/* | |
FreeRTOS.org V5.1.2 - Copyright (C) 2003-2009 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 | |
can be applied. | |
*************************************************************************** | |
*************************************************************************** | |
* * | |
* Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation * | |
* * | |
* This is a concise, step by step, 'hands on' guide that describes both * | |
* general multitasking concepts and FreeRTOS specifics. It presents and * | |
* explains numerous examples that are written using the FreeRTOS API. * | |
* Full source code for all the examples is provided in an accompanying * | |
* .zip file. * | |
* * | |
*************************************************************************** | |
*************************************************************************** | |
Please ensure to read the configuration and relevant port sections of the | |
online documentation. | |
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 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 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 |