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Update Risc-V port to use environment call in place of software interrupt - still very much a work in progress.

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This commit is contained in:
Richard Barry 2018-11-19 06:01:29 +00:00
parent baee711cb6
commit 8cef339aec
3 changed files with 30 additions and 12 deletions
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25
FreeRTOS/Source/portable/GCC/RISC-V-RV32/port.c
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@ -94,6 +94,12 @@ StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t px
x28-31 t3-6 Temporaries Caller
*/
/* To ensure alignment. */
//_RB_ pxTopOfStack--;
//_RB_ pxTopOfStack--;
//_RB_pxTopOfStack--;
/* Numbers correspond to the x register number. */
pxTopOfStack--;
*pxTopOfStack = ( StackType_t ) 31;
pxTopOfStack--;
@ -185,7 +191,7 @@ volatile uint32_t * const pulTimeLow = ( volatile uint32_t * const ) ( configCTR
ullNextTime += ullTimerIncrementsForOneTick;
/* Enable timer interrupt */
__asm volatile( "csrs mie, %0" :: "r"(0x80) );
__asm volatile( "csrs mie, %0" :: "r"(0x80) ); /* 1<<7 for timer interrupt. */
}
/*-----------------------------------------------------------*/
@ -196,19 +202,21 @@ volatile uint32_t * const ulSoftInterrupt = ( uint32_t * ) configCTRL_BASE;
vTaskSwitchContext();
/* Clear software interrupt. */
*( ( uint32_t * ) configCTRL_BASE ) = 0UL;
*( ( uint32_t * ) configCTRL_BASE ) &= 0x08UL;
}
/*-----------------------------------------------------------*/
void Timer_IRQHandler( void )
{
extern void vTaskSwitchContext( void );
/* Reload for the next timer interrupt. */
*pullMachineTimerCompareRegister = ullNextTime;
ullNextTime += ullTimerIncrementsForOneTick;
if( xTaskIncrementTick() != pdFALSE )
{
portYIELD();
vTaskSwitchContext();
}
}
/*-----------------------------------------------------------*/
@ -217,6 +225,17 @@ BaseType_t xPortStartScheduler( void )
{
extern void xPortStartFirstTask( void );
#if( configASSERT_DEFINED == 1 )
{
volatile uint32_t mtvec = 0;
/* Check the least significant two bits of mtvec are 00 - indicating single
vector mode. */
__asm volatile( "csrr %0, mtvec" : "=r"( mtvec ) );
configASSERT( ( mtvec & 0x03UL ) == 0 );
}
#endif
vPortSetupTimerInterrupt();
xPortStartFirstTask();