Fast interrupt request (Fast Interrupt Request, FIQ) In ARM, FIQ mode is one of the privileged modes, and also belongs to the category of abnormal mode. It is used for high-speed data transmission or channel processing, and enters when a fast interrupt request (FIQ) is triggered.
There is a big difference between FIQ and IRQ (external interrupt mode). FIQ mode must be processed as soon as possible and leave this mode after processing; IRQ mode can be interrupted by FIQ mode, but IRQ cannot interrupt FIQ mode; in order to make FIQ mode respond faster, FIQ mode has more shadow registers. FIQ mode must disable interrupts; if an interrupt routine must re-enable interrupts, IRQ mode should be used instead of FIQ mode.
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