;/* | |
; FreeRTOS V7.4.1 - Copyright (C) 2013 Real Time Engineers Ltd. | |
; | |
; | |
; *************************************************************************** | |
; * * | |
; * FreeRTOS tutorial books are available in pdf and paperback. * | |
; * Complete, revised, and edited pdf reference manuals are also * | |
; * available. * | |
; * * | |
; * Purchasing FreeRTOS documentation will not only help you, by * | |
; * ensuring you get running as quickly as possible and with an * | |
; * in-depth knowledge of how to use FreeRTOS, it will also help * | |
; * the FreeRTOS project to continue with its mission of providing * | |
; * professional grade, cross platform, de facto standard solutions * | |
; * for microcontrollers - completely free of charge! * | |
; * * | |
; * >>> See http://www.FreeRTOS.org/Documentation for details. <<< * | |
; * * | |
; * Thank you for using FreeRTOS, and thank you for your support! * | |
; * * | |
; *************************************************************************** | |
; | |
; | |
; 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. See the GNU General Public License for | |
; more details. You should have received a copy of the GNU General Public | |
; License and the FreeRTOS license exception along with FreeRTOS; if not it | |
; can be viewed here: http://www.freertos.org/a00114.html and also obtained | |
; by writing to Richard Barry, contact details for whom are available on the | |
; FreeRTOS WEB site. | |
; | |
; 1 tab == 4 spaces! | |
; | |
; http://www.FreeRTOS.org - Documentation, latest information, license and | |
; contact details. | |
; | |
; http://www.SafeRTOS.com - A version that is certified for use in safety | |
; critical systems. | |
; | |
; http://www.OpenRTOS.com - Commercial support, development, porting, | |
; licensing and training services. | |
;*/ | |
RSEG ICODE:CODE | |
CODE32 | |
EXTERN vPortPreemptiveTick | |
EXTERN vTaskSwitchContext | |
PUBLIC vPortYieldProcessor | |
PUBLIC vPortStartFirstTask | |
PUBLIC vPortPreemptiveTickISR | |
#include "ISR_Support.h" | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
; Starting the first task is just a matter of restoring the context that | |
; was created by pxPortInitialiseStack(). | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
vPortStartFirstTask: | |
portRESTORE_CONTEXT | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
; Manual context switch function. This is the SWI hander. | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
vPortYieldProcessor: | |
ADD LR, LR, #4 ; Add 4 to the LR to make the LR appear exactly | |
; as if the context was saved during and IRQ | |
; handler. | |
portSAVE_CONTEXT ; Save the context of the current task... | |
LDR R0, =vTaskSwitchContext ; before selecting the next task to execute. | |
mov lr, pc | |
BX R0 | |
portRESTORE_CONTEXT ; Restore the context of the selected task. | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
; Preemptive context switch function. This will only ever get used if | |
; portUSE_PREEMPTION is set to 1 in portmacro.h. | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
vPortPreemptiveTickISR: | |
portSAVE_CONTEXT ; Save the context of the current task. | |
LDR R0, =vPortPreemptiveTick ; Increment the tick count - this may wake a task. | |
MOV lr, pc | |
BX R0 | |
portRESTORE_CONTEXT ; Restore the context of the selected task. | |
END | |