void vTrapSysCallYield()

in GCC/TriCore_38xa/port.c [468:514]

• 23 lines of code
• 2 McCabe index (conditional complexity)

void vTrapSysCallYield( int iTrapIdentification )
{
uint32_t *pxUpperCSA = NULL;
uint32_t xUpperCSA = 0UL;

extern volatile uint32_t *pxCurrentTCB;

	switch( iTrapIdentification )
	{
		case portSYSCALL_TASK_YIELD:
			/* Save the context of a task.
			The upper context is automatically saved when entering a trap or interrupt.
			Need to save the lower context as well and copy the PCXI CSA ID into
			pxCurrentTCB->pxTopOfStack. Only Lower Context CSA IDs may be saved to the
			TCB of a task.

			Call vTaskSwitchContext to select the next task, note that this changes the
			value of pxCurrentTCB so that it needs to be reloaded.

			Call vPortSetMPURegisterSetOne to change the MPU mapping for the task
			that has just been switched in.

			Load the context of the task.
			Need to restore the lower context by loading the CSA from
			pxCurrentTCB->pxTopOfStack into PCXI (effectively changing the call stack).
			In the Interrupt handler post-amble, RSLCX will restore the lower context
			of the task. RFE will restore the upper context of the task, jump to the
			return address and restore the previous state of interrupts being
			enabled/disabled. */
			_disable();
			_dsync();
			xUpperCSA = __MFCR( $PCXI );
			pxUpperCSA = portCSA_TO_ADDRESS( xUpperCSA );
			*pxCurrentTCB = pxUpperCSA[ 0 ];
			vTaskSwitchContext();
			pxUpperCSA[ 0 ] = *pxCurrentTCB;
			SRBs[CPU_ID]->B.TRIG0 = 0; //ATEN
			// CPU_SRC0.bits.SETR = 0;
			_isync();
			break;

		default:
			/* Unimplemented trap called. */
			configASSERT( ( ( volatile void * ) NULL ) );
			break;
	}
}