/* | |
FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd. | |
All rights reserved | |
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. | |
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 on the following | |
link: http://www.freertos.org/a00114.html | |
*************************************************************************** | |
* * | |
* FreeRTOS provides completely free yet professionally developed, * | |
* robust, strictly quality controlled, supported, and cross * | |
* platform software that is more than just the market leader, it * | |
* is the industry's de facto standard. * | |
* * | |
* Help yourself get started quickly while simultaneously helping * | |
* to support the FreeRTOS project by purchasing a FreeRTOS * | |
* tutorial book, reference manual, or both: * | |
* http://www.FreeRTOS.org/Documentation * | |
* * | |
*************************************************************************** | |
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading | |
the FAQ page "My application does not run, what could be wrong?". Have you | |
defined configASSERT()? | |
http://www.FreeRTOS.org/support - In return for receiving this top quality | |
embedded software for free we request you assist our global community by | |
participating in the support forum. | |
http://www.FreeRTOS.org/training - Investing in training allows your team to | |
be as productive as possible as early as possible. Now you can receive | |
FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers | |
Ltd, and the world's leading authority on the world's leading RTOS. | |
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
including FreeRTOS+Trace - an indispensable productivity tool, a DOS | |
compatible FAT file system, and our tiny thread aware UDP/IP stack. | |
http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate. | |
Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS. | |
http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High | |
Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS | |
licenses offer ticketed support, indemnification and commercial middleware. | |
http://www.SafeRTOS.com - High Integrity Systems also provide a safety | |
engineered and independently SIL3 certified version for use in safety and | |
mission critical applications that require provable dependability. | |
1 tab == 4 spaces! | |
*/ | |
/* | |
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. */ | |
StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters ) | |
{ | |
StackType_t 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 = ( StackType_t ) 0xAAAA; /* AX */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BX */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( StackType_t ) 0xCCCC; /* CX */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( StackType_t ) 0xDDDD; /* DX */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( StackType_t ) 0xEEEE; /* ES */ | |
pxTopOfStack--; | |
/* We need the true data segment. */ | |
__asm{ MOV DS_Reg, DS }; | |
*pxTopOfStack = DS_Reg; /* DS */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( StackType_t ) 0x0123; /* SI */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( StackType_t ) 0xDDDD; /* DI */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BP */ | |
/*lint +e950 +e611 +e923 */ | |
return pxTopOfStack; | |
} | |
/*-----------------------------------------------------------*/ | |