📄 portmacro.h
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/*
* MODBUS Library: SAM7X Port
* Copyright (c) 2007 Christian Walter <wolti@sil.at>
* All rights reserved.
*
* $Id: portmacro.h,v 1.1 2007/09/12 10:15:56 wolti Exp $
*/
/*
* FreeRTOS.org V4.4.0 - Copyright (C) 2003-2007 Richard Barry.
*
* This file is part of the FreeRTOS.org distribution.
*
* FreeRTOS.org is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* FreeRTOS.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with FreeRTOS.org; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* A special exception to the GPL can be applied should you wish to distribute
* a combined work that includes FreeRTOS.org, without being obliged to provide
* the source code for any proprietary components. See the licensing section
* of http://www.FreeRTOS.org for full details of how and when the exception
* can be applied.
*
****************************************************************************
* See http://www.FreeRTOS.org for documentation, latest information, license
* and contact details. Please ensure to read the configuration and relevant
* port sections of the online documentation.
*
* Also see http://www.SafeRTOS.com for an IEC 61508 compliant version along
* with commercial development and support options.
***************************************************************************
*/
#ifndef PORTMACRO_H
#define PORTMACRO_H
/* ----------------------- Defines (Type definitions) -----------------------*/
#define portCHAR char
#define portFLOAT float
#define portDOUBLE double
#define portLONG long
#define portSHORT short
#define portSTACK_TYPE unsigned portLONG
#define portBASE_TYPE portLONG
#if( configUSE_16_BIT_TICKS == 1 )
typedef unsigned portSHORT portTickType;
#define portMAX_DELAY ( portTickType ) 0xffff
#else
typedef unsigned portLONG portTickType;
#define portMAX_DELAY ( portTickType ) 0xffffffff
#endif
/* ----------------------- Defines (Architecture specific) ------------------*/
#define portSTACK_GROWTH ( -1 )
#define portTICK_RATE_MS ( ( portTickType ) 1000 / configTICK_RATE_HZ )
#define portBYTE_ALIGNMENT 4
#define portNOP() asm volatile ( "NOP" );
/*
* portRESTORE_CONTEXT, portRESTORE_CONTEXT, portENTER_SWITCHING_ISR
* and portEXIT_SWITCHING_ISR can only be called from ARM mode, but
* are included here for efficiency. An attempt to call one from
* THUMB mode code will result in a compile time error.
*/
#define portRESTORE_CONTEXT() do { \
extern volatile void * volatile pxCurrentTCB; \
extern volatile unsigned portLONG ulCriticalNesting; \
\
/* Set the LR to the task stack. */ \
asm volatile ( \
"LDR R0, =pxCurrentTCB\n\t" \
"LDR R0, [R0]\n\t" \
"LDR LR, [R0]\n\t" \
\
/* The critical nesting depth is the first item on the stack. */ \
/* Load it into the ulCriticalNesting variable. */ \
"LDR R0, =ulCriticalNesting\n\t" \
"LDMFD LR!, {R1}\n\t" \
"STR R1, [R0]\n\t" \
\
/* Get the SPSR from the stack. */ \
"LDMFD LR!, {R0}\n\t" \
"MSR SPSR, R0\n\t" \
\
/* Restore all system mode registers for the task. */ \
"LDMFD LR, {R0-R14}^\n\t" \
"NOP\n\t" \
\
/* Restore the return address. */ \
"LDR LR, [LR, #+60]\n\t" \
\
/* And return - correcting the offset in the LR to obtain the */ \
/* correct address. */ \
"SUBS PC, LR, #4\n\t" \
); \
( void ) ulCriticalNesting; \
( void ) pxCurrentTCB; \
} while( 0 )
#define portSAVE_CONTEXT() do { \
extern volatile void * volatile pxCurrentTCB; \
extern volatile unsigned portLONG ulCriticalNesting; \
\
/* Push R0 as we are going to use the register. */ \
asm volatile ( \
"STMDB SP!, {R0}\n\t" \
\
/* Set R0 to point to the task stack pointer. */ \
"STMDB SP,{SP}^\n\t" \
"NOP\n\t" \
"SUB SP, SP, #4\n\t" \
"LDMIA SP!,{R0}\n\t" \
\
/* Push the return address onto the stack. */ \
"STMDB R0!, {LR}\n\t" \
\
/* Now we have saved LR we can use it instead of R0. */ \
"MOV LR, R0\n\t" \
\
/* Pop R0 so we can save it onto the system mode stack. */ \
"LDMIA SP!, {R0}\n\t" \
\
/* Push all the system mode registers onto the task stack. */ \
"STMDB LR,{R0-LR}^\n\t" \
"NOP\n\t" \
"SUB LR, LR, #60\n\t" \
\
/* Push the SPSR onto the task stack. */ \
"MRS R0, SPSR\n\t" \
"STMDB LR!, {R0}\n\t" \
\
"LDR R0, =ulCriticalNesting\n\t" \
"LDR R0, [R0]\n\t" \
"STMDB LR!, {R0}\n\t" \
\
/* Store the new top of stack for the task. */ \
"LDR R0, =pxCurrentTCB\n\t" \
"LDR R0, [R0]\n\t" \
"STR LR, [R0]\n\t" \
); \
( void ) ulCriticalNesting; \
( void ) pxCurrentTCB; \
} while( 0 )
#define portENTER_SWITCHING_ISR() do { \
/* Save the context of the interrupted task. */ \
portSAVE_CONTEXT(); \
\
/* We don't know the stack requirements for the ISR, so the frame */ \
/* pointer will be set to the top of the task stack, and the stack*/ \
/* pointer left where it is. The IRQ stack will get used for any */ \
/* functions calls made by this ISR. */ \
asm volatile ( "SUB R11, LR, #4" ); \
{
#define portEXIT_SWITCHING_ISR( SwitchRequired ) \
/* If a switch is required then we just need to call */ \
/* vTaskSwitchContext() as the context has already been */ \
/* saved. */ \
if( SwitchRequired ) \
{ \
vTaskSwitchContext(); \
} \
} \
/* Restore the context of which ever task is now the highest */ \
/* priority that is ready to run. */ \
portRESTORE_CONTEXT(); \
} while( 0 )
#define portYIELD() asm volatile ( "SWI" );
/*
* The interrupt management utilities can only be called from ARM mode. When
* THUMB_INTERWORK is defined the utilities are defined as functions in
* portISR.c to ensure a switch to ARM mode. When THUMB_INTERWORK is not
* defined then the utilities are defined as macros here - as per other ports.
*/
#ifdef THUMB_INTERWORK
extern void vPortDisableInterruptsFromThumb( void ) __attribute__ ( ( naked ) );
extern void vPortEnableInterruptsFromThumb( void ) __attribute__ ( ( naked ) );
#define portDISABLE_INTERRUPTS() vPortDisableInterruptsFromThumb()
#define portENABLE_INTERRUPTS() vPortEnableInterruptsFromThumb()
#else
#define portDISABLE_INTERRUPTS() do { \
asm volatile ( \
"STMDB SP!, {R0}\n\t" /* Push R0. */ \
"MRS R0, CPSR\n\t" /* Get CPSR. */ \
"ORR R0, R0, #0xC0\n\t" /* Disable IRQ, FIQ. */ \
"MSR CPSR, R0\n\t" /* Write back modified value. */ \
"LDMIA SP!, {R0}" ); /* Pop R0. */ \
} while( 0 )
#define portENABLE_INTERRUPTS() do { \
asm volatile ( \
"STMDB SP!, {R0}\n\t" /* Push R0. */ \
"MRS R0, CPSR\n\t" /* Get CPSR. */ \
"BIC R0, R0, #0xC0 \n\t" /* Enable IRQ, FIQ. */ \
"MSR CPSR, R0\n\t" /* Write back modified value. */ \
"LDMIA SP!, {R0}" ); /* Pop R0. */ \
} while( 0 )
#endif
extern void vPortEnterCritical( void );
extern void vPortExitCritical( void );
#define portENTER_CRITICAL() vPortEnterCritical();
#define portEXIT_CRITICAL() vPortExitCritical();
/* ----------------------- Defines (Other) ----------------------------------*/
/* Task function macros as described on the FreeRTOS.org WEB site. */
#define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
#define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )
#endif
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