; FreeRTOS.org V5.0.4 - Copyright (C) 2003-2008 Richard Barry. | |
; | |
; This file is part of the FreeRTOS.org distribution. | |
; | |
; FreeRTOS.org is free software; you can redistribute it and/or modify | |
; it under the terms of the GNU General Public License as published by | |
; the Free Software Foundation; either version 2 of the License, or | |
; (at your option) any later version. | |
; | |
; FreeRTOS.org 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 | |
; along with FreeRTOS.org; if not, write to the Free Software | |
; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
; | |
; A special exception to the GPL can be applied should you wish to distribute | |
; a combined work that includes FreeRTOS.org, without being obliged to provide | |
; the source code for any proprietary components. See the licensing section | |
; of http://www.FreeRTOS.org for full details of how and when the exception | |
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; | |
; *************************************************************************** | |
; See http://www.FreeRTOS.org for documentation, latest information, license | |
; and contact details. Please ensure to read the configuration and relevant | |
; port sections of the online documentation. | |
; *************************************************************************** | |
RSEG ICODE:CODE | |
CODE32 | |
EXTERN vPortPreemptiveTick | |
EXTERN vTaskSwitchContext | |
PUBLIC vPortYieldProcessor | |
PUBLIC vPortStartFirstTask | |
#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. | |
END | |