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First version under SVN is V4.0.1
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Richard Barry
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Source/portable/CodeWarrior/HCS12/portmacro.h
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Source/portable/CodeWarrior/HCS12/portmacro.h
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/*
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FreeRTOS V4.0.1 - Copyright (C) 2003-2006 Richard Barry.
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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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FreeRTOS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FreeRTOS; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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A special exception to the GPL can be applied should you wish to distribute
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a combined work that includes FreeRTOS, without being obliged to provide
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the source code for any proprietary components. See the licensing section
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of http://www.FreeRTOS.org for full details of how and when the exception
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can be applied.
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***************************************************************************
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See http://www.FreeRTOS.org for documentation, latest information, license
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and contact details. Please ensure to read the configuration and relevant
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port sections of the online documentation.
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***************************************************************************
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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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#define inline
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#endif /* PORTMACRO_H */
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