How to disable interrupts for one instruction?

问题

Is there any other way to disable interrupts for the duration of only one instruction in x86 than using the CLI instruction?

回答1:

Yes, loading SS with a MOV will inhibit external interrupts for the next instruction. This is what the instruction set reference says:

Loading the SS register with a MOV instruction inhibits all interrupts until after the execution of the next instruction. This operation allows a stack pointer to be loaded into the ESP register with the next instruction (MOV ESP, stack-pointer value) before an interrupt occurs.

回答2:

This code snippet does the trick:

pushf
pop  ax
and  ax, FDFFh
push ax
popf               ;This disables interrupts, You didn't use "CLI"
; Here IF is clear
sti

来源：https://stackoverflow.com/questions/33330911/how-to-disable-interrupts-for-one-instruction