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97 lines
3.7 KiB
C
97 lines
3.7 KiB
C
/*
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FreeRTOS.org V5.3.0 - Copyright (C) 2003-2009 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 it
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under the terms of the GNU General Public License (version 2) as published
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by the Free Software Foundation and modified by the FreeRTOS exception.
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**NOTE** The exception to the GPL is included to allow you to distribute a
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combined work that includes FreeRTOS.org without being obliged to provide
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the source code for any proprietary components. Alternative commercial
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license and support terms are also available upon request. See the
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licensing section of http://www.FreeRTOS.org for full details.
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FreeRTOS.org is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along
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with FreeRTOS.org; if not, write to the Free Software Foundation, Inc., 59
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Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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***************************************************************************
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* *
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* Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
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* *
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* This is a concise, step by step, 'hands on' guide that describes both *
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* general multitasking concepts and FreeRTOS specifics. It presents and *
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* explains numerous examples that are written using the FreeRTOS API. *
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* Full source code for all the examples is provided in an accompanying *
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* .zip file. *
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* *
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***************************************************************************
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1 tab == 4 spaces!
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Please ensure to read the configuration and relevant port sections of the
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online documentation.
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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#ifndef PORT_ASM_H
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#define PORT_ASM_H
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typedef void tskTCB;
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extern volatile tskTCB * volatile pxCurrentTCB;
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extern void vTaskSwitchContext( void );
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/*
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* Saves the stack pointer for one task into its TCB, calls
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* vTaskSwitchContext() to update the TCB being used, then restores the stack
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* from the new TCB read to run the task.
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*/
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void portEND_SWITCHING_ISR( void );
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/*
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* Load the stack pointer from the TCB of the task which is going to be first
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* to execute. Then force an IRET so the registers and IP are popped off the
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* stack.
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*/
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void portFIRST_CONTEXT( void );
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#define portEND_SWITCHING_ISR() \
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asm { mov bx, [pxCurrentTCB] } \
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asm { mov word ptr [bx], sp } \
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asm { call far ptr vTaskSwitchContext } \
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asm { mov bx, [pxCurrentTCB] } \
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asm { mov sp, [bx] }
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#define portFIRST_CONTEXT() \
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asm { mov bx, [pxCurrentTCB] } \
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asm { mov sp, [bx] } \
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asm { pop bp } \
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asm { pop di } \
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asm { pop si } \
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asm { pop ds } \
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asm { pop es } \
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asm { pop dx } \
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asm { pop cx } \
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asm { pop bx } \
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asm { pop ax } \
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asm { iret }
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#endif
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