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179 lines
6.8 KiB
C
179 lines
6.8 KiB
C
/*
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FreeRTOS V6.0.5 - 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 eBook *
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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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/*-----------------------------------------------------------
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* Implementation of functions defined in portable.h for the SH2A port.
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*----------------------------------------------------------*/
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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#include "task.h"
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/* Library includes. */
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#include "string.h"
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/*-----------------------------------------------------------*/
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/* Dimensions the array into which the floating point context is saved.
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Allocate enough space for FPR0 to FPR15, FPUL and FPSCR, each of which is 4
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bytes big. If this number is changed then the 72 in portasm.src also needs
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changing. */
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#define portFLOP_REGISTERS_TO_STORE ( 18 )
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#define portFLOP_STORAGE_SIZE ( portFLOP_REGISTERS_TO_STORE * 4 )
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/* Tasks should start with interrupts enabled, therefore PSW is set with U,I,PM
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flags set and IPL clear. */
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#define portINITIAL_PSW ( ( portSTACK_TYPE ) 0x00130000 )
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#define portINITIAL_FPSW ( ( portSTACK_TYPE ) 0x00000100 )
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/*-----------------------------------------------------------*/
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/*
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*
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*/
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void vPortYield( void );
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/*
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* Function to start the first task executing.
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*/
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void vPortStartFirstTask( void );
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/*-----------------------------------------------------------*/
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/*
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* See header file for description.
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*/
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portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
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{
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/* R0 is not included as it is the stack pointer. */
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*pxTopOfStack = 0xdeadbeef;
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pxTopOfStack--;
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*pxTopOfStack = portINITIAL_PSW;
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) pxCode;
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pxTopOfStack--;
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*pxTopOfStack = 0xffffffff; /* r15. */
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pxTopOfStack--;
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*pxTopOfStack = 0xeeeeeeee;
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pxTopOfStack--;
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*pxTopOfStack = 0xdddddddd;
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pxTopOfStack--;
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*pxTopOfStack = 0xcccccccc;
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pxTopOfStack--;
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*pxTopOfStack = 0xbbbbbbbb;
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pxTopOfStack--;
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*pxTopOfStack = 0xaaaaaaaa;
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pxTopOfStack--;
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*pxTopOfStack = 0x99999999;
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pxTopOfStack--;
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*pxTopOfStack = 0x88888888;
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pxTopOfStack--;
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*pxTopOfStack = 0x77777777;
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pxTopOfStack--;
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*pxTopOfStack = 0x66666666;
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pxTopOfStack--;
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*pxTopOfStack = 0x55555555;
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pxTopOfStack--;
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*pxTopOfStack = 0x44444444;
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pxTopOfStack--;
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*pxTopOfStack = 0x33333333;
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pxTopOfStack--;
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*pxTopOfStack = 0x22222222;
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pxTopOfStack--;
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*pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R1 */
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pxTopOfStack--;
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*pxTopOfStack = portINITIAL_FPSW;
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pxTopOfStack--;
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*pxTopOfStack = 0x12345678; /* Accumulator. */
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pxTopOfStack--;
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*pxTopOfStack = 0x87654321; /* Accumulator. */
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return pxTopOfStack;
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}
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/*-----------------------------------------------------------*/
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portBASE_TYPE xPortStartScheduler( void )
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{
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extern void vApplicationSetupTimerInterrupt( void );
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/* Call an application function to set up the timer that will generate the
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tick interrupt. This way the application can decide which peripheral to
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use. A demo application is provided to show a suitable example. */
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vApplicationSetupTimerInterrupt();
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/* Start the first task. This will only restore the standard registers and
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not the flop registers. This does not really matter though because the only
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flop register that is initialised to a particular value is fpscr, and it is
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only initialised to the current value, which will still be the current value
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when the first task starts executing. */
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//trapa( portSTART_SCHEDULER_TRAP_NO );
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/* Should not get here. */
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return pdFAIL;
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}
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/*-----------------------------------------------------------*/
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void vPortEndScheduler( void )
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{
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/* Not implemented as there is nothing to return to. */
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}
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/*-----------------------------------------------------------*/
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void vPortYield( void )
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{
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}
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/*-----------------------------------------------------------*/
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