User threads aren't supposed to be able to adjust the interrupt flag (IF). A few
apps for instance DOSBox would just use the popf instruction and disable the
flag, expecting the change to be ignored.
Quote from the Intel manual:
"The interrupt flag (IF) is altered only when executing at a level at least as
privileged as the IOPL. If a POPF/POPFD instruction is executed with
insufficient privilege, an exception does not occur, but the privileged bits
do not change."
fix#14711
Change-Id: I0519312c1151a1dd76541f60283c6c210a5b21a6
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4046
Reviewed-by: Adrien Destugues <[email protected]>
Jérôme Duval
bc5570ae60