/* | |
FreeRTOS V7.2.0 - Copyright (C) 2012 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! | |
*************************************************************************** | |
* * | |
* Having a problem? Start by reading the FAQ "My application does * | |
* not run, what could be wrong? * | |
* * | |
* http://www.FreeRTOS.org/FAQHelp.html * | |
* * | |
*************************************************************************** | |
http://www.FreeRTOS.org - Documentation, training, latest information, | |
license and contact details. | |
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
including FreeRTOS+Trace - an indispensable productivity tool. | |
Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell | |
the code with commercial support, indemnification, and middleware, under | |
the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also | |
provide a safety engineered and independently SIL3 certified version under | |
the SafeRTOS brand: http://www.SafeRTOS.com. | |
*/ | |
.global _vPortYield | |
.extern _vTaskSwitchContext | |
.extern uxCriticalNesting | |
_vPortYield: | |
PUSH SR /* Save the SR used by the task.... */ | |
PUSH W0 /* ....then disable interrupts. */ | |
MOV #32, W0 | |
MOV W0, SR | |
PUSH W1 /* Save registers to the stack. */ | |
PUSH.D W2 | |
PUSH.D W4 | |
PUSH.D W6 | |
PUSH.D W8 | |
PUSH.D W10 | |
PUSH.D W12 | |
PUSH W14 | |
PUSH RCOUNT | |
PUSH TBLPAG | |
PUSH ACCAL | |
PUSH ACCAH | |
PUSH ACCAU | |
PUSH ACCBL | |
PUSH ACCBH | |
PUSH ACCBU | |
PUSH DCOUNT | |
PUSH DOSTARTL | |
PUSH DOSTARTH | |
PUSH DOENDL | |
PUSH DOENDH | |
PUSH CORCON | |
PUSH PSVPAG | |
MOV _uxCriticalNesting, W0 /* Save the critical nesting counter for the task. */ | |
PUSH W0 | |
MOV _pxCurrentTCB, W0 /* Save the new top of stack into the TCB. */ | |
MOV W15, [W0] | |
call _vTaskSwitchContext | |
MOV _pxCurrentTCB, W0 /* Restore the stack pointer for the task. */ | |
MOV [W0], W15 | |
POP W0 /* Restore the critical nesting counter for the task. */ | |
MOV W0, _uxCriticalNesting | |
POP PSVPAG | |
POP CORCON | |
POP DOENDH | |
POP DOENDL | |
POP DOSTARTH | |
POP DOSTARTL | |
POP DCOUNT | |
POP ACCBU | |
POP ACCBH | |
POP ACCBL | |
POP ACCAU | |
POP ACCAH | |
POP ACCAL | |
POP TBLPAG | |
POP RCOUNT /* Restore the registers from the stack. */ | |
POP W14 | |
POP.D W12 | |
POP.D W10 | |
POP.D W8 | |
POP.D W6 | |
POP.D W4 | |
POP.D W2 | |
POP.D W0 | |
POP SR | |
return | |
.end |