2 FreeRTOS.org V4.2.0 - Copyright (C) 2003-2007 Richard Barry.
\r
4 This file is part of the FreeRTOS distribution.
\r
6 FreeRTOS is free software; you can redistribute it and/or modify
\r
7 it under the terms of the GNU General Public License as published by
\r
8 the Free Software Foundation; either version 2 of the License, or
\r
9 (at your option) any later version.
\r
11 FreeRTOS is distributed in the hope that it will be useful,
\r
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
\r
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\r
14 GNU General Public License for more details.
\r
16 You should have received a copy of the GNU General Public License
\r
17 along with FreeRTOS; if not, write to the Free Software
\r
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
\r
20 A special exception to the GPL can be applied should you wish to distribute
\r
21 a combined work that includes FreeRTOS, without being obliged to provide
\r
22 the source code for any proprietary components. See the licensing section
\r
23 of http://www.FreeRTOS.org for full details of how and when the exception
\r
26 ***************************************************************************
\r
27 See http://www.FreeRTOS.org for documentation, latest information, license
\r
28 and contact details. Please ensure to read the configuration and relevant
\r
29 port sections of the online documentation.
\r
30 ***************************************************************************
\r
36 EXTERN vTaskSwitchContext
\r
38 PUBLIC vPortYieldProcessor
\r
39 PUBLIC vPortStartFirstTask
\r
41 #include "ISR_Support.h"
\r
43 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
\r
44 ; Starting the first task is just a matter of restoring the context that
\r
45 ; was created by pxPortInitialiseStack().
\r
46 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
\r
47 vPortStartFirstTask:
\r
50 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
\r
51 ; Manual context switch function. This is the SWI hander.
\r
52 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
\r
53 vPortYieldProcessor:
\r
54 ADD LR, LR, #4 ; Add 4 to the LR to make the LR appear exactly
\r
55 ; as if the context was saved during and IRQ
\r
58 portSAVE_CONTEXT ; Save the context of the current task...
\r
59 LDR R0, =vTaskSwitchContext ; before selecting the next task to execute.
\r
62 portRESTORE_CONTEXT ; Restore the context of the selected task.
\r