_disable instructs the processor to clear the interrupt flag. On x86 systems, this function generates the Clear Interrupt Flag (cli) instruction. On IPF systems, this function generates the Reset System Mask (rsm) instruction with an argument that clears the interrupt control flag.
This function is only available in kernel mode. If used in user mode, a Privileged Instruction exception is thrown at run time.
On IPF platforms, this routine is only available as an intrinsic.