/* | |
FreeRTOS V9.0.1 - Copyright (C) 2017 Real Time Engineers Ltd. | |
All rights reserved | |
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. | |
This file is part of the FreeRTOS distribution. | |
FreeRTOS is free software; you can redistribute it and/or modify it under | |
the terms of the GNU General Public License (version 2) as published by the | |
Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception. | |
*************************************************************************** | |
>>! NOTE: The modification to the GPL is included to allow you to !<< | |
>>! distribute a combined work that includes FreeRTOS without being !<< | |
>>! obliged to provide the source code for proprietary components !<< | |
>>! outside of the FreeRTOS kernel. !<< | |
*************************************************************************** | |
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY | |
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
FOR A PARTICULAR PURPOSE. Full license text is available on the following | |
link: http://www.freertos.org/a00114.html | |
*************************************************************************** | |
* * | |
* FreeRTOS provides completely free yet professionally developed, * | |
* robust, strictly quality controlled, supported, and cross * | |
* platform software that is more than just the market leader, it * | |
* is the industry's de facto standard. * | |
* * | |
* Help yourself get started quickly while simultaneously helping * | |
* to support the FreeRTOS project by purchasing a FreeRTOS * | |
* tutorial book, reference manual, or both: * | |
* http://www.FreeRTOS.org/Documentation * | |
* * | |
*************************************************************************** | |
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading | |
the FAQ page "My application does not run, what could be wrong?". Have you | |
defined configASSERT()? | |
http://www.FreeRTOS.org/support - In return for receiving this top quality | |
embedded software for free we request you assist our global community by | |
participating in the support forum. | |
http://www.FreeRTOS.org/training - Investing in training allows your team to | |
be as productive as possible as early as possible. Now you can receive | |
FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers | |
Ltd, and the world's leading authority on the world's leading RTOS. | |
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
including FreeRTOS+Trace - an indispensable productivity tool, a DOS | |
compatible FAT file system, and our tiny thread aware UDP/IP stack. | |
http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate. | |
Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS. | |
http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High | |
Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS | |
licenses offer ticketed support, indemnification and commercial middleware. | |
http://www.SafeRTOS.com - High Integrity Systems also provide a safety | |
engineered and independently SIL3 certified version for use in safety and | |
mission critical applications that require provable dependability. | |
1 tab == 4 spaces! | |
*/ | |
#include "FreeRTOSConfig.h" | |
#include "ISR_Support.h" | |
.global _vPortYield | |
.global _vPortStartFirstTask | |
.global _vPortTickISR | |
.extern _vTaskSwitchContext | |
.extern _xTaskIncrementTick | |
.text | |
.align 2 | |
/* FreeRTOS yield handler. This is installed as the BRK software interrupt | |
handler. */ | |
_vPortYield: | |
/* Save the context of the current task. */ | |
portSAVE_CONTEXT | |
/* Call the scheduler to select the next task. */ | |
call !!_vTaskSwitchContext | |
/* Restore the context of the next task to run. */ | |
portRESTORE_CONTEXT | |
retb | |
/* Starts the scheduler by restoring the context of the task that will execute | |
first. */ | |
.align 2 | |
_vPortStartFirstTask: | |
/* Restore the context of whichever task will execute first. */ | |
portRESTORE_CONTEXT | |
/* An interrupt stack frame is used so the task is started using RETI. */ | |
reti | |
/* FreeRTOS tick handler. This is installed as the interval timer interrupt | |
handler. */ | |
.align 2 | |
_vPortTickISR: | |
/* Save the context of the currently executing task. */ | |
portSAVE_CONTEXT | |
/* Call the RTOS tick function. */ | |
call !!_xTaskIncrementTick | |
#if configUSE_PREEMPTION == 1 | |
/* Select the next task to run. */ | |
call !!_vTaskSwitchContext | |
#endif | |
/* Retore the context of whichever task will run next. */ | |
portRESTORE_CONTEXT | |
reti | |
.end | |