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130 lines
4.3 KiB
C
130 lines
4.3 KiB
C
/*
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FreeRTOS.org V4.6.1 - Copyright (C) 2003-2007 Richard Barry.
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This file is part of the FreeRTOS.org distribution.
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FreeRTOS.org is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FreeRTOS.org is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FreeRTOS.org; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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A special exception to the GPL can be applied should you wish to distribute
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a combined work that includes FreeRTOS.org, without being obliged to provide
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the source code for any proprietary components. See the licensing section
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of http://www.FreeRTOS.org for full details of how and when the exception
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can be applied.
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***************************************************************************
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See http://www.FreeRTOS.org for documentation, latest information, license
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and contact details. Please ensure to read the configuration and relevant
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port sections of the online documentation.
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Also see http://www.SafeRTOS.com a version that has been certified for use
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in safety critical systems, plus commercial licensing, development and
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support options.
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***************************************************************************
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*/
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/*
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Changes from V1.00:
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+ pxPortInitialiseStack() now initialises the stack of new tasks to the
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same format used by the compiler. This allows the compiler generated
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interrupt mechanism to be used for context switches.
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Changes from V2.6.1
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+ Move usPortCheckFreeStackSpace() to tasks.c.
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*/
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#include <dos.h>
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#include <stdlib.h>
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#include "FreeRTOS.h"
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/*-----------------------------------------------------------*/
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/* See header file for description. */
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portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
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{
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portSTACK_TYPE DS_Reg = 0;
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/* Place a few bytes of known values on the bottom of the stack.
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This is just useful for debugging. */
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*pxTopOfStack = 0x1111;
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pxTopOfStack--;
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*pxTopOfStack = 0x2222;
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pxTopOfStack--;
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*pxTopOfStack = 0x3333;
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pxTopOfStack--;
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*pxTopOfStack = 0x4444;
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pxTopOfStack--;
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*pxTopOfStack = 0x5555;
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pxTopOfStack--;
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/*lint -e950 -e611 -e923 Lint doesn't like this much - but nothing I can do about it. */
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/* We are going to start the scheduler using a return from interrupt
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instruction to load the program counter, so first there would be the
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function call with parameters preamble. */
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*pxTopOfStack = FP_SEG( pvParameters );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pvParameters );
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxCode );
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pxTopOfStack--;
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/* Next the status register and interrupt return address. */
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*pxTopOfStack = portINITIAL_SW;
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxCode );
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pxTopOfStack--;
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/* The remaining registers would be pushed on the stack by our context
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switch function. These are loaded with values simply to make debugging
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easier. */
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*pxTopOfStack = ( portSTACK_TYPE ) 0xAAAA; /* AX */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0xBBBB; /* BX */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0xCCCC; /* CX */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0xDDDD; /* DX */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0xEEEE; /* ES */
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pxTopOfStack--;
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/* We need the true data segment. */
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__asm{ MOV DS_Reg, DS };
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*pxTopOfStack = DS_Reg; /* DS */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0x0123; /* SI */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0xDDDD; /* DI */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0xBBBB; /* BP */
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/*lint +e950 +e611 +e923 */
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return pxTopOfStack;
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}
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/*-----------------------------------------------------------*/
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