📄 portmacro.h
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/*
FreeRTOS V4.1.1 - Copyright (C) 2003-2005 Richard Barry.
Modification for STR71X/GCC - Copyright (C) 2006 Christian Walter.
This file is part of the FreeRTOS distribution.
FreeRTOS 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 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; 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, 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.
***************************************************************************
*/
#ifndef PORTMACRO_H
#define PORTMACRO_H
/* ----------------------- Defines ------------------------------------------*/
#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) ---------------------------*/
#define portSTACK_GROWTH ( -1 )
#define portTICK_RATE_MS ( ( portTickType ) 1000 / configTICK_RATE_HZ )
#define portBYTE_ALIGNMENT 4
/* ----------------------- Global variables ---------------------------------*/
extern volatile unsigned portLONG ulCriticalNesting;
/*------------------------ Defines (Scheduler) ------------------------------*/
/*
* 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 void * volatile pxCurrentTCB; \
/* Set the LR to the task stack. */ \
asm volatile ( "LDR R0, %0" : : "m" (pxCurrentTCB) ); \
asm volatile ( "LDR LR, [R0]" ); \
\
/* The critical nesting depth is the first item on the stack. */ \
/* Load it into the ulCriticalNesting variable. */ \
asm volatile ( "LDR R0, =ulCriticalNesting" ); \
asm volatile ( "LDMFD LR!, {R1}" ); \
asm volatile ( "STR R1, [R0]" ); \
\
/* Get the SPSR from the stack. */ \
asm volatile ( "LDMFD LR!, {R0}" ); \
asm volatile ( "MSR SPSR, R0" ); \
\
/* Restore all system mode registers for the task. */ \
asm volatile ( "LDMFD LR, {R0-R14}^" ); \
asm volatile ( "NOP" ); \
\
/* Restore the return address. */ \
asm volatile ( "LDR LR, [LR, #+60]" ); \
\
/* And return - correcting the offset in the LR to obtain the */ \
/* correct address. */ \
asm volatile ( "SUBS PC, LR, #4" ); \
} while( 0 );
/*-----------------------------------------------------------*/
#define portSAVE_CONTEXT() \
do { \
extern void * volatile pxCurrentTCB; \
/* Push R0 as we are going to use the register. */ \
asm volatile ( "STMDB SP!, {R0}" ); \
\
/* Set R0 to point to the task stack pointer. */ \
asm volatile ( "STMDB SP,{SP}^" ); \
asm volatile ( "SUB SP, SP, #4" ); \
asm volatile ( "LDMIA SP!,{R0}" ); \
\
/* Push the return address onto the stack. */ \
asm volatile ( "STMDB R0!, {LR}" ); \
\
/* Now we have saved LR we can use it instead of R0. */ \
asm volatile ( "MOV LR, R0" ); \
\
/* Pop R0 so we can save it onto the system mode stack. */ \
asm volatile ( "LDMIA SP!, {R0}" ); \
\
/* Push all the system mode registers onto the task stack. */ \
asm volatile ( "STMDB LR,{R0-LR}^"); \
asm volatile ( "SUB LR, LR, #60" ); \
\
/* Push the SPSR onto the task stack. */ \
asm volatile ( "MRS R0, SPSR" ); \
asm volatile ( "STMDB LR!, {R0}" ); \
\
asm volatile ( "LDR R0, =ulCriticalNesting " ); \
asm volatile ( "LDR R0, [R0]" ); \
asm volatile ( "STMDB LR!, {R0}" ); \
\
/* Store the new top of stack for the task. */ \
asm volatile ( "LDR R0, %0" : : "m" (pxCurrentTCB) ); \
asm volatile ( "STR LR, [R0]" ); \
} while( 0 );
/*-----------------------------------------------------------
* ISR entry and exit macros. These are only required if a task switch
* is required from the ISR.
*----------------------------------------------------------*/
#define portENTER_SWITCHING_ISR() \
/* 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" ); \
do {
#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(); \
} \
} while( 0 ); \
/* Restore the context of which ever task is now the highest */ \
/* priority that is ready to run. */ \
portRESTORE_CONTEXT();
#define portYIELD() asm volatile ( "SWI" );
/* ----------------------- Prototypes ---------------------------------------*/
#define portDISABLE_INTERRUPTS( ) vPortDisableInterrupts()
#define portENABLE_INTERRUPTS( ) vPortEnableInterrupts()
extern void vPortDisableInterrupts( void ) __attribute__ ( ( naked ) );
extern void vPortEnableInterrupts( void ) __attribute__ ( ( naked ) );
extern void vPortEnterCritical( void );
extern void vPortExitCritical( void );
#define portENTER_CRITICAL() vPortEnterCritical();
#define portEXIT_CRITICAL() vPortExitCritical();
#define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) \
void vFunction( void *pvParameters )
#define portTASK_FUNCTION( vFunction, pvParameters ) \
void vFunction( void *pvParameters )
#endif
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