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Add memory barrier instructions to Tasking CM4F port.

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This commit is contained in:
Richard Barry 2013-04-16 15:50:17 +00:00
parent 7132e88685
commit 9a15f50b00
2 changed files with 35 additions and 29 deletions
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11
FreeRTOS/Source/portable/Tasking/ARM_CM4F/port.c
View file

@ -83,12 +83,10 @@
/* Constants required to manipulate the NVIC. */
#define portNVIC_SYSTICK_CTRL ( ( volatile unsigned long * ) 0xe000e010 )
#define portNVIC_SYSTICK_LOAD ( ( volatile unsigned long * ) 0xe000e014 )
#define portNVIC_INT_CTRL ( ( volatile unsigned long * ) 0xe000ed04 )
#define portNVIC_SYSPRI2 ( ( volatile unsigned long * ) 0xe000ed20 )
#define portNVIC_SYSTICK_CLK 0x00000004
#define portNVIC_SYSTICK_INT 0x00000002
#define portNVIC_SYSTICK_ENABLE 0x00000001
#define portNVIC_PENDSVSET 0x10000000
#define portNVIC_PENDSV_PRI ( ( ( unsigned long ) configKERNEL_INTERRUPT_PRIORITY ) << 16 )
#define portNVIC_SYSTICK_PRI ( ( ( unsigned long ) configKERNEL_INTERRUPT_PRIORITY ) << 24 )
@ -204,10 +202,15 @@ void vPortEndScheduler( void )
}
/*-----------------------------------------------------------*/
void vPortYieldFromISR( void )
void vPortYield( void )
{
/* Set a PendSV to request a context switch. */
*(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;
/* Barriers are normally not required but do ensure the code is completely
within the specified behaviour for the architecture. */
__DSB();
__ISB();
}
/*-----------------------------------------------------------*/
@ -215,6 +218,8 @@ void vPortEnterCritical( void )
{
portDISABLE_INTERRUPTS();
ulCriticalNesting++;
__DSB();
__ISB();
}
/*-----------------------------------------------------------*/

9
FreeRTOS/Source/portable/Tasking/ARM_CM4F/portmacro.h
View file

@ -116,11 +116,12 @@ extern "C" {
/* Scheduler utilities. */
extern void vPortYieldFromISR( void );
extern void vPortYield( void );
#define portNVIC_INT_CTRL ( ( volatile unsigned long * ) 0xe000ed04 )
#define portNVIC_PENDSVSET 0x10000000
#define portYIELD() vPortYield()
#define portYIELD() vPortYieldFromISR()
#define portEND_SWITCHING_ISR( xSwitchRequired ) if( xSwitchRequired ) vPortYieldFromISR()
#define portEND_SWITCHING_ISR( xSwitchRequired ) if( xSwitchRequired ) *(portNVIC_INT_CTRL) = portNVIC_PENDSVSET
/*-----------------------------------------------------------*/