mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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158 lines
7.5 KiB
C
158 lines
7.5 KiB
C
/*
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FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd.
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FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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***************************************************************************
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* *
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* FreeRTOS tutorial books are available in pdf and paperback. *
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* Complete, revised, and edited pdf reference manuals are also *
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* available. *
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* *
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* Purchasing FreeRTOS documentation will not only help you, by *
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* ensuring you get running as quickly as possible and with an *
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* in-depth knowledge of how to use FreeRTOS, it will also help *
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* the FreeRTOS project to continue with its mission of providing *
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* professional grade, cross platform, de facto standard solutions *
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* for microcontrollers - completely free of charge! *
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* *
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* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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* *
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* Thank you for using FreeRTOS, and thank you for your support! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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>>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to
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distribute a combined work that includes FreeRTOS without being obliged to
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provide the source code for proprietary components outside of the FreeRTOS
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kernel.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details. You should have received a copy of the GNU General Public License
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and the FreeRTOS license exception along with FreeRTOS; if not it can be
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viewed here: http://www.freertos.org/a00114.html and also obtained by
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writing to Real Time Engineers Ltd., contact details for whom are available
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on the FreeRTOS WEB site.
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1 tab == 4 spaces!
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***************************************************************************
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* *
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* Having a problem? Start by reading the FAQ "My application does *
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* not run, what could be wrong?" *
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* *
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* http://www.FreeRTOS.org/FAQHelp.html *
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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license and Real Time Engineers Ltd. contact details.
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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including FreeRTOS+Trace - an indispensable productivity tool, and our new
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fully thread aware and reentrant UDP/IP stack.
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http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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Integrity Systems, who sell the code with commercial support,
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indemnification and middleware, under the OpenRTOS brand.
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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engineered and independently SIL3 certified version for use in safety and
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mission critical applications that require provable dependability.
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*/
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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 portSWITCH_CONTEXT( 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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/* There are slightly different versions depending on whether you are building
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to include debugger information. If debugger information is used then there
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are a couple of extra bytes left of the ISR stack (presumably for use by the
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debugger). The true stack pointer is then stored in the bp register. We add
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2 to the stack pointer to remove the extra bytes before we restore our context. */
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#ifdef DEBUG_BUILD
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#pragma aux portSWITCH_CONTEXT = "mov ax, seg pxCurrentTCB" \
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"mov ds, ax" \
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"les bx, pxCurrentTCB" /* Save the stack pointer into the TCB. */ \
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"mov es:0x2[ bx ], ss" \
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"mov es:[ bx ], sp" \
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"call vTaskSwitchContext" /* Perform the switch. */ \
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"mov ax, seg pxCurrentTCB" /* Restore the stack pointer from the TCB. */ \
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"mov ds, ax" \
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"les bx, dword ptr pxCurrentTCB" \
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"mov ss, es:[ bx + 2 ]" \
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"mov sp, es:[ bx ]" \
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"mov bp, sp" /* Prepair the bp register for the restoration of the SP in the compiler generated portion of the ISR */ \
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"add bp, 0x0002"
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#pragma aux portFIRST_CONTEXT = "mov ax, seg pxCurrentTCB" \
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"mov ds, ax" \
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"les bx, dword ptr pxCurrentTCB" \
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"mov ss, es:[ bx + 2 ]" \
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"mov sp, es:[ bx ]" \
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"add sp, 0x0002" /* Remove the extra bytes that exist in debug builds before restoring the context. */ \
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"pop ax" \
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"pop ax" \
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"pop es" \
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"pop ds" \
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"popa" \
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"iret"
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#else
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#pragma aux portSWITCH_CONTEXT = "mov ax, seg pxCurrentTCB" \
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"mov ds, ax" \
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"les bx, pxCurrentTCB" /* Save the stack pointer into the TCB. */ \
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"mov es:0x2[ bx ], ss" \
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"mov es:[ bx ], sp" \
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"call vTaskSwitchContext" /* Perform the switch. */ \
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"mov ax, seg pxCurrentTCB" /* Restore the stack pointer from the TCB. */ \
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"mov ds, ax" \
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"les bx, dword ptr pxCurrentTCB" \
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"mov ss, es:[ bx + 2 ]" \
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"mov sp, es:[ bx ]"
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#pragma aux portFIRST_CONTEXT = "mov ax, seg pxCurrentTCB" \
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"mov ds, ax" \
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"les bx, dword ptr pxCurrentTCB" \
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"mov ss, es:[ bx + 2 ]" \
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"mov sp, es:[ bx ]" \
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"pop ax" \
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"pop ax" \
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"pop es" \
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"pop ds" \
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"popa" \
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"iret"
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#endif
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