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Add FreeRTOS-Plus directory.
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Richard Barry
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6798 changed files with 134949 additions and 19 deletions
306
FreeRTOS/Source/portable/Renesas/SH2A_FPU/port.c
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306
FreeRTOS/Source/portable/Renesas/SH2A_FPU/port.c
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/*
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FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.
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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. FreeRTOS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or 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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***************************************************************************
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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, training, latest information,
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license and 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.
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Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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the code with commercial support, indemnification, and middleware, under
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the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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provide a safety engineered and independently SIL3 certified version under
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the SafeRTOS brand: http://www.SafeRTOS.com.
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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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/* The SR assigned to a newly created task. The only important thing in this
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value is for all interrupts to be enabled. */
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#define portINITIAL_SR ( 0UL )
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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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/*-----------------------------------------------------------*/
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/*
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* The TRAPA handler used to force a context switch.
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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 - defined in portasm.src.
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*/
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extern void vPortStartFirstTask( void );
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/*
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* Obtains the current GBR value - defined in portasm.src.
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*/
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extern unsigned long ulPortGetGBR( 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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/* Mark the end of the stack - used for debugging only and can be removed. */
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*pxTopOfStack = 0x11111111UL;
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pxTopOfStack--;
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*pxTopOfStack = 0x22222222UL;
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pxTopOfStack--;
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*pxTopOfStack = 0x33333333UL;
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pxTopOfStack--;
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/* SR. */
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*pxTopOfStack = portINITIAL_SR;
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pxTopOfStack--;
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/* PC. */
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*pxTopOfStack = ( unsigned long ) pxCode;
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pxTopOfStack--;
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/* PR. */
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*pxTopOfStack = 15;
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pxTopOfStack--;
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/* 14. */
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*pxTopOfStack = 14;
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pxTopOfStack--;
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/* R13. */
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*pxTopOfStack = 13;
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pxTopOfStack--;
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/* R12. */
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*pxTopOfStack = 12;
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pxTopOfStack--;
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/* R11. */
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*pxTopOfStack = 11;
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pxTopOfStack--;
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/* R10. */
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*pxTopOfStack = 10;
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pxTopOfStack--;
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/* R9. */
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*pxTopOfStack = 9;
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pxTopOfStack--;
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/* R8. */
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*pxTopOfStack = 8;
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pxTopOfStack--;
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/* R7. */
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*pxTopOfStack = 7;
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pxTopOfStack--;
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/* R6. */
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*pxTopOfStack = 6;
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pxTopOfStack--;
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/* R5. */
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*pxTopOfStack = 5;
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pxTopOfStack--;
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/* R4. */
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*pxTopOfStack = ( unsigned long ) pvParameters;
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pxTopOfStack--;
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/* R3. */
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*pxTopOfStack = 3;
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pxTopOfStack--;
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/* R2. */
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*pxTopOfStack = 2;
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pxTopOfStack--;
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/* R1. */
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*pxTopOfStack = 1;
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pxTopOfStack--;
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/* R0 */
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*pxTopOfStack = 0;
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pxTopOfStack--;
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/* MACL. */
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*pxTopOfStack = 16;
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pxTopOfStack--;
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/* MACH. */
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*pxTopOfStack = 17;
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pxTopOfStack--;
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/* GBR. */
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*pxTopOfStack = ulPortGetGBR();
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/* GBR = global base register.
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VBR = vector base register.
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TBR = jump table base register.
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R15 is the stack pointer. */
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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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long lInterruptMask;
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/* Ensure the yield trap runs at the same priority as the other interrupts
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that can cause a context switch. */
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lInterruptMask = get_imask();
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/* taskYIELD() can only be called from a task, not an interrupt, so the
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current interrupt mask can only be 0 or portKERNEL_INTERRUPT_PRIORITY and
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the mask can be set without risk of accidentally lowering the mask value. */
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set_imask( portKERNEL_INTERRUPT_PRIORITY );
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trapa( portYIELD_TRAP_NO );
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/* Restore the interrupt mask to whatever it was previously (when the
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function was entered). */
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set_imask( ( int ) lInterruptMask );
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}
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/*-----------------------------------------------------------*/
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portBASE_TYPE xPortUsesFloatingPoint( xTaskHandle xTask )
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{
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unsigned long *pulFlopBuffer;
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portBASE_TYPE xReturn;
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extern void * volatile pxCurrentTCB;
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/* This function tells the kernel that the task referenced by xTask is
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going to use the floating point registers and therefore requires the
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floating point registers saved as part of its context. */
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/* Passing NULL as xTask is used to indicate that the calling task is the
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subject task - so pxCurrentTCB is the task handle. */
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if( xTask == NULL )
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{
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xTask = ( xTaskHandle ) pxCurrentTCB;
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}
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/* Allocate a buffer large enough to hold all the flop registers. */
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pulFlopBuffer = ( unsigned long * ) pvPortMalloc( portFLOP_STORAGE_SIZE );
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if( pulFlopBuffer != NULL )
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{
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/* Start with the registers in a benign state. */
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memset( ( void * ) pulFlopBuffer, 0x00, portFLOP_STORAGE_SIZE );
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/* The first thing to get saved in the buffer is the FPSCR value -
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initialise this to the current FPSCR value. */
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*pulFlopBuffer = get_fpscr();
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/* Use the task tag to point to the flop buffer. Pass pointer to just
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above the buffer because the flop save routine uses a pre-decrement. */
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vTaskSetApplicationTaskTag( xTask, ( void * ) ( pulFlopBuffer + portFLOP_REGISTERS_TO_STORE ) );
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xReturn = pdPASS;
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}
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else
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{
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xReturn = pdFAIL;
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}
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return xReturn;
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}
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/*-----------------------------------------------------------*/
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