1 ; FreeRTOS.org V4.2.0 - Copyright (C) 2003-2007 Richard Barry.
\r
3 ; This file is part of the FreeRTOS.org distribution.
\r
5 ; FreeRTOS.org is free software; you can redistribute it and/or modify
\r
6 ; it under the terms of the GNU General Public License as published by
\r
7 ; the Free Software Foundation; either version 2 of the License, or
\r
8 ; (at your option) any later version.
\r
10 ; FreeRTOS.org is distributed in the hope that it will be useful,
\r
11 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
\r
12 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\r
13 ; GNU General Public License for more details.
\r
15 ; You should have received a copy of the GNU General Public License
\r
16 ; along with FreeRTOS.org; if not, write to the Free Software
\r
17 ; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
\r
19 ; A special exception to the GPL can be applied should you wish to distribute
\r
20 ; a combined work that includes FreeRTOS.org, without being obliged to provide
\r
21 ; the source code for any proprietary components. See the licensing section
\r
22 ; of http://www.FreeRTOS.org for full details of how and when the exception
\r
25 ; ***************************************************************************
\r
26 ; See http://www.FreeRTOS.org for documentation, latest information, license
\r
27 ; and contact details. Please ensure to read the configuration and relevant
\r
28 ; port sections of the online documentation.
\r
29 ; ***************************************************************************
\r
34 EXTERN vPortPreemptiveTick
\r
35 EXTERN vTaskSwitchContext
\r
37 PUBLIC vPortYieldProcessor
\r
38 PUBLIC vPortStartFirstTask
\r
40 #include "ISR_Support.h"
\r
42 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
\r
43 ; Starting the first task is just a matter of restoring the context that
\r
44 ; was created by pxPortInitialiseStack().
\r
45 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
\r
46 vPortStartFirstTask:
\r
49 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
\r
50 ; Manual context switch function. This is the SWI hander.
\r
51 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
\r
52 vPortYieldProcessor:
\r
53 ADD LR, LR, #4 ; Add 4 to the LR to make the LR appear exactly
\r
54 ; as if the context was saved during and IRQ
\r
57 portSAVE_CONTEXT ; Save the context of the current task...
\r
58 LDR R0, =vTaskSwitchContext ; before selecting the next task to execute.
\r
61 portRESTORE_CONTEXT ; Restore the context of the selected task.
\r