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jeremybenn |
/*
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FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* If you are: *
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* *
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* + New to FreeRTOS, *
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* + Wanting to learn FreeRTOS or multitasking in general quickly *
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* + Looking for basic training, *
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* + Wanting to improve your FreeRTOS skills and productivity *
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* *
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* then take a look at the FreeRTOS books - available as PDF or paperback *
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* *
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* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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* http://www.FreeRTOS.org/Documentation *
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* *
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* A pdf reference manual is also available. Both are usually delivered *
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* to your inbox within 20 minutes to two hours when purchased between 8am *
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* and 8pm GMT (although please allow up to 24 hours in case of *
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* exceptional circumstances). Thank you for your support! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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***NOTE*** The exception to the GPL is included to allow you to distribute
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a combined work that includes FreeRTOS without being obliged to provide the
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source code for proprietary components outside of the FreeRTOS kernel.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details. You should have received a copy of the GNU General Public
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License and the FreeRTOS license exception along with FreeRTOS; if not it
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can be viewed here: http://www.freertos.org/a00114.html and also obtained
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by writing to Richard Barry, contact details for whom are available on the
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FreeRTOS WEB site.
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1 tab == 4 spaces!
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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.global _vPortYield
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.extern _vTaskSwitchContext
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.extern uxCriticalNesting
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_vPortYield:
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PUSH SR /* Save the SR used by the task.... */
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PUSH W0 /* ....then disable interrupts. */
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MOV #32, W0
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MOV W0, SR
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PUSH W1 /* Save registers to the stack. */
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PUSH.D W2
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PUSH.D W4
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PUSH.D W6
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PUSH.D W8
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PUSH.D W10
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PUSH.D W12
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PUSH W14
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PUSH RCOUNT
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PUSH TBLPAG
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PUSH CORCON
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PUSH PSVPAG
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MOV _uxCriticalNesting, W0 /* Save the critical nesting counter for the task. */
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PUSH W0
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MOV _pxCurrentTCB, W0 /* Save the new top of stack into the TCB. */
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MOV W15, [W0]
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call _vTaskSwitchContext
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MOV _pxCurrentTCB, W0 /* Restore the stack pointer for the task. */
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MOV [W0], W15
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POP W0 /* Restore the critical nesting counter for the task. */
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MOV W0, _uxCriticalNesting
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POP PSVPAG
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POP CORCON
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POP TBLPAG
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POP RCOUNT /* Restore the registers from the stack. */
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POP W14
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POP.D W12
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POP.D W10
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POP.D W8
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POP.D W6
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POP.D W4
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POP.D W2
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POP.D W0
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POP SR
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return
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.end
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