blob: ba12ba332bfdab2e075e0b6dfd2945214ea0846b [file] [log] [blame]
/*
FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
***************************************************************************
* *
* If you are: *
* *
* + New to FreeRTOS, *
* + Wanting to learn FreeRTOS or multitasking in general quickly *
* + Looking for basic training, *
* + Wanting to improve your FreeRTOS skills and productivity *
* *
* then take a look at the FreeRTOS books - available as PDF or paperback *
* *
* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
* http://www.FreeRTOS.org/Documentation *
* *
* A pdf reference manual is also available. Both are usually delivered *
* to your inbox within 20 minutes to two hours when purchased between 8am *
* and 8pm GMT (although please allow up to 24 hours in case of *
* exceptional circumstances). 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 exception 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.
*/
.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