cli/sti

The clear interrupts and set interrupts instructions dis- or enable hardware interrupts.

Instruction	Encoding	Semantics	Cycles
cli	00 110 001	disable interrupts	1
sti	00 111 001	enable interrupts	1

Note that software interrupts (using int) are unaffected by cli. The sequence cli; int 42 would still cause an interrupt. Note furthermore that returning from the interrupt using iret would re-enable interrupts.