Interrupt Flag

Interrupt Flag

IF (Interrupt Flag) is a system flag bit in the x86 architecture's FLAGS register, which determines whether or not the CPU will handle maskable hardware interrupts.

The bit, which is bit 9 of the FLAGS register, may be set or cleared by programs with sufficient privileges, as usually determined by the Operating System. If the flag is set to 1, maskable hardware interrupts will be handled. If cleared (set to 0), such interrupts will be ignored. IF does not affect the handling of non-maskable interrupts or software interrupts generated by the INT instruction.

Read more about Interrupt Flag:  Setting and Clearing, Privilege Level, CLI, STI

Other articles related to "interrupt flag, interrupts, flag":

Interrupt Flag - STI
... The STI instruction enables interrupts by setting the IF flag ... instruction is that, unlike CLI which has an immediate effect, interrupts are not actually enabled until after the instruction immediately following the STI ... CLI instruction immediately after an STI instruction means that interrupts are never recognized ...

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