/* | |
FreeRTOS V7.5.1 - Copyright (C) 2013 Real Time Engineers Ltd. | |
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. | |
*************************************************************************** | |
* * | |
* FreeRTOS provides completely free yet professionally developed, * | |
* robust, strictly quality controlled, supported, and cross * | |
* platform software that has become a de facto standard. * | |
* * | |
* Help yourself get started quickly and support the FreeRTOS * | |
* project by purchasing a FreeRTOS tutorial book, reference * | |
* manual, or both from: http://www.FreeRTOS.org/Documentation * | |
* * | |
* Thank you! * | |
* * | |
*************************************************************************** | |
This file is part of the FreeRTOS distribution. | |
FreeRTOS is free software; you can redistribute it and/or modify it under | |
the terms of the GNU General Public License (version 2) as published by the | |
Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception. | |
>>! NOTE: The modification to the GPL is included to allow you to distribute | |
>>! a combined work that includes FreeRTOS without being obliged to provide | |
>>! the source code for proprietary components outside of the FreeRTOS | |
>>! kernel. | |
FreeRTOS 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. Full license text is available from the following | |
link: http://www.freertos.org/a00114.html | |
1 tab == 4 spaces! | |
*************************************************************************** | |
* * | |
* Having a problem? Start by reading the FAQ "My application does * | |
* not run, what could be wrong?" * | |
* * | |
* http://www.FreeRTOS.org/FAQHelp.html * | |
* * | |
*************************************************************************** | |
http://www.FreeRTOS.org - Documentation, books, training, latest versions, | |
license and Real Time Engineers Ltd. contact details. | |
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
including FreeRTOS+Trace - an indispensable productivity tool, a DOS | |
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety | |
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mission critical applications that require provable dependability. | |
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*/ | |
/* | |
Changes from V1.00: | |
+ pxPortInitialiseStack() now initialises the stack of new tasks to the | |
same format used by the compiler. This allows the compiler generated | |
interrupt mechanism to be used for context switches. | |
Changes from V2.6.1 | |
+ Move usPortCheckFreeStackSpace() to tasks.c. | |
*/ | |
#include <dos.h> | |
#include <stdlib.h> | |
#include "FreeRTOS.h" | |
/*-----------------------------------------------------------*/ | |
/* See header file for description. */ | |
portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters ) | |
{ | |
portSTACK_TYPE DS_Reg = 0; | |
/* Place a few bytes of known values on the bottom of the stack. | |
This is just useful for debugging. */ | |
*pxTopOfStack = 0x1111; | |
pxTopOfStack--; | |
*pxTopOfStack = 0x2222; | |
pxTopOfStack--; | |
*pxTopOfStack = 0x3333; | |
pxTopOfStack--; | |
*pxTopOfStack = 0x4444; | |
pxTopOfStack--; | |
*pxTopOfStack = 0x5555; | |
pxTopOfStack--; | |
/*lint -e950 -e611 -e923 Lint doesn't like this much - but nothing I can do about it. */ | |
/* We are going to start the scheduler using a return from interrupt | |
instruction to load the program counter, so first there would be the | |
function call with parameters preamble. */ | |
*pxTopOfStack = FP_SEG( pvParameters ); | |
pxTopOfStack--; | |
*pxTopOfStack = FP_OFF( pvParameters ); | |
pxTopOfStack--; | |
*pxTopOfStack = FP_SEG( pxCode ); | |
pxTopOfStack--; | |
*pxTopOfStack = FP_OFF( pxCode ); | |
pxTopOfStack--; | |
/* Next the status register and interrupt return address. */ | |
*pxTopOfStack = portINITIAL_SW; | |
pxTopOfStack--; | |
*pxTopOfStack = FP_SEG( pxCode ); | |
pxTopOfStack--; | |
*pxTopOfStack = FP_OFF( pxCode ); | |
pxTopOfStack--; | |
/* The remaining registers would be pushed on the stack by our context | |
switch function. These are loaded with values simply to make debugging | |
easier. */ | |
*pxTopOfStack = ( portSTACK_TYPE ) 0xAAAA; /* AX */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0xBBBB; /* BX */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0xCCCC; /* CX */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0xDDDD; /* DX */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0xEEEE; /* ES */ | |
pxTopOfStack--; | |
/* We need the true data segment. */ | |
__asm{ MOV DS_Reg, DS }; | |
*pxTopOfStack = DS_Reg; /* DS */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0x0123; /* SI */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0xDDDD; /* DI */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0xBBBB; /* BP */ | |
/*lint +e950 +e611 +e923 */ | |
return pxTopOfStack; | |
} | |
/*-----------------------------------------------------------*/ | |