrier object.
+ */
+    typedef struct pthread_barrier_internal
+    {
+        unsigned uThreadCount;                   /**< Current number of threads that have entered barrier. */
+        unsigned uThreshold;                     /**< The count argument of pthread_barrier_init. */
+        StaticSemaphore_t xThreadCountSemaphore; /**< Prevents more than uThreshold threads from exiting pthread_barrier_wait at once. */
+        StaticEventGroup_t xBarrierEventGroup;   /**< FreeRTOS event group that blocks to wait on threads entering barrier. */
+    } pthread_barrier_internal_t;
+#endif /* if posixconfigENABLE_PTHREAD_BARRIER_T == 1 */
+
+#endif /* _FREERTOS_POSIX_INTERNAL_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX_types.h

@@ -0,0 +1,81 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+#ifndef _FREERTOS_POSIX_INTERNAL_TYPES_H_
+#define _FREERTOS_POSIX_INTERNAL_TYPES_H_
+
+#include "FreeRTOS_POSIX_internal.h"
+
+/*
+ * sys/types.h defines a POSIX type when posixconfigENABLE_PTHREAD_<TYPE>_T
+ * is not defined AND when posixconfigENABLE_PTHREAD_<TYPE>_T is set to 1.
+ * FreeRTOS_POSIX_internal.h defines internal type ONLY when
+ * posixconfigENABLE_PTHREAD_<TYPE>_T is set to 1.
+ * #else part below is to have a type defined, so the code compiles, when
+ * posixconfigENABLE_PTHREAD_<TYPE>_T is not defined.
+ */
+#if posixconfigENABLE_PTHREAD_MUTEX_T == 1
+    typedef pthread_mutex_internal_t   PthreadMutexType_t;
+#else
+    typedef void                       * PthreadMutexType_t;
+#endif
+
+#if posixconfigENABLE_PTHREAD_COND_T == 1
+    typedef pthread_cond_internal_t    PthreadCondType_t;
+#else
+    typedef void                       * PthreadCondType_t;
+#endif
+
+#if posixconfigENABLE_SEM_T == 1
+    typedef sem_internal_t             PosixSemType_t;
+#else
+    typedef void                       * PosixSemType_t;
+#endif
+
+#if posixconfigENABLE_PTHREAD_MUTEXATTR_T == 1
+    typedef struct pthread_mutexattr
+    {
+        uint32_t ulpthreadMutexAttrStorage;
+    } PthreadMutexAttrType_t;
+#else
+    typedef void * PthreadMutexAttrType_t;
+#endif
+
+#if posixconfigENABLE_PTHREAD_ATTR_T == 1
+    typedef struct pthread_attr
+    {
+        uint32_t ulpthreadAttrStorage;
+    } PthreadAttrType_t;
+#else
+    typedef void                       * PthreadAttrType_t;
+#endif
+
+#if posixconfigENABLE_PTHREAD_BARRIER_T == 1
+    typedef pthread_barrier_internal_t PthreadBarrierType_t;
+#else
+    typedef void                       * PthreadBarrierType_t;
+#endif
+
+#endif /* _FREERTOS_POSIX_INTERNAL_TYPES_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/include/portable/FreeRTOS_POSIX_portable_default.h

@@ -0,0 +1,145 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_portable_default.h
+ * @brief Defaults for port-specific configuration of FreeRTOS+POSIX.
+ */
+
+#ifndef _FREERTOS_POSIX_PORTABLE_DEFAULT_H_
+#define _FREERTOS_POSIX_PORTABLE_DEFAULT_H_
+
+/**
+ * @name The FreeRTOS task name given to pthreads.
+ */
+/**@{ */
+#ifndef posixconfigPTHREAD_TASK_NAME
+    #define posixconfigPTHREAD_TASK_NAME    "pthread" /**< Task name. */
+#endif
+/**@} */
+
+/**
+ * @name the FreeRTOS timer name given to POSIX timers.
+ */
+/**@{ */
+#ifndef posixconfigTIMER_NAME
+    #define posixconfigTIMER_NAME    "timer" /**< Timer name. */
+#endif
+/**@} */
+
+/**
+ * @name Defaults for POSIX message queue implementation.
+ */
+/**@{ */
+#ifndef posixconfigMQ_MAX_MESSAGES
+    #define posixconfigMQ_MAX_MESSAGES    10 /**< Maximum number of messages in an mq at one time. */
+#endif
+
+#ifndef posixconfigMQ_MAX_SIZE
+    #define posixconfigMQ_MAX_SIZE    128 /**< Maximum size (in bytes) of each message. */
+#endif
+/**@} */
+
+/**
+ * @name POSIX implementation-dependent constants usually defined in limits.h.
+ *
+ * They are defined here to provide portability between platforms.
+ */
+/**@{ */
+#ifndef PTHREAD_STACK_MIN
+    #define PTHREAD_STACK_MIN    configMINIMAL_STACK_SIZE * sizeof( StackType_t ) /**< Minimum size in bytes of thread stack storage. */
+#endif
+#ifndef NAME_MAX
+    #define NAME_MAX             64                                               /**< Maximum number of bytes in a filename (not including terminating null). */
+#endif
+#ifndef SEM_VALUE_MAX
+    #define SEM_VALUE_MAX        0x7FFFU                                          /**< Maximum value of a sem_t. */
+#endif
+/**@} */
+
+/**
+ * @name Enable typedefs of POSIX types.
+ *
+ * Set these values to 1 or 0 to enable or disable the typedefs, respectively.
+ * These typedefs should only be disabled if they conflict with system typedefs.
+ */
+/**@{ */
+#ifndef posixconfigENABLE_CLOCK_T
+    #define posixconfigENABLE_CLOCK_T                1 /**< clock_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_CLOCKID_T
+    #define posixconfigENABLE_CLOCKID_T              1 /**< clockid_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_MODE_T
+    #define posixconfigENABLE_MODE_T                 1 /**< mode_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_PID_T
+    #define posixconfigENABLE_PID_T                  1 /**< pid_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_PTHREAD_ATTR_T
+    #define posixconfigENABLE_PTHREAD_ATTR_T         1 /**< pthread_attr_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_PTHREAD_COND_T
+    #define posixconfigENABLE_PTHREAD_COND_T         1 /**< pthread_cond_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_PTHREAD_CONDATTR_T
+    #define posixconfigENABLE_PTHREAD_CONDATTR_T     1 /**< pthread_condattr_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_PTHREAD_MUTEX_T
+    #define posixconfigENABLE_PTHREAD_MUTEX_T        1 /**< pthread_mutex_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_PTHREAD_MUTEXATTR_T
+    #define posixconfigENABLE_PTHREAD_MUTEXATTR_T    1 /**< pthread_mutexattr_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_PTHREAD_T
+    #define posixconfigENABLE_PTHREAD_T              1 /**< pthread_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_SSIZE_T
+    #define posixconfigENABLE_SSIZE_T                1 /**< ssize_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_TIME_T
+    #define posixconfigENABLE_TIME_T                 1 /**< time_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_TIMER_T
+    #define posixconfigENABLE_TIMER_T                1 /**< timer_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_USECONDS_T
+    #define posixconfigENABLE_USECONDS_T             1 /**< useconds_t in sys/types.h */
+#endif
+#ifndef posixconfigENABLE_TIMESPEC
+    #define posixconfigENABLE_TIMESPEC               1 /**< struct timespec in time.h */
+#endif
+#ifndef posixconfigENABLE_ITIMERSPEC
+    #define posixconfigENABLE_ITIMERSPEC             1 /**< struct itimerspec in time.h */
+#endif
+#ifndef posixconfigENABLE_SEM_T
+    #define posixconfigENABLE_SEM_T                  1 /**< struct sem_t in semaphore.h */
+#endif
+#ifndef posixconfigENABLE_PTHREAD_BARRIER_T
+    #define posixconfigENABLE_PTHREAD_BARRIER_T      1 /**< pthread_barrier_t in sys/types.h */
+#endif
+/**@} */
+
+#endif /* ifndef _FREERTOS_POSIX_PORTABLE_DEFAULT_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/include/portable/espressif/esp32_devkitc_esp_wrover_kit/FreeRTOS_POSIX_portable.h

@@ -0,0 +1,60 @@
+/*
+ * Amazon FreeRTOS+POSIX V1.0.4
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_portable.h
+ * @brief Port-specific configuration of FreeRTOS+POSIX.
+ */
+
+#ifndef _FREERTOS_POSIX_PORTABLE_H_
+#define _FREERTOS_POSIX_PORTABLE_H_
+
+/* ESP-IDF already defines the following types. */
+#define posixconfigENABLE_CLOCK_T                0
+#define posixconfigENABLE_CLOCKID_T              0
+#define posixconfigENABLE_MODE_T                 0
+#define posixconfigENABLE_PTHREAD_ATTR_T         0
+#define posixconfigENABLE_PTHREAD_COND_T         0
+#define posixconfigENABLE_PTHREAD_CONDATTR_T     0
+#define posixconfigENABLE_PTHREAD_MUTEX_T        0
+#define posixconfigENABLE_PTHREAD_MUTEXATTR_T    0
+#define posixconfigENABLE_PTHREAD_T              0
+#define posixconfigENABLE_TIME_T                 0
+#define posixconfigENABLE_TIMESPEC               0
+#define posixconfigENABLE_ITIMERSPEC             0
+
+/* ESP-IDF already provides the header sched.h. Exclude FreeRTOS+POSIX sched.h by
+ * defining its double inclusion guard. */
+#define _FREERTOS_POSIX_SCHED_H_
+
+/* Use the FreeRTOS+POSIX time.h header instead of the ESP-IDF time.h. Disable
+ * ESP-IDF time.h by defining its double inclusion guard. */
+#define _TIME_H_
+
+/* Disable the timer_t type defined by ESP-IDF. */
+#define __timer_t_defined
+#include <sys/types.h>
+
+#endif /* _FREERTOS_POSIX_PORTABLE_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/include/portable/microchip/curiosity_pic32mzef/FreeRTOS_POSIX_portable.h

@@ -0,0 +1,50 @@
+/*
+ * Amazon FreeRTOS+POSIX V1.0.4
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_portable.h
+ * @brief Port-specific configuration of FreeRTOS+POSIX.
+ */
+
+#ifndef _FREERTOS_POSIX_PORTABLE_H_
+#define _FREERTOS_POSIX_PORTABLE_H_
+
+/* Microchip includes. */
+#include <sys/types.h>
+
+/* Microchip already typedefs the following types. */
+#define posixconfigENABLE_MODE_T        0
+#define posixconfigENABLE_PID_T         0
+#define posixconfigENABLE_SSIZE_T       0
+#define posixconfigENABLE_USECONDS_T    0
+/* Microchip -mnewlib compiler option supports these types. */
+#define posixconfigENABLE_TIMESPEC      0
+#define posixconfigENABLE_ITIMERSPEC    0
+#define posixconfigENABLE_CLOCKID_T     0
+#define posixconfigENABLE_TIME_T        0
+#define posixconfigENABLE_TIMER_T       0
+
+
+#endif /* _FREERTOS_POSIX_PORTABLE_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/include/portable/nxp/lpc54018iotmodule/FreeRTOS_POSIX_portable.h

@@ -0,0 +1,37 @@
+/*
+ * Amazon FreeRTOS+POSIX V1.0.4
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_portable.h
+ * @brief Port-specific configuration of FreeRTOS+POSIX.
+ */
+
+#ifndef _FREERTOS_POSIX_PORTABLE_H_
+#define _FREERTOS_POSIX_PORTABLE_H_
+
+/* This port uses the defaults in FreeRTOS_POSIX_portable_default.h, so this
+ * file is empty. */
+
+#endif /* _FREERTOS_POSIX_PORTABLE_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/include/portable/pc/windows/FreeRTOS_POSIX_portable.h

@@ -0,0 +1,37 @@
+/*
+ * Amazon FreeRTOS+POSIX V1.0.4
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_portable.h
+ * @brief Port-specific configuration of FreeRTOS+POSIX.
+ */
+
+#ifndef _FREERTOS_POSIX_PORTABLE_H_
+#define _FREERTOS_POSIX_PORTABLE_H_
+
+/* This port uses the defaults in FreeRTOS_POSIX_portable_default.h, so this
+ * file is empty. */
+
+#endif /* _FREERTOS_POSIX_PORTABLE_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/include/portable/st/stm32l475_discovery/FreeRTOS_POSIX_portable.h

@@ -0,0 +1,37 @@
+/*
+ * Amazon FreeRTOS+POSIX V1.0.4
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_portable.h
+ * @brief Port-specific configuration of FreeRTOS+POSIX.
+ */
+
+#ifndef _FREERTOS_POSIX_PORTABLE_H_
+#define _FREERTOS_POSIX_PORTABLE_H_
+
+/* This port uses the defaults in FreeRTOS_POSIX_portable_default.h, so this
+ * file is empty. */
+
+#endif /* _FREERTOS_POSIX_PORTABLE_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/include/portable/ti/cc3220_launchpad/FreeRTOS_POSIX_portable.h

@@ -0,0 +1,37 @@
+/*
+ * Amazon FreeRTOS+POSIX V1.0.4
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_portable.h
+ * @brief Port-specific configuration of FreeRTOS+POSIX.
+ */
+
+#ifndef _FREERTOS_POSIX_PORTABLE_H_
+#define _FREERTOS_POSIX_PORTABLE_H_
+
+/* This port uses the defaults in FreeRTOS_POSIX_portable_default.h, so this
+ * file is empty. */
+
+#endif /* _FREERTOS_POSIX_PORTABLE_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_clock.c

@@ -0,0 +1,240 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_clock.c
+ * @brief Implementation of clock functions in time.h
+ */
+
+/* C standard library includes. */
+#include <stddef.h>
+#include <string.h>
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX.h"
+#include "FreeRTOS_POSIX/errno.h"
+#include "FreeRTOS_POSIX/time.h"
+#include "FreeRTOS_POSIX/utils.h"
+
+/* Declaration of snprintf. The header stdio.h is not included because it
+ * includes conflicting symbols on some platforms. */
+extern int snprintf( char * s,
+                     size_t n,
+                     const char * format,
+                     ... );
+
+/*-----------------------------------------------------------*/
+
+clock_t clock( void )
+{
+    /* This function is currently unsupported. It will always return -1. */
+
+    return ( clock_t ) -1;
+}
+
+/*-----------------------------------------------------------*/
+
+int clock_getcpuclockid( pid_t pid,
+                         clockid_t * clock_id )
+{
+    /* Silence warnings about unused parameters. */
+    ( void ) pid;
+    ( void ) clock_id;
+
+    /* This function is currently unsupported. It will always return EPERM. */
+    return EPERM;
+}
+
+/*-----------------------------------------------------------*/
+
+int clock_getres( clockid_t clock_id,
+                  struct timespec * res )
+{
+    /* Silence warnings about unused parameters. */
+    ( void ) clock_id;
+
+    /* Convert FreeRTOS tick resolution as timespec. */
+    if( res != NULL )
+    {
+        res->tv_sec = 0;
+        res->tv_nsec = NANOSECONDS_PER_TICK;
+    }
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int clock_gettime( clockid_t clock_id,
+                   struct timespec * tp )
+{
+    TimeOut_t xCurrentTime = { 0 };
+
+    /* Intermediate variable used to convert TimeOut_t to struct timespec.
+     * Also used to detect overflow issues. It must be unsigned because the
+     * behavior of signed integer overflow is undefined. */
+    uint64_t ullTickCount = 0ULL;
+
+    /* Silence warnings about unused parameters. */
+    ( void ) clock_id;
+
+    /* Get the current tick count and overflow count. vTaskSetTimeOutState()
+     * is used to get these values because they are both static in tasks.c. */
+    vTaskSetTimeOutState( &xCurrentTime );
+
+    /* Adjust the tick count for the number of times a TickType_t has overflowed.
+     * portMAX_DELAY should be the maximum value of a TickType_t. */
+    ullTickCount = ( uint64_t ) ( xCurrentTime.xOverflowCount ) << ( sizeof( TickType_t ) * 8 );
+
+    /* Add the current tick count. */
+    ullTickCount += xCurrentTime.xTimeOnEntering;
+
+    /* Convert ullTickCount to timespec. */
+    UTILS_NanosecondsToTimespec( ( int64_t ) ullTickCount * NANOSECONDS_PER_TICK, tp );
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int clock_nanosleep( clockid_t clock_id,
+                     int flags,
+                     const struct timespec * rqtp,
+                     struct timespec * rmtp )
+{
+    int iStatus = 0;
+    TickType_t xSleepTime = 0;
+    struct timespec xCurrentTime = { 0 };
+
+    /* Silence warnings about unused parameters. */
+    ( void ) clock_id;
+    ( void ) rmtp;
+    ( void ) flags; /* This is only ignored if INCLUDE_vTaskDelayUntil is 0. */
+
+    /* Check rqtp. */
+    if( UTILS_ValidateTimespec( rqtp ) == false )
+    {
+        iStatus = EINVAL;
+    }
+
+    /* Get current time */
+    if( ( iStatus == 0 ) && ( clock_gettime( CLOCK_REALTIME, &xCurrentTime ) != 0 ) )
+    {
+        iStatus = EINVAL;
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Check for absolute time sleep. */
+        if( ( flags & TIMER_ABSTIME ) == TIMER_ABSTIME )
+        {
+            /* Get current time */
+            if( clock_gettime( CLOCK_REALTIME, &xCurrentTime ) != 0 )
+            {
+                iStatus = EINVAL;
+            }
+
+            /* Get number of ticks until absolute time. */
+            if( ( iStatus == 0 ) && ( UTILS_AbsoluteTimespecToDeltaTicks( rqtp, &xCurrentTime, &xSleepTime ) == 0 ) )
+            {
+                /* Delay until absolute time if vTaskDelayUntil is available. */
+                #if ( INCLUDE_vTaskDelayUntil == 1 )
+
+                    /* Get the current tick count. This variable isn't declared
+                     * at the top of the function because it's only used and needed
+                     * if vTaskDelayUntil is available. */
+                    TickType_t xCurrentTicks = xTaskGetTickCount();
+
+                    /* Delay until absolute time. */
+                    vTaskDelayUntil( &xCurrentTicks, xSleepTime );
+                #else
+
+                    /* If vTaskDelayUntil isn't available, ignore the TIMER_ABSTIME flag
+                     * and sleep for a relative time. */
+                    vTaskDelay( xSleepTime );
+                #endif
+            }
+        }
+        else
+        {
+            /* If TIMER_ABSTIME isn't specified, convert rqtp to ticks and
+             * sleep for a relative time. */
+            if( UTILS_TimespecToTicks( rqtp, &xSleepTime ) == 0 )
+            {
+                vTaskDelay( xSleepTime );
+            }
+        }
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int clock_settime( clockid_t clock_id,
+                   const struct timespec * tp )
+{
+    /* Silence warnings about unused parameters. */
+    ( void ) clock_id;
+    ( void ) tp;
+
+    /* This function is currently unsupported. It will always return -1 and
+     * set errno to EPERM. */
+    errno = EPERM;
+
+    return -1;
+}
+
+/*-----------------------------------------------------------*/
+
+int nanosleep( const struct timespec * rqtp,
+               struct timespec * rmtp )
+{
+    int iStatus = 0;
+    TickType_t xSleepTime = 0;
+
+    /* Silence warnings about unused parameters. */
+    ( void ) rmtp;
+
+    /* Check rqtp. */
+    if( UTILS_ValidateTimespec( rqtp ) == false )
+    {
+        errno = EINVAL;
+        iStatus = -1;
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Convert rqtp to ticks and delay. */
+        if( UTILS_TimespecToTicks( rqtp, &xSleepTime ) == 0 )
+        {
+            vTaskDelay( xSleepTime );
+        }
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_mqueue.c

@@ -0,0 +1,893 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_mqueue.c
+ * @brief Implementation of message queue functions in mqueue.h
+ */
+
+/* C standard library includes. */
+#include <string.h>
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX.h"
+#include "FreeRTOS_POSIX/errno.h"
+#include "FreeRTOS_POSIX/fcntl.h"
+#include "FreeRTOS_POSIX/mqueue.h"
+#include "FreeRTOS_POSIX/utils.h"
+
+/**
+ * @brief Element of the FreeRTOS queues that store mq data.
+ */
+typedef struct QueueElement
+{
+    char * pcData;    /**< Data in queue. Type char* to match msg_ptr. */
+    size_t xDataSize; /**< Size of data pointed by pcData. */
+} QueueElement_t;
+
+/**
+ * @brief Data structure of an mq.
+ *
+ * FreeRTOS isn't guaranteed to have a file-like abstraction, so message
+ * queues in this implementation are stored as a linked list (in RAM).
+ */
+typedef struct QueueListElement
+{
+    Link_t xLink;              /**< Pointer to the next element in the list. */
+    QueueHandle_t xQueue;      /**< FreeRTOS queue handle. */
+    size_t xOpenDescriptors;   /**< Number of threads that have opened this queue. */
+    char * pcName;             /**< Null-terminated queue name. */
+    struct mq_attr xAttr;      /**< Queue attibutes. */
+    BaseType_t xPendingUnlink; /**< If pdTRUE, this queue will be unlinked once all descriptors close. */
+} QueueListElement_t;
+
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Convert an absolute timespec into a tick timeout, taking into account
+ * queue flags.
+ *
+ * @param[in] lMessageQueueFlags Message queue flags to consider.
+ * @param[in] pxAbsoluteTimeout The absolute timespec to convert.
+ * @param[out] pxTimeoutTicks Output parameter of the timeout in ticks.
+ *
+ * @return 0 if successful; EINVAL if pxAbsoluteTimeout is invalid, or ETIMEDOUT
+ * if pxAbsoluteTimeout is in the past.
+ */
+static int prvCalculateTickTimeout( long lMessageQueueFlags,
+                                    const struct timespec * const pxAbsoluteTimeout,
+                                    TickType_t * pxTimeoutTicks );
+
+/**
+ * @brief Add a new queue to the queue list.
+ *
+ * @param[out] ppxMessageQueue Pointer to new queue.
+ * @param[in] pxAttr mq_attr of the new queue.
+ * @param[in] pcName Name of new queue.
+ * @param[in] xNameLength Length of pcName.
+ *
+ * @return pdTRUE if the queue is found; pdFALSE otherwise.
+ */
+static BaseType_t prvCreateNewMessageQueue( QueueListElement_t ** ppxMessageQueue,
+                                            const struct mq_attr * const pxAttr,
+                                            const char * const pcName,
+                                            size_t xNameLength );
+
+/**
+ * @brief Free all the resources used by a message queue.
+ *
+ * @param[out] pxMessageQueue Pointer to queue to free.
+ *
+ * @return nothing
+ */
+static void prvDeleteMessageQueue( const QueueListElement_t * const pxMessageQueue );
+
+/**
+ * @brief Attempt to find the queue identified by pcName or xMqId in the queue list.
+ *
+ * Matches queues by pcName first; if pcName is NULL, matches by xMqId.
+ * @param[out] ppxQueueListElement Output parameter set when queue is found.
+ * @param[in] pcName A queue name to match.
+ * @param[in] xMessageQueueDescriptor A queue descriptor to match.
+ *
+ * @return pdTRUE if the queue is found; pdFALSE otherwise.
+ */
+static BaseType_t prvFindQueueInList( QueueListElement_t ** const ppxQueueListElement,
+                                      const char * const pcName,
+                                      mqd_t xMessageQueueDescriptor );
+
+/**
+ * @brief Initialize the queue list.
+ *
+ * Performs initialization of the queue list mutex and queue list head.
+ *
+ * @return nothing
+ */
+static void prvInitializeQueueList( void );
+
+/**
+ * @brief Checks that pcName is a valid name for a message queue.
+ *
+ * Also outputs the length of pcName.
+ * @param[in] pcName The name to check.
+ * @param[out] pxNameLength Output parameter for name length.
+ *
+ * @return pdTRUE if the name is valid; pdFALSE otherwise.
+ */
+static BaseType_t prvValidateQueueName( const char * const pcName,
+                                        size_t * pxNameLength );
+
+/**
+ * @brief Guards access to the list of message queues.
+ */
+static StaticSemaphore_t xQueueListMutex = { { 0 }, .u = { 0 } };
+
+/**
+ * @brief Head of the linked list of queues.
+ */
+static Link_t xQueueListHead = { 0 };
+
+/*-----------------------------------------------------------*/
+
+static int prvCalculateTickTimeout( long lMessageQueueFlags,
+                                    const struct timespec * const pxAbsoluteTimeout,
+                                    TickType_t * pxTimeoutTicks )
+{
+    int iStatus = 0;
+
+    /* Check for nonblocking queue. */
+    if( lMessageQueueFlags & O_NONBLOCK )
+    {
+        /* No additional checks are done for nonblocking queues. Timeout is 0. */
+        *pxTimeoutTicks = 0;
+    }
+    else
+    {
+        /* No absolute timeout given. Block forever. */
+        if( pxAbsoluteTimeout == NULL )
+        {
+            *pxTimeoutTicks = portMAX_DELAY;
+        }
+        else
+        {
+            struct timespec xCurrentTime = { 0 };
+
+            /* Check that the given timespec is valid. */
+            if( UTILS_ValidateTimespec( pxAbsoluteTimeout ) == false )
+            {
+                iStatus = EINVAL;
+            }
+
+            /* Get current time */
+            if( ( iStatus == 0 ) && ( clock_gettime( CLOCK_REALTIME, &xCurrentTime ) != 0 ) )
+            {
+                iStatus = EINVAL;
+            }
+
+            /* Convert absolute timespec to ticks. */
+            if( ( iStatus == 0 ) &&
+                ( UTILS_AbsoluteTimespecToDeltaTicks( pxAbsoluteTimeout, &xCurrentTime, pxTimeoutTicks ) != 0 ) )
+            {
+                iStatus = ETIMEDOUT;
+            }
+        }
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+static BaseType_t prvCreateNewMessageQueue( QueueListElement_t ** ppxMessageQueue,
+                                            const struct mq_attr * const pxAttr,
+                                            const char * const pcName,
+                                            size_t xNameLength )
+{
+    BaseType_t xStatus = pdTRUE;
+
+    /* Allocate space for a new queue element. */
+    *ppxMessageQueue = pvPortMalloc( sizeof( QueueListElement_t ) );
+
+    /* Check that memory allocation succeeded. */
+    if( *ppxMessageQueue == NULL )
+    {
+        xStatus = pdFALSE;
+    }
+
+    /* Create the FreeRTOS queue. */
+    if( xStatus == pdTRUE )
+    {
+        ( *ppxMessageQueue )->xQueue =
+            xQueueCreate( pxAttr->mq_maxmsg, sizeof( QueueElement_t ) );
+
+        /* Check that queue creation succeeded. */
+        if( ( *ppxMessageQueue )->xQueue == NULL )
+        {
+            vPortFree( *ppxMessageQueue );
+            xStatus = pdFALSE;
+        }
+    }
+
+    if( xStatus == pdTRUE )
+    {
+        /* Allocate space for the queue name plus null-terminator. */
+        ( *ppxMessageQueue )->pcName = pvPortMalloc( xNameLength + 1 );
+
+        /* Check that memory was successfully allocated for queue name. */
+        if( ( *ppxMessageQueue )->pcName == NULL )
+        {
+            vQueueDelete( ( *ppxMessageQueue )->xQueue );
+            vPortFree( *ppxMessageQueue );
+            xStatus = pdFALSE;
+        }
+        else
+        {
+            /* Copy queue name. Copying xNameLength+1 will cause strncpy to add
+             * the null-terminator. */
+            ( void ) strncpy( ( *ppxMessageQueue )->pcName, pcName, xNameLength + 1 );
+        }
+    }
+
+    if( xStatus == pdTRUE )
+    {
+        /* Copy attributes. */
+        ( *ppxMessageQueue )->xAttr = *pxAttr;
+
+        /* A newly-created queue will have 1 open descriptor for it. */
+        ( *ppxMessageQueue )->xOpenDescriptors = 1;
+
+        /* A newly-created queue will not be pending unlink. */
+        ( *ppxMessageQueue )->xPendingUnlink = pdFALSE;
+
+        /* Add the new queue to the list. */
+        listADD( &xQueueListHead, &( *ppxMessageQueue )->xLink );
+    }
+
+    return xStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+static void prvDeleteMessageQueue( const QueueListElement_t * const pxMessageQueue )
+{
+    QueueElement_t xQueueElement = { 0 };
+
+    /* Free all data in the queue. It's assumed that no more data will be added
+     * to the queue, so xQueueReceive does not block. */
+    while( xQueueReceive( pxMessageQueue->xQueue,
+                          ( void * ) &xQueueElement,
+                          0 ) == pdTRUE )
+    {
+        vPortFree( xQueueElement.pcData );
+    }
+
+    /* Free memory used by this message queue. */
+    vQueueDelete( pxMessageQueue->xQueue );
+    vPortFree( ( void * ) pxMessageQueue->pcName );
+    vPortFree( ( void * ) pxMessageQueue );
+}
+
+/*-----------------------------------------------------------*/
+
+static BaseType_t prvFindQueueInList( QueueListElement_t ** const ppxQueueListElement,
+                                      const char * const pcName,
+                                      mqd_t xMessageQueueDescriptor )
+{
+    Link_t * pxQueueListLink = NULL;
+    QueueListElement_t * pxMessageQueue = NULL;
+    BaseType_t xQueueFound = pdFALSE;
+
+    /* Iterate through the list of queues. */
+    listFOR_EACH( pxQueueListLink, &xQueueListHead )
+    {
+        pxMessageQueue = listCONTAINER( pxQueueListLink, QueueListElement_t, xLink );
+
+        /* Match by name first if provided. */
+        if( ( pcName != NULL ) && ( strcmp( pxMessageQueue->pcName, pcName ) == 0 ) )
+        {
+            xQueueFound = pdTRUE;
+            break;
+        }
+        /* If name doesn't match, match by descriptor. */
+        else
+        {
+            if( ( mqd_t ) pxMessageQueue == xMessageQueueDescriptor )
+            {
+                xQueueFound = pdTRUE;
+                break;
+            }
+        }
+    }
+
+    /* If the queue was found, set the output parameter. */
+    if( ( xQueueFound == pdTRUE ) && ( ppxQueueListElement != NULL ) )
+    {
+        *ppxQueueListElement = pxMessageQueue;
+    }
+
+    return xQueueFound;
+}
+
+/*-----------------------------------------------------------*/
+
+static void prvInitializeQueueList( void )
+{
+    /* Keep track of whether the queue list has been initialized. */
+    static BaseType_t xQueueListInitialized = pdFALSE;
+
+    /* Check if queue list needs to be initialized. */
+    if( xQueueListInitialized == pdFALSE )
+    {
+        /* Initialization must be in a critical section to prevent two threads
+         * from initializing at the same time. */
+        taskENTER_CRITICAL();
+
+        /* Check again that queue list is still uninitialized, i.e. it wasn't
+         * initialized while this function was waiting to enter the critical
+         * section. */
+        if( xQueueListInitialized == pdFALSE )
+        {
+            /* Initialize the queue list mutex and list head. */
+            ( void ) xSemaphoreCreateMutexStatic( &xQueueListMutex );
+            listINIT_HEAD( &xQueueListHead );
+            xQueueListInitialized = pdTRUE;
+        }
+
+        /* Exit the critical section. */
+        taskEXIT_CRITICAL();
+    }
+}
+
+/*-----------------------------------------------------------*/
+
+static BaseType_t prvValidateQueueName( const char * const pcName,
+                                        size_t * pxNameLength )
+{
+    BaseType_t xStatus = pdTRUE;
+    size_t xNameLength = 0;
+
+    /* All message queue names must start with '/'. */
+    if( pcName[ 0 ] != '/' )
+    {
+        xStatus = pdFALSE;
+    }
+    else
+    {
+        /* Get the length of pcName, excluding the first '/' and null-terminator. */
+        xNameLength = UTILS_strnlen( pcName, NAME_MAX + 2 );
+
+        if( xNameLength == NAME_MAX + 2 )
+        {
+            /* Name too long. */
+            xStatus = pdFALSE;
+        }
+        else
+        {
+            /* Name length passes, set output parameter. */
+            *pxNameLength = xNameLength;
+        }
+    }
+
+    return xStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int mq_close( mqd_t mqdes )
+{
+    int iStatus = 0;
+    QueueListElement_t * pxMessageQueue = ( QueueListElement_t * ) mqdes;
+    BaseType_t xQueueRemoved = pdFALSE;
+
+    /* Initialize the queue list, if needed. */
+    prvInitializeQueueList();
+
+    /* Lock the mutex that guards access to the queue list. This call will
+     * never fail because it blocks forever. */
+    ( void ) xSemaphoreTake( ( SemaphoreHandle_t ) &xQueueListMutex, portMAX_DELAY );
+
+    /* Attempt to find the message queue based on the given descriptor. */
+    if( prvFindQueueInList( NULL, NULL, mqdes ) == pdTRUE )
+    {
+        /* Decrement the number of open descriptors. */
+        if( pxMessageQueue->xOpenDescriptors > 0 )
+        {
+            pxMessageQueue->xOpenDescriptors--;
+        }
+
+        /* Check if the queue has any more open descriptors. */
+        if( pxMessageQueue->xOpenDescriptors == 0 )
+        {
+            /* If no open descriptors remain and mq_unlink has already been called,
+             * remove the queue. */
+            if( pxMessageQueue->xPendingUnlink == pdTRUE )
+            {
+                listREMOVE( &pxMessageQueue->xLink );
+
+                /* Set the flag to delete the queue. Deleting the queue is deferred
+                 * until xQueueListMutex is released. */
+                xQueueRemoved = pdTRUE;
+            }
+            /* Otherwise, wait for the call to mq_unlink. */
+            else
+            {
+                pxMessageQueue->xPendingUnlink = pdTRUE;
+            }
+        }
+    }
+    else
+    {
+        /* Queue not found; bad descriptor. */
+        errno = EBADF;
+        iStatus = -1;
+    }
+
+    /* Release the mutex protecting the queue list. */
+    ( void ) xSemaphoreGive( ( SemaphoreHandle_t ) &xQueueListMutex );
+
+    /* Delete all resources used by the queue if needed. */
+    if( xQueueRemoved == pdTRUE )
+    {
+        prvDeleteMessageQueue( pxMessageQueue );
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int mq_getattr( mqd_t mqdes,
+                struct mq_attr * mqstat )
+{
+    int iStatus = 0;
+    QueueListElement_t * pxMessageQueue = ( QueueListElement_t * ) mqdes;
+
+    /* Lock the mutex that guards access to the queue list. This call will
+     * never fail because it blocks forever. */
+    ( void ) xSemaphoreTake( ( SemaphoreHandle_t ) &xQueueListMutex, portMAX_DELAY );
+
+    /* Find the mq referenced by mqdes. */
+    if( prvFindQueueInList( NULL, NULL, mqdes ) == pdTRUE )
+    {
+        /* Update the number of messages in the queue and copy the attributes
+         * into mqstat. */
+        pxMessageQueue->xAttr.mq_curmsgs = ( long ) uxQueueMessagesWaiting( pxMessageQueue->xQueue );
+        *mqstat = pxMessageQueue->xAttr;
+    }
+    else
+    {
+        /* Queue not found; bad descriptor. */
+        errno = EBADF;
+        iStatus = -1;
+    }
+
+    /* Release the mutex protecting the queue list. */
+    ( void ) xSemaphoreGive( ( SemaphoreHandle_t ) &xQueueListMutex );
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+mqd_t mq_open( const char * name,
+               int oflag,
+               mode_t mode,
+               struct mq_attr * attr )
+{
+    mqd_t xMessageQueue = NULL;
+    size_t xNameLength = 0;
+
+    /* Default mq_attr. */
+    struct mq_attr xQueueCreationAttr =
+    {
+        .mq_flags   = 0,
+        .mq_maxmsg  = posixconfigMQ_MAX_MESSAGES,
+        .mq_msgsize = posixconfigMQ_MAX_SIZE,
+        .mq_curmsgs = 0
+    };
+
+    /* Silence warnings about unused parameters. */
+    ( void ) mode;
+
+    /* Initialize the queue list, if needed. */
+    prvInitializeQueueList();
+
+    /* Check queue name. */
+    if( prvValidateQueueName( name, &xNameLength ) == pdFALSE )
+    {
+        /* Invalid name. */
+        errno = EINVAL;
+        xMessageQueue = ( mqd_t ) -1;
+    }
+
+    /* Check attributes, if given. */
+    if( xMessageQueue == NULL )
+    {
+        if( ( oflag & O_CREAT ) && ( attr != NULL ) && ( ( attr->mq_maxmsg <= 0 ) || ( attr->mq_msgsize <= 0 ) ) )
+        {
+            /* Invalid mq_attr.mq_maxmsg or mq_attr.mq_msgsize. */
+            errno = EINVAL;
+            xMessageQueue = ( mqd_t ) -1;
+        }
+    }
+
+    if( xMessageQueue == NULL )
+    {
+        /* Lock the mutex that guards access to the queue list. This call will
+         * never fail because it blocks forever. */
+        ( void ) xSemaphoreTake( ( SemaphoreHandle_t ) &xQueueListMutex, portMAX_DELAY );
+
+        /* Search the queue list to check if the queue exists. */
+        if( prvFindQueueInList( ( QueueListElement_t ** ) &xMessageQueue,
+                                name,
+                                ( mqd_t ) NULL ) == pdTRUE )
+        {
+            /* If the mq exists, check that this function wasn't called with
+             * O_CREAT and O_EXCL. */
+            if( ( oflag & O_EXCL ) && ( oflag & O_CREAT ) )
+            {
+                errno = EEXIST;
+                xMessageQueue = ( mqd_t ) -1;
+            }
+            else
+            {
+                /* Check if the mq has been unlinked and is pending removal. */
+                if( ( ( QueueListElement_t * ) xMessageQueue )->xPendingUnlink == pdTRUE )
+                {
+                    /* Queue pending deletion. Don't allow it to be re-opened. */
+                    errno = EINVAL;
+                    xMessageQueue = ( mqd_t ) -1;
+                }
+                else
+                {
+                    /* Increase count of open file descriptors for queue. */
+                    ( ( QueueListElement_t * ) xMessageQueue )->xOpenDescriptors++;
+                }
+            }
+        }
+        /* Queue does not exist. */
+        else
+        {
+            /* Only create the new queue if O_CREAT was specified. */
+            if( oflag & O_CREAT )
+            {
+                /* Copy attributes if provided. */
+                if( attr != NULL )
+                {
+                    xQueueCreationAttr = *attr;
+                }
+
+                /* Copy oflags. */
+                xQueueCreationAttr.mq_flags = ( long ) oflag;
+
+                /* Create the new message queue. */
+                if( prvCreateNewMessageQueue( ( QueueListElement_t ** ) &xMessageQueue,
+                                              &xQueueCreationAttr,
+                                              name,
+                                              xNameLength ) == pdFALSE )
+                {
+                    errno = ENOSPC;
+                    xMessageQueue = ( mqd_t ) -1;
+                }
+            }
+            else
+            {
+                errno = ENOENT;
+                xMessageQueue = ( mqd_t ) -1;
+            }
+        }
+
+        /* Release the mutex protecting the queue list. */
+        ( void ) xSemaphoreGive( ( SemaphoreHandle_t ) &xQueueListMutex );
+    }
+
+    return xMessageQueue;
+}
+
+/*-----------------------------------------------------------*/
+
+ssize_t mq_receive( mqd_t mqdes,
+                    char * msg_ptr,
+                    size_t msg_len,
+                    unsigned int * msg_prio )
+{
+    return mq_timedreceive( mqdes, msg_ptr, msg_len, msg_prio, NULL );
+}
+
+/*-----------------------------------------------------------*/
+
+int mq_send( mqd_t mqdes,
+             const char * msg_ptr,
+             size_t msg_len,
+             unsigned msg_prio )
+{
+    return mq_timedsend( mqdes, msg_ptr, msg_len, msg_prio, NULL );
+}
+
+/*-----------------------------------------------------------*/
+
+ssize_t mq_timedreceive( mqd_t mqdes,
+                         char * msg_ptr,
+                         size_t msg_len,
+                         unsigned * msg_prio,
+                         const struct timespec * abstime )
+{
+    ssize_t xStatus = 0;
+    int iCalculateTimeoutReturn = 0;
+    TickType_t xTimeoutTicks = 0;
+    QueueListElement_t * pxMessageQueue = ( QueueListElement_t * ) mqdes;
+    QueueElement_t xReceiveData = { 0 };
+
+    /* Silence warnings about unused parameters. */
+    ( void ) msg_prio;
+
+    /* Lock the mutex that guards access to the queue list. This call will
+     * never fail because it blocks forever. */
+    ( void ) xSemaphoreTake( ( SemaphoreHandle_t ) &xQueueListMutex, portMAX_DELAY );
+
+    /* Find the mq referenced by mqdes. */
+    if( prvFindQueueInList( NULL, NULL, mqdes ) == pdFALSE )
+    {
+        /* Queue not found; bad descriptor. */
+        errno = EBADF;
+        xStatus = -1;
+    }
+
+    /* Verify that msg_len is large enough. */
+    if( xStatus == 0 )
+    {
+        if( msg_len < ( size_t ) pxMessageQueue->xAttr.mq_msgsize )
+        {
+            /* msg_len too small. */
+            errno = EMSGSIZE;
+            xStatus = -1;
+        }
+    }
+
+    if( xStatus == 0 )
+    {
+        /* Convert abstime to a tick timeout. */
+        iCalculateTimeoutReturn = prvCalculateTickTimeout( pxMessageQueue->xAttr.mq_flags,
+                                                           abstime,
+                                                           &xTimeoutTicks );
+
+        if( iCalculateTimeoutReturn != 0 )
+        {
+            errno = iCalculateTimeoutReturn;
+            xStatus = -1;
+        }
+    }
+
+    /* Release the mutex protecting the queue list. */
+    ( void ) xSemaphoreGive( ( SemaphoreHandle_t ) &xQueueListMutex );
+
+    if( xStatus == 0 )
+    {
+        /* Receive data from the FreeRTOS queue. */
+        if( xQueueReceive( pxMessageQueue->xQueue,
+                           &xReceiveData,
+                           xTimeoutTicks ) == pdFALSE )
+        {
+            /* If queue receive fails, set the appropriate errno. */
+            if( pxMessageQueue->xAttr.mq_flags & O_NONBLOCK )
+            {
+                /* Set errno to EAGAIN for nonblocking mq. */
+                errno = EAGAIN;
+            }
+            else
+            {
+                /* Otherwise, set errno to ETIMEDOUT. */
+                errno = ETIMEDOUT;
+            }
+
+            xStatus = -1;
+        }
+    }
+
+    if( xStatus == 0 )
+    {
+        /* Get the length of data for return value. */
+        xStatus = ( ssize_t ) xReceiveData.xDataSize;
+
+        /* Copy received data into given buffer, then free it. */
+        ( void ) memcpy( msg_ptr, xReceiveData.pcData, xReceiveData.xDataSize );
+        vPortFree( xReceiveData.pcData );
+    }
+
+    return xStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int mq_timedsend( mqd_t mqdes,
+                  const char * msg_ptr,
+                  size_t msg_len,
+                  unsigned int msg_prio,
+                  const struct timespec * abstime )
+{
+    int iStatus = 0, iCalculateTimeoutReturn = 0;
+    TickType_t xTimeoutTicks = 0;
+    QueueListElement_t * pxMessageQueue = ( QueueListElement_t * ) mqdes;
+    QueueElement_t xSendData = { 0 };
+
+    /* Silence warnings about unused parameters. */
+    ( void ) msg_prio;
+
+    /* Lock the mutex that guards access to the queue list. This call will
+     * never fail because it blocks forever. */
+    ( void ) xSemaphoreTake( ( SemaphoreHandle_t ) &xQueueListMutex, portMAX_DELAY );
+
+    /* Find the mq referenced by mqdes. */
+    if( prvFindQueueInList( NULL, NULL, mqdes ) == pdFALSE )
+    {
+        /* Queue not found; bad descriptor. */
+        errno = EBADF;
+        iStatus = -1;
+    }
+
+    /* Verify that mq_msgsize is large enough. */
+    if( iStatus == 0 )
+    {
+        if( msg_len > ( size_t ) pxMessageQueue->xAttr.mq_msgsize )
+        {
+            /* msg_len too large. */
+            errno = EMSGSIZE;
+            iStatus = -1;
+        }
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Convert abstime to a tick timeout. */
+        iCalculateTimeoutReturn = prvCalculateTickTimeout( pxMessageQueue->xAttr.mq_flags,
+                                                           abstime,
+                                                           &xTimeoutTicks );
+
+        if( iCalculateTimeoutReturn != 0 )
+        {
+            errno = iCalculateTimeoutReturn;
+            iStatus = -1;
+        }
+    }
+
+    /* Release the mutex protecting the queue list. */
+    ( void ) xSemaphoreGive( ( SemaphoreHandle_t ) &xQueueListMutex );
+
+    /* Allocate memory for the message. */
+    if( iStatus == 0 )
+    {
+        xSendData.xDataSize = msg_len;
+        xSendData.pcData = pvPortMalloc( msg_len );
+
+        /* Check that memory allocation succeeded. */
+        if( xSendData.pcData == NULL )
+        {
+            /* msg_len too large. */
+            errno = EMSGSIZE;
+            iStatus = -1;
+        }
+        else
+        {
+            /* Copy the data to send. */
+            ( void ) memcpy( xSendData.pcData, msg_ptr, msg_len );
+        }
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Send data to the FreeRTOS queue. */
+        if( xQueueSend( pxMessageQueue->xQueue,
+                        &xSendData,
+                        xTimeoutTicks ) == pdFALSE )
+        {
+            /* If queue send fails, set the appropriate errno. */
+            if( pxMessageQueue->xAttr.mq_flags & O_NONBLOCK )
+            {
+                /* Set errno to EAGAIN for nonblocking mq. */
+                errno = EAGAIN;
+            }
+            else
+            {
+                /* Otherwise, set errno to ETIMEDOUT. */
+                errno = ETIMEDOUT;
+            }
+
+            /* Free the allocated queue data. */
+            vPortFree( xSendData.pcData );
+
+            iStatus = -1;
+        }
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int mq_unlink( const char * name )
+{
+    int iStatus = 0;
+    size_t xNameSize = 0;
+    BaseType_t xQueueRemoved = pdFALSE;
+    QueueListElement_t * pxMessageQueue = NULL;
+
+    /* Initialize the queue list, if needed. */
+    prvInitializeQueueList();
+
+    /* Check queue name. */
+    if( prvValidateQueueName( name, &xNameSize ) == pdFALSE )
+    {
+        /* Error with mq name. */
+        errno = EINVAL;
+        iStatus = -1;
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Lock the mutex that guards access to the queue list. This call will
+         * never fail because it blocks forever. */
+        ( void ) xSemaphoreTake( ( SemaphoreHandle_t ) &xQueueListMutex, portMAX_DELAY );
+
+        /* Check if the named queue exists. */
+        if( prvFindQueueInList( &pxMessageQueue, name, ( mqd_t ) NULL ) == pdTRUE )
+        {
+            /* If the queue exists and there are no open descriptors to it,
+             * remove it from the list. */
+            if( pxMessageQueue->xOpenDescriptors == 0 )
+            {
+                listREMOVE( &pxMessageQueue->xLink );
+
+                /* Set the flag to delete the queue. Deleting the queue is deferred
+                 * until xQueueListMutex is released. */
+                xQueueRemoved = pdTRUE;
+            }
+            else
+            {
+                /* If the queue has open descriptors, set the pending unlink flag
+                 * so that mq_close will free its resources. */
+                pxMessageQueue->xPendingUnlink = pdTRUE;
+            }
+        }
+        else
+        {
+            /* The named message queue doesn't exist. */
+            errno = ENOENT;
+            iStatus = -1;
+        }
+
+        /* Release the mutex protecting the queue list. */
+        ( void ) xSemaphoreGive( ( SemaphoreHandle_t ) &xQueueListMutex );
+    }
+
+    /* Delete all resources used by the queue if needed. */
+    if( xQueueRemoved == pdTRUE )
+    {
+        prvDeleteMessageQueue( pxMessageQueue );
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_pthread.c

@@ -0,0 +1,510 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_pthread.c
+ * @brief Implementation of thread functions in pthread.h
+ */
+
+/* C standard library includes. */
+#include <stddef.h>
+#include <string.h>
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX.h"
+#include "FreeRTOS_POSIX/errno.h"
+#include "FreeRTOS_POSIX/pthread.h"
+
+/**
+ * @brief Thread attribute object.
+ */
+typedef struct pthread_attr_internal
+{
+    uint16_t usStackSize;                /**< Stack size. */
+    uint16_t usSchedPriorityDetachState; /**< Schedule priority 15 bits (LSB) Detach state: 1 bits (MSB) */
+} pthread_attr_internal_t;
+
+#define pthreadDETACH_STATE_MASK      0x8000
+#define pthreadSCHED_PRIORITY_MASK    0x7FFF
+#define pthreadDETACH_STATE_SHIFT     15
+#define pthreadGET_SCHED_PRIORITY( var )    ( ( var ) & ( pthreadSCHED_PRIORITY_MASK ) )
+#define pthreadIS_JOINABLE( var )           ( ( ( var ) & ( pthreadDETACH_STATE_MASK ) ) == pthreadDETACH_STATE_MASK )
+
+/**
+ * @brief Thread object.
+ */
+typedef struct pthread_internal
+{
+    pthread_attr_internal_t xAttr;        /**< Thread attributes. */
+    void * ( *pvStartRoutine )( void * ); /**< Application thread function. */
+    void * xTaskArg;                      /**< Arguments for application thread function. */
+    TaskHandle_t xTaskHandle;             /**< FreeRTOS task handle. */
+    StaticSemaphore_t xJoinBarrier;       /**< Synchronizes the two callers of pthread_join. */
+    StaticSemaphore_t xJoinMutex;         /**< Ensures that only one other thread may join this thread. */
+    void * xReturn;                       /**< Return value of pvStartRoutine. */
+} pthread_internal_t;
+
+/**
+ * @brief Terminates the calling thread.
+ *
+ * For joinable threads, this function waits for pthread_join. Otherwise,
+ * it deletes the thread and frees up resources used by the thread.
+ *
+ * @return This function does not return.
+ */
+static void prvExitThread( void );
+
+/**
+ * @brief Wrapper function for the user's thread routine.
+ *
+ * This function is executed as a FreeRTOS task function.
+ * @param[in] pxArg A pointer to a pthread_internal_t.
+ *
+ * @return nothing
+ */
+static void prvRunThread( void * pxArg );
+
+/**
+ * @brief Default pthread_attr_t.
+ */
+static const pthread_attr_internal_t xDefaultThreadAttributes =
+{
+    .usStackSize                = PTHREAD_STACK_MIN,
+    .usSchedPriorityDetachState = ( ( uint16_t ) tskIDLE_PRIORITY & pthreadSCHED_PRIORITY_MASK ) | ( PTHREAD_CREATE_JOINABLE << pthreadDETACH_STATE_SHIFT ),
+};
+
+/*-----------------------------------------------------------*/
+
+static void prvExitThread( void )
+{
+    pthread_internal_t * pxThread = ( pthread_internal_t * ) pthread_self();
+
+    /* If this thread is joinable, wait for a call to pthread_join. */
+    if( pthreadIS_JOINABLE( pxThread->xAttr.usSchedPriorityDetachState ) )
+    {
+        ( void ) xSemaphoreGive( ( SemaphoreHandle_t ) &pxThread->xJoinBarrier );
+
+        /* Suspend until the call to pthread_join. The caller of pthread_join
+         * will perform cleanup. */
+        vTaskSuspend( NULL );
+    }
+    else
+    {
+        /* For a detached thread, perform cleanup of thread object. */
+        vPortFree( pxThread );
+        vTaskDelete( NULL );
+    }
+}
+
+/*-----------------------------------------------------------*/
+
+static void prvRunThread( void * pxArg )
+{
+    pthread_internal_t * pxThread = ( pthread_internal_t * ) pxArg;
+
+    /* Run the thread routine. */
+    pxThread->xReturn = pxThread->pvStartRoutine( ( void * ) pxThread->xTaskArg );
+
+    /* Exit once finished. This function does not return. */
+    prvExitThread();
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_attr_destroy( pthread_attr_t * attr )
+{
+    ( void ) attr;
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_attr_getdetachstate( const pthread_attr_t * attr,
+                                 int * detachstate )
+{
+    pthread_attr_internal_t * pxAttr = ( pthread_attr_internal_t * ) ( attr );
+
+    if( pthreadIS_JOINABLE( pxAttr->usSchedPriorityDetachState ) )
+    {
+        *detachstate = PTHREAD_CREATE_JOINABLE;
+    }
+    else
+    {
+        *detachstate = PTHREAD_CREATE_DETACHED;
+    }
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_attr_getschedparam( const pthread_attr_t * attr,
+                                struct sched_param * param )
+{
+    pthread_attr_internal_t * pxAttr = ( pthread_attr_internal_t * ) ( attr );
+
+    param->sched_priority = ( int ) ( pthreadGET_SCHED_PRIORITY( pxAttr->usSchedPriorityDetachState ) );
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_attr_getstacksize( const pthread_attr_t * attr,
+                               size_t * stacksize )
+{
+    pthread_attr_internal_t * pxAttr = ( pthread_attr_internal_t * ) ( attr );
+
+    *stacksize = ( size_t ) pxAttr->usStackSize;
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_attr_init( pthread_attr_t * attr )
+{
+    /* Copy the default values into the new thread attributes object. */
+    *( ( pthread_attr_internal_t * ) ( attr ) ) = xDefaultThreadAttributes;
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_attr_setdetachstate( pthread_attr_t * attr,
+                                 int detachstate )
+{
+    int iStatus = 0;
+    pthread_attr_internal_t * pxAttr = ( pthread_attr_internal_t * ) ( attr );
+
+    if( ( detachstate != PTHREAD_CREATE_DETACHED ) && ( detachstate != PTHREAD_CREATE_JOINABLE ) )
+    {
+        iStatus = EINVAL;
+    }
+    else
+    {
+        /* clear and then set msb bit to detachstate) */
+        pxAttr->usSchedPriorityDetachState &= ~pthreadDETACH_STATE_MASK;
+        pxAttr->usSchedPriorityDetachState |= ( ( uint16_t ) detachstate << pthreadDETACH_STATE_SHIFT );
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_attr_setschedparam( pthread_attr_t * attr,
+                                const struct sched_param * param )
+{
+    int iStatus = 0;
+    pthread_attr_internal_t * pxAttr = ( pthread_attr_internal_t * ) ( attr );
+
+    /* Check for NULL param. */
+    if( param == NULL )
+    {
+        iStatus = EINVAL;
+    }
+
+    /* Ensure that param.sched_priority is valid. */
+    if( ( iStatus == 0 ) &&
+        ( ( param->sched_priority > sched_get_priority_max( SCHED_OTHER ) ) ||
+          ( param->sched_priority < 0 ) ) )
+    {
+        iStatus = ENOTSUP;
+    }
+
+    /* Set the sched_param. */
+    if( iStatus == 0 )
+    {
+        /* clear and then set  15 LSB to schedule priority) */
+        pxAttr->usSchedPriorityDetachState &= ~pthreadSCHED_PRIORITY_MASK;
+        pxAttr->usSchedPriorityDetachState |= ( ( uint16_t ) param->sched_priority );
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_attr_setschedpolicy( pthread_attr_t * attr,
+                                 int policy )
+{
+    /* Silence warnings about unused parameters. */
+    ( void ) attr;
+    ( void ) policy;
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_attr_setstacksize( pthread_attr_t * attr,
+                               size_t stacksize )
+{
+    int iStatus = 0;
+    pthread_attr_internal_t * pxAttr = ( pthread_attr_internal_t * ) ( attr );
+
+    if( stacksize < PTHREAD_STACK_MIN )
+    {
+        iStatus = EINVAL;
+    }
+    else
+    {
+        pxAttr->usStackSize = ( uint16_t ) stacksize;
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_create( pthread_t * thread,
+                    const pthread_attr_t * attr,
+                    void *( *startroutine )( void * ),
+                    void * arg )
+{
+    int iStatus = 0;
+    pthread_internal_t * pxThread = NULL;
+    struct sched_param xSchedParam = { .sched_priority = tskIDLE_PRIORITY };
+
+    /* Allocate memory for new thread object. */
+    pxThread = ( pthread_internal_t * ) pvPortMalloc( sizeof( pthread_internal_t ) );
+
+    if( pxThread == NULL )
+    {
+        /* No memory. */
+        iStatus = EAGAIN;
+    }
+
+    if( iStatus == 0 )
+    {
+        /* No attributes given, use default attributes. */
+        if( attr == NULL )
+        {
+            pxThread->xAttr = xDefaultThreadAttributes;
+        }
+        /* Otherwise, use provided attributes. */
+        else
+        {
+            pxThread->xAttr = *( ( pthread_attr_internal_t * ) ( attr ) );
+        }
+
+        /* Get priority from attributes */
+        xSchedParam.sched_priority = ( int ) pthreadGET_SCHED_PRIORITY( pxThread->xAttr.usSchedPriorityDetachState );
+
+        /* Set argument and start routine. */
+        pxThread->xTaskArg = arg;
+        pxThread->pvStartRoutine = startroutine;
+
+        /* If this thread is joinable, create the synchronization mechanisms for
+         * pthread_join. */
+
+        if( pthreadIS_JOINABLE( pxThread->xAttr.usSchedPriorityDetachState ) )
+        {
+            /* These calls will not fail when their arguments aren't NULL. */
+            ( void ) xSemaphoreCreateMutexStatic( &pxThread->xJoinMutex );
+            ( void ) xSemaphoreCreateBinaryStatic( &pxThread->xJoinBarrier );
+        }
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Suspend all tasks to create a critical section. This ensures that
+         * the new thread doesn't exit before a tag is assigned. */
+        vTaskSuspendAll();
+
+        /* Create the FreeRTOS task that will run the pthread. */
+        if( xTaskCreate( prvRunThread,
+                         posixconfigPTHREAD_TASK_NAME,
+                         ( uint16_t ) ( pxThread->xAttr.usStackSize / sizeof( StackType_t ) ),
+                         ( void * ) pxThread,
+                         xSchedParam.sched_priority,
+                         &pxThread->xTaskHandle ) != pdPASS )
+        {
+            /* Task creation failed, no memory. */
+            vPortFree( pxThread );
+            iStatus = EAGAIN;
+        }
+        else
+        {
+            /* Store the pointer to the thread object in the task tag. */
+            vTaskSetApplicationTaskTag( pxThread->xTaskHandle, ( TaskHookFunction_t ) pxThread );
+
+            /* Set the thread object for the user. */
+            *thread = ( pthread_t ) pxThread;
+        }
+
+        /* End the critical section. */
+        xTaskResumeAll();
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_getschedparam( pthread_t thread,
+                           int * policy,
+                           struct sched_param * param )
+{
+    int iStatus = 0;
+    pthread_internal_t * pxThread = ( pthread_internal_t * ) thread;
+
+    *policy = SCHED_OTHER;
+    param->sched_priority = ( int ) pthreadGET_SCHED_PRIORITY( pxThread->xAttr.usSchedPriorityDetachState );
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_equal( pthread_t t1,
+                   pthread_t t2 )
+{
+    return t1 == t2;
+}
+
+/*-----------------------------------------------------------*/
+
+void pthread_exit( void * value_ptr )
+{
+    pthread_internal_t * pxThread = ( pthread_internal_t * ) pthread_self();
+
+    /* Set the return value. */
+    pxThread->xReturn = value_ptr;
+
+    /* Exit this thread. */
+    prvExitThread();
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_join( pthread_t pthread,
+                  void ** retval )
+{
+    int iStatus = 0;
+    pthread_internal_t * pxThread = ( pthread_internal_t * ) pthread;
+
+    /* Make sure pthread is joinable. Otherwise, this function would block
+     * forever waiting for an unjoinable thread. */
+    if( !pthreadIS_JOINABLE( pxThread->xAttr.usSchedPriorityDetachState ) )
+    {
+        iStatus = EDEADLK;
+    }
+
+    /* Only one thread may attempt to join another. Lock the join mutex
+     * to prevent other threads from calling pthread_join on the same thread. */
+    if( iStatus == 0 )
+    {
+        if( xSemaphoreTake( ( SemaphoreHandle_t ) &pxThread->xJoinMutex, 0 ) != pdPASS )
+        {
+            /* Another thread has already joined the requested thread, which would
+             * cause this thread to wait forever. */
+            iStatus = EDEADLK;
+        }
+    }
+
+    /* Attempting to join the calling thread would cause a deadlock. */
+    if( iStatus == 0 )
+    {
+        if( pthread_equal( pthread_self(), pthread ) != 0 )
+        {
+            iStatus = EDEADLK;
+        }
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Wait for the joining thread to finish. Because this call waits forever,
+         * it should never fail. */
+        ( void ) xSemaphoreTake( ( SemaphoreHandle_t ) &pxThread->xJoinBarrier, portMAX_DELAY );
+
+        /* Create a critical section to clean up the joined thread. */
+        vTaskSuspendAll();
+
+        /* Release xJoinBarrier and delete it. */
+        ( void ) xSemaphoreGive( ( SemaphoreHandle_t ) &pxThread->xJoinBarrier );
+        vSemaphoreDelete( ( SemaphoreHandle_t ) &pxThread->xJoinBarrier );
+
+        /* Release xJoinMutex and delete it. */
+        ( void ) xSemaphoreGive( ( SemaphoreHandle_t ) &pxThread->xJoinMutex );
+        vSemaphoreDelete( ( SemaphoreHandle_t ) &pxThread->xJoinMutex );
+
+        /* Delete the FreeRTOS task that ran the thread. */
+        vTaskDelete( pxThread->xTaskHandle );
+
+        /* Set the return value. */
+        if( retval != NULL )
+        {
+            *retval = pxThread->xReturn;
+        }
+
+        /* Free the thread object. */
+        vPortFree( pxThread );
+
+        /* End the critical section. */
+        xTaskResumeAll();
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+pthread_t pthread_self( void )
+{
+    /* Return a reference to this pthread object, which is stored in the
+     * FreeRTOS task tag. */
+    return ( pthread_t ) xTaskGetApplicationTaskTag( NULL );
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_setschedparam( pthread_t thread,
+                           int policy,
+                           const struct sched_param * param )
+{
+    int iStatus = 0;
+
+    pthread_internal_t * pxThread = ( pthread_internal_t * ) thread;
+
+    /* Silence compiler warnings about unused parameters. */
+    ( void ) policy;
+
+    /* Copy the given sched_param. */
+    iStatus = pthread_attr_setschedparam( ( pthread_attr_t * ) &pxThread->xAttr, param );
+
+    if( iStatus == 0 )
+    {
+        /* Change the priority of the FreeRTOS task. */
+        vTaskPrioritySet( pxThread->xTaskHandle, param->sched_priority );
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_pthread_barrier.c

@@ -0,0 +1,167 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_pthread_barrier.c
+ * @brief Implementation of barrier functions in pthread.h
+ */
+
+/* C standard library includes. */
+#include <stddef.h>
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX.h"
+#include "FreeRTOS_POSIX/errno.h"
+#include "FreeRTOS_POSIX/pthread.h"
+
+#include "atomic.h"
+
+/*
+ * @brief barrier max count
+ *
+ * Barriers are implemented on FreeRTOS event groups, of which 8 bits are usable
+ * when configUSE_16_BIT_TICKS is 1. Otherwise, 24 bits are usable.
+ */
+/**@{ */
+#if ( configUSE_16_BIT_TICKS == 1 )
+    #define posixPTHREAD_BARRIER_MAX_COUNT    ( 8 )
+#else
+    #define posixPTHREAD_BARRIER_MAX_COUNT    ( 24 )
+#endif
+/**@} */
+
+/*-----------------------------------------------------------*/
+
+int pthread_barrier_destroy( pthread_barrier_t * barrier )
+{
+    pthread_barrier_internal_t * pxBarrier = ( pthread_barrier_internal_t * ) ( barrier );
+
+    /* Free all resources used by the barrier. */
+    ( void ) vEventGroupDelete( ( EventGroupHandle_t ) &pxBarrier->xBarrierEventGroup );
+    ( void ) vSemaphoreDelete( ( SemaphoreHandle_t ) &pxBarrier->xThreadCountSemaphore );
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_barrier_init( pthread_barrier_t * barrier,
+                          const pthread_barrierattr_t * attr,
+                          unsigned count )
+{
+    int iStatus = 0;
+    pthread_barrier_internal_t * pxNewBarrier = ( pthread_barrier_internal_t * ) ( barrier );
+
+    /* Silence warnings about unused parameters. */
+    ( void ) attr;
+
+    /* Ensure count is greater than 0. */
+    if( count == 0 )
+    {
+        iStatus = EINVAL;
+    }
+
+    /* Ensure that count will fit in a FreeRTOS event group. */
+    if( iStatus == 0 )
+    {
+        if( count > posixPTHREAD_BARRIER_MAX_COUNT )
+        {
+            /* No memory exists in the event group for more than
+             * posixPTHREAD_BARRIER_MAX_COUNT threads. */
+            iStatus = ENOMEM;
+        }
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Set the current thread count and threshold. */
+        pxNewBarrier->uThreadCount = 0;
+        pxNewBarrier->uThreshold = count;
+
+        /* Create the FreeRTOS event group. This call will not fail when its
+         * argument isn't NULL. */
+        ( void ) xEventGroupCreateStatic( &pxNewBarrier->xBarrierEventGroup );
+
+        /* Create the semaphore that prevents more than count threads from being
+         * unblocked by a single successful pthread_barrier_wait. This semaphore
+         * counts down from count and cannot decrement below 0. */
+        ( void ) xSemaphoreCreateCountingStatic( ( UBaseType_t ) count, /* Max count. */
+                                                 ( UBaseType_t ) count, /* Initial count. */
+                                                 &pxNewBarrier->xThreadCountSemaphore );
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_barrier_wait( pthread_barrier_t * barrier )
+{
+    int iStatus = 0;
+    unsigned i = 0; /* Loop iterator. */
+    pthread_barrier_internal_t * pxBarrier = ( pthread_barrier_internal_t * ) ( barrier );
+    unsigned uThreadNumber = 0;
+
+    /* Decrement the number of threads waiting on this barrier. This will prevent more
+     * than pxBarrier->uThreshold threads from being unblocked by a single successful
+     * pthread_barrier_wait call.
+     *
+     * This call will never fail because it blocks forever.
+     */
+    ( void ) xSemaphoreTake( ( SemaphoreHandle_t ) &pxBarrier->xThreadCountSemaphore, portMAX_DELAY );
+
+    uThreadNumber = Atomic_Increment_u32( ( uint32_t * ) &pxBarrier->uThreadCount );
+
+    /* Set the bit in the event group representing this thread, then wait for the other
+     * threads to set their bit. This call should wait forever until all threads have set
+     * their bit, so the return value is ignored. */
+    ( void ) xEventGroupSync( ( EventGroupHandle_t ) &pxBarrier->xBarrierEventGroup,
+                              1 << uThreadNumber,                 /* Which bit in the event group to set. */
+                              ( 1 << pxBarrier->uThreshold ) - 1, /* Wait for all threads to set their bits. */
+                              portMAX_DELAY );
+
+    /* The first thread to enter the barrier gets PTHREAD_BARRIER_SERIAL_THREAD as its
+     * return value and resets xThreadCountSemaphore. */
+
+    if( uThreadNumber == 0 )
+    {
+        iStatus = PTHREAD_BARRIER_SERIAL_THREAD;
+
+        /* uThreadCount can be safely changed without locking xThreadCountMutex
+         * because xThreadCountSemaphore is currently 0. */
+        pxBarrier->uThreadCount = 0;
+
+        /* Reset xThreadCountSemaphore. This allows more threads to enter the
+         * barrier, starting a new cycle. */
+        for( i = 0; i < pxBarrier->uThreshold; i++ )
+        {
+            xSemaphoreGive( ( SemaphoreHandle_t ) &pxBarrier->xThreadCountSemaphore );
+        }
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_pthread_cond.c

@@ -0,0 +1,296 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_pthread_cond.c
+ * @brief Implementation of condition variable functions in pthread.h
+ */
+
+/* C standard library includes. */
+#include <limits.h>
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX.h"
+#include "FreeRTOS_POSIX/errno.h"
+#include "FreeRTOS_POSIX/pthread.h"
+#include "FreeRTOS_POSIX/utils.h"
+
+#include "atomic.h"
+
+/**
+ * @brief Initialize a PTHREAD_COND_INITIALIZER cond.
+ *
+ * PTHREAD_COND_INITIALIZER sets a flag for a cond to be initialized later.
+ * This function performs the initialization.
+ * @param[in] pxCond The cond to initialize.
+ *
+ * @return nothing
+ */
+static void prvInitializeStaticCond( pthread_cond_internal_t * pxCond );
+
+/*-----------------------------------------------------------*/
+
+static void prvInitializeStaticCond( pthread_cond_internal_t * pxCond )
+{
+    /* Check if the condition variable needs to be initialized. */
+    if( pxCond->xIsInitialized == pdFALSE )
+    {
+        /* Cond initialization must be in a critical section to prevent two threads
+         * from initializing it at the same time. */
+        taskENTER_CRITICAL();
+
+        /* Check again that the cond is still uninitialized, i.e. it wasn't
+         * initialized while this function was waiting to enter the critical
+         * section. */
+        if( pxCond->xIsInitialized == pdFALSE )
+        {
+            /* Set the members of the cond. The semaphore create calls will never fail
+             * when their arguments aren't NULL. */
+            pxCond->xIsInitialized = pdTRUE;
+            ( void ) xSemaphoreCreateCountingStatic( INT_MAX, 0U, &pxCond->xCondWaitSemaphore );
+            pxCond->iWaitingThreads = 0;
+        }
+
+        /* Exit the critical section. */
+        taskEXIT_CRITICAL();
+    }
+}
+
+/**
+ * @brief Check "atomically" if iLocalWaitingThreads == pxCond->iWaitingThreads and decrement.
+ */
+static void prvTestAndDecrement( pthread_cond_t * pxCond,
+                                 unsigned iLocalWaitingThreads )
+{
+    /* Test local copy of threads waiting is larger than zero. */
+    while( iLocalWaitingThreads > 0 )
+    {
+        /* Test-and-set. Atomically check whether the copy in memory has changed.
+         * And, if not decrease the copy of threads waiting in memory. */
+        if( ATOMIC_COMPARE_AND_SWAP_SUCCESS == Atomic_CompareAndSwap_u32( ( uint32_t * ) &pxCond->iWaitingThreads, ( uint32_t ) iLocalWaitingThreads - 1, ( uint32_t ) iLocalWaitingThreads ) )
+        {
+            /* Signal one succeeded. Break. */
+            break;
+        }
+
+        /* Local copy may be out dated. Reload, and retry. */
+        iLocalWaitingThreads = pxCond->iWaitingThreads;
+    }
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_cond_broadcast( pthread_cond_t * cond )
+{
+    unsigned i = 0;
+    pthread_cond_internal_t * pxCond = ( pthread_cond_internal_t * ) ( cond );
+
+    /* If the cond is uninitialized, perform initialization. */
+    prvInitializeStaticCond( pxCond );
+
+    /* Local copy of number of threads waiting. */
+    unsigned iLocalWaitingThreads = pxCond->iWaitingThreads;
+
+    /* Test local copy of threads waiting is larger than zero. */
+    while( iLocalWaitingThreads > 0 )
+    {
+        /* Test-and-set. Atomically check whether the copy in memory has changed.
+         * And, if not set the copy of threads waiting in memory to zero. */
+        if( ATOMIC_COMPARE_AND_SWAP_SUCCESS == Atomic_CompareAndSwap_u32( ( uint32_t * ) &pxCond->iWaitingThreads, 0, ( uint32_t ) iLocalWaitingThreads ) )
+        {
+            /* Unblock all. */
+            for( i = 0; i < iLocalWaitingThreads; i++ )
+            {
+                ( void ) xSemaphoreGive( ( SemaphoreHandle_t ) &pxCond->xCondWaitSemaphore );
+            }
+
+            break;
+        }
+
+        /* Local copy is out dated. Reload, and retry. */
+        iLocalWaitingThreads = pxCond->iWaitingThreads;
+    }
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_cond_destroy( pthread_cond_t * cond )
+{
+    pthread_cond_internal_t * pxCond = ( pthread_cond_internal_t * ) ( cond );
+
+    /* Free all resources in use by the cond. */
+    vSemaphoreDelete( ( SemaphoreHandle_t ) &pxCond->xCondWaitSemaphore );
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_cond_init( pthread_cond_t * cond,
+                       const pthread_condattr_t * attr )
+{
+    int iStatus = 0;
+    pthread_cond_internal_t * pxCond = ( pthread_cond_internal_t * ) cond;
+
+    /* Silence warnings about unused parameters. */
+    ( void ) attr;
+
+    if( pxCond == NULL )
+    {
+        iStatus = ENOMEM;
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Set the members of the cond. The semaphore create calls will never fail
+         * when their arguments aren't NULL. */
+        pxCond->xIsInitialized = pdTRUE;
+
+        ( void ) xSemaphoreCreateCountingStatic( INT_MAX, 0U, &pxCond->xCondWaitSemaphore );
+        pxCond->iWaitingThreads = 0;
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_cond_signal( pthread_cond_t * cond )
+{
+    pthread_cond_internal_t * pxCond = ( pthread_cond_internal_t * ) ( cond );
+
+    /* If the cond is uninitialized, perform initialization. */
+    prvInitializeStaticCond( pxCond );
+
+    /* Local copy of number of threads waiting. */
+    unsigned iLocalWaitingThreads = pxCond->iWaitingThreads;
+
+    /* Test local copy of threads waiting is larger than zero. */
+    while( iLocalWaitingThreads > 0 )
+    {
+        /* Test-and-set. Atomically check whether the copy in memory has changed.
+         * And, if not decrease the copy of threads waiting in memory. */
+        if( ATOMIC_COMPARE_AND_SWAP_SUCCESS == Atomic_CompareAndSwap_u32( ( uint32_t * ) &pxCond->iWaitingThreads, ( uint32_t ) iLocalWaitingThreads - 1, ( uint32_t ) iLocalWaitingThreads ) )
+        {
+            /* Unblock one. */
+            ( void ) xSemaphoreGive( ( SemaphoreHandle_t ) &pxCond->xCondWaitSemaphore );
+
+            /* Signal one succeeded. Break. */
+            break;
+        }
+
+        /* Local copy may be out dated. Reload, and retry. */
+        iLocalWaitingThreads = pxCond->iWaitingThreads;
+    }
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_cond_timedwait( pthread_cond_t * cond,
+                            pthread_mutex_t * mutex,
+                            const struct timespec * abstime )
+{
+    unsigned iLocalWaitingThreads;
+    int iStatus = 0;
+    pthread_cond_internal_t * pxCond = ( pthread_cond_internal_t * ) ( cond );
+    TickType_t xDelay = portMAX_DELAY;
+
+    /* If the cond is uninitialized, perform initialization. */
+    prvInitializeStaticCond( pxCond );
+
+    /* Convert abstime to a delay in TickType_t if provided. */
+    if( abstime != NULL )
+    {
+        struct timespec xCurrentTime = { 0 };
+
+        /* Get current time */
+        if( clock_gettime( CLOCK_REALTIME, &xCurrentTime ) != 0 )
+        {
+            iStatus = EINVAL;
+        }
+        else
+        {
+            iStatus = UTILS_AbsoluteTimespecToDeltaTicks( abstime, &xCurrentTime, &xDelay );
+        }
+    }
+
+    /* Increase the counter of threads blocking on condition variable, then
+     * unlock mutex. */
+    if( iStatus == 0 )
+    {
+        /* Atomically increments thread waiting by 1, and
+         * stores number of threads waiting before increment. */
+        iLocalWaitingThreads = Atomic_Increment_u32( ( uint32_t * ) &pxCond->iWaitingThreads );
+
+        iStatus = pthread_mutex_unlock( mutex );
+    }
+
+    /* Wait on the condition variable. */
+    if( iStatus == 0 )
+    {
+        if( xSemaphoreTake( ( SemaphoreHandle_t ) &pxCond->xCondWaitSemaphore,
+                            xDelay ) == pdPASS )
+        {
+            /* When successful, relock mutex. */
+            iStatus = pthread_mutex_lock( mutex );
+        }
+        else
+        {
+            /* Timeout. Relock mutex and decrement number of waiting threads. */
+            iStatus = ETIMEDOUT;
+            ( void ) pthread_mutex_lock( mutex );
+
+            /* Atomically decrements thread waiting by 1.
+             * If iLocalWaitingThreads is updated by other thread(s) in between,
+             * this implementation guarantees to decrement by 1 based on the
+             * value currently in pxCond->iWaitingThreads. */
+            prvTestAndDecrement( pxCond, iLocalWaitingThreads + 1 );
+        }
+    }
+    else
+    {
+        /* Atomically decrements thread waiting by 1.
+         * If iLocalWaitingThreads is updated by other thread(s) in between,
+         * this implementation guarantees to decrement by 1 based on the
+         * value currently in pxCond->iWaitingThreads. */
+        prvTestAndDecrement( pxCond, iLocalWaitingThreads + 1 );
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_cond_wait( pthread_cond_t * cond,
+                       pthread_mutex_t * mutex )
+{
+    return pthread_cond_timedwait( cond, mutex, NULL );
+}
+
+/*-----------------------------------------------------------*/

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_pthread_mutex.c

@@ -0,0 +1,373 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_pthread_mutex.c
+ * @brief Implementation of mutex functions in pthread.h
+ */
+
+/* C standard library includes. */
+#include <stddef.h>
+#include <string.h>
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX.h"
+#include "FreeRTOS_POSIX/errno.h"
+#include "FreeRTOS_POSIX/pthread.h"
+#include "FreeRTOS_POSIX/utils.h"
+
+/**
+ * @brief Initialize a PTHREAD_MUTEX_INITIALIZER mutex.
+ *
+ * PTHREAD_MUTEX_INITIALIZER sets a flag for a mutex to be initialized later.
+ * This function performs the initialization.
+ * @param[in] pxMutex The mutex to initialize.
+ *
+ * @return nothing
+ */
+static void prvInitializeStaticMutex( pthread_mutex_internal_t * pxMutex );
+
+/**
+ * @brief Default pthread_mutexattr_t.
+ */
+static const pthread_mutexattr_internal_t xDefaultMutexAttributes =
+{
+    .iType = PTHREAD_MUTEX_DEFAULT,
+};
+
+/*-----------------------------------------------------------*/
+
+static void prvInitializeStaticMutex( pthread_mutex_internal_t * pxMutex )
+{
+    /* Check if the mutex needs to be initialized. */
+    if( pxMutex->xIsInitialized == pdFALSE )
+    {
+        /* Mutex initialization must be in a critical section to prevent two threads
+         * from initializing it at the same time. */
+        taskENTER_CRITICAL();
+
+        /* Check again that the mutex is still uninitialized, i.e. it wasn't
+         * initialized while this function was waiting to enter the critical
+         * section. */
+        if( pxMutex->xIsInitialized == pdFALSE )
+        {
+            /* Set the mutex as the default type. */
+            pxMutex->xAttr.iType = PTHREAD_MUTEX_DEFAULT;
+
+            /* Call the correct FreeRTOS mutex initialization function based on
+             * the mutex type. */
+            #if PTHREAD_MUTEX_DEFAULT == PTHREAD_MUTEX_RECURSIVE
+                ( void ) xSemaphoreCreateRecursiveMutexStatic( &pxMutex->xMutex );
+            #else
+                ( void ) xSemaphoreCreateMutexStatic( &pxMutex->xMutex );
+            #endif
+
+            pxMutex->xIsInitialized = pdTRUE;
+        }
+
+        /* Exit the critical section. */
+        taskEXIT_CRITICAL();
+    }
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_mutex_destroy( pthread_mutex_t * mutex )
+{
+    pthread_mutex_internal_t * pxMutex = ( pthread_mutex_internal_t * ) ( mutex );
+
+    /* Free resources in use by the mutex. */
+    if( pxMutex->xTaskOwner == NULL )
+    {
+        vSemaphoreDelete( ( SemaphoreHandle_t ) &pxMutex->xMutex );
+    }
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_mutex_init( pthread_mutex_t * mutex,
+                        const pthread_mutexattr_t * attr )
+{
+    int iStatus = 0;
+    pthread_mutex_internal_t * pxMutex = ( pthread_mutex_internal_t * ) mutex;
+
+    if( pxMutex == NULL )
+    {
+        /* No memory. */
+        iStatus = ENOMEM;
+    }
+
+    if( iStatus == 0 )
+    {
+        *pxMutex = FREERTOS_POSIX_MUTEX_INITIALIZER;
+
+        /* No attributes given, use default attributes. */
+        if( attr == NULL )
+        {
+            pxMutex->xAttr = xDefaultMutexAttributes;
+        }
+        /* Otherwise, use provided attributes. */
+        else
+        {
+            pxMutex->xAttr = *( ( pthread_mutexattr_internal_t * ) ( attr ) );
+        }
+
+        /* Call the correct FreeRTOS mutex creation function based on mutex type. */
+        if( pxMutex->xAttr.iType == PTHREAD_MUTEX_RECURSIVE )
+        {
+            /* Recursive mutex. */
+            ( void ) xSemaphoreCreateRecursiveMutexStatic( &pxMutex->xMutex );
+        }
+        else
+        {
+            /* All other mutex types. */
+            ( void ) xSemaphoreCreateMutexStatic( &pxMutex->xMutex );
+        }
+
+        /* Ensure that the FreeRTOS mutex was successfully created. */
+        if( ( SemaphoreHandle_t ) &pxMutex->xMutex == NULL )
+        {
+            /* Failed to create mutex. Set error EAGAIN and free mutex object. */
+            iStatus = EAGAIN;
+            vPortFree( pxMutex );
+        }
+        else
+        {
+            /* Mutex successfully created. */
+            pxMutex->xIsInitialized = pdTRUE;
+        }
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_mutex_lock( pthread_mutex_t * mutex )
+{
+    return pthread_mutex_timedlock( mutex, NULL );
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_mutex_timedlock( pthread_mutex_t * mutex,
+                             const struct timespec * abstime )
+{
+    int iStatus = 0;
+    pthread_mutex_internal_t * pxMutex = ( pthread_mutex_internal_t * ) ( mutex );
+    TickType_t xDelay = portMAX_DELAY;
+    BaseType_t xFreeRTOSMutexTakeStatus = pdFALSE;
+
+    /* If mutex in uninitialized, perform initialization. */
+    prvInitializeStaticMutex( pxMutex );
+
+    /* At this point, the mutex should be initialized. */
+    configASSERT( pxMutex->xIsInitialized == pdTRUE );
+
+    /* Convert abstime to a delay in TickType_t if provided. */
+    if( abstime != NULL )
+    {
+        struct timespec xCurrentTime = { 0 };
+
+        /* Get current time */
+        if( clock_gettime( CLOCK_REALTIME, &xCurrentTime ) != 0 )
+        {
+            iStatus = EINVAL;
+        }
+        else
+        {
+            iStatus = UTILS_AbsoluteTimespecToDeltaTicks( abstime, &xCurrentTime, &xDelay );
+        }
+
+        /* If abstime was in the past, still attempt to lock the mutex without
+         * blocking, per POSIX spec. */
+        if( iStatus == ETIMEDOUT )
+        {
+            xDelay = 0;
+            iStatus = 0;
+        }
+    }
+
+    /* Check if trying to lock a currently owned mutex. */
+    if( ( iStatus == 0 ) &&
+        ( pxMutex->xAttr.iType == PTHREAD_MUTEX_ERRORCHECK ) &&  /* Only PTHREAD_MUTEX_ERRORCHECK type detects deadlock. */
+        ( pxMutex->xTaskOwner == xTaskGetCurrentTaskHandle() ) ) /* Check if locking a currently owned mutex. */
+    {
+        iStatus = EDEADLK;
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Call the correct FreeRTOS mutex take function based on mutex type. */
+        if( pxMutex->xAttr.iType == PTHREAD_MUTEX_RECURSIVE )
+        {
+            xFreeRTOSMutexTakeStatus = xSemaphoreTakeRecursive( ( SemaphoreHandle_t ) &pxMutex->xMutex, xDelay );
+        }
+        else
+        {
+            xFreeRTOSMutexTakeStatus = xSemaphoreTake( ( SemaphoreHandle_t ) &pxMutex->xMutex, xDelay );
+        }
+
+        /* If the mutex was successfully taken, set its owner. */
+        if( xFreeRTOSMutexTakeStatus == pdPASS )
+        {
+            pxMutex->xTaskOwner = xTaskGetCurrentTaskHandle();
+        }
+        /* Otherwise, the mutex take timed out. */
+        else
+        {
+            iStatus = ETIMEDOUT;
+        }
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_mutex_trylock( pthread_mutex_t * mutex )
+{
+    int iStatus = 0;
+    struct timespec xTimeout =
+    {
+        .tv_sec  = 0,
+        .tv_nsec = 0
+    };
+
+    /* Attempt to lock with no timeout. */
+    iStatus = pthread_mutex_timedlock( mutex, &xTimeout );
+
+    /* POSIX specifies that this function should return EBUSY instead of
+     * ETIMEDOUT for attempting to lock a locked mutex. */
+    if( iStatus == ETIMEDOUT )
+    {
+        iStatus = EBUSY;
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_mutex_unlock( pthread_mutex_t * mutex )
+{
+    int iStatus = 0;
+    pthread_mutex_internal_t * pxMutex = ( pthread_mutex_internal_t * ) ( mutex );
+
+    /* If mutex in uninitialized, perform initialization. */
+    prvInitializeStaticMutex( pxMutex );
+
+    /* Check if trying to unlock an unowned mutex. */
+    if( ( ( pxMutex->xAttr.iType == PTHREAD_MUTEX_ERRORCHECK ) ||
+          ( pxMutex->xAttr.iType == PTHREAD_MUTEX_RECURSIVE ) ) &&
+        ( pxMutex->xTaskOwner != xTaskGetCurrentTaskHandle() ) )
+    {
+        iStatus = EPERM;
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Suspend the scheduler so that
+         * mutex is unlocked AND owner is updated atomically */
+        vTaskSuspendAll();
+
+        /* Call the correct FreeRTOS mutex unlock function based on mutex type. */
+        if( pxMutex->xAttr.iType == PTHREAD_MUTEX_RECURSIVE )
+        {
+            ( void ) xSemaphoreGiveRecursive( ( SemaphoreHandle_t ) &pxMutex->xMutex );
+        }
+        else
+        {
+            ( void ) xSemaphoreGive( ( SemaphoreHandle_t ) &pxMutex->xMutex );
+        }
+
+        /* Update the owner of the mutex. A recursive mutex may still have an
+         * owner, so it should be updated with xSemaphoreGetMutexHolder. */
+        pxMutex->xTaskOwner = xSemaphoreGetMutexHolder( ( SemaphoreHandle_t ) &pxMutex->xMutex );
+
+        /* Resume the scheduler */
+        ( void ) xTaskResumeAll();
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_mutexattr_destroy( pthread_mutexattr_t * attr )
+{
+    ( void ) attr;
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_mutexattr_gettype( const pthread_mutexattr_t * attr,
+                               int * type )
+{
+    pthread_mutexattr_internal_t * pxAttr = ( pthread_mutexattr_internal_t * ) ( attr );
+
+    *type = pxAttr->iType;
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_mutexattr_init( pthread_mutexattr_t * attr )
+{
+    *( ( pthread_mutexattr_internal_t * ) ( attr ) ) = xDefaultMutexAttributes;
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int pthread_mutexattr_settype( pthread_mutexattr_t * attr,
+                               int type )
+{
+    int iStatus = 0;
+    pthread_mutexattr_internal_t * pxAttr = ( pthread_mutexattr_internal_t * ) ( attr );
+
+    switch( type )
+    {
+        case PTHREAD_MUTEX_NORMAL:
+        case PTHREAD_MUTEX_RECURSIVE:
+        case PTHREAD_MUTEX_ERRORCHECK:
+            pxAttr->iType = type;
+            break;
+
+        default:
+            iStatus = EINVAL;
+            break;
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_sched.c

@@ -0,0 +1,64 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_sched.c
+ * @brief Implementation of scheduler functions in sched.h
+ */
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX.h"
+#include "FreeRTOS_POSIX/sched.h"
+
+/*-----------------------------------------------------------*/
+
+int sched_get_priority_max( int policy )
+{
+    /* Silence warnings about unused parameters. */
+    ( void ) policy;
+
+    return configMAX_PRIORITIES - 1;
+}
+
+/*-----------------------------------------------------------*/
+
+int sched_get_priority_min( int policy )
+{
+    /* Silence warnings about unused parameters. */
+    ( void ) policy;
+
+    return tskIDLE_PRIORITY;
+}
+
+/*-----------------------------------------------------------*/
+
+int sched_yield( void )
+{
+    taskYIELD();
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_semaphore.c

@@ -0,0 +1,232 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_semaphore.c
+ * @brief Implementation of functions in semaphore.h
+ */
+
+/* C standard library includes. */
+#include <stddef.h>
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX.h"
+#include "FreeRTOS_POSIX/errno.h"
+#include "FreeRTOS_POSIX/semaphore.h"
+#include "FreeRTOS_POSIX/utils.h"
+
+#include "atomic.h"
+
+
+/*-----------------------------------------------------------*/
+
+int sem_destroy( sem_t * sem )
+{
+    sem_internal_t * pxSem = ( sem_internal_t * ) ( sem );
+
+    /* Free the resources in use by the semaphore. */
+    vSemaphoreDelete( ( SemaphoreHandle_t ) &pxSem->xSemaphore );
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int sem_getvalue( sem_t * sem,
+                  int * sval )
+{
+    sem_internal_t * pxSem = ( sem_internal_t * ) ( sem );
+
+    /* Get value does not need atomic operation, since -- Open Group
+     * states "the updated value represents an actual semaphore value that
+     * occurred at some unspecified time during the call, but it need not be the
+     * actual value of the semaphore when it is returned to the calling process."
+     */
+    *sval = pxSem->value;
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int sem_init( sem_t * sem,
+              int pshared,
+              unsigned value )
+{
+    int iStatus = 0;
+    sem_internal_t * pxSem = ( sem_internal_t * ) ( sem );
+
+    /* Silence warnings about unused parameters. */
+    ( void ) pshared;
+
+    /* Check value parameter. */
+    if( value > SEM_VALUE_MAX )
+    {
+        errno = EINVAL;
+        iStatus = -1;
+    }
+
+    /* value is guaranteed to not exceed INT32_MAX, which is the default value of SEM_VALUE_MAX (0x7FFFU). */
+    pxSem->value = ( int ) value;
+
+    /* Create the FreeRTOS semaphore.
+     * This is only used to queue threads when no semaphore is available.
+     * Initializing with semaphore initial count zero.
+     * This call will not fail because the memory for the semaphore has already been allocated.
+     */
+    if( iStatus == 0 )
+    {
+        ( void ) xSemaphoreCreateCountingStatic( SEM_VALUE_MAX, 0, &pxSem->xSemaphore );
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int sem_post( sem_t * sem )
+{
+    sem_internal_t * pxSem = ( sem_internal_t * ) ( sem );
+
+    int iPreviouValue = Atomic_Increment_u32( ( uint32_t * ) &pxSem->value );
+
+    /* If previous semaphore value is equal or larger than zero, there is no
+     * thread waiting for this semaphore. Otherwise (<0), call FreeRTOS interface
+     * to wake up a thread. */
+    if( iPreviouValue < 0 )
+    {
+        /* Give the semaphore using the FreeRTOS API. */
+        ( void ) xSemaphoreGive( ( SemaphoreHandle_t ) &pxSem->xSemaphore );
+    }
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int sem_timedwait( sem_t * sem,
+                   const struct timespec * abstime )
+{
+    int iStatus = 0;
+    sem_internal_t * pxSem = ( sem_internal_t * ) ( sem );
+    TickType_t xDelay = portMAX_DELAY;
+    int iPreviousValue = Atomic_Decrement_u32( ( uint32_t * ) &pxSem->value );
+
+    if( abstime != NULL )
+    {
+        /* If the provided timespec is invalid, still attempt to take the
+         * semaphore without blocking, per POSIX spec. */
+        if( UTILS_ValidateTimespec( abstime ) == false )
+        {
+            xDelay = 0;
+            iStatus = EINVAL;
+        }
+        else
+        {
+            struct timespec xCurrentTime = { 0 };
+
+            /* Get current time */
+            if( clock_gettime( CLOCK_REALTIME, &xCurrentTime ) != 0 )
+            {
+                iStatus = EINVAL;
+            }
+            else
+            {
+                iStatus = UTILS_AbsoluteTimespecToDeltaTicks( abstime, &xCurrentTime, &xDelay );
+            }
+
+            /* If abstime was in the past, still attempt to take the semaphore without
+             * blocking, per POSIX spec. */
+            if( iStatus == ETIMEDOUT )
+            {
+                xDelay = 0;
+            }
+        }
+    }
+
+    /* If previous semaphore value is larger than zero, the thread entering this function call
+     * can take the semaphore without yielding. Else (<=0), calling into FreeRTOS API to yield.
+     */
+    if( iPreviousValue > 0 )
+    {
+        /* Under no circumstance shall the function fail with a timeout if the semaphore can be locked immediately. */
+        iStatus = 0;
+    }
+    else
+    {
+        /* Take the semaphore using the FreeRTOS API. */
+        if( xSemaphoreTake( ( SemaphoreHandle_t ) &pxSem->xSemaphore,
+                            xDelay ) != pdTRUE )
+        {
+            if( iStatus == 0 )
+            {
+                errno = ETIMEDOUT;
+            }
+            else
+            {
+                errno = iStatus;
+            }
+
+            iStatus = -1;
+        }
+        else
+        {
+            iStatus = 0;
+        }
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int sem_trywait( sem_t * sem )
+{
+    int iStatus = 0;
+
+    /* Setting an absolute timeout of 0 (i.e. in the past) will cause sem_timedwait
+     * to not block. */
+    struct timespec xTimeout = { 0 };
+
+    iStatus = sem_timedwait( sem, &xTimeout );
+
+    /* POSIX specifies that this function should set errno to EAGAIN and not
+     * ETIMEDOUT. */
+    if( ( iStatus == -1 ) && ( errno == ETIMEDOUT ) )
+    {
+        errno = EAGAIN;
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int sem_wait( sem_t * sem )
+{
+    return sem_timedwait( sem, NULL );
+}
+
+/*-----------------------------------------------------------*/

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_timer.c

@@ -0,0 +1,330 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_timer.c
+ * @brief Implementation of timer functions in time.h
+ */
+
+/* C standard library includes. */
+#include <stddef.h>
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX.h"
+#include "FreeRTOS_POSIX/errno.h"
+#include "FreeRTOS_POSIX/pthread.h"
+#include "FreeRTOS_POSIX/signal.h"
+#include "FreeRTOS_POSIX/time.h"
+#include "FreeRTOS_POSIX/utils.h"
+
+/* FreeRTOS timer include. */
+#include "timers.h"
+
+/* Timespec zero check macros. */
+#define TIMESPEC_IS_ZERO( xTimespec )        ( xTimespec.tv_sec == 0 && xTimespec.tv_nsec == 0 ) /**< Check for 0. */
+#define TIMESPEC_IS_NOT_ZERO( xTimespec )    ( !( TIMESPEC_IS_ZERO( xTimespec ) ) )              /**< Check for not 0. */
+
+/**
+ * @brief Internal timer structure.
+ */
+typedef struct timer_internal
+{
+    StaticTimer_t xTimerBuffer;  /**< Memory that holds the FreeRTOS timer. */
+    struct sigevent xTimerEvent; /**< What to do when this timer expires. */
+    TickType_t xTimerPeriod;     /**< Period of this timer. */
+} timer_internal_t;
+
+/*-----------------------------------------------------------*/
+
+void prvTimerCallback( TimerHandle_t xTimerHandle )
+{
+    timer_internal_t * pxTimer = ( timer_internal_t * ) pvTimerGetTimerID( xTimerHandle );
+    pthread_t xTimerNotificationThread;
+
+    /* The value of the timer ID, set in timer_create, should not be NULL. */
+    configASSERT( pxTimer != NULL );
+
+    /* A value of SIGEV_SIGNAL isn't supported and should not have been successfully
+     * set. */
+    configASSERT( pxTimer->xTimerEvent.sigev_notify != SIGEV_SIGNAL );
+
+    /* Update the timer period, which may need to be set to an it_interval
+     * argument. This call should not block. */
+    if( pxTimer->xTimerPeriod > 0 )
+    {
+        xTimerChangePeriod( xTimerHandle, pxTimer->xTimerPeriod, 0 );
+    }
+
+    /* Create the timer notification thread if requested. */
+    if( pxTimer->xTimerEvent.sigev_notify == SIGEV_THREAD )
+    {
+        /* if the user has provided thread attributes, create a thread
+         * with the provided attributes. Otherwise dispatch callback directly */
+        if( pxTimer->xTimerEvent.sigev_notify_attributes == NULL )
+        {
+            ( *pxTimer->xTimerEvent.sigev_notify_function )( pxTimer->xTimerEvent.sigev_value );
+        }
+        else
+        {
+            ( void ) pthread_create( &xTimerNotificationThread,
+                                     pxTimer->xTimerEvent.sigev_notify_attributes,
+                                     ( void * ( * )( void * ) )pxTimer->xTimerEvent.sigev_notify_function,
+                                     pxTimer->xTimerEvent.sigev_value.sival_ptr );
+        }
+    }
+}
+
+/*-----------------------------------------------------------*/
+
+int timer_create( clockid_t clockid,
+                  struct sigevent * evp,
+                  timer_t * timerid )
+{
+    int iStatus = 0;
+    timer_internal_t * pxTimer = NULL;
+
+    /* Silence warnings about unused parameters. */
+    ( void ) clockid;
+
+    /* POSIX specifies that when evp is NULL, the behavior shall be as is
+     * sigev_notify is SIGEV_SIGNAL. SIGEV_SIGNAL is currently not supported. */
+    if( ( evp == NULL ) || ( evp->sigev_notify == SIGEV_SIGNAL ) )
+    {
+        errno = ENOTSUP;
+        iStatus = -1;
+    }
+
+    /* Allocate memory for a new timer object. */
+    if( iStatus == 0 )
+    {
+        pxTimer = pvPortMalloc( sizeof( timer_internal_t ) );
+
+        if( pxTimer == NULL )
+        {
+            errno = EAGAIN;
+            iStatus = -1;
+        }
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Copy the event notification structure and set the current timer period. */
+        pxTimer->xTimerEvent = *evp;
+        pxTimer->xTimerPeriod = 0;
+
+        /* Create a new FreeRTOS timer. This call will not fail because the
+         * memory for it has already been allocated, so the output parameter is
+         * also set. */
+        *timerid = ( timer_t ) xTimerCreateStatic( posixconfigTIMER_NAME,    /* Timer name. */
+                                                   portMAX_DELAY,            /* Initial timer period. Timers are created disarmed. */
+                                                   pdFALSE,                  /* Don't auto-reload timer. */
+                                                   ( void * ) pxTimer,       /* Timer id. */
+                                                   prvTimerCallback,         /* Timer expiration callback. */
+                                                   &pxTimer->xTimerBuffer ); /* Pre-allocated memory for timer. */
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int timer_delete( timer_t timerid )
+{
+    TimerHandle_t xTimerHandle = timerid;
+    timer_internal_t * pxTimer = ( timer_internal_t * ) pvTimerGetTimerID( xTimerHandle );
+
+    /* The value of the timer ID, set in timer_create, should not be NULL. */
+    configASSERT( pxTimer != NULL );
+
+    /* Stop the FreeRTOS timer. Because the timer is statically allocated, no call
+     * to xTimerDelete is necessary. The timer is stopped so that it's not referenced
+     * anywhere. xTimerStop will not fail when it has unlimited block time. */
+    ( void ) xTimerStop( xTimerHandle, portMAX_DELAY );
+
+    /* Wait until the timer stop command is processed. */
+    while( xTimerIsTimerActive( xTimerHandle ) == pdTRUE )
+    {
+        vTaskDelay( 1 );
+    }
+
+    /* Free the memory in use by the timer. */
+    vPortFree( pxTimer );
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int timer_getoverrun( timer_t timerid )
+{
+    /* Silence warnings about unused parameters. */
+    ( void ) timerid;
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int timer_settime( timer_t timerid,
+                   int flags,
+                   const struct itimerspec * value,
+                   struct itimerspec * ovalue )
+{
+    int iStatus = 0;
+    TimerHandle_t xTimerHandle = timerid;
+    timer_internal_t * pxTimer = ( timer_internal_t * ) pvTimerGetTimerID( xTimerHandle );
+    TickType_t xNextTimerExpiration = 0, xTimerExpirationPeriod = 0;
+
+    /* Validate the value argument, but only if the timer isn't being disarmed. */
+    if( TIMESPEC_IS_NOT_ZERO( value->it_value ) )
+    {
+        if( ( UTILS_ValidateTimespec( &value->it_interval ) == false ) ||
+            ( UTILS_ValidateTimespec( &value->it_value ) == false ) )
+        {
+            errno = EINVAL;
+            iStatus = -1;
+        }
+    }
+
+    /* Set ovalue, if given. */
+    if( ovalue != NULL )
+    {
+        ( void ) timer_gettime( timerid, ovalue );
+    }
+
+    /* Stop the timer if it's currently active. */
+    if( ( iStatus == 0 ) && xTimerIsTimerActive( xTimerHandle ) )
+    {
+        ( void ) xTimerStop( xTimerHandle, portMAX_DELAY );
+    }
+
+    /* Only restart the timer if it_value is not zero. */
+    if( ( iStatus == 0 ) && TIMESPEC_IS_NOT_ZERO( value->it_value ) )
+    {
+        /* Convert it_interval to ticks, but only if it_interval is not 0. If
+         * it_interval is 0, then the timer is not periodic. */
+        if( TIMESPEC_IS_NOT_ZERO( value->it_interval ) )
+        {
+            ( void ) UTILS_TimespecToTicks( &value->it_interval, &xTimerExpirationPeriod );
+        }
+
+        /* Set the new timer period. A non-periodic timer will have its period set
+         * to portMAX_DELAY. */
+        pxTimer->xTimerPeriod = xTimerExpirationPeriod;
+
+        /* Convert it_value to ticks, but only if it_value is not 0. If it_value
+         * is 0, then the timer will remain disarmed. */
+        if( TIMESPEC_IS_NOT_ZERO( value->it_value ) )
+        {
+            /* Absolute timeout. */
+            if( ( flags & TIMER_ABSTIME ) == TIMER_ABSTIME )
+            {
+                struct timespec xCurrentTime = { 0 };
+
+                /* Get current time */
+                if( clock_gettime( CLOCK_REALTIME, &xCurrentTime ) != 0 )
+                {
+                    iStatus = EINVAL;
+                }
+                else
+                {
+                    iStatus = UTILS_AbsoluteTimespecToDeltaTicks( &value->it_value, &xCurrentTime, &xNextTimerExpiration );
+                }
+
+                /* Make sure xNextTimerExpiration is zero in case we got negative time difference */
+                if( iStatus != 0 )
+                {
+                    xNextTimerExpiration = 0;
+
+                    if( iStatus == ETIMEDOUT )
+                    {
+                        /* Set Status to 0 as absolute time is past is treated as expiry but not an error */
+                        iStatus = 0;
+                    }
+                }
+            }
+            /* Relative timeout. */
+            else
+            {
+                ( void ) UTILS_TimespecToTicks( &value->it_value, &xNextTimerExpiration );
+            }
+        }
+
+        /* If xNextTimerExpiration is still 0, that means that it_value specified
+         * an absolute timeout in the past. Per POSIX spec, a notification should be
+         * triggered immediately. */
+        if( xNextTimerExpiration == 0 )
+        {
+            prvTimerCallback( xTimerHandle );
+        }
+        else
+        {
+            /* Set the timer to expire at the it_value, then start it. */
+            ( void ) xTimerChangePeriod( xTimerHandle, xNextTimerExpiration, portMAX_DELAY );
+            ( void ) xTimerStart( xTimerHandle, xNextTimerExpiration );
+        }
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int timer_gettime( timer_t timerid,
+                   struct itimerspec * value )
+{
+    TimerHandle_t xTimerHandle = timerid;
+    timer_internal_t * pxTimer = ( timer_internal_t * ) pvTimerGetTimerID( xTimerHandle );
+    TickType_t xNextExpirationTime = xTimerGetExpiryTime( xTimerHandle ) - xTaskGetTickCount(),
+               xTimerExpirationPeriod = pxTimer->xTimerPeriod;
+
+    /* Set it_value only if the timer is armed. Otherwise, set it to 0. */
+    if( xTimerIsTimerActive( xTimerHandle ) != pdFALSE )
+    {
+        value->it_value.tv_sec = ( time_t ) ( xNextExpirationTime / configTICK_RATE_HZ );
+        value->it_value.tv_nsec = ( long ) ( ( xNextExpirationTime % configTICK_RATE_HZ ) * NANOSECONDS_PER_TICK );
+    }
+    else
+    {
+        value->it_value.tv_sec = 0;
+        value->it_value.tv_nsec = 0;
+    }
+
+    /* Set it_interval only if the timer is periodic. Otherwise, set it to 0. */
+    if( xTimerExpirationPeriod != portMAX_DELAY )
+    {
+        value->it_interval.tv_sec = ( time_t ) ( xTimerExpirationPeriod / configTICK_RATE_HZ );
+        value->it_interval.tv_nsec = ( long ) ( ( xTimerExpirationPeriod % configTICK_RATE_HZ ) * NANOSECONDS_PER_TICK );
+    }
+    else
+    {
+        value->it_interval.tv_sec = 0;
+        value->it_interval.tv_nsec = 0;
+    }
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_unistd.c

@@ -0,0 +1,54 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_unistd.c
+ * @brief Implementation of functions in unistd.h
+ */
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX.h"
+#include "FreeRTOS_POSIX/unistd.h"
+
+/*-----------------------------------------------------------*/
+
+unsigned sleep( unsigned seconds )
+{
+    vTaskDelay( pdMS_TO_TICKS( seconds * 1000 ) );
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/
+
+int usleep( useconds_t usec )
+{
+    /* To avoid delaying for less than usec, always round up. */
+    vTaskDelay( pdMS_TO_TICKS( usec / 1000 + ( usec % 1000 != 0 ) ) );
+
+    return 0;
+}
+
+/*-----------------------------------------------------------*/

freertos/Source/FreeRTOS-Plus-POSIX/FreeRTOS-Plus-POSIX/source/FreeRTOS_POSIX_utils.c

@@ -0,0 +1,388 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file FreeRTOS_POSIX_utils.c
+ * @brief Implementation of utility functions in utils.h
+ */
+
+/* C standard library includes. */
+#include <stddef.h>
+#include <limits.h>
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX.h"
+#include "FreeRTOS_POSIX/errno.h"
+#include "FreeRTOS_POSIX/utils.h"
+
+/*-----------------------------------------------------------*/
+
+size_t UTILS_strnlen( const char * const pcString,
+                      size_t xMaxLength )
+{
+    const char * pcCharPointer = pcString;
+    size_t xLength = 0;
+
+    if( pcString != NULL )
+    {
+        while( ( *pcCharPointer != '\0' ) && ( xLength < xMaxLength ) )
+        {
+            xLength++;
+            pcCharPointer++;
+        }
+    }
+
+    return xLength;
+}
+
+/*-----------------------------------------------------------*/
+
+int UTILS_AbsoluteTimespecToDeltaTicks( const struct timespec * const pxAbsoluteTime,
+                                        const struct timespec * const pxCurrentTime,
+                                        TickType_t * const pxResult )
+{
+    int iStatus = 0;
+    struct timespec xDifference = { 0 };
+
+    /* Check parameters. */
+    if( ( pxAbsoluteTime == NULL ) || ( pxCurrentTime == NULL ) || ( pxResult == NULL ) )
+    {
+        iStatus = EINVAL;
+    }
+
+    /* Calculate the difference between the current time and absolute time. */
+    if( iStatus == 0 )
+    {
+        iStatus = UTILS_TimespecSubtract( pxAbsoluteTime, pxCurrentTime, &xDifference );
+
+        if( iStatus == 1 )
+        {
+            /* pxAbsoluteTime was in the past. */
+            iStatus = ETIMEDOUT;
+        }
+        else if( iStatus == -1 )
+        {
+            /* error */
+            iStatus = EINVAL;
+        }
+    }
+
+    /* Convert the time difference to ticks. */
+    if( iStatus == 0 )
+    {
+        iStatus = UTILS_TimespecToTicks( &xDifference, pxResult );
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int UTILS_TimespecToTicks( const struct timespec * const pxTimespec,
+                           TickType_t * const pxResult )
+{
+    int iStatus = 0;
+    int64_t llTotalTicks = 0;
+    long lNanoseconds = 0;
+
+    /* Check parameters. */
+    if( ( pxTimespec == NULL ) || ( pxResult == NULL ) )
+    {
+        iStatus = EINVAL;
+    }
+    else if( ( iStatus == 0 ) && ( UTILS_ValidateTimespec( pxTimespec ) == false ) )
+    {
+        iStatus = EINVAL;
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Convert timespec.tv_sec to ticks. */
+        llTotalTicks = ( int64_t ) configTICK_RATE_HZ * ( pxTimespec->tv_sec );
+
+        /* Convert timespec.tv_nsec to ticks. This value does not have to be checked
+         * for overflow because a valid timespec has 0 <= tv_nsec < 1000000000 and
+         * NANOSECONDS_PER_TICK > 1. */
+        lNanoseconds = pxTimespec->tv_nsec / ( long ) NANOSECONDS_PER_TICK +                  /* Whole nanoseconds. */
+                       ( long ) ( pxTimespec->tv_nsec % ( long ) NANOSECONDS_PER_TICK != 0 ); /* Add 1 to round up if needed. */
+
+        /* Add the nanoseconds to the total ticks. */
+        llTotalTicks += ( int64_t ) lNanoseconds;
+
+        /* Check for overflow */
+        if( llTotalTicks < 0 )
+        {
+            iStatus = EINVAL;
+        }
+        else
+        {
+            /* check if TickType_t is 32 bit or 64 bit */
+            uint32_t ulTickTypeSize = sizeof( TickType_t );
+
+            /* check for downcast overflow */
+            if( ulTickTypeSize == sizeof( uint32_t ) )
+            {
+                if( llTotalTicks > UINT_MAX )
+                {
+                    iStatus = EINVAL;
+                }
+            }
+        }
+
+        /* Write result. */
+        *pxResult = ( TickType_t ) llTotalTicks;
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+void UTILS_NanosecondsToTimespec( int64_t llSource,
+                                  struct timespec * const pxDestination )
+{
+    long lCarrySec = 0;
+
+    /* Convert to timespec. */
+    pxDestination->tv_sec = ( time_t ) ( llSource / NANOSECONDS_PER_SECOND );
+    pxDestination->tv_nsec = ( long ) ( llSource % NANOSECONDS_PER_SECOND );
+
+    /* Subtract from tv_sec if tv_nsec < 0. */
+    if( pxDestination->tv_nsec < 0L )
+    {
+        /* Compute the number of seconds to carry. */
+        lCarrySec = ( pxDestination->tv_nsec / ( long ) NANOSECONDS_PER_SECOND ) + 1L;
+
+        pxDestination->tv_sec -= ( time_t ) ( lCarrySec );
+        pxDestination->tv_nsec += lCarrySec * ( long ) NANOSECONDS_PER_SECOND;
+    }
+}
+
+/*-----------------------------------------------------------*/
+
+int UTILS_TimespecAdd( const struct timespec * const x,
+                       const struct timespec * const y,
+                       struct timespec * const pxResult )
+{
+    int64_t llPartialSec = 0;
+    int iStatus = 0;
+
+    /* Check parameters. */
+    if( ( pxResult == NULL ) || ( x == NULL ) || ( y == NULL ) )
+    {
+        iStatus = -1;
+    }
+
+    if( iStatus == 0 )
+    {
+        /* Perform addition. */
+        pxResult->tv_nsec = x->tv_nsec + y->tv_nsec;
+
+        /* check for overflow in case nsec value was invalid */
+        if( pxResult->tv_nsec < 0 )
+        {
+            iStatus = 1;
+        }
+        else
+        {
+            llPartialSec = ( pxResult->tv_nsec ) / NANOSECONDS_PER_SECOND;
+            pxResult->tv_nsec = ( pxResult->tv_nsec ) % NANOSECONDS_PER_SECOND;
+            pxResult->tv_sec = x->tv_sec + y->tv_sec + llPartialSec;
+
+            /* check for overflow */
+            if( pxResult->tv_sec < 0 )
+            {
+                iStatus = 1;
+            }
+        }
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int UTILS_TimespecAddNanoseconds( const struct timespec * const x,
+                                  int64_t llNanoseconds,
+                                  struct timespec * const pxResult )
+{
+    int64_t llTotalNSec = 0;
+    int iStatus = 0;
+
+    /* Check parameters. */
+    if( ( pxResult == NULL ) || ( x == NULL ) )
+    {
+        iStatus = -1;
+    }
+
+    if( iStatus == 0 )
+    {
+        /* add nano seconds */
+        llTotalNSec = x->tv_nsec + llNanoseconds;
+
+        /* check for nano seconds overflow */
+        if( llTotalNSec < 0 )
+        {
+            iStatus = 1;
+        }
+        else
+        {
+            pxResult->tv_nsec = llTotalNSec % NANOSECONDS_PER_SECOND;
+            pxResult->tv_sec = x->tv_sec + ( llTotalNSec / NANOSECONDS_PER_SECOND );
+
+            /* check for seconds overflow */
+            if( pxResult->tv_sec < 0 )
+            {
+                iStatus = 1;
+            }
+        }
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int UTILS_TimespecSubtract( const struct timespec * const x,
+                            const struct timespec * const y,
+                            struct timespec * const pxResult )
+{
+    int iCompareResult = 0;
+    int iStatus = 0;
+
+    /* Check parameters. */
+    if( ( pxResult == NULL ) || ( x == NULL ) || ( y == NULL ) )
+    {
+        iStatus = -1;
+    }
+
+    if( iStatus == 0 )
+    {
+        iCompareResult = UTILS_TimespecCompare( x, y );
+
+        /* if x < y then result would be negative, return 1 */
+        if( iCompareResult == -1 )
+        {
+            iStatus = 1;
+        }
+        else if( iCompareResult == 0 )
+        {
+            /* if times are the same return zero */
+            pxResult->tv_sec = 0;
+            pxResult->tv_nsec = 0;
+        }
+        else
+        {
+            /* If x > y Perform subtraction. */
+            pxResult->tv_sec = x->tv_sec - y->tv_sec;
+            pxResult->tv_nsec = x->tv_nsec - y->tv_nsec;
+
+            /* check if nano seconds value needs to borrow */
+            if( pxResult->tv_nsec < 0 )
+            {
+                /* Based on comparison, tv_sec > 0 */
+                pxResult->tv_sec--;
+                pxResult->tv_nsec += ( long ) NANOSECONDS_PER_SECOND;
+            }
+
+            /* if nano second is negative after borrow, it is an overflow error */
+            if( pxResult->tv_nsec < 0 )
+            {
+                iStatus = -1;
+            }
+        }
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+int UTILS_TimespecCompare( const struct timespec * const x,
+                           const struct timespec * const y )
+{
+    int iStatus = 0;
+
+    /* Check parameters */
+    if( ( x == NULL ) && ( y == NULL ) )
+    {
+        iStatus = 0;
+    }
+    else if( y == NULL )
+    {
+        iStatus = 1;
+    }
+    else if( x == NULL )
+    {
+        iStatus = -1;
+    }
+    else if( x->tv_sec > y->tv_sec )
+    {
+        iStatus = 1;
+    }
+    else if( x->tv_sec < y->tv_sec )
+    {
+        iStatus = -1;
+    }
+    else
+    {
+        /* seconds are equal compare nano seconds */
+        if( x->tv_nsec > y->tv_nsec )
+        {
+            iStatus = 1;
+        }
+        else if( x->tv_nsec < y->tv_nsec )
+        {
+            iStatus = -1;
+        }
+        else
+        {
+            iStatus = 0;
+        }
+    }
+
+    return iStatus;
+}
+
+/*-----------------------------------------------------------*/
+
+bool UTILS_ValidateTimespec( const struct timespec * const pxTimespec )
+{
+    bool xReturn = false;
+
+    if( pxTimespec != NULL )
+    {
+        /* Verify 0 <= tv_nsec < 1000000000. */
+        if( ( pxTimespec->tv_nsec >= 0 ) &&
+            ( pxTimespec->tv_nsec < NANOSECONDS_PER_SECOND ) )
+        {
+            xReturn = true;
+        }
+    }
+
+    return xReturn;
+}
+
+/*-----------------------------------------------------------*/

freertos/Source/FreeRTOS-Plus-POSIX/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019 FreeRTOS
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

freertos/Source/FreeRTOS-Plus-POSIX/README.md

@@ -0,0 +1,15 @@
+## FreeRTOS+POSIX: Portable Operating System Interface (POSIX threading wrapper) for FreeRTOS
+
+The Portable Operating System Interface (POSIX) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems. FreeRTOS+POSIX implements a subset of the [POSIX threading](https://pubs.opengroup.org/onlinepubs/7908799/xsh/threads.html) API.
+
+With FreeRTOS+POSIX, an existing POSIX threading compliant application can be ported to run on the FreeRTOS kernel, and therefor leverage all the [Amazon FreeRTOS](https://www.freertos.org/FAQ_Amazon.html) functionality. Additionally, a library designed for use with POSIX threading compatible operating systems can be ported to FreeRTOS kernel based applications.
+
+For more on FreeRTOS+POSIX, please visit [freertos.org](https://www.freertos.org/FreeRTOS-Plus/FreeRTOS_Plus_POSIX/index.html)
+
+This repository only contains source code. For demo applications, please visit https://github.com/FreeRTOS/FreeRTOS-Labs. 
+
+## To consume FreeRTOS+POSIX 
+It is recommended to use this repository as a submodule. Please refer to [Git Tools — Submodules](https://git-scm.com/book/en/v2/Git-Tools-Submodules). 
+
+## Notes
+This project is undergoing optimizations or refactorization to improve memory usage, modularity, documentation, demo usability, or test coverage. 

freertos/Source/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX/errno.h

@@ -0,0 +1,103 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file errno.h
+ * @brief System error numbers.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html
+ *
+ * The values defined in this file may not be compatible with the strerror
+ * function provided by this system.
+ */
+
+#ifndef _FREERTOS_POSIX_ERRNO_H_
+#define _FREERTOS_POSIX_ERRNO_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Undefine all errnos to avoid redefinition errors with system errnos. */
+#undef EPERM
+#undef ENOENT
+#undef EBADF
+#undef EAGAIN
+#undef ENOMEM
+#undef EEXIST
+#undef EBUSY
+#undef EINVAL
+#undef ENOSPC
+#undef ERANGE
+#undef ENAMETOOLONG
+#undef EDEADLK
+#undef EOVERFLOW
+#undef ENOSYS
+#undef EMSGSIZE
+#undef ENOTSUP
+#undef ETIMEDOUT
+
+/**
+ * @name Definition of POSIX errnos.
+ */
+/**@{ */
+#define EPERM           1   /**< Operation not permitted. */
+#define ENOENT          2   /**< No such file or directory. */
+#define EBADF           9   /**< Bad file descriptor. */
+#define EAGAIN          11  /**< Resource unavailable, try again. */
+#define ENOMEM          12  /**< Not enough space. */
+#define EEXIST          17  /**< File exists. */
+#define EBUSY           16  /**< Device or resource busy. */
+#define EINVAL          22  /**< Invalid argument. */
+#define ENOSPC          28  /**< No space left on device. */
+#define ERANGE          34  /**< Result too large. */
+#define ENAMETOOLONG    36  /**< File name too long. */
+#define EDEADLK         45  /**< Resource deadlock would occur. */
+#define EOVERFLOW       75  /**< Value too large to be stored in data type. */
+#define ENOSYS          88  /**< Function not supported. */
+#define EMSGSIZE        90  /**< Message too long. */
+#define ENOTSUP         95  /**< Operation not supported. */
+#define ETIMEDOUT       116 /**< Connection timed out. */
+/**@} */
+
+/**
+ * @name System Variable
+ *
+ * @brief Define FreeRTOS+POSIX errno, if enabled.
+ * Set configUSE_POSIX_ERRNO to enable, and clear to disable. See FreeRTOS.h.
+ *
+ * @{
+ */
+#if ( configUSE_POSIX_ERRNO == 1 )
+    extern int FreeRTOS_errno;
+    #define errno    FreeRTOS_errno
+#endif
+/**@} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef _FREERTOS_POSIX_ERRNO_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX/fcntl.h

@@ -0,0 +1,87 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file fcntl.h
+ * @brief File control options.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/fcntl.h.html
+ */
+
+#ifndef _FREERTOS_POSIX_FCNTL_H_
+#define _FREERTOS_POSIX_FCNTL_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @name File creation flags for use in the oflag value to open() and openat().
+ */
+/**@{ */
+#define O_CLOEXEC      0x0001 /**< Close the file descriptor upon exec(). */
+#define O_CREAT        0x0002 /**< Create file if it does not exist. */
+#define O_DIRECTORY    0x0004 /**< Fail if file is a non-directory file. */
+#define O_EXCL         0x0008 /**< Exclusive use flag. */
+#define O_NOCTTY       0x0010 /**< Do not assign controlling terminal. */
+#define O_NOFOLLOW     0x0020 /**< Do not follow symbolic links. */
+#define O_TRUNC        0x0040 /**< Truncate flag. */
+#define O_TTY_INIT     0x0080 /**< termios structure provides conforming behavior. */
+/**@} */
+
+/**
+ * @name File status flags for open(), openat(), and fcntl().
+ */
+/**@{ */
+#define O_APPEND      0x0100 /**< Set append mode. */
+#define O_DSYNC       0x0200 /**< Write according to synchronized I/O data integrity completion. */
+#define O_NONBLOCK    0x0400 /**< Non-blocking mode. */
+#define O_RSYNC       0x0800 /**< Synchronized read I/O operations. */
+#define O_SYNC        0x0200 /**< Write according to synchronized I/O file integrity completion. */
+/**@} */
+
+/**
+ * @name Mask for file access modes.
+ */
+/**@{ */
+#define O_ACCMODE    0xF000
+/**@} */
+
+/**
+ * @name File access modes for open(), openat(), and fcntl().
+ */
+/**@{ */
+#define O_EXEC      0x1000  /**< Open for execute only (non-directory files). */
+#define O_RDONLY    0x2000  /**< Open for reading only. */
+#define O_RDWR      0xA000  /**< Open for reading and writing. */
+#define O_SEARCH    0x4000  /**< Open directory for search only. */
+#define O_WRONLY    0x8000  /**< Open for writing only. */
+/**@} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef _FREERTOS_POSIX_FCNTL_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX/mqueue.h

@@ -0,0 +1,258 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file mqueue.h
+ * @brief Message queues.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/mqueue.h.html
+ */
+
+#ifndef _FREERTOS_POSIX_MQUEUE_H_
+#define _FREERTOS_POSIX_MQUEUE_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX/time.h"
+
+/**
+ * @brief Message queue descriptor.
+ */
+typedef void * mqd_t;
+
+/**
+ * @brief Message queue attributes.
+ */
+struct mq_attr
+{
+    long mq_flags;   /**< Message queue flags. */
+    long mq_maxmsg;  /**< Maximum number of messages. */
+    long mq_msgsize; /**< Maximum message size. */
+    long mq_curmsgs; /**< Number of messages currently queued. */
+};
+
+/**
+ * @brief Close a message queue.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/mq_close.html
+ *
+ * @retval 0 - Upon successful completion
+ * @retval -1 - A error occurred. errno is also set.
+ *
+ * @sideeffect Possible errno values
+ * <br>
+ * EBADF - The mqdes argument is not a valid message queue descriptor.
+ */
+int mq_close( mqd_t mqdes );
+
+/**
+ * @brief Get message queue attributes.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/mq_getattr.html
+ *
+ * @retval 0 - Upon successful completion
+ * @retval -1 - A error occurred. errno is also set.
+ *
+ * @sideeffect Possible errno values
+ * <br>
+ * DBADF - The mqdes argument is not a valid message queue descriptor.
+ */
+int mq_getattr( mqd_t mqdes,
+                struct mq_attr * mqstat );
+
+/**
+ * @brief Open a message queue.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/mq_open.html
+ *
+ * @note Supported name pattern: leading &lt;slash&gt; character in name is always required;
+ * the maximum length (excluding null-terminator) of the name argument can be NAME_MAX.
+ * The default value of NAME_MAX in FreeRTOS_POSIX_portable_default.h is 64, which can be
+ * overwritten by user.
+ * @note mode argument is not supported.
+ * @note Supported oflags: O_RDWR, O_CREAT, O_EXCL, and O_NONBLOCK.
+ *
+ * @retval Message queue descriptor -- Upon successful completion
+ * @retval (mqd_t) - 1 -- An error occurred. errno is also set.
+ *
+ * @sideeffect Possible errno values
+ * <br>
+ * EINVAL - name argument is invalid (not following name pattern),
+ * OR if O_CREAT is specified in oflag with attr argument not NULL and either mq_maxmsg or mq_msgsize is equal to or less than zero,
+ * OR either O_CREAT or O_EXCL is not set and a queue with the same name is unlinked but pending to be removed.
+ * <br>
+ * EEXIST - O_CREAT and O_EXCL are set and the named message queue already exists.
+ * <br>
+ * ENOSPC - There is insufficient space for the creation of the new message queue.
+ * <br>
+ * ENOENT - O_CREAT is not set and the named message queue does not exist.
+ */
+mqd_t mq_open( const char * name,
+               int oflag,
+               mode_t mode,
+               struct mq_attr * attr );
+
+/**
+ * @brief Receive a message from a message queue.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/mq_receive.html
+ *
+ * @note msg_prio argument is not supported. Messages are not checked for corruption.
+ *
+ * @retval The length of the selected message in bytes - Upon successful completion.
+ * The message is removed from the queue
+ * @retval -1 - An error occurred. errno is also set.
+ *
+ * @sideeffect Possible errno values
+ * <br>
+ * EBADF - The mqdes argument is not a valid message queue descriptor open for reading.
+ * <br>
+ * EMSGSIZE - The specified message buffer size, msg_len, is less than the message size attribute of the message queue.
+ * <br>
+ * ETIMEDOUT - The O_NONBLOCK flag was not set when the message queue was opened,
+ * but no message arrived on the queue before the specified timeout expired.
+ * <br>
+ * EAGAIN - O_NONBLOCK was set in the message description associated with mqdes, and the specified message queue is empty.
+ */
+ssize_t mq_receive( mqd_t mqdes,
+                    char * msg_ptr,
+                    size_t msg_len,
+                    unsigned int * msg_prio );
+
+/**
+ * @brief Send a message to a message queue.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/mq_send.html
+ *
+ * @note msg_prio argument is not supported.
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval -1 - An error occurred. errno is also set.
+ *
+ * @sideeffect Possible errno values
+ * <br>
+ * EBADF - The mqdes argument is not a valid message queue descriptor open for writing.
+ * <br>
+ * EMSGSIZE - The specified message length, msg_len, exceeds the message size attribute of the message queue,
+ * OR insufficient memory for the message to be sent.
+ * <br>
+ * ETIMEDOUT - The O_NONBLOCK flag was not set when the message queue was opened,
+ * but the timeout expired before the message could be added to the queue.
+ * <br>
+ * EAGAIN - The O_NONBLOCK flag is set in the message queue description associated with mqdes,
+ * and the specified message queue is full.
+ */
+int mq_send( mqd_t mqdes,
+             const char * msg_ptr,
+             size_t msg_len,
+             unsigned msg_prio );
+
+/**
+ * @brief Receive a message from a message queue with timeout.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/mq_timedreceive.html
+ *
+ * @note msg_prio argument is not supported. Messages are not checked for corruption.
+ *
+ * @retval The length of the selected message in bytes - Upon successful completion.
+ * The message is removed from the queue
+ * @retval -1 - An error occurred. errno is also set.
+ *
+ * @sideeffect Possible errno values
+ * <br>
+ * EBADF - The mqdes argument is not a valid message queue descriptor open for reading.
+ * <br>
+ * EMSGSIZE - The specified message buffer size, msg_len, is less than the message size attribute of the message queue.
+ * <br>
+ * EINVAL - The process or thread would have blocked, and the abstime parameter specified a nanoseconds field value
+ * less than zero or greater than or equal to 1000 million.
+ * <br>
+ * ETIMEDOUT - The O_NONBLOCK flag was not set when the message queue was opened,
+ * but no message arrived on the queue before the specified timeout expired.
+ * <br>
+ * EAGAIN - O_NONBLOCK was set in the message description associated with mqdes, and the specified message queue is empty.
+ */
+ssize_t mq_timedreceive( mqd_t mqdes,
+                         char * msg_ptr,
+                         size_t msg_len,
+                         unsigned * msg_prio,
+                         const struct timespec * abstime );
+
+/**
+ * @brief Send a message to a message queue with timeout.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/mq_timedsend.html
+ *
+ * @note msg_prio argument is not supported.
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval -1 - An error occurred. errno is also set.
+ *
+ * @sideeffect Possible errno values
+ * <br>
+ * EBADF - The mqdes argument is not a valid message queue descriptor open for writing.
+ * <br>
+ * EMSGSIZE - The specified message length, msg_len, exceeds the message size attribute of the message queue,
+ * OR insufficient memory for the message to be sent.
+ * <br>
+ * EINVAL - The process or thread would have blocked, and the abstime parameter specified a nanoseconds field
+ * value less than zero or greater than or equal to 1000 million.
+ * <br>
+ * ETIMEDOUT - The O_NONBLOCK flag was not set when the message queue was opened,
+ * but the timeout expired before the message could be added to the queue.
+ * <br>
+ * EAGAIN - The O_NONBLOCK flag is set in the message queue description associated with mqdes,
+ * and the specified message queue is full.
+ */
+int mq_timedsend( mqd_t mqdes,
+                  const char * msg_ptr,
+                  size_t msg_len,
+                  unsigned msg_prio,
+                  const struct timespec * abstime );
+
+/**
+ * @brief Remove a message queue.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/mq_unlink.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval -1 - An error occurred. errno is also set.
+ *
+ * @sideeffect Possible errno values
+ * <br>
+ * EINVAL - name argument is invalid. Refer to requirements on name argument in mq_open().
+ * <br>
+ * ENOENT - The named message queue does not exist.
+ */
+int mq_unlink( const char * name );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef _FREERTOS_POSIX_MQUEUE_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX/pthread.h

@@ -0,0 +1,509 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file pthread.h
+ * @brief Threads.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/pthread.h.html
+ */
+
+#ifndef _FREERTOS_POSIX_PTHREAD_H_
+#define _FREERTOS_POSIX_PTHREAD_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* FreeRTOS+POSIX includes. POSIX states that this header shall make symbols
+ * defined in sched.h and time.h visible. */
+#include "FreeRTOS_POSIX/sched.h"
+#include "FreeRTOS_POSIX/time.h"
+
+/**
+ * @name pthread detach state.
+ */
+/**@{ */
+#define PTHREAD_CREATE_DETACHED    0       /**< Detached. */
+#define PTHREAD_CREATE_JOINABLE    1       /**< Joinable (default). */
+/**@} */
+
+/**
+ * @name Returned to a single thread after a successful pthread_barrier_wait.
+ *
+ * @brief POSIX specifies that "The constant PTHREAD_BARRIER_SERIAL_THREAD is defined in
+ * <pthread.h> and its value shall be distinct from any other value returned by pthread_barrier_wait()."
+ * So it's defined as negative to distinguish it from the errnos, which are positive.
+ */
+#define PTHREAD_BARRIER_SERIAL_THREAD    ( -2 )
+
+/**
+ * @name Mutex types.
+ */
+/**@{ */
+#ifndef PTHREAD_MUTEX_NORMAL
+    #define PTHREAD_MUTEX_NORMAL        0                        /**< Non-robust, deadlock on relock, does not remember owner. */
+#endif
+#ifndef PTHREAD_MUTEX_ERRORCHECK
+    #define PTHREAD_MUTEX_ERRORCHECK    1                        /**< Non-robust, error on relock,  remembers owner. */
+#endif
+#ifndef PTHREAD_MUTEX_RECURSIVE
+    #define PTHREAD_MUTEX_RECURSIVE     2                        /**< Non-robust, recursive relock, remembers owner. */
+#endif
+#ifndef PTHREAD_MUTEX_DEFAULT
+    #define PTHREAD_MUTEX_DEFAULT       PTHREAD_MUTEX_NORMAL     /**< PTHREAD_MUTEX_NORMAL (default). */
+#endif
+/**@} */
+
+/**
+ * @name Compile-time initializers.
+ *
+ * @brief To use PTHREAD_COND_INITIALIZER, posixconfigENABLE_PTHREAD_COND_T needs to be set to 1
+ * in port specific POSIX config file.
+ *
+ * To use PTHREAD_MUTEX_INITIALIZER, posixconfigENABLE_PTHREAD_MUTEX_T needs to be set to 1 in
+ * port specific POSIX config file.
+ */
+/**@{ */
+#if posixconfigENABLE_PTHREAD_COND_T == 1
+    #define PTHREAD_COND_INITIALIZER    FREERTOS_POSIX_COND_INITIALIZER       /**< pthread_cond_t. */
+#endif
+
+#if posixconfigENABLE_PTHREAD_MUTEX_T == 1
+    #define PTHREAD_MUTEX_INITIALIZER    FREERTOS_POSIX_MUTEX_INITIALIZER /**< pthread_mutex_t. */
+#endif
+
+/**@} */
+
+/**
+ * @brief Destroy the thread attributes object.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_attr_destroy.html
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int pthread_attr_destroy( pthread_attr_t * attr );
+
+/**
+ * @brief Get detachstate attribute.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_attr_getdetachstate.html
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int pthread_attr_getdetachstate( const pthread_attr_t * attr,
+                                 int * detachstate );
+
+/**
+ * @brief Get schedparam attribute.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_attr_getschedparam.html
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int pthread_attr_getschedparam( const pthread_attr_t * attr,
+                                struct sched_param * param );
+
+/**
+ * @brief Get stacksize attribute.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_attr_getstacksize.html
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int pthread_attr_getstacksize( const pthread_attr_t * attr,
+                               size_t * stacksize );
+
+/**
+ * @brief Initialize the thread attributes object.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_attr_init.html
+ *
+ * @retval 0 - Upon successful completion.
+ *
+ * @note Currently, only stack size, sched_param, and detach state attributes
+ * are supported. Also see pthread_attr_get*() and pthread_attr_set*().
+ */
+int pthread_attr_init( pthread_attr_t * attr );
+
+/**
+ * @brief Set detachstate attribute.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_attr_setdetachstate.html
+ *
+ * @retval 0 - Upon successful completion
+ * @retval EINVAL - The value of detachstate is not valid. Currently, supported detach states are --
+ *                  PTHREAD_CREATE_DETACHED and PTHREAD_CREATE_JOINABLE.
+ */
+int pthread_attr_setdetachstate( pthread_attr_t * attr,
+                                 int detachstate );
+
+/**
+ * @brief Set schedparam attribute.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_attr_setschedparam.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval EINVAL - The value of param is not valid.
+ * @retval ENOTSUP - An attempt was made to set the attribute to an unsupported value.
+ */
+int pthread_attr_setschedparam( pthread_attr_t * attr,
+                                const struct sched_param * param );
+
+/**
+ * @brief Set the schedpolicy attribute.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_attr_setschedpolicy.html
+ *
+ * @retval 0 - Upon successful completion.
+ *
+ * @warning This function is a stub and always returns 0.
+ */
+int pthread_attr_setschedpolicy( pthread_attr_t * attr,
+                                 int policy );
+
+/**
+ * @brief Set stacksize attribute.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_attr_setstacksize.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval EINVAL - The value of stacksize is less than {PTHREAD_STACK_MIN}.
+ */
+int pthread_attr_setstacksize( pthread_attr_t * attr,
+                               size_t stacksize );
+
+/**
+ * @brief Destroy a barrier object.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_barrier_destroy.html
+ *
+ * @retval 0 - Upon successful completion.
+ *
+ * @note This function does not validate whether there is any thread blocking on the barrier before destroying.
+ */
+int pthread_barrier_destroy( pthread_barrier_t * barrier );
+
+/**
+ * @brief Initialize a barrier object.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_barrier_init.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval EINVAL - The value specified by count is equal to zero.
+ * @retval ENOMEM - count cannot fit into FreeRTOS event group type OR insufficient memory exists to initialize the barrier.
+ *
+ * @note attr is ignored.
+ *
+ * @note pthread_barrier_init() is implemented with FreeRTOS event group.
+ * To ensure count fits in event group, count may be at most 8 when configUSE_16_BIT_TICKS is 1;
+ * it may be at most 24 otherwise. configUSE_16_BIT_TICKS is configured in application FreeRTOSConfig.h
+ * file, which defines how many bits tick count type has. See further details and limitation about event
+ * group and configUSE_16_BIT_TICKS in FreeRTOS site.
+ */
+int pthread_barrier_init( pthread_barrier_t * barrier,
+                          const pthread_barrierattr_t * attr,
+                          unsigned count );
+
+/**
+ * @brief Synchronize at a barrier.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_barrier_wait.html
+ *
+ * @retval PTHREAD_BARRIER_SERIAL_THREAD - Upon successful completion, the first thread.
+ * @retval 0 - Upon successful completion, other thread(s).
+ */
+int pthread_barrier_wait( pthread_barrier_t * barrier );
+
+/**
+ * @brief Thread creation.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_create.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval EAGAIN - Insufficient memory for either thread structure or task creation.
+ */
+int pthread_create( pthread_t * thread,
+                    const pthread_attr_t * attr,
+                    void *( *startroutine )( void * ),
+                    void * arg );
+
+/**
+ * @brief Broadcast a condition.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_cond_broadcast.html
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int pthread_cond_broadcast( pthread_cond_t * cond );
+
+/**
+ * @brief Destroy condition variables.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_cond_destroy.html
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int pthread_cond_destroy( pthread_cond_t * cond );
+
+/**
+ * @brief Initialize condition variables.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_cond_init.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval ENOMEM - Insufficient memory exists to initialize the condition variable.
+ *
+ * @note attr is ignored and treated as NULL. Default setting is always used.
+ */
+int pthread_cond_init( pthread_cond_t * cond,
+                       const pthread_condattr_t * attr );
+
+/**
+ * @brief Signal a condition.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_cond_signal.html
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int pthread_cond_signal( pthread_cond_t * cond );
+
+/**
+ * @brief Wait on a condition with a timeout.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_cond_timedwait.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval EINVAL - The abstime argument passed in does not refer to an initialized structure OR
+ *                  the abstime parameter specified a nanoseconds field value less than zero or
+ *                  greater than or equal to 1000 million.
+ * @retval ETIMEDOUT - The time specified by abstime to pthread_cond_timedwait() has passed.
+ */
+int pthread_cond_timedwait( pthread_cond_t * cond,
+                            pthread_mutex_t * mutex,
+                            const struct timespec * abstime );
+
+/**
+ * @brief Wait on a condition.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_cond_wait.html
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int pthread_cond_wait( pthread_cond_t * cond,
+                       pthread_mutex_t * mutex );
+
+/**
+ * @brief Compare thread IDs.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_equal.html
+ *
+ * @retval 0 - t1 and t2 are both not NULL && equal.
+ * @retval non-zero - otherwise.
+ */
+int pthread_equal( pthread_t t1,
+                   pthread_t t2 );
+
+/**
+ * @brief Thread termination.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_exit.html
+ *
+ * @retval void - this function cannot return to its caller.
+ */
+void pthread_exit( void * value_ptr );
+
+/**
+ * @brief Dynamic thread scheduling parameters access.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_getschedparam.html
+ *
+ * @retval 0 - Upon successful completion.
+ *
+ * @note policy is always set to SCHED_OTHER by this function.
+ */
+int pthread_getschedparam( pthread_t thread,
+                           int * policy,
+                           struct sched_param * param );
+
+/**
+ * @brief Wait for thread termination.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_join.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval EDEADLK - The value specified by the thread argument to pthread_join() does not refer
+ *                   to a joinable thread OR multiple simultaneous calls to pthread_join()
+ *                   specifying the same target thread OR the value specified by the thread argument
+ *                   to pthread_join() refers to the calling thread.
+ */
+int pthread_join( pthread_t thread,
+                  void ** retval );
+
+/**
+ * @brief Destroy a mutex.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutex_destroy.html
+ *
+ * @retval 0 - Upon successful completion.
+ *
+ * @note If there exists a thread holding this mutex, this function returns 0 with mutex not being destroyed.
+ */
+int pthread_mutex_destroy( pthread_mutex_t * mutex );
+
+/**
+ * @brief Initialize a mutex.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutex_init.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval ENOMEM - Insufficient memory exists to initialize the mutex structure.
+ * @retval EAGAIN - Unable to initialize the mutex structure member(s).
+ */
+int pthread_mutex_init( pthread_mutex_t * mutex,
+                        const pthread_mutexattr_t * attr );
+
+/**
+ * @brief Lock a mutex.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutex_lock.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval EINVAL - the abstime parameter specified a nanoseconds field value less than zero
+ *                  or greater than or equal to 1000 million.
+ * @retval EDEADLK - The mutex type is PTHREAD_MUTEX_ERRORCHECK and the current thread already
+ *                   owns the mutex.
+ */
+int pthread_mutex_lock( pthread_mutex_t * mutex );
+
+/**
+ * @brief Lock a mutex with timeout.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutex_timedlock.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval EINVAL - The abstime argument passed in does not refer to an initialized structure OR
+ *                  the abstime parameter specified a nanoseconds field value less than zero or
+ *                  greater than or equal to 1000 million.
+ * @retval EDEADLK - The mutex type is PTHREAD_MUTEX_ERRORCHECK and the current thread already owns the mutex.
+ * @retval ETIMEDOUT - The mutex could not be locked before the specified timeout expired.
+ */
+int pthread_mutex_timedlock( pthread_mutex_t * mutex,
+                             const struct timespec * abstime );
+
+/**
+ * @brief Attempt to lock a mutex. Fail immediately if mutex is already locked.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutex_trylock.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval EINVAL - the abstime parameter specified a nanoseconds field value less than zero
+ *                  or greater than or equal to 1000 million.
+ * @retval EDEADLK - The mutex type is PTHREAD_MUTEX_ERRORCHECK and the current thread already
+ *                   owns the mutex.
+ * @retval EBUSY - The mutex could not be acquired because it was already locked.
+ */
+int pthread_mutex_trylock( pthread_mutex_t * mutex );
+
+/**
+ * @brief Unlock a mutex.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutex_unlock.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval EPERM - The mutex type is PTHREAD_MUTEX_ERRORCHECK or PTHREAD_MUTEX_RECURSIVE, and
+ *                 the current thread does not own the mutex.
+ */
+int pthread_mutex_unlock( pthread_mutex_t * mutex );
+
+/**
+ * @brief Destroy the mutex attributes object.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutexattr_destroy.html
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int pthread_mutexattr_destroy( pthread_mutexattr_t * attr );
+
+/**
+ * @brief Get the mutex type attribute.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutexattr_gettype.html
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int pthread_mutexattr_gettype( const pthread_mutexattr_t * attr,
+                               int * type );
+
+/**
+ * @brief Initialize the mutex attributes object.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutexattr_init.html
+ *
+ * @retval 0 - Upon successful completion.
+ *
+ * @note Currently, only the type attribute is supported. Also see pthread_mutexattr_settype()
+ *       and pthread_mutexattr_gettype().
+ */
+int pthread_mutexattr_init( pthread_mutexattr_t * attr );
+
+/**
+ * @brief Set the mutex type attribute.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutexattr_settype.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval EINVAL - The value type is invalid.
+ */
+int pthread_mutexattr_settype( pthread_mutexattr_t * attr,
+                               int type );
+
+/**
+ * @brief Get the calling thread ID.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_self.html
+ *
+ * @retval the thread ID of the calling thread.
+ */
+pthread_t pthread_self( void );
+
+/**
+ * @brief Dynamic thread scheduling parameters access.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_setschedparam.html
+ *
+ * @note policy is ignored; only priority (param.sched_priority) may be changed.
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int pthread_setschedparam( pthread_t thread,
+                           int policy,
+                           const struct sched_param * param );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _FREERTOS_POSIX_PTHREAD_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX/sched.h

@@ -0,0 +1,92 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file sched.h
+ * @brief Execution scheduling.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sched.h.html
+ */
+
+#ifndef _FREERTOS_POSIX_SCHED_H_
+#define _FREERTOS_POSIX_SCHED_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @name Scheduling Policies
+ */
+/**@{ */
+#define SCHED_OTHER    0    /**< Another scheduling policy. */
+/**@} */
+
+/**
+ * @brief Scheduling parameters required for implementation of each supported
+ * scheduling policy.
+ */
+struct sched_param
+{
+    int sched_priority; /**< Process or thread execution scheduling priority. */
+};
+
+/**
+ * @brief Get priority limit (max).
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/sched_get_priority_max.html
+ *
+ * @note policy is ignored.
+ *
+ * @return the maximum priority value (0-based) system configuration allows.
+ * <br>
+ * e.g. if configMAX_PRIORITIES == 7, this function returns (configMAX_PRIORITIES - 1).
+ * configMAX_PRIORITIES is configured in application FreeRTOSConfig.h file.
+ */
+int sched_get_priority_max( int policy );
+
+/**
+ * @brief Get priority limit (min).
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/sched_get_priority_min.html
+ *
+ * @note policy is ignored.
+ */
+int sched_get_priority_min( int policy );
+
+/**
+ * @brief Yield the processor.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/sched_yield.html
+ *
+ * @retval 0 - Upon successful completion
+ */
+int sched_yield( void );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef _FREERTOS_POSIX_SCHED_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX/semaphore.h

@@ -0,0 +1,151 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file semaphore.h
+ * @brief Semaphores.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/semaphore.h.html
+ */
+
+#ifndef _FREERTOS_POSIX_SEMAPHORE_H_
+#define _FREERTOS_POSIX_SEMAPHORE_H_
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX/time.h"
+#include "FreeRTOS_POSIX_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Semaphore type.
+ */
+typedef PosixSemType_t sem_t;
+
+/**
+ * @brief Destroy an unnamed semaphore.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_destroy.html
+ *
+ * @retval 0 - upon successful completion
+ *
+ * @note Semaphore is destroyed regardless of whether there is any thread currently blocked on this semaphore.
+ */
+int sem_destroy( sem_t * sem );
+
+/**
+ * @brief Get the value of a semaphore.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_getvalue.html
+ *
+ * @retval 0 - Upon successful completion
+ *
+ * @note If sem is locked, then the object to which sval points is set to zero.
+ */
+int sem_getvalue( sem_t * sem,
+                  int * sval );
+
+/**
+ * @brief Initialize an unnamed semaphore.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_init.html
+ *
+ * @note pshared is ignored. Semaphores will always be considered "shared".
+ *
+ * @retval 0 - upon successful completion
+ * @retval -1 - otherwise. System error variable errno is also set in this case.
+ *
+ * @sideeffect Possible errno values
+ * <br>
+ * EINVAL -  The value argument exceeds {SEM_VALUE_MAX}.
+ * <br>
+ * ENOSPC - A resource required to initialize the semaphore has been exhausted.
+ */
+int sem_init( sem_t * sem,
+              int pshared,
+              unsigned value );
+
+/**
+ * @brief Unlock a semaphore.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_post.html
+ *
+ * @retval 0 - upon successful completion
+ */
+int sem_post( sem_t * sem );
+
+/**
+ * @brief Lock a semaphore with timeout.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_timedwait.html
+ *
+ * @retval 0 - upon successful completion
+ * @retval -1 - otherwise. System error variable errno is also set in this case.
+ *
+ * @sideeffect Possible errno values
+ * <br>
+ * EINVAL - parameter specified a nanoseconds field value less than zero or greater
+ * than or equal to 1000 million
+ * <br>
+ * ETIMEDOUT - The semaphore could not be locked before the specified timeout expired.
+ *
+ * @note Deadlock detection is not implemented.
+ */
+int sem_timedwait( sem_t * sem,
+                   const struct timespec * abstime );
+
+/**
+ * @brief Lock a semaphore if available.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_trywait.html
+ *
+ * @retval 0 - upon successful completion
+ * @retval -1 - otherwise. System error variable errno is also set in this case.
+ *
+ * @sideeffect Possible errno values
+ * <br>
+ * EAGAIN - The semaphore was already locked, so it cannot be immediately locked by the sem_trywait() operation.
+ */
+int sem_trywait( sem_t * sem );
+
+/**
+ * @brief Lock a semaphore.
+ *
+ * @see http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_wait.html
+ *
+ * @retval 0 - upon successful completion
+ * @retval -1 - otherwise. System error variable errno is also set in this case.
+ *
+ * @note Deadlock detection is not implemented.
+ */
+int sem_wait( sem_t * sem );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef _FREERTOS_POSIX_SEMAPHORE_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX/signal.h

@@ -0,0 +1,78 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file signal.h
+ * @brief Signals.
+ *
+ * Signals are currently not implemented in FreeRTOS+POSIX. This header only
+ * defines the signal data structures used elsewhere.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/signal.h.html
+ */
+
+
+#ifndef _FREERTOS_POSIX_SIGNAL_H_
+#define _FREERTOS_POSIX_SIGNAL_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @name Values of sigev_notify.
+ */
+/**@{ */
+#define SIGEV_NONE      0 /**< No asynchronous notification is delivered when the event of interest occurs. */
+#define SIGEV_SIGNAL    1 /**< A queued signal, with an application-defined value, is generated when the event of interest occurs. Not supported. */
+#define SIGEV_THREAD    2 /**< A notification function is called to perform notification. */
+/**@} */
+
+/**
+ * @brief Signal value.
+ */
+union sigval
+{
+    int sival_int;    /**< Integer signal value. */
+    void * sival_ptr; /**< Pointer signal value. */
+};
+
+/**
+ * @brief Signal event structure.
+ */
+struct sigevent
+{
+    int sigev_notify;                                 /**< Notification type. A value of SIGEV_SIGNAL is not supported. */
+    int sigev_signo;                                  /**< Signal number. This member is ignored. */
+    union sigval sigev_value;                         /**< Signal value. Only the sival_ptr member is used. */
+    void ( * sigev_notify_function )( union sigval ); /**< Notification function. */
+    pthread_attr_t * sigev_notify_attributes;         /**< Notification attributes. */
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef _FREERTOS_POSIX_SIGNAL_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX/sys/types.h

@@ -0,0 +1,199 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file sys/types.h
+ * @brief Data types.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_types.h.html
+ */
+
+#ifndef _FREERTOS_POSIX_TYPES_H_
+#define _FREERTOS_POSIX_TYPES_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* C standard library includes. */
+#include <stdint.h>
+
+/* FreeRTOS types include */
+#include "FreeRTOS_POSIX_types.h"
+
+/**
+ * @brief Used for system times in clock ticks or CLOCKS_PER_SEC.
+ *
+ * Enabled/disabled by posixconfigENABLE_CLOCK_T.
+ */
+#if !defined( posixconfigENABLE_CLOCK_T ) || ( posixconfigENABLE_CLOCK_T == 1 )
+    typedef uint32_t                 clock_t;
+#endif
+
+/**
+ * @brief Used for clock ID type in the clock and timer functions.
+ *
+ * Enabled/disabled by posixconfigENABLE_CLOCKID_T.
+ */
+#if !defined( posixconfigENABLE_CLOCKID_T ) || ( posixconfigENABLE_CLOCKID_T == 1 )
+    typedef int                      clockid_t;
+#endif
+
+/**
+ * @brief Used for some file attributes.
+ *
+ * Enabled/disabled by posixconfigENABLE_MODE_T.
+ */
+#if !defined( posixconfigENABLE_MODE_T ) || ( posixconfigENABLE_MODE_T == 1 )
+    typedef int                      mode_t;
+#endif
+
+/**
+ * @brief Used for process IDs and process group IDs.
+ *
+ * Enabled/disabled by posixconfigENABLE_PID_T.
+ */
+#if !defined( posixconfigENABLE_PID_T ) || ( posixconfigENABLE_PID_T == 1 )
+    typedef int                      pid_t;
+#endif
+
+/**
+ * @brief Used to identify a thread attribute object.
+ *
+ * Enabled/disabled by posixconfigENABLE_PTHREAD_ATTR_T.
+ */
+#if !defined( posixconfigENABLE_PTHREAD_ATTR_T ) || ( posixconfigENABLE_PTHREAD_ATTR_T == 1 )
+    typedef PthreadAttrType_t        pthread_attr_t;
+#endif
+
+/**
+ * @brief Used to identify a barrier.
+ *
+ * Enabled/disabled by posixconfigENABLE_PTHREAD_BARRIER_T.
+ */
+#if !defined( posixconfigENABLE_PTHREAD_BARRIER_T ) || ( posixconfigENABLE_PTHREAD_BARRIER_T == 1 )
+    typedef PthreadBarrierType_t     pthread_barrier_t;
+#endif
+
+/**
+ * @brief Used to define a barrier attributes object.
+ */
+typedef void                         * pthread_barrierattr_t;
+
+/**
+ * @brief Used for condition variables.
+ *
+ * Enabled/disabled by posixconfigENABLE_PTHREAD_COND_T.
+ */
+#if !defined( posixconfigENABLE_PTHREAD_COND_T ) || ( posixconfigENABLE_PTHREAD_COND_T == 1 )
+    typedef  PthreadCondType_t       pthread_cond_t;
+#endif
+
+/**
+ * @brief Used to identify a condition attribute object.
+ *
+ * Enabled/disabled by posixconfigENABLE_PTHREAD_CONDATTR_T.
+ */
+#if !defined( posixconfigENABLE_PTHREAD_CONDATTR_T ) || ( posixconfigENABLE_PTHREAD_CONDATTR_T == 1 )
+    typedef void                     * pthread_condattr_t;
+#endif
+
+/**
+ * @brief Used for mutexes.
+ *
+ * Enabled/disabled by posixconfigENABLE_PTHREAD_MUTEX_T.
+ */
+#if !defined( posixconfigENABLE_PTHREAD_MUTEX_T ) || ( posixconfigENABLE_PTHREAD_MUTEX_T == 1 )
+    typedef PthreadMutexType_t       pthread_mutex_t;
+#endif
+
+/**
+ * @brief Used to identify a mutex attribute object.
+ *
+ * Enabled/disabled by posixconfigENABLE_PTHREAD_MUTEXATTR_T.
+ */
+#if !defined( posixconfigENABLE_PTHREAD_MUTEXATTR_T ) || ( posixconfigENABLE_PTHREAD_MUTEXATTR_T == 1 )
+    typedef PthreadMutexAttrType_t   pthread_mutexattr_t;
+#endif
+
+/**
+ * @brief Used to identify a thread.
+ *
+ * Enabled/disabled by posixconfigENABLE_PTHREAD_T.
+ */
+#if !defined( posixconfigENABLE_PTHREAD_T ) || ( posixconfigENABLE_PTHREAD_T == 1 )
+    typedef void                     * pthread_t;
+#endif
+
+/**
+ * @brief Used for a count of bytes or an error indication.
+ *
+ * Enabled/disabled by posixconfigENABLE_SSIZE_T.
+ */
+#if !defined( posixconfigENABLE_SSIZE_T ) || ( posixconfigENABLE_SSIZE_T == 1 )
+    typedef int                      ssize_t;
+#endif
+
+/**
+ * @brief Used for time in seconds.
+ *
+ * Enabled/disabled by posixconfigENABLE_TIME_T.
+ */
+#if !defined( posixconfigENABLE_TIME_T ) || ( posixconfigENABLE_TIME_T == 1 )
+    typedef int64_t                  time_t;
+#endif
+
+/**
+ * @brief Used for timer ID returned by timer_create().
+ *
+ * Enabled/disabled by posixconfigENABLE_TIMER_T.
+ */
+#if !defined( posixconfigENABLE_TIMER_T ) || ( posixconfigENABLE_TIMER_T == 1 )
+    typedef void                     * timer_t;
+#endif
+
+/**
+ * @brief Used for time in microseconds.
+ *
+ * Enabled/disabled by posixconfigENABLE_USECONDS_T.
+ */
+#if !defined( posixconfigENABLE_USECONDS_T ) || ( posixconfigENABLE_USECONDS_T == 1 )
+    typedef unsigned long            useconds_t;
+#endif
+
+/**
+ * @brief Used for file sizes.
+ *
+ * Enabled/disabled by posixconfigENABLE_OFF_T.
+ */
+#if !defined( posixconfigENABLE_OFF_T ) || ( posixconfigENABLE_OFF_T == 1 )
+    typedef long int                 off_t;
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef _FREERTOS_POSIX_TYPES_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX/time.h

@@ -0,0 +1,266 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file time.h
+ * @brief Time types.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/time.h.html
+ */
+
+#ifndef _FREERTOS_POSIX_TIME_H_
+#define _FREERTOS_POSIX_TIME_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX/sys/types.h"
+#include "FreeRTOS_POSIX/signal.h"
+
+/**
+ * @name Unit conversion constants.
+ */
+/**@{ */
+#define MICROSECONDS_PER_SECOND    ( 1000000LL )                                   /**< Microseconds per second. */
+#define NANOSECONDS_PER_SECOND     ( 1000000000LL )                                /**< Nanoseconds per second. */
+#define NANOSECONDS_PER_TICK       ( NANOSECONDS_PER_SECOND / configTICK_RATE_HZ ) /**< Nanoseconds per FreeRTOS tick. */
+/**@} */
+
+/**
+ * @name Clock identifiers.
+ */
+/**@{ */
+#define CLOCK_REALTIME     0     /**< The identifier of the system-wide clock measuring real time. */
+#define CLOCK_MONOTONIC    1     /**< The identifier for the system-wide monotonic clock.*/
+/**@} */
+
+/**
+ * @name A number used to convert the value returned by the clock() function into seconds.
+ */
+/**@{ */
+#define CLOCKS_PER_SEC    ( ( clock_t ) configTICK_RATE_HZ )
+/**@} */
+
+/**
+ * @name Flag indicating time is absolute.
+ *
+ * For functions taking timer objects, this refers to the clock associated with the timer.
+ */
+/**@{ */
+#define TIMER_ABSTIME    0x01
+/**@} */
+
+#if !defined( posixconfigENABLE_TIMESPEC ) || ( posixconfigENABLE_TIMESPEC == 1 )
+
+/**
+ * @brief represents an elapsed time
+ */
+    struct timespec
+    {
+        time_t tv_sec; /**< Seconds. */
+        long tv_nsec;  /**< Nanoseconds. */
+    };
+#endif
+
+#if !defined( posixconfigENABLE_ITIMERSPEC ) || ( posixconfigENABLE_ITIMERSPEC == 1 )
+
+/**
+ * @brief timer
+ */
+    struct itimerspec
+    {
+        struct timespec it_interval; /**< Timer period. */
+        struct timespec it_value;    /**< Timer expiration. */
+    };
+#endif
+
+/**
+ * @brief Report CPU time used.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/clock.html
+ *
+ * @return  The number of FreeRTOS ticks since the scheduler
+ * was started minus the ticks spent in the idle task.
+ *
+ * @note This function does NOT report the number of ticks spent by the calling thread.
+ */
+clock_t clock( void );
+
+/**
+ * @brief Access a process CPU-time clock.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_getcpuclockid.html
+ *
+ * @retval EPERM
+ *
+ * @note This function is currently unsupported.
+ *
+ */
+int clock_getcpuclockid( pid_t pid,
+                         clockid_t * clock_id );
+
+/**
+ * @brief Returns the resolution of a clock.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_getres.html
+ *
+ * @note clock_id is ignored
+ * @note This function stores the resolution of the FreeRTOS tick count in the object res points to.
+ *
+ * @retval 0 - Upon successful execution
+ */
+int clock_getres( clockid_t clock_id,
+                  struct timespec * res );
+
+/**
+ * @brief Returns the current value for the specified clock, clock_id.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_gettime.html
+ *
+ * @note clock_id is ignored
+ * @note  this function does not check for overflows of time_t.
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int clock_gettime( clockid_t clock_id,
+                   struct timespec * tp );
+
+/**
+ * @brief High resolution sleep with specifiable clock.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_nanosleep.html
+ *
+ * @note clock_id is ignored, as this function uses the FreeRTOS tick count as its clock.
+ * @note flags is ignored, if INCLUDE_vTaskDelayUntil is 0. i.e. the FreeRTOS function vTaskDelayUntil isn't available.
+ * @note rmtp is also ignored, as signals are not implemented.
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval EINVAL - The rqtp argument specified a nanosecond value less than zero or greater than or equal to 1000 million.
+ */
+int clock_nanosleep( clockid_t clock_id,
+                     int flags,
+                     const struct timespec * rqtp,
+                     struct timespec * rmtp );
+
+/**
+ * @brief Sets the time for the specified clock.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_settime.html
+ *
+ * @retval -1 with errno set to EPERM.
+ *
+ * @note This function is currently unsupported, as FreeRTOS does not provide a function to modify the tick count.
+ */
+int clock_settime( clockid_t clock_id,
+                   const struct timespec * tp );
+
+/**
+ * @brief High resolution sleep.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/nanosleep.html
+ *
+ * @note rmtp is ignored, as signals are not implemented.
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval -1 - The rqtp argument is invalid OR the rqtp argument specified a nanosecond value less than zero or greater than or equal to 1000 million.
+ *
+ */
+int nanosleep( const struct timespec * rqtp,
+               struct timespec * rmtp );
+
+/**
+ * @brief Create a per-process timer.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_create.html
+ *
+ * @note clock_id is ignored, as this function used the FreeRTOS tick count as its clock.
+ * @note evp.sigev_notify must be set to SIGEV_THREAD, since signals are currently not supported.
+ *
+ * @retval 0 - Upon successful completion, with location referenced by timerid updated.
+ * @retval -1 - If an error occurs. errno is also set.
+ *
+ * @sideeffect Possible errno values
+ * <br>
+ * ENOTSUP - If evp is NULL OR evp->sigen_notify == SIGEV_SIGNAL.
+ * <br>
+ * EAGAIN - The system lacks sufficient signal queuing resources to honor the request.
+ */
+int timer_create( clockid_t clockid,
+                  struct sigevent * evp,
+                  timer_t * timerid );
+
+/**
+ * @brief Delete a per-process timer.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_delete.html
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int timer_delete( timer_t timerid );
+
+/**
+ * @brief Get the timer overrun count.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_getoverrun.html
+ *
+ * @retval 0 - Always return 0, since signals are not supported.
+ */
+int timer_getoverrun( timer_t timerid );
+
+/**
+ * @brief Get the amount of time until the timer expires.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_gettime.html
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int timer_gettime( timer_t timerid,
+                   struct itimerspec * value );
+
+/**
+ * @brief Set the time until the next expiration of the timer.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_settime.html
+ *
+ * @retval 0 - Upon successful completion.
+ * @retval -1 - An error occurred, errno is also set.
+ *
+ * @sideeffect Possible errno values
+ * <br>
+ * EINVAL - A value structure specified a nanosecond value less than zero or greater than or equal to 1000 million,
+ * AND the it_value member of that structure did not specify zero seconds and nanoseconds.
+ */
+int timer_settime( timer_t timerid,
+                   int flags,
+                   const struct itimerspec * value,
+                   struct itimerspec * ovalue );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef _FREERTOS_POSIX_TIME_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX/unistd.h

@@ -0,0 +1,69 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file unistd.h
+ * @brief Standard symbolic constants and types
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
+ */
+
+#ifndef _FREERTOS_POSIX_UNISTD_H_
+#define _FREERTOS_POSIX_UNISTD_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "FreeRTOS_POSIX/sys/types.h"
+
+/**
+ * @brief Suspend execution for an interval of time.
+ *
+ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/sleep.html
+ *
+ * @param[in] seconds The number of seconds to suspend execution.
+ *
+ * @retval 0 - Upon successful completion.
+ *
+ * @note Return value of a positive number is not yet supported.
+ */
+unsigned sleep( unsigned seconds );
+
+/**
+ * @brief Suspend execution for microsecond intervals.
+ *
+ * This is a useful, non-POSIX function.
+ * @param[in] usec The number of microseconds to suspend execution.
+ *
+ * @retval 0 - Upon successful completion.
+ */
+int usleep( useconds_t usec );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef _FREERTOS_POSIX_UNISTD_H_ */

freertos/Source/FreeRTOS-Plus-POSIX/include/FreeRTOS_POSIX/utils.h

@@ -0,0 +1,163 @@
+/*
+ * Amazon FreeRTOS POSIX V1.1.0
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file utils.h
+ * @brief Utility functions used by FreeRTOS+POSIX.
+ */
+
+#ifndef _FREERTOS_POSIX_UTILS_
+#define _FREERTOS_POSIX_UTILS_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* C standard library includes. */
+#include <stdbool.h>
+#include <stdint.h>
+
+/* FreeRTOS+POSIX includes. */
+#include "FreeRTOS_POSIX/time.h"
+
+/**
+ * @brief Calculates the length of pcString, up to xMaxLength.
+ *
+ * @param[in] pcString The string to find the length of.
+ * @param[in] xMaxLength The limit when searching for the end of pcString.
+ *
+ * @return 0 if pcString is NULL; otherwise, the length of pcString or xMaxLength,
+ * whichever is smaller.
+ */
+size_t UTILS_strnlen( const char * const pcString,
+                      size_t xMaxLength );
+
+/**
+ * @brief Calculates the number of ticks between now and a given timespec.
+ *
+ * @param[in] pxAbsoluteTime A time in the future, specified as seconds and
+ * nanoseconds since CLOCK_REALTIME's 0.
+ * @param[in] pxCurrentTime current time, specified as seconds and
+ * nanoseconds.
+ * @param[out] pxResult Where the result of the conversion is stored. The result
+ * is rounded up for fractional ticks.
+ *
+ * @return 0 on success. Otherwise, ETIMEDOUT if pxAbsoluteTime is in the past,
+ * or EINVAL for invalid parameters.
+ */
+int UTILS_AbsoluteTimespecToDeltaTicks( const struct timespec * const pxAbsoluteTime,
+                                        const struct timespec * const pxCurrentTime,
+                                        TickType_t * const pxResult );
+
+/**
+ * @brief Converts a struct timespec to FreeRTOS ticks.
+ *
+ * @param[in] pxTimespec The timespec to convert.
+ * @param[out] Where the result of the conversion is stored. The result is rounded
+ * up for fractional ticks.
+ *
+ * @return 0 on success. Otherwise, EINVAL for invalid parameters.
+ */
+int UTILS_TimespecToTicks( const struct timespec * const pxTimespec,
+                           TickType_t * const pxResult );
+
+/**
+ * @brief Converts an integer value to a timespec.
+ *
+ * @param[in] llSource The value to convert.
+ * @param[out] pxDestination Where to store the converted value.
+ *
+ * @return No return value.
+ */
+void UTILS_NanosecondsToTimespec( int64_t llSource,
+                                  struct timespec * const pxDestination );
+
+/**
+ * @brief Calculates pxResult = x + y.
+ *
+ * @param[in] x The first argument for addition.
+ * @param[in] y The second argument for addition.
+ * @param[out] pxResult Where the result of the calculation is stored.
+ *
+ * @return -1 if any argument was NULL; 1 if result is negative (overflow); otherwise, 0.
+ */
+int UTILS_TimespecAdd( const struct timespec * const x,
+                       const struct timespec * const y,
+                       struct timespec * const pxResult );
+
+/**
+ * @brief Calculates pxResult = x + ( struct timespec ) nanosec.
+ *
+ * @param[in] x The first argument for addition.
+ * @param[in] llNanoseconds The second argument for addition.
+ * @param[out] pxResult Where the result of the calculation is stored.
+ *
+ * @return -1 if pxResult or x was NULL; 1 if result is negative; otherwise, 0.
+ */
+int UTILS_TimespecAddNanoseconds( const struct timespec * const x,
+                                  int64_t llNanoseconds,
+                                  struct timespec * const pxResult );
+
+/**
+ * @brief Calculates pxResult = x - y. If the result is negative contents of
+ * pResult are undefined
+ *
+ * @param[in] x The first argument for subtraction.
+ * @param[in] y The second argument for subtraction.
+ * @param[out] pxResult Where the result of the calculation is stored.
+ *
+ * @return -1 if any argument was NULL; 1 if result is negative; otherwise, 0.
+ */
+int UTILS_TimespecSubtract( const struct timespec * const x,
+                            const struct timespec * const y,
+                            struct timespec * const pxResult );
+
+/**
+ * @brief Compare  x == y.
+ *
+ * @param[in] x The first argument for comparison.
+ * @param[in] y The second argument for comparison.
+ *
+ * @return 0 if x == y; 1 if x > y; -1 if x < y or any argument was NULL
+ */
+int UTILS_TimespecCompare( const struct timespec * const x,
+                           const struct timespec * const y );
+
+/**
+ * @brief Checks that a timespec conforms to POSIX.
+ *
+ * A valid timespec must have 0 <= tv_nsec < 1000000000.
+ *
+ * @param[in] pxTimespec The timespec to validate.
+ *
+ * @return true if the pxTimespec is valid, false otherwise.
+ */
+bool UTILS_ValidateTimespec( const struct timespec * const pxTimespec );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef _FREERTOS_POSIX_UTILS_ */

freertos/Source/FreeRTOS-Plus-POSIX/include/private/iot_doubly_linked_list.h

@@ -0,0 +1,242 @@
+/*
+ * Amazon FreeRTOS Common V1.0.0
+ * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://aws.amazon.com/freertos
+ * http://www.FreeRTOS.org
+ */
+
+/**
+ * @file iot_doubly_linked_list.h
+ * @brief Doubly Linked List implementation.
+ *
+ * A generic implementation of circular Doubly Linked List which consists of a
+ * list head and some list entries (zero in case of an empty list).
+ *
+ * To start with, a structure of type Link_t should be embedded in the structure
+ * which is to be organized as doubly linked list.
+ * @code
+ * typedef struct UserStruct
+ * {
+ *     uint32_t ulField1;
+ *     uint32_t ulField2;
+ *     Link_t xLink;
+ * } UserStruct_t;
+ * @endcode
+ *
+ * A List head should then be defined and initialized.
+ * @code
+ * Link_t xListHead;
+ * listINIT_HEAD( &xListHead );
+ * @endcode
+ *
+ * listADD can then be used to add nodes to the list.
+ * @code
+ * listADD( &( xListHead ), &( pxUserStruct->xLink ) );
+ * @endcode
+ *
+ * listFOR_EACH can be used for traversing the list.
+ * @code
+ * Link_t *pxLink;
+ * UserStruct_t *pxUserStruct;
+ * listFOR_EACH( pxLink, &( xListHead ) )
+ * {
+ *      pxUserStruct = listCONTAINER( pxLink, UserStruct_t, xLink );
+ * }
+ * @endcode
+ *
+ * listFOR_EACH_SAFE should be used if you want to perform destructive operations
+ * (like free) on nodes while traversing the list.
+ * @code
+ * Link_t *pxLink, *pxTempLink;
+ * UserStruct_t *pxUserStruct;
+ * listFOR_EACH( pxLink, pxTempLink, &( xListHead ) )
+ * {
+ *      pxUserStruct = listCONTAINER( pxLink, UserStruct_t, xLink );
+ *      free( pxUserStruct );
+ * }
+ * @endcode
+ */
+
+#ifndef _AWS_DOUBLY_LINKED_LIST_H_
+#define _AWS_DOUBLY_LINKED_LIST_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+/**
+ * @brief Struct embedded in any struct to make it a doubly linked
+ * list.
+ *
+ * pxNext in the head points to the first node in the list and pxPrev
+ * in the head points to the last node in the list. In case of empty
+ * list, both pxPrev and pxNext in the head point to the head node itself.
+ */
+typedef struct Link
+{
+    struct Link * pxPrev; /**< Pointer to the previous node. */
+    struct Link * pxNext; /**< Pointer to the next node. */
+} Link_t;
+
+/**
+ * @brief Initializes the given list head to an empty list.
+ *
+ * @param[in] pxHead The given list head to initialize.
+ */
+#define listINIT_HEAD( pxHead )          \
+    {                                    \
+        ( pxHead )->pxPrev = ( pxHead ); \
+        ( pxHead )->pxNext = ( pxHead ); \
+    }
+
+/**
+ * @brief Adds the given new node to the given list.
+ *
+ * @param[in] pxHead The head of the given list.
+ * @param[in] pxLink The given new node to be added to the given
+ * list.
+ */
+#define listADD( pxHead, pxLink )                     \
+    {                                                 \
+        Link_t * pxPrevLink = ( pxHead );             \
+        Link_t * pxNextLink = ( ( pxHead )->pxNext ); \
+                                                      \
+        ( pxLink )->pxNext = pxNextLink;              \
+        pxNextLink->pxPrev = ( pxLink );              \
+        pxPrevLink->pxNext = ( pxLink );              \
+        ( pxLink )->pxPrev = ( pxPrevLink );          \
+    }
+
+/**
+ * @brief Removes the given node from the list it is part of.
+ *
+ * If the given node is not a part of any list (i.e. next and previous
+ * nodes are NULL), nothing happens.
+ *
+ * @param[in] pxLink The given node to remove from the list.
+ */
+#define listREMOVE( pxLink )                                            \
+    {                                                                   \
+        /* If the link is part of a list, remove it from the list. */   \
+        if( ( pxLink )->pxNext != NULL && ( pxLink )->pxPrev != NULL )  \
+        {                                                               \
+            ( pxLink )->pxPrev->pxNext = ( pxLink )->pxNext;            \
+            ( pxLink )->pxNext->pxPrev = ( pxLink )->pxPrev;            \
+        }                                                               \
+                                                                        \
+        /* Make sure that this link is not part of any list anymore. */ \
+        ( pxLink )->pxPrev = NULL;                                      \
+        ( pxLink )->pxNext = NULL;                                      \
+    }
+
+/**
+ * @brief Given the head of a list, checks if the list is empty.
+ *
+ * @param[in] pxHead The head of the given list.
+ */
+#define listIS_EMPTY( pxHead )    ( ( ( pxHead ) == NULL ) || ( ( pxHead )->pxNext == ( pxHead ) ) )
+
+/**
+ * @brief Removes the first node from the given list and returns it.
+ *
+ * Removes the first node from the given list and assigns it to the
+ * pxLink parameter. If the list is empty, it assigns NULL to the
+ * pxLink.
+ *
+ * @param[in] pxHead The head of the list from which to remove the
+ * first node.
+ * @param[out] pxLink The output parameter to receive the removed
+ * node.
+ */
+#define listPOP( pxHead, pxLink )                                           \
+    {                                                                       \
+        if( listIS_EMPTY( ( pxHead ) ) )                                    \
+        {                                                                   \
+            ( pxLink ) = NULL;                                              \
+        }                                                                   \
+        else                                                                \
+        {                                                                   \
+            ( pxLink ) = ( pxHead )->pxNext;                                \
+            /* If the link is part of a list, remove it from the list. */   \
+            if( ( pxLink )->pxNext != NULL && ( pxLink )->pxPrev != NULL )  \
+            {                                                               \
+                ( pxLink )->pxPrev->pxNext = ( pxLink )->pxNext;            \
+                ( pxLink )->pxNext->pxPrev = ( pxLink )->pxPrev;            \
+            }                                                               \
+                                                                            \
+            /* Make sure that this link is not part of any list anymore. */ \
+            ( pxLink )->pxPrev = NULL;                                      \
+            ( pxLink )->pxNext = NULL;                                      \
+        }                                                                   \
+    }
+
+/**
+ * @brief Merges a list into a given list.
+ *
+ * @param[in] pxHeadResultList The head of the given list into which the
+ * other list should be merged.
+ * @param[in] pxHeadListToMerge The head of the list to be merged into the
+ * given list.
+ */
+#define listMERGE( pxHeadResultList, pxHeadListToMerge )                                     \
+    {                                                                                        \
+        if( !listIS_EMPTY( ( pxHeadListToMerge ) ) )                                         \
+        {                                                                                    \
+            /* Setup links between last node of listToMerge and first node of resultList. */ \
+            ( pxHeadListToMerge )->pxPrev->pxNext = ( pxHeadResultList )->pxNext;            \
+            ( pxHeadResultList )->pxNext->pxPrev = ( pxHeadListToMerge )->pxPrev;            \
+                                                                                             \
+            /* Setup links between first node of listToMerge and the head of resultList. */  \
+            ( pxHeadListToMerge )->pxNext->pxPrev = ( pxHeadResultList );                    \
+            ( pxHeadResultList )->pxNext = ( pxHeadListToMerge )->pxNext;                    \
+            /* Empty the merged list. */                                                     \
+            listINIT_HEAD( ( pxHeadListToMerge ) );                                          \
+        }                                                                                    \
+    }
+
+/**
+ * @brief Helper macro to iterate over a list. pxLink contains the link node
+ * in each iteration.
+ */
+#define listFOR_EACH( pxLink, pxHead )    \
+    for( ( pxLink ) = ( pxHead )->pxNext; \
+         ( pxLink ) != ( pxHead );        \
+         ( pxLink ) = ( pxLink )->pxNext )
+
+/**
+ * @brief Helper macro to iterate over a list. It is safe to destroy/free the
+ * nodes while iterating. pxLink contains the link node in each iteration.
+ */
+#define listFOR_EACH_SAFE( pxLink, pxTempLink, pxHead )                        \
+    for( ( pxLink ) = ( pxHead )->pxNext, ( pxTempLink ) = ( pxLink )->pxNext; \
+         ( pxLink ) != ( pxHead );                                             \
+         ( pxLink ) = ( pxTempLink ), ( pxTempLink ) = ( pxLink )->pxNext )
+
+/**
+ * @brief Given the pointer to the link member (of type Link_t) in a struct,
+ * extracts the pointer to the containing struct.
+ *
+ * @param[in] pxLink The pointer to the link member.
+ * @param[in] type The type of the containing struct.
+ * @param[in] member Name of the link member in the containing struct.
+ */
+#define listCONTAINER( pxLink, type, member )    ( ( type * ) ( ( uint8_t * ) ( pxLink ) - ( uint8_t * ) ( &( ( type * ) 0 )->member ) ) )
+
+#endif /* _AWS_DOUBLY_LINKED_LIST_H_ */

freertos/Source/GitHub-FreeRTOS-Kernel-Home.url

@@ -0,0 +1,8 @@
+[{000214A0-0000-0000-C000-000000000046}]
+Prop3=19,2
+[InternetShortcut]
+URL=https://github.com/FreeRTOS/FreeRTOS-Kernel
+IconIndex=0
+IDList=
+HotKey=0
+

freertos/Source/LICENSE.md

@@ -0,0 +1,19 @@
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

freertos/Source/Quick_Start_Guide.url

@@ -0,0 +1,5 @@
+[InternetShortcut]
+URL=https://www.FreeRTOS.org/FreeRTOS-quick-start-guide.html
+IDList=
+[{000214A0-0000-0000-C000-000000000046}]
+Prop3=19,2

freertos/Source/README.md

@@ -0,0 +1,39 @@
+## Getting started
+This repository contains FreeRTOS kernel source/header files and kernel ports only. This repository is referenced as a submodule in [FreeRTOS/FreeRTOS](https://github.com/FreeRTOS/FreeRTOS) repository, which contains pre-configured demo application projects under ```FreeRTOS/Demo``` directory. 
+
+The easiest way to use FreeRTOS is to start with one of the pre-configured demo application projects.  That way you will have the correct FreeRTOS source files included, and the correct include paths configured.  Once a demo application is building and executing you can remove the demo application files, and start to add in your own application source files.  See the [FreeRTOS Kernel Quick Start Guide](https://www.FreeRTOS.org/FreeRTOS-quick-start-guide.html) for detailed instructions and other useful links.
+
+Additionally, for FreeRTOS kernel feature information refer to the [Developer Documentation](https://www.FreeRTOS.org/features.html), and [API Reference](https://www.FreeRTOS.org/a00106.html).
+
+### Getting help
+If you have any questions or need assistance troubleshooting your FreeRTOS project, we have an active community that can help on the [FreeRTOS Community Support Forum](https://forums.freertos.org).
+
+## Cloning this repository
+
+To clone using HTTPS:
+```
+git clone https://github.com/FreeRTOS/FreeRTOS-Kernel.git
+```
+Using SSH:
+```
+git clone git@github.com:FreeRTOS/FreeRTOS-Kernel.git
+```
+
+## Repository structure
+- The root of this repository contains the three files that are common to 
+every port - list.c, queue.c and tasks.c.  The kernel is contained within these 
+three files.  croutine.c implements the optional co-routine functionality - which
+is normally only used on very memory limited systems.
+
+- The ```./portable``` directory contains the files that are specific to a particular microcontroller and/or compiler. 
+See the readme file in the ```./portable``` directory for more information.
+
+- The ```./include``` directory contains the real time kernel header files.
+
+### Code Formatting
+FreeRTOS files are formatted using the "uncrustify" tool. The configuration file used by uncrustify can be found in the [FreeRTOS/FreeRTOS repository](https://github.com/FreeRTOS/FreeRTOS/blob/main/tools/uncrustify.cfg). 
+
+### Spelling
+*lexicon.txt* contains words that are not traditionally found in an English dictionary. It is used by the spellchecker to verify the various jargon, variable names, and other odd words used in the FreeRTOS code base. If your pull request fails to pass the spelling and you believe this is a mistake, then add the word to *lexicon.txt*. 
+Note that only the FreeRTOS Kernel source files are checked for proper spelling, the portable section is ignored.
+

freertos/Source/SECURITY.md

@@ -0,0 +1,5 @@
+## Reporting a Vulnerability
+
+If you discover a potential security issue in this project we ask that you notify AWS/Amazon Security
+via our [vulnerability reporting page](http://aws.amazon.com/security/vulnerability-reporting/) or directly via email to aws-security@amazon.com.
+Please do **not** create a public github issue.

freertos/Source/croutine.c

@@ -0,0 +1,363 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#include "FreeRTOS.h"
+#include "task.h"
+#include "croutine.h"
+
+/* Remove the whole file is co-routines are not being used. */
+#if ( configUSE_CO_ROUTINES != 0 )
+
+/*
+ * Some kernel aware debuggers require data to be viewed to be global, rather
+ * than file scope.
+ */
+    #ifdef portREMOVE_STATIC_QUALIFIER
+        #define static
+    #endif
+
+
+/* Lists for ready and blocked co-routines. --------------------*/
+    static List_t pxReadyCoRoutineLists[ configMAX_CO_ROUTINE_PRIORITIES ]; /*< Prioritised ready co-routines. */
+    static List_t xDelayedCoRoutineList1;                                   /*< Delayed co-routines. */
+    static List_t xDelayedCoRoutineList2;                                   /*< Delayed co-routines (two lists are used - one for delays that have overflowed the current tick count. */
+    static List_t * pxDelayedCoRoutineList = NULL;                          /*< Points to the delayed co-routine list currently being used. */
+    static List_t * pxOverflowDelayedCoRoutineList = NULL;                  /*< Points to the delayed co-routine list currently being used to hold co-routines that have overflowed the current tick count. */
+    static List_t xPendingReadyCoRoutineList;                               /*< Holds co-routines that have been readied by an external event.  They cannot be added directly to the ready lists as the ready lists cannot be accessed by interrupts. */
+
+/* Other file private variables. --------------------------------*/
+    CRCB_t * pxCurrentCoRoutine = NULL;
+    static UBaseType_t uxTopCoRoutineReadyPriority = 0;
+    static TickType_t xCoRoutineTickCount = 0, xLastTickCount = 0, xPassedTicks = 0;
+
+/* The initial state of the co-routine when it is created. */
+    #define corINITIAL_STATE    ( 0 )
+
+/*
+ * Place the co-routine represented by pxCRCB into the appropriate ready queue
+ * for the priority.  It is inserted at the end of the list.
+ *
+ * This macro accesses the co-routine ready lists and therefore must not be
+ * used from within an ISR.
+ */
+    #define prvAddCoRoutineToReadyQueue( pxCRCB )                                                                       \
+    {                                                                                                                   \
+        if( pxCRCB->uxPriority > uxTopCoRoutineReadyPriority )                                                          \
+        {                                                                                                               \
+            uxTopCoRoutineReadyPriority = pxCRCB->uxPriority;                                                           \
+        }                                                                                                               \
+        vListInsertEnd( ( List_t * ) &( pxReadyCoRoutineLists[ pxCRCB->uxPriority ] ), &( pxCRCB->xGenericListItem ) ); \
+    }
+
+/*
+ * Utility to ready all the lists used by the scheduler.  This is called
+ * automatically upon the creation of the first co-routine.
+ */
+    static void prvInitialiseCoRoutineLists( void );
+
+/*
+ * Co-routines that are readied by an interrupt cannot be placed directly into
+ * the ready lists (there is no mutual exclusion).  Instead they are placed in
+ * in the pending ready list in order that they can later be moved to the ready
+ * list by the co-routine scheduler.
+ */
+    static void prvCheckPendingReadyList( void );
+
+/*
+ * Macro that looks at the list of co-routines that are currently delayed to
+ * see if any require waking.
+ *
+ * Co-routines are stored in the queue in the order of their wake time -
+ * meaning once one co-routine has been found whose timer has not expired
+ * we need not look any further down the list.
+ */
+    static void prvCheckDelayedList( void );
+
+/*-----------------------------------------------------------*/
+
+    BaseType_t xCoRoutineCreate( crCOROUTINE_CODE pxCoRoutineCode,
+                                 UBaseType_t uxPriority,
+                                 UBaseType_t uxIndex )
+    {
+        BaseType_t xReturn;
+        CRCB_t * pxCoRoutine;
+
+        /* Allocate the memory that will store the co-routine control block. */
+        pxCoRoutine = ( CRCB_t * ) pvPortMalloc( sizeof( CRCB_t ) );
+
+        if( pxCoRoutine )
+        {
+            /* If pxCurrentCoRoutine is NULL then this is the first co-routine to
+            * be created and the co-routine data structures need initialising. */
+            if( pxCurrentCoRoutine == NULL )
+            {
+                pxCurrentCoRoutine = pxCoRoutine;
+                prvInitialiseCoRoutineLists();
+            }
+
+            /* Check the priority is within limits. */
+            if( uxPriority >= configMAX_CO_ROUTINE_PRIORITIES )
+            {
+                uxPriority = configMAX_CO_ROUTINE_PRIORITIES - 1;
+            }
+
+            /* Fill out the co-routine control block from the function parameters. */
+            pxCoRoutine->uxState = corINITIAL_STATE;
+            pxCoRoutine->uxPriority = uxPriority;
+            pxCoRoutine->uxIndex = uxIndex;
+            pxCoRoutine->pxCoRoutineFunction = pxCoRoutineCode;
+
+            /* Initialise all the other co-routine control block parameters. */
+            vListInitialiseItem( &( pxCoRoutine->xGenericListItem ) );
+            vListInitialiseItem( &( pxCoRoutine->xEventListItem ) );
+
+            /* Set the co-routine control block as a link back from the ListItem_t.
+             * This is so we can get back to the containing CRCB from a generic item
+             * in a list. */
+            listSET_LIST_ITEM_OWNER( &( pxCoRoutine->xGenericListItem ), pxCoRoutine );
+            listSET_LIST_ITEM_OWNER( &( pxCoRoutine->xEventListItem ), pxCoRoutine );
+
+            /* Event lists are always in priority order. */
+            listSET_LIST_ITEM_VALUE( &( pxCoRoutine->xEventListItem ), ( ( TickType_t ) configMAX_CO_ROUTINE_PRIORITIES - ( TickType_t ) uxPriority ) );
+
+            /* Now the co-routine has been initialised it can be added to the ready
+             * list at the correct priority. */
+            prvAddCoRoutineToReadyQueue( pxCoRoutine );
+
+            xReturn = pdPASS;
+        }
+        else
+        {
+            xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
+        }
+
+        return xReturn;
+    }
+/*-----------------------------------------------------------*/
+
+    void vCoRoutineAddToDelayedList( TickType_t xTicksToDelay,
+                                     List_t * pxEventList )
+    {
+        TickType_t xTimeToWake;
+
+        /* Calculate the time to wake - this may overflow but this is
+         * not a problem. */
+        xTimeToWake = xCoRoutineTickCount + xTicksToDelay;
+
+        /* We must remove ourselves from the ready list before adding
+         * ourselves to the blocked list as the same list item is used for
+         * both lists. */
+        ( void ) uxListRemove( ( ListItem_t * ) &( pxCurrentCoRoutine->xGenericListItem ) );
+
+        /* The list item will be inserted in wake time order. */
+        listSET_LIST_ITEM_VALUE( &( pxCurrentCoRoutine->xGenericListItem ), xTimeToWake );
+
+        if( xTimeToWake < xCoRoutineTickCount )
+        {
+            /* Wake time has overflowed.  Place this item in the
+             * overflow list. */
+            vListInsert( ( List_t * ) pxOverflowDelayedCoRoutineList, ( ListItem_t * ) &( pxCurrentCoRoutine->xGenericListItem ) );
+        }
+        else
+        {
+            /* The wake time has not overflowed, so we can use the
+             * current block list. */
+            vListInsert( ( List_t * ) pxDelayedCoRoutineList, ( ListItem_t * ) &( pxCurrentCoRoutine->xGenericListItem ) );
+        }
+
+        if( pxEventList )
+        {
+            /* Also add the co-routine to an event list.  If this is done then the
+             * function must be called with interrupts disabled. */
+            vListInsert( pxEventList, &( pxCurrentCoRoutine->xEventListItem ) );
+        }
+    }
+/*-----------------------------------------------------------*/
+
+    static void prvCheckPendingReadyList( void )
+    {
+        /* Are there any co-routines waiting to get moved to the ready list?  These
+         * are co-routines that have been readied by an ISR.  The ISR cannot access
+         * the ready lists itself. */
+        while( listLIST_IS_EMPTY( &xPendingReadyCoRoutineList ) == pdFALSE )
+        {
+            CRCB_t * pxUnblockedCRCB;
+
+            /* The pending ready list can be accessed by an ISR. */
+            portDISABLE_INTERRUPTS();
+            {
+                pxUnblockedCRCB = ( CRCB_t * ) listGET_OWNER_OF_HEAD_ENTRY( ( &xPendingReadyCoRoutineList ) );
+                ( void ) uxListRemove( &( pxUnblockedCRCB->xEventListItem ) );
+            }
+            portENABLE_INTERRUPTS();
+
+            ( void ) uxListRemove( &( pxUnblockedCRCB->xGenericListItem ) );
+            prvAddCoRoutineToReadyQueue( pxUnblockedCRCB );
+        }
+    }
+/*-----------------------------------------------------------*/
+
+    static void prvCheckDelayedList( void )
+    {
+        CRCB_t * pxCRCB;
+
+        xPassedTicks = xTaskGetTickCount() - xLastTickCount;
+
+        while( xPassedTicks )
+        {
+            xCoRoutineTickCount++;
+            xPassedTicks--;
+
+            /* If the tick count has overflowed we need to swap the ready lists. */
+            if( xCoRoutineTickCount == 0 )
+            {
+                List_t * pxTemp;
+
+                /* Tick count has overflowed so we need to swap the delay lists.  If there are
+                 * any items in pxDelayedCoRoutineList here then there is an error! */
+                pxTemp = pxDelayedCoRoutineList;
+                pxDelayedCoRoutineList = pxOverflowDelayedCoRoutineList;
+                pxOverflowDelayedCoRoutineList = pxTemp;
+            }
+
+            /* See if this tick has made a timeout expire. */
+            while( listLIST_IS_EMPTY( pxDelayedCoRoutineList ) == pdFALSE )
+            {
+                pxCRCB = ( CRCB_t * ) listGET_OWNER_OF_HEAD_ENTRY( pxDelayedCoRoutineList );
+
+                if( xCoRoutineTickCount < listGET_LIST_ITEM_VALUE( &( pxCRCB->xGenericListItem ) ) )
+                {
+                    /* Timeout not yet expired. */
+                    break;
+                }
+
+                portDISABLE_INTERRUPTS();
+                {
+                    /* The event could have occurred just before this critical
+                     *  section.  If this is the case then the generic list item will
+                     *  have been moved to the pending ready list and the following
+                     *  line is still valid.  Also the pvContainer parameter will have
+                     *  been set to NULL so the following lines are also valid. */
+                    ( void ) uxListRemove( &( pxCRCB->xGenericListItem ) );
+
+                    /* Is the co-routine waiting on an event also? */
+                    if( pxCRCB->xEventListItem.pxContainer )
+                    {
+                        ( void ) uxListRemove( &( pxCRCB->xEventListItem ) );
+                    }
+                }
+                portENABLE_INTERRUPTS();
+
+                prvAddCoRoutineToReadyQueue( pxCRCB );
+            }
+        }
+
+        xLastTickCount = xCoRoutineTickCount;
+    }
+/*-----------------------------------------------------------*/
+
+    void vCoRoutineSchedule( void )
+    {
+        /* Only run a co-routine after prvInitialiseCoRoutineLists() has been
+         * called.  prvInitialiseCoRoutineLists() is called automatically when a
+         * co-routine is created. */
+        if( pxDelayedCoRoutineList != NULL )
+        {
+            /* See if any co-routines readied by events need moving to the ready lists. */
+            prvCheckPendingReadyList();
+
+            /* See if any delayed co-routines have timed out. */
+            prvCheckDelayedList();
+
+            /* Find the highest priority queue that contains ready co-routines. */
+            while( listLIST_IS_EMPTY( &( pxReadyCoRoutineLists[ uxTopCoRoutineReadyPriority ] ) ) )
+            {
+                if( uxTopCoRoutineReadyPriority == 0 )
+                {
+                    /* No more co-routines to check. */
+                    return;
+                }
+
+                --uxTopCoRoutineReadyPriority;
+            }
+
+            /* listGET_OWNER_OF_NEXT_ENTRY walks through the list, so the co-routines
+             * of the same priority get an equal share of the processor time. */
+            listGET_OWNER_OF_NEXT_ENTRY( pxCurrentCoRoutine, &( pxReadyCoRoutineLists[ uxTopCoRoutineReadyPriority ] ) );
+
+            /* Call the co-routine. */
+            ( pxCurrentCoRoutine->pxCoRoutineFunction )( pxCurrentCoRoutine, pxCurrentCoRoutine->uxIndex );
+        }
+    }
+/*-----------------------------------------------------------*/
+
+    static void prvInitialiseCoRoutineLists( void )
+    {
+        UBaseType_t uxPriority;
+
+        for( uxPriority = 0; uxPriority < configMAX_CO_ROUTINE_PRIORITIES; uxPriority++ )
+        {
+            vListInitialise( ( List_t * ) &( pxReadyCoRoutineLists[ uxPriority ] ) );
+        }
+
+        vListInitialise( ( List_t * ) &xDelayedCoRoutineList1 );
+        vListInitialise( ( List_t * ) &xDelayedCoRoutineList2 );
+        vListInitialise( ( List_t * ) &xPendingReadyCoRoutineList );
+
+        /* Start with pxDelayedCoRoutineList using list1 and the
+         * pxOverflowDelayedCoRoutineList using list2. */
+        pxDelayedCoRoutineList = &xDelayedCoRoutineList1;
+        pxOverflowDelayedCoRoutineList = &xDelayedCoRoutineList2;
+    }
+/*-----------------------------------------------------------*/
+
+    BaseType_t xCoRoutineRemoveFromEventList( const List_t * pxEventList )
+    {
+        CRCB_t * pxUnblockedCRCB;
+        BaseType_t xReturn;
+
+        /* This function is called from within an interrupt.  It can only access
+         * event lists and the pending ready list.  This function assumes that a
+         * check has already been made to ensure pxEventList is not empty. */
+        pxUnblockedCRCB = ( CRCB_t * ) listGET_OWNER_OF_HEAD_ENTRY( pxEventList );
+        ( void ) uxListRemove( &( pxUnblockedCRCB->xEventListItem ) );
+        vListInsertEnd( ( List_t * ) &( xPendingReadyCoRoutineList ), &( pxUnblockedCRCB->xEventListItem ) );
+
+        if( pxUnblockedCRCB->uxPriority >= pxCurrentCoRoutine->uxPriority )
+        {
+            xReturn = pdTRUE;
+        }
+        else
+        {
+            xReturn = pdFALSE;
+        }
+
+        return xReturn;
+    }
+
+#endif /* configUSE_CO_ROUTINES == 0 */

freertos/Source/event_groups.c

@@ -0,0 +1,777 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+/* Standard includes. */
+#include <stdlib.h>
+
+/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
+ * all the API functions to use the MPU wrappers.  That should only be done when
+ * task.h is included from an application file. */
+#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+/* FreeRTOS includes. */
+#include "FreeRTOS.h"
+#include "task.h"
+#include "timers.h"
+#include "event_groups.h"
+
+/* Lint e961, e750 and e9021 are suppressed as a MISRA exception justified
+ * because the MPU ports require MPU_WRAPPERS_INCLUDED_FROM_API_FILE to be defined
+ * for the header files above, but not in this file, in order to generate the
+ * correct privileged Vs unprivileged linkage and placement. */
+#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE /*lint !e961 !e750 !e9021 See comment above. */
+
+/* The following bit fields convey control information in a task's event list
+ * item value.  It is important they don't clash with the
+ * taskEVENT_LIST_ITEM_VALUE_IN_USE definition. */
+#if configUSE_16_BIT_TICKS == 1
+    #define eventCLEAR_EVENTS_ON_EXIT_BIT    0x0100U
+    #define eventUNBLOCKED_DUE_TO_BIT_SET    0x0200U
+    #define eventWAIT_FOR_ALL_BITS           0x0400U
+    #define eventEVENT_BITS_CONTROL_BYTES    0xff00U
+#else
+    #define eventCLEAR_EVENTS_ON_EXIT_BIT    0x01000000UL
+    #define eventUNBLOCKED_DUE_TO_BIT_SET    0x02000000UL
+    #define eventWAIT_FOR_ALL_BITS           0x04000000UL
+    #define eventEVENT_BITS_CONTROL_BYTES    0xff000000UL
+#endif
+
+typedef struct EventGroupDef_t
+{
+    EventBits_t uxEventBits;
+    List_t xTasksWaitingForBits; /*< List of tasks waiting for a bit to be set. */
+
+    #if ( configUSE_TRACE_FACILITY == 1 )
+        UBaseType_t uxEventGroupNumber;
+    #endif
+
+    #if ( ( configSUPPORT_STATIC_ALLOCATION == 1 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
+        uint8_t ucStaticallyAllocated; /*< Set to pdTRUE if the event group is statically allocated to ensure no attempt is made to free the memory. */
+    #endif
+} EventGroup_t;
+
+/*-----------------------------------------------------------*/
+
+/*
+ * Test the bits set in uxCurrentEventBits to see if the wait condition is met.
+ * The wait condition is defined by xWaitForAllBits.  If xWaitForAllBits is
+ * pdTRUE then the wait condition is met if all the bits set in uxBitsToWaitFor
+ * are also set in uxCurrentEventBits.  If xWaitForAllBits is pdFALSE then the
+ * wait condition is met if any of the bits set in uxBitsToWait for are also set
+ * in uxCurrentEventBits.
+ */
+static BaseType_t prvTestWaitCondition( const EventBits_t uxCurrentEventBits,
+                                        const EventBits_t uxBitsToWaitFor,
+                                        const BaseType_t xWaitForAllBits ) PRIVILEGED_FUNCTION;
+
+/*-----------------------------------------------------------*/
+
+#if ( configSUPPORT_STATIC_ALLOCATION == 1 )
+
+    EventGroupHandle_t xEventGroupCreateStatic( StaticEventGroup_t * pxEventGroupBuffer )
+    {
+        EventGroup_t * pxEventBits;
+
+        /* A StaticEventGroup_t object must be provided. */
+        configASSERT( pxEventGroupBuffer );
+
+        #if ( configASSERT_DEFINED == 1 )
+            {
+                /* Sanity check that the size of the structure used to declare a
+                 * variable of type StaticEventGroup_t equals the size of the real
+                 * event group structure. */
+                volatile size_t xSize = sizeof( StaticEventGroup_t );
+                configASSERT( xSize == sizeof( EventGroup_t ) );
+            } /*lint !e529 xSize is referenced if configASSERT() is defined. */
+        #endif /* configASSERT_DEFINED */
+
+        /* The user has provided a statically allocated event group - use it. */
+        pxEventBits = ( EventGroup_t * ) pxEventGroupBuffer; /*lint !e740 !e9087 EventGroup_t and StaticEventGroup_t are deliberately aliased for data hiding purposes and guaranteed to have the same size and alignment requirement - checked by configASSERT(). */
+
+        if( pxEventBits != NULL )
+        {
+            pxEventBits->uxEventBits = 0;
+            vListInitialise( &( pxEventBits->xTasksWaitingForBits ) );
+
+            #if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 )
+                {
+                    /* Both static and dynamic allocation can be used, so note that
+                     * this event group was created statically in case the event group
+                     * is later deleted. */
+                    pxEventBits->ucStaticallyAllocated = pdTRUE;
+                }
+            #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
+
+            traceEVENT_GROUP_CREATE( pxEventBits );
+        }
+        else
+        {
+            /* xEventGroupCreateStatic should only ever be called with
+             * pxEventGroupBuffer pointing to a pre-allocated (compile time
+             * allocated) StaticEventGroup_t variable. */
+            traceEVENT_GROUP_CREATE_FAILED();
+        }
+
+        return pxEventBits;
+    }
+
+#endif /* configSUPPORT_STATIC_ALLOCATION */
+/*-----------------------------------------------------------*/
+
+#if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 )
+
+    EventGroupHandle_t xEventGroupCreate( void )
+    {
+        EventGroup_t * pxEventBits;
+
+        /* Allocate the event group.  Justification for MISRA deviation as
+         * follows:  pvPortMalloc() always ensures returned memory blocks are
+         * aligned per the requirements of the MCU stack.  In this case
+         * pvPortMalloc() must return a pointer that is guaranteed to meet the
+         * alignment requirements of the EventGroup_t structure - which (if you
+         * follow it through) is the alignment requirements of the TickType_t type
+         * (EventBits_t being of TickType_t itself).  Therefore, whenever the
+         * stack alignment requirements are greater than or equal to the
+         * TickType_t alignment requirements the cast is safe.  In other cases,
+         * where the natural word size of the architecture is less than
+         * sizeof( TickType_t ), the TickType_t variables will be accessed in two
+         * or more reads operations, and the alignment requirements is only that
+         * of each individual read. */
+        pxEventBits = ( EventGroup_t * ) pvPortMalloc( sizeof( EventGroup_t ) ); /*lint !e9087 !e9079 see comment above. */
+
+        if( pxEventBits != NULL )
+        {
+            pxEventBits->uxEventBits = 0;
+            vListInitialise( &( pxEventBits->xTasksWaitingForBits ) );
+
+            #if ( configSUPPORT_STATIC_ALLOCATION == 1 )
+                {
+                    /* Both static and dynamic allocation can be used, so note this
+                     * event group was allocated statically in case the event group is
+                     * later deleted. */
+                    pxEventBits->ucStaticallyAllocated = pdFALSE;
+                }
+            #endif /* configSUPPORT_STATIC_ALLOCATION */
+
+            traceEVENT_GROUP_CREATE( pxEventBits );
+        }
+        else
+        {
+            traceEVENT_GROUP_CREATE_FAILED(); /*lint !e9063 Else branch only exists to allow tracing and does not generate code if trace macros are not defined. */
+        }
+
+        return pxEventBits;
+    }
+
+#endif /* configSUPPORT_DYNAMIC_ALLOCATION */
+/*-----------------------------------------------------------*/
+
+EventBits_t xEventGroupSync( EventGroupHandle_t xEventGroup,
+                             const EventBits_t uxBitsToSet,
+                             const EventBits_t uxBitsToWaitFor,
+                             TickType_t xTicksToWait )
+{
+    EventBits_t uxOriginalBitValue, uxReturn;
+    EventGroup_t * pxEventBits = xEventGroup;
+    BaseType_t xAlreadyYielded;
+    BaseType_t xTimeoutOccurred = pdFALSE;
+
+    configASSERT( ( uxBitsToWaitFor & eventEVENT_BITS_CONTROL_BYTES ) == 0 );
+    configASSERT( uxBitsToWaitFor != 0 );
+    #if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) )
+        {
+            configASSERT( !( ( xTaskGetSchedulerState() == taskSCHEDULER_SUSPENDED ) && ( xTicksToWait != 0 ) ) );
+        }
+    #endif
+
+    vTaskSuspendAll();
+    {
+        uxOriginalBitValue = pxEventBits->uxEventBits;
+
+        ( void ) xEventGroupSetBits( xEventGroup, uxBitsToSet );
+
+        if( ( ( uxOriginalBitValue | uxBitsToSet ) & uxBitsToWaitFor ) == uxBitsToWaitFor )
+        {
+            /* All the rendezvous bits are now set - no need to block. */
+            uxReturn = ( uxOriginalBitValue | uxBitsToSet );
+
+            /* Rendezvous always clear the bits.  They will have been cleared
+             * already unless this is the only task in the rendezvous. */
+            pxEventBits->uxEventBits &= ~uxBitsToWaitFor;
+
+            xTicksToWait = 0;
+        }
+        else
+        {
+            if( xTicksToWait != ( TickType_t ) 0 )
+            {
+                traceEVENT_GROUP_SYNC_BLOCK( xEventGroup, uxBitsToSet, uxBitsToWaitFor );
+
+                /* Store the bits that the calling task is waiting for in the
+                 * task's event list item so the kernel knows when a match is
+                 * found.  Then enter the blocked state. */
+                vTaskPlaceOnUnorderedEventList( &( pxEventBits->xTasksWaitingForBits ), ( uxBitsToWaitFor | eventCLEAR_EVENTS_ON_EXIT_BIT | eventWAIT_FOR_ALL_BITS ), xTicksToWait );
+
+                /* This assignment is obsolete as uxReturn will get set after
+                 * the task unblocks, but some compilers mistakenly generate a
+                 * warning about uxReturn being returned without being set if the
+                 * assignment is omitted. */
+                uxReturn = 0;
+            }
+            else
+            {
+                /* The rendezvous bits were not set, but no block time was
+                 * specified - just return the current event bit value. */
+                uxReturn = pxEventBits->uxEventBits;
+                xTimeoutOccurred = pdTRUE;
+            }
+        }
+    }
+    xAlreadyYielded = xTaskResumeAll();
+
+    if( xTicksToWait != ( TickType_t ) 0 )
+    {
+        if( xAlreadyYielded == pdFALSE )
+        {
+            portYIELD_WITHIN_API();
+        }
+        else
+        {
+            mtCOVERAGE_TEST_MARKER();
+        }
+
+        /* The task blocked to wait for its required bits to be set - at this
+         * point either the required bits were set or the block time expired.  If
+         * the required bits were set they will have been stored in the task's
+         * event list item, and they should now be retrieved then cleared. */
+        uxReturn = uxTaskResetEventItemValue();
+
+        if( ( uxReturn & eventUNBLOCKED_DUE_TO_BIT_SET ) == ( EventBits_t ) 0 )
+        {
+            /* The task timed out, just return the current event bit value. */
+            taskENTER_CRITICAL();
+            {
+                uxReturn = pxEventBits->uxEventBits;
+
+                /* Although the task got here because it timed out before the
+                 * bits it was waiting for were set, it is possible that since it
+                 * unblocked another task has set the bits.  If this is the case
+                 * then it needs to clear the bits before exiting. */
+                if( ( uxReturn & uxBitsToWaitFor ) == uxBitsToWaitFor )
+                {
+                    pxEventBits->uxEventBits &= ~uxBitsToWaitFor;
+                }
+                else
+                {
+                    mtCOVERAGE_TEST_MARKER();
+                }
+            }
+            taskEXIT_CRITICAL();
+
+            xTimeoutOccurred = pdTRUE;
+        }
+        else
+        {
+            /* The task unblocked because the bits were set. */
+        }
+
+        /* Control bits might be set as the task had blocked should not be
+         * returned. */
+        uxReturn &= ~eventEVENT_BITS_CONTROL_BYTES;
+    }
+
+    traceEVENT_GROUP_SYNC_END( xEventGroup, uxBitsToSet, uxBitsToWaitFor, xTimeoutOccurred );
+
+    /* Prevent compiler warnings when trace macros are not used. */
+    ( void ) xTimeoutOccurred;
+
+    return uxReturn;
+}
+/*-----------------------------------------------------------*/
+
+EventBits_t xEventGroupWaitBits( EventGroupHandle_t xEventGroup,
+                                 const EventBits_t uxBitsToWaitFor,
+                                 const BaseType_t xClearOnExit,
+                                 const BaseType_t xWaitForAllBits,
+                                 TickType_t xTicksToWait )
+{
+    EventGroup_t * pxEventBits = xEventGroup;
+    EventBits_t uxReturn, uxControlBits = 0;
+    BaseType_t xWaitConditionMet, xAlreadyYielded;
+    BaseType_t xTimeoutOccurred = pdFALSE;
+
+    /* Check the user is not attempting to wait on the bits used by the kernel
+     * itself, and that at least one bit is being requested. */
+    configASSERT( xEventGroup );
+    configASSERT( ( uxBitsToWaitFor & eventEVENT_BITS_CONTROL_BYTES ) == 0 );
+    configASSERT( uxBitsToWaitFor != 0 );
+    #if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) )
+        {
+            configASSERT( !( ( xTaskGetSchedulerState() == taskSCHEDULER_SUSPENDED ) && ( xTicksToWait != 0 ) ) );
+        }
+    #endif
+
+    vTaskSuspendAll();
+    {
+        const EventBits_t uxCurrentEventBits = pxEventBits->uxEventBits;
+
+        /* Check to see if the wait condition is already met or not. */
+        xWaitConditionMet = prvTestWaitCondition( uxCurrentEventBits, uxBitsToWaitFor, xWaitForAllBits );
+
+        if( xWaitConditionMet != pdFALSE )
+        {
+            /* The wait condition has already been met so there is no need to
+             * block. */
+            uxReturn = uxCurrentEventBits;
+            xTicksToWait = ( TickType_t ) 0;
+
+            /* Clear the wait bits if requested to do so. */
+            if( xClearOnExit != pdFALSE )
+            {
+                pxEventBits->uxEventBits &= ~uxBitsToWaitFor;
+            }
+            else
+            {
+                mtCOVERAGE_TEST_MARKER();
+            }
+        }
+        else if( xTicksToWait == ( TickType_t ) 0 )
+        {
+            /* The wait condition has not been met, but no block time was
+             * specified, so just return the current value. */
+            uxReturn = uxCurrentEventBits;
+            xTimeoutOccurred = pdTRUE;
+        }
+        else
+        {
+            /* The task is going to block to wait for its required bits to be
+             * set.  uxControlBits are used to remember the specified behaviour of
+             * this call to xEventGroupWaitBits() - for use when the event bits
+             * unblock the task. */
+            if( xClearOnExit != pdFALSE )
+            {
+                uxControlBits |= eventCLEAR_EVENTS_ON_EXIT_BIT;
+            }
+            else
+            {
+                mtCOVERAGE_TEST_MARKER();
+            }
+
+            if( xWaitForAllBits != pdFALSE )
+            {
+                uxControlBits |= eventWAIT_FOR_ALL_BITS;
+            }
+            else
+            {
+                mtCOVERAGE_TEST_MARKER();
+            }
+
+            /* Store the bits that the calling task is waiting for in the
+             * task's event list item so the kernel knows when a match is
+             * found.  Then enter the blocked state. */
+            vTaskPlaceOnUnorderedEventList( &( pxEventBits->xTasksWaitingForBits ), ( uxBitsToWaitFor | uxControlBits ), xTicksToWait );
+
+            /* This is obsolete as it will get set after the task unblocks, but
+             * some compilers mistakenly generate a warning about the variable
+             * being returned without being set if it is not done. */
+            uxReturn = 0;
+
+            traceEVENT_GROUP_WAIT_BITS_BLOCK( xEventGroup, uxBitsToWaitFor );
+        }
+    }
+    xAlreadyYielded = xTaskResumeAll();
+
+    if( xTicksToWait != ( TickType_t ) 0 )
+    {
+        if( xAlreadyYielded == pdFALSE )
+        {
+            portYIELD_WITHIN_API();
+        }
+        else
+        {
+            mtCOVERAGE_TEST_MARKER();
+        }
+
+        /* The task blocked to wait for its required bits to be set - at this
+         * point either the required bits were set or the block time expired.  If
+         * the required bits were set they will have been stored in the task's
+         * event list item, and they should now be retrieved then cleared. */
+        uxReturn = uxTaskResetEventItemValue();
+
+        if( ( uxReturn & eventUNBLOCKED_DUE_TO_BIT_SET ) == ( EventBits_t ) 0 )
+        {
+            taskENTER_CRITICAL();
+            {
+                /* The task timed out, just return the current event bit value. */
+                uxReturn = pxEventBits->uxEventBits;
+
+                /* It is possible that the event bits were updated between this
+                 * task leaving the Blocked state and running again. */
+                if( prvTestWaitCondition( uxReturn, uxBitsToWaitFor, xWaitForAllBits ) != pdFALSE )
+                {
+                    if( xClearOnExit != pdFALSE )
+                    {
+                        pxEventBits->uxEventBits &= ~uxBitsToWaitFor;
+                    }
+                    else
+                    {
+                        mtCOVERAGE_TEST_MARKER();
+                    }
+                }
+                else
+                {
+                    mtCOVERAGE_TEST_MARKER();
+                }
+
+                xTimeoutOccurred = pdTRUE;
+            }
+            taskEXIT_CRITICAL();
+        }
+        else
+        {
+            /* The task unblocked because the bits were set. */
+        }
+
+        /* The task blocked so control bits may have been set. */
+        uxReturn &= ~eventEVENT_BITS_CONTROL_BYTES;
+    }
+
+    traceEVENT_GROUP_WAIT_BITS_END( xEventGroup, uxBitsToWaitFor, xTimeoutOccurred );
+
+    /* Prevent compiler warnings when trace macros are not used. */
+    ( void ) xTimeoutOccurred;
+
+    return uxReturn;
+}
+/*-----------------------------------------------------------*/
+
+EventBits_t xEventGroupClearBits( EventGroupHandle_t xEventGroup,
+                                  const EventBits_t uxBitsToClear )
+{
+    EventGroup_t * pxEventBits = xEventGroup;
+    EventBits_t uxReturn;
+
+    /* Check the user is not attempting to clear the bits used by the kernel
+     * itself. */
+    configASSERT( xEventGroup );
+    configASSERT( ( uxBitsToClear & eventEVENT_BITS_CONTROL_BYTES ) == 0 );
+
+    taskENTER_CRITICAL();
+    {
+        traceEVENT_GROUP_CLEAR_BITS( xEventGroup, uxBitsToClear );
+
+        /* The value returned is the event group value prior to the bits being
+         * cleared. */
+        uxReturn = pxEventBits->uxEventBits;
+
+        /* Clear the bits. */
+        pxEventBits->uxEventBits &= ~uxBitsToClear;
+    }
+    taskEXIT_CRITICAL();
+
+    return uxReturn;
+}
+/*-----------------------------------------------------------*/
+
+#if ( ( configUSE_TRACE_FACILITY == 1 ) && ( INCLUDE_xTimerPendFunctionCall == 1 ) && ( configUSE_TIMERS == 1 ) )
+
+    BaseType_t xEventGroupClearBitsFromISR( EventGroupHandle_t xEventGroup,
+                                            const EventBits_t uxBitsToClear )
+    {
+        BaseType_t xReturn;
+
+        traceEVENT_GROUP_CLEAR_BITS_FROM_ISR( xEventGroup, uxBitsToClear );
+        xReturn = xTimerPendFunctionCallFromISR( vEventGroupClearBitsCallback, ( void * ) xEventGroup, ( uint32_t ) uxBitsToClear, NULL ); /*lint !e9087 Can't avoid cast to void* as a generic callback function not specific to this use case. Callback casts back to original type so safe. */
+
+        return xReturn;
+    }
+
+#endif /* if ( ( configUSE_TRACE_FACILITY == 1 ) && ( INCLUDE_xTimerPendFunctionCall == 1 ) && ( configUSE_TIMERS == 1 ) ) */
+/*-----------------------------------------------------------*/
+
+EventBits_t xEventGroupGetBitsFromISR( EventGroupHandle_t xEventGroup )
+{
+    UBaseType_t uxSavedInterruptStatus;
+    EventGroup_t const * const pxEventBits = xEventGroup;
+    EventBits_t uxReturn;
+
+    uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
+    {
+        uxReturn = pxEventBits->uxEventBits;
+    }
+    portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
+
+    return uxReturn;
+} /*lint !e818 EventGroupHandle_t is a typedef used in other functions to so can't be pointer to const. */
+/*-----------------------------------------------------------*/
+
+EventBits_t xEventGroupSetBits( EventGroupHandle_t xEventGroup,
+                                const EventBits_t uxBitsToSet )
+{
+    ListItem_t * pxListItem, * pxNext;
+    ListItem_t const * pxListEnd;
+    List_t const * pxList;
+    EventBits_t uxBitsToClear = 0, uxBitsWaitedFor, uxControlBits;
+    EventGroup_t * pxEventBits = xEventGroup;
+    BaseType_t xMatchFound = pdFALSE;
+
+    /* Check the user is not attempting to set the bits used by the kernel
+     * itself. */
+    configASSERT( xEventGroup );
+    configASSERT( ( uxBitsToSet & eventEVENT_BITS_CONTROL_BYTES ) == 0 );
+
+    pxList = &( pxEventBits->xTasksWaitingForBits );
+    pxListEnd = listGET_END_MARKER( pxList ); /*lint !e826 !e740 !e9087 The mini list structure is used as the list end to save RAM.  This is checked and valid. */
+    vTaskSuspendAll();
+    {
+        traceEVENT_GROUP_SET_BITS( xEventGroup, uxBitsToSet );
+
+        pxListItem = listGET_HEAD_ENTRY( pxList );
+
+        /* Set the bits. */
+        pxEventBits->uxEventBits |= uxBitsToSet;
+
+        /* See if the new bit value should unblock any tasks. */
+        while( pxListItem != pxListEnd )
+        {
+            pxNext = listGET_NEXT( pxListItem );
+            uxBitsWaitedFor = listGET_LIST_ITEM_VALUE( pxListItem );
+            xMatchFound = pdFALSE;
+
+            /* Split the bits waited for from the control bits. */
+            uxControlBits = uxBitsWaitedFor & eventEVENT_BITS_CONTROL_BYTES;
+            uxBitsWaitedFor &= ~eventEVENT_BITS_CONTROL_BYTES;
+
+            if( ( uxControlBits & eventWAIT_FOR_ALL_BITS ) == ( EventBits_t ) 0 )
+            {
+                /* Just looking for single bit being set. */
+                if( ( uxBitsWaitedFor & pxEventBits->uxEventBits ) != ( EventBits_t ) 0 )
+                {
+                    xMatchFound = pdTRUE;
+                }
+                else
+                {
+                    mtCOVERAGE_TEST_MARKER();
+                }
+            }
+            else if( ( uxBitsWaitedFor & pxEventBits->uxEventBits ) == uxBitsWaitedFor )
+            {
+                /* All bits are set. */
+                xMatchFound = pdTRUE;
+            }
+            else
+            {
+                /* Need all bits to be set, but not all the bits were set. */
+            }
+
+            if( xMatchFound != pdFALSE )
+            {
+                /* The bits match.  Should the bits be cleared on exit? */
+                if( ( uxControlBits & eventCLEAR_EVENTS_ON_EXIT_BIT ) != ( EventBits_t ) 0 )
+                {
+                    uxBitsToClear |= uxBitsWaitedFor;
+                }
+                else
+                {
+                    mtCOVERAGE_TEST_MARKER();
+                }
+
+                /* Store the actual event flag value in the task's event list
+                 * item before removing the task from the event list.  The
+                 * eventUNBLOCKED_DUE_TO_BIT_SET bit is set so the task knows
+                 * that is was unblocked due to its required bits matching, rather
+                 * than because it timed out. */
+                vTaskRemoveFromUnorderedEventList( pxListItem, pxEventBits->uxEventBits | eventUNBLOCKED_DUE_TO_BIT_SET );
+            }
+
+            /* Move onto the next list item.  Note pxListItem->pxNext is not
+             * used here as the list item may have been removed from the event list
+             * and inserted into the ready/pending reading list. */
+            pxListItem = pxNext;
+        }
+
+        /* Clear any bits that matched when the eventCLEAR_EVENTS_ON_EXIT_BIT
+         * bit was set in the control word. */
+        pxEventBits->uxEventBits &= ~uxBitsToClear;
+    }
+    ( void ) xTaskResumeAll();
+
+    return pxEventBits->uxEventBits;
+}
+/*-----------------------------------------------------------*/
+
+void vEventGroupDelete( EventGroupHandle_t xEventGroup )
+{
+    EventGroup_t * pxEventBits = xEventGroup;
+    const List_t * pxTasksWaitingForBits;
+
+    configASSERT( pxEventBits );
+
+    pxTasksWaitingForBits = &( pxEventBits->xTasksWaitingForBits );
+
+    vTaskSuspendAll();
+    {
+        traceEVENT_GROUP_DELETE( xEventGroup );
+
+        while( listCURRENT_LIST_LENGTH( pxTasksWaitingForBits ) > ( UBaseType_t ) 0 )
+        {
+            /* Unblock the task, returning 0 as the event list is being deleted
+             * and cannot therefore have any bits set. */
+            configASSERT( pxTasksWaitingForBits->xListEnd.pxNext != ( const ListItem_t * ) &( pxTasksWaitingForBits->xListEnd ) );
+            vTaskRemoveFromUnorderedEventList( pxTasksWaitingForBits->xListEnd.pxNext, eventUNBLOCKED_DUE_TO_BIT_SET );
+        }
+
+        #if ( ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 0 ) )
+            {
+                /* The event group can only have been allocated dynamically - free
+                 * it again. */
+                vPortFree( pxEventBits );
+            }
+        #elif ( ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 1 ) )
+            {
+                /* The event group could have been allocated statically or
+                 * dynamically, so check before attempting to free the memory. */
+                if( pxEventBits->ucStaticallyAllocated == ( uint8_t ) pdFALSE )
+                {
+                    vPortFree( pxEventBits );
+                }
+                else
+                {
+                    mtCOVERAGE_TEST_MARKER();
+                }
+            }
+        #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
+    }
+    ( void ) xTaskResumeAll();
+}
+/*-----------------------------------------------------------*/
+
+/* For internal use only - execute a 'set bits' command that was pended from
+ * an interrupt. */
+void vEventGroupSetBitsCallback( void * pvEventGroup,
+                                 const uint32_t ulBitsToSet )
+{
+    ( void ) xEventGroupSetBits( pvEventGroup, ( EventBits_t ) ulBitsToSet ); /*lint !e9079 Can't avoid cast to void* as a generic timer callback prototype. Callback casts back to original type so safe. */
+}
+/*-----------------------------------------------------------*/
+
+/* For internal use only - execute a 'clear bits' command that was pended from
+ * an interrupt. */
+void vEventGroupClearBitsCallback( void * pvEventGroup,
+                                   const uint32_t ulBitsToClear )
+{
+    ( void ) xEventGroupClearBits( pvEventGroup, ( EventBits_t ) ulBitsToClear ); /*lint !e9079 Can't avoid cast to void* as a generic timer callback prototype. Callback casts back to original type so safe. */
+}
+/*-----------------------------------------------------------*/
+
+static BaseType_t prvTestWaitCondition( const EventBits_t uxCurrentEventBits,
+                                        const EventBits_t uxBitsToWaitFor,
+                                        const BaseType_t xWaitForAllBits )
+{
+    BaseType_t xWaitConditionMet = pdFALSE;
+
+    if( xWaitForAllBits == pdFALSE )
+    {
+        /* Task only has to wait for one bit within uxBitsToWaitFor to be
+         * set.  Is one already set? */
+        if( ( uxCurrentEventBits & uxBitsToWaitFor ) != ( EventBits_t ) 0 )
+        {
+            xWaitConditionMet = pdTRUE;
+        }
+        else
+        {
+            mtCOVERAGE_TEST_MARKER();
+        }
+    }
+    else
+    {
+        /* Task has to wait for all the bits in uxBitsToWaitFor to be set.
+         * Are they set already? */
+        if( ( uxCurrentEventBits & uxBitsToWaitFor ) == uxBitsToWaitFor )
+        {
+            xWaitConditionMet = pdTRUE;
+        }
+        else
+        {
+            mtCOVERAGE_TEST_MARKER();
+        }
+    }
+
+    return xWaitConditionMet;
+}
+/*-----------------------------------------------------------*/
+
+#if ( ( configUSE_TRACE_FACILITY == 1 ) && ( INCLUDE_xTimerPendFunctionCall == 1 ) && ( configUSE_TIMERS == 1 ) )
+
+    BaseType_t xEventGroupSetBitsFromISR( EventGroupHandle_t xEventGroup,
+                                          const EventBits_t uxBitsToSet,
+                                          BaseType_t * pxHigherPriorityTaskWoken )
+    {
+        BaseType_t xReturn;
+
+        traceEVENT_GROUP_SET_BITS_FROM_ISR( xEventGroup, uxBitsToSet );
+        xReturn = xTimerPendFunctionCallFromISR( vEventGroupSetBitsCallback, ( void * ) xEventGroup, ( uint32_t ) uxBitsToSet, pxHigherPriorityTaskWoken ); /*lint !e9087 Can't avoid cast to void* as a generic callback function not specific to this use case. Callback casts back to original type so safe. */
+
+        return xReturn;
+    }
+
+#endif /* if ( ( configUSE_TRACE_FACILITY == 1 ) && ( INCLUDE_xTimerPendFunctionCall == 1 ) && ( configUSE_TIMERS == 1 ) ) */
+/*-----------------------------------------------------------*/
+
+#if ( configUSE_TRACE_FACILITY == 1 )
+
+    UBaseType_t uxEventGroupGetNumber( void * xEventGroup )
+    {
+        UBaseType_t xReturn;
+        EventGroup_t const * pxEventBits = ( EventGroup_t * ) xEventGroup; /*lint !e9087 !e9079 EventGroupHandle_t is a pointer to an EventGroup_t, but EventGroupHandle_t is kept opaque outside of this file for data hiding purposes. */
+
+        if( xEventGroup == NULL )
+        {
+            xReturn = 0;
+        }
+        else
+        {
+            xReturn = pxEventBits->uxEventGroupNumber;
+        }
+
+        return xReturn;
+    }
+
+#endif /* configUSE_TRACE_FACILITY */
+/*-----------------------------------------------------------*/
+
+#if ( configUSE_TRACE_FACILITY == 1 )
+
+    void vEventGroupSetNumber( void * xEventGroup,
+                               UBaseType_t uxEventGroupNumber )
+    {
+        ( ( EventGroup_t * ) xEventGroup )->uxEventGroupNumber = uxEventGroupNumber; /*lint !e9087 !e9079 EventGroupHandle_t is a pointer to an EventGroup_t, but EventGroupHandle_t is kept opaque outside of this file for data hiding purposes. */
+    }
+
+#endif /* configUSE_TRACE_FACILITY */
+/*-----------------------------------------------------------*/

freertos/Source/include/StackMacros.h

@@ -0,0 +1,34 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+
+#ifndef _MSC_VER /* Visual Studio doesn't support #warning. */
+    #warning The name of this file has changed to stack_macros.h.  Please update your code accordingly.  This source file (which has the original name) will be removed in future released.
+#endif
+
+#include "stack_macros.h"

freertos/Source/include/atomic.h

@@ -0,0 +1,419 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+/**
+ * @file atomic.h
+ * @brief FreeRTOS atomic operation support.
+ *
+ * This file implements atomic functions by disabling interrupts globally.
+ * Implementations with architecture specific atomic instructions can be
+ * provided under each compiler directory.
+ */
+
+#ifndef ATOMIC_H
+#define ATOMIC_H
+
+#ifndef INC_FREERTOS_H
+    #error "include FreeRTOS.h must appear in source files before include atomic.h"
+#endif
+
+/* Standard includes. */
+#include <stdint.h>
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+    extern "C" {
+#endif
+/* *INDENT-ON* */
+
+/*
+ * Port specific definitions -- entering/exiting critical section.
+ * Refer template -- ./lib/FreeRTOS/portable/Compiler/Arch/portmacro.h
+ *
+ * Every call to ATOMIC_EXIT_CRITICAL() must be closely paired with
+ * ATOMIC_ENTER_CRITICAL().
+ *
+ */
+#if defined( portSET_INTERRUPT_MASK_FROM_ISR )
+
+/* Nested interrupt scheme is supported in this port. */
+    #define ATOMIC_ENTER_CRITICAL() \
+    UBaseType_t uxCriticalSectionType = portSET_INTERRUPT_MASK_FROM_ISR()
+
+    #define ATOMIC_EXIT_CRITICAL() \
+    portCLEAR_INTERRUPT_MASK_FROM_ISR( uxCriticalSectionType )
+
+#else
+
+/* Nested interrupt scheme is NOT supported in this port. */
+    #define ATOMIC_ENTER_CRITICAL()    portENTER_CRITICAL()
+    #define ATOMIC_EXIT_CRITICAL()     portEXIT_CRITICAL()
+
+#endif /* portSET_INTERRUPT_MASK_FROM_ISR() */
+
+/*
+ * Port specific definition -- "always inline".
+ * Inline is compiler specific, and may not always get inlined depending on your
+ * optimization level.  Also, inline is considered as performance optimization
+ * for atomic.  Thus, if portFORCE_INLINE is not provided by portmacro.h,
+ * instead of resulting error, simply define it away.
+ */
+#ifndef portFORCE_INLINE
+    #define portFORCE_INLINE
+#endif
+
+#define ATOMIC_COMPARE_AND_SWAP_SUCCESS    0x1U     /**< Compare and swap succeeded, swapped. */
+#define ATOMIC_COMPARE_AND_SWAP_FAILURE    0x0U     /**< Compare and swap failed, did not swap. */
+
+/*----------------------------- Swap && CAS ------------------------------*/
+
+/**
+ * Atomic compare-and-swap
+ *
+ * @brief Performs an atomic compare-and-swap operation on the specified values.
+ *
+ * @param[in, out] pulDestination  Pointer to memory location from where value is
+ *                               to be loaded and checked.
+ * @param[in] ulExchange         If condition meets, write this value to memory.
+ * @param[in] ulComparand        Swap condition.
+ *
+ * @return Unsigned integer of value 1 or 0. 1 for swapped, 0 for not swapped.
+ *
+ * @note This function only swaps *pulDestination with ulExchange, if previous
+ *       *pulDestination value equals ulComparand.
+ */
+static portFORCE_INLINE uint32_t Atomic_CompareAndSwap_u32( uint32_t volatile * pulDestination,
+                                                            uint32_t ulExchange,
+                                                            uint32_t ulComparand )
+{
+    uint32_t ulReturnValue;
+
+    ATOMIC_ENTER_CRITICAL();
+    {
+        if( *pulDestination == ulComparand )
+        {
+            *pulDestination = ulExchange;
+            ulReturnValue = ATOMIC_COMPARE_AND_SWAP_SUCCESS;
+        }
+        else
+        {
+            ulReturnValue = ATOMIC_COMPARE_AND_SWAP_FAILURE;
+        }
+    }
+    ATOMIC_EXIT_CRITICAL();
+
+    return ulReturnValue;
+}
+/*-----------------------------------------------------------*/
+
+/**
+ * Atomic swap (pointers)
+ *
+ * @brief Atomically sets the address pointed to by *ppvDestination to the value
+ *        of *pvExchange.
+ *
+ * @param[in, out] ppvDestination  Pointer to memory location from where a pointer
+ *                                 value is to be loaded and written back to.
+ * @param[in] pvExchange           Pointer value to be written to *ppvDestination.
+ *
+ * @return The initial value of *ppvDestination.
+ */
+static portFORCE_INLINE void * Atomic_SwapPointers_p32( void * volatile * ppvDestination,
+                                                        void * pvExchange )
+{
+    void * pReturnValue;
+
+    ATOMIC_ENTER_CRITICAL();
+    {
+        pReturnValue = *ppvDestination;
+        *ppvDestination = pvExchange;
+    }
+    ATOMIC_EXIT_CRITICAL();
+
+    return pReturnValue;
+}
+/*-----------------------------------------------------------*/
+
+/**
+ * Atomic compare-and-swap (pointers)
+ *
+ * @brief Performs an atomic compare-and-swap operation on the specified pointer
+ *        values.
+ *
+ * @param[in, out] ppvDestination  Pointer to memory location from where a pointer
+ *                                 value is to be loaded and checked.
+ * @param[in] pvExchange           If condition meets, write this value to memory.
+ * @param[in] pvComparand          Swap condition.
+ *
+ * @return Unsigned integer of value 1 or 0. 1 for swapped, 0 for not swapped.
+ *
+ * @note This function only swaps *ppvDestination with pvExchange, if previous
+ *       *ppvDestination value equals pvComparand.
+ */
+static portFORCE_INLINE uint32_t Atomic_CompareAndSwapPointers_p32( void * volatile * ppvDestination,
+                                                                    void * pvExchange,
+                                                                    void * pvComparand )
+{
+    uint32_t ulReturnValue = ATOMIC_COMPARE_AND_SWAP_FAILURE;
+
+    ATOMIC_ENTER_CRITICAL();
+    {
+        if( *ppvDestination == pvComparand )
+        {
+            *ppvDestination = pvExchange;
+            ulReturnValue = ATOMIC_COMPARE_AND_SWAP_SUCCESS;
+        }
+    }
+    ATOMIC_EXIT_CRITICAL();
+
+    return ulReturnValue;
+}
+
+
+/*----------------------------- Arithmetic ------------------------------*/
+
+/**
+ * Atomic add
+ *
+ * @brief Atomically adds count to the value of the specified pointer points to.
+ *
+ * @param[in,out] pulAddend  Pointer to memory location from where value is to be
+ *                         loaded and written back to.
+ * @param[in] ulCount      Value to be added to *pulAddend.
+ *
+ * @return previous *pulAddend value.
+ */
+static portFORCE_INLINE uint32_t Atomic_Add_u32( uint32_t volatile * pulAddend,
+                                                 uint32_t ulCount )
+{
+    uint32_t ulCurrent;
+
+    ATOMIC_ENTER_CRITICAL();
+    {
+        ulCurrent = *pulAddend;
+        *pulAddend += ulCount;
+    }
+    ATOMIC_EXIT_CRITICAL();
+
+    return ulCurrent;
+}
+/*-----------------------------------------------------------*/
+
+/**
+ * Atomic subtract
+ *
+ * @brief Atomically subtracts count from the value of the specified pointer
+ *        pointers to.
+ *
+ * @param[in,out] pulAddend  Pointer to memory location from where value is to be
+ *                         loaded and written back to.
+ * @param[in] ulCount      Value to be subtract from *pulAddend.
+ *
+ * @return previous *pulAddend value.
+ */
+static portFORCE_INLINE uint32_t Atomic_Subtract_u32( uint32_t volatile * pulAddend,
+                                                      uint32_t ulCount )
+{
+    uint32_t ulCurrent;
+
+    ATOMIC_ENTER_CRITICAL();
+    {
+        ulCurrent = *pulAddend;
+        *pulAddend -= ulCount;
+    }
+    ATOMIC_EXIT_CRITICAL();
+
+    return ulCurrent;
+}
+/*-----------------------------------------------------------*/
+
+/**
+ * Atomic increment
+ *
+ * @brief Atomically increments the value of the specified pointer points to.
+ *
+ * @param[in,out] pulAddend  Pointer to memory location from where value is to be
+ *                         loaded and written back to.
+ *
+ * @return *pulAddend value before increment.
+ */
+static portFORCE_INLINE uint32_t Atomic_Increment_u32( uint32_t volatile * pulAddend )
+{
+    uint32_t ulCurrent;
+
+    ATOMIC_ENTER_CRITICAL();
+    {
+        ulCurrent = *pulAddend;
+        *pulAddend += 1;
+    }
+    ATOMIC_EXIT_CRITICAL();
+
+    return ulCurrent;
+}
+/*-----------------------------------------------------------*/
+
+/**
+ * Atomic decrement
+ *
+ * @brief Atomically decrements the value of the specified pointer points to
+ *
+ * @param[in,out] pulAddend  Pointer to memory location from where value is to be
+ *                         loaded and written back to.
+ *
+ * @return *pulAddend value before decrement.
+ */
+static portFORCE_INLINE uint32_t Atomic_Decrement_u32( uint32_t volatile * pulAddend )
+{
+    uint32_t ulCurrent;
+
+    ATOMIC_ENTER_CRITICAL();
+    {
+        ulCurrent = *pulAddend;
+        *pulAddend -= 1;
+    }
+    ATOMIC_EXIT_CRITICAL();
+
+    return ulCurrent;
+}
+
+/*----------------------------- Bitwise Logical ------------------------------*/
+
+/**
+ * Atomic OR
+ *
+ * @brief Performs an atomic OR operation on the specified values.
+ *
+ * @param [in, out] pulDestination  Pointer to memory location from where value is
+ *                                to be loaded and written back to.
+ * @param [in] ulValue            Value to be ORed with *pulDestination.
+ *
+ * @return The original value of *pulDestination.
+ */
+static portFORCE_INLINE uint32_t Atomic_OR_u32( uint32_t volatile * pulDestination,
+                                                uint32_t ulValue )
+{
+    uint32_t ulCurrent;
+
+    ATOMIC_ENTER_CRITICAL();
+    {
+        ulCurrent = *pulDestination;
+        *pulDestination |= ulValue;
+    }
+    ATOMIC_EXIT_CRITICAL();
+
+    return ulCurrent;
+}
+/*-----------------------------------------------------------*/
+
+/**
+ * Atomic AND
+ *
+ * @brief Performs an atomic AND operation on the specified values.
+ *
+ * @param [in, out] pulDestination  Pointer to memory location from where value is
+ *                                to be loaded and written back to.
+ * @param [in] ulValue            Value to be ANDed with *pulDestination.
+ *
+ * @return The original value of *pulDestination.
+ */
+static portFORCE_INLINE uint32_t Atomic_AND_u32( uint32_t volatile * pulDestination,
+                                                 uint32_t ulValue )
+{
+    uint32_t ulCurrent;
+
+    ATOMIC_ENTER_CRITICAL();
+    {
+        ulCurrent = *pulDestination;
+        *pulDestination &= ulValue;
+    }
+    ATOMIC_EXIT_CRITICAL();
+
+    return ulCurrent;
+}
+/*-----------------------------------------------------------*/
+
+/**
+ * Atomic NAND
+ *
+ * @brief Performs an atomic NAND operation on the specified values.
+ *
+ * @param [in, out] pulDestination  Pointer to memory location from where value is
+ *                                to be loaded and written back to.
+ * @param [in] ulValue            Value to be NANDed with *pulDestination.
+ *
+ * @return The original value of *pulDestination.
+ */
+static portFORCE_INLINE uint32_t Atomic_NAND_u32( uint32_t volatile * pulDestination,
+                                                  uint32_t ulValue )
+{
+    uint32_t ulCurrent;
+
+    ATOMIC_ENTER_CRITICAL();
+    {
+        ulCurrent = *pulDestination;
+        *pulDestination = ~( ulCurrent & ulValue );
+    }
+    ATOMIC_EXIT_CRITICAL();
+
+    return ulCurrent;
+}
+/*-----------------------------------------------------------*/
+
+/**
+ * Atomic XOR
+ *
+ * @brief Performs an atomic XOR operation on the specified values.
+ *
+ * @param [in, out] pulDestination  Pointer to memory location from where value is
+ *                                to be loaded and written back to.
+ * @param [in] ulValue            Value to be XORed with *pulDestination.
+ *
+ * @return The original value of *pulDestination.
+ */
+static portFORCE_INLINE uint32_t Atomic_XOR_u32( uint32_t volatile * pulDestination,
+                                                 uint32_t ulValue )
+{
+    uint32_t ulCurrent;
+
+    ATOMIC_ENTER_CRITICAL();
+    {
+        ulCurrent = *pulDestination;
+        *pulDestination ^= ulValue;
+    }
+    ATOMIC_EXIT_CRITICAL();
+
+    return ulCurrent;
+}
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+    }
+#endif
+/* *INDENT-ON* */
+
+#endif /* ATOMIC_H */

freertos/Source/include/croutine.h

@@ -0,0 +1,753 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef CO_ROUTINE_H
+#define CO_ROUTINE_H
+
+#ifndef INC_FREERTOS_H
+    #error "include FreeRTOS.h must appear in source files before include croutine.h"
+#endif
+
+#include "list.h"
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+    extern "C" {
+#endif
+/* *INDENT-ON* */
+
+/* Used to hide the implementation of the co-routine control block.  The
+ * control block structure however has to be included in the header due to
+ * the macro implementation of the co-routine functionality. */
+typedef void * CoRoutineHandle_t;
+
+/* Defines the prototype to which co-routine functions must conform. */
+typedef void (* crCOROUTINE_CODE)( CoRoutineHandle_t,
+                                   UBaseType_t );
+
+typedef struct corCoRoutineControlBlock
+{
+    crCOROUTINE_CODE pxCoRoutineFunction;
+    ListItem_t xGenericListItem; /*< List item used to place the CRCB in ready and blocked queues. */
+    ListItem_t xEventListItem;   /*< List item used to place the CRCB in event lists. */
+    UBaseType_t uxPriority;      /*< The priority of the co-routine in relation to other co-routines. */
+    UBaseType_t uxIndex;         /*< Used to distinguish between co-routines when multiple co-routines use the same co-routine function. */
+    uint16_t uxState;            /*< Used internally by the co-routine implementation. */
+} CRCB_t;                        /* Co-routine control block.  Note must be identical in size down to uxPriority with TCB_t. */
+
+/**
+ * croutine. h
+ * @code{c}
+ * BaseType_t xCoRoutineCreate(
+ *                               crCOROUTINE_CODE pxCoRoutineCode,
+ *                               UBaseType_t uxPriority,
+ *                               UBaseType_t uxIndex
+ *                             );
+ * @endcode
+ *
+ * Create a new co-routine and add it to the list of co-routines that are
+ * ready to run.
+ *
+ * @param pxCoRoutineCode Pointer to the co-routine function.  Co-routine
+ * functions require special syntax - see the co-routine section of the WEB
+ * documentation for more information.
+ *
+ * @param uxPriority The priority with respect to other co-routines at which
+ *  the co-routine will run.
+ *
+ * @param uxIndex Used to distinguish between different co-routines that
+ * execute the same function.  See the example below and the co-routine section
+ * of the WEB documentation for further information.
+ *
+ * @return pdPASS if the co-routine was successfully created and added to a ready
+ * list, otherwise an error code defined with ProjDefs.h.
+ *
+ * Example usage:
+ * @code{c}
+ * // Co-routine to be created.
+ * void vFlashCoRoutine( CoRoutineHandle_t xHandle, UBaseType_t uxIndex )
+ * {
+ * // Variables in co-routines must be declared static if they must maintain value across a blocking call.
+ * // This may not be necessary for const variables.
+ * static const char cLedToFlash[ 2 ] = { 5, 6 };
+ * static const TickType_t uxFlashRates[ 2 ] = { 200, 400 };
+ *
+ *   // Must start every co-routine with a call to crSTART();
+ *   crSTART( xHandle );
+ *
+ *   for( ;; )
+ *   {
+ *       // This co-routine just delays for a fixed period, then toggles
+ *       // an LED.  Two co-routines are created using this function, so
+ *       // the uxIndex parameter is used to tell the co-routine which
+ *       // LED to flash and how int32_t to delay.  This assumes xQueue has
+ *       // already been created.
+ *       vParTestToggleLED( cLedToFlash[ uxIndex ] );
+ *       crDELAY( xHandle, uxFlashRates[ uxIndex ] );
+ *   }
+ *
+ *   // Must end every co-routine with a call to crEND();
+ *   crEND();
+ * }
+ *
+ * // Function that creates two co-routines.
+ * void vOtherFunction( void )
+ * {
+ * uint8_t ucParameterToPass;
+ * TaskHandle_t xHandle;
+ *
+ *   // Create two co-routines at priority 0.  The first is given index 0
+ *   // so (from the code above) toggles LED 5 every 200 ticks.  The second
+ *   // is given index 1 so toggles LED 6 every 400 ticks.
+ *   for( uxIndex = 0; uxIndex < 2; uxIndex++ )
+ *   {
+ *       xCoRoutineCreate( vFlashCoRoutine, 0, uxIndex );
+ *   }
+ * }
+ * @endcode
+ * \defgroup xCoRoutineCreate xCoRoutineCreate
+ * \ingroup Tasks
+ */
+BaseType_t xCoRoutineCreate( crCOROUTINE_CODE pxCoRoutineCode,
+                             UBaseType_t uxPriority,
+                             UBaseType_t uxIndex );
+
+
+/**
+ * croutine. h
+ * @code{c}
+ * void vCoRoutineSchedule( void );
+ * @endcode
+ *
+ * Run a co-routine.
+ *
+ * vCoRoutineSchedule() executes the highest priority co-routine that is able
+ * to run.  The co-routine will execute until it either blocks, yields or is
+ * preempted by a task.  Co-routines execute cooperatively so one
+ * co-routine cannot be preempted by another, but can be preempted by a task.
+ *
+ * If an application comprises of both tasks and co-routines then
+ * vCoRoutineSchedule should be called from the idle task (in an idle task
+ * hook).
+ *
+ * Example usage:
+ * @code{c}
+ * // This idle task hook will schedule a co-routine each time it is called.
+ * // The rest of the idle task will execute between co-routine calls.
+ * void vApplicationIdleHook( void )
+ * {
+ *  vCoRoutineSchedule();
+ * }
+ *
+ * // Alternatively, if you do not require any other part of the idle task to
+ * // execute, the idle task hook can call vCoRoutineSchedule() within an
+ * // infinite loop.
+ * void vApplicationIdleHook( void )
+ * {
+ *  for( ;; )
+ *  {
+ *      vCoRoutineSchedule();
+ *  }
+ * }
+ * @endcode
+ * \defgroup vCoRoutineSchedule vCoRoutineSchedule
+ * \ingroup Tasks
+ */
+void vCoRoutineSchedule( void );
+
+/**
+ * croutine. h
+ * @code{c}
+ * crSTART( CoRoutineHandle_t xHandle );
+ * @endcode
+ *
+ * This macro MUST always be called at the start of a co-routine function.
+ *
+ * Example usage:
+ * @code{c}
+ * // Co-routine to be created.
+ * void vACoRoutine( CoRoutineHandle_t xHandle, UBaseType_t uxIndex )
+ * {
+ * // Variables in co-routines must be declared static if they must maintain value across a blocking call.
+ * static int32_t ulAVariable;
+ *
+ *   // Must start every co-routine with a call to crSTART();
+ *   crSTART( xHandle );
+ *
+ *   for( ;; )
+ *   {
+ *        // Co-routine functionality goes here.
+ *   }
+ *
+ *   // Must end every co-routine with a call to crEND();
+ *   crEND();
+ * }
+ * @endcode
+ * \defgroup crSTART crSTART
+ * \ingroup Tasks
+ */
+#define crSTART( pxCRCB )                            \
+    switch( ( ( CRCB_t * ) ( pxCRCB ) )->uxState ) { \
+        case 0:
+
+/**
+ * croutine. h
+ * @code{c}
+ * crEND();
+ * @endcode
+ *
+ * This macro MUST always be called at the end of a co-routine function.
+ *
+ * Example usage:
+ * @code{c}
+ * // Co-routine to be created.
+ * void vACoRoutine( CoRoutineHandle_t xHandle, UBaseType_t uxIndex )
+ * {
+ * // Variables in co-routines must be declared static if they must maintain value across a blocking call.
+ * static int32_t ulAVariable;
+ *
+ *   // Must start every co-routine with a call to crSTART();
+ *   crSTART( xHandle );
+ *
+ *   for( ;; )
+ *   {
+ *        // Co-routine functionality goes here.
+ *   }
+ *
+ *   // Must end every co-routine with a call to crEND();
+ *   crEND();
+ * }
+ * @endcode
+ * \defgroup crSTART crSTART
+ * \ingroup Tasks
+ */
+#define crEND()    }
+
+/*
+ * These macros are intended for internal use by the co-routine implementation
+ * only.  The macros should not be used directly by application writers.
+ */
+#define crSET_STATE0( xHandle )                                       \
+    ( ( CRCB_t * ) ( xHandle ) )->uxState = ( __LINE__ * 2 ); return; \
+    case ( __LINE__ * 2 ):
+#define crSET_STATE1( xHandle )                                               \
+    ( ( CRCB_t * ) ( xHandle ) )->uxState = ( ( __LINE__ * 2 ) + 1 ); return; \
+    case ( ( __LINE__ * 2 ) + 1 ):
+
+/**
+ * croutine. h
+ * @code{c}
+ * crDELAY( CoRoutineHandle_t xHandle, TickType_t xTicksToDelay );
+ * @endcode
+ *
+ * Delay a co-routine for a fixed period of time.
+ *
+ * crDELAY can only be called from the co-routine function itself - not
+ * from within a function called by the co-routine function.  This is because
+ * co-routines do not maintain their own stack.
+ *
+ * @param xHandle The handle of the co-routine to delay.  This is the xHandle
+ * parameter of the co-routine function.
+ *
+ * @param xTickToDelay The number of ticks that the co-routine should delay
+ * for.  The actual amount of time this equates to is defined by
+ * configTICK_RATE_HZ (set in FreeRTOSConfig.h).  The constant portTICK_PERIOD_MS
+ * can be used to convert ticks to milliseconds.
+ *
+ * Example usage:
+ * @code{c}
+ * // Co-routine to be created.
+ * void vACoRoutine( CoRoutineHandle_t xHandle, UBaseType_t uxIndex )
+ * {
+ * // Variables in co-routines must be declared static if they must maintain value across a blocking call.
+ * // This may not be necessary for const variables.
+ * // We are to delay for 200ms.
+ * static const xTickType xDelayTime = 200 / portTICK_PERIOD_MS;
+ *
+ *   // Must start every co-routine with a call to crSTART();
+ *   crSTART( xHandle );
+ *
+ *   for( ;; )
+ *   {
+ *      // Delay for 200ms.
+ *      crDELAY( xHandle, xDelayTime );
+ *
+ *      // Do something here.
+ *   }
+ *
+ *   // Must end every co-routine with a call to crEND();
+ *   crEND();
+ * }
+ * @endcode
+ * \defgroup crDELAY crDELAY
+ * \ingroup Tasks
+ */
+#define crDELAY( xHandle, xTicksToDelay )                      \
+    if( ( xTicksToDelay ) > 0 )                                \
+    {                                                          \
+        vCoRoutineAddToDelayedList( ( xTicksToDelay ), NULL ); \
+    }                                                          \
+    crSET_STATE0( ( xHandle ) );
+
+/**
+ * @code{c}
+ * crQUEUE_SEND(
+ *                CoRoutineHandle_t xHandle,
+ *                QueueHandle_t pxQueue,
+ *                void *pvItemToQueue,
+ *                TickType_t xTicksToWait,
+ *                BaseType_t *pxResult
+ *           )
+ * @endcode
+ *
+ * The macro's crQUEUE_SEND() and crQUEUE_RECEIVE() are the co-routine
+ * equivalent to the xQueueSend() and xQueueReceive() functions used by tasks.
+ *
+ * crQUEUE_SEND and crQUEUE_RECEIVE can only be used from a co-routine whereas
+ * xQueueSend() and xQueueReceive() can only be used from tasks.
+ *
+ * crQUEUE_SEND can only be called from the co-routine function itself - not
+ * from within a function called by the co-routine function.  This is because
+ * co-routines do not maintain their own stack.
+ *
+ * See the co-routine section of the WEB documentation for information on
+ * passing data between tasks and co-routines and between ISR's and
+ * co-routines.
+ *
+ * @param xHandle The handle of the calling co-routine.  This is the xHandle
+ * parameter of the co-routine function.
+ *
+ * @param pxQueue The handle of the queue on which the data will be posted.
+ * The handle is obtained as the return value when the queue is created using
+ * the xQueueCreate() API function.
+ *
+ * @param pvItemToQueue A pointer to the data being posted onto the queue.
+ * The number of bytes of each queued item is specified when the queue is
+ * created.  This number of bytes is copied from pvItemToQueue into the queue
+ * itself.
+ *
+ * @param xTickToDelay The number of ticks that the co-routine should block
+ * to wait for space to become available on the queue, should space not be
+ * available immediately. The actual amount of time this equates to is defined
+ * by configTICK_RATE_HZ (set in FreeRTOSConfig.h).  The constant
+ * portTICK_PERIOD_MS can be used to convert ticks to milliseconds (see example
+ * below).
+ *
+ * @param pxResult The variable pointed to by pxResult will be set to pdPASS if
+ * data was successfully posted onto the queue, otherwise it will be set to an
+ * error defined within ProjDefs.h.
+ *
+ * Example usage:
+ * @code{c}
+ * // Co-routine function that blocks for a fixed period then posts a number onto
+ * // a queue.
+ * static void prvCoRoutineFlashTask( CoRoutineHandle_t xHandle, UBaseType_t uxIndex )
+ * {
+ * // Variables in co-routines must be declared static if they must maintain value across a blocking call.
+ * static BaseType_t xNumberToPost = 0;
+ * static BaseType_t xResult;
+ *
+ *  // Co-routines must begin with a call to crSTART().
+ *  crSTART( xHandle );
+ *
+ *  for( ;; )
+ *  {
+ *      // This assumes the queue has already been created.
+ *      crQUEUE_SEND( xHandle, xCoRoutineQueue, &xNumberToPost, NO_DELAY, &xResult );
+ *
+ *      if( xResult != pdPASS )
+ *      {
+ *          // The message was not posted!
+ *      }
+ *
+ *      // Increment the number to be posted onto the queue.
+ *      xNumberToPost++;
+ *
+ *      // Delay for 100 ticks.
+ *      crDELAY( xHandle, 100 );
+ *  }
+ *
+ *  // Co-routines must end with a call to crEND().
+ *  crEND();
+ * }
+ * @endcode
+ * \defgroup crQUEUE_SEND crQUEUE_SEND
+ * \ingroup Tasks
+ */
+#define crQUEUE_SEND( xHandle, pxQueue, pvItemToQueue, xTicksToWait, pxResult )           \
+    {                                                                                     \
+        *( pxResult ) = xQueueCRSend( ( pxQueue ), ( pvItemToQueue ), ( xTicksToWait ) ); \
+        if( *( pxResult ) == errQUEUE_BLOCKED )                                           \
+        {                                                                                 \
+            crSET_STATE0( ( xHandle ) );                                                  \
+            *pxResult = xQueueCRSend( ( pxQueue ), ( pvItemToQueue ), 0 );                \
+        }                                                                                 \
+        if( *pxResult == errQUEUE_YIELD )                                                 \
+        {                                                                                 \
+            crSET_STATE1( ( xHandle ) );                                                  \
+            *pxResult = pdPASS;                                                           \
+        }                                                                                 \
+    }
+
+/**
+ * croutine. h
+ * @code{c}
+ * crQUEUE_RECEIVE(
+ *                   CoRoutineHandle_t xHandle,
+ *                   QueueHandle_t pxQueue,
+ *                   void *pvBuffer,
+ *                   TickType_t xTicksToWait,
+ *                   BaseType_t *pxResult
+ *               )
+ * @endcode
+ *
+ * The macro's crQUEUE_SEND() and crQUEUE_RECEIVE() are the co-routine
+ * equivalent to the xQueueSend() and xQueueReceive() functions used by tasks.
+ *
+ * crQUEUE_SEND and crQUEUE_RECEIVE can only be used from a co-routine whereas
+ * xQueueSend() and xQueueReceive() can only be used from tasks.
+ *
+ * crQUEUE_RECEIVE can only be called from the co-routine function itself - not
+ * from within a function called by the co-routine function.  This is because
+ * co-routines do not maintain their own stack.
+ *
+ * See the co-routine section of the WEB documentation for information on
+ * passing data between tasks and co-routines and between ISR's and
+ * co-routines.
+ *
+ * @param xHandle The handle of the calling co-routine.  This is the xHandle
+ * parameter of the co-routine function.
+ *
+ * @param pxQueue The handle of the queue from which the data will be received.
+ * The handle is obtained as the return value when the queue is created using
+ * the xQueueCreate() API function.
+ *
+ * @param pvBuffer The buffer into which the received item is to be copied.
+ * The number of bytes of each queued item is specified when the queue is
+ * created.  This number of bytes is copied into pvBuffer.
+ *
+ * @param xTickToDelay The number of ticks that the co-routine should block
+ * to wait for data to become available from the queue, should data not be
+ * available immediately. The actual amount of time this equates to is defined
+ * by configTICK_RATE_HZ (set in FreeRTOSConfig.h).  The constant
+ * portTICK_PERIOD_MS can be used to convert ticks to milliseconds (see the
+ * crQUEUE_SEND example).
+ *
+ * @param pxResult The variable pointed to by pxResult will be set to pdPASS if
+ * data was successfully retrieved from the queue, otherwise it will be set to
+ * an error code as defined within ProjDefs.h.
+ *
+ * Example usage:
+ * @code{c}
+ * // A co-routine receives the number of an LED to flash from a queue.  It
+ * // blocks on the queue until the number is received.
+ * static void prvCoRoutineFlashWorkTask( CoRoutineHandle_t xHandle, UBaseType_t uxIndex )
+ * {
+ * // Variables in co-routines must be declared static if they must maintain value across a blocking call.
+ * static BaseType_t xResult;
+ * static UBaseType_t uxLEDToFlash;
+ *
+ *  // All co-routines must start with a call to crSTART().
+ *  crSTART( xHandle );
+ *
+ *  for( ;; )
+ *  {
+ *      // Wait for data to become available on the queue.
+ *      crQUEUE_RECEIVE( xHandle, xCoRoutineQueue, &uxLEDToFlash, portMAX_DELAY, &xResult );
+ *
+ *      if( xResult == pdPASS )
+ *      {
+ *          // We received the LED to flash - flash it!
+ *          vParTestToggleLED( uxLEDToFlash );
+ *      }
+ *  }
+ *
+ *  crEND();
+ * }
+ * @endcode
+ * \defgroup crQUEUE_RECEIVE crQUEUE_RECEIVE
+ * \ingroup Tasks
+ */
+#define crQUEUE_RECEIVE( xHandle, pxQueue, pvBuffer, xTicksToWait, pxResult )           \
+    {                                                                                   \
+        *( pxResult ) = xQueueCRReceive( ( pxQueue ), ( pvBuffer ), ( xTicksToWait ) ); \
+        if( *( pxResult ) == errQUEUE_BLOCKED )                                         \
+        {                                                                               \
+            crSET_STATE0( ( xHandle ) );                                                \
+            *( pxResult ) = xQueueCRReceive( ( pxQueue ), ( pvBuffer ), 0 );            \
+        }                                                                               \
+        if( *( pxResult ) == errQUEUE_YIELD )                                           \
+        {                                                                               \
+            crSET_STATE1( ( xHandle ) );                                                \
+            *( pxResult ) = pdPASS;                                                     \
+        }                                                                               \
+    }
+
+/**
+ * croutine. h
+ * @code{c}
+ * crQUEUE_SEND_FROM_ISR(
+ *                          QueueHandle_t pxQueue,
+ *                          void *pvItemToQueue,
+ *                          BaseType_t xCoRoutinePreviouslyWoken
+ *                     )
+ * @endcode
+ *
+ * The macro's crQUEUE_SEND_FROM_ISR() and crQUEUE_RECEIVE_FROM_ISR() are the
+ * co-routine equivalent to the xQueueSendFromISR() and xQueueReceiveFromISR()
+ * functions used by tasks.
+ *
+ * crQUEUE_SEND_FROM_ISR() and crQUEUE_RECEIVE_FROM_ISR() can only be used to
+ * pass data between a co-routine and and ISR, whereas xQueueSendFromISR() and
+ * xQueueReceiveFromISR() can only be used to pass data between a task and and
+ * ISR.
+ *
+ * crQUEUE_SEND_FROM_ISR can only be called from an ISR to send data to a queue
+ * that is being used from within a co-routine.
+ *
+ * See the co-routine section of the WEB documentation for information on
+ * passing data between tasks and co-routines and between ISR's and
+ * co-routines.
+ *
+ * @param xQueue The handle to the queue on which the item is to be posted.
+ *
+ * @param pvItemToQueue A pointer to the item that is to be placed on the
+ * queue.  The size of the items the queue will hold was defined when the
+ * queue was created, so this many bytes will be copied from pvItemToQueue
+ * into the queue storage area.
+ *
+ * @param xCoRoutinePreviouslyWoken This is included so an ISR can post onto
+ * the same queue multiple times from a single interrupt.  The first call
+ * should always pass in pdFALSE.  Subsequent calls should pass in
+ * the value returned from the previous call.
+ *
+ * @return pdTRUE if a co-routine was woken by posting onto the queue.  This is
+ * used by the ISR to determine if a context switch may be required following
+ * the ISR.
+ *
+ * Example usage:
+ * @code{c}
+ * // A co-routine that blocks on a queue waiting for characters to be received.
+ * static void vReceivingCoRoutine( CoRoutineHandle_t xHandle, UBaseType_t uxIndex )
+ * {
+ * char cRxedChar;
+ * BaseType_t xResult;
+ *
+ *   // All co-routines must start with a call to crSTART().
+ *   crSTART( xHandle );
+ *
+ *   for( ;; )
+ *   {
+ *       // Wait for data to become available on the queue.  This assumes the
+ *       // queue xCommsRxQueue has already been created!
+ *       crQUEUE_RECEIVE( xHandle, xCommsRxQueue, &uxLEDToFlash, portMAX_DELAY, &xResult );
+ *
+ *       // Was a character received?
+ *       if( xResult == pdPASS )
+ *       {
+ *           // Process the character here.
+ *       }
+ *   }
+ *
+ *   // All co-routines must end with a call to crEND().
+ *   crEND();
+ * }
+ *
+ * // An ISR that uses a queue to send characters received on a serial port to
+ * // a co-routine.
+ * void vUART_ISR( void )
+ * {
+ * char cRxedChar;
+ * BaseType_t xCRWokenByPost = pdFALSE;
+ *
+ *   // We loop around reading characters until there are none left in the UART.
+ *   while( UART_RX_REG_NOT_EMPTY() )
+ *   {
+ *       // Obtain the character from the UART.
+ *       cRxedChar = UART_RX_REG;
+ *
+ *       // Post the character onto a queue.  xCRWokenByPost will be pdFALSE
+ *       // the first time around the loop.  If the post causes a co-routine
+ *       // to be woken (unblocked) then xCRWokenByPost will be set to pdTRUE.
+ *       // In this manner we can ensure that if more than one co-routine is
+ *       // blocked on the queue only one is woken by this ISR no matter how
+ *       // many characters are posted to the queue.
+ *       xCRWokenByPost = crQUEUE_SEND_FROM_ISR( xCommsRxQueue, &cRxedChar, xCRWokenByPost );
+ *   }
+ * }
+ * @endcode
+ * \defgroup crQUEUE_SEND_FROM_ISR crQUEUE_SEND_FROM_ISR
+ * \ingroup Tasks
+ */
+#define crQUEUE_SEND_FROM_ISR( pxQueue, pvItemToQueue, xCoRoutinePreviouslyWoken ) \
+    xQueueCRSendFromISR( ( pxQueue ), ( pvItemToQueue ), ( xCoRoutinePreviouslyWoken ) )
+
+
+/**
+ * croutine. h
+ * @code{c}
+ * crQUEUE_SEND_FROM_ISR(
+ *                          QueueHandle_t pxQueue,
+ *                          void *pvBuffer,
+ *                          BaseType_t * pxCoRoutineWoken
+ *                     )
+ * @endcode
+ *
+ * The macro's crQUEUE_SEND_FROM_ISR() and crQUEUE_RECEIVE_FROM_ISR() are the
+ * co-routine equivalent to the xQueueSendFromISR() and xQueueReceiveFromISR()
+ * functions used by tasks.
+ *
+ * crQUEUE_SEND_FROM_ISR() and crQUEUE_RECEIVE_FROM_ISR() can only be used to
+ * pass data between a co-routine and and ISR, whereas xQueueSendFromISR() and
+ * xQueueReceiveFromISR() can only be used to pass data between a task and and
+ * ISR.
+ *
+ * crQUEUE_RECEIVE_FROM_ISR can only be called from an ISR to receive data
+ * from a queue that is being used from within a co-routine (a co-routine
+ * posted to the queue).
+ *
+ * See the co-routine section of the WEB documentation for information on
+ * passing data between tasks and co-routines and between ISR's and
+ * co-routines.
+ *
+ * @param xQueue The handle to the queue on which the item is to be posted.
+ *
+ * @param pvBuffer A pointer to a buffer into which the received item will be
+ * placed.  The size of the items the queue will hold was defined when the
+ * queue was created, so this many bytes will be copied from the queue into
+ * pvBuffer.
+ *
+ * @param pxCoRoutineWoken A co-routine may be blocked waiting for space to become
+ * available on the queue.  If crQUEUE_RECEIVE_FROM_ISR causes such a
+ * co-routine to unblock *pxCoRoutineWoken will get set to pdTRUE, otherwise
+ * *pxCoRoutineWoken will remain unchanged.
+ *
+ * @return pdTRUE an item was successfully received from the queue, otherwise
+ * pdFALSE.
+ *
+ * Example usage:
+ * @code{c}
+ * // A co-routine that posts a character to a queue then blocks for a fixed
+ * // period.  The character is incremented each time.
+ * static void vSendingCoRoutine( CoRoutineHandle_t xHandle, UBaseType_t uxIndex )
+ * {
+ * // cChar holds its value while this co-routine is blocked and must therefore
+ * // be declared static.
+ * static char cCharToTx = 'a';
+ * BaseType_t xResult;
+ *
+ *   // All co-routines must start with a call to crSTART().
+ *   crSTART( xHandle );
+ *
+ *   for( ;; )
+ *   {
+ *       // Send the next character to the queue.
+ *       crQUEUE_SEND( xHandle, xCoRoutineQueue, &cCharToTx, NO_DELAY, &xResult );
+ *
+ *       if( xResult == pdPASS )
+ *       {
+ *           // The character was successfully posted to the queue.
+ *       }
+ *       else
+ *       {
+ *          // Could not post the character to the queue.
+ *       }
+ *
+ *       // Enable the UART Tx interrupt to cause an interrupt in this
+ *       // hypothetical UART.  The interrupt will obtain the character
+ *       // from the queue and send it.
+ *       ENABLE_RX_INTERRUPT();
+ *
+ *       // Increment to the next character then block for a fixed period.
+ *       // cCharToTx will maintain its value across the delay as it is
+ *       // declared static.
+ *       cCharToTx++;
+ *       if( cCharToTx > 'x' )
+ *       {
+ *          cCharToTx = 'a';
+ *       }
+ *       crDELAY( 100 );
+ *   }
+ *
+ *   // All co-routines must end with a call to crEND().
+ *   crEND();
+ * }
+ *
+ * // An ISR that uses a queue to receive characters to send on a UART.
+ * void vUART_ISR( void )
+ * {
+ * char cCharToTx;
+ * BaseType_t xCRWokenByPost = pdFALSE;
+ *
+ *   while( UART_TX_REG_EMPTY() )
+ *   {
+ *       // Are there any characters in the queue waiting to be sent?
+ *       // xCRWokenByPost will automatically be set to pdTRUE if a co-routine
+ *       // is woken by the post - ensuring that only a single co-routine is
+ *       // woken no matter how many times we go around this loop.
+ *       if( crQUEUE_RECEIVE_FROM_ISR( pxQueue, &cCharToTx, &xCRWokenByPost ) )
+ *       {
+ *           SEND_CHARACTER( cCharToTx );
+ *       }
+ *   }
+ * }
+ * @endcode
+ * \defgroup crQUEUE_RECEIVE_FROM_ISR crQUEUE_RECEIVE_FROM_ISR
+ * \ingroup Tasks
+ */
+#define crQUEUE_RECEIVE_FROM_ISR( pxQueue, pvBuffer, pxCoRoutineWoken ) \
+    xQueueCRReceiveFromISR( ( pxQueue ), ( pvBuffer ), ( pxCoRoutineWoken ) )
+
+/*
+ * This function is intended for internal use by the co-routine macros only.
+ * The macro nature of the co-routine implementation requires that the
+ * prototype appears here.  The function should not be used by application
+ * writers.
+ *
+ * Removes the current co-routine from its ready list and places it in the
+ * appropriate delayed list.
+ */
+void vCoRoutineAddToDelayedList( TickType_t xTicksToDelay,
+                                 List_t * pxEventList );
+
+/*
+ * This function is intended for internal use by the queue implementation only.
+ * The function should not be used by application writers.
+ *
+ * Removes the highest priority co-routine from the event list and places it in
+ * the pending ready list.
+ */
+BaseType_t xCoRoutineRemoveFromEventList( const List_t * pxEventList );
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+    }
+#endif
+/* *INDENT-ON* */
+
+#endif /* CO_ROUTINE_H */

freertos/Source/include/deprecated_definitions.h

@@ -0,0 +1,281 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef DEPRECATED_DEFINITIONS_H
+#define DEPRECATED_DEFINITIONS_H
+
+
+/* Each FreeRTOS port has a unique portmacro.h header file.  Originally a
+ * pre-processor definition was used to ensure the pre-processor found the correct
+ * portmacro.h file for the port being used.  That scheme was deprecated in favour
+ * of setting the compiler's include path such that it found the correct
+ * portmacro.h file - removing the need for the constant and allowing the
+ * portmacro.h file to be located anywhere in relation to the port being used.  The
+ * definitions below remain in the code for backward compatibility only.  New
+ * projects should not use them. */
+
+#ifdef OPEN_WATCOM_INDUSTRIAL_PC_PORT
+    #include "..\..\Source\portable\owatcom\16bitdos\pc\portmacro.h"
+    typedef void ( __interrupt __far * pxISR )();
+#endif
+
+#ifdef OPEN_WATCOM_FLASH_LITE_186_PORT
+    #include "..\..\Source\portable\owatcom\16bitdos\flsh186\portmacro.h"
+    typedef void ( __interrupt __far * pxISR )();
+#endif
+
+#ifdef GCC_MEGA_AVR
+    #include "../portable/GCC/ATMega323/portmacro.h"
+#endif
+
+#ifdef IAR_MEGA_AVR
+    #include "../portable/IAR/ATMega323/portmacro.h"
+#endif
+
+#ifdef MPLAB_PIC24_PORT
+    #include "../../Source/portable/MPLAB/PIC24_dsPIC/portmacro.h"
+#endif
+
+#ifdef MPLAB_DSPIC_PORT
+    #include "../../Source/portable/MPLAB/PIC24_dsPIC/portmacro.h"
+#endif
+
+#ifdef MPLAB_PIC18F_PORT
+    #include "../../Source/portable/MPLAB/PIC18F/portmacro.h"
+#endif
+
+#ifdef MPLAB_PIC32MX_PORT
+    #include "../../Source/portable/MPLAB/PIC32MX/portmacro.h"
+#endif
+
+#ifdef _FEDPICC
+    #include "libFreeRTOS/Include/portmacro.h"
+#endif
+
+#ifdef SDCC_CYGNAL
+    #include "../../Source/portable/SDCC/Cygnal/portmacro.h"
+#endif
+
+#ifdef GCC_ARM7
+    #include "../../Source/portable/GCC/ARM7_LPC2000/portmacro.h"
+#endif
+
+#ifdef GCC_ARM7_ECLIPSE
+    #include "portmacro.h"
+#endif
+
+#ifdef ROWLEY_LPC23xx
+    #include "../../Source/portable/GCC/ARM7_LPC23xx/portmacro.h"
+#endif
+
+#ifdef IAR_MSP430
+    #include "..\..\Source\portable\IAR\MSP430\portmacro.h"
+#endif
+
+#ifdef GCC_MSP430
+    #include "../../Source/portable/GCC/MSP430F449/portmacro.h"
+#endif
+
+#ifdef ROWLEY_MSP430
+    #include "../../Source/portable/Rowley/MSP430F449/portmacro.h"
+#endif
+
+#ifdef ARM7_LPC21xx_KEIL_RVDS
+    #include "..\..\Source\portable\RVDS\ARM7_LPC21xx\portmacro.h"
+#endif
+
+#ifdef SAM7_GCC
+    #include "../../Source/portable/GCC/ARM7_AT91SAM7S/portmacro.h"
+#endif
+
+#ifdef SAM7_IAR
+    #include "..\..\Source\portable\IAR\AtmelSAM7S64\portmacro.h"
+#endif
+
+#ifdef SAM9XE_IAR
+    #include "..\..\Source\portable\IAR\AtmelSAM9XE\portmacro.h"
+#endif
+
+#ifdef LPC2000_IAR
+    #include "..\..\Source\portable\IAR\LPC2000\portmacro.h"
+#endif
+
+#ifdef STR71X_IAR
+    #include "..\..\Source\portable\IAR\STR71x\portmacro.h"
+#endif
+
+#ifdef STR75X_IAR
+    #include "..\..\Source\portable\IAR\STR75x\portmacro.h"
+#endif
+
+#ifdef STR75X_GCC
+    #include "..\..\Source\portable\GCC\STR75x\portmacro.h"
+#endif
+
+#ifdef STR91X_IAR
+    #include "..\..\Source\portable\IAR\STR91x\portmacro.h"
+#endif
+
+#ifdef GCC_H8S
+    #include "../../Source/portable/GCC/H8S2329/portmacro.h"
+#endif
+
+#ifdef GCC_AT91FR40008
+    #include "../../Source/portable/GCC/ARM7_AT91FR40008/portmacro.h"
+#endif
+
+#ifdef RVDS_ARMCM3_LM3S102
+    #include "../../Source/portable/RVDS/ARM_CM3/portmacro.h"
+#endif
+
+#ifdef GCC_ARMCM3_LM3S102
+    #include "../../Source/portable/GCC/ARM_CM3/portmacro.h"
+#endif
+
+#ifdef GCC_ARMCM3
+    #include "../../Source/portable/GCC/ARM_CM3/portmacro.h"
+#endif
+
+#ifdef IAR_ARM_CM3
+    #include "../../Source/portable/IAR/ARM_CM3/portmacro.h"
+#endif
+
+#ifdef IAR_ARMCM3_LM
+    #include "../../Source/portable/IAR/ARM_CM3/portmacro.h"
+#endif
+
+#ifdef HCS12_CODE_WARRIOR
+    #include "../../Source/portable/CodeWarrior/HCS12/portmacro.h"
+#endif
+
+#ifdef MICROBLAZE_GCC
+    #include "../../Source/portable/GCC/MicroBlaze/portmacro.h"
+#endif
+
+#ifdef TERN_EE
+    #include "..\..\Source\portable\Paradigm\Tern_EE\small\portmacro.h"
+#endif
+
+#ifdef GCC_HCS12
+    #include "../../Source/portable/GCC/HCS12/portmacro.h"
+#endif
+
+#ifdef GCC_MCF5235
+    #include "../../Source/portable/GCC/MCF5235/portmacro.h"
+#endif
+
+#ifdef COLDFIRE_V2_GCC
+    #include "../../../Source/portable/GCC/ColdFire_V2/portmacro.h"
+#endif
+
+#ifdef COLDFIRE_V2_CODEWARRIOR
+    #include "../../Source/portable/CodeWarrior/ColdFire_V2/portmacro.h"
+#endif
+
+#ifdef GCC_PPC405
+    #include "../../Source/portable/GCC/PPC405_Xilinx/portmacro.h"
+#endif
+
+#ifdef GCC_PPC440
+    #include "../../Source/portable/GCC/PPC440_Xilinx/portmacro.h"
+#endif
+
+#ifdef _16FX_SOFTUNE
+    #include "..\..\Source\portable\Softune\MB96340\portmacro.h"
+#endif
+
+#ifdef BCC_INDUSTRIAL_PC_PORT
+
+/* A short file name has to be used in place of the normal
+ * FreeRTOSConfig.h when using the Borland compiler. */
+    #include "frconfig.h"
+    #include "..\portable\BCC\16BitDOS\PC\prtmacro.h"
+    typedef void ( __interrupt __far * pxISR )();
+#endif
+
+#ifdef BCC_FLASH_LITE_186_PORT
+
+/* A short file name has to be used in place of the normal
+ * FreeRTOSConfig.h when using the Borland compiler. */
+    #include "frconfig.h"
+    #include "..\portable\BCC\16BitDOS\flsh186\prtmacro.h"
+    typedef void ( __interrupt __far * pxISR )();
+#endif
+
+#ifdef __GNUC__
+    #ifdef __AVR32_AVR32A__
+        #include "portmacro.h"
+    #endif
+#endif
+
+#ifdef __ICCAVR32__
+    #ifdef __CORE__
+        #if __CORE__ == __AVR32A__
+            #include "portmacro.h"
+        #endif
+    #endif
+#endif
+
+#ifdef __91467D
+    #include "portmacro.h"
+#endif
+
+#ifdef __96340
+    #include "portmacro.h"
+#endif
+
+
+#ifdef __IAR_V850ES_Fx3__
+    #include "../../Source/portable/IAR/V850ES/portmacro.h"
+#endif
+
+#ifdef __IAR_V850ES_Jx3__
+    #include "../../Source/portable/IAR/V850ES/portmacro.h"
+#endif
+
+#ifdef __IAR_V850ES_Jx3_L__
+    #include "../../Source/portable/IAR/V850ES/portmacro.h"
+#endif
+
+#ifdef __IAR_V850ES_Jx2__
+    #include "../../Source/portable/IAR/V850ES/portmacro.h"
+#endif
+
+#ifdef __IAR_V850ES_Hx2__
+    #include "../../Source/portable/IAR/V850ES/portmacro.h"
+#endif
+
+#ifdef __IAR_78K0R_Kx3__
+    #include "../../Source/portable/IAR/78K0R/portmacro.h"
+#endif
+
+#ifdef __IAR_78K0R_Kx3L__
+    #include "../../Source/portable/IAR/78K0R/portmacro.h"
+#endif
+
+#endif /* DEPRECATED_DEFINITIONS_H */

freertos/Source/include/event_groups.h

@@ -0,0 +1,777 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef EVENT_GROUPS_H
+#define EVENT_GROUPS_H
+
+#ifndef INC_FREERTOS_H
+    #error "include FreeRTOS.h" must appear in source files before "include event_groups.h"
+#endif
+
+/* FreeRTOS includes. */
+#include "timers.h"
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+    extern "C" {
+#endif
+/* *INDENT-ON* */
+
+/**
+ * An event group is a collection of bits to which an application can assign a
+ * meaning.  For example, an application may create an event group to convey
+ * the status of various CAN bus related events in which bit 0 might mean "A CAN
+ * message has been received and is ready for processing", bit 1 might mean "The
+ * application has queued a message that is ready for sending onto the CAN
+ * network", and bit 2 might mean "It is time to send a SYNC message onto the
+ * CAN network" etc.  A task can then test the bit values to see which events
+ * are active, and optionally enter the Blocked state to wait for a specified
+ * bit or a group of specified bits to be active.  To continue the CAN bus
+ * example, a CAN controlling task can enter the Blocked state (and therefore
+ * not consume any processing time) until either bit 0, bit 1 or bit 2 are
+ * active, at which time the bit that was actually active would inform the task
+ * which action it had to take (process a received message, send a message, or
+ * send a SYNC).
+ *
+ * The event groups implementation contains intelligence to avoid race
+ * conditions that would otherwise occur were an application to use a simple
+ * variable for the same purpose.  This is particularly important with respect
+ * to when a bit within an event group is to be cleared, and when bits have to
+ * be set and then tested atomically - as is the case where event groups are
+ * used to create a synchronisation point between multiple tasks (a
+ * 'rendezvous').
+ *
+ * \defgroup EventGroup
+ */
+
+
+
+/**
+ * event_groups.h
+ *
+ * Type by which event groups are referenced.  For example, a call to
+ * xEventGroupCreate() returns an EventGroupHandle_t variable that can then
+ * be used as a parameter to other event group functions.
+ *
+ * \defgroup EventGroupHandle_t EventGroupHandle_t
+ * \ingroup EventGroup
+ */
+struct EventGroupDef_t;
+typedef struct EventGroupDef_t   * EventGroupHandle_t;
+
+/*
+ * The type that holds event bits always matches TickType_t - therefore the
+ * number of bits it holds is set by configUSE_16_BIT_TICKS (16 bits if set to 1,
+ * 32 bits if set to 0.
+ *
+ * \defgroup EventBits_t EventBits_t
+ * \ingroup EventGroup
+ */
+typedef TickType_t               EventBits_t;
+
+/**
+ * event_groups.h
+ * @code{c}
+ * EventGroupHandle_t xEventGroupCreate( void );
+ * @endcode
+ *
+ * Create a new event group.
+ *
+ * Internally, within the FreeRTOS implementation, event groups use a [small]
+ * block of memory, in which the event group's structure is stored.  If an event
+ * groups is created using xEventGroupCreate() then the required memory is
+ * automatically dynamically allocated inside the xEventGroupCreate() function.
+ * (see https://www.FreeRTOS.org/a00111.html).  If an event group is created
+ * using xEventGroupCreateStatic() then the application writer must instead
+ * provide the memory that will get used by the event group.
+ * xEventGroupCreateStatic() therefore allows an event group to be created
+ * without using any dynamic memory allocation.
+ *
+ * Although event groups are not related to ticks, for internal implementation
+ * reasons the number of bits available for use in an event group is dependent
+ * on the configUSE_16_BIT_TICKS setting in FreeRTOSConfig.h.  If
+ * configUSE_16_BIT_TICKS is 1 then each event group contains 8 usable bits (bit
+ * 0 to bit 7).  If configUSE_16_BIT_TICKS is set to 0 then each event group has
+ * 24 usable bits (bit 0 to bit 23).  The EventBits_t type is used to store
+ * event bits within an event group.
+ *
+ * @return If the event group was created then a handle to the event group is
+ * returned.  If there was insufficient FreeRTOS heap available to create the
+ * event group then NULL is returned.  See https://www.FreeRTOS.org/a00111.html
+ *
+ * Example usage:
+ * @code{c}
+ *  // Declare a variable to hold the created event group.
+ *  EventGroupHandle_t xCreatedEventGroup;
+ *
+ *  // Attempt to create the event group.
+ *  xCreatedEventGroup = xEventGroupCreate();
+ *
+ *  // Was the event group created successfully?
+ *  if( xCreatedEventGroup == NULL )
+ *  {
+ *      // The event group was not created because there was insufficient
+ *      // FreeRTOS heap available.
+ *  }
+ *  else
+ *  {
+ *      // The event group was created.
+ *  }
+ * @endcode
+ * \defgroup xEventGroupCreate xEventGroupCreate
+ * \ingroup EventGroup
+ */
+#if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 )
+    EventGroupHandle_t xEventGroupCreate( void ) PRIVILEGED_FUNCTION;
+#endif
+
+/**
+ * event_groups.h
+ * @code{c}
+ * EventGroupHandle_t xEventGroupCreateStatic( EventGroupHandle_t * pxEventGroupBuffer );
+ * @endcode
+ *
+ * Create a new event group.
+ *
+ * Internally, within the FreeRTOS implementation, event groups use a [small]
+ * block of memory, in which the event group's structure is stored.  If an event
+ * groups is created using xEventGroupCreate() then the required memory is
+ * automatically dynamically allocated inside the xEventGroupCreate() function.
+ * (see https://www.FreeRTOS.org/a00111.html).  If an event group is created
+ * using xEventGroupCreateStatic() then the application writer must instead
+ * provide the memory that will get used by the event group.
+ * xEventGroupCreateStatic() therefore allows an event group to be created
+ * without using any dynamic memory allocation.
+ *
+ * Although event groups are not related to ticks, for internal implementation
+ * reasons the number of bits available for use in an event group is dependent
+ * on the configUSE_16_BIT_TICKS setting in FreeRTOSConfig.h.  If
+ * configUSE_16_BIT_TICKS is 1 then each event group contains 8 usable bits (bit
+ * 0 to bit 7).  If configUSE_16_BIT_TICKS is set to 0 then each event group has
+ * 24 usable bits (bit 0 to bit 23).  The EventBits_t type is used to store
+ * event bits within an event group.
+ *
+ * @param pxEventGroupBuffer pxEventGroupBuffer must point to a variable of type
+ * StaticEventGroup_t, which will be then be used to hold the event group's data
+ * structures, removing the need for the memory to be allocated dynamically.
+ *
+ * @return If the event group was created then a handle to the event group is
+ * returned.  If pxEventGroupBuffer was NULL then NULL is returned.
+ *
+ * Example usage:
+ * @code{c}
+ *  // StaticEventGroup_t is a publicly accessible structure that has the same
+ *  // size and alignment requirements as the real event group structure.  It is
+ *  // provided as a mechanism for applications to know the size of the event
+ *  // group (which is dependent on the architecture and configuration file
+ *  // settings) without breaking the strict data hiding policy by exposing the
+ *  // real event group internals.  This StaticEventGroup_t variable is passed
+ *  // into the xSemaphoreCreateEventGroupStatic() function and is used to store
+ *  // the event group's data structures
+ *  StaticEventGroup_t xEventGroupBuffer;
+ *
+ *  // Create the event group without dynamically allocating any memory.
+ *  xEventGroup = xEventGroupCreateStatic( &xEventGroupBuffer );
+ * @endcode
+ */
+#if ( configSUPPORT_STATIC_ALLOCATION == 1 )
+    EventGroupHandle_t xEventGroupCreateStatic( StaticEventGroup_t * pxEventGroupBuffer ) PRIVILEGED_FUNCTION;
+#endif
+
+/**
+ * event_groups.h
+ * @code{c}
+ *  EventBits_t xEventGroupWaitBits(    EventGroupHandle_t xEventGroup,
+ *                                      const EventBits_t uxBitsToWaitFor,
+ *                                      const BaseType_t xClearOnExit,
+ *                                      const BaseType_t xWaitForAllBits,
+ *                                      const TickType_t xTicksToWait );
+ * @endcode
+ *
+ * [Potentially] block to wait for one or more bits to be set within a
+ * previously created event group.
+ *
+ * This function cannot be called from an interrupt.
+ *
+ * @param xEventGroup The event group in which the bits are being tested.  The
+ * event group must have previously been created using a call to
+ * xEventGroupCreate().
+ *
+ * @param uxBitsToWaitFor A bitwise value that indicates the bit or bits to test
+ * inside the event group.  For example, to wait for bit 0 and/or bit 2 set
+ * uxBitsToWaitFor to 0x05.  To wait for bits 0 and/or bit 1 and/or bit 2 set
+ * uxBitsToWaitFor to 0x07.  Etc.
+ *
+ * @param xClearOnExit If xClearOnExit is set to pdTRUE then any bits within
+ * uxBitsToWaitFor that are set within the event group will be cleared before
+ * xEventGroupWaitBits() returns if the wait condition was met (if the function
+ * returns for a reason other than a timeout).  If xClearOnExit is set to
+ * pdFALSE then the bits set in the event group are not altered when the call to
+ * xEventGroupWaitBits() returns.
+ *
+ * @param xWaitForAllBits If xWaitForAllBits is set to pdTRUE then
+ * xEventGroupWaitBits() will return when either all the bits in uxBitsToWaitFor
+ * are set or the specified block time expires.  If xWaitForAllBits is set to
+ * pdFALSE then xEventGroupWaitBits() will return when any one of the bits set
+ * in uxBitsToWaitFor is set or the specified block time expires.  The block
+ * time is specified by the xTicksToWait parameter.
+ *
+ * @param xTicksToWait The maximum amount of time (specified in 'ticks') to wait
+ * for one/all (depending on the xWaitForAllBits value) of the bits specified by
+ * uxBitsToWaitFor to become set.
+ *
+ * @return The value of the event group at the time either the bits being waited
+ * for became set, or the block time expired.  Test the return value to know
+ * which bits were set.  If xEventGroupWaitBits() returned because its timeout
+ * expired then not all the bits being waited for will be set.  If
+ * xEventGroupWaitBits() returned because the bits it was waiting for were set
+ * then the returned value is the event group value before any bits were
+ * automatically cleared in the case that xClearOnExit parameter was set to
+ * pdTRUE.
+ *
+ * Example usage:
+ * @code{c}
+ * #define BIT_0 ( 1 << 0 )
+ * #define BIT_4 ( 1 << 4 )
+ *
+ * void aFunction( EventGroupHandle_t xEventGroup )
+ * {
+ * EventBits_t uxBits;
+ * const TickType_t xTicksToWait = 100 / portTICK_PERIOD_MS;
+ *
+ *      // Wait a maximum of 100ms for either bit 0 or bit 4 to be set within
+ *      // the event group.  Clear the bits before exiting.
+ *      uxBits = xEventGroupWaitBits(
+ *                  xEventGroup,    // The event group being tested.
+ *                  BIT_0 | BIT_4,  // The bits within the event group to wait for.
+ *                  pdTRUE,         // BIT_0 and BIT_4 should be cleared before returning.
+ *                  pdFALSE,        // Don't wait for both bits, either bit will do.
+ *                  xTicksToWait ); // Wait a maximum of 100ms for either bit to be set.
+ *
+ *      if( ( uxBits & ( BIT_0 | BIT_4 ) ) == ( BIT_0 | BIT_4 ) )
+ *      {
+ *          // xEventGroupWaitBits() returned because both bits were set.
+ *      }
+ *      else if( ( uxBits & BIT_0 ) != 0 )
+ *      {
+ *          // xEventGroupWaitBits() returned because just BIT_0 was set.
+ *      }
+ *      else if( ( uxBits & BIT_4 ) != 0 )
+ *      {
+ *          // xEventGroupWaitBits() returned because just BIT_4 was set.
+ *      }
+ *      else
+ *      {
+ *          // xEventGroupWaitBits() returned because xTicksToWait ticks passed
+ *          // without either BIT_0 or BIT_4 becoming set.
+ *      }
+ * }
+ * @endcode
+ * \defgroup xEventGroupWaitBits xEventGroupWaitBits
+ * \ingroup EventGroup
+ */
+EventBits_t xEventGroupWaitBits( EventGroupHandle_t xEventGroup,
+                                 const EventBits_t uxBitsToWaitFor,
+                                 const BaseType_t xClearOnExit,
+                                 const BaseType_t xWaitForAllBits,
+                                 TickType_t xTicksToWait ) PRIVILEGED_FUNCTION;
+
+/**
+ * event_groups.h
+ * @code{c}
+ *  EventBits_t xEventGroupClearBits( EventGroupHandle_t xEventGroup, const EventBits_t uxBitsToClear );
+ * @endcode
+ *
+ * Clear bits within an event group.  This function cannot be called from an
+ * interrupt.
+ *
+ * @param xEventGroup The event group in which the bits are to be cleared.
+ *
+ * @param uxBitsToClear A bitwise value that indicates the bit or bits to clear
+ * in the event group.  For example, to clear bit 3 only, set uxBitsToClear to
+ * 0x08.  To clear bit 3 and bit 0 set uxBitsToClear to 0x09.
+ *
+ * @return The value of the event group before the specified bits were cleared.
+ *
+ * Example usage:
+ * @code{c}
+ * #define BIT_0 ( 1 << 0 )
+ * #define BIT_4 ( 1 << 4 )
+ *
+ * void aFunction( EventGroupHandle_t xEventGroup )
+ * {
+ * EventBits_t uxBits;
+ *
+ *      // Clear bit 0 and bit 4 in xEventGroup.
+ *      uxBits = xEventGroupClearBits(
+ *                              xEventGroup,    // The event group being updated.
+ *                              BIT_0 | BIT_4 );// The bits being cleared.
+ *
+ *      if( ( uxBits & ( BIT_0 | BIT_4 ) ) == ( BIT_0 | BIT_4 ) )
+ *      {
+ *          // Both bit 0 and bit 4 were set before xEventGroupClearBits() was
+ *          // called.  Both will now be clear (not set).
+ *      }
+ *      else if( ( uxBits & BIT_0 ) != 0 )
+ *      {
+ *          // Bit 0 was set before xEventGroupClearBits() was called.  It will
+ *          // now be clear.
+ *      }
+ *      else if( ( uxBits & BIT_4 ) != 0 )
+ *      {
+ *          // Bit 4 was set before xEventGroupClearBits() was called.  It will
+ *          // now be clear.
+ *      }
+ *      else
+ *      {
+ *          // Neither bit 0 nor bit 4 were set in the first place.
+ *      }
+ * }
+ * @endcode
+ * \defgroup xEventGroupClearBits xEventGroupClearBits
+ * \ingroup EventGroup
+ */
+EventBits_t xEventGroupClearBits( EventGroupHandle_t xEventGroup,
+                                  const EventBits_t uxBitsToClear ) PRIVILEGED_FUNCTION;
+
+/**
+ * event_groups.h
+ * @code{c}
+ *  BaseType_t xEventGroupClearBitsFromISR( EventGroupHandle_t xEventGroup, const EventBits_t uxBitsToSet );
+ * @endcode
+ *
+ * A version of xEventGroupClearBits() that can be called from an interrupt.
+ *
+ * Setting bits in an event group is not a deterministic operation because there
+ * are an unknown number of tasks that may be waiting for the bit or bits being
+ * set.  FreeRTOS does not allow nondeterministic operations to be performed
+ * while interrupts are disabled, so protects event groups that are accessed
+ * from tasks by suspending the scheduler rather than disabling interrupts.  As
+ * a result event groups cannot be accessed directly from an interrupt service
+ * routine.  Therefore xEventGroupClearBitsFromISR() sends a message to the
+ * timer task to have the clear operation performed in the context of the timer
+ * task.
+ *
+ * @param xEventGroup The event group in which the bits are to be cleared.
+ *
+ * @param uxBitsToClear A bitwise value that indicates the bit or bits to clear.
+ * For example, to clear bit 3 only, set uxBitsToClear to 0x08.  To clear bit 3
+ * and bit 0 set uxBitsToClear to 0x09.
+ *
+ * @return If the request to execute the function was posted successfully then
+ * pdPASS is returned, otherwise pdFALSE is returned.  pdFALSE will be returned
+ * if the timer service queue was full.
+ *
+ * Example usage:
+ * @code{c}
+ * #define BIT_0 ( 1 << 0 )
+ * #define BIT_4 ( 1 << 4 )
+ *
+ * // An event group which it is assumed has already been created by a call to
+ * // xEventGroupCreate().
+ * EventGroupHandle_t xEventGroup;
+ *
+ * void anInterruptHandler( void )
+ * {
+ *      // Clear bit 0 and bit 4 in xEventGroup.
+ *      xResult = xEventGroupClearBitsFromISR(
+ *                          xEventGroup,     // The event group being updated.
+ *                          BIT_0 | BIT_4 ); // The bits being set.
+ *
+ *      if( xResult == pdPASS )
+ *      {
+ *          // The message was posted successfully.
+ *      }
+ * }
+ * @endcode
+ * \defgroup xEventGroupClearBitsFromISR xEventGroupClearBitsFromISR
+ * \ingroup EventGroup
+ */
+#if ( configUSE_TRACE_FACILITY == 1 )
+    BaseType_t xEventGroupClearBitsFromISR( EventGroupHandle_t xEventGroup,
+                                            const EventBits_t uxBitsToClear ) PRIVILEGED_FUNCTION;
+#else
+    #define xEventGroupClearBitsFromISR( xEventGroup, uxBitsToClear ) \
+    xTimerPendFunctionCallFromISR( vEventGroupClearBitsCallback, ( void * ) xEventGroup, ( uint32_t ) uxBitsToClear, NULL )
+#endif
+
+/**
+ * event_groups.h
+ * @code{c}
+ *  EventBits_t xEventGroupSetBits( EventGroupHandle_t xEventGroup, const EventBits_t uxBitsToSet );
+ * @endcode
+ *
+ * Set bits within an event group.
+ * This function cannot be called from an interrupt.  xEventGroupSetBitsFromISR()
+ * is a version that can be called from an interrupt.
+ *
+ * Setting bits in an event group will automatically unblock tasks that are
+ * blocked waiting for the bits.
+ *
+ * @param xEventGroup The event group in which the bits are to be set.
+ *
+ * @param uxBitsToSet A bitwise value that indicates the bit or bits to set.
+ * For example, to set bit 3 only, set uxBitsToSet to 0x08.  To set bit 3
+ * and bit 0 set uxBitsToSet to 0x09.
+ *
+ * @return The value of the event group at the time the call to
+ * xEventGroupSetBits() returns.  There are two reasons why the returned value
+ * might have the bits specified by the uxBitsToSet parameter cleared.  First,
+ * if setting a bit results in a task that was waiting for the bit leaving the
+ * blocked state then it is possible the bit will be cleared automatically
+ * (see the xClearBitOnExit parameter of xEventGroupWaitBits()).  Second, any
+ * unblocked (or otherwise Ready state) task that has a priority above that of
+ * the task that called xEventGroupSetBits() will execute and may change the
+ * event group value before the call to xEventGroupSetBits() returns.
+ *
+ * Example usage:
+ * @code{c}
+ * #define BIT_0 ( 1 << 0 )
+ * #define BIT_4 ( 1 << 4 )
+ *
+ * void aFunction( EventGroupHandle_t xEventGroup )
+ * {
+ * EventBits_t uxBits;
+ *
+ *      // Set bit 0 and bit 4 in xEventGroup.
+ *      uxBits = xEventGroupSetBits(
+ *                          xEventGroup,    // The event group being updated.
+ *                          BIT_0 | BIT_4 );// The bits being set.
+ *
+ *      if( ( uxBits & ( BIT_0 | BIT_4 ) ) == ( BIT_0 | BIT_4 ) )
+ *      {
+ *          // Both bit 0 and bit 4 remained set when the function returned.
+ *      }
+ *      else if( ( uxBits & BIT_0 ) != 0 )
+ *      {
+ *          // Bit 0 remained set when the function returned, but bit 4 was
+ *          // cleared.  It might be that bit 4 was cleared automatically as a
+ *          // task that was waiting for bit 4 was removed from the Blocked
+ *          // state.
+ *      }
+ *      else if( ( uxBits & BIT_4 ) != 0 )
+ *      {
+ *          // Bit 4 remained set when the function returned, but bit 0 was
+ *          // cleared.  It might be that bit 0 was cleared automatically as a
+ *          // task that was waiting for bit 0 was removed from the Blocked
+ *          // state.
+ *      }
+ *      else
+ *      {
+ *          // Neither bit 0 nor bit 4 remained set.  It might be that a task
+ *          // was waiting for both of the bits to be set, and the bits were
+ *          // cleared as the task left the Blocked state.
+ *      }
+ * }
+ * @endcode
+ * \defgroup xEventGroupSetBits xEventGroupSetBits
+ * \ingroup EventGroup
+ */
+EventBits_t xEventGroupSetBits( EventGroupHandle_t xEventGroup,
+                                const EventBits_t uxBitsToSet ) PRIVILEGED_FUNCTION;
+
+/**
+ * event_groups.h
+ * @code{c}
+ *  BaseType_t xEventGroupSetBitsFromISR( EventGroupHandle_t xEventGroup, const EventBits_t uxBitsToSet, BaseType_t *pxHigherPriorityTaskWoken );
+ * @endcode
+ *
+ * A version of xEventGroupSetBits() that can be called from an interrupt.
+ *
+ * Setting bits in an event group is not a deterministic operation because there
+ * are an unknown number of tasks that may be waiting for the bit or bits being
+ * set.  FreeRTOS does not allow nondeterministic operations to be performed in
+ * interrupts or from critical sections.  Therefore xEventGroupSetBitsFromISR()
+ * sends a message to the timer task to have the set operation performed in the
+ * context of the timer task - where a scheduler lock is used in place of a
+ * critical section.
+ *
+ * @param xEventGroup The event group in which the bits are to be set.
+ *
+ * @param uxBitsToSet A bitwise value that indicates the bit or bits to set.
+ * For example, to set bit 3 only, set uxBitsToSet to 0x08.  To set bit 3
+ * and bit 0 set uxBitsToSet to 0x09.
+ *
+ * @param pxHigherPriorityTaskWoken As mentioned above, calling this function
+ * will result in a message being sent to the timer daemon task.  If the
+ * priority of the timer daemon task is higher than the priority of the
+ * currently running task (the task the interrupt interrupted) then
+ * *pxHigherPriorityTaskWoken will be set to pdTRUE by
+ * xEventGroupSetBitsFromISR(), indicating that a context switch should be
+ * requested before the interrupt exits.  For that reason
+ * *pxHigherPriorityTaskWoken must be initialised to pdFALSE.  See the
+ * example code below.
+ *
+ * @return If the request to execute the function was posted successfully then
+ * pdPASS is returned, otherwise pdFALSE is returned.  pdFALSE will be returned
+ * if the timer service queue was full.
+ *
+ * Example usage:
+ * @code{c}
+ * #define BIT_0 ( 1 << 0 )
+ * #define BIT_4 ( 1 << 4 )
+ *
+ * // An event group which it is assumed has already been created by a call to
+ * // xEventGroupCreate().
+ * EventGroupHandle_t xEventGroup;
+ *
+ * void anInterruptHandler( void )
+ * {
+ * BaseType_t xHigherPriorityTaskWoken, xResult;
+ *
+ *      // xHigherPriorityTaskWoken must be initialised to pdFALSE.
+ *      xHigherPriorityTaskWoken = pdFALSE;
+ *
+ *      // Set bit 0 and bit 4 in xEventGroup.
+ *      xResult = xEventGroupSetBitsFromISR(
+ *                          xEventGroup,    // The event group being updated.
+ *                          BIT_0 | BIT_4   // The bits being set.
+ *                          &xHigherPriorityTaskWoken );
+ *
+ *      // Was the message posted successfully?
+ *      if( xResult == pdPASS )
+ *      {
+ *          // If xHigherPriorityTaskWoken is now set to pdTRUE then a context
+ *          // switch should be requested.  The macro used is port specific and
+ *          // will be either portYIELD_FROM_ISR() or portEND_SWITCHING_ISR() -
+ *          // refer to the documentation page for the port being used.
+ *          portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
+ *      }
+ * }
+ * @endcode
+ * \defgroup xEventGroupSetBitsFromISR xEventGroupSetBitsFromISR
+ * \ingroup EventGroup
+ */
+#if ( configUSE_TRACE_FACILITY == 1 )
+    BaseType_t xEventGroupSetBitsFromISR( EventGroupHandle_t xEventGroup,
+                                          const EventBits_t uxBitsToSet,
+                                          BaseType_t * pxHigherPriorityTaskWoken ) PRIVILEGED_FUNCTION;
+#else
+    #define xEventGroupSetBitsFromISR( xEventGroup, uxBitsToSet, pxHigherPriorityTaskWoken ) \
+    xTimerPendFunctionCallFromISR( vEventGroupSetBitsCallback, ( void * ) xEventGroup, ( uint32_t ) uxBitsToSet, pxHigherPriorityTaskWoken )
+#endif
+
+/**
+ * event_groups.h
+ * @code{c}
+ *  EventBits_t xEventGroupSync(    EventGroupHandle_t xEventGroup,
+ *                                  const EventBits_t uxBitsToSet,
+ *                                  const EventBits_t uxBitsToWaitFor,
+ *                                  TickType_t xTicksToWait );
+ * @endcode
+ *
+ * Atomically set bits within an event group, then wait for a combination of
+ * bits to be set within the same event group.  This functionality is typically
+ * used to synchronise multiple tasks, where each task has to wait for the other
+ * tasks to reach a synchronisation point before proceeding.
+ *
+ * This function cannot be used from an interrupt.
+ *
+ * The function will return before its block time expires if the bits specified
+ * by the uxBitsToWait parameter are set, or become set within that time.  In
+ * this case all the bits specified by uxBitsToWait will be automatically
+ * cleared before the function returns.
+ *
+ * @param xEventGroup The event group in which the bits are being tested.  The
+ * event group must have previously been created using a call to
+ * xEventGroupCreate().
+ *
+ * @param uxBitsToSet The bits to set in the event group before determining
+ * if, and possibly waiting for, all the bits specified by the uxBitsToWait
+ * parameter are set.
+ *
+ * @param uxBitsToWaitFor A bitwise value that indicates the bit or bits to test
+ * inside the event group.  For example, to wait for bit 0 and bit 2 set
+ * uxBitsToWaitFor to 0x05.  To wait for bits 0 and bit 1 and bit 2 set
+ * uxBitsToWaitFor to 0x07.  Etc.
+ *
+ * @param xTicksToWait The maximum amount of time (specified in 'ticks') to wait
+ * for all of the bits specified by uxBitsToWaitFor to become set.
+ *
+ * @return The value of the event group at the time either the bits being waited
+ * for became set, or the block time expired.  Test the return value to know
+ * which bits were set.  If xEventGroupSync() returned because its timeout
+ * expired then not all the bits being waited for will be set.  If
+ * xEventGroupSync() returned because all the bits it was waiting for were
+ * set then the returned value is the event group value before any bits were
+ * automatically cleared.
+ *
+ * Example usage:
+ * @code{c}
+ * // Bits used by the three tasks.
+ * #define TASK_0_BIT     ( 1 << 0 )
+ * #define TASK_1_BIT     ( 1 << 1 )
+ * #define TASK_2_BIT     ( 1 << 2 )
+ *
+ * #define ALL_SYNC_BITS ( TASK_0_BIT | TASK_1_BIT | TASK_2_BIT )
+ *
+ * // Use an event group to synchronise three tasks.  It is assumed this event
+ * // group has already been created elsewhere.
+ * EventGroupHandle_t xEventBits;
+ *
+ * void vTask0( void *pvParameters )
+ * {
+ * EventBits_t uxReturn;
+ * TickType_t xTicksToWait = 100 / portTICK_PERIOD_MS;
+ *
+ *   for( ;; )
+ *   {
+ *      // Perform task functionality here.
+ *
+ *      // Set bit 0 in the event flag to note this task has reached the
+ *      // sync point.  The other two tasks will set the other two bits defined
+ *      // by ALL_SYNC_BITS.  All three tasks have reached the synchronisation
+ *      // point when all the ALL_SYNC_BITS are set.  Wait a maximum of 100ms
+ *      // for this to happen.
+ *      uxReturn = xEventGroupSync( xEventBits, TASK_0_BIT, ALL_SYNC_BITS, xTicksToWait );
+ *
+ *      if( ( uxReturn & ALL_SYNC_BITS ) == ALL_SYNC_BITS )
+ *      {
+ *          // All three tasks reached the synchronisation point before the call
+ *          // to xEventGroupSync() timed out.
+ *      }
+ *  }
+ * }
+ *
+ * void vTask1( void *pvParameters )
+ * {
+ *   for( ;; )
+ *   {
+ *      // Perform task functionality here.
+ *
+ *      // Set bit 1 in the event flag to note this task has reached the
+ *      // synchronisation point.  The other two tasks will set the other two
+ *      // bits defined by ALL_SYNC_BITS.  All three tasks have reached the
+ *      // synchronisation point when all the ALL_SYNC_BITS are set.  Wait
+ *      // indefinitely for this to happen.
+ *      xEventGroupSync( xEventBits, TASK_1_BIT, ALL_SYNC_BITS, portMAX_DELAY );
+ *
+ *      // xEventGroupSync() was called with an indefinite block time, so
+ *      // this task will only reach here if the synchronisation was made by all
+ *      // three tasks, so there is no need to test the return value.
+ *   }
+ * }
+ *
+ * void vTask2( void *pvParameters )
+ * {
+ *   for( ;; )
+ *   {
+ *      // Perform task functionality here.
+ *
+ *      // Set bit 2 in the event flag to note this task has reached the
+ *      // synchronisation point.  The other two tasks will set the other two
+ *      // bits defined by ALL_SYNC_BITS.  All three tasks have reached the
+ *      // synchronisation point when all the ALL_SYNC_BITS are set.  Wait
+ *      // indefinitely for this to happen.
+ *      xEventGroupSync( xEventBits, TASK_2_BIT, ALL_SYNC_BITS, portMAX_DELAY );
+ *
+ *      // xEventGroupSync() was called with an indefinite block time, so
+ *      // this task will only reach here if the synchronisation was made by all
+ *      // three tasks, so there is no need to test the return value.
+ *  }
+ * }
+ *
+ * @endcode
+ * \defgroup xEventGroupSync xEventGroupSync
+ * \ingroup EventGroup
+ */
+EventBits_t xEventGroupSync( EventGroupHandle_t xEventGroup,
+                             const EventBits_t uxBitsToSet,
+                             const EventBits_t uxBitsToWaitFor,
+                             TickType_t xTicksToWait ) PRIVILEGED_FUNCTION;
+
+
+/**
+ * event_groups.h
+ * @code{c}
+ *  EventBits_t xEventGroupGetBits( EventGroupHandle_t xEventGroup );
+ * @endcode
+ *
+ * Returns the current value of the bits in an event group.  This function
+ * cannot be used from an interrupt.
+ *
+ * @param xEventGroup The event group being queried.
+ *
+ * @return The event group bits at the time xEventGroupGetBits() was called.
+ *
+ * \defgroup xEventGroupGetBits xEventGroupGetBits
+ * \ingroup EventGroup
+ */
+#define xEventGroupGetBits( xEventGroup )    xEventGroupClearBits( xEventGroup, 0 )
+
+/**
+ * event_groups.h
+ * @code{c}
+ *  EventBits_t xEventGroupGetBitsFromISR( EventGroupHandle_t xEventGroup );
+ * @endcode
+ *
+ * A version of xEventGroupGetBits() that can be called from an ISR.
+ *
+ * @param xEventGroup The event group being queried.
+ *
+ * @return The event group bits at the time xEventGroupGetBitsFromISR() was called.
+ *
+ * \defgroup xEventGroupGetBitsFromISR xEventGroupGetBitsFromISR
+ * \ingroup EventGroup
+ */
+EventBits_t xEventGroupGetBitsFromISR( EventGroupHandle_t xEventGroup ) PRIVILEGED_FUNCTION;
+
+/**
+ * event_groups.h
+ * @code{c}
+ *  void xEventGroupDelete( EventGroupHandle_t xEventGroup );
+ * @endcode
+ *
+ * Delete an event group that was previously created by a call to
+ * xEventGroupCreate().  Tasks that are blocked on the event group will be
+ * unblocked and obtain 0 as the event group's value.
+ *
+ * @param xEventGroup The event group being deleted.
+ */
+void vEventGroupDelete( EventGroupHandle_t xEventGroup ) PRIVILEGED_FUNCTION;
+
+/* For internal use only. */
+void vEventGroupSetBitsCallback( void * pvEventGroup,
+                                 const uint32_t ulBitsToSet ) PRIVILEGED_FUNCTION;
+void vEventGroupClearBitsCallback( void * pvEventGroup,
+                                   const uint32_t ulBitsToClear ) PRIVILEGED_FUNCTION;
+
+
+#if ( configUSE_TRACE_FACILITY == 1 )
+    UBaseType_t uxEventGroupGetNumber( void * xEventGroup ) PRIVILEGED_FUNCTION;
+    void vEventGroupSetNumber( void * xEventGroup,
+                               UBaseType_t uxEventGroupNumber ) PRIVILEGED_FUNCTION;
+#endif
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+    }
+#endif
+/* *INDENT-ON* */
+
+#endif /* EVENT_GROUPS_H */

freertos/Source/include/list.h

@@ -0,0 +1,499 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+/*
+ * This is the list implementation used by the scheduler.  While it is tailored
+ * heavily for the schedulers needs, it is also available for use by
+ * application code.
+ *
+ * list_ts can only store pointers to list_item_ts.  Each ListItem_t contains a
+ * numeric value (xItemValue).  Most of the time the lists are sorted in
+ * ascending item value order.
+ *
+ * Lists are created already containing one list item.  The value of this
+ * item is the maximum possible that can be stored, it is therefore always at
+ * the end of the list and acts as a marker.  The list member pxHead always
+ * points to this marker - even though it is at the tail of the list.  This
+ * is because the tail contains a wrap back pointer to the true head of
+ * the list.
+ *
+ * In addition to it's value, each list item contains a pointer to the next
+ * item in the list (pxNext), a pointer to the list it is in (pxContainer)
+ * and a pointer to back to the object that contains it.  These later two
+ * pointers are included for efficiency of list manipulation.  There is
+ * effectively a two way link between the object containing the list item and
+ * the list item itself.
+ *
+ *
+ * \page ListIntroduction List Implementation
+ * \ingroup FreeRTOSIntro
+ */
+
+
+#ifndef LIST_H
+#define LIST_H
+
+#ifndef INC_FREERTOS_H
+    #error "FreeRTOS.h must be included before list.h"
+#endif
+
+/*
+ * The list structure members are modified from within interrupts, and therefore
+ * by rights should be declared volatile.  However, they are only modified in a
+ * functionally atomic way (within critical sections of with the scheduler
+ * suspended) and are either passed by reference into a function or indexed via
+ * a volatile variable.  Therefore, in all use cases tested so far, the volatile
+ * qualifier can be omitted in order to provide a moderate performance
+ * improvement without adversely affecting functional behaviour.  The assembly
+ * instructions generated by the IAR, ARM and GCC compilers when the respective
+ * compiler's options were set for maximum optimisation has been inspected and
+ * deemed to be as intended.  That said, as compiler technology advances, and
+ * especially if aggressive cross module optimisation is used (a use case that
+ * has not been exercised to any great extend) then it is feasible that the
+ * volatile qualifier will be needed for correct optimisation.  It is expected
+ * that a compiler removing essential code because, without the volatile
+ * qualifier on the list structure members and with aggressive cross module
+ * optimisation, the compiler deemed the code unnecessary will result in
+ * complete and obvious failure of the scheduler.  If this is ever experienced
+ * then the volatile qualifier can be inserted in the relevant places within the
+ * list structures by simply defining configLIST_VOLATILE to volatile in
+ * FreeRTOSConfig.h (as per the example at the bottom of this comment block).
+ * If configLIST_VOLATILE is not defined then the preprocessor directives below
+ * will simply #define configLIST_VOLATILE away completely.
+ *
+ * To use volatile list structure members then add the following line to
+ * FreeRTOSConfig.h (without the quotes):
+ * "#define configLIST_VOLATILE volatile"
+ */
+#ifndef configLIST_VOLATILE
+    #define configLIST_VOLATILE
+#endif /* configSUPPORT_CROSS_MODULE_OPTIMISATION */
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+    extern "C" {
+#endif
+/* *INDENT-ON* */
+
+/* Macros that can be used to place known values within the list structures,
+ * then check that the known values do not get corrupted during the execution of
+ * the application.   These may catch the list data structures being overwritten in
+ * memory.  They will not catch data errors caused by incorrect configuration or
+ * use of FreeRTOS.*/
+#if ( configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES == 0 )
+    /* Define the macros to do nothing. */
+    #define listFIRST_LIST_ITEM_INTEGRITY_CHECK_VALUE
+    #define listSECOND_LIST_ITEM_INTEGRITY_CHECK_VALUE
+    #define listFIRST_LIST_INTEGRITY_CHECK_VALUE
+    #define listSECOND_LIST_INTEGRITY_CHECK_VALUE
+    #define listSET_FIRST_LIST_ITEM_INTEGRITY_CHECK_VALUE( pxItem )
+    #define listSET_SECOND_LIST_ITEM_INTEGRITY_CHECK_VALUE( pxItem )
+    #define listSET_LIST_INTEGRITY_CHECK_1_VALUE( pxList )
+    #define listSET_LIST_INTEGRITY_CHECK_2_VALUE( pxList )
+    #define listTEST_LIST_ITEM_INTEGRITY( pxItem )
+    #define listTEST_LIST_INTEGRITY( pxList )
+#else /* if ( configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES == 0 ) */
+    /* Define macros that add new members into the list structures. */
+    #define listFIRST_LIST_ITEM_INTEGRITY_CHECK_VALUE     TickType_t xListItemIntegrityValue1;
+    #define listSECOND_LIST_ITEM_INTEGRITY_CHECK_VALUE    TickType_t xListItemIntegrityValue2;
+    #define listFIRST_LIST_INTEGRITY_CHECK_VALUE          TickType_t xListIntegrityValue1;
+    #define listSECOND_LIST_INTEGRITY_CHECK_VALUE         TickType_t xListIntegrityValue2;
+
+/* Define macros that set the new structure members to known values. */
+    #define listSET_FIRST_LIST_ITEM_INTEGRITY_CHECK_VALUE( pxItem )     ( pxItem )->xListItemIntegrityValue1 = pdINTEGRITY_CHECK_VALUE
+    #define listSET_SECOND_LIST_ITEM_INTEGRITY_CHECK_VALUE( pxItem )    ( pxItem )->xListItemIntegrityValue2 = pdINTEGRITY_CHECK_VALUE
+    #define listSET_LIST_INTEGRITY_CHECK_1_VALUE( pxList )              ( pxList )->xListIntegrityValue1 = pdINTEGRITY_CHECK_VALUE
+    #define listSET_LIST_INTEGRITY_CHECK_2_VALUE( pxList )              ( pxList )->xListIntegrityValue2 = pdINTEGRITY_CHECK_VALUE
+
+/* Define macros that will assert if one of the structure members does not
+ * contain its expected value. */
+    #define listTEST_LIST_ITEM_INTEGRITY( pxItem )                      configASSERT( ( ( pxItem )->xListItemIntegrityValue1 == pdINTEGRITY_CHECK_VALUE ) && ( ( pxItem )->xListItemIntegrityValue2 == pdINTEGRITY_CHECK_VALUE ) )
+    #define listTEST_LIST_INTEGRITY( pxList )                           configASSERT( ( ( pxList )->xListIntegrityValue1 == pdINTEGRITY_CHECK_VALUE ) && ( ( pxList )->xListIntegrityValue2 == pdINTEGRITY_CHECK_VALUE ) )
+#endif /* configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES */
+
+
+/*
+ * Definition of the only type of object that a list can contain.
+ */
+struct xLIST;
+struct xLIST_ITEM
+{
+    listFIRST_LIST_ITEM_INTEGRITY_CHECK_VALUE           /*< Set to a known value if configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES is set to 1. */
+    configLIST_VOLATILE TickType_t xItemValue;          /*< The value being listed.  In most cases this is used to sort the list in ascending order. */
+    struct xLIST_ITEM * configLIST_VOLATILE pxNext;     /*< Pointer to the next ListItem_t in the list. */
+    struct xLIST_ITEM * configLIST_VOLATILE pxPrevious; /*< Pointer to the previous ListItem_t in the list. */
+    void * pvOwner;                                     /*< Pointer to the object (normally a TCB) that contains the list item.  There is therefore a two way link between the object containing the list item and the list item itself. */
+    struct xLIST * configLIST_VOLATILE pxContainer;     /*< Pointer to the list in which this list item is placed (if any). */
+    listSECOND_LIST_ITEM_INTEGRITY_CHECK_VALUE          /*< Set to a known value if configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES is set to 1. */
+};
+typedef struct xLIST_ITEM ListItem_t;                   /* For some reason lint wants this as two separate definitions. */
+
+struct xMINI_LIST_ITEM
+{
+    listFIRST_LIST_ITEM_INTEGRITY_CHECK_VALUE /*< Set to a known value if configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES is set to 1. */
+    configLIST_VOLATILE TickType_t xItemValue;
+    struct xLIST_ITEM * configLIST_VOLATILE pxNext;
+    struct xLIST_ITEM * configLIST_VOLATILE pxPrevious;
+};
+typedef struct xMINI_LIST_ITEM MiniListItem_t;
+
+/*
+ * Definition of the type of queue used by the scheduler.
+ */
+typedef struct xLIST
+{
+    listFIRST_LIST_INTEGRITY_CHECK_VALUE      /*< Set to a known value if configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES is set to 1. */
+    volatile UBaseType_t uxNumberOfItems;
+    ListItem_t * configLIST_VOLATILE pxIndex; /*< Used to walk through the list.  Points to the last item returned by a call to listGET_OWNER_OF_NEXT_ENTRY (). */
+    MiniListItem_t xListEnd;                  /*< List item that contains the maximum possible item value meaning it is always at the end of the list and is therefore used as a marker. */
+    listSECOND_LIST_INTEGRITY_CHECK_VALUE     /*< Set to a known value if configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES is set to 1. */
+} List_t;
+
+/*
+ * Access macro to set the owner of a list item.  The owner of a list item
+ * is the object (usually a TCB) that contains the list item.
+ *
+ * \page listSET_LIST_ITEM_OWNER listSET_LIST_ITEM_OWNER
+ * \ingroup LinkedList
+ */
+#define listSET_LIST_ITEM_OWNER( pxListItem, pxOwner )    ( ( pxListItem )->pvOwner = ( void * ) ( pxOwner ) )
+
+/*
+ * Access macro to get the owner of a list item.  The owner of a list item
+ * is the object (usually a TCB) that contains the list item.
+ *
+ * \page listGET_LIST_ITEM_OWNER listSET_LIST_ITEM_OWNER
+ * \ingroup LinkedList
+ */
+#define listGET_LIST_ITEM_OWNER( pxListItem )             ( ( pxListItem )->pvOwner )
+
+/*
+ * Access macro to set the value of the list item.  In most cases the value is
+ * used to sort the list in ascending order.
+ *
+ * \page listSET_LIST_ITEM_VALUE listSET_LIST_ITEM_VALUE
+ * \ingroup LinkedList
+ */
+#define listSET_LIST_ITEM_VALUE( pxListItem, xValue )     ( ( pxListItem )->xItemValue = ( xValue ) )
+
+/*
+ * Access macro to retrieve the value of the list item.  The value can
+ * represent anything - for example the priority of a task, or the time at
+ * which a task should be unblocked.
+ *
+ * \page listGET_LIST_ITEM_VALUE listGET_LIST_ITEM_VALUE
+ * \ingroup LinkedList
+ */
+#define listGET_LIST_ITEM_VALUE( pxListItem )             ( ( pxListItem )->xItemValue )
+
+/*
+ * Access macro to retrieve the value of the list item at the head of a given
+ * list.
+ *
+ * \page listGET_LIST_ITEM_VALUE listGET_LIST_ITEM_VALUE
+ * \ingroup LinkedList
+ */
+#define listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxList )        ( ( ( pxList )->xListEnd ).pxNext->xItemValue )
+
+/*
+ * Return the list item at the head of the list.
+ *
+ * \page listGET_HEAD_ENTRY listGET_HEAD_ENTRY
+ * \ingroup LinkedList
+ */
+#define listGET_HEAD_ENTRY( pxList )                      ( ( ( pxList )->xListEnd ).pxNext )
+
+/*
+ * Return the next list item.
+ *
+ * \page listGET_NEXT listGET_NEXT
+ * \ingroup LinkedList
+ */
+#define listGET_NEXT( pxListItem )                        ( ( pxListItem )->pxNext )
+
+/*
+ * Return the list item that marks the end of the list
+ *
+ * \page listGET_END_MARKER listGET_END_MARKER
+ * \ingroup LinkedList
+ */
+#define listGET_END_MARKER( pxList )                      ( ( ListItem_t const * ) ( &( ( pxList )->xListEnd ) ) )
+
+/*
+ * Access macro to determine if a list contains any items.  The macro will
+ * only have the value true if the list is empty.
+ *
+ * \page listLIST_IS_EMPTY listLIST_IS_EMPTY
+ * \ingroup LinkedList
+ */
+#define listLIST_IS_EMPTY( pxList )                       ( ( ( pxList )->uxNumberOfItems == ( UBaseType_t ) 0 ) ? pdTRUE : pdFALSE )
+
+/*
+ * Access macro to return the number of items in the list.
+ */
+#define listCURRENT_LIST_LENGTH( pxList )                 ( ( pxList )->uxNumberOfItems )
+
+/*
+ * Access function to obtain the owner of the next entry in a list.
+ *
+ * The list member pxIndex is used to walk through a list.  Calling
+ * listGET_OWNER_OF_NEXT_ENTRY increments pxIndex to the next item in the list
+ * and returns that entry's pxOwner parameter.  Using multiple calls to this
+ * function it is therefore possible to move through every item contained in
+ * a list.
+ *
+ * The pxOwner parameter of a list item is a pointer to the object that owns
+ * the list item.  In the scheduler this is normally a task control block.
+ * The pxOwner parameter effectively creates a two way link between the list
+ * item and its owner.
+ *
+ * @param pxTCB pxTCB is set to the address of the owner of the next list item.
+ * @param pxList The list from which the next item owner is to be returned.
+ *
+ * \page listGET_OWNER_OF_NEXT_ENTRY listGET_OWNER_OF_NEXT_ENTRY
+ * \ingroup LinkedList
+ */
+#define listGET_OWNER_OF_NEXT_ENTRY( pxTCB, pxList )                                           \
+    {                                                                                          \
+        List_t * const pxConstList = ( pxList );                                               \
+        /* Increment the index to the next item and return the item, ensuring */               \
+        /* we don't return the marker used at the end of the list.  */                         \
+        ( pxConstList )->pxIndex = ( pxConstList )->pxIndex->pxNext;                           \
+        if( ( void * ) ( pxConstList )->pxIndex == ( void * ) &( ( pxConstList )->xListEnd ) ) \
+        {                                                                                      \
+            ( pxConstList )->pxIndex = ( pxConstList )->pxIndex->pxNext;                       \
+        }                                                                                      \
+        ( pxTCB ) = ( pxConstList )->pxIndex->pvOwner;                                         \
+    }
+
+/*
+ * Version of uxListRemove() that does not return a value.  Provided as a slight
+ * optimisation for xTaskIncrementTick() by being inline.
+ *
+ * Remove an item from a list.  The list item has a pointer to the list that
+ * it is in, so only the list item need be passed into the function.
+ *
+ * @param uxListRemove The item to be removed.  The item will remove itself from
+ * the list pointed to by it's pxContainer parameter.
+ *
+ * @return The number of items that remain in the list after the list item has
+ * been removed.
+ *
+ * \page listREMOVE_ITEM listREMOVE_ITEM
+ * \ingroup LinkedList
+ */
+#define listREMOVE_ITEM( pxItemToRemove ) \
+    {                                     \
+        /* The list item knows which list it is in.  Obtain the list from the list \
+         * item. */                                                              \
+        List_t * const pxList = ( pxItemToRemove )->pxContainer;                 \
+                                                                                 \
+        ( pxItemToRemove )->pxNext->pxPrevious = ( pxItemToRemove )->pxPrevious; \
+        ( pxItemToRemove )->pxPrevious->pxNext = ( pxItemToRemove )->pxNext;     \
+        /* Make sure the index is left pointing to a valid item. */              \
+        if( pxList->pxIndex == ( pxItemToRemove ) )                              \
+        {                                                                        \
+            pxList->pxIndex = ( pxItemToRemove )->pxPrevious;                    \
+        }                                                                        \
+                                                                                 \
+        ( pxItemToRemove )->pxContainer = NULL;                                  \
+        ( pxList->uxNumberOfItems )--;                                           \
+    }
+
+/*
+ * Inline version of vListInsertEnd() to provide slight optimisation for
+ * xTaskIncrementTick().
+ *
+ * Insert a list item into a list.  The item will be inserted in a position
+ * such that it will be the last item within the list returned by multiple
+ * calls to listGET_OWNER_OF_NEXT_ENTRY.
+ *
+ * The list member pxIndex is used to walk through a list.  Calling
+ * listGET_OWNER_OF_NEXT_ENTRY increments pxIndex to the next item in the list.
+ * Placing an item in a list using vListInsertEnd effectively places the item
+ * in the list position pointed to by pxIndex.  This means that every other
+ * item within the list will be returned by listGET_OWNER_OF_NEXT_ENTRY before
+ * the pxIndex parameter again points to the item being inserted.
+ *
+ * @param pxList The list into which the item is to be inserted.
+ *
+ * @param pxNewListItem The list item to be inserted into the list.
+ *
+ * \page listINSERT_END listINSERT_END
+ * \ingroup LinkedList
+ */
+#define listINSERT_END( pxList, pxNewListItem )           \
+    {                                                     \
+        ListItem_t * const pxIndex = ( pxList )->pxIndex; \
+                                                          \
+        /* Only effective when configASSERT() is also defined, these tests may catch \
+         * the list data structures being overwritten in memory.  They will not catch \
+         * data errors caused by incorrect configuration or use of FreeRTOS. */ \
+        listTEST_LIST_INTEGRITY( ( pxList ) );                                  \
+        listTEST_LIST_ITEM_INTEGRITY( ( pxNewListItem ) );                      \
+                                                                                \
+        /* Insert a new list item into ( pxList ), but rather than sort the list, \
+         * makes the new list item the last item to be removed by a call to \
+         * listGET_OWNER_OF_NEXT_ENTRY(). */                 \
+        ( pxNewListItem )->pxNext = pxIndex;                 \
+        ( pxNewListItem )->pxPrevious = pxIndex->pxPrevious; \
+                                                             \
+        pxIndex->pxPrevious->pxNext = ( pxNewListItem );     \
+        pxIndex->pxPrevious = ( pxNewListItem );             \
+                                                             \
+        /* Remember which list the item is in. */            \
+        ( pxNewListItem )->pxContainer = ( pxList );         \
+                                                             \
+        ( ( pxList )->uxNumberOfItems )++;                   \
+    }
+
+/*
+ * Access function to obtain the owner of the first entry in a list.  Lists
+ * are normally sorted in ascending item value order.
+ *
+ * This function returns the pxOwner member of the first item in the list.
+ * The pxOwner parameter of a list item is a pointer to the object that owns
+ * the list item.  In the scheduler this is normally a task control block.
+ * The pxOwner parameter effectively creates a two way link between the list
+ * item and its owner.
+ *
+ * @param pxList The list from which the owner of the head item is to be
+ * returned.
+ *
+ * \page listGET_OWNER_OF_HEAD_ENTRY listGET_OWNER_OF_HEAD_ENTRY
+ * \ingroup LinkedList
+ */
+#define listGET_OWNER_OF_HEAD_ENTRY( pxList )            ( ( &( ( pxList )->xListEnd ) )->pxNext->pvOwner )
+
+/*
+ * Check to see if a list item is within a list.  The list item maintains a
+ * "container" pointer that points to the list it is in.  All this macro does
+ * is check to see if the container and the list match.
+ *
+ * @param pxList The list we want to know if the list item is within.
+ * @param pxListItem The list item we want to know if is in the list.
+ * @return pdTRUE if the list item is in the list, otherwise pdFALSE.
+ */
+#define listIS_CONTAINED_WITHIN( pxList, pxListItem )    ( ( ( pxListItem )->pxContainer == ( pxList ) ) ? ( pdTRUE ) : ( pdFALSE ) )
+
+/*
+ * Return the list a list item is contained within (referenced from).
+ *
+ * @param pxListItem The list item being queried.
+ * @return A pointer to the List_t object that references the pxListItem
+ */
+#define listLIST_ITEM_CONTAINER( pxListItem )            ( ( pxListItem )->pxContainer )
+
+/*
+ * This provides a crude means of knowing if a list has been initialised, as
+ * pxList->xListEnd.xItemValue is set to portMAX_DELAY by the vListInitialise()
+ * function.
+ */
+#define listLIST_IS_INITIALISED( pxList )                ( ( pxList )->xListEnd.xItemValue == portMAX_DELAY )
+
+/*
+ * Must be called before a list is used!  This initialises all the members
+ * of the list structure and inserts the xListEnd item into the list as a
+ * marker to the back of the list.
+ *
+ * @param pxList Pointer to the list being initialised.
+ *
+ * \page vListInitialise vListInitialise
+ * \ingroup LinkedList
+ */
+void vListInitialise( List_t * const pxList ) PRIVILEGED_FUNCTION;
+
+/*
+ * Must be called before a list item is used.  This sets the list container to
+ * null so the item does not think that it is already contained in a list.
+ *
+ * @param pxItem Pointer to the list item being initialised.
+ *
+ * \page vListInitialiseItem vListInitialiseItem
+ * \ingroup LinkedList
+ */
+void vListInitialiseItem( ListItem_t * const pxItem ) PRIVILEGED_FUNCTION;
+
+/*
+ * Insert a list item into a list.  The item will be inserted into the list in
+ * a position determined by its item value (ascending item value order).
+ *
+ * @param pxList The list into which the item is to be inserted.
+ *
+ * @param pxNewListItem The item that is to be placed in the list.
+ *
+ * \page vListInsert vListInsert
+ * \ingroup LinkedList
+ */
+void vListInsert( List_t * const pxList,
+                  ListItem_t * const pxNewListItem ) PRIVILEGED_FUNCTION;
+
+/*
+ * Insert a list item into a list.  The item will be inserted in a position
+ * such that it will be the last item within the list returned by multiple
+ * calls to listGET_OWNER_OF_NEXT_ENTRY.
+ *
+ * The list member pxIndex is used to walk through a list.  Calling
+ * listGET_OWNER_OF_NEXT_ENTRY increments pxIndex to the next item in the list.
+ * Placing an item in a list using vListInsertEnd effectively places the item
+ * in the list position pointed to by pxIndex.  This means that every other
+ * item within the list will be returned by listGET_OWNER_OF_NEXT_ENTRY before
+ * the pxIndex parameter again points to the item being inserted.
+ *
+ * @param pxList The list into which the item is to be inserted.
+ *
+ * @param pxNewListItem The list item to be inserted into the list.
+ *
+ * \page vListInsertEnd vListInsertEnd
+ * \ingroup LinkedList
+ */
+void vListInsertEnd( List_t * const pxList,
+                     ListItem_t * const pxNewListItem ) PRIVILEGED_FUNCTION;
+
+/*
+ * Remove an item from a list.  The list item has a pointer to the list that
+ * it is in, so only the list item need be passed into the function.
+ *
+ * @param uxListRemove The item to be removed.  The item will remove itself from
+ * the list pointed to by it's pxContainer parameter.
+ *
+ * @return The number of items that remain in the list after the list item has
+ * been removed.
+ *
+ * \page uxListRemove uxListRemove
+ * \ingroup LinkedList
+ */
+UBaseType_t uxListRemove( ListItem_t * const pxItemToRemove ) PRIVILEGED_FUNCTION;
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+    }
+#endif
+/* *INDENT-ON* */
+
+#endif /* ifndef LIST_H */

freertos/Source/include/message_buffer.h

@@ -0,0 +1,823 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+
+/*
+ * Message buffers build functionality on top of FreeRTOS stream buffers.
+ * Whereas stream buffers are used to send a continuous stream of data from one
+ * task or interrupt to another, message buffers are used to send variable
+ * length discrete messages from one task or interrupt to another.  Their
+ * implementation is light weight, making them particularly suited for interrupt
+ * to task and core to core communication scenarios.
+ *
+ * ***NOTE***:  Uniquely among FreeRTOS objects, the stream buffer
+ * implementation (so also the message buffer implementation, as message buffers
+ * are built on top of stream buffers) assumes there is only one task or
+ * interrupt that will write to the buffer (the writer), and only one task or
+ * interrupt that will read from the buffer (the reader).  It is safe for the
+ * writer and reader to be different tasks or interrupts, but, unlike other
+ * FreeRTOS objects, it is not safe to have multiple different writers or
+ * multiple different readers.  If there are to be multiple different writers
+ * then the application writer must place each call to a writing API function
+ * (such as xMessageBufferSend()) inside a critical section and set the send
+ * block time to 0.  Likewise, if there are to be multiple different readers
+ * then the application writer must place each call to a reading API function
+ * (such as xMessageBufferRead()) inside a critical section and set the receive
+ * timeout to 0.
+ *
+ * Message buffers hold variable length messages.  To enable that, when a
+ * message is written to the message buffer an additional sizeof( size_t ) bytes
+ * are also written to store the message's length (that happens internally, with
+ * the API function).  sizeof( size_t ) is typically 4 bytes on a 32-bit
+ * architecture, so writing a 10 byte message to a message buffer on a 32-bit
+ * architecture will actually reduce the available space in the message buffer
+ * by 14 bytes (10 byte are used by the message, and 4 bytes to hold the length
+ * of the message).
+ */
+
+#ifndef FREERTOS_MESSAGE_BUFFER_H
+#define FREERTOS_MESSAGE_BUFFER_H
+
+#ifndef INC_FREERTOS_H
+    #error "include FreeRTOS.h must appear in source files before include message_buffer.h"
+#endif
+
+/* Message buffers are built onto of stream buffers. */
+#include "stream_buffer.h"
+
+/* *INDENT-OFF* */
+#if defined( __cplusplus )
+    extern "C" {
+#endif
+/* *INDENT-ON* */
+
+/**
+ * Type by which message buffers are referenced.  For example, a call to
+ * xMessageBufferCreate() returns an MessageBufferHandle_t variable that can
+ * then be used as a parameter to xMessageBufferSend(), xMessageBufferReceive(),
+ * etc.
+ */
+typedef void * MessageBufferHandle_t;
+
+/*-----------------------------------------------------------*/
+
+/**
+ * message_buffer.h
+ *
+ * @code{c}
+ * MessageBufferHandle_t xMessageBufferCreate( size_t xBufferSizeBytes );
+ * @endcode
+ *
+ * Creates a new message buffer using dynamically allocated memory.  See
+ * xMessageBufferCreateStatic() for a version that uses statically allocated
+ * memory (memory that is allocated at compile time).
+ *
+ * configSUPPORT_DYNAMIC_ALLOCATION must be set to 1 or left undefined in
+ * FreeRTOSConfig.h for xMessageBufferCreate() to be available.
+ *
+ * @param xBufferSizeBytes The total number of bytes (not messages) the message
+ * buffer will be able to hold at any one time.  When a message is written to
+ * the message buffer an additional sizeof( size_t ) bytes are also written to
+ * store the message's length.  sizeof( size_t ) is typically 4 bytes on a
+ * 32-bit architecture, so on most 32-bit architectures a 10 byte message will
+ * take up 14 bytes of message buffer space.
+ *
+ * @return If NULL is returned, then the message buffer cannot be created
+ * because there is insufficient heap memory available for FreeRTOS to allocate
+ * the message buffer data structures and storage area.  A non-NULL value being
+ * returned indicates that the message buffer has been created successfully -
+ * the returned value should be stored as the handle to the created message
+ * buffer.
+ *
+ * Example use:
+ * @code{c}
+ *
+ * void vAFunction( void )
+ * {
+ * MessageBufferHandle_t xMessageBuffer;
+ * const size_t xMessageBufferSizeBytes = 100;
+ *
+ *  // Create a message buffer that can hold 100 bytes.  The memory used to hold
+ *  // both the message buffer structure and the messages themselves is allocated
+ *  // dynamically.  Each message added to the buffer consumes an additional 4
+ *  // bytes which are used to hold the lengh of the message.
+ *  xMessageBuffer = xMessageBufferCreate( xMessageBufferSizeBytes );
+ *
+ *  if( xMessageBuffer == NULL )
+ *  {
+ *      // There was not enough heap memory space available to create the
+ *      // message buffer.
+ *  }
+ *  else
+ *  {
+ *      // The message buffer was created successfully and can now be used.
+ *  }
+ *
+ * @endcode
+ * \defgroup xMessageBufferCreate xMessageBufferCreate
+ * \ingroup MessageBufferManagement
+ */
+#define xMessageBufferCreate( xBufferSizeBytes ) \
+    ( MessageBufferHandle_t ) xStreamBufferGenericCreate( xBufferSizeBytes, ( size_t ) 0, pdTRUE )
+
+/**
+ * message_buffer.h
+ *
+ * @code{c}
+ * MessageBufferHandle_t xMessageBufferCreateStatic( size_t xBufferSizeBytes,
+ *                                                uint8_t *pucMessageBufferStorageArea,
+ *                                                StaticMessageBuffer_t *pxStaticMessageBuffer );
+ * @endcode
+ * Creates a new message buffer using statically allocated memory.  See
+ * xMessageBufferCreate() for a version that uses dynamically allocated memory.
+ *
+ * @param xBufferSizeBytes The size, in bytes, of the buffer pointed to by the
+ * pucMessageBufferStorageArea parameter.  When a message is written to the
+ * message buffer an additional sizeof( size_t ) bytes are also written to store
+ * the message's length.  sizeof( size_t ) is typically 4 bytes on a 32-bit
+ * architecture, so on most 32-bit architecture a 10 byte message will take up
+ * 14 bytes of message buffer space.  The maximum number of bytes that can be
+ * stored in the message buffer is actually (xBufferSizeBytes - 1).
+ *
+ * @param pucMessageBufferStorageArea Must point to a uint8_t array that is at
+ * least xBufferSizeBytes big.  This is the array to which messages are
+ * copied when they are written to the message buffer.
+ *
+ * @param pxStaticMessageBuffer Must point to a variable of type
+ * StaticMessageBuffer_t, which will be used to hold the message buffer's data
+ * structure.
+ *
+ * @return If the message buffer is created successfully then a handle to the
+ * created message buffer is returned. If either pucMessageBufferStorageArea or
+ * pxStaticmessageBuffer are NULL then NULL is returned.
+ *
+ * Example use:
+ * @code{c}
+ *
+ * // Used to dimension the array used to hold the messages.  The available space
+ * // will actually be one less than this, so 999.
+ #define STORAGE_SIZE_BYTES 1000
+ *
+ * // Defines the memory that will actually hold the messages within the message
+ * // buffer.
+ * static uint8_t ucStorageBuffer[ STORAGE_SIZE_BYTES ];
+ *
+ * // The variable used to hold the message buffer structure.
+ * StaticMessageBuffer_t xMessageBufferStruct;
+ *
+ * void MyFunction( void )
+ * {
+ * MessageBufferHandle_t xMessageBuffer;
+ *
+ *  xMessageBuffer = xMessageBufferCreateStatic( sizeof( ucStorageBuffer ),
+ *                                               ucStorageBuffer,
+ *                                               &xMessageBufferStruct );
+ *
+ *  // As neither the pucMessageBufferStorageArea or pxStaticMessageBuffer
+ *  // parameters were NULL, xMessageBuffer will not be NULL, and can be used to
+ *  // reference the created message buffer in other message buffer API calls.
+ *
+ *  // Other code that uses the message buffer can go here.
+ * }
+ *
+ * @endcode
+ * \defgroup xMessageBufferCreateStatic xMessageBufferCreateStatic
+ * \ingroup MessageBufferManagement
+ */
+#define xMessageBufferCreateStatic( xBufferSizeBytes, pucMessageBufferStorageArea, pxStaticMessageBuffer ) \
+    ( MessageBufferHandle_t ) xStreamBufferGenericCreateStatic( xBufferSizeBytes, 0, pdTRUE, pucMessageBufferStorageArea, pxStaticMessageBuffer )
+
+/**
+ * message_buffer.h
+ *
+ * @code{c}
+ * size_t xMessageBufferSend( MessageBufferHandle_t xMessageBuffer,
+ *                         const void *pvTxData,
+ *                         size_t xDataLengthBytes,
+ *                         TickType_t xTicksToWait );
+ * @endcode
+ *
+ * Sends a discrete message to the message buffer.  The message can be any
+ * length that fits within the buffer's free space, and is copied into the
+ * buffer.
+ *
+ * ***NOTE***:  Uniquely among FreeRTOS objects, the stream buffer
+ * implementation (so also the message buffer implementation, as message buffers
+ * are built on top of stream buffers) assumes there is only one task or
+ * interrupt that will write to the buffer (the writer), and only one task or
+ * interrupt that will read from the buffer (the reader).  It is safe for the
+ * writer and reader to be different tasks or interrupts, but, unlike other
+ * FreeRTOS objects, it is not safe to have multiple different writers or
+ * multiple different readers.  If there are to be multiple different writers
+ * then the application writer must place each call to a writing API function
+ * (such as xMessageBufferSend()) inside a critical section and set the send
+ * block time to 0.  Likewise, if there are to be multiple different readers
+ * then the application writer must place each call to a reading API function
+ * (such as xMessageBufferRead()) inside a critical section and set the receive
+ * block time to 0.
+ *
+ * Use xMessageBufferSend() to write to a message buffer from a task.  Use
+ * xMessageBufferSendFromISR() to write to a message buffer from an interrupt
+ * service routine (ISR).
+ *
+ * @param xMessageBuffer The handle of the message buffer to which a message is
+ * being sent.
+ *
+ * @param pvTxData A pointer to the message that is to be copied into the
+ * message buffer.
+ *
+ * @param xDataLengthBytes The length of the message.  That is, the number of
+ * bytes to copy from pvTxData into the message buffer.  When a message is
+ * written to the message buffer an additional sizeof( size_t ) bytes are also
+ * written to store the message's length.  sizeof( size_t ) is typically 4 bytes
+ * on a 32-bit architecture, so on most 32-bit architecture setting
+ * xDataLengthBytes to 20 will reduce the free space in the message buffer by 24
+ * bytes (20 bytes of message data and 4 bytes to hold the message length).
+ *
+ * @param xTicksToWait The maximum amount of time the calling task should remain
+ * in the Blocked state to wait for enough space to become available in the
+ * message buffer, should the message buffer have insufficient space when
+ * xMessageBufferSend() is called.  The calling task will never block if
+ * xTicksToWait is zero.  The block time is specified in tick periods, so the
+ * absolute time it represents is dependent on the tick frequency.  The macro
+ * pdMS_TO_TICKS() can be used to convert a time specified in milliseconds into
+ * a time specified in ticks.  Setting xTicksToWait to portMAX_DELAY will cause
+ * the task to wait indefinitely (without timing out), provided
+ * INCLUDE_vTaskSuspend is set to 1 in FreeRTOSConfig.h.  Tasks do not use any
+ * CPU time when they are in the Blocked state.
+ *
+ * @return The number of bytes written to the message buffer.  If the call to
+ * xMessageBufferSend() times out before there was enough space to write the
+ * message into the message buffer then zero is returned.  If the call did not
+ * time out then xDataLengthBytes is returned.
+ *
+ * Example use:
+ * @code{c}
+ * void vAFunction( MessageBufferHandle_t xMessageBuffer )
+ * {
+ * size_t xBytesSent;
+ * uint8_t ucArrayToSend[] = { 0, 1, 2, 3 };
+ * char *pcStringToSend = "String to send";
+ * const TickType_t x100ms = pdMS_TO_TICKS( 100 );
+ *
+ *  // Send an array to the message buffer, blocking for a maximum of 100ms to
+ *  // wait for enough space to be available in the message buffer.
+ *  xBytesSent = xMessageBufferSend( xMessageBuffer, ( void * ) ucArrayToSend, sizeof( ucArrayToSend ), x100ms );
+ *
+ *  if( xBytesSent != sizeof( ucArrayToSend ) )
+ *  {
+ *      // The call to xMessageBufferSend() times out before there was enough
+ *      // space in the buffer for the data to be written.
+ *  }
+ *
+ *  // Send the string to the message buffer.  Return immediately if there is
+ *  // not enough space in the buffer.
+ *  xBytesSent = xMessageBufferSend( xMessageBuffer, ( void * ) pcStringToSend, strlen( pcStringToSend ), 0 );
+ *
+ *  if( xBytesSent != strlen( pcStringToSend ) )
+ *  {
+ *      // The string could not be added to the message buffer because there was
+ *      // not enough free space in the buffer.
+ *  }
+ * }
+ * @endcode
+ * \defgroup xMessageBufferSend xMessageBufferSend
+ * \ingroup MessageBufferManagement
+ */
+#define xMessageBufferSend( xMessageBuffer, pvTxData, xDataLengthBytes, xTicksToWait ) \
+    xStreamBufferSend( ( StreamBufferHandle_t ) xMessageBuffer, pvTxData, xDataLengthBytes, xTicksToWait )
+
+/**
+ * message_buffer.h
+ *
+ * @code{c}
+ * size_t xMessageBufferSendFromISR( MessageBufferHandle_t xMessageBuffer,
+ *                                const void *pvTxData,
+ *                                size_t xDataLengthBytes,
+ *                                BaseType_t *pxHigherPriorityTaskWoken );
+ * @endcode
+ *
+ * Interrupt safe version of the API function that sends a discrete message to
+ * the message buffer.  The message can be any length that fits within the
+ * buffer's free space, and is copied into the buffer.
+ *
+ * ***NOTE***:  Uniquely among FreeRTOS objects, the stream buffer
+ * implementation (so also the message buffer implementation, as message buffers
+ * are built on top of stream buffers) assumes there is only one task or
+ * interrupt that will write to the buffer (the writer), and only one task or
+ * interrupt that will read from the buffer (the reader).  It is safe for the
+ * writer and reader to be different tasks or interrupts, but, unlike other
+ * FreeRTOS objects, it is not safe to have multiple different writers or
+ * multiple different readers.  If there are to be multiple different writers
+ * then the application writer must place each call to a writing API function
+ * (such as xMessageBufferSend()) inside a critical section and set the send
+ * block time to 0.  Likewise, if there are to be multiple different readers
+ * then the application writer must place each call to a reading API function
+ * (such as xMessageBufferRead()) inside a critical section and set the receive
+ * block time to 0.
+ *
+ * Use xMessageBufferSend() to write to a message buffer from a task.  Use
+ * xMessageBufferSendFromISR() to write to a message buffer from an interrupt
+ * service routine (ISR).
+ *
+ * @param xMessageBuffer The handle of the message buffer to which a message is
+ * being sent.
+ *
+ * @param pvTxData A pointer to the message that is to be copied into the
+ * message buffer.
+ *
+ * @param xDataLengthBytes The length of the message.  That is, the number of
+ * bytes to copy from pvTxData into the message buffer.  When a message is
+ * written to the message buffer an additional sizeof( size_t ) bytes are also
+ * written to store the message's length.  sizeof( size_t ) is typically 4 bytes
+ * on a 32-bit architecture, so on most 32-bit architecture setting
+ * xDataLengthBytes to 20 will reduce the free space in the message buffer by 24
+ * bytes (20 bytes of message data and 4 bytes to hold the message length).
+ *
+ * @param pxHigherPriorityTaskWoken  It is possible that a message buffer will
+ * have a task blocked on it waiting for data.  Calling
+ * xMessageBufferSendFromISR() can make data available, and so cause a task that
+ * was waiting for data to leave the Blocked state.  If calling
+ * xMessageBufferSendFromISR() causes a task to leave the Blocked state, and the
+ * unblocked task has a priority higher than the currently executing task (the
+ * task that was interrupted), then, internally, xMessageBufferSendFromISR()
+ * will set *pxHigherPriorityTaskWoken to pdTRUE.  If
+ * xMessageBufferSendFromISR() sets this value to pdTRUE, then normally a
+ * context switch should be performed before the interrupt is exited.  This will
+ * ensure that the interrupt returns directly to the highest priority Ready
+ * state task.  *pxHigherPriorityTaskWoken should be set to pdFALSE before it
+ * is passed into the function.  See the code example below for an example.
+ *
+ * @return The number of bytes actually written to the message buffer.  If the
+ * message buffer didn't have enough free space for the message to be stored
+ * then 0 is returned, otherwise xDataLengthBytes is returned.
+ *
+ * Example use:
+ * @code{c}
+ * // A message buffer that has already been created.
+ * MessageBufferHandle_t xMessageBuffer;
+ *
+ * void vAnInterruptServiceRoutine( void )
+ * {
+ * size_t xBytesSent;
+ * char *pcStringToSend = "String to send";
+ * BaseType_t xHigherPriorityTaskWoken = pdFALSE; // Initialised to pdFALSE.
+ *
+ *  // Attempt to send the string to the message buffer.
+ *  xBytesSent = xMessageBufferSendFromISR( xMessageBuffer,
+ *                                          ( void * ) pcStringToSend,
+ *                                          strlen( pcStringToSend ),
+ *                                          &xHigherPriorityTaskWoken );
+ *
+ *  if( xBytesSent != strlen( pcStringToSend ) )
+ *  {
+ *      // The string could not be added to the message buffer because there was
+ *      // not enough free space in the buffer.
+ *  }
+ *
+ *  // If xHigherPriorityTaskWoken was set to pdTRUE inside
+ *  // xMessageBufferSendFromISR() then a task that has a priority above the
+ *  // priority of the currently executing task was unblocked and a context
+ *  // switch should be performed to ensure the ISR returns to the unblocked
+ *  // task.  In most FreeRTOS ports this is done by simply passing
+ *  // xHigherPriorityTaskWoken into portYIELD_FROM_ISR(), which will test the
+ *  // variables value, and perform the context switch if necessary.  Check the
+ *  // documentation for the port in use for port specific instructions.
+ *  portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
+ * }
+ * @endcode
+ * \defgroup xMessageBufferSendFromISR xMessageBufferSendFromISR
+ * \ingroup MessageBufferManagement
+ */
+#define xMessageBufferSendFromISR( xMessageBuffer, pvTxData, xDataLengthBytes, pxHigherPriorityTaskWoken ) \
+    xStreamBufferSendFromISR( ( StreamBufferHandle_t ) xMessageBuffer, pvTxData, xDataLengthBytes, pxHigherPriorityTaskWoken )
+
+/**
+ * message_buffer.h
+ *
+ * @code{c}
+ * size_t xMessageBufferReceive( MessageBufferHandle_t xMessageBuffer,
+ *                            void *pvRxData,
+ *                            size_t xBufferLengthBytes,
+ *                            TickType_t xTicksToWait );
+ * @endcode
+ *
+ * Receives a discrete message from a message buffer.  Messages can be of
+ * variable length and are copied out of the buffer.
+ *
+ * ***NOTE***:  Uniquely among FreeRTOS objects, the stream buffer
+ * implementation (so also the message buffer implementation, as message buffers
+ * are built on top of stream buffers) assumes there is only one task or
+ * interrupt that will write to the buffer (the writer), and only one task or
+ * interrupt that will read from the buffer (the reader).  It is safe for the
+ * writer and reader to be different tasks or interrupts, but, unlike other
+ * FreeRTOS objects, it is not safe to have multiple different writers or
+ * multiple different readers.  If there are to be multiple different writers
+ * then the application writer must place each call to a writing API function
+ * (such as xMessageBufferSend()) inside a critical section and set the send
+ * block time to 0.  Likewise, if there are to be multiple different readers
+ * then the application writer must place each call to a reading API function
+ * (such as xMessageBufferRead()) inside a critical section and set the receive
+ * block time to 0.
+ *
+ * Use xMessageBufferReceive() to read from a message buffer from a task.  Use
+ * xMessageBufferReceiveFromISR() to read from a message buffer from an
+ * interrupt service routine (ISR).
+ *
+ * @param xMessageBuffer The handle of the message buffer from which a message
+ * is being received.
+ *
+ * @param pvRxData A pointer to the buffer into which the received message is
+ * to be copied.
+ *
+ * @param xBufferLengthBytes The length of the buffer pointed to by the pvRxData
+ * parameter.  This sets the maximum length of the message that can be received.
+ * If xBufferLengthBytes is too small to hold the next message then the message
+ * will be left in the message buffer and 0 will be returned.
+ *
+ * @param xTicksToWait The maximum amount of time the task should remain in the
+ * Blocked state to wait for a message, should the message buffer be empty.
+ * xMessageBufferReceive() will return immediately if xTicksToWait is zero and
+ * the message buffer is empty.  The block time is specified in tick periods, so
+ * the absolute time it represents is dependent on the tick frequency.  The
+ * macro pdMS_TO_TICKS() can be used to convert a time specified in milliseconds
+ * into a time specified in ticks.  Setting xTicksToWait to portMAX_DELAY will
+ * cause the task to wait indefinitely (without timing out), provided
+ * INCLUDE_vTaskSuspend is set to 1 in FreeRTOSConfig.h.  Tasks do not use any
+ * CPU time when they are in the Blocked state.
+ *
+ * @return The length, in bytes, of the message read from the message buffer, if
+ * any.  If xMessageBufferReceive() times out before a message became available
+ * then zero is returned.  If the length of the message is greater than
+ * xBufferLengthBytes then the message will be left in the message buffer and
+ * zero is returned.
+ *
+ * Example use:
+ * @code{c}
+ * void vAFunction( MessageBuffer_t xMessageBuffer )
+ * {
+ * uint8_t ucRxData[ 20 ];
+ * size_t xReceivedBytes;
+ * const TickType_t xBlockTime = pdMS_TO_TICKS( 20 );
+ *
+ *  // Receive the next message from the message buffer.  Wait in the Blocked
+ *  // state (so not using any CPU processing time) for a maximum of 100ms for
+ *  // a message to become available.
+ *  xReceivedBytes = xMessageBufferReceive( xMessageBuffer,
+ *                                          ( void * ) ucRxData,
+ *                                          sizeof( ucRxData ),
+ *                                          xBlockTime );
+ *
+ *  if( xReceivedBytes > 0 )
+ *  {
+ *      // A ucRxData contains a message that is xReceivedBytes long.  Process
+ *      // the message here....
+ *  }
+ * }
+ * @endcode
+ * \defgroup xMessageBufferReceive xMessageBufferReceive
+ * \ingroup MessageBufferManagement
+ */
+#define xMessageBufferReceive( xMessageBuffer, pvRxData, xBufferLengthBytes, xTicksToWait ) \
+    xStreamBufferReceive( ( StreamBufferHandle_t ) xMessageBuffer, pvRxData, xBufferLengthBytes, xTicksToWait )
+
+
+/**
+ * message_buffer.h
+ *
+ * @code{c}
+ * size_t xMessageBufferReceiveFromISR( MessageBufferHandle_t xMessageBuffer,
+ *                                   void *pvRxData,
+ *                                   size_t xBufferLengthBytes,
+ *                                   BaseType_t *pxHigherPriorityTaskWoken );
+ * @endcode
+ *
+ * An interrupt safe version of the API function that receives a discrete
+ * message from a message buffer.  Messages can be of variable length and are
+ * copied out of the buffer.
+ *
+ * ***NOTE***:  Uniquely among FreeRTOS objects, the stream buffer
+ * implementation (so also the message buffer implementation, as message buffers
+ * are built on top of stream buffers) assumes there is only one task or
+ * interrupt that will write to the buffer (the writer), and only one task or
+ * interrupt that will read from the buffer (the reader).  It is safe for the
+ * writer and reader to be different tasks or interrupts, but, unlike other
+ * FreeRTOS objects, it is not safe to have multiple different writers or
+ * multiple different readers.  If there are to be multiple different writers
+ * then the application writer must place each call to a writing API function
+ * (such as xMessageBufferSend()) inside a critical section and set the send
+ * block time to 0.  Likewise, if there are to be multiple different readers
+ * then the application writer must place each call to a reading API function
+ * (such as xMessageBufferRead()) inside a critical section and set the receive
+ * block time to 0.
+ *
+ * Use xMessageBufferReceive() to read from a message buffer from a task.  Use
+ * xMessageBufferReceiveFromISR() to read from a message buffer from an
+ * interrupt service routine (ISR).
+ *
+ * @param xMessageBuffer The handle of the message buffer from which a message
+ * is being received.
+ *
+ * @param pvRxData A pointer to the buffer into which the received message is
+ * to be copied.
+ *
+ * @param xBufferLengthBytes The length of the buffer pointed to by the pvRxData
+ * parameter.  This sets the maximum length of the message that can be received.
+ * If xBufferLengthBytes is too small to hold the next message then the message
+ * will be left in the message buffer and 0 will be returned.
+ *
+ * @param pxHigherPriorityTaskWoken  It is possible that a message buffer will
+ * have a task blocked on it waiting for space to become available.  Calling
+ * xMessageBufferReceiveFromISR() can make space available, and so cause a task
+ * that is waiting for space to leave the Blocked state.  If calling
+ * xMessageBufferReceiveFromISR() causes a task to leave the Blocked state, and
+ * the unblocked task has a priority higher than the currently executing task
+ * (the task that was interrupted), then, internally,
+ * xMessageBufferReceiveFromISR() will set *pxHigherPriorityTaskWoken to pdTRUE.
+ * If xMessageBufferReceiveFromISR() sets this value to pdTRUE, then normally a
+ * context switch should be performed before the interrupt is exited.  That will
+ * ensure the interrupt returns directly to the highest priority Ready state
+ * task.  *pxHigherPriorityTaskWoken should be set to pdFALSE before it is
+ * passed into the function.  See the code example below for an example.
+ *
+ * @return The length, in bytes, of the message read from the message buffer, if
+ * any.
+ *
+ * Example use:
+ * @code{c}
+ * // A message buffer that has already been created.
+ * MessageBuffer_t xMessageBuffer;
+ *
+ * void vAnInterruptServiceRoutine( void )
+ * {
+ * uint8_t ucRxData[ 20 ];
+ * size_t xReceivedBytes;
+ * BaseType_t xHigherPriorityTaskWoken = pdFALSE;  // Initialised to pdFALSE.
+ *
+ *  // Receive the next message from the message buffer.
+ *  xReceivedBytes = xMessageBufferReceiveFromISR( xMessageBuffer,
+ *                                                ( void * ) ucRxData,
+ *                                                sizeof( ucRxData ),
+ *                                                &xHigherPriorityTaskWoken );
+ *
+ *  if( xReceivedBytes > 0 )
+ *  {
+ *      // A ucRxData contains a message that is xReceivedBytes long.  Process
+ *      // the message here....
+ *  }
+ *
+ *  // If xHigherPriorityTaskWoken was set to pdTRUE inside
+ *  // xMessageBufferReceiveFromISR() then a task that has a priority above the
+ *  // priority of the currently executing task was unblocked and a context
+ *  // switch should be performed to ensure the ISR returns to the unblocked
+ *  // task.  In most FreeRTOS ports this is done by simply passing
+ *  // xHigherPriorityTaskWoken into portYIELD_FROM_ISR(), which will test the
+ *  // variables value, and perform the context switch if necessary.  Check the
+ *  // documentation for the port in use for port specific instructions.
+ *  portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
+ * }
+ * @endcode
+ * \defgroup xMessageBufferReceiveFromISR xMessageBufferReceiveFromISR
+ * \ingroup MessageBufferManagement
+ */
+#define xMessageBufferReceiveFromISR( xMessageBuffer, pvRxData, xBufferLengthBytes, pxHigherPriorityTaskWoken ) \
+    xStreamBufferReceiveFromISR( ( StreamBufferHandle_t ) xMessageBuffer, pvRxData, xBufferLengthBytes, pxHigherPriorityTaskWoken )
+
+/**
+ * message_buffer.h
+ *
+ * @code{c}
+ * void vMessageBufferDelete( MessageBufferHandle_t xMessageBuffer );
+ * @endcode
+ *
+ * Deletes a message buffer that was previously created using a call to
+ * xMessageBufferCreate() or xMessageBufferCreateStatic().  If the message
+ * buffer was created using dynamic memory (that is, by xMessageBufferCreate()),
+ * then the allocated memory is freed.
+ *
+ * A message buffer handle must not be used after the message buffer has been
+ * deleted.
+ *
+ * @param xMessageBuffer The handle of the message buffer to be deleted.
+ *
+ */
+#define vMessageBufferDelete( xMessageBuffer ) \
+    vStreamBufferDelete( ( StreamBufferHandle_t ) xMessageBuffer )
+
+/**
+ * message_buffer.h
+ * @code{c}
+ * BaseType_t xMessageBufferIsFull( MessageBufferHandle_t xMessageBuffer );
+ * @endcode
+ *
+ * Tests to see if a message buffer is full.  A message buffer is full if it
+ * cannot accept any more messages, of any size, until space is made available
+ * by a message being removed from the message buffer.
+ *
+ * @param xMessageBuffer The handle of the message buffer being queried.
+ *
+ * @return If the message buffer referenced by xMessageBuffer is full then
+ * pdTRUE is returned.  Otherwise pdFALSE is returned.
+ */
+#define xMessageBufferIsFull( xMessageBuffer ) \
+    xStreamBufferIsFull( ( StreamBufferHandle_t ) xMessageBuffer )
+
+/**
+ * message_buffer.h
+ * @code{c}
+ * BaseType_t xMessageBufferIsEmpty( MessageBufferHandle_t xMessageBuffer );
+ * @endcode
+ *
+ * Tests to see if a message buffer is empty (does not contain any messages).
+ *
+ * @param xMessageBuffer The handle of the message buffer being queried.
+ *
+ * @return If the message buffer referenced by xMessageBuffer is empty then
+ * pdTRUE is returned.  Otherwise pdFALSE is returned.
+ *
+ */
+#define xMessageBufferIsEmpty( xMessageBuffer ) \
+    xStreamBufferIsEmpty( ( StreamBufferHandle_t ) xMessageBuffer )
+
+/**
+ * message_buffer.h
+ * @code{c}
+ * BaseType_t xMessageBufferReset( MessageBufferHandle_t xMessageBuffer );
+ * @endcode
+ *
+ * Resets a message buffer to its initial empty state, discarding any message it
+ * contained.
+ *
+ * A message buffer can only be reset if there are no tasks blocked on it.
+ *
+ * @param xMessageBuffer The handle of the message buffer being reset.
+ *
+ * @return If the message buffer was reset then pdPASS is returned.  If the
+ * message buffer could not be reset because either there was a task blocked on
+ * the message queue to wait for space to become available, or to wait for a
+ * a message to be available, then pdFAIL is returned.
+ *
+ * \defgroup xMessageBufferReset xMessageBufferReset
+ * \ingroup MessageBufferManagement
+ */
+#define xMessageBufferReset( xMessageBuffer ) \
+    xStreamBufferReset( ( StreamBufferHandle_t ) xMessageBuffer )
+
+
+/**
+ * message_buffer.h
+ * @code{c}
+ * size_t xMessageBufferSpaceAvailable( MessageBufferHandle_t xMessageBuffer );
+ * @endcode
+ * Returns the number of bytes of free space in the message buffer.
+ *
+ * @param xMessageBuffer The handle of the message buffer being queried.
+ *
+ * @return The number of bytes that can be written to the message buffer before
+ * the message buffer would be full.  When a message is written to the message
+ * buffer an additional sizeof( size_t ) bytes are also written to store the
+ * message's length.  sizeof( size_t ) is typically 4 bytes on a 32-bit
+ * architecture, so if xMessageBufferSpacesAvailable() returns 10, then the size
+ * of the largest message that can be written to the message buffer is 6 bytes.
+ *
+ * \defgroup xMessageBufferSpaceAvailable xMessageBufferSpaceAvailable
+ * \ingroup MessageBufferManagement
+ */
+#define xMessageBufferSpaceAvailable( xMessageBuffer ) \
+    xStreamBufferSpacesAvailable( ( StreamBufferHandle_t ) xMessageBuffer )
+#define xMessageBufferSpacesAvailable( xMessageBuffer ) \
+    xStreamBufferSpacesAvailable( ( StreamBufferHandle_t ) xMessageBuffer ) /* Corrects typo in original macro name. */
+
+/**
+ * message_buffer.h
+ * @code{c}
+ * size_t xMessageBufferNextLengthBytes( MessageBufferHandle_t xMessageBuffer );
+ * @endcode
+ * Returns the length (in bytes) of the next message in a message buffer.
+ * Useful if xMessageBufferReceive() returned 0 because the size of the buffer
+ * passed into xMessageBufferReceive() was too small to hold the next message.
+ *
+ * @param xMessageBuffer The handle of the message buffer being queried.
+ *
+ * @return The length (in bytes) of the next message in the message buffer, or 0
+ * if the message buffer is empty.
+ *
+ * \defgroup xMessageBufferNextLengthBytes xMessageBufferNextLengthBytes
+ * \ingroup MessageBufferManagement
+ */
+#define xMessageBufferNextLengthBytes( xMessageBuffer ) \
+    xStreamBufferNextMessageLengthBytes( ( StreamBufferHandle_t ) xMessageBuffer ) PRIVILEGED_FUNCTION;
+
+/**
+ * message_buffer.h
+ *
+ * @code{c}
+ * BaseType_t xMessageBufferSendCompletedFromISR( MessageBufferHandle_t xMessageBuffer, BaseType_t *pxHigherPriorityTaskWoken );
+ * @endcode
+ *
+ * For advanced users only.
+ *
+ * The sbSEND_COMPLETED() macro is called from within the FreeRTOS APIs when
+ * data is sent to a message buffer or stream buffer.  If there was a task that
+ * was blocked on the message or stream buffer waiting for data to arrive then
+ * the sbSEND_COMPLETED() macro sends a notification to the task to remove it
+ * from the Blocked state.  xMessageBufferSendCompletedFromISR() does the same
+ * thing.  It is provided to enable application writers to implement their own
+ * version of sbSEND_COMPLETED(), and MUST NOT BE USED AT ANY OTHER TIME.
+ *
+ * See the example implemented in FreeRTOS/Demo/Minimal/MessageBufferAMP.c for
+ * additional information.
+ *
+ * @param xMessageBuffer The handle of the stream buffer to which data was
+ * written.
+ *
+ * @param pxHigherPriorityTaskWoken *pxHigherPriorityTaskWoken should be
+ * initialised to pdFALSE before it is passed into
+ * xMessageBufferSendCompletedFromISR().  If calling
+ * xMessageBufferSendCompletedFromISR() removes a task from the Blocked state,
+ * and the task has a priority above the priority of the currently running task,
+ * then *pxHigherPriorityTaskWoken will get set to pdTRUE indicating that a
+ * context switch should be performed before exiting the ISR.
+ *
+ * @return If a task was removed from the Blocked state then pdTRUE is returned.
+ * Otherwise pdFALSE is returned.
+ *
+ * \defgroup xMessageBufferSendCompletedFromISR xMessageBufferSendCompletedFromISR
+ * \ingroup StreamBufferManagement
+ */
+#define xMessageBufferSendCompletedFromISR( xMessageBuffer, pxHigherPriorityTaskWoken ) \
+    xStreamBufferSendCompletedFromISR( ( StreamBufferHandle_t ) xMessageBuffer, pxHigherPriorityTaskWoken )
+
+/**
+ * message_buffer.h
+ *
+ * @code{c}
+ * BaseType_t xMessageBufferReceiveCompletedFromISR( MessageBufferHandle_t xMessageBuffer, BaseType_t *pxHigherPriorityTaskWoken );
+ * @endcode
+ *
+ * For advanced users only.
+ *
+ * The sbRECEIVE_COMPLETED() macro is called from within the FreeRTOS APIs when
+ * data is read out of a message buffer or stream buffer.  If there was a task
+ * that was blocked on the message or stream buffer waiting for data to arrive
+ * then the sbRECEIVE_COMPLETED() macro sends a notification to the task to
+ * remove it from the Blocked state.  xMessageBufferReceiveCompletedFromISR()
+ * does the same thing.  It is provided to enable application writers to
+ * implement their own version of sbRECEIVE_COMPLETED(), and MUST NOT BE USED AT
+ * ANY OTHER TIME.
+ *
+ * See the example implemented in FreeRTOS/Demo/Minimal/MessageBufferAMP.c for
+ * additional information.
+ *
+ * @param xMessageBuffer The handle of the stream buffer from which data was
+ * read.
+ *
+ * @param pxHigherPriorityTaskWoken *pxHigherPriorityTaskWoken should be
+ * initialised to pdFALSE before it is passed into
+ * xMessageBufferReceiveCompletedFromISR().  If calling
+ * xMessageBufferReceiveCompletedFromISR() removes a task from the Blocked state,
+ * and the task has a priority above the priority of the currently running task,
+ * then *pxHigherPriorityTaskWoken will get set to pdTRUE indicating that a
+ * context switch should be performed before exiting the ISR.
+ *
+ * @return If a task was removed from the Blocked state then pdTRUE is returned.
+ * Otherwise pdFALSE is returned.
+ *
+ * \defgroup xMessageBufferReceiveCompletedFromISR xMessageBufferReceiveCompletedFromISR
+ * \ingroup StreamBufferManagement
+ */
+#define xMessageBufferReceiveCompletedFromISR( xMessageBuffer, pxHigherPriorityTaskWoken ) \
+    xStreamBufferReceiveCompletedFromISR( ( StreamBufferHandle_t ) xMessageBuffer, pxHigherPriorityTaskWoken )
+
+/* *INDENT-OFF* */
+#if defined( __cplusplus )
+    } /* extern "C" */
+#endif
+/* *INDENT-ON* */
+
+#endif /* !defined( FREERTOS_MESSAGE_BUFFER_H ) */

freertos/Source/include/mpu_prototypes.h

@@ -0,0 +1,260 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+/*
+ * When the MPU is used the standard (non MPU) API functions are mapped to
+ * equivalents that start "MPU_", the prototypes for which are defined in this
+ * header files.  This will cause the application code to call the MPU_ version
+ * which wraps the non-MPU version with privilege promoting then demoting code,
+ * so the kernel code always runs will full privileges.
+ */
+
+
+#ifndef MPU_PROTOTYPES_H
+#define MPU_PROTOTYPES_H
+
+/* MPU versions of tasks.h API functions. */
+BaseType_t MPU_xTaskCreate( TaskFunction_t pxTaskCode,
+                            const char * const pcName,
+                            const uint16_t usStackDepth,
+                            void * const pvParameters,
+                            UBaseType_t uxPriority,
+                            TaskHandle_t * const pxCreatedTask ) FREERTOS_SYSTEM_CALL;
+TaskHandle_t MPU_xTaskCreateStatic( TaskFunction_t pxTaskCode,
+                                    const char * const pcName,
+                                    const uint32_t ulStackDepth,
+                                    void * const pvParameters,
+                                    UBaseType_t uxPriority,
+                                    StackType_t * const puxStackBuffer,
+                                    StaticTask_t * const pxTaskBuffer ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskDelete( TaskHandle_t xTaskToDelete ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskDelay( const TickType_t xTicksToDelay ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTaskDelayUntil( TickType_t * const pxPreviousWakeTime,
+                                const TickType_t xTimeIncrement ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTaskAbortDelay( TaskHandle_t xTask ) FREERTOS_SYSTEM_CALL;
+UBaseType_t MPU_uxTaskPriorityGet( const TaskHandle_t xTask ) FREERTOS_SYSTEM_CALL;
+eTaskState MPU_eTaskGetState( TaskHandle_t xTask ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskGetInfo( TaskHandle_t xTask,
+                       TaskStatus_t * pxTaskStatus,
+                       BaseType_t xGetFreeStackSpace,
+                       eTaskState eState ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskPrioritySet( TaskHandle_t xTask,
+                           UBaseType_t uxNewPriority ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskSuspend( TaskHandle_t xTaskToSuspend ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskResume( TaskHandle_t xTaskToResume ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskStartScheduler( void ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskSuspendAll( void ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTaskResumeAll( void ) FREERTOS_SYSTEM_CALL;
+TickType_t MPU_xTaskGetTickCount( void ) FREERTOS_SYSTEM_CALL;
+UBaseType_t MPU_uxTaskGetNumberOfTasks( void ) FREERTOS_SYSTEM_CALL;
+char * MPU_pcTaskGetName( TaskHandle_t xTaskToQuery ) FREERTOS_SYSTEM_CALL;
+TaskHandle_t MPU_xTaskGetHandle( const char * pcNameToQuery ) FREERTOS_SYSTEM_CALL;
+UBaseType_t MPU_uxTaskGetStackHighWaterMark( TaskHandle_t xTask ) FREERTOS_SYSTEM_CALL;
+configSTACK_DEPTH_TYPE MPU_uxTaskGetStackHighWaterMark2( TaskHandle_t xTask ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskSetApplicationTaskTag( TaskHandle_t xTask,
+                                     TaskHookFunction_t pxHookFunction ) FREERTOS_SYSTEM_CALL;
+TaskHookFunction_t MPU_xTaskGetApplicationTaskTag( TaskHandle_t xTask ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskSetThreadLocalStoragePointer( TaskHandle_t xTaskToSet,
+                                            BaseType_t xIndex,
+                                            void * pvValue ) FREERTOS_SYSTEM_CALL;
+void * MPU_pvTaskGetThreadLocalStoragePointer( TaskHandle_t xTaskToQuery,
+                                               BaseType_t xIndex ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTaskCallApplicationTaskHook( TaskHandle_t xTask,
+                                             void * pvParameter ) FREERTOS_SYSTEM_CALL;
+TaskHandle_t MPU_xTaskGetIdleTaskHandle( void ) FREERTOS_SYSTEM_CALL;
+UBaseType_t MPU_uxTaskGetSystemState( TaskStatus_t * const pxTaskStatusArray,
+                                      const UBaseType_t uxArraySize,
+                                      configRUN_TIME_COUNTER_TYPE * const pulTotalRunTime ) FREERTOS_SYSTEM_CALL;
+configRUN_TIME_COUNTER_TYPE MPU_ulTaskGetIdleRunTimeCounter( void ) FREERTOS_SYSTEM_CALL;
+configRUN_TIME_COUNTER_TYPE MPU_ulTaskGetIdleRunTimePercent( void ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskList( char * pcWriteBuffer ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskGetRunTimeStats( char * pcWriteBuffer ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTaskGenericNotify( TaskHandle_t xTaskToNotify,
+                                   UBaseType_t uxIndexToNotify,
+                                   uint32_t ulValue,
+                                   eNotifyAction eAction,
+                                   uint32_t * pulPreviousNotificationValue ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTaskGenericNotifyWait( UBaseType_t uxIndexToWaitOn,
+                                       uint32_t ulBitsToClearOnEntry,
+                                       uint32_t ulBitsToClearOnExit,
+                                       uint32_t * pulNotificationValue,
+                                       TickType_t xTicksToWait ) FREERTOS_SYSTEM_CALL;
+uint32_t MPU_ulTaskGenericNotifyTake( UBaseType_t uxIndexToWaitOn,
+                                      BaseType_t xClearCountOnExit,
+                                      TickType_t xTicksToWait ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTaskGenericNotifyStateClear( TaskHandle_t xTask,
+                                             UBaseType_t uxIndexToClear ) FREERTOS_SYSTEM_CALL;
+uint32_t MPU_ulTaskGenericNotifyValueClear( TaskHandle_t xTask,
+                                            UBaseType_t uxIndexToClear,
+                                            uint32_t ulBitsToClear ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTaskIncrementTick( void ) FREERTOS_SYSTEM_CALL;
+TaskHandle_t MPU_xTaskGetCurrentTaskHandle( void ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskSetTimeOutState( TimeOut_t * const pxTimeOut ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTaskCheckForTimeOut( TimeOut_t * const pxTimeOut,
+                                     TickType_t * const pxTicksToWait ) FREERTOS_SYSTEM_CALL;
+void MPU_vTaskMissedYield( void ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTaskGetSchedulerState( void ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTaskCatchUpTicks( TickType_t xTicksToCatchUp ) FREERTOS_SYSTEM_CALL;
+
+/* MPU versions of queue.h API functions. */
+BaseType_t MPU_xQueueGenericSend( QueueHandle_t xQueue,
+                                  const void * const pvItemToQueue,
+                                  TickType_t xTicksToWait,
+                                  const BaseType_t xCopyPosition ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xQueueReceive( QueueHandle_t xQueue,
+                              void * const pvBuffer,
+                              TickType_t xTicksToWait ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xQueuePeek( QueueHandle_t xQueue,
+                           void * const pvBuffer,
+                           TickType_t xTicksToWait ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xQueueSemaphoreTake( QueueHandle_t xQueue,
+                                    TickType_t xTicksToWait ) FREERTOS_SYSTEM_CALL;
+UBaseType_t MPU_uxQueueMessagesWaiting( const QueueHandle_t xQueue ) FREERTOS_SYSTEM_CALL;
+UBaseType_t MPU_uxQueueSpacesAvailable( const QueueHandle_t xQueue ) FREERTOS_SYSTEM_CALL;
+void MPU_vQueueDelete( QueueHandle_t xQueue ) FREERTOS_SYSTEM_CALL;
+QueueHandle_t MPU_xQueueCreateMutex( const uint8_t ucQueueType ) FREERTOS_SYSTEM_CALL;
+QueueHandle_t MPU_xQueueCreateMutexStatic( const uint8_t ucQueueType,
+                                           StaticQueue_t * pxStaticQueue ) FREERTOS_SYSTEM_CALL;
+QueueHandle_t MPU_xQueueCreateCountingSemaphore( const UBaseType_t uxMaxCount,
+                                                 const UBaseType_t uxInitialCount ) FREERTOS_SYSTEM_CALL;
+QueueHandle_t MPU_xQueueCreateCountingSemaphoreStatic( const UBaseType_t uxMaxCount,
+                                                       const UBaseType_t uxInitialCount,
+                                                       StaticQueue_t * pxStaticQueue ) FREERTOS_SYSTEM_CALL;
+TaskHandle_t MPU_xQueueGetMutexHolder( QueueHandle_t xSemaphore ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xQueueTakeMutexRecursive( QueueHandle_t xMutex,
+                                         TickType_t xTicksToWait ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xQueueGiveMutexRecursive( QueueHandle_t pxMutex ) FREERTOS_SYSTEM_CALL;
+void MPU_vQueueAddToRegistry( QueueHandle_t xQueue,
+                              const char * pcName ) FREERTOS_SYSTEM_CALL;
+void MPU_vQueueUnregisterQueue( QueueHandle_t xQueue ) FREERTOS_SYSTEM_CALL;
+const char * MPU_pcQueueGetName( QueueHandle_t xQueue ) FREERTOS_SYSTEM_CALL;
+QueueHandle_t MPU_xQueueGenericCreate( const UBaseType_t uxQueueLength,
+                                       const UBaseType_t uxItemSize,
+                                       const uint8_t ucQueueType ) FREERTOS_SYSTEM_CALL;
+QueueHandle_t MPU_xQueueGenericCreateStatic( const UBaseType_t uxQueueLength,
+                                             const UBaseType_t uxItemSize,
+                                             uint8_t * pucQueueStorage,
+                                             StaticQueue_t * pxStaticQueue,
+                                             const uint8_t ucQueueType ) FREERTOS_SYSTEM_CALL;
+QueueSetHandle_t MPU_xQueueCreateSet( const UBaseType_t uxEventQueueLength ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xQueueAddToSet( QueueSetMemberHandle_t xQueueOrSemaphore,
+                               QueueSetHandle_t xQueueSet ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xQueueRemoveFromSet( QueueSetMemberHandle_t xQueueOrSemaphore,
+                                    QueueSetHandle_t xQueueSet ) FREERTOS_SYSTEM_CALL;
+QueueSetMemberHandle_t MPU_xQueueSelectFromSet( QueueSetHandle_t xQueueSet,
+                                                const TickType_t xTicksToWait ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xQueueGenericReset( QueueHandle_t xQueue,
+                                   BaseType_t xNewQueue ) FREERTOS_SYSTEM_CALL;
+void MPU_vQueueSetQueueNumber( QueueHandle_t xQueue,
+                               UBaseType_t uxQueueNumber ) FREERTOS_SYSTEM_CALL;
+UBaseType_t MPU_uxQueueGetQueueNumber( QueueHandle_t xQueue ) FREERTOS_SYSTEM_CALL;
+uint8_t MPU_ucQueueGetQueueType( QueueHandle_t xQueue ) FREERTOS_SYSTEM_CALL;
+
+/* MPU versions of timers.h API functions. */
+TimerHandle_t MPU_xTimerCreate( const char * const pcTimerName,
+                                const TickType_t xTimerPeriodInTicks,
+                                const UBaseType_t uxAutoReload,
+                                void * const pvTimerID,
+                                TimerCallbackFunction_t pxCallbackFunction ) FREERTOS_SYSTEM_CALL;
+TimerHandle_t MPU_xTimerCreateStatic( const char * const pcTimerName,
+                                      const TickType_t xTimerPeriodInTicks,
+                                      const UBaseType_t uxAutoReload,
+                                      void * const pvTimerID,
+                                      TimerCallbackFunction_t pxCallbackFunction,
+                                      StaticTimer_t * pxTimerBuffer ) FREERTOS_SYSTEM_CALL;
+void * MPU_pvTimerGetTimerID( const TimerHandle_t xTimer ) FREERTOS_SYSTEM_CALL;
+void MPU_vTimerSetTimerID( TimerHandle_t xTimer,
+                           void * pvNewID ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTimerIsTimerActive( TimerHandle_t xTimer ) FREERTOS_SYSTEM_CALL;
+TaskHandle_t MPU_xTimerGetTimerDaemonTaskHandle( void ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTimerPendFunctionCall( PendedFunction_t xFunctionToPend,
+                                       void * pvParameter1,
+                                       uint32_t ulParameter2,
+                                       TickType_t xTicksToWait ) FREERTOS_SYSTEM_CALL;
+const char * MPU_pcTimerGetName( TimerHandle_t xTimer ) FREERTOS_SYSTEM_CALL;
+void MPU_vTimerSetReloadMode( TimerHandle_t xTimer,
+                              const UBaseType_t uxAutoReload ) FREERTOS_SYSTEM_CALL;
+UBaseType_t MPU_uxTimerGetReloadMode( TimerHandle_t xTimer ) FREERTOS_SYSTEM_CALL;
+TickType_t MPU_xTimerGetPeriod( TimerHandle_t xTimer ) FREERTOS_SYSTEM_CALL;
+TickType_t MPU_xTimerGetExpiryTime( TimerHandle_t xTimer ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTimerCreateTimerTask( void ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xTimerGenericCommand( TimerHandle_t xTimer,
+                                     const BaseType_t xCommandID,
+                                     const TickType_t xOptionalValue,
+                                     BaseType_t * const pxHigherPriorityTaskWoken,
+                                     const TickType_t xTicksToWait ) FREERTOS_SYSTEM_CALL;
+
+/* MPU versions of event_group.h API functions. */
+EventGroupHandle_t MPU_xEventGroupCreate( void ) FREERTOS_SYSTEM_CALL;
+EventGroupHandle_t MPU_xEventGroupCreateStatic( StaticEventGroup_t * pxEventGroupBuffer ) FREERTOS_SYSTEM_CALL;
+EventBits_t MPU_xEventGroupWaitBits( EventGroupHandle_t xEventGroup,
+                                     const EventBits_t uxBitsToWaitFor,
+                                     const BaseType_t xClearOnExit,
+                                     const BaseType_t xWaitForAllBits,
+                                     TickType_t xTicksToWait ) FREERTOS_SYSTEM_CALL;
+EventBits_t MPU_xEventGroupClearBits( EventGroupHandle_t xEventGroup,
+                                      const EventBits_t uxBitsToClear ) FREERTOS_SYSTEM_CALL;
+EventBits_t MPU_xEventGroupSetBits( EventGroupHandle_t xEventGroup,
+                                    const EventBits_t uxBitsToSet ) FREERTOS_SYSTEM_CALL;
+EventBits_t MPU_xEventGroupSync( EventGroupHandle_t xEventGroup,
+                                 const EventBits_t uxBitsToSet,
+                                 const EventBits_t uxBitsToWaitFor,
+                                 TickType_t xTicksToWait ) FREERTOS_SYSTEM_CALL;
+void MPU_vEventGroupDelete( EventGroupHandle_t xEventGroup ) FREERTOS_SYSTEM_CALL;
+UBaseType_t MPU_uxEventGroupGetNumber( void * xEventGroup ) FREERTOS_SYSTEM_CALL;
+
+/* MPU versions of message/stream_buffer.h API functions. */
+size_t MPU_xStreamBufferSend( StreamBufferHandle_t xStreamBuffer,
+                              const void * pvTxData,
+                              size_t xDataLengthBytes,
+                              TickType_t xTicksToWait ) FREERTOS_SYSTEM_CALL;
+size_t MPU_xStreamBufferReceive( StreamBufferHandle_t xStreamBuffer,
+                                 void * pvRxData,
+                                 size_t xBufferLengthBytes,
+                                 TickType_t xTicksToWait ) FREERTOS_SYSTEM_CALL;
+size_t MPU_xStreamBufferNextMessageLengthBytes( StreamBufferHandle_t xStreamBuffer ) FREERTOS_SYSTEM_CALL;
+void MPU_vStreamBufferDelete( StreamBufferHandle_t xStreamBuffer ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xStreamBufferIsFull( StreamBufferHandle_t xStreamBuffer ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xStreamBufferIsEmpty( StreamBufferHandle_t xStreamBuffer ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xStreamBufferReset( StreamBufferHandle_t xStreamBuffer ) FREERTOS_SYSTEM_CALL;
+size_t MPU_xStreamBufferSpacesAvailable( StreamBufferHandle_t xStreamBuffer ) FREERTOS_SYSTEM_CALL;
+size_t MPU_xStreamBufferBytesAvailable( StreamBufferHandle_t xStreamBuffer ) FREERTOS_SYSTEM_CALL;
+BaseType_t MPU_xStreamBufferSetTriggerLevel( StreamBufferHandle_t xStreamBuffer,
+                                             size_t xTriggerLevel ) FREERTOS_SYSTEM_CALL;
+StreamBufferHandle_t MPU_xStreamBufferGenericCreate( size_t xBufferSizeBytes,
+                                                     size_t xTriggerLevelBytes,
+                                                     BaseType_t xIsMessageBuffer ) FREERTOS_SYSTEM_CALL;
+StreamBufferHandle_t MPU_xStreamBufferGenericCreateStatic( size_t xBufferSizeBytes,
+                                                           size_t xTriggerLevelBytes,
+                                                           BaseType_t xIsMessageBuffer,
+                                                           uint8_t * const pucStreamBufferStorageArea,
+                                                           StaticStreamBuffer_t * const pxStaticStreamBuffer ) FREERTOS_SYSTEM_CALL;
+
+
+
+#endif /* MPU_PROTOTYPES_H */

freertos/Source/include/mpu_wrappers.h

@@ -0,0 +1,217 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef MPU_WRAPPERS_H
+#define MPU_WRAPPERS_H
+
+/* This file redefines API functions to be called through a wrapper macro, but
+ * only for ports that are using the MPU. */
+#if ( portUSING_MPU_WRAPPERS == 1 )
+
+/* MPU_WRAPPERS_INCLUDED_FROM_API_FILE will be defined when this file is
+ * included from queue.c or task.c to prevent it from having an effect within
+ * those files. */
+    #ifndef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+/*
+ * Map standard (non MPU) API functions to equivalents that start
+ * "MPU_".  This will cause the application code to call the MPU_
+ * version, which wraps the non-MPU version with privilege promoting
+ * then demoting code, so the kernel code always runs will full
+ * privileges.
+ */
+
+/* Map standard tasks.h API functions to the MPU equivalents. */
+        #define xTaskCreate                            MPU_xTaskCreate
+        #define xTaskCreateStatic                      MPU_xTaskCreateStatic
+        #define vTaskDelete                            MPU_vTaskDelete
+        #define vTaskDelay                             MPU_vTaskDelay
+        #define xTaskDelayUntil                        MPU_xTaskDelayUntil
+        #define xTaskAbortDelay                        MPU_xTaskAbortDelay
+        #define uxTaskPriorityGet                      MPU_uxTaskPriorityGet
+        #define eTaskGetState                          MPU_eTaskGetState
+        #define vTaskGetInfo                           MPU_vTaskGetInfo
+        #define vTaskPrioritySet                       MPU_vTaskPrioritySet
+        #define vTaskSuspend                           MPU_vTaskSuspend
+        #define vTaskResume                            MPU_vTaskResume
+        #define vTaskSuspendAll                        MPU_vTaskSuspendAll
+        #define xTaskResumeAll                         MPU_xTaskResumeAll
+        #define xTaskGetTickCount                      MPU_xTaskGetTickCount
+        #define uxTaskGetNumberOfTasks                 MPU_uxTaskGetNumberOfTasks
+        #define pcTaskGetName                          MPU_pcTaskGetName
+        #define xTaskGetHandle                         MPU_xTaskGetHandle
+        #define uxTaskGetStackHighWaterMark            MPU_uxTaskGetStackHighWaterMark
+        #define uxTaskGetStackHighWaterMark2           MPU_uxTaskGetStackHighWaterMark2
+        #define vTaskSetApplicationTaskTag             MPU_vTaskSetApplicationTaskTag
+        #define xTaskGetApplicationTaskTag             MPU_xTaskGetApplicationTaskTag
+        #define vTaskSetThreadLocalStoragePointer      MPU_vTaskSetThreadLocalStoragePointer
+        #define pvTaskGetThreadLocalStoragePointer     MPU_pvTaskGetThreadLocalStoragePointer
+        #define xTaskCallApplicationTaskHook           MPU_xTaskCallApplicationTaskHook
+        #define xTaskGetIdleTaskHandle                 MPU_xTaskGetIdleTaskHandle
+        #define uxTaskGetSystemState                   MPU_uxTaskGetSystemState
+        #define vTaskList                              MPU_vTaskList
+        #define vTaskGetRunTimeStats                   MPU_vTaskGetRunTimeStats
+        #define ulTaskGetIdleRunTimeCounter            MPU_ulTaskGetIdleRunTimeCounter
+        #define ulTaskGetIdleRunTimePercent            MPU_ulTaskGetIdleRunTimePercent
+        #define xTaskGenericNotify                     MPU_xTaskGenericNotify
+        #define xTaskGenericNotifyWait                 MPU_xTaskGenericNotifyWait
+        #define ulTaskGenericNotifyTake                MPU_ulTaskGenericNotifyTake
+        #define xTaskGenericNotifyStateClear           MPU_xTaskGenericNotifyStateClear
+        #define ulTaskGenericNotifyValueClear          MPU_ulTaskGenericNotifyValueClear
+        #define xTaskCatchUpTicks                      MPU_xTaskCatchUpTicks
+
+        #define xTaskGetCurrentTaskHandle              MPU_xTaskGetCurrentTaskHandle
+        #define vTaskSetTimeOutState                   MPU_vTaskSetTimeOutState
+        #define xTaskCheckForTimeOut                   MPU_xTaskCheckForTimeOut
+        #define xTaskGetSchedulerState                 MPU_xTaskGetSchedulerState
+
+/* Map standard queue.h API functions to the MPU equivalents. */
+        #define xQueueGenericSend                      MPU_xQueueGenericSend
+        #define xQueueReceive                          MPU_xQueueReceive
+        #define xQueuePeek                             MPU_xQueuePeek
+        #define xQueueSemaphoreTake                    MPU_xQueueSemaphoreTake
+        #define uxQueueMessagesWaiting                 MPU_uxQueueMessagesWaiting
+        #define uxQueueSpacesAvailable                 MPU_uxQueueSpacesAvailable
+        #define vQueueDelete                           MPU_vQueueDelete
+        #define xQueueCreateMutex                      MPU_xQueueCreateMutex
+        #define xQueueCreateMutexStatic                MPU_xQueueCreateMutexStatic
+        #define xQueueCreateCountingSemaphore          MPU_xQueueCreateCountingSemaphore
+        #define xQueueCreateCountingSemaphoreStatic    MPU_xQueueCreateCountingSemaphoreStatic
+        #define xQueueGetMutexHolder                   MPU_xQueueGetMutexHolder
+        #define xQueueTakeMutexRecursive               MPU_xQueueTakeMutexRecursive
+        #define xQueueGiveMutexRecursive               MPU_xQueueGiveMutexRecursive
+        #define xQueueGenericCreate                    MPU_xQueueGenericCreate
+        #define xQueueGenericCreateStatic              MPU_xQueueGenericCreateStatic
+        #define xQueueCreateSet                        MPU_xQueueCreateSet
+        #define xQueueAddToSet                         MPU_xQueueAddToSet
+        #define xQueueRemoveFromSet                    MPU_xQueueRemoveFromSet
+        #define xQueueSelectFromSet                    MPU_xQueueSelectFromSet
+        #define xQueueGenericReset                     MPU_xQueueGenericReset
+
+        #if ( configQUEUE_REGISTRY_SIZE > 0 )
+            #define vQueueAddToRegistry                MPU_vQueueAddToRegistry
+            #define vQueueUnregisterQueue              MPU_vQueueUnregisterQueue
+            #define pcQueueGetName                     MPU_pcQueueGetName
+        #endif
+
+/* Map standard timer.h API functions to the MPU equivalents. */
+        #define xTimerCreate                           MPU_xTimerCreate
+        #define xTimerCreateStatic                     MPU_xTimerCreateStatic
+        #define pvTimerGetTimerID                      MPU_pvTimerGetTimerID
+        #define vTimerSetTimerID                       MPU_vTimerSetTimerID
+        #define xTimerIsTimerActive                    MPU_xTimerIsTimerActive
+        #define xTimerGetTimerDaemonTaskHandle         MPU_xTimerGetTimerDaemonTaskHandle
+        #define xTimerPendFunctionCall                 MPU_xTimerPendFunctionCall
+        #define pcTimerGetName                         MPU_pcTimerGetName
+        #define vTimerSetReloadMode                    MPU_vTimerSetReloadMode
+        #define uxTimerGetReloadMode                   MPU_uxTimerGetReloadMode
+        #define xTimerGetPeriod                        MPU_xTimerGetPeriod
+        #define xTimerGetExpiryTime                    MPU_xTimerGetExpiryTime
+        #define xTimerGenericCommand                   MPU_xTimerGenericCommand
+
+/* Map standard event_group.h API functions to the MPU equivalents. */
+        #define xEventGroupCreate                      MPU_xEventGroupCreate
+        #define xEventGroupCreateStatic                MPU_xEventGroupCreateStatic
+        #define xEventGroupWaitBits                    MPU_xEventGroupWaitBits
+        #define xEventGroupClearBits                   MPU_xEventGroupClearBits
+        #define xEventGroupSetBits                     MPU_xEventGroupSetBits
+        #define xEventGroupSync                        MPU_xEventGroupSync
+        #define vEventGroupDelete                      MPU_vEventGroupDelete
+
+/* Map standard message/stream_buffer.h API functions to the MPU
+ * equivalents. */
+        #define xStreamBufferSend                      MPU_xStreamBufferSend
+        #define xStreamBufferReceive                   MPU_xStreamBufferReceive
+        #define xStreamBufferNextMessageLengthBytes    MPU_xStreamBufferNextMessageLengthBytes
+        #define vStreamBufferDelete                    MPU_vStreamBufferDelete
+        #define xStreamBufferIsFull                    MPU_xStreamBufferIsFull
+        #define xStreamBufferIsEmpty                   MPU_xStreamBufferIsEmpty
+        #define xStreamBufferReset                     MPU_xStreamBufferReset
+        #define xStreamBufferSpacesAvailable           MPU_xStreamBufferSpacesAvailable
+        #define xStreamBufferBytesAvailable            MPU_xStreamBufferBytesAvailable
+        #define xStreamBufferSetTriggerLevel           MPU_xStreamBufferSetTriggerLevel
+        #define xStreamBufferGenericCreate             MPU_xStreamBufferGenericCreate
+        #define xStreamBufferGenericCreateStatic       MPU_xStreamBufferGenericCreateStatic
+
+
+/* Remove the privileged function macro, but keep the PRIVILEGED_DATA
+ * macro so applications can place data in privileged access sections
+ * (useful when using statically allocated objects). */
+        #define PRIVILEGED_FUNCTION
+        #define PRIVILEGED_DATA    __attribute__( ( section( "privileged_data" ) ) )
+        #define FREERTOS_SYSTEM_CALL
+
+    #else /* MPU_WRAPPERS_INCLUDED_FROM_API_FILE */
+
+        /* Ensure API functions go in the privileged execution section. */
+        #define PRIVILEGED_FUNCTION     __attribute__( ( section( "privileged_functions" ) ) )
+        #define PRIVILEGED_DATA         __attribute__( ( section( "privileged_data" ) ) )
+        #define FREERTOS_SYSTEM_CALL    __attribute__( ( section( "freertos_system_calls" ) ) )
+
+        /**
+         * @brief Calls the port specific code to raise the privilege.
+         *
+         * Sets xRunningPrivileged to pdFALSE if privilege was raised, else sets
+         * it to pdTRUE.
+         */
+        #define xPortRaisePrivilege( xRunningPrivileged )                      \
+        {                                                                      \
+            /* Check whether the processor is already privileged. */           \
+            xRunningPrivileged = portIS_PRIVILEGED();                          \
+                                                                               \
+            /* If the processor is not already privileged, raise privilege. */ \
+            if( xRunningPrivileged == pdFALSE )                                \
+            {                                                                  \
+                portRAISE_PRIVILEGE();                                         \
+            }                                                                  \
+        }
+
+        /**
+         * @brief If xRunningPrivileged is not pdTRUE, calls the port specific
+         * code to reset the privilege, otherwise does nothing.
+         */
+        #define vPortResetPrivilege( xRunningPrivileged )   \
+        {                                                   \
+            if( xRunningPrivileged == pdFALSE )             \
+            {                                               \
+                portRESET_PRIVILEGE();                      \
+            }                                               \
+        }
+
+    #endif /* MPU_WRAPPERS_INCLUDED_FROM_API_FILE */
+
+#else /* portUSING_MPU_WRAPPERS */
+
+    #define PRIVILEGED_FUNCTION
+    #define PRIVILEGED_DATA
+    #define FREERTOS_SYSTEM_CALL
+
+#endif /* portUSING_MPU_WRAPPERS */
+
+
+#endif /* MPU_WRAPPERS_H */

freertos/Source/include/portable.h

@@ -0,0 +1,223 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+/*-----------------------------------------------------------
+* Portable layer API.  Each function must be defined for each port.
+*----------------------------------------------------------*/
+
+#ifndef PORTABLE_H
+#define PORTABLE_H
+
+/* Each FreeRTOS port has a unique portmacro.h header file.  Originally a
+ * pre-processor definition was used to ensure the pre-processor found the correct
+ * portmacro.h file for the port being used.  That scheme was deprecated in favour
+ * of setting the compiler's include path such that it found the correct
+ * portmacro.h file - removing the need for the constant and allowing the
+ * portmacro.h file to be located anywhere in relation to the port being used.
+ * Purely for reasons of backward compatibility the old method is still valid, but
+ * to make it clear that new projects should not use it, support for the port
+ * specific constants has been moved into the deprecated_definitions.h header
+ * file. */
+#include "deprecated_definitions.h"
+
+/* If portENTER_CRITICAL is not defined then including deprecated_definitions.h
+ * did not result in a portmacro.h header file being included - and it should be
+ * included here.  In this case the path to the correct portmacro.h header file
+ * must be set in the compiler's include path. */
+#ifndef portENTER_CRITICAL
+    #include "portmacro.h"
+#endif
+
+#if portBYTE_ALIGNMENT == 32
+    #define portBYTE_ALIGNMENT_MASK    ( 0x001f )
+#elif portBYTE_ALIGNMENT == 16
+    #define portBYTE_ALIGNMENT_MASK    ( 0x000f )
+#elif portBYTE_ALIGNMENT == 8
+    #define portBYTE_ALIGNMENT_MASK    ( 0x0007 )
+#elif portBYTE_ALIGNMENT == 4
+    #define portBYTE_ALIGNMENT_MASK    ( 0x0003 )
+#elif portBYTE_ALIGNMENT == 2
+    #define portBYTE_ALIGNMENT_MASK    ( 0x0001 )
+#elif portBYTE_ALIGNMENT == 1
+    #define portBYTE_ALIGNMENT_MASK    ( 0x0000 )
+#else /* if portBYTE_ALIGNMENT == 32 */
+    #error "Invalid portBYTE_ALIGNMENT definition"
+#endif /* if portBYTE_ALIGNMENT == 32 */
+
+#ifndef portUSING_MPU_WRAPPERS
+    #define portUSING_MPU_WRAPPERS    0
+#endif
+
+#ifndef portNUM_CONFIGURABLE_REGIONS
+    #define portNUM_CONFIGURABLE_REGIONS    1
+#endif
+
+#ifndef portHAS_STACK_OVERFLOW_CHECKING
+    #define portHAS_STACK_OVERFLOW_CHECKING    0
+#endif
+
+#ifndef portARCH_NAME
+    #define portARCH_NAME    NULL
+#endif
+
+#ifndef configSTACK_ALLOCATION_FROM_SEPARATE_HEAP
+    /* Defaults to 0 for backward compatibility. */
+    #define configSTACK_ALLOCATION_FROM_SEPARATE_HEAP    0
+#endif
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+    extern "C" {
+#endif
+/* *INDENT-ON* */
+
+#include "mpu_wrappers.h"
+
+/*
+ * Setup the stack of a new task so it is ready to be placed under the
+ * scheduler control.  The registers have to be placed on the stack in
+ * the order that the port expects to find them.
+ *
+ */
+#if ( portUSING_MPU_WRAPPERS == 1 )
+    #if ( portHAS_STACK_OVERFLOW_CHECKING == 1 )
+        StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
+                                             StackType_t * pxEndOfStack,
+                                             TaskFunction_t pxCode,
+                                             void * pvParameters,
+                                             BaseType_t xRunPrivileged ) PRIVILEGED_FUNCTION;
+    #else
+        StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
+                                             TaskFunction_t pxCode,
+                                             void * pvParameters,
+                                             BaseType_t xRunPrivileged ) PRIVILEGED_FUNCTION;
+    #endif
+#else /* if ( portUSING_MPU_WRAPPERS == 1 ) */
+    #if ( portHAS_STACK_OVERFLOW_CHECKING == 1 )
+        StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
+                                             StackType_t * pxEndOfStack,
+                                             TaskFunction_t pxCode,
+                                             void * pvParameters ) PRIVILEGED_FUNCTION;
+    #else
+        StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
+                                             TaskFunction_t pxCode,
+                                             void * pvParameters ) PRIVILEGED_FUNCTION;
+    #endif
+#endif /* if ( portUSING_MPU_WRAPPERS == 1 ) */
+
+/* Used by heap_5.c to define the start address and size of each memory region
+ * that together comprise the total FreeRTOS heap space. */
+typedef struct HeapRegion
+{
+    uint8_t * pucStartAddress;
+    size_t xSizeInBytes;
+} HeapRegion_t;
+
+/* Used to pass information about the heap out of vPortGetHeapStats(). */
+typedef struct xHeapStats
+{
+    size_t xAvailableHeapSpaceInBytes;      /* The total heap size currently available - this is the sum of all the free blocks, not the largest block that can be allocated. */
+    size_t xSizeOfLargestFreeBlockInBytes;  /* The maximum size, in bytes, of all the free blocks within the heap at the time vPortGetHeapStats() is called. */
+    size_t xSizeOfSmallestFreeBlockInBytes; /* The minimum size, in bytes, of all the free blocks within the heap at the time vPortGetHeapStats() is called. */
+    size_t xNumberOfFreeBlocks;             /* The number of free memory blocks within the heap at the time vPortGetHeapStats() is called. */
+    size_t xMinimumEverFreeBytesRemaining;  /* The minimum amount of total free memory (sum of all free blocks) there has been in the heap since the system booted. */
+    size_t xNumberOfSuccessfulAllocations;  /* The number of calls to pvPortMalloc() that have returned a valid memory block. */
+    size_t xNumberOfSuccessfulFrees;        /* The number of calls to vPortFree() that has successfully freed a block of memory. */
+} HeapStats_t;
+
+/*
+ * Used to define multiple heap regions for use by heap_5.c.  This function
+ * must be called before any calls to pvPortMalloc() - not creating a task,
+ * queue, semaphore, mutex, software timer, event group, etc. will result in
+ * pvPortMalloc being called.
+ *
+ * pxHeapRegions passes in an array of HeapRegion_t structures - each of which
+ * defines a region of memory that can be used as the heap.  The array is
+ * terminated by a HeapRegions_t structure that has a size of 0.  The region
+ * with the lowest start address must appear first in the array.
+ */
+void vPortDefineHeapRegions( const HeapRegion_t * const pxHeapRegions ) PRIVILEGED_FUNCTION;
+
+/*
+ * Returns a HeapStats_t structure filled with information about the current
+ * heap state.
+ */
+void vPortGetHeapStats( HeapStats_t * pxHeapStats );
+
+/*
+ * Map to the memory management routines required for the port.
+ */
+void * pvPortMalloc( size_t xSize ) PRIVILEGED_FUNCTION;
+void vPortFree( void * pv ) PRIVILEGED_FUNCTION;
+void vPortInitialiseBlocks( void ) PRIVILEGED_FUNCTION;
+size_t xPortGetFreeHeapSize( void ) PRIVILEGED_FUNCTION;
+size_t xPortGetMinimumEverFreeHeapSize( void ) PRIVILEGED_FUNCTION;
+
+#if ( configSTACK_ALLOCATION_FROM_SEPARATE_HEAP == 1 )
+    void * pvPortMallocStack( size_t xSize ) PRIVILEGED_FUNCTION;
+    void vPortFreeStack( void * pv ) PRIVILEGED_FUNCTION;
+#else
+    #define pvPortMallocStack    pvPortMalloc
+    #define vPortFreeStack       vPortFree
+#endif
+
+/*
+ * Setup the hardware ready for the scheduler to take control.  This generally
+ * sets up a tick interrupt and sets timers for the correct tick frequency.
+ */
+BaseType_t xPortStartScheduler( void ) PRIVILEGED_FUNCTION;
+
+/*
+ * Undo any hardware/ISR setup that was performed by xPortStartScheduler() so
+ * the hardware is left in its original condition after the scheduler stops
+ * executing.
+ */
+void vPortEndScheduler( void ) PRIVILEGED_FUNCTION;
+
+/*
+ * The structures and methods of manipulating the MPU are contained within the
+ * port layer.
+ *
+ * Fills the xMPUSettings structure with the memory region information
+ * contained in xRegions.
+ */
+#if ( portUSING_MPU_WRAPPERS == 1 )
+    struct xMEMORY_REGION;
+    void vPortStoreTaskMPUSettings( xMPU_SETTINGS * xMPUSettings,
+                                    const struct xMEMORY_REGION * const xRegions,
+                                    StackType_t * pxBottomOfStack,
+                                    uint32_t ulStackDepth ) PRIVILEGED_FUNCTION;
+#endif
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+    }
+#endif
+/* *INDENT-ON* */
+
+#endif /* PORTABLE_H */

freertos/Source/include/projdefs.h

@@ -0,0 +1,122 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef PROJDEFS_H
+#define PROJDEFS_H
+
+/*
+ * Defines the prototype to which task functions must conform.  Defined in this
+ * file to ensure the type is known before portable.h is included.
+ */
+typedef void (* TaskFunction_t)( void * );
+
+/* Converts a time in milliseconds to a time in ticks.  This macro can be
+ * overridden by a macro of the same name defined in FreeRTOSConfig.h in case the
+ * definition here is not suitable for your application. */
+#ifndef pdMS_TO_TICKS
+    #define pdMS_TO_TICKS( xTimeInMs )    ( ( TickType_t ) ( ( ( TickType_t ) ( xTimeInMs ) * ( TickType_t ) configTICK_RATE_HZ ) / ( TickType_t ) 1000U ) )
+#endif
+
+#define pdFALSE                                  ( ( BaseType_t ) 0 )
+#define pdTRUE                                   ( ( BaseType_t ) 1 )
+
+#define pdPASS                                   ( pdTRUE )
+#define pdFAIL                                   ( pdFALSE )
+#define errQUEUE_EMPTY                           ( ( BaseType_t ) 0 )
+#define errQUEUE_FULL                            ( ( BaseType_t ) 0 )
+
+/* FreeRTOS error definitions. */
+#define errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY    ( -1 )
+#define errQUEUE_BLOCKED                         ( -4 )
+#define errQUEUE_YIELD                           ( -5 )
+
+/* Macros used for basic data corruption checks. */
+#ifndef configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES
+    #define configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES    0
+#endif
+
+#if ( configUSE_16_BIT_TICKS == 1 )
+    #define pdINTEGRITY_CHECK_VALUE    0x5a5a
+#else
+    #define pdINTEGRITY_CHECK_VALUE    0x5a5a5a5aUL
+#endif
+
+/* The following errno values are used by FreeRTOS+ components, not FreeRTOS
+ * itself. */
+#define pdFREERTOS_ERRNO_NONE             0   /* No errors */
+#define pdFREERTOS_ERRNO_ENOENT           2   /* No such file or directory */
+#define pdFREERTOS_ERRNO_EINTR            4   /* Interrupted system call */
+#define pdFREERTOS_ERRNO_EIO              5   /* I/O error */
+#define pdFREERTOS_ERRNO_ENXIO            6   /* No such device or address */
+#define pdFREERTOS_ERRNO_EBADF            9   /* Bad file number */
+#define pdFREERTOS_ERRNO_EAGAIN           11  /* No more processes */
+#define pdFREERTOS_ERRNO_EWOULDBLOCK      11  /* Operation would block */
+#define pdFREERTOS_ERRNO_ENOMEM           12  /* Not enough memory */
+#define pdFREERTOS_ERRNO_EACCES           13  /* Permission denied */
+#define pdFREERTOS_ERRNO_EFAULT           14  /* Bad address */
+#define pdFREERTOS_ERRNO_EBUSY            16  /* Mount device busy */
+#define pdFREERTOS_ERRNO_EEXIST           17  /* File exists */
+#define pdFREERTOS_ERRNO_EXDEV            18  /* Cross-device link */
+#define pdFREERTOS_ERRNO_ENODEV           19  /* No such device */
+#define pdFREERTOS_ERRNO_ENOTDIR          20  /* Not a directory */
+#define pdFREERTOS_ERRNO_EISDIR           21  /* Is a directory */
+#define pdFREERTOS_ERRNO_EINVAL           22  /* Invalid argument */
+#define pdFREERTOS_ERRNO_ENOSPC           28  /* No space left on device */
+#define pdFREERTOS_ERRNO_ESPIPE           29  /* Illegal seek */
+#define pdFREERTOS_ERRNO_EROFS            30  /* Read only file system */
+#define pdFREERTOS_ERRNO_EUNATCH          42  /* Protocol driver not attached */
+#define pdFREERTOS_ERRNO_EBADE            50  /* Invalid exchange */
+#define pdFREERTOS_ERRNO_EFTYPE           79  /* Inappropriate file type or format */
+#define pdFREERTOS_ERRNO_ENMFILE          89  /* No more files */
+#define pdFREERTOS_ERRNO_ENOTEMPTY        90  /* Directory not empty */
+#define pdFREERTOS_ERRNO_ENAMETOOLONG     91  /* File or path name too long */
+#define pdFREERTOS_ERRNO_EOPNOTSUPP       95  /* Operation not supported on transport endpoint */
+#define pdFREERTOS_ERRNO_ENOBUFS          105 /* No buffer space available */
+#define pdFREERTOS_ERRNO_ENOPROTOOPT      109 /* Protocol not available */
+#define pdFREERTOS_ERRNO_EADDRINUSE       112 /* Address already in use */
+#define pdFREERTOS_ERRNO_ETIMEDOUT        116 /* Connection timed out */
+#define pdFREERTOS_ERRNO_EINPROGRESS      119 /* Connection already in progress */
+#define pdFREERTOS_ERRNO_EALREADY         120 /* Socket already connected */
+#define pdFREERTOS_ERRNO_EADDRNOTAVAIL    125 /* Address not available */
+#define pdFREERTOS_ERRNO_EISCONN          127 /* Socket is already connected */
+#define pdFREERTOS_ERRNO_ENOTCONN         128 /* Socket is not connected */
+#define pdFREERTOS_ERRNO_ENOMEDIUM        135 /* No medium inserted */
+#define pdFREERTOS_ERRNO_EILSEQ           138 /* An invalid UTF-16 sequence was encountered. */
+#define pdFREERTOS_ERRNO_ECANCELED        140 /* Operation canceled. */
+
+/* The following endian values are used by FreeRTOS+ components, not FreeRTOS
+ * itself. */
+#define pdFREERTOS_LITTLE_ENDIAN          0
+#define pdFREERTOS_BIG_ENDIAN             1
+
+/* Re-defining endian values for generic naming. */
+#define pdLITTLE_ENDIAN                   pdFREERTOS_LITTLE_ENDIAN
+#define pdBIG_ENDIAN                      pdFREERTOS_BIG_ENDIAN
+
+
+#endif /* PROJDEFS_H */

freertos/Source/include/stack_macros.h

@@ -0,0 +1,137 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef STACK_MACROS_H
+#define STACK_MACROS_H
+
+/*
+ * Call the stack overflow hook function if the stack of the task being swapped
+ * out is currently overflowed, or looks like it might have overflowed in the
+ * past.
+ *
+ * Setting configCHECK_FOR_STACK_OVERFLOW to 1 will cause the macro to check
+ * the current stack state only - comparing the current top of stack value to
+ * the stack limit.  Setting configCHECK_FOR_STACK_OVERFLOW to greater than 1
+ * will also cause the last few stack bytes to be checked to ensure the value
+ * to which the bytes were set when the task was created have not been
+ * overwritten.  Note this second test does not guarantee that an overflowed
+ * stack will always be recognised.
+ */
+
+/*-----------------------------------------------------------*/
+
+/*
+ * portSTACK_LIMIT_PADDING is a number of extra words to consider to be in
+ * use on the stack.
+ */
+#ifndef portSTACK_LIMIT_PADDING
+    #define portSTACK_LIMIT_PADDING    0
+#endif
+
+#if ( ( configCHECK_FOR_STACK_OVERFLOW == 1 ) && ( portSTACK_GROWTH < 0 ) )
+
+/* Only the current stack state is to be checked. */
+    #define taskCHECK_FOR_STACK_OVERFLOW()                                                            \
+    {                                                                                                 \
+        /* Is the currently saved stack pointer within the stack limit? */                            \
+        if( pxCurrentTCB->pxTopOfStack <= pxCurrentTCB->pxStack + portSTACK_LIMIT_PADDING )           \
+        {                                                                                             \
+            vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
+        }                                                                                             \
+    }
+
+#endif /* configCHECK_FOR_STACK_OVERFLOW == 1 */
+/*-----------------------------------------------------------*/
+
+#if ( ( configCHECK_FOR_STACK_OVERFLOW == 1 ) && ( portSTACK_GROWTH > 0 ) )
+
+/* Only the current stack state is to be checked. */
+    #define taskCHECK_FOR_STACK_OVERFLOW()                                                            \
+    {                                                                                                 \
+                                                                                                      \
+        /* Is the currently saved stack pointer within the stack limit? */                            \
+        if( pxCurrentTCB->pxTopOfStack >= pxCurrentTCB->pxEndOfStack - portSTACK_LIMIT_PADDING )      \
+        {                                                                                             \
+            vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
+        }                                                                                             \
+    }
+
+#endif /* configCHECK_FOR_STACK_OVERFLOW == 1 */
+/*-----------------------------------------------------------*/
+
+#if ( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH < 0 ) )
+
+    #define taskCHECK_FOR_STACK_OVERFLOW()                                                            \
+    {                                                                                                 \
+        const uint32_t * const pulStack = ( uint32_t * ) pxCurrentTCB->pxStack;                       \
+        const uint32_t ulCheckValue = ( uint32_t ) 0xa5a5a5a5;                                        \
+                                                                                                      \
+        if( ( pulStack[ 0 ] != ulCheckValue ) ||                                                      \
+            ( pulStack[ 1 ] != ulCheckValue ) ||                                                      \
+            ( pulStack[ 2 ] != ulCheckValue ) ||                                                      \
+            ( pulStack[ 3 ] != ulCheckValue ) )                                                       \
+        {                                                                                             \
+            vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName ); \
+        }                                                                                             \
+    }
+
+#endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */
+/*-----------------------------------------------------------*/
+
+#if ( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) && ( portSTACK_GROWTH > 0 ) )
+
+    #define taskCHECK_FOR_STACK_OVERFLOW()                                                                                                \
+    {                                                                                                                                     \
+        int8_t * pcEndOfStack = ( int8_t * ) pxCurrentTCB->pxEndOfStack;                                                                  \
+        static const uint8_t ucExpectedStackBytes[] = { tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,   \
+                                                        tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,   \
+                                                        tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,   \
+                                                        tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE,   \
+                                                        tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE, tskSTACK_FILL_BYTE }; \
+                                                                                                                                          \
+                                                                                                                                          \
+        pcEndOfStack -= sizeof( ucExpectedStackBytes );                                                                                   \
+                                                                                                                                          \
+        /* Has the extremity of the task stack ever been written over? */                                                                 \
+        if( memcmp( ( void * ) pcEndOfStack, ( void * ) ucExpectedStackBytes, sizeof( ucExpectedStackBytes ) ) != 0 )                     \
+        {                                                                                                                                 \
+            vApplicationStackOverflowHook( ( TaskHandle_t ) pxCurrentTCB, pxCurrentTCB->pcTaskName );                                     \
+        }                                                                                                                                 \
+    }
+
+#endif /* #if( configCHECK_FOR_STACK_OVERFLOW > 1 ) */
+/*-----------------------------------------------------------*/
+
+/* Remove stack overflow macro if not being used. */
+#ifndef taskCHECK_FOR_STACK_OVERFLOW
+    #define taskCHECK_FOR_STACK_OVERFLOW()
+#endif
+
+
+
+#endif /* STACK_MACROS_H */

freertos/Source/include/stdint.readme

@@ -0,0 +1,58 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef FREERTOS_STDINT
+#define FREERTOS_STDINT
+
+/*******************************************************************************
+ * THIS IS NOT A FULL stdint.h IMPLEMENTATION - It only contains the definitions
+ * necessary to build the FreeRTOS code.  It is provided to allow FreeRTOS to be
+ * built using compilers that do not provide their own stdint.h definition.
+ *
+ * To use this file:
+ *
+ *    1) Copy this file into the directory that contains your FreeRTOSConfig.h
+ *       header file, as that directory will already be in the compiler's include
+ *       path.
+ *
+ *    2) Rename the copied file stdint.h.
+ *
+ */
+
+typedef signed char int8_t;
+typedef unsigned char uint8_t;
+typedef short int16_t;
+typedef unsigned short uint16_t;
+typedef long int32_t;
+typedef unsigned long uint32_t;
+
+#ifndef SIZE_MAX
+    #define SIZE_MAX    ( ( size_t ) -1 )
+#endif
+
+#endif /* FREERTOS_STDINT */

freertos/Source/include/stream_buffer.h

@@ -0,0 +1,869 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+/*
+ * Stream buffers are used to send a continuous stream of data from one task or
+ * interrupt to another.  Their implementation is light weight, making them
+ * particularly suited for interrupt to task and core to core communication
+ * scenarios.
+ *
+ * ***NOTE***:  Uniquely among FreeRTOS objects, the stream buffer
+ * implementation (so also the message buffer implementation, as message buffers
+ * are built on top of stream buffers) assumes there is only one task or
+ * interrupt that will write to the buffer (the writer), and only one task or
+ * interrupt that will read from the buffer (the reader).  It is safe for the
+ * writer and reader to be different tasks or interrupts, but, unlike other
+ * FreeRTOS objects, it is not safe to have multiple different writers or
+ * multiple different readers.  If there are to be multiple different writers
+ * then the application writer must place each call to a writing API function
+ * (such as xStreamBufferSend()) inside a critical section and set the send
+ * block time to 0.  Likewise, if there are to be multiple different readers
+ * then the application writer must place each call to a reading API function
+ * (such as xStreamBufferReceive()) inside a critical section section and set the
+ * receive block time to 0.
+ *
+ */
+
+#ifndef STREAM_BUFFER_H
+#define STREAM_BUFFER_H
+
+#ifndef INC_FREERTOS_H
+    #error "include FreeRTOS.h must appear in source files before include stream_buffer.h"
+#endif
+
+/* *INDENT-OFF* */
+#if defined( __cplusplus )
+    extern "C" {
+#endif
+/* *INDENT-ON* */
+
+/**
+ * Type by which stream buffers are referenced.  For example, a call to
+ * xStreamBufferCreate() returns an StreamBufferHandle_t variable that can
+ * then be used as a parameter to xStreamBufferSend(), xStreamBufferReceive(),
+ * etc.
+ */
+struct StreamBufferDef_t;
+typedef struct StreamBufferDef_t * StreamBufferHandle_t;
+
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * StreamBufferHandle_t xStreamBufferCreate( size_t xBufferSizeBytes, size_t xTriggerLevelBytes );
+ * @endcode
+ *
+ * Creates a new stream buffer using dynamically allocated memory.  See
+ * xStreamBufferCreateStatic() for a version that uses statically allocated
+ * memory (memory that is allocated at compile time).
+ *
+ * configSUPPORT_DYNAMIC_ALLOCATION must be set to 1 or left undefined in
+ * FreeRTOSConfig.h for xStreamBufferCreate() to be available.
+ *
+ * @param xBufferSizeBytes The total number of bytes the stream buffer will be
+ * able to hold at any one time.
+ *
+ * @param xTriggerLevelBytes The number of bytes that must be in the stream
+ * buffer before a task that is blocked on the stream buffer to wait for data is
+ * moved out of the blocked state.  For example, if a task is blocked on a read
+ * of an empty stream buffer that has a trigger level of 1 then the task will be
+ * unblocked when a single byte is written to the buffer or the task's block
+ * time expires.  As another example, if a task is blocked on a read of an empty
+ * stream buffer that has a trigger level of 10 then the task will not be
+ * unblocked until the stream buffer contains at least 10 bytes or the task's
+ * block time expires.  If a reading task's block time expires before the
+ * trigger level is reached then the task will still receive however many bytes
+ * are actually available.  Setting a trigger level of 0 will result in a
+ * trigger level of 1 being used.  It is not valid to specify a trigger level
+ * that is greater than the buffer size.
+ *
+ * @return If NULL is returned, then the stream buffer cannot be created
+ * because there is insufficient heap memory available for FreeRTOS to allocate
+ * the stream buffer data structures and storage area.  A non-NULL value being
+ * returned indicates that the stream buffer has been created successfully -
+ * the returned value should be stored as the handle to the created stream
+ * buffer.
+ *
+ * Example use:
+ * @code{c}
+ *
+ * void vAFunction( void )
+ * {
+ * StreamBufferHandle_t xStreamBuffer;
+ * const size_t xStreamBufferSizeBytes = 100, xTriggerLevel = 10;
+ *
+ *  // Create a stream buffer that can hold 100 bytes.  The memory used to hold
+ *  // both the stream buffer structure and the data in the stream buffer is
+ *  // allocated dynamically.
+ *  xStreamBuffer = xStreamBufferCreate( xStreamBufferSizeBytes, xTriggerLevel );
+ *
+ *  if( xStreamBuffer == NULL )
+ *  {
+ *      // There was not enough heap memory space available to create the
+ *      // stream buffer.
+ *  }
+ *  else
+ *  {
+ *      // The stream buffer was created successfully and can now be used.
+ *  }
+ * }
+ * @endcode
+ * \defgroup xStreamBufferCreate xStreamBufferCreate
+ * \ingroup StreamBufferManagement
+ */
+#define xStreamBufferCreate( xBufferSizeBytes, xTriggerLevelBytes )    xStreamBufferGenericCreate( xBufferSizeBytes, xTriggerLevelBytes, pdFALSE )
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * StreamBufferHandle_t xStreamBufferCreateStatic( size_t xBufferSizeBytes,
+ *                                              size_t xTriggerLevelBytes,
+ *                                              uint8_t *pucStreamBufferStorageArea,
+ *                                              StaticStreamBuffer_t *pxStaticStreamBuffer );
+ * @endcode
+ * Creates a new stream buffer using statically allocated memory.  See
+ * xStreamBufferCreate() for a version that uses dynamically allocated memory.
+ *
+ * configSUPPORT_STATIC_ALLOCATION must be set to 1 in FreeRTOSConfig.h for
+ * xStreamBufferCreateStatic() to be available.
+ *
+ * @param xBufferSizeBytes The size, in bytes, of the buffer pointed to by the
+ * pucStreamBufferStorageArea parameter.
+ *
+ * @param xTriggerLevelBytes The number of bytes that must be in the stream
+ * buffer before a task that is blocked on the stream buffer to wait for data is
+ * moved out of the blocked state.  For example, if a task is blocked on a read
+ * of an empty stream buffer that has a trigger level of 1 then the task will be
+ * unblocked when a single byte is written to the buffer or the task's block
+ * time expires.  As another example, if a task is blocked on a read of an empty
+ * stream buffer that has a trigger level of 10 then the task will not be
+ * unblocked until the stream buffer contains at least 10 bytes or the task's
+ * block time expires.  If a reading task's block time expires before the
+ * trigger level is reached then the task will still receive however many bytes
+ * are actually available.  Setting a trigger level of 0 will result in a
+ * trigger level of 1 being used.  It is not valid to specify a trigger level
+ * that is greater than the buffer size.
+ *
+ * @param pucStreamBufferStorageArea Must point to a uint8_t array that is at
+ * least xBufferSizeBytes big.  This is the array to which streams are
+ * copied when they are written to the stream buffer.
+ *
+ * @param pxStaticStreamBuffer Must point to a variable of type
+ * StaticStreamBuffer_t, which will be used to hold the stream buffer's data
+ * structure.
+ *
+ * @return If the stream buffer is created successfully then a handle to the
+ * created stream buffer is returned. If either pucStreamBufferStorageArea or
+ * pxStaticstreamBuffer are NULL then NULL is returned.
+ *
+ * Example use:
+ * @code{c}
+ *
+ * // Used to dimension the array used to hold the streams.  The available space
+ * // will actually be one less than this, so 999.
+ #define STORAGE_SIZE_BYTES 1000
+ *
+ * // Defines the memory that will actually hold the streams within the stream
+ * // buffer.
+ * static uint8_t ucStorageBuffer[ STORAGE_SIZE_BYTES ];
+ *
+ * // The variable used to hold the stream buffer structure.
+ * StaticStreamBuffer_t xStreamBufferStruct;
+ *
+ * void MyFunction( void )
+ * {
+ * StreamBufferHandle_t xStreamBuffer;
+ * const size_t xTriggerLevel = 1;
+ *
+ *  xStreamBuffer = xStreamBufferCreateStatic( sizeof( ucStorageBuffer ),
+ *                                             xTriggerLevel,
+ *                                             ucStorageBuffer,
+ *                                             &xStreamBufferStruct );
+ *
+ *  // As neither the pucStreamBufferStorageArea or pxStaticStreamBuffer
+ *  // parameters were NULL, xStreamBuffer will not be NULL, and can be used to
+ *  // reference the created stream buffer in other stream buffer API calls.
+ *
+ *  // Other code that uses the stream buffer can go here.
+ * }
+ *
+ * @endcode
+ * \defgroup xStreamBufferCreateStatic xStreamBufferCreateStatic
+ * \ingroup StreamBufferManagement
+ */
+#define xStreamBufferCreateStatic( xBufferSizeBytes, xTriggerLevelBytes, pucStreamBufferStorageArea, pxStaticStreamBuffer ) \
+    xStreamBufferGenericCreateStatic( xBufferSizeBytes, xTriggerLevelBytes, pdFALSE, pucStreamBufferStorageArea, pxStaticStreamBuffer )
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * size_t xStreamBufferSend( StreamBufferHandle_t xStreamBuffer,
+ *                        const void *pvTxData,
+ *                        size_t xDataLengthBytes,
+ *                        TickType_t xTicksToWait );
+ * @endcode
+ *
+ * Sends bytes to a stream buffer.  The bytes are copied into the stream buffer.
+ *
+ * ***NOTE***:  Uniquely among FreeRTOS objects, the stream buffer
+ * implementation (so also the message buffer implementation, as message buffers
+ * are built on top of stream buffers) assumes there is only one task or
+ * interrupt that will write to the buffer (the writer), and only one task or
+ * interrupt that will read from the buffer (the reader).  It is safe for the
+ * writer and reader to be different tasks or interrupts, but, unlike other
+ * FreeRTOS objects, it is not safe to have multiple different writers or
+ * multiple different readers.  If there are to be multiple different writers
+ * then the application writer must place each call to a writing API function
+ * (such as xStreamBufferSend()) inside a critical section and set the send
+ * block time to 0.  Likewise, if there are to be multiple different readers
+ * then the application writer must place each call to a reading API function
+ * (such as xStreamBufferReceive()) inside a critical section and set the receive
+ * block time to 0.
+ *
+ * Use xStreamBufferSend() to write to a stream buffer from a task.  Use
+ * xStreamBufferSendFromISR() to write to a stream buffer from an interrupt
+ * service routine (ISR).
+ *
+ * @param xStreamBuffer The handle of the stream buffer to which a stream is
+ * being sent.
+ *
+ * @param pvTxData A pointer to the buffer that holds the bytes to be copied
+ * into the stream buffer.
+ *
+ * @param xDataLengthBytes   The maximum number of bytes to copy from pvTxData
+ * into the stream buffer.
+ *
+ * @param xTicksToWait The maximum amount of time the task should remain in the
+ * Blocked state to wait for enough space to become available in the stream
+ * buffer, should the stream buffer contain too little space to hold the
+ * another xDataLengthBytes bytes.  The block time is specified in tick periods,
+ * so the absolute time it represents is dependent on the tick frequency.  The
+ * macro pdMS_TO_TICKS() can be used to convert a time specified in milliseconds
+ * into a time specified in ticks.  Setting xTicksToWait to portMAX_DELAY will
+ * cause the task to wait indefinitely (without timing out), provided
+ * INCLUDE_vTaskSuspend is set to 1 in FreeRTOSConfig.h.  If a task times out
+ * before it can write all xDataLengthBytes into the buffer it will still write
+ * as many bytes as possible.  A task does not use any CPU time when it is in
+ * the blocked state.
+ *
+ * @return The number of bytes written to the stream buffer.  If a task times
+ * out before it can write all xDataLengthBytes into the buffer it will still
+ * write as many bytes as possible.
+ *
+ * Example use:
+ * @code{c}
+ * void vAFunction( StreamBufferHandle_t xStreamBuffer )
+ * {
+ * size_t xBytesSent;
+ * uint8_t ucArrayToSend[] = { 0, 1, 2, 3 };
+ * char *pcStringToSend = "String to send";
+ * const TickType_t x100ms = pdMS_TO_TICKS( 100 );
+ *
+ *  // Send an array to the stream buffer, blocking for a maximum of 100ms to
+ *  // wait for enough space to be available in the stream buffer.
+ *  xBytesSent = xStreamBufferSend( xStreamBuffer, ( void * ) ucArrayToSend, sizeof( ucArrayToSend ), x100ms );
+ *
+ *  if( xBytesSent != sizeof( ucArrayToSend ) )
+ *  {
+ *      // The call to xStreamBufferSend() times out before there was enough
+ *      // space in the buffer for the data to be written, but it did
+ *      // successfully write xBytesSent bytes.
+ *  }
+ *
+ *  // Send the string to the stream buffer.  Return immediately if there is not
+ *  // enough space in the buffer.
+ *  xBytesSent = xStreamBufferSend( xStreamBuffer, ( void * ) pcStringToSend, strlen( pcStringToSend ), 0 );
+ *
+ *  if( xBytesSent != strlen( pcStringToSend ) )
+ *  {
+ *      // The entire string could not be added to the stream buffer because
+ *      // there was not enough free space in the buffer, but xBytesSent bytes
+ *      // were sent.  Could try again to send the remaining bytes.
+ *  }
+ * }
+ * @endcode
+ * \defgroup xStreamBufferSend xStreamBufferSend
+ * \ingroup StreamBufferManagement
+ */
+size_t xStreamBufferSend( StreamBufferHandle_t xStreamBuffer,
+                          const void * pvTxData,
+                          size_t xDataLengthBytes,
+                          TickType_t xTicksToWait ) PRIVILEGED_FUNCTION;
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * size_t xStreamBufferSendFromISR( StreamBufferHandle_t xStreamBuffer,
+ *                               const void *pvTxData,
+ *                               size_t xDataLengthBytes,
+ *                               BaseType_t *pxHigherPriorityTaskWoken );
+ * @endcode
+ *
+ * Interrupt safe version of the API function that sends a stream of bytes to
+ * the stream buffer.
+ *
+ * ***NOTE***:  Uniquely among FreeRTOS objects, the stream buffer
+ * implementation (so also the message buffer implementation, as message buffers
+ * are built on top of stream buffers) assumes there is only one task or
+ * interrupt that will write to the buffer (the writer), and only one task or
+ * interrupt that will read from the buffer (the reader).  It is safe for the
+ * writer and reader to be different tasks or interrupts, but, unlike other
+ * FreeRTOS objects, it is not safe to have multiple different writers or
+ * multiple different readers.  If there are to be multiple different writers
+ * then the application writer must place each call to a writing API function
+ * (such as xStreamBufferSend()) inside a critical section and set the send
+ * block time to 0.  Likewise, if there are to be multiple different readers
+ * then the application writer must place each call to a reading API function
+ * (such as xStreamBufferReceive()) inside a critical section and set the receive
+ * block time to 0.
+ *
+ * Use xStreamBufferSend() to write to a stream buffer from a task.  Use
+ * xStreamBufferSendFromISR() to write to a stream buffer from an interrupt
+ * service routine (ISR).
+ *
+ * @param xStreamBuffer The handle of the stream buffer to which a stream is
+ * being sent.
+ *
+ * @param pvTxData A pointer to the data that is to be copied into the stream
+ * buffer.
+ *
+ * @param xDataLengthBytes The maximum number of bytes to copy from pvTxData
+ * into the stream buffer.
+ *
+ * @param pxHigherPriorityTaskWoken  It is possible that a stream buffer will
+ * have a task blocked on it waiting for data.  Calling
+ * xStreamBufferSendFromISR() can make data available, and so cause a task that
+ * was waiting for data to leave the Blocked state.  If calling
+ * xStreamBufferSendFromISR() causes a task to leave the Blocked state, and the
+ * unblocked task has a priority higher than the currently executing task (the
+ * task that was interrupted), then, internally, xStreamBufferSendFromISR()
+ * will set *pxHigherPriorityTaskWoken to pdTRUE.  If
+ * xStreamBufferSendFromISR() sets this value to pdTRUE, then normally a
+ * context switch should be performed before the interrupt is exited.  This will
+ * ensure that the interrupt returns directly to the highest priority Ready
+ * state task.  *pxHigherPriorityTaskWoken should be set to pdFALSE before it
+ * is passed into the function.  See the example code below for an example.
+ *
+ * @return The number of bytes actually written to the stream buffer, which will
+ * be less than xDataLengthBytes if the stream buffer didn't have enough free
+ * space for all the bytes to be written.
+ *
+ * Example use:
+ * @code{c}
+ * // A stream buffer that has already been created.
+ * StreamBufferHandle_t xStreamBuffer;
+ *
+ * void vAnInterruptServiceRoutine( void )
+ * {
+ * size_t xBytesSent;
+ * char *pcStringToSend = "String to send";
+ * BaseType_t xHigherPriorityTaskWoken = pdFALSE; // Initialised to pdFALSE.
+ *
+ *  // Attempt to send the string to the stream buffer.
+ *  xBytesSent = xStreamBufferSendFromISR( xStreamBuffer,
+ *                                         ( void * ) pcStringToSend,
+ *                                         strlen( pcStringToSend ),
+ *                                         &xHigherPriorityTaskWoken );
+ *
+ *  if( xBytesSent != strlen( pcStringToSend ) )
+ *  {
+ *      // There was not enough free space in the stream buffer for the entire
+ *      // string to be written, ut xBytesSent bytes were written.
+ *  }
+ *
+ *  // If xHigherPriorityTaskWoken was set to pdTRUE inside
+ *  // xStreamBufferSendFromISR() then a task that has a priority above the
+ *  // priority of the currently executing task was unblocked and a context
+ *  // switch should be performed to ensure the ISR returns to the unblocked
+ *  // task.  In most FreeRTOS ports this is done by simply passing
+ *  // xHigherPriorityTaskWoken into taskYIELD_FROM_ISR(), which will test the
+ *  // variables value, and perform the context switch if necessary.  Check the
+ *  // documentation for the port in use for port specific instructions.
+ *  taskYIELD_FROM_ISR( xHigherPriorityTaskWoken );
+ * }
+ * @endcode
+ * \defgroup xStreamBufferSendFromISR xStreamBufferSendFromISR
+ * \ingroup StreamBufferManagement
+ */
+size_t xStreamBufferSendFromISR( StreamBufferHandle_t xStreamBuffer,
+                                 const void * pvTxData,
+                                 size_t xDataLengthBytes,
+                                 BaseType_t * const pxHigherPriorityTaskWoken ) PRIVILEGED_FUNCTION;
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * size_t xStreamBufferReceive( StreamBufferHandle_t xStreamBuffer,
+ *                           void *pvRxData,
+ *                           size_t xBufferLengthBytes,
+ *                           TickType_t xTicksToWait );
+ * @endcode
+ *
+ * Receives bytes from a stream buffer.
+ *
+ * ***NOTE***:  Uniquely among FreeRTOS objects, the stream buffer
+ * implementation (so also the message buffer implementation, as message buffers
+ * are built on top of stream buffers) assumes there is only one task or
+ * interrupt that will write to the buffer (the writer), and only one task or
+ * interrupt that will read from the buffer (the reader).  It is safe for the
+ * writer and reader to be different tasks or interrupts, but, unlike other
+ * FreeRTOS objects, it is not safe to have multiple different writers or
+ * multiple different readers.  If there are to be multiple different writers
+ * then the application writer must place each call to a writing API function
+ * (such as xStreamBufferSend()) inside a critical section and set the send
+ * block time to 0.  Likewise, if there are to be multiple different readers
+ * then the application writer must place each call to a reading API function
+ * (such as xStreamBufferReceive()) inside a critical section and set the receive
+ * block time to 0.
+ *
+ * Use xStreamBufferReceive() to read from a stream buffer from a task.  Use
+ * xStreamBufferReceiveFromISR() to read from a stream buffer from an
+ * interrupt service routine (ISR).
+ *
+ * @param xStreamBuffer The handle of the stream buffer from which bytes are to
+ * be received.
+ *
+ * @param pvRxData A pointer to the buffer into which the received bytes will be
+ * copied.
+ *
+ * @param xBufferLengthBytes The length of the buffer pointed to by the
+ * pvRxData parameter.  This sets the maximum number of bytes to receive in one
+ * call.  xStreamBufferReceive will return as many bytes as possible up to a
+ * maximum set by xBufferLengthBytes.
+ *
+ * @param xTicksToWait The maximum amount of time the task should remain in the
+ * Blocked state to wait for data to become available if the stream buffer is
+ * empty.  xStreamBufferReceive() will return immediately if xTicksToWait is
+ * zero.  The block time is specified in tick periods, so the absolute time it
+ * represents is dependent on the tick frequency.  The macro pdMS_TO_TICKS() can
+ * be used to convert a time specified in milliseconds into a time specified in
+ * ticks.  Setting xTicksToWait to portMAX_DELAY will cause the task to wait
+ * indefinitely (without timing out), provided INCLUDE_vTaskSuspend is set to 1
+ * in FreeRTOSConfig.h.  A task does not use any CPU time when it is in the
+ * Blocked state.
+ *
+ * @return The number of bytes actually read from the stream buffer, which will
+ * be less than xBufferLengthBytes if the call to xStreamBufferReceive() timed
+ * out before xBufferLengthBytes were available.
+ *
+ * Example use:
+ * @code{c}
+ * void vAFunction( StreamBuffer_t xStreamBuffer )
+ * {
+ * uint8_t ucRxData[ 20 ];
+ * size_t xReceivedBytes;
+ * const TickType_t xBlockTime = pdMS_TO_TICKS( 20 );
+ *
+ *  // Receive up to another sizeof( ucRxData ) bytes from the stream buffer.
+ *  // Wait in the Blocked state (so not using any CPU processing time) for a
+ *  // maximum of 100ms for the full sizeof( ucRxData ) number of bytes to be
+ *  // available.
+ *  xReceivedBytes = xStreamBufferReceive( xStreamBuffer,
+ *                                         ( void * ) ucRxData,
+ *                                         sizeof( ucRxData ),
+ *                                         xBlockTime );
+ *
+ *  if( xReceivedBytes > 0 )
+ *  {
+ *      // A ucRxData contains another xRecievedBytes bytes of data, which can
+ *      // be processed here....
+ *  }
+ * }
+ * @endcode
+ * \defgroup xStreamBufferReceive xStreamBufferReceive
+ * \ingroup StreamBufferManagement
+ */
+size_t xStreamBufferReceive( StreamBufferHandle_t xStreamBuffer,
+                             void * pvRxData,
+                             size_t xBufferLengthBytes,
+                             TickType_t xTicksToWait ) PRIVILEGED_FUNCTION;
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * size_t xStreamBufferReceiveFromISR( StreamBufferHandle_t xStreamBuffer,
+ *                                  void *pvRxData,
+ *                                  size_t xBufferLengthBytes,
+ *                                  BaseType_t *pxHigherPriorityTaskWoken );
+ * @endcode
+ *
+ * An interrupt safe version of the API function that receives bytes from a
+ * stream buffer.
+ *
+ * Use xStreamBufferReceive() to read bytes from a stream buffer from a task.
+ * Use xStreamBufferReceiveFromISR() to read bytes from a stream buffer from an
+ * interrupt service routine (ISR).
+ *
+ * @param xStreamBuffer The handle of the stream buffer from which a stream
+ * is being received.
+ *
+ * @param pvRxData A pointer to the buffer into which the received bytes are
+ * copied.
+ *
+ * @param xBufferLengthBytes The length of the buffer pointed to by the
+ * pvRxData parameter.  This sets the maximum number of bytes to receive in one
+ * call.  xStreamBufferReceive will return as many bytes as possible up to a
+ * maximum set by xBufferLengthBytes.
+ *
+ * @param pxHigherPriorityTaskWoken  It is possible that a stream buffer will
+ * have a task blocked on it waiting for space to become available.  Calling
+ * xStreamBufferReceiveFromISR() can make space available, and so cause a task
+ * that is waiting for space to leave the Blocked state.  If calling
+ * xStreamBufferReceiveFromISR() causes a task to leave the Blocked state, and
+ * the unblocked task has a priority higher than the currently executing task
+ * (the task that was interrupted), then, internally,
+ * xStreamBufferReceiveFromISR() will set *pxHigherPriorityTaskWoken to pdTRUE.
+ * If xStreamBufferReceiveFromISR() sets this value to pdTRUE, then normally a
+ * context switch should be performed before the interrupt is exited.  That will
+ * ensure the interrupt returns directly to the highest priority Ready state
+ * task.  *pxHigherPriorityTaskWoken should be set to pdFALSE before it is
+ * passed into the function.  See the code example below for an example.
+ *
+ * @return The number of bytes read from the stream buffer, if any.
+ *
+ * Example use:
+ * @code{c}
+ * // A stream buffer that has already been created.
+ * StreamBuffer_t xStreamBuffer;
+ *
+ * void vAnInterruptServiceRoutine( void )
+ * {
+ * uint8_t ucRxData[ 20 ];
+ * size_t xReceivedBytes;
+ * BaseType_t xHigherPriorityTaskWoken = pdFALSE;  // Initialised to pdFALSE.
+ *
+ *  // Receive the next stream from the stream buffer.
+ *  xReceivedBytes = xStreamBufferReceiveFromISR( xStreamBuffer,
+ *                                                ( void * ) ucRxData,
+ *                                                sizeof( ucRxData ),
+ *                                                &xHigherPriorityTaskWoken );
+ *
+ *  if( xReceivedBytes > 0 )
+ *  {
+ *      // ucRxData contains xReceivedBytes read from the stream buffer.
+ *      // Process the stream here....
+ *  }
+ *
+ *  // If xHigherPriorityTaskWoken was set to pdTRUE inside
+ *  // xStreamBufferReceiveFromISR() then a task that has a priority above the
+ *  // priority of the currently executing task was unblocked and a context
+ *  // switch should be performed to ensure the ISR returns to the unblocked
+ *  // task.  In most FreeRTOS ports this is done by simply passing
+ *  // xHigherPriorityTaskWoken into taskYIELD_FROM_ISR(), which will test the
+ *  // variables value, and perform the context switch if necessary.  Check the
+ *  // documentation for the port in use for port specific instructions.
+ *  taskYIELD_FROM_ISR( xHigherPriorityTaskWoken );
+ * }
+ * @endcode
+ * \defgroup xStreamBufferReceiveFromISR xStreamBufferReceiveFromISR
+ * \ingroup StreamBufferManagement
+ */
+size_t xStreamBufferReceiveFromISR( StreamBufferHandle_t xStreamBuffer,
+                                    void * pvRxData,
+                                    size_t xBufferLengthBytes,
+                                    BaseType_t * const pxHigherPriorityTaskWoken ) PRIVILEGED_FUNCTION;
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * void vStreamBufferDelete( StreamBufferHandle_t xStreamBuffer );
+ * @endcode
+ *
+ * Deletes a stream buffer that was previously created using a call to
+ * xStreamBufferCreate() or xStreamBufferCreateStatic().  If the stream
+ * buffer was created using dynamic memory (that is, by xStreamBufferCreate()),
+ * then the allocated memory is freed.
+ *
+ * A stream buffer handle must not be used after the stream buffer has been
+ * deleted.
+ *
+ * @param xStreamBuffer The handle of the stream buffer to be deleted.
+ *
+ * \defgroup vStreamBufferDelete vStreamBufferDelete
+ * \ingroup StreamBufferManagement
+ */
+void vStreamBufferDelete( StreamBufferHandle_t xStreamBuffer ) PRIVILEGED_FUNCTION;
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * BaseType_t xStreamBufferIsFull( StreamBufferHandle_t xStreamBuffer );
+ * @endcode
+ *
+ * Queries a stream buffer to see if it is full.  A stream buffer is full if it
+ * does not have any free space, and therefore cannot accept any more data.
+ *
+ * @param xStreamBuffer The handle of the stream buffer being queried.
+ *
+ * @return If the stream buffer is full then pdTRUE is returned.  Otherwise
+ * pdFALSE is returned.
+ *
+ * \defgroup xStreamBufferIsFull xStreamBufferIsFull
+ * \ingroup StreamBufferManagement
+ */
+BaseType_t xStreamBufferIsFull( StreamBufferHandle_t xStreamBuffer ) PRIVILEGED_FUNCTION;
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * BaseType_t xStreamBufferIsEmpty( StreamBufferHandle_t xStreamBuffer );
+ * @endcode
+ *
+ * Queries a stream buffer to see if it is empty.  A stream buffer is empty if
+ * it does not contain any data.
+ *
+ * @param xStreamBuffer The handle of the stream buffer being queried.
+ *
+ * @return If the stream buffer is empty then pdTRUE is returned.  Otherwise
+ * pdFALSE is returned.
+ *
+ * \defgroup xStreamBufferIsEmpty xStreamBufferIsEmpty
+ * \ingroup StreamBufferManagement
+ */
+BaseType_t xStreamBufferIsEmpty( StreamBufferHandle_t xStreamBuffer ) PRIVILEGED_FUNCTION;
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * BaseType_t xStreamBufferReset( StreamBufferHandle_t xStreamBuffer );
+ * @endcode
+ *
+ * Resets a stream buffer to its initial, empty, state.  Any data that was in
+ * the stream buffer is discarded.  A stream buffer can only be reset if there
+ * are no tasks blocked waiting to either send to or receive from the stream
+ * buffer.
+ *
+ * @param xStreamBuffer The handle of the stream buffer being reset.
+ *
+ * @return If the stream buffer is reset then pdPASS is returned.  If there was
+ * a task blocked waiting to send to or read from the stream buffer then the
+ * stream buffer is not reset and pdFAIL is returned.
+ *
+ * \defgroup xStreamBufferReset xStreamBufferReset
+ * \ingroup StreamBufferManagement
+ */
+BaseType_t xStreamBufferReset( StreamBufferHandle_t xStreamBuffer ) PRIVILEGED_FUNCTION;
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * size_t xStreamBufferSpacesAvailable( StreamBufferHandle_t xStreamBuffer );
+ * @endcode
+ *
+ * Queries a stream buffer to see how much free space it contains, which is
+ * equal to the amount of data that can be sent to the stream buffer before it
+ * is full.
+ *
+ * @param xStreamBuffer The handle of the stream buffer being queried.
+ *
+ * @return The number of bytes that can be written to the stream buffer before
+ * the stream buffer would be full.
+ *
+ * \defgroup xStreamBufferSpacesAvailable xStreamBufferSpacesAvailable
+ * \ingroup StreamBufferManagement
+ */
+size_t xStreamBufferSpacesAvailable( StreamBufferHandle_t xStreamBuffer ) PRIVILEGED_FUNCTION;
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * size_t xStreamBufferBytesAvailable( StreamBufferHandle_t xStreamBuffer );
+ * @endcode
+ *
+ * Queries a stream buffer to see how much data it contains, which is equal to
+ * the number of bytes that can be read from the stream buffer before the stream
+ * buffer would be empty.
+ *
+ * @param xStreamBuffer The handle of the stream buffer being queried.
+ *
+ * @return The number of bytes that can be read from the stream buffer before
+ * the stream buffer would be empty.
+ *
+ * \defgroup xStreamBufferBytesAvailable xStreamBufferBytesAvailable
+ * \ingroup StreamBufferManagement
+ */
+size_t xStreamBufferBytesAvailable( StreamBufferHandle_t xStreamBuffer ) PRIVILEGED_FUNCTION;
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * BaseType_t xStreamBufferSetTriggerLevel( StreamBufferHandle_t xStreamBuffer, size_t xTriggerLevel );
+ * @endcode
+ *
+ * A stream buffer's trigger level is the number of bytes that must be in the
+ * stream buffer before a task that is blocked on the stream buffer to
+ * wait for data is moved out of the blocked state.  For example, if a task is
+ * blocked on a read of an empty stream buffer that has a trigger level of 1
+ * then the task will be unblocked when a single byte is written to the buffer
+ * or the task's block time expires.  As another example, if a task is blocked
+ * on a read of an empty stream buffer that has a trigger level of 10 then the
+ * task will not be unblocked until the stream buffer contains at least 10 bytes
+ * or the task's block time expires.  If a reading task's block time expires
+ * before the trigger level is reached then the task will still receive however
+ * many bytes are actually available.  Setting a trigger level of 0 will result
+ * in a trigger level of 1 being used.  It is not valid to specify a trigger
+ * level that is greater than the buffer size.
+ *
+ * A trigger level is set when the stream buffer is created, and can be modified
+ * using xStreamBufferSetTriggerLevel().
+ *
+ * @param xStreamBuffer The handle of the stream buffer being updated.
+ *
+ * @param xTriggerLevel The new trigger level for the stream buffer.
+ *
+ * @return If xTriggerLevel was less than or equal to the stream buffer's length
+ * then the trigger level will be updated and pdTRUE is returned.  Otherwise
+ * pdFALSE is returned.
+ *
+ * \defgroup xStreamBufferSetTriggerLevel xStreamBufferSetTriggerLevel
+ * \ingroup StreamBufferManagement
+ */
+BaseType_t xStreamBufferSetTriggerLevel( StreamBufferHandle_t xStreamBuffer,
+                                         size_t xTriggerLevel ) PRIVILEGED_FUNCTION;
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * BaseType_t xStreamBufferSendCompletedFromISR( StreamBufferHandle_t xStreamBuffer, BaseType_t *pxHigherPriorityTaskWoken );
+ * @endcode
+ *
+ * For advanced users only.
+ *
+ * The sbSEND_COMPLETED() macro is called from within the FreeRTOS APIs when
+ * data is sent to a message buffer or stream buffer.  If there was a task that
+ * was blocked on the message or stream buffer waiting for data to arrive then
+ * the sbSEND_COMPLETED() macro sends a notification to the task to remove it
+ * from the Blocked state.  xStreamBufferSendCompletedFromISR() does the same
+ * thing.  It is provided to enable application writers to implement their own
+ * version of sbSEND_COMPLETED(), and MUST NOT BE USED AT ANY OTHER TIME.
+ *
+ * See the example implemented in FreeRTOS/Demo/Minimal/MessageBufferAMP.c for
+ * additional information.
+ *
+ * @param xStreamBuffer The handle of the stream buffer to which data was
+ * written.
+ *
+ * @param pxHigherPriorityTaskWoken *pxHigherPriorityTaskWoken should be
+ * initialised to pdFALSE before it is passed into
+ * xStreamBufferSendCompletedFromISR().  If calling
+ * xStreamBufferSendCompletedFromISR() removes a task from the Blocked state,
+ * and the task has a priority above the priority of the currently running task,
+ * then *pxHigherPriorityTaskWoken will get set to pdTRUE indicating that a
+ * context switch should be performed before exiting the ISR.
+ *
+ * @return If a task was removed from the Blocked state then pdTRUE is returned.
+ * Otherwise pdFALSE is returned.
+ *
+ * \defgroup xStreamBufferSendCompletedFromISR xStreamBufferSendCompletedFromISR
+ * \ingroup StreamBufferManagement
+ */
+BaseType_t xStreamBufferSendCompletedFromISR( StreamBufferHandle_t xStreamBuffer,
+                                              BaseType_t * pxHigherPriorityTaskWoken ) PRIVILEGED_FUNCTION;
+
+/**
+ * stream_buffer.h
+ *
+ * @code{c}
+ * BaseType_t xStreamBufferReceiveCompletedFromISR( StreamBufferHandle_t xStreamBuffer, BaseType_t *pxHigherPriorityTaskWoken );
+ * @endcode
+ *
+ * For advanced users only.
+ *
+ * The sbRECEIVE_COMPLETED() macro is called from within the FreeRTOS APIs when
+ * data is read out of a message buffer or stream buffer.  If there was a task
+ * that was blocked on the message or stream buffer waiting for data to arrive
+ * then the sbRECEIVE_COMPLETED() macro sends a notification to the task to
+ * remove it from the Blocked state.  xStreamBufferReceiveCompletedFromISR()
+ * does the same thing.  It is provided to enable application writers to
+ * implement their own version of sbRECEIVE_COMPLETED(), and MUST NOT BE USED AT
+ * ANY OTHER TIME.
+ *
+ * See the example implemented in FreeRTOS/Demo/Minimal/MessageBufferAMP.c for
+ * additional information.
+ *
+ * @param xStreamBuffer The handle of the stream buffer from which data was
+ * read.
+ *
+ * @param pxHigherPriorityTaskWoken *pxHigherPriorityTaskWoken should be
+ * initialised to pdFALSE before it is passed into
+ * xStreamBufferReceiveCompletedFromISR().  If calling
+ * xStreamBufferReceiveCompletedFromISR() removes a task from the Blocked state,
+ * and the task has a priority above the priority of the currently running task,
+ * then *pxHigherPriorityTaskWoken will get set to pdTRUE indicating that a
+ * context switch should be performed before exiting the ISR.
+ *
+ * @return If a task was removed from the Blocked state then pdTRUE is returned.
+ * Otherwise pdFALSE is returned.
+ *
+ * \defgroup xStreamBufferReceiveCompletedFromISR xStreamBufferReceiveCompletedFromISR
+ * \ingroup StreamBufferManagement
+ */
+BaseType_t xStreamBufferReceiveCompletedFromISR( StreamBufferHandle_t xStreamBuffer,
+                                                 BaseType_t * pxHigherPriorityTaskWoken ) PRIVILEGED_FUNCTION;
+
+/* Functions below here are not part of the public API. */
+StreamBufferHandle_t xStreamBufferGenericCreate( size_t xBufferSizeBytes,
+                                                 size_t xTriggerLevelBytes,
+                                                 BaseType_t xIsMessageBuffer ) PRIVILEGED_FUNCTION;
+
+StreamBufferHandle_t xStreamBufferGenericCreateStatic( size_t xBufferSizeBytes,
+                                                       size_t xTriggerLevelBytes,
+                                                       BaseType_t xIsMessageBuffer,
+                                                       uint8_t * const pucStreamBufferStorageArea,
+                                                       StaticStreamBuffer_t * const pxStaticStreamBuffer ) PRIVILEGED_FUNCTION;
+
+size_t xStreamBufferNextMessageLengthBytes( StreamBufferHandle_t xStreamBuffer ) PRIVILEGED_FUNCTION;
+
+#if ( configUSE_TRACE_FACILITY == 1 )
+    void vStreamBufferSetStreamBufferNumber( StreamBufferHandle_t xStreamBuffer,
+                                             UBaseType_t uxStreamBufferNumber ) PRIVILEGED_FUNCTION;
+    UBaseType_t uxStreamBufferGetStreamBufferNumber( StreamBufferHandle_t xStreamBuffer ) PRIVILEGED_FUNCTION;
+    uint8_t ucStreamBufferGetStreamBufferType( StreamBufferHandle_t xStreamBuffer ) PRIVILEGED_FUNCTION;
+#endif
+
+/* *INDENT-OFF* */
+#if defined( __cplusplus )
+    }
+#endif
+/* *INDENT-ON* */
+
+#endif /* !defined( STREAM_BUFFER_H ) */

freertos/Source/list.c

@@ -0,0 +1,215 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+
+#include <stdlib.h>
+
+/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
+ * all the API functions to use the MPU wrappers.  That should only be done when
+ * task.h is included from an application file. */
+#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+#include "FreeRTOS.h"
+#include "list.h"
+
+/* Lint e9021, e961 and e750 are suppressed as a MISRA exception justified
+ * because the MPU ports require MPU_WRAPPERS_INCLUDED_FROM_API_FILE to be
+ * defined for the header files above, but not in this file, in order to
+ * generate the correct privileged Vs unprivileged linkage and placement. */
+#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE /*lint !e961 !e750 !e9021. */
+
+/*-----------------------------------------------------------
+* PUBLIC LIST API documented in list.h
+*----------------------------------------------------------*/
+
+void vListInitialise( List_t * const pxList )
+{
+    /* The list structure contains a list item which is used to mark the
+     * end of the list.  To initialise the list the list end is inserted
+     * as the only list entry. */
+    pxList->pxIndex = ( ListItem_t * ) &( pxList->xListEnd ); /*lint !e826 !e740 !e9087 The mini list structure is used as the list end to save RAM.  This is checked and valid. */
+
+    /* The list end value is the highest possible value in the list to
+     * ensure it remains at the end of the list. */
+    pxList->xListEnd.xItemValue = portMAX_DELAY;
+
+    /* The list end next and previous pointers point to itself so we know
+     * when the list is empty. */
+    pxList->xListEnd.pxNext = ( ListItem_t * ) &( pxList->xListEnd );     /*lint !e826 !e740 !e9087 The mini list structure is used as the list end to save RAM.  This is checked and valid. */
+    pxList->xListEnd.pxPrevious = ( ListItem_t * ) &( pxList->xListEnd ); /*lint !e826 !e740 !e9087 The mini list structure is used as the list end to save RAM.  This is checked and valid. */
+
+    pxList->uxNumberOfItems = ( UBaseType_t ) 0U;
+
+    /* Write known values into the list if
+     * configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES is set to 1. */
+    listSET_LIST_INTEGRITY_CHECK_1_VALUE( pxList );
+    listSET_LIST_INTEGRITY_CHECK_2_VALUE( pxList );
+}
+/*-----------------------------------------------------------*/
+
+void vListInitialiseItem( ListItem_t * const pxItem )
+{
+    /* Make sure the list item is not recorded as being on a list. */
+    pxItem->pxContainer = NULL;
+
+    /* Write known values into the list item if
+     * configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES is set to 1. */
+    listSET_FIRST_LIST_ITEM_INTEGRITY_CHECK_VALUE( pxItem );
+    listSET_SECOND_LIST_ITEM_INTEGRITY_CHECK_VALUE( pxItem );
+}
+/*-----------------------------------------------------------*/
+
+void vListInsertEnd( List_t * const pxList,
+                     ListItem_t * const pxNewListItem )
+{
+    ListItem_t * const pxIndex = pxList->pxIndex;
+
+    /* Only effective when configASSERT() is also defined, these tests may catch
+     * the list data structures being overwritten in memory.  They will not catch
+     * data errors caused by incorrect configuration or use of FreeRTOS. */
+    listTEST_LIST_INTEGRITY( pxList );
+    listTEST_LIST_ITEM_INTEGRITY( pxNewListItem );
+
+    /* Insert a new list item into pxList, but rather than sort the list,
+     * makes the new list item the last item to be removed by a call to
+     * listGET_OWNER_OF_NEXT_ENTRY(). */
+    pxNewListItem->pxNext = pxIndex;
+    pxNewListItem->pxPrevious = pxIndex->pxPrevious;
+
+    /* Only used during decision coverage testing. */
+    mtCOVERAGE_TEST_DELAY();
+
+    pxIndex->pxPrevious->pxNext = pxNewListItem;
+    pxIndex->pxPrevious = pxNewListItem;
+
+    /* Remember which list the item is in. */
+    pxNewListItem->pxContainer = pxList;
+
+    ( pxList->uxNumberOfItems )++;
+}
+/*-----------------------------------------------------------*/
+
+void vListInsert( List_t * const pxList,
+                  ListItem_t * const pxNewListItem )
+{
+    ListItem_t * pxIterator;
+    const TickType_t xValueOfInsertion = pxNewListItem->xItemValue;
+
+    /* Only effective when configASSERT() is also defined, these tests may catch
+     * the list data structures being overwritten in memory.  They will not catch
+     * data errors caused by incorrect configuration or use of FreeRTOS. */
+    listTEST_LIST_INTEGRITY( pxList );
+    listTEST_LIST_ITEM_INTEGRITY( pxNewListItem );
+
+    /* Insert the new list item into the list, sorted in xItemValue order.
+     *
+     * If the list already contains a list item with the same item value then the
+     * new list item should be placed after it.  This ensures that TCBs which are
+     * stored in ready lists (all of which have the same xItemValue value) get a
+     * share of the CPU.  However, if the xItemValue is the same as the back marker
+     * the iteration loop below will not end.  Therefore the value is checked
+     * first, and the algorithm slightly modified if necessary. */
+    if( xValueOfInsertion == portMAX_DELAY )
+    {
+        pxIterator = pxList->xListEnd.pxPrevious;
+    }
+    else
+    {
+        /* *** NOTE ***********************************************************
+        *  If you find your application is crashing here then likely causes are
+        *  listed below.  In addition see https://www.FreeRTOS.org/FAQHelp.html for
+        *  more tips, and ensure configASSERT() is defined!
+        *  https://www.FreeRTOS.org/a00110.html#configASSERT
+        *
+        *   1) Stack overflow -
+        *      see https://www.FreeRTOS.org/Stacks-and-stack-overflow-checking.html
+        *   2) Incorrect interrupt priority assignment, especially on Cortex-M
+        *      parts where numerically high priority values denote low actual
+        *      interrupt priorities, which can seem counter intuitive.  See
+        *      https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html and the definition
+        *      of configMAX_SYSCALL_INTERRUPT_PRIORITY on
+        *      https://www.FreeRTOS.org/a00110.html
+        *   3) Calling an API function from within a critical section or when
+        *      the scheduler is suspended, or calling an API function that does
+        *      not end in "FromISR" from an interrupt.
+        *   4) Using a queue or semaphore before it has been initialised or
+        *      before the scheduler has been started (are interrupts firing
+        *      before vTaskStartScheduler() has been called?).
+        *   5) If the FreeRTOS port supports interrupt nesting then ensure that
+        *      the priority of the tick interrupt is at or below
+        *      configMAX_SYSCALL_INTERRUPT_PRIORITY.
+        **********************************************************************/
+
+        for( pxIterator = ( ListItem_t * ) &( pxList->xListEnd ); pxIterator->pxNext->xItemValue <= xValueOfInsertion; pxIterator = pxIterator->pxNext ) /*lint !e826 !e740 !e9087 The mini list structure is used as the list end to save RAM.  This is checked and valid. *//*lint !e440 The iterator moves to a different value, not xValueOfInsertion. */
+        {
+            /* There is nothing to do here, just iterating to the wanted
+             * insertion position. */
+        }
+    }
+
+    pxNewListItem->pxNext = pxIterator->pxNext;
+    pxNewListItem->pxNext->pxPrevious = pxNewListItem;
+    pxNewListItem->pxPrevious = pxIterator;
+    pxIterator->pxNext = pxNewListItem;
+
+    /* Remember which list the item is in.  This allows fast removal of the
+     * item later. */
+    pxNewListItem->pxContainer = pxList;
+
+    ( pxList->uxNumberOfItems )++;
+}
+/*-----------------------------------------------------------*/
+
+UBaseType_t uxListRemove( ListItem_t * const pxItemToRemove )
+{
+/* The list item knows which list it is in.  Obtain the list from the list
+ * item. */
+    List_t * const pxList = pxItemToRemove->pxContainer;
+
+    pxItemToRemove->pxNext->pxPrevious = pxItemToRemove->pxPrevious;
+    pxItemToRemove->pxPrevious->pxNext = pxItemToRemove->pxNext;
+
+    /* Only used during decision coverage testing. */
+    mtCOVERAGE_TEST_DELAY();
+
+    /* Make sure the index is left pointing to a valid item. */
+    if( pxList->pxIndex == pxItemToRemove )
+    {
+        pxList->pxIndex = pxItemToRemove->pxPrevious;
+    }
+    else
+    {
+        mtCOVERAGE_TEST_MARKER();
+    }
+
+    pxItemToRemove->pxContainer = NULL;
+    ( pxList->uxNumberOfItems )--;
+
+    return pxList->uxNumberOfItems;
+}
+/*-----------------------------------------------------------*/

freertos/Source/portable/ARMClang/Use-the-GCC-ports.txt

@@ -0,0 +1,2 @@
+The FreeRTOS GCC port layer also builds and works with the ARMClang compiler.
+To use the ARMClang compiler build the port files from FreeRTOS/Source/portable/GCC.

freertos/Source/portable/ARMv8M/ReadMe.txt

@@ -0,0 +1,10 @@
+This directory tree contains the master copy of the FreeeRTOS Cortex-M33 port.
+Do not use the files located here!  These file are copied into separate
+FreeRTOS/Source/portable/[compiler]/ARM_CM33_NNN directories prior to each
+FreeRTOS release.
+
+If your Cortex-M33 application uses TrustZone then use the files from the
+FreeRTOS/Source/portable/[compiler]/ARM_CM33 directories.
+
+If your Cortex-M33 application does not use TrustZone then use the files from
+the FreeRTOS/Source/portable/[compiler]/ARM_CM33_NTZ directories.

freertos/Source/portable/ARMv8M/copy_files.py

@@ -0,0 +1,104 @@
+#/*
+# * FreeRTOS Kernel V10.4.6
+# * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+# *
+# * SPDX-License-Identifier: MIT
+# *
+# * Permission is hereby granted, free of charge, to any person obtaining a copy of
+# * this software and associated documentation files (the "Software"), to deal in
+# * the Software without restriction, including without limitation the rights to
+# * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# * the Software, and to permit persons to whom the Software is furnished to do so,
+# * subject to the following conditions:
+# *
+# * The above copyright notice and this permission notice shall be included in all
+# * copies or substantial portions of the Software.
+# *
+# * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+# *
+# * https://www.FreeRTOS.org
+# * https://github.com/FreeRTOS
+# *
+# */
+
+import os
+import shutil
+
+_THIS_FILE_DIRECTORY_ = os.path.dirname(os.path.realpath(__file__))
+_FREERTOS_PORTABLE_DIRECTORY_ = os.path.dirname(_THIS_FILE_DIRECTORY_)
+
+_COMPILERS_ = ['GCC', 'IAR']
+_ARCH_NS_ = ['ARM_CM33', 'ARM_CM33_NTZ', 'ARM_CM23', 'ARM_CM23_NTZ']
+_ARCH_S_ = ['ARM_CM33', 'ARM_CM23']
+
+_SUPPORTED_CONFIGS_ =   {
+                            'GCC' : ['ARM_CM33', 'ARM_CM33_NTZ', 'ARM_CM23', 'ARM_CM23_NTZ'],
+                            'IAR' : ['ARM_CM33', 'ARM_CM33_NTZ', 'ARM_CM23', 'ARM_CM23_NTZ']
+                        }
+
+# Files to be complied in the Secure Project
+_SECURE_FILE_PATHS_ = [
+    os.path.join('secure', 'context'),
+    os.path.join('secure', 'context', 'portable', '_COMPILER_ARCH_'),
+    os.path.join('secure', 'heap'),
+    os.path.join('secure', 'init'),
+    os.path.join('secure', 'macros')
+]
+
+# Files to be complied in the Non-Secure Project
+_NONSECURE_FILE_PATHS_ = [
+    'non_secure',
+    os.path.join('non_secure', 'portable', '_COMPILER_ARCH_')
+]
+
+
+def is_supported_config(compiler, arch):
+    return arch in _SUPPORTED_CONFIGS_[compiler]
+
+
+def copy_files_in_dir(src_abs_path, dst_abs_path):
+    for src_file in os.listdir(src_abs_path):
+        src_file_abs_path = os.path.join(src_abs_path, src_file)
+        if os.path.isfile(src_file_abs_path) and src_file != 'ReadMe.txt':
+            if not os.path.exists(dst_abs_path):
+                os.makedirs(dst_abs_path)
+            print('Copying {}...'.format(os.path.basename(src_file_abs_path)))
+            shutil.copy2(src_file_abs_path, dst_abs_path)
+
+
+def copy_files_for_compiler_and_arch(compiler, arch, src_paths, dst_path):
+    _COMPILER_ARCH_ = os.path.join(compiler, arch)
+    for src_path in src_paths:
+        src_path_sanitized = src_path.replace('_COMPILER_ARCH_', _COMPILER_ARCH_ )
+
+        src_abs_path = os.path.join(_THIS_FILE_DIRECTORY_, src_path_sanitized)
+        dst_abs_path = os.path.join(_FREERTOS_PORTABLE_DIRECTORY_, _COMPILER_ARCH_, dst_path)
+
+        copy_files_in_dir(src_abs_path, dst_abs_path)
+
+
+def copy_files():
+    # Copy Secure Files
+    for compiler in _COMPILERS_:
+        for arch in _ARCH_S_:
+            if is_supported_config(compiler, arch):
+                copy_files_for_compiler_and_arch(compiler, arch, _SECURE_FILE_PATHS_, 'secure')
+
+    # Copy Non-Secure Files
+    for compiler in _COMPILERS_:
+        for arch in _ARCH_NS_:
+            if is_supported_config(compiler, arch):
+                copy_files_for_compiler_and_arch(compiler, arch, _NONSECURE_FILE_PATHS_, 'non_secure')
+
+
+def main():
+    copy_files()
+
+
+if __name__ == '__main__':
+    main()

freertos/Source/portable/ARMv8M/non_secure/ReadMe.txt

@@ -0,0 +1,11 @@
+This directory tree contains the master copy of the FreeeRTOS Cortex-M33 port.
+Do not use the files located here!  These file are copied into separate
+FreeRTOS/Source/portable/[compiler]/ARM_CM33_NNN directories prior to each
+FreeRTOS release.
+
+If your Cortex-M33 application uses TrustZone then use the files from the
+FreeRTOS/Source/portable/[compiler]/ARM_CM33 directories.
+
+If your Cortex-M33 application does not use TrustZone then use the files from
+the FreeRTOS/Source/portable/[compiler]/ARM_CM33_NTZ directories.
+

freertos/Source/portable/ARMv8M/non_secure/portable/GCC/ARM_CM23/portasm.c

@@ -0,0 +1,460 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+/* Standard includes. */
+#include <stdint.h>
+
+/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE ensures that PRIVILEGED_FUNCTION
+ * is defined correctly and privileged functions are placed in correct sections. */
+#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+/* Portasm includes. */
+#include "portasm.h"
+
+/* MPU_WRAPPERS_INCLUDED_FROM_API_FILE is needed to be defined only for the
+ * header files. */
+#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+#if ( configENABLE_FPU == 1 )
+    #error Cortex-M23 does not have a Floating Point Unit (FPU) and therefore configENABLE_FPU must be set to 0.
+#endif
+
+void vRestoreContextOfFirstTask( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	.syntax unified									\n"
+        "													\n"
+        "	ldr  r2, pxCurrentTCBConst2						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr  r3, [r2]									\n"/* Read pxCurrentTCB. */
+        "	ldr  r0, [r3]									\n"/* Read top of stack from TCB - The first item in pxCurrentTCB is the task top of stack. */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	dmb											\n"/* Complete outstanding transfers before disabling MPU. */
+            "	ldr r2, xMPUCTRLConst2						\n"/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r4, [r2]								\n"/* Read the value of MPU_CTRL. */
+            "	movs r5, #1									\n"/* r5 = 1. */
+            "	bics r4, r5									\n"/* r4 = r4 & ~r5 i.e. Clear the bit 0 in r4. */
+            "	str r4, [r2]								\n"/* Disable MPU. */
+            "												\n"
+            "	adds r3, #4									\n"/* r3 = r3 + 4. r3 now points to MAIR0 in TCB. */
+            "	ldr  r4, [r3]								\n"/* r4 = *r3 i.e. r4 = MAIR0. */
+            "	ldr  r2, xMAIR0Const2						\n"/* r2 = 0xe000edc0 [Location of MAIR0]. */
+            "	str  r4, [r2]								\n"/* Program MAIR0. */
+            "	ldr  r2, xRNRConst2							\n"/* r2 = 0xe000ed98 [Location of RNR]. */
+            "	adds r3, #4									\n"/* r3 = r3 + 4. r3 now points to first RBAR in TCB. */
+            "	movs r5, #4									\n"/* r5 = 4. */
+            "	str  r5, [r2]								\n"/* Program RNR = 4. */
+            "	ldmia r3!, {r6,r7}							\n"/* Read first set of RBAR/RLAR from TCB. */
+            "	ldr  r4, xRBARConst2						\n"/* r4 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r4!, {r6,r7}							\n"/* Write first set of RBAR/RLAR registers. */
+            "	movs r5, #5									\n"/* r5 = 5. */
+            "	str  r5, [r2]								\n"/* Program RNR = 5. */
+            "	ldmia r3!, {r6,r7}							\n"/* Read second set of RBAR/RLAR from TCB. */
+            "	ldr  r4, xRBARConst2						\n"/* r4 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r4!, {r6,r7}							\n"/* Write second set of RBAR/RLAR registers. */
+            "	movs r5, #6									\n"/* r5 = 6. */
+            "	str  r5, [r2]								\n"/* Program RNR = 6. */
+            "	ldmia r3!, {r6,r7}							\n"/* Read third set of RBAR/RLAR from TCB. */
+            "	ldr  r4, xRBARConst2						\n"/* r4 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r4!, {r6,r7}							\n"/* Write third set of RBAR/RLAR registers. */
+            "	movs r5, #7									\n"/* r5 = 7. */
+            "	str  r5, [r2]								\n"/* Program RNR = 7. */
+            "	ldmia r3!, {r6,r7}							\n"/* Read fourth set of RBAR/RLAR from TCB. */
+            "	ldr  r4, xRBARConst2						\n"/* r4 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r4!, {r6,r7}							\n"/* Write fourth set of RBAR/RLAR registers. */
+            "												\n"
+            "	ldr r2, xMPUCTRLConst2						\n"/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r4, [r2]								\n"/* Read the value of MPU_CTRL. */
+            "	movs r5, #1									\n"/* r5 = 1. */
+            "	orrs r4, r5									\n"/* r4 = r4 | r5 i.e. Set the bit 0 in r4. */
+            "	str r4, [r2]								\n"/* Enable MPU. */
+            "	dsb											\n"/* Force memory writes before continuing. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	ldm  r0!, {r1-r4}							\n"/* Read from stack - r1 = xSecureContext, r2 = PSPLIM, r3 = CONTROL and r4 = EXC_RETURN. */
+            "	ldr  r5, xSecureContextConst2				\n"
+            "	str  r1, [r5]								\n"/* Set xSecureContext to this task's value for the same. */
+            "	msr  psplim, r2								\n"/* Set this task's PSPLIM value. */
+            "	msr  control, r3							\n"/* Set this task's CONTROL value. */
+            "	adds r0, #32								\n"/* Discard everything up to r0. */
+            "	msr  psp, r0								\n"/* This is now the new top of stack to use in the task. */
+            "	isb											\n"
+            "	bx   r4										\n"/* Finally, branch to EXC_RETURN. */
+        #else /* configENABLE_MPU */
+            "	ldm  r0!, {r1-r3}							\n"/* Read from stack - r1 = xSecureContext, r2 = PSPLIM and r3 = EXC_RETURN. */
+            "	ldr  r4, xSecureContextConst2				\n"
+            "	str  r1, [r4]								\n"/* Set xSecureContext to this task's value for the same. */
+            "	msr  psplim, r2								\n"/* Set this task's PSPLIM value. */
+            "	movs r1, #2									\n"/* r1 = 2. */
+            "	msr  CONTROL, r1							\n"/* Switch to use PSP in the thread mode. */
+            "	adds r0, #32								\n"/* Discard everything up to r0. */
+            "	msr  psp, r0								\n"/* This is now the new top of stack to use in the task. */
+            "	isb											\n"
+            "	bx   r3										\n"/* Finally, branch to EXC_RETURN. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        "	.align 4										\n"
+        "pxCurrentTCBConst2: .word pxCurrentTCB				\n"
+        "xSecureContextConst2: .word xSecureContext			\n"
+        #if ( configENABLE_MPU == 1 )
+            "xMPUCTRLConst2: .word 0xe000ed94				\n"
+            "xMAIR0Const2: .word 0xe000edc0					\n"
+            "xRNRConst2: .word 0xe000ed98					\n"
+            "xRBARConst2: .word 0xe000ed9c					\n"
+        #endif /* configENABLE_MPU */
+    );
+}
+/*-----------------------------------------------------------*/
+
+BaseType_t xIsPrivileged( void ) /* __attribute__ (( naked )) */
+{
+    __asm volatile
+    (
+        "	mrs r0, control									\n"/* r0 = CONTROL. */
+        "	movs r1, #1										\n"/* r1 = 1. */
+        "	tst r0, r1										\n"/* Perform r0 & r1 (bitwise AND) and update the conditions flag. */
+        "	beq running_privileged							\n"/* If the result of previous AND operation was 0, branch. */
+        "	movs r0, #0										\n"/* CONTROL[0]!=0. Return false to indicate that the processor is not privileged. */
+        "	bx lr											\n"/* Return. */
+        " running_privileged:								\n"
+        "	movs r0, #1										\n"/* CONTROL[0]==0. Return true to indicate that the processor is privileged. */
+        "	bx lr											\n"/* Return. */
+        "													\n"
+        "	.align 4										\n"
+        ::: "r0", "r1", "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vRaisePrivilege( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	mrs r0, control									\n"/* Read the CONTROL register. */
+        "	movs r1, #1										\n"/* r1 = 1. */
+        "	bics r0, r1										\n"/* Clear the bit 0. */
+        "	msr control, r0									\n"/* Write back the new CONTROL value. */
+        "	bx lr											\n"/* Return to the caller. */
+        ::: "r0", "r1", "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vResetPrivilege( void ) /* __attribute__ (( naked )) */
+{
+    __asm volatile
+    (
+        "	mrs r0, control									\n"/* r0 = CONTROL. */
+        "	movs r1, #1										\n"/* r1 = 1. */
+        "	orrs r0, r1										\n"/* r0 = r0 | r1. */
+        "	msr control, r0									\n"/* CONTROL = r0. */
+        "	bx lr											\n"/* Return to the caller. */
+        ::: "r0", "r1", "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vStartFirstTask( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	ldr r0, xVTORConst								\n"/* Use the NVIC offset register to locate the stack. */
+        "	ldr r0, [r0]									\n"/* Read the VTOR register which gives the address of vector table. */
+        "	ldr r0, [r0]									\n"/* The first entry in vector table is stack pointer. */
+        "	msr msp, r0										\n"/* Set the MSP back to the start of the stack. */
+        "	cpsie i											\n"/* Globally enable interrupts. */
+        "	dsb												\n"
+        "	isb												\n"
+        "	svc %0											\n"/* System call to start the first task. */
+        "	nop												\n"
+        "													\n"
+        "   .align 4										\n"
+        "xVTORConst: .word 0xe000ed08						\n"
+        ::"i" ( portSVC_START_SCHEDULER ) : "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+uint32_t ulSetInterruptMask( void ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	mrs r0, PRIMASK									\n"
+        "	cpsid i											\n"
+        "	bx lr											\n"
+        ::: "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vClearInterruptMask( __attribute__( ( unused ) ) uint32_t ulMask ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	msr PRIMASK, r0									\n"
+        "	bx lr											\n"
+        ::: "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void PendSV_Handler( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	.syntax unified									\n"
+        "	.extern SecureContext_SaveContext				\n"
+        "	.extern SecureContext_LoadContext				\n"
+        "													\n"
+        "	ldr r3, xSecureContextConst						\n"/* Read the location of xSecureContext i.e. &( xSecureContext ). */
+        "	ldr r0, [r3]									\n"/* Read xSecureContext - Value of xSecureContext must be in r0 as it is used as a parameter later. */
+        "	ldr r3, pxCurrentTCBConst						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr r1, [r3]									\n"/* Read pxCurrentTCB - Value of pxCurrentTCB must be in r1 as it is used as a parameter later.*/
+        "	mrs r2, psp										\n"/* Read PSP in r2. */
+        "													\n"
+        "	cbz r0, save_ns_context							\n"/* No secure context to save. */
+        "	push {r0-r2, r14}								\n"
+        "	bl SecureContext_SaveContext					\n"/* Params are in r0 and r1. r0 = xSecureContext and r1 = pxCurrentTCB. */
+        "	pop {r0-r3}										\n"/* LR is now in r3. */
+        "	mov lr, r3										\n"/* LR = r3. */
+        "	lsls r1, r3, #25								\n"/* r1 = r3 << 25. Bit[6] of EXC_RETURN is 1 if secure stack was used, 0 if non-secure stack was used to store stack frame. */
+        "	bpl save_ns_context								\n"/* bpl - branch if positive or zero. If r1 >= 0 ==> Bit[6] in EXC_RETURN is 0 i.e. non-secure stack was used. */
+        "	ldr r3, pxCurrentTCBConst						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr r1, [r3]									\n"/* Read pxCurrentTCB. */
+        #if ( configENABLE_MPU == 1 )
+            "	subs r2, r2, #16							\n"/* Make space for xSecureContext, PSPLIM, CONTROL and LR on the stack. */
+            "	str r2, [r1]								\n"/* Save the new top of stack in TCB. */
+            "	mrs r1, psplim								\n"/* r1 = PSPLIM. */
+            "	mrs r3, control								\n"/* r3 = CONTROL. */
+            "	mov r4, lr									\n"/* r4 = LR/EXC_RETURN. */
+            "	stmia r2!, {r0, r1, r3, r4}					\n"/* Store xSecureContext, PSPLIM, CONTROL and LR on the stack. */
+        #else /* configENABLE_MPU */
+            "	subs r2, r2, #12							\n"/* Make space for xSecureContext, PSPLIM and LR on the stack. */
+            "	str r2, [r1]								\n"/* Save the new top of stack in TCB. */
+            "	mrs r1, psplim								\n"/* r1 = PSPLIM. */
+            "	mov r3, lr									\n"/* r3 = LR/EXC_RETURN. */
+            "	stmia r2!, {r0, r1, r3}						\n"/* Store xSecureContext, PSPLIM and LR on the stack. */
+        #endif /* configENABLE_MPU */
+        "	b select_next_task								\n"
+        "													\n"
+        " save_ns_context:									\n"
+        "	ldr r3, pxCurrentTCBConst						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr r1, [r3]									\n"/* Read pxCurrentTCB. */
+        #if ( configENABLE_MPU == 1 )
+            "	subs r2, r2, #48							\n"/* Make space for xSecureContext, PSPLIM, CONTROL, LR and the remaining registers on the stack. */
+            "	str r2, [r1]								\n"/* Save the new top of stack in TCB. */
+            "	adds r2, r2, #16							\n"/* r2 = r2 + 16. */
+            "	stmia r2!, {r4-r7}							\n"/* Store the low registers that are not saved automatically. */
+            "	mov r4, r8									\n"/* r4 = r8. */
+            "	mov r5, r9									\n"/* r5 = r9. */
+            "	mov r6, r10									\n"/* r6 = r10. */
+            "	mov r7, r11									\n"/* r7 = r11. */
+            "	stmia r2!, {r4-r7}							\n"/* Store the high registers that are not saved automatically. */
+            "	mrs r1, psplim								\n"/* r1 = PSPLIM. */
+            "	mrs r3, control								\n"/* r3 = CONTROL. */
+            "	mov r4, lr									\n"/* r4 = LR/EXC_RETURN. */
+            "	subs r2, r2, #48							\n"/* r2 = r2 - 48. */
+            "	stmia r2!, {r0, r1, r3, r4}					\n"/* Store xSecureContext, PSPLIM, CONTROL and LR on the stack. */
+        #else /* configENABLE_MPU */
+            "	subs r2, r2, #44							\n"/* Make space for xSecureContext, PSPLIM, LR and the remaining registers on the stack. */
+            "	str r2, [r1]								\n"/* Save the new top of stack in TCB. */
+            "	mrs r1, psplim								\n"/* r1 = PSPLIM. */
+            "	mov r3, lr									\n"/* r3 = LR/EXC_RETURN. */
+            "	stmia r2!, {r0, r1, r3-r7}					\n"/* Store xSecureContext, PSPLIM, LR and the low registers that are not saved automatically. */
+            "	mov r4, r8									\n"/* r4 = r8. */
+            "	mov r5, r9									\n"/* r5 = r9. */
+            "	mov r6, r10									\n"/* r6 = r10. */
+            "	mov r7, r11									\n"/* r7 = r11. */
+            "	stmia r2!, {r4-r7}							\n"/* Store the high registers that are not saved automatically. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        " select_next_task:									\n"
+        "	cpsid i											\n"
+        "	bl vTaskSwitchContext							\n"
+        "	cpsie i											\n"
+        "													\n"
+        "	ldr r3, pxCurrentTCBConst						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr r1, [r3]									\n"/* Read pxCurrentTCB. */
+        "	ldr r2, [r1]									\n"/* The first item in pxCurrentTCB is the task top of stack. r2 now points to the top of stack. */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	dmb											\n"/* Complete outstanding transfers before disabling MPU. */
+            "	ldr r3, xMPUCTRLConst						\n"/* r3 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r4, [r3]								\n"/* Read the value of MPU_CTRL. */
+            "	movs r5, #1									\n"/* r5 = 1. */
+            "	bics r4, r5									\n"/* r4 = r4 & ~r5 i.e. Clear the bit 0 in r4. */
+            "	str r4, [r3]								\n"/* Disable MPU. */
+            "												\n"
+            "	adds r1, #4									\n"/* r1 = r1 + 4. r1 now points to MAIR0 in TCB. */
+            "	ldr r4, [r1]								\n"/* r4 = *r1 i.e. r4 = MAIR0. */
+            "	ldr r3, xMAIR0Const							\n"/* r3 = 0xe000edc0 [Location of MAIR0]. */
+            "	str r4, [r3]								\n"/* Program MAIR0. */
+            "	ldr r4, xRNRConst							\n"/* r4 = 0xe000ed98 [Location of RNR]. */
+            "	adds r1, #4									\n"/* r1 = r1 + 4. r1 now points to first RBAR in TCB. */
+            "	movs r5, #4									\n"/* r5 = 4. */
+            "	str  r5, [r4]								\n"/* Program RNR = 4. */
+            "	ldmia r1!, {r6,r7}							\n"/* Read first set of RBAR/RLAR from TCB. */
+            "	ldr  r3, xRBARConst							\n"/* r3 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r3!, {r6,r7}							\n"/* Write first set of RBAR/RLAR registers. */
+            "	movs r5, #5									\n"/* r5 = 5. */
+            "	str  r5, [r4]								\n"/* Program RNR = 5. */
+            "	ldmia r1!, {r6,r7}							\n"/* Read second set of RBAR/RLAR from TCB. */
+            "	ldr  r3, xRBARConst							\n"/* r3 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r3!, {r6,r7}							\n"/* Write second set of RBAR/RLAR registers. */
+            "	movs r5, #6									\n"/* r5 = 6. */
+            "	str  r5, [r4]								\n"/* Program RNR = 6. */
+            "	ldmia r1!, {r6,r7}							\n"/* Read third set of RBAR/RLAR from TCB. */
+            "	ldr  r3, xRBARConst							\n"/* r3 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r3!, {r6,r7}							\n"/* Write third set of RBAR/RLAR registers. */
+            "	movs r5, #7									\n"/* r5 = 7. */
+            "	str  r5, [r4]								\n"/* Program RNR = 7. */
+            "	ldmia r1!, {r6,r7}							\n"/* Read fourth set of RBAR/RLAR from TCB. */
+            "	ldr  r3, xRBARConst							\n"/* r3 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r3!, {r6,r7}							\n"/* Write fourth set of RBAR/RLAR registers. */
+            "												\n"
+            "	ldr r3, xMPUCTRLConst						\n"/* r3 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r4, [r3]								\n"/* Read the value of MPU_CTRL. */
+            "	movs r5, #1									\n"/* r5 = 1. */
+            "	orrs r4, r5									\n"/* r4 = r4 | r5 i.e. Set the bit 0 in r4. */
+            "	str r4, [r3]								\n"/* Enable MPU. */
+            "	dsb											\n"/* Force memory writes before continuing. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	ldmia r2!, {r0, r1, r3, r4}					\n"/* Read from stack - r0 = xSecureContext, r1 = PSPLIM, r3 = CONTROL and r4 = LR. */
+            "	msr psplim, r1								\n"/* Restore the PSPLIM register value for the task. */
+            "	msr control, r3								\n"/* Restore the CONTROL register value for the task. */
+            "	mov lr, r4									\n"/* LR = r4. */
+            "	ldr r3, xSecureContextConst					\n"/* Read the location of xSecureContext i.e. &( xSecureContext ). */
+            "	str r0, [r3]								\n"/* Restore the task's xSecureContext. */
+            "	cbz r0, restore_ns_context					\n"/* If there is no secure context for the task, restore the non-secure context. */
+             "	ldr r3, pxCurrentTCBConst					\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+            "	ldr r1, [r3]								\n"/* Read pxCurrentTCB. */
+            "	push {r2, r4}								\n"
+            "	bl SecureContext_LoadContext				\n"/* Restore the secure context. Params are in r0 and r1. r0 = xSecureContext and r1 = pxCurrentTCB. */
+            "	pop {r2, r4}								\n"
+            "	mov lr, r4									\n"/* LR = r4. */
+            "	lsls r1, r4, #25							\n"/* r1 = r4 << 25. Bit[6] of EXC_RETURN is 1 if secure stack was used, 0 if non-secure stack was used to store stack frame. */
+            "	bpl restore_ns_context						\n"/* bpl - branch if positive or zero. If r1 >= 0 ==> Bit[6] in EXC_RETURN is 0 i.e. non-secure stack was used. */
+            "	msr psp, r2									\n"/* Remember the new top of stack for the task. */
+            "	bx lr										\n"
+        #else /* configENABLE_MPU */
+            "	ldmia r2!, {r0, r1, r4}						\n"/* Read from stack - r0 = xSecureContext, r1 = PSPLIM and r4 = LR. */
+            "	msr psplim, r1								\n"/* Restore the PSPLIM register value for the task. */
+            "	mov lr, r4									\n"/* LR = r4. */
+            "	ldr r3, xSecureContextConst					\n"/* Read the location of xSecureContext i.e. &( xSecureContext ). */
+            "	str r0, [r3]								\n"/* Restore the task's xSecureContext. */
+            "	cbz r0, restore_ns_context					\n"/* If there is no secure context for the task, restore the non-secure context. */
+            "	ldr r3, pxCurrentTCBConst					\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+            "	ldr r1, [r3]								\n"/* Read pxCurrentTCB. */
+            "	push {r2, r4}								\n"
+            "	bl SecureContext_LoadContext				\n"/* Restore the secure context. Params are in r0 and r1. r0 = xSecureContext and r1 = pxCurrentTCB. */
+            "	pop {r2, r4}								\n"
+            "	mov lr, r4									\n"/* LR = r4. */
+            "	lsls r1, r4, #25							\n"/* r1 = r4 << 25. Bit[6] of EXC_RETURN is 1 if secure stack was used, 0 if non-secure stack was used to store stack frame. */
+            "	bpl restore_ns_context						\n"/* bpl - branch if positive or zero. If r1 >= 0 ==> Bit[6] in EXC_RETURN is 0 i.e. non-secure stack was used. */
+            "	msr psp, r2									\n"/* Remember the new top of stack for the task. */
+            "	bx lr										\n"
+        #endif /* configENABLE_MPU */
+        "													\n"
+        " restore_ns_context:								\n"
+        "	adds r2, r2, #16								\n"/* Move to the high registers. */
+        "	ldmia r2!, {r4-r7}								\n"/* Restore the high registers that are not automatically restored. */
+        "	mov r8, r4										\n"/* r8 = r4. */
+        "	mov r9, r5										\n"/* r9 = r5. */
+        "	mov r10, r6										\n"/* r10 = r6. */
+        "	mov r11, r7										\n"/* r11 = r7. */
+        "	msr psp, r2										\n"/* Remember the new top of stack for the task. */
+        "	subs r2, r2, #32								\n"/* Go back to the low registers. */
+        "	ldmia r2!, {r4-r7}								\n"/* Restore the low registers that are not automatically restored. */
+        "	bx lr											\n"
+        "													\n"
+        "	.align 4										\n"
+        "pxCurrentTCBConst: .word pxCurrentTCB				\n"
+        "xSecureContextConst: .word xSecureContext			\n"
+        #if ( configENABLE_MPU == 1 )
+            "xMPUCTRLConst: .word 0xe000ed94				\n"
+            "xMAIR0Const: .word 0xe000edc0					\n"
+            "xRNRConst: .word 0xe000ed98					\n"
+            "xRBARConst: .word 0xe000ed9c					\n"
+        #endif /* configENABLE_MPU */
+    );
+}
+/*-----------------------------------------------------------*/
+
+void SVC_Handler( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	movs r0, #4										\n"
+        "	mov r1, lr										\n"
+        "	tst r0, r1										\n"
+        "	beq stacking_used_msp							\n"
+        "	mrs r0, psp										\n"
+        "	ldr r2, svchandler_address_const				\n"
+        "	bx r2											\n"
+        " stacking_used_msp:								\n"
+        "	mrs r0, msp										\n"
+        "	ldr r2, svchandler_address_const				\n"
+        "	bx r2											\n"
+        "													\n"
+        "	.align 4										\n"
+        "svchandler_address_const: .word vPortSVCHandler_C	\n"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vPortAllocateSecureContext( uint32_t ulSecureStackSize ) /* __attribute__ (( naked )) */
+{
+    __asm volatile
+    (
+        "	svc %0											\n"/* Secure context is allocated in the supervisor call. */
+        "	bx lr											\n"/* Return. */
+        ::"i" ( portSVC_ALLOCATE_SECURE_CONTEXT ) : "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vPortFreeSecureContext( uint32_t * pulTCB ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	ldr r2, [r0]									\n"/* The first item in the TCB is the top of the stack. */
+        "	ldr r1, [r2]									\n"/* The first item on the stack is the task's xSecureContext. */
+        "	cmp r1, #0										\n"/* Raise svc if task's xSecureContext is not NULL. */
+        "	bne free_secure_context							\n"/* Branch if r1 != 0. */
+        "	bx lr											\n"/* There is no secure context (xSecureContext is NULL). */
+        " free_secure_context:								\n"
+        "	svc %0											\n"/* Secure context is freed in the supervisor call. */
+        "	bx lr											\n"/* Return. */
+        ::"i" ( portSVC_FREE_SECURE_CONTEXT ) : "memory"
+    );
+}
+/*-----------------------------------------------------------*/

freertos/Source/portable/ARMv8M/non_secure/portable/GCC/ARM_CM23/portmacro.h

@@ -0,0 +1,310 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef PORTMACRO_H
+    #define PORTMACRO_H
+
+    #ifdef __cplusplus
+        extern "C" {
+    #endif
+
+/*------------------------------------------------------------------------------
+ * Port specific definitions.
+ *
+ * The settings in this file configure FreeRTOS correctly for the given hardware
+ * and compiler.
+ *
+ * These settings should not be altered.
+ *------------------------------------------------------------------------------
+ */
+
+    #ifndef configENABLE_FPU
+        #error configENABLE_FPU must be defined in FreeRTOSConfig.h.  Set configENABLE_FPU to 1 to enable the FPU or 0 to disable the FPU.
+    #endif /* configENABLE_FPU */
+
+    #ifndef configENABLE_MPU
+        #error configENABLE_MPU must be defined in FreeRTOSConfig.h.  Set configENABLE_MPU to 1 to enable the MPU or 0 to disable the MPU.
+    #endif /* configENABLE_MPU */
+
+    #ifndef configENABLE_TRUSTZONE
+        #error configENABLE_TRUSTZONE must be defined in FreeRTOSConfig.h.  Set configENABLE_TRUSTZONE to 1 to enable TrustZone or 0 to disable TrustZone.
+    #endif /* configENABLE_TRUSTZONE */
+
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Type definitions.
+ */
+    #define portCHAR          char
+    #define portFLOAT         float
+    #define portDOUBLE        double
+    #define portLONG          long
+    #define portSHORT         short
+    #define portSTACK_TYPE    uint32_t
+    #define portBASE_TYPE     long
+
+    typedef portSTACK_TYPE   StackType_t;
+    typedef long             BaseType_t;
+    typedef unsigned long    UBaseType_t;
+
+    #if ( configUSE_16_BIT_TICKS == 1 )
+        typedef uint16_t     TickType_t;
+        #define portMAX_DELAY              ( TickType_t ) 0xffff
+    #else
+        typedef uint32_t     TickType_t;
+        #define portMAX_DELAY              ( TickType_t ) 0xffffffffUL
+
+/* 32-bit tick type on a 32-bit architecture, so reads of the tick count do
+ * not need to be guarded with a critical section. */
+        #define portTICK_TYPE_IS_ATOMIC    1
+    #endif
+/*-----------------------------------------------------------*/
+
+/**
+ * Architecture specifics.
+ */
+    #define portARCH_NAME                      "Cortex-M23"
+    #define portSTACK_GROWTH                   ( -1 )
+    #define portTICK_PERIOD_MS                 ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
+    #define portBYTE_ALIGNMENT                 8
+    #define portNOP()
+    #define portINLINE                         __inline
+    #ifndef portFORCE_INLINE
+        #define portFORCE_INLINE               inline __attribute__( ( always_inline ) )
+    #endif
+    #define portHAS_STACK_OVERFLOW_CHECKING    1
+    #define portDONT_DISCARD                   __attribute__( ( used ) )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Extern declarations.
+ */
+    extern BaseType_t xPortIsInsideInterrupt( void );
+
+    extern void vPortYield( void ) /* PRIVILEGED_FUNCTION */;
+
+    extern void vPortEnterCritical( void ) /* PRIVILEGED_FUNCTION */;
+    extern void vPortExitCritical( void ) /* PRIVILEGED_FUNCTION */;
+
+    extern uint32_t ulSetInterruptMask( void ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */;
+    extern void vClearInterruptMask( uint32_t ulMask ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */;
+
+    #if ( configENABLE_TRUSTZONE == 1 )
+        extern void vPortAllocateSecureContext( uint32_t ulSecureStackSize ); /* __attribute__ (( naked )) */
+        extern void vPortFreeSecureContext( uint32_t * pulTCB ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */;
+    #endif /* configENABLE_TRUSTZONE */
+
+    #if ( configENABLE_MPU == 1 )
+        extern BaseType_t xIsPrivileged( void ) /* __attribute__ (( naked )) */;
+        extern void vResetPrivilege( void ) /* __attribute__ (( naked )) */;
+    #endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief MPU specific constants.
+ */
+    #if ( configENABLE_MPU == 1 )
+        #define portUSING_MPU_WRAPPERS    1
+        #define portPRIVILEGE_BIT         ( 0x80000000UL )
+    #else
+        #define portPRIVILEGE_BIT         ( 0x0UL )
+    #endif /* configENABLE_MPU */
+
+
+/* MPU regions. */
+    #define portPRIVILEGED_FLASH_REGION                   ( 0UL )
+    #define portUNPRIVILEGED_FLASH_REGION                 ( 1UL )
+    #define portUNPRIVILEGED_SYSCALLS_REGION              ( 2UL )
+    #define portPRIVILEGED_RAM_REGION                     ( 3UL )
+    #define portSTACK_REGION                              ( 4UL )
+    #define portFIRST_CONFIGURABLE_REGION                 ( 5UL )
+    #define portLAST_CONFIGURABLE_REGION                  ( 7UL )
+    #define portNUM_CONFIGURABLE_REGIONS                  ( ( portLAST_CONFIGURABLE_REGION - portFIRST_CONFIGURABLE_REGION ) + 1 )
+    #define portTOTAL_NUM_REGIONS                         ( portNUM_CONFIGURABLE_REGIONS + 1 )   /* Plus one to make space for the stack region. */
+
+/* Device memory attributes used in MPU_MAIR registers.
+ *
+ * 8-bit values encoded as follows:
+ *  Bit[7:4] - 0000 - Device Memory
+ *  Bit[3:2] - 00 --> Device-nGnRnE
+ *				01 --> Device-nGnRE
+ *				10 --> Device-nGRE
+ *				11 --> Device-GRE
+ *  Bit[1:0] - 00, Reserved.
+ */
+    #define portMPU_DEVICE_MEMORY_nGnRnE                  ( 0x00 )   /* 0000 0000 */
+    #define portMPU_DEVICE_MEMORY_nGnRE                   ( 0x04 )   /* 0000 0100 */
+    #define portMPU_DEVICE_MEMORY_nGRE                    ( 0x08 )   /* 0000 1000 */
+    #define portMPU_DEVICE_MEMORY_GRE                     ( 0x0C )   /* 0000 1100 */
+
+/* Normal memory attributes used in MPU_MAIR registers. */
+    #define portMPU_NORMAL_MEMORY_NON_CACHEABLE           ( 0x44 )   /* Non-cacheable. */
+    #define portMPU_NORMAL_MEMORY_BUFFERABLE_CACHEABLE    ( 0xFF )   /* Non-Transient, Write-back, Read-Allocate and Write-Allocate. */
+
+/* Attributes used in MPU_RBAR registers. */
+    #define portMPU_REGION_NON_SHAREABLE                  ( 0UL << 3UL )
+    #define portMPU_REGION_INNER_SHAREABLE                ( 1UL << 3UL )
+    #define portMPU_REGION_OUTER_SHAREABLE                ( 2UL << 3UL )
+
+    #define portMPU_REGION_PRIVILEGED_READ_WRITE          ( 0UL << 1UL )
+    #define portMPU_REGION_READ_WRITE                     ( 1UL << 1UL )
+    #define portMPU_REGION_PRIVILEGED_READ_ONLY           ( 2UL << 1UL )
+    #define portMPU_REGION_READ_ONLY                      ( 3UL << 1UL )
+
+    #define portMPU_REGION_EXECUTE_NEVER                  ( 1UL )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Settings to define an MPU region.
+ */
+    typedef struct MPURegionSettings
+    {
+        uint32_t ulRBAR; /**< RBAR for the region. */
+        uint32_t ulRLAR; /**< RLAR for the region. */
+    } MPURegionSettings_t;
+
+/**
+ * @brief MPU settings as stored in the TCB.
+ */
+    typedef struct MPU_SETTINGS
+    {
+        uint32_t ulMAIR0;                                              /**< MAIR0 for the task containing attributes for all the 4 per task regions. */
+        MPURegionSettings_t xRegionsSettings[ portTOTAL_NUM_REGIONS ]; /**< Settings for 4 per task regions. */
+    } xMPU_SETTINGS;
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief SVC numbers.
+ */
+    #define portSVC_ALLOCATE_SECURE_CONTEXT    0
+    #define portSVC_FREE_SECURE_CONTEXT        1
+    #define portSVC_START_SCHEDULER            2
+    #define portSVC_RAISE_PRIVILEGE            3
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Scheduler utilities.
+ */
+    #define portYIELD()                                 vPortYield()
+    #define portNVIC_INT_CTRL_REG     ( *( ( volatile uint32_t * ) 0xe000ed04 ) )
+    #define portNVIC_PENDSVSET_BIT    ( 1UL << 28UL )
+    #define portEND_SWITCHING_ISR( xSwitchRequired )    do { if( xSwitchRequired ) portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT; } while( 0 )
+    #define portYIELD_FROM_ISR( x )                     portEND_SWITCHING_ISR( x )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Critical section management.
+ */
+    #define portSET_INTERRUPT_MASK_FROM_ISR()         ulSetInterruptMask()
+    #define portCLEAR_INTERRUPT_MASK_FROM_ISR( x )    vClearInterruptMask( x )
+    #define portDISABLE_INTERRUPTS()                  __asm volatile ( " cpsid i " ::: "memory" )
+    #define portENABLE_INTERRUPTS()                   __asm volatile ( " cpsie i " ::: "memory" )
+    #define portENTER_CRITICAL()                      vPortEnterCritical()
+    #define portEXIT_CRITICAL()                       vPortExitCritical()
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Tickless idle/low power functionality.
+ */
+    #ifndef portSUPPRESS_TICKS_AND_SLEEP
+        extern void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime );
+        #define portSUPPRESS_TICKS_AND_SLEEP( xExpectedIdleTime )    vPortSuppressTicksAndSleep( xExpectedIdleTime )
+    #endif
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Task function macros as described on the FreeRTOS.org WEB site.
+ */
+    #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
+    #define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )
+/*-----------------------------------------------------------*/
+
+    #if ( configENABLE_TRUSTZONE == 1 )
+
+/**
+ * @brief Allocate a secure context for the task.
+ *
+ * Tasks are not created with a secure context. Any task that is going to call
+ * secure functions must call portALLOCATE_SECURE_CONTEXT() to allocate itself a
+ * secure context before it calls any secure function.
+ *
+ * @param[in] ulSecureStackSize The size of the secure stack to be allocated.
+ */
+        #define portALLOCATE_SECURE_CONTEXT( ulSecureStackSize )    vPortAllocateSecureContext( ulSecureStackSize )
+
+/**
+ * @brief Called when a task is deleted to delete the task's secure context,
+ * if it has one.
+ *
+ * @param[in] pxTCB The TCB of the task being deleted.
+ */
+        #define portCLEAN_UP_TCB( pxTCB )                           vPortFreeSecureContext( ( uint32_t * ) pxTCB )
+    #endif /* configENABLE_TRUSTZONE */
+/*-----------------------------------------------------------*/
+
+    #if ( configENABLE_MPU == 1 )
+
+/**
+ * @brief Checks whether or not the processor is privileged.
+ *
+ * @return 1 if the processor is already privileged, 0 otherwise.
+ */
+        #define portIS_PRIVILEGED()      xIsPrivileged()
+
+/**
+ * @brief Raise an SVC request to raise privilege.
+ *
+ * The SVC handler checks that the SVC was raised from a system call and only
+ * then it raises the privilege. If this is called from any other place,
+ * the privilege is not raised.
+ */
+        #define portRAISE_PRIVILEGE()    __asm volatile ( "svc %0 \n" ::"i" ( portSVC_RAISE_PRIVILEGE ) : "memory" );
+
+/**
+ * @brief Lowers the privilege level by setting the bit 0 of the CONTROL
+ * register.
+ */
+        #define portRESET_PRIVILEGE()    vResetPrivilege()
+    #else
+        #define portIS_PRIVILEGED()
+        #define portRAISE_PRIVILEGE()
+        #define portRESET_PRIVILEGE()
+    #endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Barriers.
+ */
+    #define portMEMORY_BARRIER()    __asm volatile ( "" ::: "memory" )
+/*-----------------------------------------------------------*/
+
+    #ifdef __cplusplus
+        }
+    #endif
+
+#endif /* PORTMACRO_H */

freertos/Source/portable/ARMv8M/non_secure/portable/GCC/ARM_CM23_NTZ/portasm.c

@@ -0,0 +1,367 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+/* Standard includes. */
+#include <stdint.h>
+
+/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE ensures that PRIVILEGED_FUNCTION
+ * is defined correctly and privileged functions are placed in correct sections. */
+#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+/* Portasm includes. */
+#include "portasm.h"
+
+/* MPU_WRAPPERS_INCLUDED_FROM_API_FILE is needed to be defined only for the
+ * header files. */
+#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+#if ( configENABLE_FPU == 1 )
+    #error Cortex-M23 does not have a Floating Point Unit (FPU) and therefore configENABLE_FPU must be set to 0.
+#endif
+
+void vRestoreContextOfFirstTask( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	.syntax unified									\n"
+        "													\n"
+        "	ldr  r2, pxCurrentTCBConst2						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr  r1, [r2]									\n"/* Read pxCurrentTCB. */
+        "	ldr  r0, [r1]									\n"/* Read top of stack from TCB - The first item in pxCurrentTCB is the task top of stack. */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	dmb												\n"/* Complete outstanding transfers before disabling MPU. */
+            "	ldr r2, xMPUCTRLConst2							\n"/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r3, [r2]									\n"/* Read the value of MPU_CTRL. */
+            "	movs r4, #1										\n"/* r4 = 1. */
+            "	bics r3, r4										\n"/* r3 = r3 & ~r4 i.e. Clear the bit 0 in r3. */
+            "	str r3, [r2]									\n"/* Disable MPU. */
+            "													\n"
+            "	adds r1, #4										\n"/* r1 = r1 + 4. r1 now points to MAIR0 in TCB. */
+            "	ldr  r4, [r1]									\n"/* r4 = *r1 i.e. r4 = MAIR0. */
+            "	ldr  r2, xMAIR0Const2							\n"/* r2 = 0xe000edc0 [Location of MAIR0]. */
+            "	str  r4, [r2]									\n"/* Program MAIR0. */
+            "	ldr  r2, xRNRConst2								\n"/* r2 = 0xe000ed98 [Location of RNR]. */
+            "	adds r1, #4										\n"/* r1 = r1 + 4. r1 now points to first RBAR in TCB. */
+            "	movs r4, #4										\n"/* r4 = 4. */
+            "	str  r4, [r2]									\n"/* Program RNR = 4. */
+            "	ldmia r1!, {r5,r6}								\n"/* Read first set of RBAR/RLAR from TCB. */
+            "	ldr  r3, xRBARConst2							\n"/* r3 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r3!, {r5,r6}								\n"/* Write first set of RBAR/RLAR registers. */
+            "	movs r4, #5										\n"/* r4 = 5. */
+            "	str  r4, [r2]									\n"/* Program RNR = 5. */
+            "	ldmia r1!, {r5,r6}								\n"/* Read second set of RBAR/RLAR from TCB. */
+            "	ldr  r3, xRBARConst2							\n"/* r3 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r3!, {r5,r6}								\n"/* Write second set of RBAR/RLAR registers. */
+            "	movs r4, #6										\n"/* r4 = 6. */
+            "	str  r4, [r2]									\n"/* Program RNR = 6. */
+            "	ldmia r1!, {r5,r6}								\n"/* Read third set of RBAR/RLAR from TCB. */
+            "	ldr  r3, xRBARConst2							\n"/* r3 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r3!, {r5,r6}								\n"/* Write third set of RBAR/RLAR registers. */
+            "	movs r4, #7										\n"/* r4 = 7. */
+            "	str  r4, [r2]									\n"/* Program RNR = 7. */
+            "	ldmia r1!, {r5,r6}								\n"/* Read fourth set of RBAR/RLAR from TCB. */
+            "	ldr  r3, xRBARConst2							\n"/* r3 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r3!, {r5,r6}								\n"/* Write fourth set of RBAR/RLAR registers. */
+            "													\n"
+            "	ldr r2, xMPUCTRLConst2							\n"/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r3, [r2]									\n"/* Read the value of MPU_CTRL. */
+            "	movs r4, #1										\n"/* r4 = 1. */
+            "	orrs r3, r4										\n"/* r3 = r3 | r4 i.e. Set the bit 0 in r3. */
+            "	str r3, [r2]									\n"/* Enable MPU. */
+            "	dsb												\n"/* Force memory writes before continuing. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	ldm  r0!, {r1-r3}								\n"/* Read from stack - r1 = PSPLIM, r2 = CONTROL and r3 = EXC_RETURN. */
+            "	msr  psplim, r1									\n"/* Set this task's PSPLIM value. */
+            "	msr  control, r2								\n"/* Set this task's CONTROL value. */
+            "	adds r0, #32									\n"/* Discard everything up to r0. */
+            "	msr  psp, r0									\n"/* This is now the new top of stack to use in the task. */
+            "	isb												\n"
+            "	bx   r3											\n"/* Finally, branch to EXC_RETURN. */
+        #else /* configENABLE_MPU */
+            "	ldm  r0!, {r1-r2}								\n"/* Read from stack - r1 = PSPLIM and r2 = EXC_RETURN. */
+            "	msr  psplim, r1									\n"/* Set this task's PSPLIM value. */
+            "	movs r1, #2										\n"/* r1 = 2. */
+            "	msr  CONTROL, r1								\n"/* Switch to use PSP in the thread mode. */
+            "	adds r0, #32									\n"/* Discard everything up to r0. */
+            "	msr  psp, r0									\n"/* This is now the new top of stack to use in the task. */
+            "	isb												\n"
+            "	bx   r2											\n"/* Finally, branch to EXC_RETURN. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        "	.align 4										\n"
+        "pxCurrentTCBConst2: .word pxCurrentTCB				\n"
+        #if ( configENABLE_MPU == 1 )
+            "xMPUCTRLConst2: .word 0xe000ed94					\n"
+            "xMAIR0Const2: .word 0xe000edc0						\n"
+            "xRNRConst2: .word 0xe000ed98						\n"
+            "xRBARConst2: .word 0xe000ed9c						\n"
+        #endif /* configENABLE_MPU */
+    );
+}
+/*-----------------------------------------------------------*/
+
+BaseType_t xIsPrivileged( void ) /* __attribute__ (( naked )) */
+{
+    __asm volatile
+    (
+        "	mrs r0, control									\n"/* r0 = CONTROL. */
+        "	movs r1, #1										\n"/* r1 = 1. */
+        "	tst r0, r1										\n"/* Perform r0 & r1 (bitwise AND) and update the conditions flag. */
+        "	beq running_privileged							\n"/* If the result of previous AND operation was 0, branch. */
+        "	movs r0, #0										\n"/* CONTROL[0]!=0. Return false to indicate that the processor is not privileged. */
+        "	bx lr											\n"/* Return. */
+        " running_privileged:								\n"
+        "	movs r0, #1										\n"/* CONTROL[0]==0. Return true to indicate that the processor is privileged. */
+        "	bx lr											\n"/* Return. */
+        "													\n"
+        "	.align 4										\n"
+        ::: "r0", "r1", "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vRaisePrivilege( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	mrs  r0, control								\n"/* Read the CONTROL register. */
+        "	movs r1, #1										\n"/* r1 = 1. */
+        "	bics r0, r1										\n"/* Clear the bit 0. */
+        "	msr  control, r0								\n"/* Write back the new CONTROL value. */
+        "	bx lr											\n"/* Return to the caller. */
+        ::: "r0", "r1", "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vResetPrivilege( void ) /* __attribute__ (( naked )) */
+{
+    __asm volatile
+    (
+        "	mrs r0, control									\n"/* r0 = CONTROL. */
+        "	movs r1, #1										\n"/* r1 = 1. */
+        "	orrs r0, r1										\n"/* r0 = r0 | r1. */
+        "	msr control, r0									\n"/* CONTROL = r0. */
+        "	bx lr											\n"/* Return to the caller. */
+        ::: "r0", "r1", "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vStartFirstTask( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	ldr r0, xVTORConst								\n"/* Use the NVIC offset register to locate the stack. */
+        "	ldr r0, [r0]									\n"/* Read the VTOR register which gives the address of vector table. */
+        "	ldr r0, [r0]									\n"/* The first entry in vector table is stack pointer. */
+        "	msr msp, r0										\n"/* Set the MSP back to the start of the stack. */
+        "	cpsie i											\n"/* Globally enable interrupts. */
+        "	dsb												\n"
+        "	isb												\n"
+        "	svc %0											\n"/* System call to start the first task. */
+        "	nop												\n"
+        "													\n"
+        "   .align 4										\n"
+        "xVTORConst: .word 0xe000ed08						\n"
+        ::"i" ( portSVC_START_SCHEDULER ) : "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+uint32_t ulSetInterruptMask( void ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	mrs r0, PRIMASK									\n"
+        "	cpsid i											\n"
+        "	bx lr											\n"
+        ::: "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vClearInterruptMask( __attribute__( ( unused ) ) uint32_t ulMask ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	msr PRIMASK, r0									\n"
+        "	bx lr											\n"
+        ::: "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void PendSV_Handler( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	.syntax unified									\n"
+        "													\n"
+        "	mrs r0, psp										\n"/* Read PSP in r0. */
+        "	ldr r2, pxCurrentTCBConst						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr r1, [r2]									\n"/* Read pxCurrentTCB. */
+        #if ( configENABLE_MPU == 1 )
+            "	subs r0, r0, #44								\n"/* Make space for PSPLIM, CONTROL, LR and the remaining registers on the stack. */
+            "	str r0, [r1]									\n"/* Save the new top of stack in TCB. */
+            "	mrs r1, psplim									\n"/* r1 = PSPLIM. */
+            "	mrs r2, control									\n"/* r2 = CONTROL. */
+            "	mov r3, lr										\n"/* r3 = LR/EXC_RETURN. */
+            "	stmia r0!, {r1-r7}								\n"/* Store on the stack - PSPLIM, CONTROL, LR and low registers that are not automatically saved. */
+            "	mov r4, r8										\n"/* r4 = r8. */
+            "	mov r5, r9										\n"/* r5 = r9. */
+            "	mov r6, r10										\n"/* r6 = r10. */
+            "	mov r7, r11										\n"/* r7 = r11. */
+            "	stmia r0!, {r4-r7}								\n"/* Store the high registers that are not saved automatically. */
+        #else /* configENABLE_MPU */
+            "	subs r0, r0, #40								\n"/* Make space for PSPLIM, LR and the remaining registers on the stack. */
+            "	str r0, [r1]									\n"/* Save the new top of stack in TCB. */
+            "	mrs r2, psplim									\n"/* r2 = PSPLIM. */
+            "	mov r3, lr										\n"/* r3 = LR/EXC_RETURN. */
+            "	stmia r0!, {r2-r7}								\n"/* Store on the stack - PSPLIM, LR and low registers that are not automatically saved. */
+            "	mov r4, r8										\n"/* r4 = r8. */
+            "	mov r5, r9										\n"/* r5 = r9. */
+            "	mov r6, r10										\n"/* r6 = r10. */
+            "	mov r7, r11										\n"/* r7 = r11. */
+            "	stmia r0!, {r4-r7}								\n"/* Store the high registers that are not saved automatically. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        "	cpsid i											\n"
+        "	bl vTaskSwitchContext							\n"
+        "	cpsie i											\n"
+        "													\n"
+        "	ldr r2, pxCurrentTCBConst						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr r1, [r2]									\n"/* Read pxCurrentTCB. */
+        "	ldr r0, [r1]									\n"/* The first item in pxCurrentTCB is the task top of stack. r0 now points to the top of stack. */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	dmb												\n"/* Complete outstanding transfers before disabling MPU. */
+            "	ldr r2, xMPUCTRLConst							\n"/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r3, [r2]									\n"/* Read the value of MPU_CTRL. */
+            "	movs r4, #1										\n"/* r4 = 1. */
+            "	bics r3, r4										\n"/* r3 = r3 & ~r4 i.e. Clear the bit 0 in r3. */
+            "	str r3, [r2]									\n"/* Disable MPU. */
+            "													\n"
+            "	adds r1, #4										\n"/* r1 = r1 + 4. r1 now points to MAIR0 in TCB. */
+            "	ldr  r4, [r1]									\n"/* r4 = *r1 i.e. r4 = MAIR0. */
+            "	ldr  r2, xMAIR0Const							\n"/* r2 = 0xe000edc0 [Location of MAIR0]. */
+            "	str  r4, [r2]									\n"/* Program MAIR0. */
+            "	ldr  r2, xRNRConst								\n"/* r2 = 0xe000ed98 [Location of RNR]. */
+            "	adds r1, #4										\n"/* r1 = r1 + 4. r1 now points to first RBAR in TCB. */
+            "	movs r4, #4										\n"/* r4 = 4. */
+            "	str  r4, [r2]									\n"/* Program RNR = 4. */
+            "	ldmia r1!, {r5,r6}								\n"/* Read first set of RBAR/RLAR from TCB. */
+            "	ldr  r3, xRBARConst								\n"/* r3 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r3!, {r5,r6}								\n"/* Write first set of RBAR/RLAR registers. */
+            "	movs r4, #5										\n"/* r4 = 5. */
+            "	str  r4, [r2]									\n"/* Program RNR = 5. */
+            "	ldmia r1!, {r5,r6}								\n"/* Read second set of RBAR/RLAR from TCB. */
+            "	ldr  r3, xRBARConst								\n"/* r3 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r3!, {r5,r6}								\n"/* Write second set of RBAR/RLAR registers. */
+            "	movs r4, #6										\n"/* r4 = 6. */
+            "	str  r4, [r2]									\n"/* Program RNR = 6. */
+            "	ldmia r1!, {r5,r6}								\n"/* Read third set of RBAR/RLAR from TCB. */
+            "	ldr  r3, xRBARConst								\n"/* r3 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r3!, {r5,r6}								\n"/* Write third set of RBAR/RLAR registers. */
+            "	movs r4, #7										\n"/* r4 = 7. */
+            "	str  r4, [r2]									\n"/* Program RNR = 7. */
+            "	ldmia r1!, {r5,r6}								\n"/* Read fourth set of RBAR/RLAR from TCB. */
+            "	ldr  r3, xRBARConst								\n"/* r3 = 0xe000ed9c [Location of RBAR]. */
+            "	stmia r3!, {r5,r6}								\n"/* Write fourth set of RBAR/RLAR registers. */
+            "													\n"
+            "	ldr r2, xMPUCTRLConst							\n"/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r3, [r2]									\n"/* Read the value of MPU_CTRL. */
+            "	movs r4, #1										\n"/* r4 = 1. */
+            "	orrs r3, r4										\n"/* r3 = r3 | r4 i.e. Set the bit 0 in r3. */
+            "	str r3, [r2]									\n"/* Enable MPU. */
+            "	dsb												\n"/* Force memory writes before continuing. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	adds r0, r0, #28								\n"/* Move to the high registers. */
+            "	ldmia r0!, {r4-r7}								\n"/* Restore the high registers that are not automatically restored. */
+            "	mov r8, r4										\n"/* r8 = r4. */
+            "	mov r9, r5										\n"/* r9 = r5. */
+            "	mov r10, r6										\n"/* r10 = r6. */
+            "	mov r11, r7										\n"/* r11 = r7. */
+            "	msr psp, r0										\n"/* Remember the new top of stack for the task. */
+            "	subs r0, r0, #44								\n"/* Move to the starting of the saved context. */
+            "	ldmia r0!, {r1-r7}								\n"/* Read from stack - r1 = PSPLIM, r2 = CONTROL, r3 = LR and r4-r7 restored. */
+            "	msr psplim, r1									\n"/* Restore the PSPLIM register value for the task. */
+            "	msr control, r2									\n"/* Restore the CONTROL register value for the task. */
+            "	bx r3											\n"
+        #else /* configENABLE_MPU */
+            "	adds r0, r0, #24								\n"/* Move to the high registers. */
+            "	ldmia r0!, {r4-r7}								\n"/* Restore the high registers that are not automatically restored. */
+            "	mov r8, r4										\n"/* r8 = r4. */
+            "	mov r9, r5										\n"/* r9 = r5. */
+            "	mov r10, r6										\n"/* r10 = r6. */
+            "	mov r11, r7										\n"/* r11 = r7. */
+            "	msr psp, r0										\n"/* Remember the new top of stack for the task. */
+            "	subs r0, r0, #40								\n"/* Move to the starting of the saved context. */
+            "	ldmia r0!, {r2-r7}								\n"/* Read from stack - r2 = PSPLIM, r3 = LR and r4-r7 restored. */
+            "	msr psplim, r2									\n"/* Restore the PSPLIM register value for the task. */
+            "	bx r3											\n"
+        #endif /* configENABLE_MPU */
+        "													\n"
+        "	.align 4										\n"
+        "pxCurrentTCBConst: .word pxCurrentTCB				\n"
+        #if ( configENABLE_MPU == 1 )
+            "xMPUCTRLConst: .word 0xe000ed94					\n"
+            "xMAIR0Const: .word 0xe000edc0						\n"
+            "xRNRConst: .word 0xe000ed98						\n"
+            "xRBARConst: .word 0xe000ed9c						\n"
+        #endif /* configENABLE_MPU */
+    );
+}
+/*-----------------------------------------------------------*/
+
+void SVC_Handler( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	movs r0, #4										\n"
+        "	mov r1, lr										\n"
+        "	tst r0, r1										\n"
+        "	beq stacking_used_msp							\n"
+        "	mrs r0, psp										\n"
+        "	ldr r2, svchandler_address_const				\n"
+        "	bx r2											\n"
+        " stacking_used_msp:								\n"
+        "	mrs r0, msp										\n"
+        "	ldr r2, svchandler_address_const				\n"
+        "	bx r2											\n"
+        "													\n"
+        "	.align 4										\n"
+        "svchandler_address_const: .word vPortSVCHandler_C	\n"
+    );
+}
+/*-----------------------------------------------------------*/

freertos/Source/portable/ARMv8M/non_secure/portable/GCC/ARM_CM23_NTZ/portmacro.h

@@ -0,0 +1,310 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef PORTMACRO_H
+    #define PORTMACRO_H
+
+    #ifdef __cplusplus
+        extern "C" {
+    #endif
+
+/*------------------------------------------------------------------------------
+ * Port specific definitions.
+ *
+ * The settings in this file configure FreeRTOS correctly for the given hardware
+ * and compiler.
+ *
+ * These settings should not be altered.
+ *------------------------------------------------------------------------------
+ */
+
+    #ifndef configENABLE_FPU
+        #error configENABLE_FPU must be defined in FreeRTOSConfig.h.  Set configENABLE_FPU to 1 to enable the FPU or 0 to disable the FPU.
+    #endif /* configENABLE_FPU */
+
+    #ifndef configENABLE_MPU
+        #error configENABLE_MPU must be defined in FreeRTOSConfig.h.  Set configENABLE_MPU to 1 to enable the MPU or 0 to disable the MPU.
+    #endif /* configENABLE_MPU */
+
+    #ifndef configENABLE_TRUSTZONE
+        #error configENABLE_TRUSTZONE must be defined in FreeRTOSConfig.h.  Set configENABLE_TRUSTZONE to 1 to enable TrustZone or 0 to disable TrustZone.
+    #endif /* configENABLE_TRUSTZONE */
+
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Type definitions.
+ */
+    #define portCHAR          char
+    #define portFLOAT         float
+    #define portDOUBLE        double
+    #define portLONG          long
+    #define portSHORT         short
+    #define portSTACK_TYPE    uint32_t
+    #define portBASE_TYPE     long
+
+    typedef portSTACK_TYPE   StackType_t;
+    typedef long             BaseType_t;
+    typedef unsigned long    UBaseType_t;
+
+    #if ( configUSE_16_BIT_TICKS == 1 )
+        typedef uint16_t     TickType_t;
+        #define portMAX_DELAY              ( TickType_t ) 0xffff
+    #else
+        typedef uint32_t     TickType_t;
+        #define portMAX_DELAY              ( TickType_t ) 0xffffffffUL
+
+/* 32-bit tick type on a 32-bit architecture, so reads of the tick count do
+ * not need to be guarded with a critical section. */
+        #define portTICK_TYPE_IS_ATOMIC    1
+    #endif
+/*-----------------------------------------------------------*/
+
+/**
+ * Architecture specifics.
+ */
+    #define portARCH_NAME                      "Cortex-M23"
+    #define portSTACK_GROWTH                   ( -1 )
+    #define portTICK_PERIOD_MS                 ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
+    #define portBYTE_ALIGNMENT                 8
+    #define portNOP()
+    #define portINLINE                         __inline
+    #ifndef portFORCE_INLINE
+        #define portFORCE_INLINE               inline __attribute__( ( always_inline ) )
+    #endif
+    #define portHAS_STACK_OVERFLOW_CHECKING    1
+    #define portDONT_DISCARD                   __attribute__( ( used ) )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Extern declarations.
+ */
+    extern BaseType_t xPortIsInsideInterrupt( void );
+
+    extern void vPortYield( void ) /* PRIVILEGED_FUNCTION */;
+
+    extern void vPortEnterCritical( void ) /* PRIVILEGED_FUNCTION */;
+    extern void vPortExitCritical( void ) /* PRIVILEGED_FUNCTION */;
+
+    extern uint32_t ulSetInterruptMask( void ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */;
+    extern void vClearInterruptMask( uint32_t ulMask ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */;
+
+    #if ( configENABLE_TRUSTZONE == 1 )
+        extern void vPortAllocateSecureContext( uint32_t ulSecureStackSize ); /* __attribute__ (( naked )) */
+        extern void vPortFreeSecureContext( uint32_t * pulTCB ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */;
+    #endif /* configENABLE_TRUSTZONE */
+
+    #if ( configENABLE_MPU == 1 )
+        extern BaseType_t xIsPrivileged( void ) /* __attribute__ (( naked )) */;
+        extern void vResetPrivilege( void ) /* __attribute__ (( naked )) */;
+    #endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief MPU specific constants.
+ */
+    #if ( configENABLE_MPU == 1 )
+        #define portUSING_MPU_WRAPPERS    1
+        #define portPRIVILEGE_BIT         ( 0x80000000UL )
+    #else
+        #define portPRIVILEGE_BIT         ( 0x0UL )
+    #endif /* configENABLE_MPU */
+
+
+/* MPU regions. */
+    #define portPRIVILEGED_FLASH_REGION                   ( 0UL )
+    #define portUNPRIVILEGED_FLASH_REGION                 ( 1UL )
+    #define portUNPRIVILEGED_SYSCALLS_REGION              ( 2UL )
+    #define portPRIVILEGED_RAM_REGION                     ( 3UL )
+    #define portSTACK_REGION                              ( 4UL )
+    #define portFIRST_CONFIGURABLE_REGION                 ( 5UL )
+    #define portLAST_CONFIGURABLE_REGION                  ( 7UL )
+    #define portNUM_CONFIGURABLE_REGIONS                  ( ( portLAST_CONFIGURABLE_REGION - portFIRST_CONFIGURABLE_REGION ) + 1 )
+    #define portTOTAL_NUM_REGIONS                         ( portNUM_CONFIGURABLE_REGIONS + 1 )   /* Plus one to make space for the stack region. */
+
+/* Device memory attributes used in MPU_MAIR registers.
+ *
+ * 8-bit values encoded as follows:
+ *  Bit[7:4] - 0000 - Device Memory
+ *  Bit[3:2] - 00 --> Device-nGnRnE
+ *				01 --> Device-nGnRE
+ *				10 --> Device-nGRE
+ *				11 --> Device-GRE
+ *  Bit[1:0] - 00, Reserved.
+ */
+    #define portMPU_DEVICE_MEMORY_nGnRnE                  ( 0x00 )   /* 0000 0000 */
+    #define portMPU_DEVICE_MEMORY_nGnRE                   ( 0x04 )   /* 0000 0100 */
+    #define portMPU_DEVICE_MEMORY_nGRE                    ( 0x08 )   /* 0000 1000 */
+    #define portMPU_DEVICE_MEMORY_GRE                     ( 0x0C )   /* 0000 1100 */
+
+/* Normal memory attributes used in MPU_MAIR registers. */
+    #define portMPU_NORMAL_MEMORY_NON_CACHEABLE           ( 0x44 )   /* Non-cacheable. */
+    #define portMPU_NORMAL_MEMORY_BUFFERABLE_CACHEABLE    ( 0xFF )   /* Non-Transient, Write-back, Read-Allocate and Write-Allocate. */
+
+/* Attributes used in MPU_RBAR registers. */
+    #define portMPU_REGION_NON_SHAREABLE                  ( 0UL << 3UL )
+    #define portMPU_REGION_INNER_SHAREABLE                ( 1UL << 3UL )
+    #define portMPU_REGION_OUTER_SHAREABLE                ( 2UL << 3UL )
+
+    #define portMPU_REGION_PRIVILEGED_READ_WRITE          ( 0UL << 1UL )
+    #define portMPU_REGION_READ_WRITE                     ( 1UL << 1UL )
+    #define portMPU_REGION_PRIVILEGED_READ_ONLY           ( 2UL << 1UL )
+    #define portMPU_REGION_READ_ONLY                      ( 3UL << 1UL )
+
+    #define portMPU_REGION_EXECUTE_NEVER                  ( 1UL )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Settings to define an MPU region.
+ */
+    typedef struct MPURegionSettings
+    {
+        uint32_t ulRBAR; /**< RBAR for the region. */
+        uint32_t ulRLAR; /**< RLAR for the region. */
+    } MPURegionSettings_t;
+
+/**
+ * @brief MPU settings as stored in the TCB.
+ */
+    typedef struct MPU_SETTINGS
+    {
+        uint32_t ulMAIR0;                                              /**< MAIR0 for the task containing attributes for all the 4 per task regions. */
+        MPURegionSettings_t xRegionsSettings[ portTOTAL_NUM_REGIONS ]; /**< Settings for 4 per task regions. */
+    } xMPU_SETTINGS;
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief SVC numbers.
+ */
+    #define portSVC_ALLOCATE_SECURE_CONTEXT    0
+    #define portSVC_FREE_SECURE_CONTEXT        1
+    #define portSVC_START_SCHEDULER            2
+    #define portSVC_RAISE_PRIVILEGE            3
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Scheduler utilities.
+ */
+    #define portYIELD()                                 vPortYield()
+    #define portNVIC_INT_CTRL_REG     ( *( ( volatile uint32_t * ) 0xe000ed04 ) )
+    #define portNVIC_PENDSVSET_BIT    ( 1UL << 28UL )
+    #define portEND_SWITCHING_ISR( xSwitchRequired )    do { if( xSwitchRequired ) portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT; } while( 0 )
+    #define portYIELD_FROM_ISR( x )                     portEND_SWITCHING_ISR( x )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Critical section management.
+ */
+    #define portSET_INTERRUPT_MASK_FROM_ISR()         ulSetInterruptMask()
+    #define portCLEAR_INTERRUPT_MASK_FROM_ISR( x )    vClearInterruptMask( x )
+    #define portDISABLE_INTERRUPTS()                  __asm volatile ( " cpsid i " ::: "memory" )
+    #define portENABLE_INTERRUPTS()                   __asm volatile ( " cpsie i " ::: "memory" )
+    #define portENTER_CRITICAL()                      vPortEnterCritical()
+    #define portEXIT_CRITICAL()                       vPortExitCritical()
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Tickless idle/low power functionality.
+ */
+    #ifndef portSUPPRESS_TICKS_AND_SLEEP
+        extern void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime );
+        #define portSUPPRESS_TICKS_AND_SLEEP( xExpectedIdleTime )    vPortSuppressTicksAndSleep( xExpectedIdleTime )
+    #endif
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Task function macros as described on the FreeRTOS.org WEB site.
+ */
+    #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
+    #define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )
+/*-----------------------------------------------------------*/
+
+    #if ( configENABLE_TRUSTZONE == 1 )
+
+/**
+ * @brief Allocate a secure context for the task.
+ *
+ * Tasks are not created with a secure context. Any task that is going to call
+ * secure functions must call portALLOCATE_SECURE_CONTEXT() to allocate itself a
+ * secure context before it calls any secure function.
+ *
+ * @param[in] ulSecureStackSize The size of the secure stack to be allocated.
+ */
+        #define portALLOCATE_SECURE_CONTEXT( ulSecureStackSize )    vPortAllocateSecureContext( ulSecureStackSize )
+
+/**
+ * @brief Called when a task is deleted to delete the task's secure context,
+ * if it has one.
+ *
+ * @param[in] pxTCB The TCB of the task being deleted.
+ */
+        #define portCLEAN_UP_TCB( pxTCB )                           vPortFreeSecureContext( ( uint32_t * ) pxTCB )
+    #endif /* configENABLE_TRUSTZONE */
+/*-----------------------------------------------------------*/
+
+    #if ( configENABLE_MPU == 1 )
+
+/**
+ * @brief Checks whether or not the processor is privileged.
+ *
+ * @return 1 if the processor is already privileged, 0 otherwise.
+ */
+        #define portIS_PRIVILEGED()      xIsPrivileged()
+
+/**
+ * @brief Raise an SVC request to raise privilege.
+ *
+ * The SVC handler checks that the SVC was raised from a system call and only
+ * then it raises the privilege. If this is called from any other place,
+ * the privilege is not raised.
+ */
+        #define portRAISE_PRIVILEGE()    __asm volatile ( "svc %0 \n" ::"i" ( portSVC_RAISE_PRIVILEGE ) : "memory" );
+
+/**
+ * @brief Lowers the privilege level by setting the bit 0 of the CONTROL
+ * register.
+ */
+        #define portRESET_PRIVILEGE()    vResetPrivilege()
+    #else
+        #define portIS_PRIVILEGED()
+        #define portRAISE_PRIVILEGE()
+        #define portRESET_PRIVILEGE()
+    #endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Barriers.
+ */
+    #define portMEMORY_BARRIER()    __asm volatile ( "" ::: "memory" )
+/*-----------------------------------------------------------*/
+
+    #ifdef __cplusplus
+        }
+    #endif
+
+#endif /* PORTMACRO_H */

freertos/Source/portable/ARMv8M/non_secure/portable/GCC/ARM_CM33/portasm.c

@@ -0,0 +1,422 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+/* Standard includes. */
+#include <stdint.h>
+
+/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE ensures that PRIVILEGED_FUNCTION
+ * is defined correctly and privileged functions are placed in correct sections. */
+#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+/* Portasm includes. */
+#include "portasm.h"
+
+/* MPU_WRAPPERS_INCLUDED_FROM_API_FILE is needed to be defined only for the
+ * header files. */
+#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+void vRestoreContextOfFirstTask( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	.syntax unified									\n"
+        "													\n"
+        "	ldr  r2, pxCurrentTCBConst2						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr  r3, [r2]									\n"/* Read pxCurrentTCB. */
+        "	ldr  r0, [r3]									\n"/* Read top of stack from TCB - The first item in pxCurrentTCB is the task top of stack. */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	dmb											\n"/* Complete outstanding transfers before disabling MPU. */
+            "	ldr r2, xMPUCTRLConst2						\n"/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r4, [r2]								\n"/* Read the value of MPU_CTRL. */
+            "	bic r4, #1									\n"/* r4 = r4 & ~1 i.e. Clear the bit 0 in r4. */
+            "	str r4, [r2]								\n"/* Disable MPU. */
+            "												\n"
+            "	adds r3, #4									\n"/* r3 = r3 + 4. r3 now points to MAIR0 in TCB. */
+            "	ldr  r4, [r3]								\n"/* r4 = *r3 i.e. r4 = MAIR0. */
+            "	ldr  r2, xMAIR0Const2						\n"/* r2 = 0xe000edc0 [Location of MAIR0]. */
+            "	str  r4, [r2]								\n"/* Program MAIR0. */
+            "	ldr  r2, xRNRConst2							\n"/* r2 = 0xe000ed98 [Location of RNR]. */
+            "	movs r4, #4									\n"/* r4 = 4. */
+            "	str  r4, [r2]								\n"/* Program RNR = 4. */
+            "	adds r3, #4									\n"/* r3 = r3 + 4. r3 now points to first RBAR in TCB. */
+            "	ldr  r2, xRBARConst2						\n"/* r2 = 0xe000ed9c [Location of RBAR]. */
+            "	ldmia r3!, {r4-r11}							\n"/* Read 4 set of RBAR/RLAR registers from TCB. */
+            "	stmia r2!, {r4-r11}							\n"/* Write 4 set of RBAR/RLAR registers using alias registers. */
+            "												\n"
+            "	ldr r2, xMPUCTRLConst2						\n"/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r4, [r2]								\n"/* Read the value of MPU_CTRL. */
+            "	orr r4, #1									\n"/* r4 = r4 | 1 i.e. Set the bit 0 in r4. */
+            "	str r4, [r2]								\n"/* Enable MPU. */
+            "	dsb											\n"/* Force memory writes before continuing. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	ldm  r0!, {r1-r4}							\n"/* Read from stack - r1 = xSecureContext, r2 = PSPLIM, r3 = CONTROL and r4 = EXC_RETURN. */
+            "	ldr  r5, xSecureContextConst2				\n"
+            "	str  r1, [r5]								\n"/* Set xSecureContext to this task's value for the same. */
+            "	msr  psplim, r2								\n"/* Set this task's PSPLIM value. */
+            "	msr  control, r3							\n"/* Set this task's CONTROL value. */
+            "	adds r0, #32								\n"/* Discard everything up to r0. */
+            "	msr  psp, r0								\n"/* This is now the new top of stack to use in the task. */
+            "	isb											\n"
+            "	mov  r0, #0									\n"
+            "	msr  basepri, r0							\n"/* Ensure that interrupts are enabled when the first task starts. */
+            "	bx   r4										\n"/* Finally, branch to EXC_RETURN. */
+        #else /* configENABLE_MPU */
+            "	ldm  r0!, {r1-r3}							\n"/* Read from stack - r1 = xSecureContext, r2 = PSPLIM and r3 = EXC_RETURN. */
+            "	ldr  r4, xSecureContextConst2				\n"
+            "	str  r1, [r4]								\n"/* Set xSecureContext to this task's value for the same. */
+            "	msr  psplim, r2								\n"/* Set this task's PSPLIM value. */
+            "	movs r1, #2									\n"/* r1 = 2. */
+            "	msr  CONTROL, r1							\n"/* Switch to use PSP in the thread mode. */
+            "	adds r0, #32								\n"/* Discard everything up to r0. */
+            "	msr  psp, r0								\n"/* This is now the new top of stack to use in the task. */
+            "	isb											\n"
+            "	mov  r0, #0									\n"
+            "	msr  basepri, r0							\n"/* Ensure that interrupts are enabled when the first task starts. */
+            "	bx   r3										\n"/* Finally, branch to EXC_RETURN. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        "	.align 4										\n"
+        "pxCurrentTCBConst2: .word pxCurrentTCB				\n"
+        "xSecureContextConst2: .word xSecureContext			\n"
+        #if ( configENABLE_MPU == 1 )
+            "xMPUCTRLConst2: .word 0xe000ed94				\n"
+            "xMAIR0Const2: .word 0xe000edc0					\n"
+            "xRNRConst2: .word 0xe000ed98					\n"
+            "xRBARConst2: .word 0xe000ed9c					\n"
+        #endif /* configENABLE_MPU */
+    );
+}
+/*-----------------------------------------------------------*/
+
+BaseType_t xIsPrivileged( void ) /* __attribute__ (( naked )) */
+{
+    __asm volatile
+    (
+        "	mrs r0, control									\n"/* r0 = CONTROL. */
+        "	tst r0, #1										\n"/* Perform r0 & 1 (bitwise AND) and update the conditions flag. */
+        "	ite ne											\n"
+        "	movne r0, #0									\n"/* CONTROL[0]!=0. Return false to indicate that the processor is not privileged. */
+        "	moveq r0, #1									\n"/* CONTROL[0]==0. Return true to indicate that the processor is privileged. */
+        "	bx lr											\n"/* Return. */
+        "													\n"
+        "	.align 4										\n"
+        ::: "r0", "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vRaisePrivilege( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	mrs r0, control									\n"/* Read the CONTROL register. */
+        "	bic r0, #1										\n"/* Clear the bit 0. */
+        "	msr control, r0									\n"/* Write back the new CONTROL value. */
+        "	bx lr											\n"/* Return to the caller. */
+        ::: "r0", "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vResetPrivilege( void ) /* __attribute__ (( naked )) */
+{
+    __asm volatile
+    (
+        "	mrs r0, control									\n"/* r0 = CONTROL. */
+        "	orr r0, #1										\n"/* r0 = r0 | 1. */
+        "	msr control, r0									\n"/* CONTROL = r0. */
+        "	bx lr											\n"/* Return to the caller. */
+        ::: "r0", "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vStartFirstTask( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	ldr r0, xVTORConst								\n"/* Use the NVIC offset register to locate the stack. */
+        "	ldr r0, [r0]									\n"/* Read the VTOR register which gives the address of vector table. */
+        "	ldr r0, [r0]									\n"/* The first entry in vector table is stack pointer. */
+        "	msr msp, r0										\n"/* Set the MSP back to the start of the stack. */
+        "	cpsie i											\n"/* Globally enable interrupts. */
+        "	cpsie f											\n"
+        "	dsb												\n"
+        "	isb												\n"
+        "	svc %0											\n"/* System call to start the first task. */
+        "	nop												\n"
+        "													\n"
+        "   .align 4										\n"
+        "xVTORConst: .word 0xe000ed08						\n"
+        ::"i" ( portSVC_START_SCHEDULER ) : "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+uint32_t ulSetInterruptMask( void ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	mrs r0, basepri									\n"/* r0 = basepri. Return original basepri value. */
+        "	mov r1, %0										\n"/* r1 = configMAX_SYSCALL_INTERRUPT_PRIORITY. */
+        "	msr basepri, r1									\n"/* Disable interrupts upto configMAX_SYSCALL_INTERRUPT_PRIORITY. */
+        "	dsb												\n"
+        "	isb												\n"
+        "	bx lr											\n"/* Return. */
+        ::"i" ( configMAX_SYSCALL_INTERRUPT_PRIORITY ) : "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vClearInterruptMask( __attribute__( ( unused ) ) uint32_t ulMask ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	msr basepri, r0									\n"/* basepri = ulMask. */
+        "	dsb												\n"
+        "	isb												\n"
+        "	bx lr											\n"/* Return. */
+        ::: "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void PendSV_Handler( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	.syntax unified									\n"
+        "	.extern SecureContext_SaveContext				\n"
+        "	.extern SecureContext_LoadContext				\n"
+        "													\n"
+        "	ldr r3, xSecureContextConst						\n"/* Read the location of xSecureContext i.e. &( xSecureContext ). */
+        "	ldr r0, [r3]									\n"/* Read xSecureContext - Value of xSecureContext must be in r0 as it is used as a parameter later. */
+        "	ldr r3, pxCurrentTCBConst						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr r1, [r3]									\n"/* Read pxCurrentTCB - Value of pxCurrentTCB must be in r1 as it is used as a parameter later. */
+        "	mrs r2, psp										\n"/* Read PSP in r2. */
+        "													\n"
+        "	cbz r0, save_ns_context							\n"/* No secure context to save. */
+        "	push {r0-r2, r14}								\n"
+        "	bl SecureContext_SaveContext					\n"/* Params are in r0 and r1. r0 = xSecureContext and r1 = pxCurrentTCB. */
+        "	pop {r0-r3}										\n"/* LR is now in r3. */
+        "	mov lr, r3										\n"/* LR = r3. */
+        "	lsls r1, r3, #25								\n"/* r1 = r3 << 25. Bit[6] of EXC_RETURN is 1 if secure stack was used, 0 if non-secure stack was used to store stack frame. */
+        "	bpl save_ns_context								\n"/* bpl - branch if positive or zero. If r1 >= 0 ==> Bit[6] in EXC_RETURN is 0 i.e. non-secure stack was used. */
+        "													\n"
+        "	ldr r3, pxCurrentTCBConst						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr r1, [r3]									\n"/* Read pxCurrentTCB.*/
+        #if ( configENABLE_MPU == 1 )
+            "	subs r2, r2, #16							\n"/* Make space for xSecureContext, PSPLIM, CONTROL and LR on the stack. */
+            "	str r2, [r1]								\n"/* Save the new top of stack in TCB. */
+            "	mrs r1, psplim								\n"/* r1 = PSPLIM. */
+            "	mrs r3, control								\n"/* r3 = CONTROL. */
+            "	mov r4, lr									\n"/* r4 = LR/EXC_RETURN. */
+            "	stmia r2!, {r0, r1, r3, r4}					\n"/* Store xSecureContext, PSPLIM, CONTROL and LR on the stack. */
+        #else /* configENABLE_MPU */
+            "	subs r2, r2, #12							\n"/* Make space for xSecureContext, PSPLIM and LR on the stack. */
+            "	str r2, [r1]								\n"/* Save the new top of stack in TCB. */
+            "	mrs r1, psplim								\n"/* r1 = PSPLIM. */
+            "	mov r3, lr									\n"/* r3 = LR/EXC_RETURN. */
+            "	stmia r2!, {r0, r1, r3}						\n"/* Store xSecureContext, PSPLIM and LR on the stack. */
+        #endif /* configENABLE_MPU */
+        "	b select_next_task								\n"
+        "													\n"
+        " save_ns_context:									\n"
+        "	ldr r3, pxCurrentTCBConst						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr r1, [r3]									\n"/* Read pxCurrentTCB. */
+        #if ( configENABLE_FPU == 1 )
+            "	tst lr, #0x10								\n"/* Test Bit[4] in LR. Bit[4] of EXC_RETURN is 0 if the FPU is in use. */
+            "	it eq										\n"
+            "	vstmdbeq r2!, {s16-s31}						\n"/* Store the FPU registers which are not saved automatically. */
+        #endif /* configENABLE_FPU */
+        #if ( configENABLE_MPU == 1 )
+            "	subs r2, r2, #48							\n"/* Make space for xSecureContext, PSPLIM, CONTROL, LR and the remaining registers on the stack. */
+            "	str r2, [r1]								\n"/* Save the new top of stack in TCB. */
+            "	adds r2, r2, #16							\n"/* r2 = r2 + 16. */
+            "	stm r2, {r4-r11}							\n"/* Store the registers that are not saved automatically. */
+            "	mrs r1, psplim								\n"/* r1 = PSPLIM. */
+            "	mrs r3, control								\n"/* r3 = CONTROL. */
+            "	mov r4, lr									\n"/* r4 = LR/EXC_RETURN. */
+            "	subs r2, r2, #16							\n"/* r2 = r2 - 16. */
+            "	stmia r2!, {r0, r1, r3, r4}					\n"/* Store xSecureContext, PSPLIM, CONTROL and LR on the stack. */
+        #else /* configENABLE_MPU */
+            "	subs r2, r2, #44							\n"/* Make space for xSecureContext, PSPLIM, LR and the remaining registers on the stack. */
+            "	str r2, [r1]								\n"/* Save the new top of stack in TCB. */
+            "	adds r2, r2, #12							\n"/* r2 = r2 + 12. */
+            "	stm r2, {r4-r11}							\n"/* Store the registers that are not saved automatically. */
+            "	mrs r1, psplim								\n"/* r1 = PSPLIM. */
+            "	mov r3, lr									\n"/* r3 = LR/EXC_RETURN. */
+            "	subs r2, r2, #12							\n"/* r2 = r2 - 12. */
+            "	stmia r2!, {r0, r1, r3}						\n"/* Store xSecureContext, PSPLIM and LR on the stack. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        " select_next_task:									\n"
+        "	mov r0, %0										\n"/* r0 = configMAX_SYSCALL_INTERRUPT_PRIORITY */
+        "	msr basepri, r0									\n"/* Disable interrupts upto configMAX_SYSCALL_INTERRUPT_PRIORITY. */
+        "	dsb												\n"
+        "	isb												\n"
+        "	bl vTaskSwitchContext							\n"
+        "	mov r0, #0										\n"/* r0 = 0. */
+        "	msr basepri, r0									\n"/* Enable interrupts. */
+        "													\n"
+        "	ldr r3, pxCurrentTCBConst						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr r1, [r3]									\n"/* Read pxCurrentTCB. */
+        "	ldr r2, [r1]									\n"/* The first item in pxCurrentTCB is the task top of stack. r2 now points to the top of stack. */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	dmb											\n"/* Complete outstanding transfers before disabling MPU. */
+            "	ldr r3, xMPUCTRLConst						\n"/* r3 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r4, [r3]								\n"/* Read the value of MPU_CTRL. */
+            "	bic r4, #1									\n"/* r4 = r4 & ~1 i.e. Clear the bit 0 in r4. */
+            "	str r4, [r3]								\n"/* Disable MPU. */
+            "												\n"
+            "	adds r1, #4									\n"/* r1 = r1 + 4. r1 now points to MAIR0 in TCB. */
+            "	ldr r4, [r1]								\n"/* r4 = *r1 i.e. r4 = MAIR0. */
+            "	ldr r3, xMAIR0Const							\n"/* r3 = 0xe000edc0 [Location of MAIR0]. */
+            "	str r4, [r3]								\n"/* Program MAIR0. */
+            "	ldr r3, xRNRConst							\n"/* r3 = 0xe000ed98 [Location of RNR]. */
+            "	movs r4, #4									\n"/* r4 = 4. */
+            "	str r4, [r3]								\n"/* Program RNR = 4. */
+            "	adds r1, #4									\n"/* r1 = r1 + 4. r1 now points to first RBAR in TCB. */
+            "	ldr r3, xRBARConst							\n"/* r3 = 0xe000ed9c [Location of RBAR]. */
+            "	ldmia r1!, {r4-r11}							\n"/* Read 4 sets of RBAR/RLAR registers from TCB. */
+            "	stmia r3!, {r4-r11}							\n"/* Write 4 set of RBAR/RLAR registers using alias registers. */
+            "												\n"
+            "	ldr r3, xMPUCTRLConst						\n"/* r3 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r4, [r3]								\n"/* Read the value of MPU_CTRL. */
+            "	orr r4, #1									\n"/* r4 = r4 | 1 i.e. Set the bit 0 in r4. */
+            "	str r4, [r3]								\n"/* Enable MPU. */
+            "	dsb											\n"/* Force memory writes before continuing. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	ldmia r2!, {r0, r1, r3, r4}					\n"/* Read from stack - r0 = xSecureContext, r1 = PSPLIM, r3 = CONTROL and r4 = LR. */
+            "	msr psplim, r1								\n"/* Restore the PSPLIM register value for the task. */
+            "	msr control, r3								\n"/* Restore the CONTROL register value for the task. */
+            "	mov lr, r4									\n"/* LR = r4. */
+            "	ldr r3, xSecureContextConst					\n"/* Read the location of xSecureContext i.e. &( xSecureContext ). */
+            "	str r0, [r3]								\n"/* Restore the task's xSecureContext. */
+            "	cbz r0, restore_ns_context					\n"/* If there is no secure context for the task, restore the non-secure context. */
+            "	ldr r3, pxCurrentTCBConst					\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+            "	ldr r1, [r3]								\n"/* Read pxCurrentTCB. */
+            "	push {r2, r4}								\n"
+            "	bl SecureContext_LoadContext				\n"/* Restore the secure context. Params are in r0 and r1. r0 = xSecureContext and r1 = pxCurrentTCB. */
+            "	pop {r2, r4}								\n"
+            "	mov lr, r4									\n"/* LR = r4. */
+            "	lsls r1, r4, #25							\n"/* r1 = r4 << 25. Bit[6] of EXC_RETURN is 1 if secure stack was used, 0 if non-secure stack was used to store stack frame. */
+            "	bpl restore_ns_context						\n"/* bpl - branch if positive or zero. If r1 >= 0 ==> Bit[6] in EXC_RETURN is 0 i.e. non-secure stack was used. */
+            "	msr psp, r2									\n"/* Remember the new top of stack for the task. */
+            "	bx lr										\n"
+        #else /* configENABLE_MPU */
+            "	ldmia r2!, {r0, r1, r4}						\n"/* Read from stack - r0 = xSecureContext, r1 = PSPLIM and r4 = LR. */
+            "	msr psplim, r1								\n"/* Restore the PSPLIM register value for the task. */
+            "	mov lr, r4									\n"/* LR = r4. */
+            "	ldr r3, xSecureContextConst					\n"/* Read the location of xSecureContext i.e. &( xSecureContext ). */
+            "	str r0, [r3]								\n"/* Restore the task's xSecureContext. */
+            "	cbz r0, restore_ns_context					\n"/* If there is no secure context for the task, restore the non-secure context. */
+            "	ldr r3, pxCurrentTCBConst					\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+            "	ldr r1, [r3]								\n"/* Read pxCurrentTCB. */
+            "	push {r2, r4}								\n"
+            "	bl SecureContext_LoadContext				\n"/* Restore the secure context. Params are in r0 and r1. r0 = xSecureContext and r1 = pxCurrentTCB. */
+            "	pop {r2, r4}								\n"
+            "	mov lr, r4									\n"/* LR = r4. */
+            "	lsls r1, r4, #25							\n"/* r1 = r4 << 25. Bit[6] of EXC_RETURN is 1 if secure stack was used, 0 if non-secure stack was used to store stack frame. */
+            "	bpl restore_ns_context						\n"/* bpl - branch if positive or zero. If r1 >= 0 ==> Bit[6] in EXC_RETURN is 0 i.e. non-secure stack was used. */
+            "	msr psp, r2									\n"/* Remember the new top of stack for the task. */
+            "	bx lr										\n"
+        #endif /* configENABLE_MPU */
+        "													\n"
+        " restore_ns_context:								\n"
+        "	ldmia r2!, {r4-r11}								\n"/* Restore the registers that are not automatically restored. */
+        #if ( configENABLE_FPU == 1 )
+            "	tst lr, #0x10								\n"/* Test Bit[4] in LR. Bit[4] of EXC_RETURN is 0 if the FPU is in use. */
+            "	it eq										\n"
+            "	vldmiaeq r2!, {s16-s31}						\n"/* Restore the FPU registers which are not restored automatically. */
+        #endif /* configENABLE_FPU */
+        "	msr psp, r2										\n"/* Remember the new top of stack for the task. */
+        "	bx lr											\n"
+        "													\n"
+        "	.align 4										\n"
+        "pxCurrentTCBConst: .word pxCurrentTCB				\n"
+        "xSecureContextConst: .word xSecureContext			\n"
+        #if ( configENABLE_MPU == 1 )
+            "xMPUCTRLConst: .word 0xe000ed94				\n"
+            "xMAIR0Const: .word 0xe000edc0					\n"
+            "xRNRConst: .word 0xe000ed98					\n"
+            "xRBARConst: .word 0xe000ed9c					\n"
+        #endif /* configENABLE_MPU */
+        ::"i" ( configMAX_SYSCALL_INTERRUPT_PRIORITY )
+    );
+}
+/*-----------------------------------------------------------*/
+
+void SVC_Handler( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	tst lr, #4										\n"
+        "	ite eq											\n"
+        "	mrseq r0, msp									\n"
+        "	mrsne r0, psp									\n"
+        "	ldr r1, svchandler_address_const				\n"
+        "	bx r1											\n"
+        "													\n"
+        "	.align 4										\n"
+        "svchandler_address_const: .word vPortSVCHandler_C	\n"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vPortAllocateSecureContext( uint32_t ulSecureStackSize ) /* __attribute__ (( naked )) */
+{
+    __asm volatile
+    (
+        "	svc %0											\n"/* Secure context is allocated in the supervisor call. */
+        "	bx lr											\n"/* Return. */
+        ::"i" ( portSVC_ALLOCATE_SECURE_CONTEXT ) : "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vPortFreeSecureContext( uint32_t * pulTCB ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	ldr r2, [r0]									\n"/* The first item in the TCB is the top of the stack. */
+        "	ldr r1, [r2]									\n"/* The first item on the stack is the task's xSecureContext. */
+        "	cmp r1, #0										\n"/* Raise svc if task's xSecureContext is not NULL. */
+        "	it ne											\n"
+        "	svcne %0										\n"/* Secure context is freed in the supervisor call. */
+        "	bx lr											\n"/* Return. */
+        ::"i" ( portSVC_FREE_SECURE_CONTEXT ) : "memory"
+    );
+}
+/*-----------------------------------------------------------*/

freertos/Source/portable/ARMv8M/non_secure/portable/GCC/ARM_CM33/portmacro.h

@@ -0,0 +1,310 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef PORTMACRO_H
+    #define PORTMACRO_H
+
+    #ifdef __cplusplus
+        extern "C" {
+    #endif
+
+/*------------------------------------------------------------------------------
+ * Port specific definitions.
+ *
+ * The settings in this file configure FreeRTOS correctly for the given hardware
+ * and compiler.
+ *
+ * These settings should not be altered.
+ *------------------------------------------------------------------------------
+ */
+
+    #ifndef configENABLE_FPU
+        #error configENABLE_FPU must be defined in FreeRTOSConfig.h.  Set configENABLE_FPU to 1 to enable the FPU or 0 to disable the FPU.
+    #endif /* configENABLE_FPU */
+
+    #ifndef configENABLE_MPU
+        #error configENABLE_MPU must be defined in FreeRTOSConfig.h.  Set configENABLE_MPU to 1 to enable the MPU or 0 to disable the MPU.
+    #endif /* configENABLE_MPU */
+
+    #ifndef configENABLE_TRUSTZONE
+        #error configENABLE_TRUSTZONE must be defined in FreeRTOSConfig.h.  Set configENABLE_TRUSTZONE to 1 to enable TrustZone or 0 to disable TrustZone.
+    #endif /* configENABLE_TRUSTZONE */
+
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Type definitions.
+ */
+    #define portCHAR          char
+    #define portFLOAT         float
+    #define portDOUBLE        double
+    #define portLONG          long
+    #define portSHORT         short
+    #define portSTACK_TYPE    uint32_t
+    #define portBASE_TYPE     long
+
+    typedef portSTACK_TYPE   StackType_t;
+    typedef long             BaseType_t;
+    typedef unsigned long    UBaseType_t;
+
+    #if ( configUSE_16_BIT_TICKS == 1 )
+        typedef uint16_t     TickType_t;
+        #define portMAX_DELAY              ( TickType_t ) 0xffff
+    #else
+        typedef uint32_t     TickType_t;
+        #define portMAX_DELAY              ( TickType_t ) 0xffffffffUL
+
+/* 32-bit tick type on a 32-bit architecture, so reads of the tick count do
+ * not need to be guarded with a critical section. */
+        #define portTICK_TYPE_IS_ATOMIC    1
+    #endif
+/*-----------------------------------------------------------*/
+
+/**
+ * Architecture specifics.
+ */
+    #define portARCH_NAME                      "Cortex-M33"
+    #define portSTACK_GROWTH                   ( -1 )
+    #define portTICK_PERIOD_MS                 ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
+    #define portBYTE_ALIGNMENT                 8
+    #define portNOP()
+    #define portINLINE                         __inline
+    #ifndef portFORCE_INLINE
+        #define portFORCE_INLINE               inline __attribute__( ( always_inline ) )
+    #endif
+    #define portHAS_STACK_OVERFLOW_CHECKING    1
+    #define portDONT_DISCARD                   __attribute__( ( used ) )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Extern declarations.
+ */
+    extern BaseType_t xPortIsInsideInterrupt( void );
+
+    extern void vPortYield( void ) /* PRIVILEGED_FUNCTION */;
+
+    extern void vPortEnterCritical( void ) /* PRIVILEGED_FUNCTION */;
+    extern void vPortExitCritical( void ) /* PRIVILEGED_FUNCTION */;
+
+    extern uint32_t ulSetInterruptMask( void ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */;
+    extern void vClearInterruptMask( uint32_t ulMask ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */;
+
+    #if ( configENABLE_TRUSTZONE == 1 )
+        extern void vPortAllocateSecureContext( uint32_t ulSecureStackSize ); /* __attribute__ (( naked )) */
+        extern void vPortFreeSecureContext( uint32_t * pulTCB ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */;
+    #endif /* configENABLE_TRUSTZONE */
+
+    #if ( configENABLE_MPU == 1 )
+        extern BaseType_t xIsPrivileged( void ) /* __attribute__ (( naked )) */;
+        extern void vResetPrivilege( void ) /* __attribute__ (( naked )) */;
+    #endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief MPU specific constants.
+ */
+    #if ( configENABLE_MPU == 1 )
+        #define portUSING_MPU_WRAPPERS    1
+        #define portPRIVILEGE_BIT         ( 0x80000000UL )
+    #else
+        #define portPRIVILEGE_BIT         ( 0x0UL )
+    #endif /* configENABLE_MPU */
+
+
+/* MPU regions. */
+    #define portPRIVILEGED_FLASH_REGION                   ( 0UL )
+    #define portUNPRIVILEGED_FLASH_REGION                 ( 1UL )
+    #define portUNPRIVILEGED_SYSCALLS_REGION              ( 2UL )
+    #define portPRIVILEGED_RAM_REGION                     ( 3UL )
+    #define portSTACK_REGION                              ( 4UL )
+    #define portFIRST_CONFIGURABLE_REGION                 ( 5UL )
+    #define portLAST_CONFIGURABLE_REGION                  ( 7UL )
+    #define portNUM_CONFIGURABLE_REGIONS                  ( ( portLAST_CONFIGURABLE_REGION - portFIRST_CONFIGURABLE_REGION ) + 1 )
+    #define portTOTAL_NUM_REGIONS                         ( portNUM_CONFIGURABLE_REGIONS + 1 )   /* Plus one to make space for the stack region. */
+
+/* Device memory attributes used in MPU_MAIR registers.
+ *
+ * 8-bit values encoded as follows:
+ *  Bit[7:4] - 0000 - Device Memory
+ *  Bit[3:2] - 00 --> Device-nGnRnE
+ *				01 --> Device-nGnRE
+ *				10 --> Device-nGRE
+ *				11 --> Device-GRE
+ *  Bit[1:0] - 00, Reserved.
+ */
+    #define portMPU_DEVICE_MEMORY_nGnRnE                  ( 0x00 )   /* 0000 0000 */
+    #define portMPU_DEVICE_MEMORY_nGnRE                   ( 0x04 )   /* 0000 0100 */
+    #define portMPU_DEVICE_MEMORY_nGRE                    ( 0x08 )   /* 0000 1000 */
+    #define portMPU_DEVICE_MEMORY_GRE                     ( 0x0C )   /* 0000 1100 */
+
+/* Normal memory attributes used in MPU_MAIR registers. */
+    #define portMPU_NORMAL_MEMORY_NON_CACHEABLE           ( 0x44 )   /* Non-cacheable. */
+    #define portMPU_NORMAL_MEMORY_BUFFERABLE_CACHEABLE    ( 0xFF )   /* Non-Transient, Write-back, Read-Allocate and Write-Allocate. */
+
+/* Attributes used in MPU_RBAR registers. */
+    #define portMPU_REGION_NON_SHAREABLE                  ( 0UL << 3UL )
+    #define portMPU_REGION_INNER_SHAREABLE                ( 1UL << 3UL )
+    #define portMPU_REGION_OUTER_SHAREABLE                ( 2UL << 3UL )
+
+    #define portMPU_REGION_PRIVILEGED_READ_WRITE          ( 0UL << 1UL )
+    #define portMPU_REGION_READ_WRITE                     ( 1UL << 1UL )
+    #define portMPU_REGION_PRIVILEGED_READ_ONLY           ( 2UL << 1UL )
+    #define portMPU_REGION_READ_ONLY                      ( 3UL << 1UL )
+
+    #define portMPU_REGION_EXECUTE_NEVER                  ( 1UL )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Settings to define an MPU region.
+ */
+    typedef struct MPURegionSettings
+    {
+        uint32_t ulRBAR; /**< RBAR for the region. */
+        uint32_t ulRLAR; /**< RLAR for the region. */
+    } MPURegionSettings_t;
+
+/**
+ * @brief MPU settings as stored in the TCB.
+ */
+    typedef struct MPU_SETTINGS
+    {
+        uint32_t ulMAIR0;                                              /**< MAIR0 for the task containing attributes for all the 4 per task regions. */
+        MPURegionSettings_t xRegionsSettings[ portTOTAL_NUM_REGIONS ]; /**< Settings for 4 per task regions. */
+    } xMPU_SETTINGS;
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief SVC numbers.
+ */
+    #define portSVC_ALLOCATE_SECURE_CONTEXT    0
+    #define portSVC_FREE_SECURE_CONTEXT        1
+    #define portSVC_START_SCHEDULER            2
+    #define portSVC_RAISE_PRIVILEGE            3
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Scheduler utilities.
+ */
+    #define portYIELD()                                 vPortYield()
+    #define portNVIC_INT_CTRL_REG     ( *( ( volatile uint32_t * ) 0xe000ed04 ) )
+    #define portNVIC_PENDSVSET_BIT    ( 1UL << 28UL )
+    #define portEND_SWITCHING_ISR( xSwitchRequired )    do { if( xSwitchRequired ) portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT; } while( 0 )
+    #define portYIELD_FROM_ISR( x )                     portEND_SWITCHING_ISR( x )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Critical section management.
+ */
+    #define portSET_INTERRUPT_MASK_FROM_ISR()         ulSetInterruptMask()
+    #define portCLEAR_INTERRUPT_MASK_FROM_ISR( x )    vClearInterruptMask( x )
+    #define portDISABLE_INTERRUPTS()                  ulSetInterruptMask()
+    #define portENABLE_INTERRUPTS()                   vClearInterruptMask( 0 )
+    #define portENTER_CRITICAL()                      vPortEnterCritical()
+    #define portEXIT_CRITICAL()                       vPortExitCritical()
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Tickless idle/low power functionality.
+ */
+    #ifndef portSUPPRESS_TICKS_AND_SLEEP
+        extern void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime );
+        #define portSUPPRESS_TICKS_AND_SLEEP( xExpectedIdleTime )    vPortSuppressTicksAndSleep( xExpectedIdleTime )
+    #endif
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Task function macros as described on the FreeRTOS.org WEB site.
+ */
+    #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
+    #define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )
+/*-----------------------------------------------------------*/
+
+    #if ( configENABLE_TRUSTZONE == 1 )
+
+/**
+ * @brief Allocate a secure context for the task.
+ *
+ * Tasks are not created with a secure context. Any task that is going to call
+ * secure functions must call portALLOCATE_SECURE_CONTEXT() to allocate itself a
+ * secure context before it calls any secure function.
+ *
+ * @param[in] ulSecureStackSize The size of the secure stack to be allocated.
+ */
+        #define portALLOCATE_SECURE_CONTEXT( ulSecureStackSize )    vPortAllocateSecureContext( ulSecureStackSize )
+
+/**
+ * @brief Called when a task is deleted to delete the task's secure context,
+ * if it has one.
+ *
+ * @param[in] pxTCB The TCB of the task being deleted.
+ */
+        #define portCLEAN_UP_TCB( pxTCB )                           vPortFreeSecureContext( ( uint32_t * ) pxTCB )
+    #endif /* configENABLE_TRUSTZONE */
+/*-----------------------------------------------------------*/
+
+    #if ( configENABLE_MPU == 1 )
+
+/**
+ * @brief Checks whether or not the processor is privileged.
+ *
+ * @return 1 if the processor is already privileged, 0 otherwise.
+ */
+        #define portIS_PRIVILEGED()      xIsPrivileged()
+
+/**
+ * @brief Raise an SVC request to raise privilege.
+ *
+ * The SVC handler checks that the SVC was raised from a system call and only
+ * then it raises the privilege. If this is called from any other place,
+ * the privilege is not raised.
+ */
+        #define portRAISE_PRIVILEGE()    __asm volatile ( "svc %0 \n" ::"i" ( portSVC_RAISE_PRIVILEGE ) : "memory" );
+
+/**
+ * @brief Lowers the privilege level by setting the bit 0 of the CONTROL
+ * register.
+ */
+        #define portRESET_PRIVILEGE()    vResetPrivilege()
+    #else
+        #define portIS_PRIVILEGED()
+        #define portRAISE_PRIVILEGE()
+        #define portRESET_PRIVILEGE()
+    #endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Barriers.
+ */
+    #define portMEMORY_BARRIER()    __asm volatile ( "" ::: "memory" )
+/*-----------------------------------------------------------*/
+
+    #ifdef __cplusplus
+        }
+    #endif
+
+#endif /* PORTMACRO_H */

freertos/Source/portable/ARMv8M/non_secure/portable/GCC/ARM_CM33_NTZ/portasm.c

@@ -0,0 +1,321 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+/* Standard includes. */
+#include <stdint.h>
+
+/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE ensures that PRIVILEGED_FUNCTION
+ * is defined correctly and privileged functions are placed in correct sections. */
+#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+/* Portasm includes. */
+#include "portasm.h"
+
+/* MPU_WRAPPERS_INCLUDED_FROM_API_FILE is needed to be defined only for the
+ * header files. */
+#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
+
+void vRestoreContextOfFirstTask( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	.syntax unified									\n"
+        "													\n"
+        "	ldr  r2, pxCurrentTCBConst2						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr  r1, [r2]									\n"/* Read pxCurrentTCB. */
+        "	ldr  r0, [r1]									\n"/* Read top of stack from TCB - The first item in pxCurrentTCB is the task top of stack. */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	dmb												\n"/* Complete outstanding transfers before disabling MPU. */
+            "	ldr r2, xMPUCTRLConst2							\n"/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r4, [r2]									\n"/* Read the value of MPU_CTRL. */
+            "	bic r4, #1										\n"/* r4 = r4 & ~1 i.e. Clear the bit 0 in r4. */
+            "	str r4, [r2]									\n"/* Disable MPU. */
+            "													\n"
+            "	adds r1, #4										\n"/* r1 = r1 + 4. r1 now points to MAIR0 in TCB. */
+            "	ldr  r3, [r1]									\n"/* r3 = *r1 i.e. r3 = MAIR0. */
+            "	ldr  r2, xMAIR0Const2							\n"/* r2 = 0xe000edc0 [Location of MAIR0]. */
+            "	str  r3, [r2]									\n"/* Program MAIR0. */
+            "	ldr  r2, xRNRConst2								\n"/* r2 = 0xe000ed98 [Location of RNR]. */
+            "	movs r3, #4										\n"/* r3 = 4. */
+            "	str  r3, [r2]									\n"/* Program RNR = 4. */
+            "	adds r1, #4										\n"/* r1 = r1 + 4. r1 now points to first RBAR in TCB. */
+            "	ldr  r2, xRBARConst2							\n"/* r2 = 0xe000ed9c [Location of RBAR]. */
+            "	ldmia r1!, {r4-r11}								\n"/* Read 4 set of RBAR/RLAR registers from TCB. */
+            "	stmia r2!, {r4-r11}								\n"/* Write 4 set of RBAR/RLAR registers using alias registers. */
+            "													\n"
+            "	ldr r2, xMPUCTRLConst2							\n"/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r4, [r2]									\n"/* Read the value of MPU_CTRL. */
+            "	orr r4, #1										\n"/* r4 = r4 | 1 i.e. Set the bit 0 in r4. */
+            "	str r4, [r2]									\n"/* Enable MPU. */
+            "	dsb												\n"/* Force memory writes before continuing. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	ldm  r0!, {r1-r3}								\n"/* Read from stack - r1 = PSPLIM, r2 = CONTROL and r3 = EXC_RETURN. */
+            "	msr  psplim, r1									\n"/* Set this task's PSPLIM value. */
+            "	msr  control, r2								\n"/* Set this task's CONTROL value. */
+            "	adds r0, #32									\n"/* Discard everything up to r0. */
+            "	msr  psp, r0									\n"/* This is now the new top of stack to use in the task. */
+            "	isb												\n"
+            "	mov  r0, #0										\n"
+            "	msr  basepri, r0								\n"/* Ensure that interrupts are enabled when the first task starts. */
+            "	bx   r3											\n"/* Finally, branch to EXC_RETURN. */
+        #else /* configENABLE_MPU */
+            "	ldm  r0!, {r1-r2}								\n"/* Read from stack - r1 = PSPLIM and r2 = EXC_RETURN. */
+            "	msr  psplim, r1									\n"/* Set this task's PSPLIM value. */
+            "	movs r1, #2										\n"/* r1 = 2. */
+            "	msr  CONTROL, r1								\n"/* Switch to use PSP in the thread mode. */
+            "	adds r0, #32									\n"/* Discard everything up to r0. */
+            "	msr  psp, r0									\n"/* This is now the new top of stack to use in the task. */
+            "	isb												\n"
+            "	mov  r0, #0										\n"
+            "	msr  basepri, r0								\n"/* Ensure that interrupts are enabled when the first task starts. */
+            "	bx   r2											\n"/* Finally, branch to EXC_RETURN. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        "	.align 4										\n"
+        "pxCurrentTCBConst2: .word pxCurrentTCB				\n"
+        #if ( configENABLE_MPU == 1 )
+            "xMPUCTRLConst2: .word 0xe000ed94					\n"
+            "xMAIR0Const2: .word 0xe000edc0						\n"
+            "xRNRConst2: .word 0xe000ed98						\n"
+            "xRBARConst2: .word 0xe000ed9c						\n"
+        #endif /* configENABLE_MPU */
+    );
+}
+/*-----------------------------------------------------------*/
+
+BaseType_t xIsPrivileged( void ) /* __attribute__ (( naked )) */
+{
+    __asm volatile
+    (
+        "	mrs r0, control									\n"/* r0 = CONTROL. */
+        "	tst r0, #1										\n"/* Perform r0 & 1 (bitwise AND) and update the conditions flag. */
+        "	ite ne											\n"
+        "	movne r0, #0									\n"/* CONTROL[0]!=0. Return false to indicate that the processor is not privileged. */
+        "	moveq r0, #1									\n"/* CONTROL[0]==0. Return true to indicate that the processor is privileged. */
+        "	bx lr											\n"/* Return. */
+        "													\n"
+        "	.align 4										\n"
+        ::: "r0", "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vRaisePrivilege( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	mrs  r0, control								\n"/* Read the CONTROL register. */
+        "	bic r0, #1										\n"/* Clear the bit 0. */
+        "	msr  control, r0								\n"/* Write back the new CONTROL value. */
+        "	bx lr											\n"/* Return to the caller. */
+        ::: "r0", "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vResetPrivilege( void ) /* __attribute__ (( naked )) */
+{
+    __asm volatile
+    (
+        "	mrs r0, control									\n"/* r0 = CONTROL. */
+        "	orr r0, #1										\n"/* r0 = r0 | 1. */
+        "	msr control, r0									\n"/* CONTROL = r0. */
+        "	bx lr											\n"/* Return to the caller. */
+        ::: "r0", "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vStartFirstTask( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	ldr r0, xVTORConst								\n"/* Use the NVIC offset register to locate the stack. */
+        "	ldr r0, [r0]									\n"/* Read the VTOR register which gives the address of vector table. */
+        "	ldr r0, [r0]									\n"/* The first entry in vector table is stack pointer. */
+        "	msr msp, r0										\n"/* Set the MSP back to the start of the stack. */
+        "	cpsie i											\n"/* Globally enable interrupts. */
+        "	cpsie f											\n"
+        "	dsb												\n"
+        "	isb												\n"
+        "	svc %0											\n"/* System call to start the first task. */
+        "	nop												\n"
+        "													\n"
+        "   .align 4										\n"
+        "xVTORConst: .word 0xe000ed08						\n"
+        ::"i" ( portSVC_START_SCHEDULER ) : "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+uint32_t ulSetInterruptMask( void ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	mrs r0, basepri									\n"/* r0 = basepri. Return original basepri value. */
+        "	mov r1, %0										\n"/* r1 = configMAX_SYSCALL_INTERRUPT_PRIORITY. */
+        "	msr basepri, r1									\n"/* Disable interrupts upto configMAX_SYSCALL_INTERRUPT_PRIORITY. */
+        "	dsb												\n"
+        "	isb												\n"
+        "	bx lr											\n"/* Return. */
+        ::"i" ( configMAX_SYSCALL_INTERRUPT_PRIORITY ) : "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void vClearInterruptMask( __attribute__( ( unused ) ) uint32_t ulMask ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	msr basepri, r0									\n"/* basepri = ulMask. */
+        "	dsb												\n"
+        "	isb												\n"
+        "	bx lr											\n"/* Return. */
+        ::: "memory"
+    );
+}
+/*-----------------------------------------------------------*/
+
+void PendSV_Handler( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	.syntax unified									\n"
+        "													\n"
+        "	mrs r0, psp										\n"/* Read PSP in r0. */
+        #if ( configENABLE_FPU == 1 )
+            "	tst lr, #0x10									\n"/* Test Bit[4] in LR. Bit[4] of EXC_RETURN is 0 if the FPU is in use. */
+            "	it eq											\n"
+            "	vstmdbeq r0!, {s16-s31}							\n"/* Store the FPU registers which are not saved automatically. */
+        #endif /* configENABLE_FPU */
+        #if ( configENABLE_MPU == 1 )
+            "	mrs r1, psplim									\n"/* r1 = PSPLIM. */
+            "	mrs r2, control									\n"/* r2 = CONTROL. */
+            "	mov r3, lr										\n"/* r3 = LR/EXC_RETURN. */
+            "	stmdb r0!, {r1-r11}								\n"/* Store on the stack - PSPLIM, CONTROL, LR and registers that are not automatically saved. */
+        #else /* configENABLE_MPU */
+            "	mrs r2, psplim									\n"/* r2 = PSPLIM. */
+            "	mov r3, lr										\n"/* r3 = LR/EXC_RETURN. */
+            "	stmdb r0!, {r2-r11}								\n"/* Store on the stack - PSPLIM, LR and registers that are not automatically saved. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        "	ldr r2, pxCurrentTCBConst						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr r1, [r2]									\n"/* Read pxCurrentTCB. */
+        "	str r0, [r1]									\n"/* Save the new top of stack in TCB. */
+        "													\n"
+        "	mov r0, %0										\n"/* r0 = configMAX_SYSCALL_INTERRUPT_PRIORITY */
+        "	msr basepri, r0									\n"/* Disable interrupts upto configMAX_SYSCALL_INTERRUPT_PRIORITY. */
+        "	dsb												\n"
+        "	isb												\n"
+        "	bl vTaskSwitchContext							\n"
+        "	mov r0, #0										\n"/* r0 = 0. */
+        "	msr basepri, r0									\n"/* Enable interrupts. */
+        "													\n"
+        "	ldr r2, pxCurrentTCBConst						\n"/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+        "	ldr r1, [r2]									\n"/* Read pxCurrentTCB. */
+        "	ldr r0, [r1]									\n"/* The first item in pxCurrentTCB is the task top of stack. r0 now points to the top of stack. */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	dmb												\n"/* Complete outstanding transfers before disabling MPU. */
+            "	ldr r2, xMPUCTRLConst							\n"/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r4, [r2]									\n"/* Read the value of MPU_CTRL. */
+            "	bic r4, #1										\n"/* r4 = r4 & ~1 i.e. Clear the bit 0 in r4. */
+            "	str r4, [r2]									\n"/* Disable MPU. */
+            "													\n"
+            "	adds r1, #4										\n"/* r1 = r1 + 4. r1 now points to MAIR0 in TCB. */
+            "	ldr r3, [r1]									\n"/* r3 = *r1 i.e. r3 = MAIR0. */
+            "	ldr r2, xMAIR0Const								\n"/* r2 = 0xe000edc0 [Location of MAIR0]. */
+            "	str r3, [r2]									\n"/* Program MAIR0. */
+            "	ldr r2, xRNRConst								\n"/* r2 = 0xe000ed98 [Location of RNR]. */
+            "	movs r3, #4										\n"/* r3 = 4. */
+            "	str r3, [r2]									\n"/* Program RNR = 4. */
+            "	adds r1, #4										\n"/* r1 = r1 + 4. r1 now points to first RBAR in TCB. */
+            "	ldr r2, xRBARConst								\n"/* r2 = 0xe000ed9c [Location of RBAR]. */
+            "	ldmia r1!, {r4-r11}								\n"/* Read 4 sets of RBAR/RLAR registers from TCB. */
+            "	stmia r2!, {r4-r11}								\n"/* Write 4 set of RBAR/RLAR registers using alias registers. */
+            "													\n"
+            "	ldr r2, xMPUCTRLConst							\n"/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+            "	ldr r4, [r2]									\n"/* Read the value of MPU_CTRL. */
+            "	orr r4, #1										\n"/* r4 = r4 | 1 i.e. Set the bit 0 in r4. */
+            "	str r4, [r2]									\n"/* Enable MPU. */
+            "	dsb												\n"/* Force memory writes before continuing. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	ldmia r0!, {r1-r11}								\n"/* Read from stack - r1 = PSPLIM, r2 = CONTROL, r3 = LR and r4-r11 restored. */
+        #else /* configENABLE_MPU */
+            "	ldmia r0!, {r2-r11}								\n"/* Read from stack - r2 = PSPLIM, r3 = LR and r4-r11 restored. */
+        #endif /* configENABLE_MPU */
+        "													\n"
+        #if ( configENABLE_FPU == 1 )
+            "	tst r3, #0x10									\n"/* Test Bit[4] in LR. Bit[4] of EXC_RETURN is 0 if the FPU is in use. */
+            "	it eq											\n"
+            "	vldmiaeq r0!, {s16-s31}							\n"/* Restore the FPU registers which are not restored automatically. */
+        #endif /* configENABLE_FPU */
+        "													\n"
+        #if ( configENABLE_MPU == 1 )
+            "	msr psplim, r1									\n"/* Restore the PSPLIM register value for the task. */
+            "	msr control, r2									\n"/* Restore the CONTROL register value for the task. */
+        #else /* configENABLE_MPU */
+            "	msr psplim, r2									\n"/* Restore the PSPLIM register value for the task. */
+        #endif /* configENABLE_MPU */
+        "	msr psp, r0										\n"/* Remember the new top of stack for the task. */
+        "	bx r3											\n"
+        "													\n"
+        "	.align 4										\n"
+        "pxCurrentTCBConst: .word pxCurrentTCB				\n"
+        #if ( configENABLE_MPU == 1 )
+            "xMPUCTRLConst: .word 0xe000ed94					\n"
+            "xMAIR0Const: .word 0xe000edc0						\n"
+            "xRNRConst: .word 0xe000ed98						\n"
+            "xRBARConst: .word 0xe000ed9c						\n"
+        #endif /* configENABLE_MPU */
+        ::"i" ( configMAX_SYSCALL_INTERRUPT_PRIORITY )
+    );
+}
+/*-----------------------------------------------------------*/
+
+void SVC_Handler( void ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */
+{
+    __asm volatile
+    (
+        "	tst lr, #4										\n"
+        "	ite eq											\n"
+        "	mrseq r0, msp									\n"
+        "	mrsne r0, psp									\n"
+        "	ldr r1, svchandler_address_const				\n"
+        "	bx r1											\n"
+        "													\n"
+        "	.align 4										\n"
+        "svchandler_address_const: .word vPortSVCHandler_C	\n"
+    );
+}
+/*-----------------------------------------------------------*/

freertos/Source/portable/ARMv8M/non_secure/portable/GCC/ARM_CM33_NTZ/portmacro.h

@@ -0,0 +1,310 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef PORTMACRO_H
+    #define PORTMACRO_H
+
+    #ifdef __cplusplus
+        extern "C" {
+    #endif
+
+/*------------------------------------------------------------------------------
+ * Port specific definitions.
+ *
+ * The settings in this file configure FreeRTOS correctly for the given hardware
+ * and compiler.
+ *
+ * These settings should not be altered.
+ *------------------------------------------------------------------------------
+ */
+
+    #ifndef configENABLE_FPU
+        #error configENABLE_FPU must be defined in FreeRTOSConfig.h.  Set configENABLE_FPU to 1 to enable the FPU or 0 to disable the FPU.
+    #endif /* configENABLE_FPU */
+
+    #ifndef configENABLE_MPU
+        #error configENABLE_MPU must be defined in FreeRTOSConfig.h.  Set configENABLE_MPU to 1 to enable the MPU or 0 to disable the MPU.
+    #endif /* configENABLE_MPU */
+
+    #ifndef configENABLE_TRUSTZONE
+        #error configENABLE_TRUSTZONE must be defined in FreeRTOSConfig.h.  Set configENABLE_TRUSTZONE to 1 to enable TrustZone or 0 to disable TrustZone.
+    #endif /* configENABLE_TRUSTZONE */
+
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Type definitions.
+ */
+    #define portCHAR          char
+    #define portFLOAT         float
+    #define portDOUBLE        double
+    #define portLONG          long
+    #define portSHORT         short
+    #define portSTACK_TYPE    uint32_t
+    #define portBASE_TYPE     long
+
+    typedef portSTACK_TYPE   StackType_t;
+    typedef long             BaseType_t;
+    typedef unsigned long    UBaseType_t;
+
+    #if ( configUSE_16_BIT_TICKS == 1 )
+        typedef uint16_t     TickType_t;
+        #define portMAX_DELAY              ( TickType_t ) 0xffff
+    #else
+        typedef uint32_t     TickType_t;
+        #define portMAX_DELAY              ( TickType_t ) 0xffffffffUL
+
+/* 32-bit tick type on a 32-bit architecture, so reads of the tick count do
+ * not need to be guarded with a critical section. */
+        #define portTICK_TYPE_IS_ATOMIC    1
+    #endif
+/*-----------------------------------------------------------*/
+
+/**
+ * Architecture specifics.
+ */
+    #define portARCH_NAME                      "Cortex-M33"
+    #define portSTACK_GROWTH                   ( -1 )
+    #define portTICK_PERIOD_MS                 ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
+    #define portBYTE_ALIGNMENT                 8
+    #define portNOP()
+    #define portINLINE                         __inline
+    #ifndef portFORCE_INLINE
+        #define portFORCE_INLINE               inline __attribute__( ( always_inline ) )
+    #endif
+    #define portHAS_STACK_OVERFLOW_CHECKING    1
+    #define portDONT_DISCARD                   __attribute__( ( used ) )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Extern declarations.
+ */
+    extern BaseType_t xPortIsInsideInterrupt( void );
+
+    extern void vPortYield( void ) /* PRIVILEGED_FUNCTION */;
+
+    extern void vPortEnterCritical( void ) /* PRIVILEGED_FUNCTION */;
+    extern void vPortExitCritical( void ) /* PRIVILEGED_FUNCTION */;
+
+    extern uint32_t ulSetInterruptMask( void ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */;
+    extern void vClearInterruptMask( uint32_t ulMask ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */;
+
+    #if ( configENABLE_TRUSTZONE == 1 )
+        extern void vPortAllocateSecureContext( uint32_t ulSecureStackSize ); /* __attribute__ (( naked )) */
+        extern void vPortFreeSecureContext( uint32_t * pulTCB ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */;
+    #endif /* configENABLE_TRUSTZONE */
+
+    #if ( configENABLE_MPU == 1 )
+        extern BaseType_t xIsPrivileged( void ) /* __attribute__ (( naked )) */;
+        extern void vResetPrivilege( void ) /* __attribute__ (( naked )) */;
+    #endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief MPU specific constants.
+ */
+    #if ( configENABLE_MPU == 1 )
+        #define portUSING_MPU_WRAPPERS    1
+        #define portPRIVILEGE_BIT         ( 0x80000000UL )
+    #else
+        #define portPRIVILEGE_BIT         ( 0x0UL )
+    #endif /* configENABLE_MPU */
+
+
+/* MPU regions. */
+    #define portPRIVILEGED_FLASH_REGION                   ( 0UL )
+    #define portUNPRIVILEGED_FLASH_REGION                 ( 1UL )
+    #define portUNPRIVILEGED_SYSCALLS_REGION              ( 2UL )
+    #define portPRIVILEGED_RAM_REGION                     ( 3UL )
+    #define portSTACK_REGION                              ( 4UL )
+    #define portFIRST_CONFIGURABLE_REGION                 ( 5UL )
+    #define portLAST_CONFIGURABLE_REGION                  ( 7UL )
+    #define portNUM_CONFIGURABLE_REGIONS                  ( ( portLAST_CONFIGURABLE_REGION - portFIRST_CONFIGURABLE_REGION ) + 1 )
+    #define portTOTAL_NUM_REGIONS                         ( portNUM_CONFIGURABLE_REGIONS + 1 )   /* Plus one to make space for the stack region. */
+
+/* Device memory attributes used in MPU_MAIR registers.
+ *
+ * 8-bit values encoded as follows:
+ *  Bit[7:4] - 0000 - Device Memory
+ *  Bit[3:2] - 00 --> Device-nGnRnE
+ *				01 --> Device-nGnRE
+ *				10 --> Device-nGRE
+ *				11 --> Device-GRE
+ *  Bit[1:0] - 00, Reserved.
+ */
+    #define portMPU_DEVICE_MEMORY_nGnRnE                  ( 0x00 )   /* 0000 0000 */
+    #define portMPU_DEVICE_MEMORY_nGnRE                   ( 0x04 )   /* 0000 0100 */
+    #define portMPU_DEVICE_MEMORY_nGRE                    ( 0x08 )   /* 0000 1000 */
+    #define portMPU_DEVICE_MEMORY_GRE                     ( 0x0C )   /* 0000 1100 */
+
+/* Normal memory attributes used in MPU_MAIR registers. */
+    #define portMPU_NORMAL_MEMORY_NON_CACHEABLE           ( 0x44 )   /* Non-cacheable. */
+    #define portMPU_NORMAL_MEMORY_BUFFERABLE_CACHEABLE    ( 0xFF )   /* Non-Transient, Write-back, Read-Allocate and Write-Allocate. */
+
+/* Attributes used in MPU_RBAR registers. */
+    #define portMPU_REGION_NON_SHAREABLE                  ( 0UL << 3UL )
+    #define portMPU_REGION_INNER_SHAREABLE                ( 1UL << 3UL )
+    #define portMPU_REGION_OUTER_SHAREABLE                ( 2UL << 3UL )
+
+    #define portMPU_REGION_PRIVILEGED_READ_WRITE          ( 0UL << 1UL )
+    #define portMPU_REGION_READ_WRITE                     ( 1UL << 1UL )
+    #define portMPU_REGION_PRIVILEGED_READ_ONLY           ( 2UL << 1UL )
+    #define portMPU_REGION_READ_ONLY                      ( 3UL << 1UL )
+
+    #define portMPU_REGION_EXECUTE_NEVER                  ( 1UL )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Settings to define an MPU region.
+ */
+    typedef struct MPURegionSettings
+    {
+        uint32_t ulRBAR; /**< RBAR for the region. */
+        uint32_t ulRLAR; /**< RLAR for the region. */
+    } MPURegionSettings_t;
+
+/**
+ * @brief MPU settings as stored in the TCB.
+ */
+    typedef struct MPU_SETTINGS
+    {
+        uint32_t ulMAIR0;                                              /**< MAIR0 for the task containing attributes for all the 4 per task regions. */
+        MPURegionSettings_t xRegionsSettings[ portTOTAL_NUM_REGIONS ]; /**< Settings for 4 per task regions. */
+    } xMPU_SETTINGS;
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief SVC numbers.
+ */
+    #define portSVC_ALLOCATE_SECURE_CONTEXT    0
+    #define portSVC_FREE_SECURE_CONTEXT        1
+    #define portSVC_START_SCHEDULER            2
+    #define portSVC_RAISE_PRIVILEGE            3
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Scheduler utilities.
+ */
+    #define portYIELD()                                 vPortYield()
+    #define portNVIC_INT_CTRL_REG     ( *( ( volatile uint32_t * ) 0xe000ed04 ) )
+    #define portNVIC_PENDSVSET_BIT    ( 1UL << 28UL )
+    #define portEND_SWITCHING_ISR( xSwitchRequired )    do { if( xSwitchRequired ) portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT; } while( 0 )
+    #define portYIELD_FROM_ISR( x )                     portEND_SWITCHING_ISR( x )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Critical section management.
+ */
+    #define portSET_INTERRUPT_MASK_FROM_ISR()         ulSetInterruptMask()
+    #define portCLEAR_INTERRUPT_MASK_FROM_ISR( x )    vClearInterruptMask( x )
+    #define portDISABLE_INTERRUPTS()                  ulSetInterruptMask()
+    #define portENABLE_INTERRUPTS()                   vClearInterruptMask( 0 )
+    #define portENTER_CRITICAL()                      vPortEnterCritical()
+    #define portEXIT_CRITICAL()                       vPortExitCritical()
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Tickless idle/low power functionality.
+ */
+    #ifndef portSUPPRESS_TICKS_AND_SLEEP
+        extern void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime );
+        #define portSUPPRESS_TICKS_AND_SLEEP( xExpectedIdleTime )    vPortSuppressTicksAndSleep( xExpectedIdleTime )
+    #endif
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Task function macros as described on the FreeRTOS.org WEB site.
+ */
+    #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
+    #define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )
+/*-----------------------------------------------------------*/
+
+    #if ( configENABLE_TRUSTZONE == 1 )
+
+/**
+ * @brief Allocate a secure context for the task.
+ *
+ * Tasks are not created with a secure context. Any task that is going to call
+ * secure functions must call portALLOCATE_SECURE_CONTEXT() to allocate itself a
+ * secure context before it calls any secure function.
+ *
+ * @param[in] ulSecureStackSize The size of the secure stack to be allocated.
+ */
+        #define portALLOCATE_SECURE_CONTEXT( ulSecureStackSize )    vPortAllocateSecureContext( ulSecureStackSize )
+
+/**
+ * @brief Called when a task is deleted to delete the task's secure context,
+ * if it has one.
+ *
+ * @param[in] pxTCB The TCB of the task being deleted.
+ */
+        #define portCLEAN_UP_TCB( pxTCB )                           vPortFreeSecureContext( ( uint32_t * ) pxTCB )
+    #endif /* configENABLE_TRUSTZONE */
+/*-----------------------------------------------------------*/
+
+    #if ( configENABLE_MPU == 1 )
+
+/**
+ * @brief Checks whether or not the processor is privileged.
+ *
+ * @return 1 if the processor is already privileged, 0 otherwise.
+ */
+        #define portIS_PRIVILEGED()      xIsPrivileged()
+
+/**
+ * @brief Raise an SVC request to raise privilege.
+ *
+ * The SVC handler checks that the SVC was raised from a system call and only
+ * then it raises the privilege. If this is called from any other place,
+ * the privilege is not raised.
+ */
+        #define portRAISE_PRIVILEGE()    __asm volatile ( "svc %0 \n" ::"i" ( portSVC_RAISE_PRIVILEGE ) : "memory" );
+
+/**
+ * @brief Lowers the privilege level by setting the bit 0 of the CONTROL
+ * register.
+ */
+        #define portRESET_PRIVILEGE()    vResetPrivilege()
+    #else
+        #define portIS_PRIVILEGED()
+        #define portRAISE_PRIVILEGE()
+        #define portRESET_PRIVILEGE()
+    #endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Barriers.
+ */
+    #define portMEMORY_BARRIER()    __asm volatile ( "" ::: "memory" )
+/*-----------------------------------------------------------*/
+
+    #ifdef __cplusplus
+        }
+    #endif
+
+#endif /* PORTMACRO_H */

freertos/Source/portable/ARMv8M/non_secure/portable/IAR/ARM_CM23/portasm.s

@@ -0,0 +1,391 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+/* Including FreeRTOSConfig.h here will cause build errors if the header file
+contains code not understood by the assembler - for example the 'extern' keyword.
+To avoid errors place any such code inside a #ifdef __ICCARM__/#endif block so
+the code is included in C files but excluded by the preprocessor in assembly
+files (__ICCARM__ is defined by the IAR C compiler but not by the IAR assembler. */
+#include "FreeRTOSConfig.h"
+
+	EXTERN pxCurrentTCB
+	EXTERN xSecureContext
+	EXTERN vTaskSwitchContext
+	EXTERN vPortSVCHandler_C
+	EXTERN SecureContext_SaveContext
+	EXTERN SecureContext_LoadContext
+
+	PUBLIC xIsPrivileged
+	PUBLIC vResetPrivilege
+	PUBLIC vPortAllocateSecureContext
+	PUBLIC vRestoreContextOfFirstTask
+	PUBLIC vRaisePrivilege
+	PUBLIC vStartFirstTask
+	PUBLIC ulSetInterruptMask
+	PUBLIC vClearInterruptMask
+	PUBLIC PendSV_Handler
+	PUBLIC SVC_Handler
+	PUBLIC vPortFreeSecureContext
+
+#if ( configENABLE_FPU == 1 )
+	#error Cortex-M23 does not have a Floating Point Unit (FPU) and therefore configENABLE_FPU must be set to 0.
+#endif
+/*-----------------------------------------------------------*/
+
+/*---------------- Unprivileged Functions -------------------*/
+
+/*-----------------------------------------------------------*/
+
+	SECTION .text:CODE:NOROOT(2)
+	THUMB
+/*-----------------------------------------------------------*/
+
+xIsPrivileged:
+	mrs r0, control							/* r0 = CONTROL. */
+	movs r1, #1								/* r1 = 1. */
+	tst r0, r1								/* Perform r0 & r1 (bitwise AND) and update the conditions flag. */
+	beq running_privileged					/* If the result of previous AND operation was 0, branch. */
+	movs r0, #0								/* CONTROL[0]!=0. Return false to indicate that the processor is not privileged. */
+	bx lr									/* Return. */
+	running_privileged:
+		movs r0, #1							/* CONTROL[0]==0. Return true to indicate that the processor is privileged. */
+		bx lr								/* Return. */
+/*-----------------------------------------------------------*/
+
+vResetPrivilege:
+	mrs r0, control							/* r0 = CONTROL. */
+	movs r1, #1								/* r1 = 1. */
+	orrs r0, r1								/* r0 = r0 | r1. */
+	msr control, r0							/* CONTROL = r0. */
+	bx lr									/* Return to the caller. */
+/*-----------------------------------------------------------*/
+
+vPortAllocateSecureContext:
+	svc 0									/* Secure context is allocated in the supervisor call. portSVC_ALLOCATE_SECURE_CONTEXT = 0. */
+	bx lr									/* Return. */
+/*-----------------------------------------------------------*/
+
+/*----------------- Privileged Functions --------------------*/
+
+/*-----------------------------------------------------------*/
+
+	SECTION privileged_functions:CODE:NOROOT(2)
+	THUMB
+/*-----------------------------------------------------------*/
+
+vRestoreContextOfFirstTask:
+	ldr  r2, =pxCurrentTCB					/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+	ldr  r3, [r2]							/* Read pxCurrentTCB. */
+	ldr  r0, [r3]							/* Read top of stack from TCB - The first item in pxCurrentTCB is the task top of stack. */
+
+#if ( configENABLE_MPU == 1 )
+	dmb										/* Complete outstanding transfers before disabling MPU. */
+	ldr r2, =0xe000ed94						/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+	ldr r4, [r2]							/* Read the value of MPU_CTRL. */
+	movs r5, #1								/* r5 = 1. */
+	bics r4, r5								/* r4 = r4 & ~r5 i.e. Clear the bit 0 in r4. */
+	str r4, [r2]							/* Disable MPU. */
+
+	adds r3, #4								/* r3 = r3 + 4. r3 now points to MAIR0 in TCB. */
+	ldr  r4, [r3]							/* r4 = *r3 i.e. r4 = MAIR0. */
+	ldr  r2, =0xe000edc0					/* r2 = 0xe000edc0 [Location of MAIR0]. */
+	str  r4, [r2]							/* Program MAIR0. */
+	ldr  r2, =0xe000ed98					/* r2 = 0xe000ed98 [Location of RNR]. */
+	adds r3, #4								/* r3 = r3 + 4. r3 now points to first RBAR in TCB. */
+	movs r5, #4								/* r5 = 4. */
+	str  r5, [r2]							/* Program RNR = 4. */
+	ldmia r3!, {r6,r7}						/* Read first set of RBAR/RLAR from TCB. */
+	ldr  r4, =0xe000ed9c					/* r4 = 0xe000ed9c [Location of RBAR]. */
+	stmia r4!, {r6,r7}						/* Write first set of RBAR/RLAR registers. */
+	movs r5, #5								/* r5 = 5. */
+	str  r5, [r2]							/* Program RNR = 5. */
+	ldmia r3!, {r6,r7}						/* Read second set of RBAR/RLAR from TCB. */
+	ldr  r4, =0xe000ed9c					/* r4 = 0xe000ed9c [Location of RBAR]. */
+	stmia r4!, {r6,r7}						/* Write second set of RBAR/RLAR registers. */
+	movs r5, #6								/* r5 = 6. */
+	str  r5, [r2]							/* Program RNR = 6. */
+	ldmia r3!, {r6,r7}						/* Read third set of RBAR/RLAR from TCB. */
+	ldr  r4, =0xe000ed9c					/* r4 = 0xe000ed9c [Location of RBAR]. */
+	stmia r4!, {r6,r7}						/* Write third set of RBAR/RLAR registers. */
+	movs r5, #7								/* r5 = 7. */
+	str  r5, [r2]							/* Program RNR = 7. */
+	ldmia r3!, {r6,r7}						/* Read fourth set of RBAR/RLAR from TCB. */
+	ldr  r4, =0xe000ed9c					/* r4 = 0xe000ed9c [Location of RBAR]. */
+	stmia r4!, {r6,r7}						/* Write fourth set of RBAR/RLAR registers. */
+
+	ldr r2, =0xe000ed94						/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+	ldr r4, [r2]							/* Read the value of MPU_CTRL. */
+	movs r5, #1								/* r5 = 1. */
+	orrs r4, r5								/* r4 = r4 | r5 i.e. Set the bit 0 in r4. */
+	str r4, [r2]							/* Enable MPU. */
+	dsb										/* Force memory writes before continuing. */
+#endif /* configENABLE_MPU */
+
+#if ( configENABLE_MPU == 1 )
+	ldm  r0!, {r1-r4}						/* Read from stack - r1 = xSecureContext, r2 = PSPLIM, r3 = CONTROL and r4 = EXC_RETURN. */
+	ldr  r5, =xSecureContext
+	str  r1, [r5]							/* Set xSecureContext to this task's value for the same. */
+	msr  psplim, r2							/* Set this task's PSPLIM value. */
+	msr  control, r3						/* Set this task's CONTROL value. */
+	adds r0, #32							/* Discard everything up to r0. */
+	msr  psp, r0							/* This is now the new top of stack to use in the task. */
+	isb
+	bx   r4									/* Finally, branch to EXC_RETURN. */
+#else /* configENABLE_MPU */
+	ldm  r0!, {r1-r3}						/* Read from stack - r1 = xSecureContext, r2 = PSPLIM and r3 = EXC_RETURN. */
+	ldr  r4, =xSecureContext
+	str  r1, [r4]							/* Set xSecureContext to this task's value for the same. */
+	msr  psplim, r2							/* Set this task's PSPLIM value. */
+	movs r1, #2								/* r1 = 2. */
+	msr  CONTROL, r1						/* Switch to use PSP in the thread mode. */
+	adds r0, #32							/* Discard everything up to r0. */
+	msr  psp, r0							/* This is now the new top of stack to use in the task. */
+	isb
+	bx   r3									/* Finally, branch to EXC_RETURN. */
+#endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+vRaisePrivilege:
+	mrs r0, control							/* Read the CONTROL register. */
+	movs r1, #1								/* r1 = 1. */
+	bics r0, r1								/* Clear the bit 0. */
+	msr control, r0							/* Write back the new CONTROL value. */
+	bx lr									/* Return to the caller. */
+/*-----------------------------------------------------------*/
+
+vStartFirstTask:
+	ldr r0, =0xe000ed08						/* Use the NVIC offset register to locate the stack. */
+	ldr r0, [r0]							/* Read the VTOR register which gives the address of vector table. */
+	ldr r0, [r0]							/* The first entry in vector table is stack pointer. */
+	msr msp, r0								/* Set the MSP back to the start of the stack. */
+	cpsie i									/* Globally enable interrupts. */
+	dsb
+	isb
+	svc 2									/* System call to start the first task. portSVC_START_SCHEDULER = 2. */
+/*-----------------------------------------------------------*/
+
+ulSetInterruptMask:
+	mrs r0, PRIMASK
+	cpsid i
+	bx lr
+/*-----------------------------------------------------------*/
+
+vClearInterruptMask:
+	msr PRIMASK, r0
+	bx lr
+/*-----------------------------------------------------------*/
+
+PendSV_Handler:
+	ldr r3, =xSecureContext					/* Read the location of xSecureContext i.e. &( xSecureContext ). */
+	ldr r0, [r3]							/* Read xSecureContext - Value of xSecureContext must be in r0 as it is used as a parameter later. */
+	ldr r3, =pxCurrentTCB					/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+	ldr r1, [r3]							/* Read pxCurrentTCB - Value of pxCurrentTCB must be in r1 as it is used as a parameter later. */
+	mrs r2, psp								/* Read PSP in r2. */
+
+	cbz r0, save_ns_context					/* No secure context to save. */
+	push {r0-r2, r14}
+	bl SecureContext_SaveContext			/* Params are in r0 and r1. r0 = xSecureContext and r1 = pxCurrentTCB. */
+	pop {r0-r3}								/* LR is now in r3. */
+	mov lr, r3								/* LR = r3. */
+	lsls r1, r3, #25						/* r1 = r3 << 25. Bit[6] of EXC_RETURN is 1 if secure stack was used, 0 if non-secure stack was used to store stack frame. */
+	bpl save_ns_context						/* bpl - branch if positive or zero. If r1 >= 0 ==> Bit[6] in EXC_RETURN is 0 i.e. non-secure stack was used. */
+	ldr r3, =pxCurrentTCB					/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+	ldr r1, [r3]							/* Read pxCurrentTCB. */
+#if ( configENABLE_MPU == 1 )
+	subs r2, r2, #16						/* Make space for xSecureContext, PSPLIM, CONTROL and LR on the stack. */
+	str r2, [r1]							/* Save the new top of stack in TCB. */
+	mrs r1, psplim							/* r1 = PSPLIM. */
+	mrs r3, control							/* r3 = CONTROL. */
+	mov r4, lr								/* r4 = LR/EXC_RETURN. */
+	stmia r2!, {r0, r1, r3, r4}				/* Store xSecureContext, PSPLIM, CONTROL and LR on the stack. */
+#else /* configENABLE_MPU */
+	subs r2, r2, #12						/* Make space for xSecureContext, PSPLIM and LR on the stack. */
+	str r2, [r1]							/* Save the new top of stack in TCB. */
+	mrs r1, psplim							/* r1 = PSPLIM. */
+	mov r3, lr								/* r3 = LR/EXC_RETURN. */
+	stmia r2!, {r0, r1, r3}					/* Store xSecureContext, PSPLIM and LR on the stack. */
+#endif /* configENABLE_MPU */
+	b select_next_task
+
+	save_ns_context:
+		ldr r3, =pxCurrentTCB				/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+		ldr r1, [r3]						/* Read pxCurrentTCB. */
+	#if ( configENABLE_MPU == 1 )
+		subs r2, r2, #48					/* Make space for xSecureContext, PSPLIM, CONTROL, LR and the remaining registers on the stack. */
+		str r2, [r1]						/* Save the new top of stack in TCB. */
+		adds r2, r2, #16					/* r2 = r2 + 16. */
+		stmia r2!, {r4-r7}					/* Store the low registers that are not saved automatically. */
+		mov r4, r8							/* r4 = r8. */
+		mov r5, r9							/* r5 = r9. */
+		mov r6, r10							/* r6 = r10. */
+		mov r7, r11							/* r7 = r11. */
+		stmia r2!, {r4-r7}					/* Store the high registers that are not saved automatically. */
+		mrs r1, psplim						/* r1 = PSPLIM. */
+		mrs r3, control						/* r3 = CONTROL. */
+		mov r4, lr							/* r4 = LR/EXC_RETURN. */
+		subs r2, r2, #48					/* r2 = r2 - 48. */
+		stmia r2!, {r0, r1, r3, r4}			/* Store xSecureContext, PSPLIM, CONTROL and LR on the stack. */
+	#else /* configENABLE_MPU */
+		subs r2, r2, #44					/* Make space for xSecureContext, PSPLIM, LR and the remaining registers on the stack. */
+		str r2, [r1]						/* Save the new top of stack in TCB. */
+		mrs r1, psplim						/* r1 = PSPLIM. */
+		mov r3, lr							/* r3 = LR/EXC_RETURN. */
+		stmia r2!, {r0, r1, r3-r7}			/* Store xSecureContext, PSPLIM, LR and the low registers that are not saved automatically. */
+		mov r4, r8							/* r4 = r8. */
+		mov r5, r9							/* r5 = r9. */
+		mov r6, r10							/* r6 = r10. */
+		mov r7, r11							/* r7 = r11. */
+		stmia r2!, {r4-r7}					/* Store the high registers that are not saved automatically. */
+	#endif /* configENABLE_MPU */
+
+	select_next_task:
+		cpsid i
+		bl vTaskSwitchContext
+		cpsie i
+
+		ldr r3, =pxCurrentTCB				/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+		ldr r1, [r3]						/* Read pxCurrentTCB. */
+		ldr r2, [r1]						/* The first item in pxCurrentTCB is the task top of stack. r2 now points to the top of stack. */
+
+	#if ( configENABLE_MPU == 1 )
+		dmb									/* Complete outstanding transfers before disabling MPU. */
+		ldr r3, =0xe000ed94					/* r3 = 0xe000ed94 [Location of MPU_CTRL]. */
+		ldr r4, [r3]						/* Read the value of MPU_CTRL. */
+		movs r5, #1							/* r5 = 1. */
+		bics r4, r5							/* r4 = r4 & ~r5 i.e. Clear the bit 0 in r4. */
+		str r4, [r3]						/* Disable MPU. */
+
+		adds r1, #4							/* r1 = r1 + 4. r1 now points to MAIR0 in TCB. */
+		ldr r4, [r1]						/* r4 = *r1 i.e. r4 = MAIR0. */
+		ldr r3, =0xe000edc0					/* r3 = 0xe000edc0 [Location of MAIR0]. */
+		str r4, [r3]						/* Program MAIR0. */
+		ldr r4, =0xe000ed98					/* r4 = 0xe000ed98 [Location of RNR]. */
+		adds r1, #4							/* r1 = r1 + 4. r1 now points to first RBAR in TCB. */
+		movs r5, #4							/* r5 = 4. */
+		str  r5, [r4]						/* Program RNR = 4. */
+		ldmia r1!, {r6,r7}					/* Read first set of RBAR/RLAR from TCB. */
+		ldr  r3, =0xe000ed9c				/* r3 = 0xe000ed9c [Location of RBAR]. */
+		stmia r3!, {r6,r7}					/* Write first set of RBAR/RLAR registers. */
+		movs r5, #5							/* r5 = 5. */
+		str  r5, [r4]						/* Program RNR = 5. */
+		ldmia r1!, {r6,r7}					/* Read second set of RBAR/RLAR from TCB. */
+		ldr  r3, =0xe000ed9c				/* r3 = 0xe000ed9c [Location of RBAR]. */
+		stmia r3!, {r6,r7}					/* Write second set of RBAR/RLAR registers. */
+		movs r5, #6							/* r5 = 6. */
+		str  r5, [r4]						/* Program RNR = 6. */
+		ldmia r1!, {r6,r7}					/* Read third set of RBAR/RLAR from TCB. */
+		ldr  r3, =0xe000ed9c				/* r3 = 0xe000ed9c [Location of RBAR]. */
+		stmia r3!, {r6,r7}					/* Write third set of RBAR/RLAR registers. */
+		movs r5, #7							/* r5 = 7. */
+		str  r5, [r4]						/* Program RNR = 7. */
+		ldmia r1!, {r6,r7}					/* Read fourth set of RBAR/RLAR from TCB. */
+		ldr  r3, =0xe000ed9c				/* r3 = 0xe000ed9c [Location of RBAR]. */
+		stmia r3!, {r6,r7}					/* Write fourth set of RBAR/RLAR registers. */
+
+		ldr r3, =0xe000ed94					/* r3 = 0xe000ed94 [Location of MPU_CTRL]. */
+		ldr r4, [r3]						/* Read the value of MPU_CTRL. */
+		movs r5, #1							/* r5 = 1. */
+		orrs r4, r5							/* r4 = r4 | r5 i.e. Set the bit 0 in r4. */
+		str r4, [r3]						/* Enable MPU. */
+		dsb									/* Force memory writes before continuing. */
+	#endif /* configENABLE_MPU */
+
+	#if ( configENABLE_MPU == 1 )
+		ldmia r2!, {r0, r1, r3, r4}			/* Read from stack - r0 = xSecureContext, r1 = PSPLIM, r3 = CONTROL and r4 = LR. */
+		msr psplim, r1						/* Restore the PSPLIM register value for the task. */
+		msr control, r3						/* Restore the CONTROL register value for the task. */
+		mov lr, r4							/* LR = r4. */
+		ldr r3, =xSecureContext				/* Read the location of xSecureContext i.e. &( xSecureContext ). */
+		str r0, [r3]						/* Restore the task's xSecureContext. */
+		cbz r0, restore_ns_context			/* If there is no secure context for the task, restore the non-secure context. */
+		ldr r3, =pxCurrentTCB				/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+		ldr r1, [r3]						/* Read pxCurrentTCB. */
+		push {r2, r4}
+		bl SecureContext_LoadContext		/* Restore the secure context. Params are in r0 and r1. r0 = xSecureContext and r1 = pxCurrentTCB. */
+		pop {r2, r4}
+		mov lr, r4							/* LR = r4. */
+		lsls r1, r4, #25					/* r1 = r4 << 25. Bit[6] of EXC_RETURN is 1 if secure stack was used, 0 if non-secure stack was used to store stack frame. */
+		bpl restore_ns_context				/* bpl - branch if positive or zero. If r1 >= 0 ==> Bit[6] in EXC_RETURN is 0 i.e. non-secure stack was used. */
+		msr psp, r2							/* Remember the new top of stack for the task. */
+		bx lr
+	#else /* configENABLE_MPU */
+		ldmia r2!, {r0, r1, r4}				/* Read from stack - r0 = xSecureContext, r1 = PSPLIM and r4 = LR. */
+		msr psplim, r1						/* Restore the PSPLIM register value for the task. */
+		mov lr, r4							/* LR = r4. */
+		ldr r3, =xSecureContext				/* Read the location of xSecureContext i.e. &( xSecureContext ). */
+		str r0, [r3]						/* Restore the task's xSecureContext. */
+		cbz r0, restore_ns_context			/* If there is no secure context for the task, restore the non-secure context. */
+		ldr r3, =pxCurrentTCB				/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+		ldr r1, [r3]						/* Read pxCurrentTCB. */
+		push {r2, r4}
+		bl SecureContext_LoadContext		/* Restore the secure context. Params are in r0 and r1. r0 = xSecureContext and r1 = pxCurrentTCB. */
+		pop {r2, r4}
+		mov lr, r4							/* LR = r4. */
+		lsls r1, r4, #25					/* r1 = r4 << 25. Bit[6] of EXC_RETURN is 1 if secure stack was used, 0 if non-secure stack was used to store stack frame. */
+		bpl restore_ns_context				/* bpl - branch if positive or zero. If r1 >= 0 ==> Bit[6] in EXC_RETURN is 0 i.e. non-secure stack was used. */
+		msr psp, r2							/* Remember the new top of stack for the task. */
+		bx lr
+	#endif /* configENABLE_MPU */
+
+	restore_ns_context:
+		adds r2, r2, #16					/* Move to the high registers. */
+		ldmia r2!, {r4-r7}					/* Restore the high registers that are not automatically restored. */
+		mov r8, r4							/* r8 = r4. */
+		mov r9, r5							/* r9 = r5. */
+		mov r10, r6							/* r10 = r6. */
+		mov r11, r7							/* r11 = r7. */
+		msr psp, r2							/* Remember the new top of stack for the task. */
+		subs r2, r2, #32					/* Go back to the low registers. */
+		ldmia r2!, {r4-r7}					/* Restore the low registers that are not automatically restored. */
+		bx lr
+/*-----------------------------------------------------------*/
+
+SVC_Handler:
+	movs r0, #4
+	mov r1, lr
+	tst r0, r1
+	beq stacking_used_msp
+	mrs r0, psp
+	b vPortSVCHandler_C
+	stacking_used_msp:
+		mrs r0, msp
+		b vPortSVCHandler_C
+/*-----------------------------------------------------------*/
+
+vPortFreeSecureContext:
+	ldr r2, [r0]							/* The first item in the TCB is the top of the stack. */
+	ldr r1, [r2]							/* The first item on the stack is the task's xSecureContext. */
+	cmp r1, #0								/* Raise svc if task's xSecureContext is not NULL. */
+	bne free_secure_context					/* Branch if r1 != 0. */
+	bx lr									/* There is no secure context (xSecureContext is NULL). */
+	free_secure_context:
+		svc 1								/* Secure context is freed in the supervisor call. portSVC_FREE_SECURE_CONTEXT = 1. */
+		bx lr								/* Return. */
+/*-----------------------------------------------------------*/
+
+	END

freertos/Source/portable/ARMv8M/non_secure/portable/IAR/ARM_CM23/portmacro.h

@@ -0,0 +1,317 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef PORTMACRO_H
+    #define PORTMACRO_H
+
+    #ifdef __cplusplus
+        extern "C" {
+    #endif
+
+/*------------------------------------------------------------------------------
+ * Port specific definitions.
+ *
+ * The settings in this file configure FreeRTOS correctly for the given hardware
+ * and compiler.
+ *
+ * These settings should not be altered.
+ *------------------------------------------------------------------------------
+ */
+
+    #ifndef configENABLE_FPU
+        #error configENABLE_FPU must be defined in FreeRTOSConfig.h.  Set configENABLE_FPU to 1 to enable the FPU or 0 to disable the FPU.
+    #endif /* configENABLE_FPU */
+
+    #ifndef configENABLE_MPU
+        #error configENABLE_MPU must be defined in FreeRTOSConfig.h.  Set configENABLE_MPU to 1 to enable the MPU or 0 to disable the MPU.
+    #endif /* configENABLE_MPU */
+
+    #ifndef configENABLE_TRUSTZONE
+        #error configENABLE_TRUSTZONE must be defined in FreeRTOSConfig.h.  Set configENABLE_TRUSTZONE to 1 to enable TrustZone or 0 to disable TrustZone.
+    #endif /* configENABLE_TRUSTZONE */
+
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Type definitions.
+ */
+    #define portCHAR          char
+    #define portFLOAT         float
+    #define portDOUBLE        double
+    #define portLONG          long
+    #define portSHORT         short
+    #define portSTACK_TYPE    uint32_t
+    #define portBASE_TYPE     long
+
+    typedef portSTACK_TYPE   StackType_t;
+    typedef long             BaseType_t;
+    typedef unsigned long    UBaseType_t;
+
+    #if ( configUSE_16_BIT_TICKS == 1 )
+        typedef uint16_t     TickType_t;
+        #define portMAX_DELAY              ( TickType_t ) 0xffff
+    #else
+        typedef uint32_t     TickType_t;
+        #define portMAX_DELAY              ( TickType_t ) 0xffffffffUL
+
+/* 32-bit tick type on a 32-bit architecture, so reads of the tick count do
+ * not need to be guarded with a critical section. */
+        #define portTICK_TYPE_IS_ATOMIC    1
+    #endif
+/*-----------------------------------------------------------*/
+
+/**
+ * Architecture specifics.
+ */
+    #define portARCH_NAME                      "Cortex-M23"
+    #define portSTACK_GROWTH                   ( -1 )
+    #define portTICK_PERIOD_MS                 ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
+    #define portBYTE_ALIGNMENT                 8
+    #define portNOP()
+    #define portINLINE                         __inline
+    #ifndef portFORCE_INLINE
+        #define portFORCE_INLINE               inline __attribute__( ( always_inline ) )
+    #endif
+    #define portHAS_STACK_OVERFLOW_CHECKING    1
+    #define portDONT_DISCARD                   __root
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Extern declarations.
+ */
+    extern BaseType_t xPortIsInsideInterrupt( void );
+
+    extern void vPortYield( void ) /* PRIVILEGED_FUNCTION */;
+
+    extern void vPortEnterCritical( void ) /* PRIVILEGED_FUNCTION */;
+    extern void vPortExitCritical( void ) /* PRIVILEGED_FUNCTION */;
+
+    extern uint32_t ulSetInterruptMask( void ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */;
+    extern void vClearInterruptMask( uint32_t ulMask ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */;
+
+    #if ( configENABLE_TRUSTZONE == 1 )
+        extern void vPortAllocateSecureContext( uint32_t ulSecureStackSize ); /* __attribute__ (( naked )) */
+        extern void vPortFreeSecureContext( uint32_t * pulTCB ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */;
+    #endif /* configENABLE_TRUSTZONE */
+
+    #if ( configENABLE_MPU == 1 )
+        extern BaseType_t xIsPrivileged( void ) /* __attribute__ (( naked )) */;
+        extern void vResetPrivilege( void ) /* __attribute__ (( naked )) */;
+    #endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief MPU specific constants.
+ */
+    #if ( configENABLE_MPU == 1 )
+        #define portUSING_MPU_WRAPPERS    1
+        #define portPRIVILEGE_BIT         ( 0x80000000UL )
+    #else
+        #define portPRIVILEGE_BIT         ( 0x0UL )
+    #endif /* configENABLE_MPU */
+
+
+/* MPU regions. */
+    #define portPRIVILEGED_FLASH_REGION                   ( 0UL )
+    #define portUNPRIVILEGED_FLASH_REGION                 ( 1UL )
+    #define portUNPRIVILEGED_SYSCALLS_REGION              ( 2UL )
+    #define portPRIVILEGED_RAM_REGION                     ( 3UL )
+    #define portSTACK_REGION                              ( 4UL )
+    #define portFIRST_CONFIGURABLE_REGION                 ( 5UL )
+    #define portLAST_CONFIGURABLE_REGION                  ( 7UL )
+    #define portNUM_CONFIGURABLE_REGIONS                  ( ( portLAST_CONFIGURABLE_REGION - portFIRST_CONFIGURABLE_REGION ) + 1 )
+    #define portTOTAL_NUM_REGIONS                         ( portNUM_CONFIGURABLE_REGIONS + 1 )   /* Plus one to make space for the stack region. */
+
+/* Device memory attributes used in MPU_MAIR registers.
+ *
+ * 8-bit values encoded as follows:
+ *  Bit[7:4] - 0000 - Device Memory
+ *  Bit[3:2] - 00 --> Device-nGnRnE
+ *				01 --> Device-nGnRE
+ *				10 --> Device-nGRE
+ *				11 --> Device-GRE
+ *  Bit[1:0] - 00, Reserved.
+ */
+    #define portMPU_DEVICE_MEMORY_nGnRnE                  ( 0x00 )   /* 0000 0000 */
+    #define portMPU_DEVICE_MEMORY_nGnRE                   ( 0x04 )   /* 0000 0100 */
+    #define portMPU_DEVICE_MEMORY_nGRE                    ( 0x08 )   /* 0000 1000 */
+    #define portMPU_DEVICE_MEMORY_GRE                     ( 0x0C )   /* 0000 1100 */
+
+/* Normal memory attributes used in MPU_MAIR registers. */
+    #define portMPU_NORMAL_MEMORY_NON_CACHEABLE           ( 0x44 )   /* Non-cacheable. */
+    #define portMPU_NORMAL_MEMORY_BUFFERABLE_CACHEABLE    ( 0xFF )   /* Non-Transient, Write-back, Read-Allocate and Write-Allocate. */
+
+/* Attributes used in MPU_RBAR registers. */
+    #define portMPU_REGION_NON_SHAREABLE                  ( 0UL << 3UL )
+    #define portMPU_REGION_INNER_SHAREABLE                ( 1UL << 3UL )
+    #define portMPU_REGION_OUTER_SHAREABLE                ( 2UL << 3UL )
+
+    #define portMPU_REGION_PRIVILEGED_READ_WRITE          ( 0UL << 1UL )
+    #define portMPU_REGION_READ_WRITE                     ( 1UL << 1UL )
+    #define portMPU_REGION_PRIVILEGED_READ_ONLY           ( 2UL << 1UL )
+    #define portMPU_REGION_READ_ONLY                      ( 3UL << 1UL )
+
+    #define portMPU_REGION_EXECUTE_NEVER                  ( 1UL )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Settings to define an MPU region.
+ */
+    typedef struct MPURegionSettings
+    {
+        uint32_t ulRBAR; /**< RBAR for the region. */
+        uint32_t ulRLAR; /**< RLAR for the region. */
+    } MPURegionSettings_t;
+
+/**
+ * @brief MPU settings as stored in the TCB.
+ */
+    typedef struct MPU_SETTINGS
+    {
+        uint32_t ulMAIR0;                                              /**< MAIR0 for the task containing attributes for all the 4 per task regions. */
+        MPURegionSettings_t xRegionsSettings[ portTOTAL_NUM_REGIONS ]; /**< Settings for 4 per task regions. */
+    } xMPU_SETTINGS;
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief SVC numbers.
+ */
+    #define portSVC_ALLOCATE_SECURE_CONTEXT    0
+    #define portSVC_FREE_SECURE_CONTEXT        1
+    #define portSVC_START_SCHEDULER            2
+    #define portSVC_RAISE_PRIVILEGE            3
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Scheduler utilities.
+ */
+    #define portYIELD()                                 vPortYield()
+    #define portNVIC_INT_CTRL_REG     ( *( ( volatile uint32_t * ) 0xe000ed04 ) )
+    #define portNVIC_PENDSVSET_BIT    ( 1UL << 28UL )
+    #define portEND_SWITCHING_ISR( xSwitchRequired )    do { if( xSwitchRequired ) portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT; } while( 0 )
+    #define portYIELD_FROM_ISR( x )                     portEND_SWITCHING_ISR( x )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Tickless idle/low power functionality.
+ */
+    #ifndef portSUPPRESS_TICKS_AND_SLEEP
+        extern void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime );
+        #define portSUPPRESS_TICKS_AND_SLEEP( xExpectedIdleTime )    vPortSuppressTicksAndSleep( xExpectedIdleTime )
+    #endif
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Critical section management.
+ */
+    #define portSET_INTERRUPT_MASK_FROM_ISR()         ulSetInterruptMask()
+    #define portCLEAR_INTERRUPT_MASK_FROM_ISR( x )    vClearInterruptMask( x )
+    #define portDISABLE_INTERRUPTS()                  __asm volatile ( " cpsid i " ::: "memory" )
+    #define portENABLE_INTERRUPTS()                   __asm volatile ( " cpsie i " ::: "memory" )
+    #define portENTER_CRITICAL()                      vPortEnterCritical()
+    #define portEXIT_CRITICAL()                       vPortExitCritical()
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Task function macros as described on the FreeRTOS.org WEB site.
+ */
+    #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
+    #define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )
+/*-----------------------------------------------------------*/
+
+    #if ( configENABLE_TRUSTZONE == 1 )
+
+/**
+ * @brief Allocate a secure context for the task.
+ *
+ * Tasks are not created with a secure context. Any task that is going to call
+ * secure functions must call portALLOCATE_SECURE_CONTEXT() to allocate itself a
+ * secure context before it calls any secure function.
+ *
+ * @param[in] ulSecureStackSize The size of the secure stack to be allocated.
+ */
+        #define portALLOCATE_SECURE_CONTEXT( ulSecureStackSize )    vPortAllocateSecureContext( ulSecureStackSize )
+
+/**
+ * @brief Called when a task is deleted to delete the task's secure context,
+ * if it has one.
+ *
+ * @param[in] pxTCB The TCB of the task being deleted.
+ */
+        #define portCLEAN_UP_TCB( pxTCB )                           vPortFreeSecureContext( ( uint32_t * ) pxTCB )
+    #endif /* configENABLE_TRUSTZONE */
+/*-----------------------------------------------------------*/
+
+    #if ( configENABLE_MPU == 1 )
+
+/**
+ * @brief Checks whether or not the processor is privileged.
+ *
+ * @return 1 if the processor is already privileged, 0 otherwise.
+ */
+        #define portIS_PRIVILEGED()      xIsPrivileged()
+
+/**
+ * @brief Raise an SVC request to raise privilege.
+ *
+ * The SVC handler checks that the SVC was raised from a system call and only
+ * then it raises the privilege. If this is called from any other place,
+ * the privilege is not raised.
+ */
+        #define portRAISE_PRIVILEGE()    __asm volatile ( "svc %0 \n" ::"i" ( portSVC_RAISE_PRIVILEGE ) : "memory" );
+
+/**
+ * @brief Lowers the privilege level by setting the bit 0 of the CONTROL
+ * register.
+ */
+        #define portRESET_PRIVILEGE()    vResetPrivilege()
+    #else
+        #define portIS_PRIVILEGED()
+        #define portRAISE_PRIVILEGE()
+        #define portRESET_PRIVILEGE()
+    #endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Barriers.
+ */
+    #define portMEMORY_BARRIER()    __asm volatile ( "" ::: "memory" )
+/*-----------------------------------------------------------*/
+
+/* Suppress warnings that are generated by the IAR tools, but cannot be fixed in
+ * the source code because to do so would cause other compilers to generate
+ * warnings. */
+    #pragma diag_suppress=Be006
+    #pragma diag_suppress=Pa082
+/*-----------------------------------------------------------*/
+
+    #ifdef __cplusplus
+        }
+    #endif
+
+#endif /* PORTMACRO_H */

freertos/Source/portable/ARMv8M/non_secure/portable/IAR/ARM_CM23_NTZ/portasm.s

@@ -0,0 +1,310 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+/* Including FreeRTOSConfig.h here will cause build errors if the header file
+contains code not understood by the assembler - for example the 'extern' keyword.
+To avoid errors place any such code inside a #ifdef __ICCARM__/#endif block so
+the code is included in C files but excluded by the preprocessor in assembly
+files (__ICCARM__ is defined by the IAR C compiler but not by the IAR assembler. */
+#include "FreeRTOSConfig.h"
+
+	EXTERN pxCurrentTCB
+	EXTERN vTaskSwitchContext
+	EXTERN vPortSVCHandler_C
+
+	PUBLIC xIsPrivileged
+	PUBLIC vResetPrivilege
+	PUBLIC vRestoreContextOfFirstTask
+	PUBLIC vRaisePrivilege
+	PUBLIC vStartFirstTask
+	PUBLIC ulSetInterruptMask
+	PUBLIC vClearInterruptMask
+	PUBLIC PendSV_Handler
+	PUBLIC SVC_Handler
+
+#if ( configENABLE_FPU == 1 )
+	#error Cortex-M23 does not have a Floating Point Unit (FPU) and therefore configENABLE_FPU must be set to 0.
+#endif
+/*-----------------------------------------------------------*/
+
+/*---------------- Unprivileged Functions -------------------*/
+
+/*-----------------------------------------------------------*/
+
+	SECTION .text:CODE:NOROOT(2)
+	THUMB
+/*-----------------------------------------------------------*/
+
+xIsPrivileged:
+	mrs r0, control							/* r0 = CONTROL. */
+	movs r1, #1								/* r1 = 1. */
+	tst r0, r1								/* Perform r0 & r1 (bitwise AND) and update the conditions flag. */
+	beq running_privileged					/* If the result of previous AND operation was 0, branch. */
+	movs r0, #0								/* CONTROL[0]!=0. Return false to indicate that the processor is not privileged. */
+	bx lr									/* Return. */
+	running_privileged:
+		movs r0, #1							/* CONTROL[0]==0. Return true to indicate that the processor is privileged. */
+		bx lr								/* Return. */
+
+/*-----------------------------------------------------------*/
+
+vResetPrivilege:
+	mrs r0, control							/* r0 = CONTROL. */
+	movs r1, #1								/* r1 = 1. */
+	orrs r0, r1								/* r0 = r0 | r1. */
+	msr control, r0							/* CONTROL = r0. */
+	bx lr									/* Return to the caller. */
+/*-----------------------------------------------------------*/
+
+/*----------------- Privileged Functions --------------------*/
+
+/*-----------------------------------------------------------*/
+
+	SECTION privileged_functions:CODE:NOROOT(2)
+	THUMB
+/*-----------------------------------------------------------*/
+
+vRestoreContextOfFirstTask:
+	ldr  r2, =pxCurrentTCB					/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+	ldr  r1, [r2]							/* Read pxCurrentTCB. */
+	ldr  r0, [r1]							/* Read top of stack from TCB - The first item in pxCurrentTCB is the task top of stack. */
+
+#if ( configENABLE_MPU == 1 )
+	dmb										/* Complete outstanding transfers before disabling MPU. */
+	ldr r2, =0xe000ed94						/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+	ldr r3, [r2]							/* Read the value of MPU_CTRL. */
+	movs r4, #1								/* r4 = 1. */
+	bics r3, r4								/* r3 = r3 & ~r4 i.e. Clear the bit 0 in r3. */
+	str r3, [r2]							/* Disable MPU. */
+
+	adds r1, #4								/* r1 = r1 + 4. r1 now points to MAIR0 in TCB. */
+	ldr  r4, [r1]							/* r4 = *r1 i.e. r4 = MAIR0. */
+	ldr  r2, =0xe000edc0					/* r2 = 0xe000edc0 [Location of MAIR0]. */
+	str  r4, [r2]							/* Program MAIR0. */
+	ldr  r2, =0xe000ed98					/* r2 = 0xe000ed98 [Location of RNR]. */
+	adds r1, #4								/* r1 = r1 + 4. r1 now points to first RBAR in TCB. */
+	movs r4, #4								/* r4 = 4. */
+	str  r4, [r2]							/* Program RNR = 4. */
+	ldmia r1!, {r5,r6}						/* Read first set of RBAR/RLAR from TCB. */
+	ldr  r3, =0xe000ed9c					/* r3 = 0xe000ed9c [Location of RBAR]. */
+	stmia r3!, {r5,r6}						/* Write first set of RBAR/RLAR registers. */
+	movs r4, #5								/* r4 = 5. */
+	str  r4, [r2]							/* Program RNR = 5. */
+	ldmia r1!, {r5,r6}						/* Read second set of RBAR/RLAR from TCB. */
+	ldr  r3, =0xe000ed9c					/* r3 = 0xe000ed9c [Location of RBAR]. */
+	stmia r3!, {r5,r6}						/* Write second set of RBAR/RLAR registers. */
+	movs r4, #6								/* r4 = 6. */
+	str  r4, [r2]							/* Program RNR = 6. */
+	ldmia r1!, {r5,r6}						/* Read third set of RBAR/RLAR from TCB. */
+	ldr  r3, =0xe000ed9c					/* r3 = 0xe000ed9c [Location of RBAR]. */
+	stmia r3!, {r5,r6}						/* Write third set of RBAR/RLAR registers. */
+	movs r4, #7								/* r4 = 7. */
+	str  r4, [r2]							/* Program RNR = 7. */
+	ldmia r1!, {r5,r6}						/* Read fourth set of RBAR/RLAR from TCB. */
+	ldr  r3, =0xe000ed9c					/* r3 = 0xe000ed9c [Location of RBAR]. */
+	stmia r3!, {r5,r6}						/* Write fourth set of RBAR/RLAR registers. */
+
+	ldr r2, =0xe000ed94						/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+	ldr r3, [r2]							/* Read the value of MPU_CTRL. */
+	movs r4, #1								/* r4 = 1. */
+	orrs r3, r4								/* r3 = r3 | r4 i.e. Set the bit 0 in r3. */
+	str r3, [r2]							/* Enable MPU. */
+	dsb										/* Force memory writes before continuing. */
+#endif /* configENABLE_MPU */
+
+#if ( configENABLE_MPU == 1 )
+	ldm  r0!, {r1-r3}						/* Read from stack - r1 = PSPLIM, r2 = CONTROL and r3 = EXC_RETURN. */
+	msr  psplim, r1							/* Set this task's PSPLIM value. */
+	msr  control, r2						/* Set this task's CONTROL value. */
+	adds r0, #32							/* Discard everything up to r0. */
+	msr  psp, r0							/* This is now the new top of stack to use in the task. */
+	isb
+	bx   r3									/* Finally, branch to EXC_RETURN. */
+#else /* configENABLE_MPU */
+	ldm  r0!, {r1-r2}						/* Read from stack - r1 = PSPLIM and r2 = EXC_RETURN. */
+	msr  psplim, r1							/* Set this task's PSPLIM value. */
+	movs r1, #2								/* r1 = 2. */
+	msr  CONTROL, r1						/* Switch to use PSP in the thread mode. */
+	adds r0, #32							/* Discard everything up to r0. */
+	msr  psp, r0							/* This is now the new top of stack to use in the task. */
+	isb
+	bx   r2									/* Finally, branch to EXC_RETURN. */
+#endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+vRaisePrivilege:
+	mrs  r0, control						/* Read the CONTROL register. */
+	movs r1, #1								/* r1 = 1. */
+	bics r0, r1								/* Clear the bit 0. */
+	msr  control, r0						/* Write back the new CONTROL value. */
+	bx lr									/* Return to the caller. */
+/*-----------------------------------------------------------*/
+
+vStartFirstTask:
+	ldr r0, =0xe000ed08						/* Use the NVIC offset register to locate the stack. */
+	ldr r0, [r0]							/* Read the VTOR register which gives the address of vector table. */
+	ldr r0, [r0]							/* The first entry in vector table is stack pointer. */
+	msr msp, r0								/* Set the MSP back to the start of the stack. */
+	cpsie i									/* Globally enable interrupts. */
+	dsb
+	isb
+	svc 2									/* System call to start the first task. portSVC_START_SCHEDULER = 2. */
+	nop
+/*-----------------------------------------------------------*/
+
+ulSetInterruptMask:
+	mrs r0, PRIMASK
+	cpsid i
+	bx lr
+/*-----------------------------------------------------------*/
+
+vClearInterruptMask:
+	msr PRIMASK, r0
+	bx lr
+/*-----------------------------------------------------------*/
+
+PendSV_Handler:
+	mrs r0, psp								/* Read PSP in r0. */
+	ldr r2, =pxCurrentTCB					/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+	ldr r1, [r2]							/* Read pxCurrentTCB. */
+#if ( configENABLE_MPU == 1 )
+	subs r0, r0, #44						/* Make space for PSPLIM, CONTROL, LR and the remaining registers on the stack. */
+	str r0, [r1]							/* Save the new top of stack in TCB. */
+	mrs r1, psplim							/* r1 = PSPLIM. */
+	mrs r2, control							/* r2 = CONTROL. */
+	mov r3, lr								/* r3 = LR/EXC_RETURN. */
+	stmia r0!, {r1-r7}						/* Store on the stack - PSPLIM, CONTROL, LR and low registers that are not automatically saved. */
+	mov r4, r8								/* r4 = r8. */
+	mov r5, r9								/* r5 = r9. */
+	mov r6, r10								/* r6 = r10. */
+	mov r7, r11								/* r7 = r11. */
+	stmia r0!, {r4-r7}						/* Store the high registers that are not saved automatically. */
+#else /* configENABLE_MPU */
+	subs r0, r0, #40						/* Make space for PSPLIM, LR and the remaining registers on the stack. */
+	str r0, [r1]							/* Save the new top of stack in TCB. */
+	mrs r2, psplim							/* r2 = PSPLIM. */
+	mov r3, lr								/* r3 = LR/EXC_RETURN. */
+	stmia r0!, {r2-r7}						/* Store on the stack - PSPLIM, LR and low registers that are not automatically saved. */
+	mov r4, r8								/* r4 = r8. */
+	mov r5, r9								/* r5 = r9. */
+	mov r6, r10								/* r6 = r10. */
+	mov r7, r11								/* r7 = r11. */
+	stmia r0!, {r4-r7}						/* Store the high registers that are not saved automatically. */
+#endif /* configENABLE_MPU */
+
+	cpsid i
+	bl vTaskSwitchContext
+	cpsie i
+
+	ldr r2, =pxCurrentTCB					/* Read the location of pxCurrentTCB i.e. &( pxCurrentTCB ). */
+	ldr r1, [r2]							/* Read pxCurrentTCB. */
+	ldr r0, [r1]							/* The first item in pxCurrentTCB is the task top of stack. r0 now points to the top of stack. */
+
+#if ( configENABLE_MPU == 1 )
+	dmb										/* Complete outstanding transfers before disabling MPU. */
+	ldr r2, =0xe000ed94						/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+	ldr r3, [r2]							/* Read the value of MPU_CTRL. */
+	movs r4, #1								/* r4 = 1. */
+	bics r3, r4								/* r3 = r3 & ~r4 i.e. Clear the bit 0 in r3. */
+	str r3, [r2]							/* Disable MPU. */
+
+	adds r1, #4								/* r1 = r1 + 4. r1 now points to MAIR0 in TCB. */
+	ldr  r4, [r1]							/* r4 = *r1 i.e. r4 = MAIR0. */
+	ldr  r2, =0xe000edc0					/* r2 = 0xe000edc0 [Location of MAIR0]. */
+	str  r4, [r2]							/* Program MAIR0. */
+	ldr  r2, =0xe000ed98					/* r2 = 0xe000ed98 [Location of RNR]. */
+	adds r1, #4								/* r1 = r1 + 4. r1 now points to first RBAR in TCB. */
+	movs r4, #4								/* r4 = 4. */
+	str  r4, [r2]							/* Program RNR = 4. */
+	ldmia r1!, {r5,r6}						/* Read first set of RBAR/RLAR from TCB. */
+	ldr  r3, =0xe000ed9c					/* r3 = 0xe000ed9c [Location of RBAR]. */
+	stmia r3!, {r5,r6}						/* Write first set of RBAR/RLAR registers. */
+	movs r4, #5								/* r4 = 5. */
+	str  r4, [r2]							/* Program RNR = 5. */
+	ldmia r1!, {r5,r6}						/* Read second set of RBAR/RLAR from TCB. */
+	ldr  r3, =0xe000ed9c					/* r3 = 0xe000ed9c [Location of RBAR]. */
+	stmia r3!, {r5,r6}						/* Write second set of RBAR/RLAR registers. */
+	movs r4, #6								/* r4 = 6. */
+	str  r4, [r2]							/* Program RNR = 6. */
+	ldmia r1!, {r5,r6}						/* Read third set of RBAR/RLAR from TCB. */
+	ldr  r3, =0xe000ed9c					/* r3 = 0xe000ed9c [Location of RBAR]. */
+	stmia r3!, {r5,r6}						/* Write third set of RBAR/RLAR registers. */
+	movs r4, #7								/* r4 = 7. */
+	str  r4, [r2]							/* Program RNR = 7. */
+	ldmia r1!, {r5,r6}						/* Read fourth set of RBAR/RLAR from TCB. */
+	ldr  r3, =0xe000ed9c					/* r3 = 0xe000ed9c [Location of RBAR]. */
+	stmia r3!, {r5,r6}						/* Write fourth set of RBAR/RLAR registers. */
+
+	ldr r2, =0xe000ed94						/* r2 = 0xe000ed94 [Location of MPU_CTRL]. */
+	ldr r3, [r2]							/* Read the value of MPU_CTRL. */
+	movs r4, #1								/* r4 = 1. */
+	orrs r3, r4								/* r3 = r3 | r4 i.e. Set the bit 0 in r3. */
+	str r3, [r2]							/* Enable MPU. */
+	dsb										/* Force memory writes before continuing. */
+#endif /* configENABLE_MPU */
+
+#if ( configENABLE_MPU == 1 )
+	adds r0, r0, #28						/* Move to the high registers. */
+	ldmia r0!, {r4-r7}						/* Restore the high registers that are not automatically restored. */
+	mov r8, r4								/* r8 = r4. */
+	mov r9, r5								/* r9 = r5. */
+	mov r10, r6								/* r10 = r6. */
+	mov r11, r7								/* r11 = r7. */
+	msr psp, r0								/* Remember the new top of stack for the task. */
+	subs r0, r0, #44						/* Move to the starting of the saved context. */
+	ldmia r0!, {r1-r7}						/* Read from stack - r1 = PSPLIM, r2 = CONTROL, r3 = LR and r4-r7 restored. */
+	msr psplim, r1							/* Restore the PSPLIM register value for the task. */
+	msr control, r2							/* Restore the CONTROL register value for the task. */
+	bx r3
+#else /* configENABLE_MPU */
+	adds r0, r0, #24						/* Move to the high registers. */
+	ldmia r0!, {r4-r7}						/* Restore the high registers that are not automatically restored. */
+	mov r8, r4								/* r8 = r4. */
+	mov r9, r5								/* r9 = r5. */
+	mov r10, r6								/* r10 = r6. */
+	mov r11, r7								/* r11 = r7. */
+	msr psp, r0								/* Remember the new top of stack for the task. */
+	subs r0, r0, #40						/* Move to the starting of the saved context. */
+	ldmia r0!, {r2-r7}						/* Read from stack - r2 = PSPLIM, r3 = LR and r4-r7 restored. */
+	msr psplim, r2							/* Restore the PSPLIM register value for the task. */
+	bx r3
+#endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+SVC_Handler:
+	movs r0, #4
+	mov r1, lr
+	tst r0, r1
+	beq stacking_used_msp
+	mrs r0, psp
+	b vPortSVCHandler_C
+	stacking_used_msp:
+		mrs r0, msp
+		b vPortSVCHandler_C
+/*-----------------------------------------------------------*/
+
+	END

freertos/Source/portable/ARMv8M/non_secure/portable/IAR/ARM_CM23_NTZ/portmacro.h

@@ -0,0 +1,317 @@
+/*
+ * FreeRTOS Kernel V10.4.6
+ * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * https://www.FreeRTOS.org
+ * https://github.com/FreeRTOS
+ *
+ */
+
+#ifndef PORTMACRO_H
+    #define PORTMACRO_H
+
+    #ifdef __cplusplus
+        extern "C" {
+    #endif
+
+/*------------------------------------------------------------------------------
+ * Port specific definitions.
+ *
+ * The settings in this file configure FreeRTOS correctly for the given hardware
+ * and compiler.
+ *
+ * These settings should not be altered.
+ *------------------------------------------------------------------------------
+ */
+
+    #ifndef configENABLE_FPU
+        #error configENABLE_FPU must be defined in FreeRTOSConfig.h.  Set configENABLE_FPU to 1 to enable the FPU or 0 to disable the FPU.
+    #endif /* configENABLE_FPU */
+
+    #ifndef configENABLE_MPU
+        #error configENABLE_MPU must be defined in FreeRTOSConfig.h.  Set configENABLE_MPU to 1 to enable the MPU or 0 to disable the MPU.
+    #endif /* configENABLE_MPU */
+
+    #ifndef configENABLE_TRUSTZONE
+        #error configENABLE_TRUSTZONE must be defined in FreeRTOSConfig.h.  Set configENABLE_TRUSTZONE to 1 to enable TrustZone or 0 to disable TrustZone.
+    #endif /* configENABLE_TRUSTZONE */
+
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Type definitions.
+ */
+    #define portCHAR          char
+    #define portFLOAT         float
+    #define portDOUBLE        double
+    #define portLONG          long
+    #define portSHORT         short
+    #define portSTACK_TYPE    uint32_t
+    #define portBASE_TYPE     long
+
+    typedef portSTACK_TYPE   StackType_t;
+    typedef long             BaseType_t;
+    typedef unsigned long    UBaseType_t;
+
+    #if ( configUSE_16_BIT_TICKS == 1 )
+        typedef uint16_t     TickType_t;
+        #define portMAX_DELAY              ( TickType_t ) 0xffff
+    #else
+        typedef uint32_t     TickType_t;
+        #define portMAX_DELAY              ( TickType_t ) 0xffffffffUL
+
+/* 32-bit tick type on a 32-bit architecture, so reads of the tick count do
+ * not need to be guarded with a critical section. */
+        #define portTICK_TYPE_IS_ATOMIC    1
+    #endif
+/*-----------------------------------------------------------*/
+
+/**
+ * Architecture specifics.
+ */
+    #define portARCH_NAME                      "Cortex-M23"
+    #define portSTACK_GROWTH                   ( -1 )
+    #define portTICK_PERIOD_MS                 ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
+    #define portBYTE_ALIGNMENT                 8
+    #define portNOP()
+    #define portINLINE                         __inline
+    #ifndef portFORCE_INLINE
+        #define portFORCE_INLINE               inline __attribute__( ( always_inline ) )
+    #endif
+    #define portHAS_STACK_OVERFLOW_CHECKING    1
+    #define portDONT_DISCARD                   __root
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Extern declarations.
+ */
+    extern BaseType_t xPortIsInsideInterrupt( void );
+
+    extern void vPortYield( void ) /* PRIVILEGED_FUNCTION */;
+
+    extern void vPortEnterCritical( void ) /* PRIVILEGED_FUNCTION */;
+    extern void vPortExitCritical( void ) /* PRIVILEGED_FUNCTION */;
+
+    extern uint32_t ulSetInterruptMask( void ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */;
+    extern void vClearInterruptMask( uint32_t ulMask ) /* __attribute__(( naked )) PRIVILEGED_FUNCTION */;
+
+    #if ( configENABLE_TRUSTZONE == 1 )
+        extern void vPortAllocateSecureContext( uint32_t ulSecureStackSize ); /* __attribute__ (( naked )) */
+        extern void vPortFreeSecureContext( uint32_t * pulTCB ) /* __attribute__ (( naked )) PRIVILEGED_FUNCTION */;
+    #endif /* configENABLE_TRUSTZONE */
+
+    #if ( configENABLE_MPU == 1 )
+        extern BaseType_t xIsPrivileged( void ) /* __attribute__ (( naked )) */;
+        extern void vResetPrivilege( void ) /* __attribute__ (( naked )) */;
+    #endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief MPU specific constants.
+ */
+    #if ( configENABLE_MPU == 1 )
+        #define portUSING_MPU_WRAPPERS    1
+        #define portPRIVILEGE_BIT         ( 0x80000000UL )
+    #else
+        #define portPRIVILEGE_BIT         ( 0x0UL )
+    #endif /* configENABLE_MPU */
+
+
+/* MPU regions. */
+    #define portPRIVILEGED_FLASH_REGION                   ( 0UL )
+    #define portUNPRIVILEGED_FLASH_REGION                 ( 1UL )
+    #define portUNPRIVILEGED_SYSCALLS_REGION              ( 2UL )
+    #define portPRIVILEGED_RAM_REGION                     ( 3UL )
+    #define portSTACK_REGION                              ( 4UL )
+    #define portFIRST_CONFIGURABLE_REGION                 ( 5UL )
+    #define portLAST_CONFIGURABLE_REGION                  ( 7UL )
+    #define portNUM_CONFIGURABLE_REGIONS                  ( ( portLAST_CONFIGURABLE_REGION - portFIRST_CONFIGURABLE_REGION ) + 1 )
+    #define portTOTAL_NUM_REGIONS                         ( portNUM_CONFIGURABLE_REGIONS + 1 )   /* Plus one to make space for the stack region. */
+
+/* Device memory attributes used in MPU_MAIR registers.
+ *
+ * 8-bit values encoded as follows:
+ *  Bit[7:4] - 0000 - Device Memory
+ *  Bit[3:2] - 00 --> Device-nGnRnE
+ *				01 --> Device-nGnRE
+ *				10 --> Device-nGRE
+ *				11 --> Device-GRE
+ *  Bit[1:0] - 00, Reserved.
+ */
+    #define portMPU_DEVICE_MEMORY_nGnRnE                  ( 0x00 )   /* 0000 0000 */
+    #define portMPU_DEVICE_MEMORY_nGnRE                   ( 0x04 )   /* 0000 0100 */
+    #define portMPU_DEVICE_MEMORY_nGRE                    ( 0x08 )   /* 0000 1000 */
+    #define portMPU_DEVICE_MEMORY_GRE                     ( 0x0C )   /* 0000 1100 */
+
+/* Normal memory attributes used in MPU_MAIR registers. */
+    #define portMPU_NORMAL_MEMORY_NON_CACHEABLE           ( 0x44 )   /* Non-cacheable. */
+    #define portMPU_NORMAL_MEMORY_BUFFERABLE_CACHEABLE    ( 0xFF )   /* Non-Transient, Write-back, Read-Allocate and Write-Allocate. */
+
+/* Attributes used in MPU_RBAR registers. */
+    #define portMPU_REGION_NON_SHAREABLE                  ( 0UL << 3UL )
+    #define portMPU_REGION_INNER_SHAREABLE                ( 1UL << 3UL )
+    #define portMPU_REGION_OUTER_SHAREABLE                ( 2UL << 3UL )
+
+    #define portMPU_REGION_PRIVILEGED_READ_WRITE          ( 0UL << 1UL )
+    #define portMPU_REGION_READ_WRITE                     ( 1UL << 1UL )
+    #define portMPU_REGION_PRIVILEGED_READ_ONLY           ( 2UL << 1UL )
+    #define portMPU_REGION_READ_ONLY                      ( 3UL << 1UL )
+
+    #define portMPU_REGION_EXECUTE_NEVER                  ( 1UL )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Settings to define an MPU region.
+ */
+    typedef struct MPURegionSettings
+    {
+        uint32_t ulRBAR; /**< RBAR for the region. */
+        uint32_t ulRLAR; /**< RLAR for the region. */
+    } MPURegionSettings_t;
+
+/**
+ * @brief MPU settings as stored in the TCB.
+ */
+    typedef struct MPU_SETTINGS
+    {
+        uint32_t ulMAIR0;                                              /**< MAIR0 for the task containing attributes for all the 4 per task regions. */
+        MPURegionSettings_t xRegionsSettings[ portTOTAL_NUM_REGIONS ]; /**< Settings for 4 per task regions. */
+    } xMPU_SETTINGS;
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief SVC numbers.
+ */
+    #define portSVC_ALLOCATE_SECURE_CONTEXT    0
+    #define portSVC_FREE_SECURE_CONTEXT        1
+    #define portSVC_START_SCHEDULER            2
+    #define portSVC_RAISE_PRIVILEGE            3
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Scheduler utilities.
+ */
+    #define portYIELD()                                 vPortYield()
+    #define portNVIC_INT_CTRL_REG     ( *( ( volatile uint32_t * ) 0xe000ed04 ) )
+    #define portNVIC_PENDSVSET_BIT    ( 1UL << 28UL )
+    #define portEND_SWITCHING_ISR( xSwitchRequired )    do { if( xSwitchRequired ) portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT; } while( 0 )
+    #define portYIELD_FROM_ISR( x )                     portEND_SWITCHING_ISR( x )
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Critical section management.
+ */
+    #define portSET_INTERRUPT_MASK_FROM_ISR()         ulSetInterruptMask()
+    #define portCLEAR_INTERRUPT_MASK_FROM_ISR( x )    vClearInterruptMask( x )
+    #define portDISABLE_INTERRUPTS()                  __asm volatile ( " cpsid i " ::: "memory" )
+    #define portENABLE_INTERRUPTS()                   __asm volatile ( " cpsie i " ::: "memory" )
+    #define portENTER_CRITICAL()                      vPortEnterCritical()
+    #define portEXIT_CRITICAL()                       vPortExitCritical()
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Tickless idle/low power functionality.
+ */
+    #ifndef portSUPPRESS_TICKS_AND_SLEEP
+        extern void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime );
+        #define portSUPPRESS_TICKS_AND_SLEEP( xExpectedIdleTime )    vPortSuppressTicksAndSleep( xExpectedIdleTime )
+    #endif
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Task function macros as described on the FreeRTOS.org WEB site.
+ */
+    #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
+    #define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )
+/*-----------------------------------------------------------*/
+
+    #if ( configENABLE_TRUSTZONE == 1 )
+
+/**
+ * @brief Allocate a secure context for the task.
+ *
+ * Tasks are not created with a secure context. Any task that is going to call
+ * secure functions must call portALLOCATE_SECURE_CONTEXT() to allocate itself a
+ * secure context before it calls any secure function.
+ *
+ * @param[in] ulSecureStackSize The size of the secure stack to be allocated.
+ */
+        #define portALLOCATE_SECURE_CONTEXT( ulSecureStackSize )    vPortAllocateSecureContext( ulSecureStackSize )
+
+/**
+ * @brief Called when a task is deleted to delete the task's secure context,
+ * if it has one.
+ *
+ * @param[in] pxTCB The TCB of the task being deleted.
+ */
+        #define portCLEAN_UP_TCB( pxTCB )                           vPortFreeSecureContext( ( uint32_t * ) pxTCB )
+    #endif /* configENABLE_TRUSTZONE */
+/*-----------------------------------------------------------*/
+
+    #if ( configENABLE_MPU == 1 )
+
+/**
+ * @brief Checks whether or not the processor is privileged.
+ *
+ * @return 1 if the processor is already privileged, 0 otherwise.
+ */
+        #define portIS_PRIVILEGED()      xIsPrivileged()
+
+/**
+ * @brief Raise an SVC request to raise privilege.
+ *
+ * The SVC handler checks that the SVC was raised from a system call and only
+ * then it raises the privilege. If this is called from any other place,
+ * the privilege is not raised.
+ */
+        #define portRAISE_PRIVILEGE()    __asm volatile ( "svc %0 \n" ::"i" ( portSVC_RAISE_PRIVILEGE ) : "memory" );
+
+/**
+ * @brief Lowers the privilege level by setting the bit 0 of the CONTROL
+ * register.
+ */
+        #define portRESET_PRIVILEGE()    vResetPrivilege()
+    #else
+        #define portIS_PRIVILEGED()
+        #define portRAISE_PRIVILEGE()
+        #define portRESET_PRIVILEGE()
+    #endif /* configENABLE_MPU */
+/*-----------------------------------------------------------*/
+
+/**
+ * @brief Barriers.
+ */
+    #define portMEMORY_BARRIER()    __asm volatile ( "" ::: "memory" )
+/*-----------------------------------------------------------*/
+
+/* Suppress warnings that are generated by the IAR tools, but cannot be fixed in
+ * the source code because to do so would cause other compilers to generate
+ * warnings. */
+    #pragma diag_suppress=Be006
+    #pragma diag_suppress=Pa082
+/*-----------------------------------------------------------*/
+
+    #ifdef __cplusplus
+        }
+    #endif
+
+#endif /* PORTMACRO_H */