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Richard Barry
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/*
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FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* If you are: *
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* *
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* + New to FreeRTOS, *
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* + Wanting to learn FreeRTOS or multitasking in general quickly *
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* + Looking for basic training, *
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* + Wanting to improve your FreeRTOS skills and productivity *
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* *
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* then take a look at the FreeRTOS books - available as PDF or paperback *
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* *
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* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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* http://www.FreeRTOS.org/Documentation *
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* *
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* A pdf reference manual is also available. Both are usually delivered *
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* to your inbox within 20 minutes to two hours when purchased between 8am *
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* and 8pm GMT (although please allow up to 24 hours in case of *
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* exceptional circumstances). 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 exception to the GPL is included to allow you to distribute
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a combined work that includes FreeRTOS without being obliged to provide the
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source code for proprietary components outside of the FreeRTOS kernel.
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FreeRTOS 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. You should have received a copy of the GNU General Public
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License and the FreeRTOS license exception along with FreeRTOS; if not it
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can be viewed here: http://www.freertos.org/a00114.html and also obtained
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by writing to Richard Barry, contact details for whom are available on the
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FreeRTOS WEB site.
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1 tab == 4 spaces!
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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 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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#define portSWITCH_CONTEXT() \
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asm { mov ax, seg pxCurrentTCB } \
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asm { mov ds, ax } \
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asm { les bx, pxCurrentTCB } /* Save the stack pointer into the TCB. */ \
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asm { mov es:0x2[ bx ], ss } \
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asm { mov es:[ bx ], sp } \
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asm { call far ptr vTaskSwitchContext } /* Perform the switch. */ \
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asm { mov ax, seg pxCurrentTCB } /* Restore the stack pointer from the TCB. */ \
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asm { mov ds, ax } \
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asm { les bx, dword ptr pxCurrentTCB } \
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asm { mov ss, es:[ bx + 2 ] } \
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asm { mov sp, es:[ bx ] }
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#define portFIRST_CONTEXT() \
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__asm { mov ax, seg pxCurrentTCB } \
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__asm { mov ds, ax } \
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__asm { les bx, dword ptr pxCurrentTCB } \
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__asm { mov ss, es:[ bx + 2 ] } \
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__asm { mov sp, es:[ 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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@ -0,0 +1,146 @@
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/*
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FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* If you are: *
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* *
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* + New to FreeRTOS, *
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* + Wanting to learn FreeRTOS or multitasking in general quickly *
|
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* + Looking for basic training, *
|
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* + Wanting to improve your FreeRTOS skills and productivity *
|
||||
* *
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* then take a look at the FreeRTOS books - available as PDF or paperback *
|
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* *
|
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* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
|
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* http://www.FreeRTOS.org/Documentation *
|
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* *
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* A pdf reference manual is also available. Both are usually delivered *
|
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* to your inbox within 20 minutes to two hours when purchased between 8am *
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* and 8pm GMT (although please allow up to 24 hours in case of *
|
||||
* exceptional circumstances). 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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|
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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 exception 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
|
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||||
more details. You should have received a copy of the GNU General Public
|
||||
License and the FreeRTOS license exception along with FreeRTOS; if not it
|
||||
can be viewed here: http://www.freertos.org/a00114.html and also obtained
|
||||
by writing to Richard Barry, contact details for whom are available on the
|
||||
FreeRTOS WEB site.
|
||||
|
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1 tab == 4 spaces!
|
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|
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http://www.FreeRTOS.org - Documentation, latest information, license and
|
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contact details.
|
||||
|
||||
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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/*
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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 V2.6.1
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+ Move usPortCheckFreeStackSpace() to tasks.c.
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*/
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#include <dos.h>
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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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portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
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{
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portSTACK_TYPE DS_Reg = 0;
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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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function call with parameters preamble. */
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*pxTopOfStack = FP_SEG( pvParameters );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pvParameters );
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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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/* Next the status register and interrupt return address. */
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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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/* 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 = ( portSTACK_TYPE ) 0xAAAA; /* AX */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0xBBBB; /* BX */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0xCCCC; /* CX */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0xDDDD; /* DX */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0xEEEE; /* ES */
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pxTopOfStack--;
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/* We need the true data segment. */
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__asm{ MOV DS_Reg, DS };
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*pxTopOfStack = DS_Reg; /* DS */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0x0123; /* SI */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0xDDDD; /* DI */
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) 0xBBBB; /* BP */
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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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