mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
synced 2025-04-19 21:11:57 -04:00
130 lines
6 KiB
C
130 lines
6 KiB
C
/*
|
|
FreeRTOS V9.0.1 - Copyright (C) 2017 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!
|
|
*/
|
|
|
|
#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
|
|
|