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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.〔(【引用サイトリンク】format = PDF )〕
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.
== Setting and clearing ==
The flag may be set or cleared using the CLI (Clear Interrupts), STI (Set Interrupts) and POPF (Pop Flags) instructions.
CLI clears IF (sets to 0), while STI sets IF to 1. POPF pops 16 bits off the stack into the FLAGS register, which means IF will be set or cleared based on the ninth bit on the top of the stack.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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