1 ; FreeRTOS.org V4.3.0 - Copyright (C) 2003-2007 Richard Barry.
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3 ; This file is part of the FreeRTOS.org distribution.
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5 ; FreeRTOS.org is free software; you can redistribute it and/or modify
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6 ; it under the terms of the GNU General Public License as published by
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7 ; the Free Software Foundation; either version 2 of the License, or
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8 ; (at your option) any later version.
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10 ; FreeRTOS.org is distributed in the hope that it will be useful,
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11 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 ; GNU General Public License for more details.
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15 ; You should have received a copy of the GNU General Public License
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16 ; along with FreeRTOS.org; if not, write to the Free Software
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17 ; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 ; A special exception to the GPL can be applied should you wish to distribute
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20 ; a combined work that includes FreeRTOS.org, without being obliged to provide
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21 ; the source code for any proprietary components. See the licensing section
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22 ; of http://www.FreeRTOS.org for full details of how and when the exception
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25 ; ***************************************************************************
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26 ; See http://www.FreeRTOS.org for documentation, latest information, license
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27 ; and contact details. Please ensure to read the configuration and relevant
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28 ; port sections of the online documentation.
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29 ; ***************************************************************************
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34 EXTERN vPortPreemptiveTick
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35 EXTERN vTaskSwitchContext
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37 PUBLIC vPortYieldProcessor
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38 PUBLIC vPortStartFirstTask
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40 #include "ISR_Support.h"
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42 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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43 ; Starting the first task is just a matter of restoring the context that
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44 ; was created by pxPortInitialiseStack().
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45 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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46 vPortStartFirstTask:
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49 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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50 ; Manual context switch function. This is the SWI hander.
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51 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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52 vPortYieldProcessor:
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53 ADD LR, LR, #4 ; Add 4 to the LR to make the LR appear exactly
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54 ; as if the context was saved during and IRQ
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57 portSAVE_CONTEXT ; Save the context of the current task...
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58 LDR R0, =vTaskSwitchContext ; before selecting the next task to execute.
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61 portRESTORE_CONTEXT ; Restore the context of the selected task.
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