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jeremybenn |
/*
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FreeRTOS V4.1.1 - Copyright (C) 2003-2006 Richard Barry.
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MCF5235 Port - Copyright (C) 2006 Christian Walter.
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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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***************************************************************************
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* *
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* Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
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* *
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* This is a concise, step by step, 'hands on' guide that describes both *
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* general multitasking concepts and FreeRTOS specifics. It presents and *
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* explains numerous examples that are written using the FreeRTOS API. *
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* Full source code for all the examples is provided in an accompanying *
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* .zip file. *
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* *
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***************************************************************************
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***************************************************************************
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Please ensure to read the configuration and relevant port sections of the
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online documentation.
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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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#ifdef __cplusplus
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extern "C" {
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#endif
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/* ------------------------ Data types for Coldfire ----------------------- */
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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 int
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#define portBASE_TYPE int
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#if( USE_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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/* ------------------------ Architecture specifics ------------------------ */
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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 portBYTE_ALIGNMENT 4
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#define portTRAP_YIELD 0 /* Trap 0 */
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#define portIPL_MAX 7 /* Only NMI interrupt 7 allowed. */
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/* ------------------------ FreeRTOS macros for port ---------------------- */
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/*
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* This function must be called when the current state of the active task
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* should be stored. It must be called immediately after exception
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* processing from the CPU, i.e. there exists a Coldfire exception frame at
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* the current position in the stack. The function reserves space on
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* the stack for the CPU registers and other task dependent values (e.g
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* ulCriticalNesting) and updates the top of the stack in the TCB.
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*/
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#define portSAVE_CONTEXT() \
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asm volatile ( /* reserve space for task state. */ \
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"lea.l (-64, %sp), %sp\n\t" \
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/* push data register %d0-%d7/%a0-%a6 on stack. */ \
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"movem.l %d0-%d7/%a0-%a6, (%sp)\n\t" \
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/* push ulCriticalNesting counter on stack. */ \
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"lea.l (60, %sp), %a0\n\t" \
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"move.l ulCriticalNesting, (%a0)\n\t" \
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/* set the new top of the stack in the TCB. */ \
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"move.l pxCurrentTCB, %a0\n\t" \
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"move.l %sp, (%a0)");
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/*.
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* This function restores the current active and continues its execution.
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* It loads the current TCB and restores the processor registers, the
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* task dependent values (e.g ulCriticalNesting). Finally execution
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* is continued by executing an rte instruction.
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*/
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#define portRESTORE_CONTEXT() \
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asm volatile ( "move.l pxCurrentTCB, %sp\n\t" \
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"move.l (%sp), %sp\n\t" \
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/* stack pointer now points to the saved registers. */ \
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"movem.l (%sp), %d0-%d7/%a0-%a6\n\t" \
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/* restore ulCriticalNesting counter from stack. */ \
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"lea.l (%sp, 60), %sp\n\t" \
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"move.l (%sp)+, ulCriticalNesting\n\t" \
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/* stack pointer now points to exception frame. */ \
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"rte\n\t" );
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#define portENTER_CRITICAL() \
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vPortEnterCritical();
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#define portEXIT_CRITICAL() \
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vPortExitCritical();
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#define portSET_IPL( xIPL ) \
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asm_set_ipl( xIPL )
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#define portDISABLE_INTERRUPTS() \
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do { ( void )portSET_IPL( portIPL_MAX ); } while( 0 )
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#define portENABLE_INTERRUPTS() \
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do { ( void )portSET_IPL( 0 ); } while( 0 )
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#define portYIELD() \
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asm volatile ( " trap %0\n\t" : : "i"(portTRAP_YIELD) )
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#define portNOP() \
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asm volatile ( "nop\n\t" )
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#define portENTER_SWITCHING_ISR() \
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asm volatile ( "move.w #0x2700, %sr" ); \
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/* Save the context of the interrupted task. */ \
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portSAVE_CONTEXT( ); \
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{
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#define portEXIT_SWITCHING_ISR( SwitchRequired ) \
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/* If a switch is required we call vTaskSwitchContext(). */ \
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if( SwitchRequired ) \
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{ \
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vTaskSwitchContext( ); \
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} \
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} \
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portRESTORE_CONTEXT( );
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/* ------------------------ Function prototypes --------------------------- */
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void vPortEnterCritical( void );
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void vPortExitCritical( void );
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int asm_set_ipl( unsigned long int uiNewIPL );
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/* ------------------------ Compiler specifics ---------------------------- */
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#define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) \
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void vFunction( void *pvParameters )
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#define portTASK_FUNCTION( vFunction, pvParameters ) \
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void vFunction( void *pvParameters )
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#ifdef __cplusplus
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}
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#endif
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#endif /* PORTMACRO_H */
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