/* | |
FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd. | |
All rights reserved | |
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 | |
compatible FAT file system, and our tiny thread aware UDP/IP stack. | |
http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High | |
Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS | |
licenses offer ticketed support, indemnification and 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! | |
*/ | |
#ifndef PORT_ASM_H | |
#define PORT_ASM_H | |
typedef void TCB_t; | |
extern volatile TCB_t * volatile pxCurrentTCB; | |
extern void vTaskSwitchContext( void ); | |
/* | |
* Saves the stack pointer for one task into its TCB, calls | |
* vTaskSwitchContext() to update the TCB being used, then restores the stack | |
* from the new TCB read to run the task. | |
*/ | |
void portSWITCH_CONTEXT( void ); | |
/* | |
* Load the stack pointer from the TCB of the task which is going to be first | |
* to execute. Then force an IRET so the registers and IP are popped off the | |
* stack. | |
*/ | |
void portFIRST_CONTEXT( void ); | |
/* There are slightly different versions depending on whether you are building | |
to include debugger information. If debugger information is used then there | |
are a couple of extra bytes left of the ISR stack (presumably for use by the | |
debugger). The true stack pointer is then stored in the bp register. We add | |
2 to the stack pointer to remove the extra bytes before we restore our context. */ | |
#define portSWITCH_CONTEXT() \ | |
asm { mov ax, seg pxCurrentTCB } \ | |
asm { mov ds, ax } \ | |
asm { les bx, pxCurrentTCB } /* Save the stack pointer into the TCB. */ \ | |
asm { mov es:0x2[ bx ], ss } \ | |
asm { mov es:[ bx ], sp } \ | |
asm { call far ptr vTaskSwitchContext } /* Perform the switch. */ \ | |
asm { mov ax, seg pxCurrentTCB } /* Restore the stack pointer from the TCB. */ \ | |
asm { mov ds, ax } \ | |
asm { les bx, dword ptr pxCurrentTCB } \ | |
asm { mov ss, es:[ bx + 2 ] } \ | |
asm { mov sp, es:[ bx ] } | |
#define portFIRST_CONTEXT() \ | |
__asm { mov ax, seg pxCurrentTCB } \ | |
__asm { mov ds, ax } \ | |
__asm { les bx, dword ptr pxCurrentTCB } \ | |
__asm { mov ss, es:[ bx + 2 ] } \ | |
__asm { mov sp, es:[ bx ] } \ | |
__asm { pop bp } \ | |
__asm { pop di } \ | |
__asm { pop si } \ | |
__asm { pop ds } \ | |
__asm { pop es } \ | |
__asm { pop dx } \ | |
__asm { pop cx } \ | |
__asm { pop bx } \ | |
__asm { pop ax } \ | |
__asm { iret } | |
#endif | |