RealView Compiler Reference Guide
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__enable_fiq
This intrinsic enables FIQ interrupts.
void __enable_fiq(void)
The __enable_fiq intrinsic can only be executed in privileged modes, that is, in non user modes. In User mode this intrinsic does not change the interrupt flags in the CPSR.
CPSR
__disable_fiq.
__disable_fiq