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Diffstat (limited to 'openpicc/os/core/ARM7_AT91SAM7S/portmacro.h')
| -rw-r--r-- | openpicc/os/core/ARM7_AT91SAM7S/portmacro.h | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/openpicc/os/core/ARM7_AT91SAM7S/portmacro.h b/openpicc/os/core/ARM7_AT91SAM7S/portmacro.h new file mode 100644 index 0000000..6b25ec5 --- /dev/null +++ b/openpicc/os/core/ARM7_AT91SAM7S/portmacro.h @@ -0,0 +1,266 @@ +/* + FreeRTOS.org V4.2.1 - 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. + *************************************************************************** +*/ + +/* + Changes from V3.2.3 + + + Modified portENTER_SWITCHING_ISR() to allow use with GCC V4.0.1. + + Changes from V3.2.4 + + + Removed the use of the %0 parameter within the assembler macros and + replaced them with hard coded registers. This will ensure the + assembler does not select the link register as the temp register as + was occasionally happening previously. + + + The assembler statements are now included in a single asm block rather + than each line having its own asm block. +*/ + +#ifndef PORTMACRO_H +#define PORTMACRO_H + +/*----------------------------------------------------------- + * Port specific definitions. + * + * The settings in this file configure FreeRTOS correctly for the + * given hardware and compiler. + * + * These settings should not be altered. + *----------------------------------------------------------- + */ + +/* 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 +/*-----------------------------------------------------------*/ + +/* Architecture specifics. */ +#define portSTACK_GROWTH ( -1 ) +#define portTICK_RATE_MS ( ( portTickType ) 1000 / configTICK_RATE_HZ ) +#define portBYTE_ALIGNMENT 4 +#define portNOP() asm volatile ( "NOP" ); +/*-----------------------------------------------------------*/ + + +/* Scheduler utilities. */ + +/* + * 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() \ +{ \ +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; \ +} +/*-----------------------------------------------------------*/ + +#define portSAVE_CONTEXT() \ +{ \ +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; \ +} + + +/*----------------------------------------------------------- + * 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" ); \ + { + +#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(); + +#define portYIELD() asm volatile ( "SWI" ); +/*-----------------------------------------------------------*/ + + +/* Critical section management. */ + +/* + * 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() \ + 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. */ + +#define portENABLE_INTERRUPTS() \ + 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. */ + +#endif /* THUMB_INTERWORK */ + +extern void vPortEnterCritical (void); +extern void vPortExitCritical (void); + +#define portENTER_CRITICAL() vPortEnterCritical(); +#define portEXIT_CRITICAL() vPortExitCritical(); +/*-----------------------------------------------------------*/ + +/* 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 /* PORTMACRO_H */ |