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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [CodeWarrior/] [ColdFire_V2/] [port.c] - Blame information for rev 820

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1 572 jeremybenn
/*
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    FreeRTOS V6.1.1 - Copyright (C) 2011 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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/* Kernel includes. */
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#include "FreeRTOS.h"
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#include "task.h"
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#define portINITIAL_FORMAT_VECTOR               ( ( portSTACK_TYPE ) 0x4000 )
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/* Supervisor mode set. */
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#define portINITIAL_STATUS_REGISTER             ( ( portSTACK_TYPE ) 0x2000)
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/* Used to keep track of the number of nested calls to taskENTER_CRITICAL().  This
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will be set to 0 prior to the first task being started. */
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static unsigned long ulCriticalNesting = 0x9999UL;
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#define portSAVE_CONTEXT()                              \
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        lea.l           (-60, %sp), %sp;                \
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        movem.l         %d0-%fp, (%sp);                 \
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        move.l          pxCurrentTCB, %a0;              \
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        move.l          %sp, (%a0);
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#define portRESTORE_CONTEXT()                   \
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        move.l          pxCurrentTCB, %a0;              \
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        move.l          (%a0), %sp;                             \
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        movem.l         (%sp), %d0-%fp;                 \
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        lea.l           %sp@(60), %sp;                  \
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        rte
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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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        *pxTopOfStack = ( portSTACK_TYPE ) pvParameters;
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        pxTopOfStack--;
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        *pxTopOfStack = (portSTACK_TYPE) 0xDEADBEEF;
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        pxTopOfStack--;
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        /* Exception stack frame starts with the return address. */
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        *pxTopOfStack = ( portSTACK_TYPE ) pxCode;
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        pxTopOfStack--;
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        *pxTopOfStack = ( portINITIAL_FORMAT_VECTOR << 16UL ) | ( portINITIAL_STATUS_REGISTER );
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        pxTopOfStack--;
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        *pxTopOfStack = ( portSTACK_TYPE ) 0x0; /*FP*/
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        pxTopOfStack -= 14; /* A5 to D0. */
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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 vPortStartFirstTask( void );
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        ulCriticalNesting = 0UL;
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        /* Configure the interrupts used by this port. */
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        vApplicationSetupInterrupts();
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        /* Start the first task executing. */
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        vPortStartFirstTask();
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        return pdFALSE;
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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 vPortEnterCritical( void )
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{
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        if( ulCriticalNesting == 0UL )
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        {
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                /* Guard against context switches being pended simultaneously with a
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                critical section being entered. */
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                do
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                {
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                        portDISABLE_INTERRUPTS();
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                        if( MCF_INTC0_INTFRCH == 0UL )
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                        {
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                                break;
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                        }
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                        portENABLE_INTERRUPTS();
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                } while( 1 );
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        }
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        ulCriticalNesting++;
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}
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/*-----------------------------------------------------------*/
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void vPortExitCritical( void )
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{
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        ulCriticalNesting--;
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        if( ulCriticalNesting == 0 )
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        {
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                portENABLE_INTERRUPTS();
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        }
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}
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/*-----------------------------------------------------------*/
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void vPortYieldHandler( void )
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{
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unsigned long ulSavedInterruptMask;
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        ulSavedInterruptMask = portSET_INTERRUPT_MASK_FROM_ISR();
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                /* Note this will clear all forced interrupts - this is done for speed. */
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                MCF_INTC0_INTFRCL = 0;
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                vTaskSwitchContext();
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        portCLEAR_INTERRUPT_MASK_FROM_ISR( ulSavedInterruptMask );
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}
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/*-----------------------------------------------------------*/
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