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Gaurav Aggarwal bba322a72b Add support for dynamically allocated stack 
If xTaskCreate API is used to create a task, the task's stack is
allocated using pvPortMalloc. This places the task's stack in the
privileged data section (as all the heap memory is now placed in the
privileged data section).

We had a separate MPU region to grant a task access to its stack - If
the stack is in the privileged data section, this results in
overlapping MPU regions as privileged data section is already protected
using a separate MPU region. ARMv8-M does not allow overlapping MPU
regions and this results in a fault. This commit ensures to not use a
separate MPU region to protect the task's stack if it lies within the
privileged data section.

A side effect of this is that xTaskCreate API cannot be used to create
an unprivileged task as the task's stack will be in the privileged data
section and the task won't have access to it. xTaskCreateRestricted and
xTaskCreateRestrictedStatic API should be used to create unprivileged
tasks.

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
2020-07-04 15:43:58 -07:00
.github Create pull_request_template.md 2020-03-17 13:11:11 -07:00
include Update mpu_wrappers with task notification changes (#79) 2020-06-26 09:35:28 -07:00
portable Add support for dynamically allocated stack 2020-07-04 15:43:58 -07:00
CONTRIBUTING.md Added CONTRIBUTING (#18) 2020-02-25 16:22:57 -08:00
croutine.c Updates vCoRoutineSchedule() so it returns without doing anything if if the co-routine internal data structures have not been initialised. The internal data structures are initialised when the first co-routine is created. 2020-02-26 10:45:32 -08:00
event_groups.c version bump to v10.3.1 (#16) 2020-02-18 22:03:54 -08:00
GitHub-FreeRTOS-Kernel-Home.url Adding url to direct users to FreeRTOS-Kernel github page. (#32) 2020-03-17 19:30:19 -07:00
History.txt Updated History.txt for task notification array change (#65) 2020-05-28 09:55:17 -07:00
LICENSE.md Bring license in sync with FreeRTOS/FreeRTOS. (#20) 2020-02-27 14:33:46 -08:00
list.c Place privileged symbols correctly 2020-07-03 15:09:23 -07:00
queue.c Improvement to O.F. protections (#75) 2020-06-30 11:03:30 -07:00
Quick_Start_Guide.url Add quick start guide. 2013-04-30 19:37:00 +00:00
README.md Replacing readme.txt with README.md. (#11) 2020-02-16 13:18:58 -08:00
SECURITY.md Create SECURITY.md 2020-03-17 13:08:50 -07:00
stream_buffer.c version bump to v10.3.1 (#16) 2020-02-18 22:03:54 -08:00
tasks.c Place privileged symbols correctly 2020-07-03 15:09:23 -07:00
timers.c Place privileged symbols correctly 2020-07-03 15:09:23 -07:00

README.md

Getting started

This repository contains FreeRTOS kernel source/header files and kernel ports only. This repository is referenced as a submodule in 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 for detailed instructions and other useful links.

Additionally, for FreeRTOS kernel feature information refer to the Developer Documentation, and API Reference.

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.

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.