len0rd/FreeRTOS-Kernel
1
0
Fork 0
mirror of https://github.com/FreeRTOS/FreeRTOS-Kernel.git synced 2026-01-20 08:40:35 -05:00
Code Issues Projects Releases Packages Wiki Activity

Some efficiency improvements in Risc-V port.

Browse source
This commit is contained in:
Richard Barry 2018-11-28 19:35:40 +00:00
parent dc99300fa9
commit e85ea96f78
2 changed files with 100 additions and 74 deletions
Download patch file Download diff file Expand all files Collapse all files

26
FreeRTOS/Source/portable/GCC/RISC-V-RV32/port.c
View file

@ -49,9 +49,10 @@ static void prvTaskExitError( void );
/*-----------------------------------------------------------*/
/* Used to program the machine timer compare register. */
static uint64_t ullNextTime = 0ULL;
static const uint64_t ullTimerIncrementsForOneTick = ( uint64_t ) ( configCPU_CLOCK_HZ / configTICK_RATE_HZ );
static volatile uint64_t * const pullMachineTimerCompareRegister = ( volatile uint64_t * const ) ( configCLINT_BASE_ADDRESS + 0x4000 );
uint64_t ullNextTime = 0ULL;
const uint64_t *pullNextTime = &ullNextTime;
const uint32_t ulTimerIncrementsForOneTick = ( uint32_t ) ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ); /* Assumes increment won't go over 32-bits. */
volatile uint64_t * const pullMachineTimerCompareRegister = ( volatile uint64_t * const ) ( configCLINT_BASE_ADDRESS + 0x4000 );
/*-----------------------------------------------------------*/
@ -187,11 +188,11 @@ volatile uint32_t * const pulTimeLow = ( volatile uint32_t * const ) ( configCLI
ullNextTime = ( uint64_t ) ulCurrentTimeHigh;
ullNextTime <<= 32ULL;
ullNextTime |= ( uint64_t ) ulCurrentTimeLow;
ullNextTime += ullTimerIncrementsForOneTick;
ullNextTime += ( uint64_t ) ulTimerIncrementsForOneTick;
*pullMachineTimerCompareRegister = ullNextTime;
/* Prepare the time to use after the next tick interrupt. */
ullNextTime += ullTimerIncrementsForOneTick;
ullNextTime += ( uint64_t ) ulTimerIncrementsForOneTick;
/* Enable timer interrupt */
__asm volatile( "csrs mie, %0" :: "r"(0x80) ); /* 1<<7 for timer interrupt. */
@ -209,21 +210,6 @@ volatile uint32_t * const ulSoftInterrupt = ( uint32_t * ) configCLINT_BASE_ADDR
}
/*-----------------------------------------------------------*/
void Timer_IRQHandler( void )
{
extern void vTaskSwitchContext( void );
/* Reload for the next timer interrupt. */
*pullMachineTimerCompareRegister = ullNextTime;
ullNextTime += ullTimerIncrementsForOneTick;
if( xTaskIncrementTick() != pdFALSE )
{
vTaskSwitchContext();
}
}
/*-----------------------------------------------------------*/
BaseType_t xPortStartScheduler( void )
{
extern void xPortStartFirstTask( void );