first commit
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/*
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FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
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All rights reserved
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VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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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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***************************************************************************
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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 !<<
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>>! obliged to provide the source code for proprietary components !<<
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>>! outside of the FreeRTOS kernel. !<<
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***************************************************************************
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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. Full license text is available on the following
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link: http://www.freertos.org/a00114.html
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***************************************************************************
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* *
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* FreeRTOS provides completely free yet professionally developed, *
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* robust, strictly quality controlled, supported, and cross *
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* platform software that is more than just the market leader, it *
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* is the industry's de facto standard. *
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* *
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* Help yourself get started quickly while simultaneously helping *
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* to support the FreeRTOS project by purchasing a FreeRTOS *
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* tutorial book, reference manual, or both: *
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* http://www.FreeRTOS.org/Documentation *
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* *
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***************************************************************************
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http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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the FAQ page "My application does not run, what could be wrong?". Have you
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defined configASSERT()?
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http://www.FreeRTOS.org/support - In return for receiving this top quality
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embedded software for free we request you assist our global community by
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participating in the support forum.
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http://www.FreeRTOS.org/training - Investing in training allows your team to
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be as productive as possible as early as possible. Now you can receive
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FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
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Ltd, and the world's leading authority on the world's leading RTOS.
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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, a DOS
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compatible FAT file system, and our tiny thread aware UDP/IP stack.
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http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
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Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and commercial middleware.
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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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1 tab == 4 spaces!
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*/
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typedef void TCB_t;
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extern volatile TCB_t * 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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@@ -0,0 +1,183 @@
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/*
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FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
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All rights reserved
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VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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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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***************************************************************************
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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 !<<
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>>! obliged to provide the source code for proprietary components !<<
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>>! outside of the FreeRTOS kernel. !<<
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***************************************************************************
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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. Full license text is available on the following
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link: http://www.freertos.org/a00114.html
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***************************************************************************
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* *
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* FreeRTOS provides completely free yet professionally developed, *
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* robust, strictly quality controlled, supported, and cross *
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* platform software that is more than just the market leader, it *
|
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* is the industry's de facto standard. *
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* *
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* Help yourself get started quickly while simultaneously helping *
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* to support the FreeRTOS project by purchasing a FreeRTOS *
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* tutorial book, reference manual, or both: *
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* http://www.FreeRTOS.org/Documentation *
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* *
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***************************************************************************
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http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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the FAQ page "My application does not run, what could be wrong?". Have you
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defined configASSERT()?
|
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|
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http://www.FreeRTOS.org/support - In return for receiving this top quality
|
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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
|
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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,
|
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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
|
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Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
|
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licenses offer ticketed support, indemnification and commercial middleware.
|
||||
|
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety
|
||||
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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1 tab == 4 spaces!
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||||
*/
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/*
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Changes from V1.00:
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+ pxPortInitialiseStack() now initialises the stack of new tasks to the
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same format used by the compiler. This allows the compiler generated
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interrupt mechanism to be used for context switches.
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Changes from V2.4.2:
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+ pvPortMalloc and vPortFree have been removed. The projects now use
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the definitions from the source/portable/MemMang directory.
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Changes from V2.6.1:
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+ usPortCheckFreeStackSpace() has been moved to tasks.c.
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*/
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#include <stdlib.h>
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#include "FreeRTOS.h"
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/*-----------------------------------------------------------*/
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/* See header file for description. */
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StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
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{
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StackType_t DS_Reg = 0, *pxOriginalSP;
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/* Place a few bytes of known values on the bottom of the stack.
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This is just useful for debugging. */
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*pxTopOfStack = 0x1111;
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pxTopOfStack--;
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*pxTopOfStack = 0x2222;
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pxTopOfStack--;
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*pxTopOfStack = 0x3333;
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pxTopOfStack--;
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*pxTopOfStack = 0x4444;
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pxTopOfStack--;
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*pxTopOfStack = 0x5555;
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pxTopOfStack--;
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/*lint -e950 -e611 -e923 Lint doesn't like this much - but nothing I can do about it. */
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/* We are going to start the scheduler using a return from interrupt
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instruction to load the program counter, so first there would be the
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status register and interrupt return address. We make this the start
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of the task. */
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*pxTopOfStack = portINITIAL_SW;
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxCode );
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pxTopOfStack--;
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/* We are going to setup the stack for the new task to look like
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the stack frame was setup by a compiler generated ISR. We need to know
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the address of the existing stack top to place in the SP register within
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the stack frame. pxOriginalSP holds SP before (simulated) pusha was
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called. */
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pxOriginalSP = pxTopOfStack;
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/* The remaining registers would be pushed on the stack by our context
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switch function. These are loaded with values simply to make debugging
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easier. */
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*pxTopOfStack = FP_OFF( pvParameters ); /* AX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xCCCC; /* CX */
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pvParameters ); /* DX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BX */
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxOriginalSP ); /* SP */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BP */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x0123; /* SI */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xDDDD; /* DI */
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/* We need the true data segment. */
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__asm{ MOV DS_Reg, DS };
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pxTopOfStack--;
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*pxTopOfStack = DS_Reg; /* DS */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xEEEE; /* ES */
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/* The AX register is pushed again twice - don't know why. */
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pvParameters ); /* AX */
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pvParameters ); /* AX */
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#ifdef DEBUG_BUILD
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/* The compiler adds space to each ISR stack if building to
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include debug information. Presumably this is used by the
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debugger - we don't need to initialise it to anything just
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make sure it is there. */
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pxTopOfStack--;
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#endif
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/*lint +e950 +e611 +e923 */
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return pxTopOfStack;
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}
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/*-----------------------------------------------------------*/
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Reference in New Issue
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