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Performance optimisation.

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This commit is contained in:
Richard Barry 2008-03-23 15:53:37 +00:00
parent b53d20dfd2
commit a8d03f24e3
2 changed files with 62 additions and 96 deletions
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50
Source/portable/IAR/ARM_CM3/port.c
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@ -25,11 +25,11 @@
***************************************************************************
Please ensure to read the configuration and relevant port sections of the
Please ensure to read the configuration and relevant port sections of the
online documentation.
+++ http://www.FreeRTOS.org +++
Documentation, latest information, license and contact details.
Documentation, latest information, license and contact details.
+++ http://www.SafeRTOS.com +++
A version that is certified for use in safety critical systems.
@ -60,7 +60,6 @@
#define portNVIC_SYSTICK_LOAD ( ( volatile unsigned portLONG *) 0xe000e014 )
#define portNVIC_INT_CTRL ( ( volatile unsigned portLONG *) 0xe000ed04 )
#define portNVIC_SYSPRI2 ( ( volatile unsigned portLONG *) 0xe000ed20 )
#define portNVIC_SYSPRI1 ( ( volatile unsigned portLONG *) 0xe000ed1c )
#define portNVIC_SYSTICK_CLK 0x00000004
#define portNVIC_SYSTICK_INT 0x00000002
#define portNVIC_SYSTICK_ENABLE 0x00000001
@ -88,16 +87,14 @@ unsigned portBASE_TYPE uxCriticalNesting = 0xaaaaaaaa;
static void prvSetupTimerInterrupt( void );
/*
* Set the MSP/PSP to a known value.
* Exception handlers.
*/
extern void vSetMSP( unsigned long ulValue );
extern void vSetPSP( unsigned long ulValue );
void xPortSysTickHandler( void );
/*
* Utilities called from the assembler code.
* Start first task is a separate function so it can be tested in isolation.
*/
void vPortSwitchContext( void );
void vPortIncrementTick( void );
extern void vPortStartFirstTask( unsigned portLONG ulValue );
/*-----------------------------------------------------------*/
@ -112,7 +109,7 @@ portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) pxCode; /* PC */
pxTopOfStack--;
*pxTopOfStack = 0xfffffffd; /* LR */
*pxTopOfStack = 0; /* LR */
pxTopOfStack -= 5; /* R12, R3, R2 and R1. */
*pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R0 */
pxTopOfStack -= 9; /* R11, R10, R9, R8, R7, R6, R5 and R4. */
@ -136,12 +133,7 @@ portBASE_TYPE xPortStartScheduler( void )
prvSetupTimerInterrupt();
/* Start the first task. */
vSetPSP( 0 );
vSetMSP( *((unsigned portLONG *) 0 ) );
*(portNVIC_INT_CTRL) |= portNVIC_PENDSVSET;
/* Enable interrupts */
portENABLE_INTERRUPTS();
vPortStartFirstTask( *((unsigned portLONG *) 0 ) );
/* Should not get here! */
return 0;
@ -183,6 +175,16 @@ void vPortExitCritical( void )
}
/*-----------------------------------------------------------*/
void xPortSysTickHandler( void )
{
vTaskIncrementTick();
/* If using preemption, also force a context switch. */
#if configUSE_PREEMPTION == 1
*(portNVIC_INT_CTRL) |= portNVIC_PENDSVSET;
#endif
}
/*-----------------------------------------------------------*/
/*
* Setup the systick timer to generate the tick interrupts at the required
@ -196,19 +198,3 @@ void prvSetupTimerInterrupt( void )
}
/*-----------------------------------------------------------*/
void vPortSwitchContext( void )
{
vPortSetInterruptMask();
vTaskSwitchContext();
vPortClearInterruptMask();
}
/*-----------------------------------------------------------*/
void vPortIncrementTick( void )
{
vPortSetInterruptMask();
vTaskIncrementTick();
vPortClearInterruptMask();
}