| /* | |
| 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 V2.4.2: | |
| + pvPortMalloc and vPortFree have been removed. The projects now use | |
| the definitions from the source/portable/MemMang directory. | |
| Changes from V2.6.1: | |
| + usPortCheckFreeStackSpace() has been moved to tasks.c. | |
| */ | |
| #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, *pxOriginalSP; | |
| /* 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 | |
| status register and interrupt return address. We make this the start | |
| of the task. */ | |
| *pxTopOfStack = portINITIAL_SW; | |
| pxTopOfStack--; | |
| *pxTopOfStack = FP_SEG( pxCode ); | |
| pxTopOfStack--; | |
| *pxTopOfStack = FP_OFF( pxCode ); | |
| pxTopOfStack--; | |
| /* We are going to setup the stack for the new task to look like | |
| the stack frame was setup by a compiler generated ISR. We need to know | |
| the address of the existing stack top to place in the SP register within | |
| the stack frame. pxOriginalSP holds SP before (simulated) pusha was | |
| called. */ | |
| pxOriginalSP = 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 = FP_OFF( pvParameters ); /* AX */ | |
| pxTopOfStack--; | |
| *pxTopOfStack = ( StackType_t ) 0xCCCC; /* CX */ | |
| pxTopOfStack--; | |
| *pxTopOfStack = FP_SEG( pvParameters ); /* DX */ | |
| pxTopOfStack--; | |
| *pxTopOfStack = ( StackType_t ) 0xBBBB; /* BX */ | |
| pxTopOfStack--; | |
| *pxTopOfStack = FP_OFF( pxOriginalSP ); /* SP */ | |
| pxTopOfStack--; | |
| *pxTopOfStack = ( StackType_t ) 0xBBBB; /* BP */ | |
| pxTopOfStack--; | |
| *pxTopOfStack = ( StackType_t ) 0x0123; /* SI */ | |
| pxTopOfStack--; | |
| *pxTopOfStack = ( StackType_t ) 0xDDDD; /* DI */ | |
| /* We need the true data segment. */ | |
| __asm{ MOV DS_Reg, DS }; | |
| pxTopOfStack--; | |
| *pxTopOfStack = DS_Reg; /* DS */ | |
| pxTopOfStack--; | |
| *pxTopOfStack = ( StackType_t ) 0xEEEE; /* ES */ | |
| /* The AX register is pushed again twice - don't know why. */ | |
| pxTopOfStack--; | |
| *pxTopOfStack = FP_OFF( pvParameters ); /* AX */ | |
| pxTopOfStack--; | |
| *pxTopOfStack = FP_OFF( pvParameters ); /* AX */ | |
| #ifdef DEBUG_BUILD | |
| /* The compiler adds space to each ISR stack if building to | |
| include debug information. Presumably this is used by the | |
| debugger - we don't need to initialise it to anything just | |
| make sure it is there. */ | |
| pxTopOfStack--; | |
| #endif | |
| /*lint +e950 +e611 +e923 */ | |
| return pxTopOfStack; | |
| } | |
| /*-----------------------------------------------------------*/ | |