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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [CodeWarrior/] [HCS12/] [portmacro.h] - 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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#ifndef PORTMACRO_H
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#define PORTMACRO_H
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/*-----------------------------------------------------------
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 * Port specific definitions.
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 *
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 * The settings in this file configure FreeRTOS correctly for the
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 * given hardware and compiler.
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 *
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 * These settings should not be altered.
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 *-----------------------------------------------------------
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 */
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/* Type definitions. */
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#define portCHAR                char
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#define portFLOAT               float
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#define portDOUBLE              double
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#define portLONG                long
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#define portSHORT               short
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#define portSTACK_TYPE  unsigned portCHAR
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#define portBASE_TYPE   char
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#if( configUSE_16_BIT_TICKS == 1 )
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        typedef unsigned portSHORT portTickType;
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        #define portMAX_DELAY ( portTickType ) 0xffff
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#else
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        typedef unsigned portLONG portTickType;
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        #define portMAX_DELAY ( portTickType ) 0xffffffff
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#endif
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/*-----------------------------------------------------------*/
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/* Hardware specifics. */
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#define portBYTE_ALIGNMENT                      1
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#define portSTACK_GROWTH                        ( -1 )
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#define portTICK_RATE_MS                        ( ( portTickType ) 1000 / configTICK_RATE_HZ )          
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#define portYIELD()                                     __asm( "swi" );
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#define portNOP()                                       __asm( "nop" );
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/*-----------------------------------------------------------*/
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/* Critical section handling. */
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#define portENABLE_INTERRUPTS()                         __asm( "cli" )  
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#define portDISABLE_INTERRUPTS()                        __asm( "sei" )
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/*
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 * Disable interrupts before incrementing the count of critical section nesting.
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 * The nesting count is maintained so we know when interrupts should be
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 * re-enabled.  Once interrupts are disabled the nesting count can be accessed
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 * directly.  Each task maintains its own nesting count.
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 */
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#define portENTER_CRITICAL()                                                                    \
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{                                                                                                                               \
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        extern volatile unsigned portBASE_TYPE uxCriticalNesting;       \
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                                                                                                                                \
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        portDISABLE_INTERRUPTS();                                                                       \
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        uxCriticalNesting++;                                                                            \
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}
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/*
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 * Interrupts are disabled so we can access the nesting count directly.  If the
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 * nesting is found to be 0 (no nesting) then we are leaving the critical
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 * section and interrupts can be re-enabled.
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 */
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#define  portEXIT_CRITICAL()                                                                    \
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{                                                                                                                               \
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        extern volatile unsigned portBASE_TYPE uxCriticalNesting;       \
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                                                                                                                                \
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        uxCriticalNesting--;                                                                            \
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        if( uxCriticalNesting == 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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/* Task utilities. */
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/*
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 * These macros are very simple as the processor automatically saves and
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 * restores its registers as interrupts are entered and exited.  In
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 * addition to the (automatically stacked) registers we also stack the
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 * critical nesting count.  Each task maintains its own critical nesting
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 * count as it is legitimate for a task to yield from within a critical
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 * section.  If the banked memory model is being used then the PPAGE
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 * register is also stored as part of the tasks context.
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 */
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#ifdef BANKED_MODEL
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        /*
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         * Load the stack pointer for the task, then pull the critical nesting
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         * count and PPAGE register from the stack.  The remains of the
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         * context are restored by the RTI instruction.
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         */
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        #define portRESTORE_CONTEXT()                                                                   \
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        {                                                                                                                               \
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                extern volatile void * pxCurrentTCB;                                            \
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                extern volatile unsigned portBASE_TYPE uxCriticalNesting;       \
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                                                                                                                                        \
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                __asm( "ldx pxCurrentTCB" );                                                            \
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                __asm( "lds 0, x" );                                                                            \
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                __asm( "pula" );                                                                                        \
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                __asm( "staa uxCriticalNesting" );                                                      \
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                __asm( "pula" );                                                                                        \
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                __asm( "staa 0x30" ); /* 0x30 = PPAGE */                                        \
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        }
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        /*
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         * By the time this macro is called the processor has already stacked the
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         * registers.  Simply stack the nesting count and PPAGE value, then save
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         * the task stack pointer.
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         */
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        #define portSAVE_CONTEXT()                                                                              \
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        {                                                                                                                               \
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                extern volatile void * pxCurrentTCB;                                            \
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                extern volatile unsigned portBASE_TYPE uxCriticalNesting;       \
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                                                                                                                                        \
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                __asm( "ldaa 0x30" );  /* 0x30 = PPAGE */                                       \
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                __asm( "psha" );                                                                                        \
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                __asm( "ldaa uxCriticalNesting" );                                                      \
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                __asm( "psha" );                                                                                        \
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                __asm( "ldx pxCurrentTCB" );                                                            \
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                __asm( "sts 0, x" );                                                                            \
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        }
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#else
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        /*
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         * These macros are as per the BANKED versions above, but without saving
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         * and restoring the PPAGE register.
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         */
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        #define portRESTORE_CONTEXT()                                                                   \
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        {                                                                                                                               \
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                extern volatile void * pxCurrentTCB;                                            \
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                extern volatile unsigned portBASE_TYPE uxCriticalNesting;       \
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                                                                                                                                        \
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                __asm( "ldx pxCurrentTCB" );                                                            \
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                __asm( "lds 0, x" );                                                                            \
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                __asm( "pula" );                                                                                        \
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                __asm( "staa uxCriticalNesting" );                                                      \
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        }
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        #define portSAVE_CONTEXT()                                                                              \
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        {                                                                                                                               \
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                extern volatile void * pxCurrentTCB;                                            \
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                extern volatile unsigned portBASE_TYPE uxCriticalNesting;       \
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                                                                                                                                        \
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                __asm( "ldaa uxCriticalNesting" );                                                      \
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                __asm( "psha" );                                                                                        \
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                __asm( "ldx pxCurrentTCB" );                                                            \
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                __asm( "sts 0, x" );                                                                            \
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        }
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#endif
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/*
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 * Utility macro to call macros above in correct order in order to perform a
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 * task switch from within a standard ISR.  This macro can only be used if
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 * the ISR does not use any local (stack) variables.  If the ISR uses stack
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 * variables portYIELD() should be used in it's place.
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 */
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#define portTASK_SWITCH_FROM_ISR()                                                              \
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        portSAVE_CONTEXT();                                                                                     \
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        vTaskSwitchContext();                                                                           \
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        portRESTORE_CONTEXT();
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/* Task function macros as described on the FreeRTOS.org WEB site. */
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#define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
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#define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )
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#endif /* PORTMACRO_H */
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