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Changes to core code and port layer:

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+ Add configASSERT() into ARM Cortex-M ports to check the number of priority
      bit settings.
    + Clear the 'control' register before starting ARM Cortex-M4F ports in case
      the FPU is used before the scheduler is started.  This just saves a few
      bytes on the main stack as it prevents space being left for a later save
      of FPU registers.
    + Added xSemaphoreGetMutexHolderFromISR().
    + Corrected use of portNVIC_PENDSVSET to portNVIC_PENDSVSET_BIT in MPU ports.
This commit is contained in:
Richard Barry 2016-08-16 11:38:58 +00:00
parent bdbf347c22
commit 75ffac21d7
32 changed files with 1196 additions and 215 deletions
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24
FreeRTOS/Source/portable/GCC/ARM_CM7/r0p1/port.c
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@ -285,11 +285,17 @@ void vPortSVCHandler( void )
static void prvPortStartFirstTask( void )
{
/* Start the first task. This also clears the bit that indicates the FPU is
in use in case the FPU was used before the scheduler was started - which
would otherwise result in the unnecessary leaving of space in the SVC stack
for lazy saving of FPU registers. */
__asm volatile(
" ldr r0, =0xE000ED08 \n" /* Use the NVIC offset register to locate the stack. */
" ldr r0, [r0] \n"
" ldr r0, [r0] \n"
" msr msp, r0 \n" /* Set the msp back to the start of the stack. */
" mov r0, #0 \n" /* Clear the bit that indicates the FPU is in use, see comment above. */
" msr control, r0 \n"
" cpsie i \n" /* Globally enable interrupts. */
" cpsie f \n"
" dsb \n"
@ -342,6 +348,24 @@ BaseType_t xPortStartScheduler( void )
ucMaxPriorityValue <<= ( uint8_t ) 0x01;
}
#ifdef __NVIC_PRIO_BITS
{
/* Check the CMSIS configuration that defines the number of
priority bits matches the number of priority bits actually queried
from the hardware. */
configASSERT( ( portMAX_PRIGROUP_BITS - ulMaxPRIGROUPValue ) == __NVIC_PRIO_BITS );
}
#endif
#ifdef configPRIO_BITS
{
/* Check the FreeRTOS configuration that defines the number of
priority bits matches the number of priority bits actually queried
from the hardware. */
configASSERT( ( portMAX_PRIGROUP_BITS - ulMaxPRIGROUPValue ) == configPRIO_BITS );
}
#endif
/* Shift the priority group value back to its position within the AIRCR
register. */
ulMaxPRIGROUPValue <<= portPRIGROUP_SHIFT;