24531904_j

IN—Input from Port ( 続き )
操作
IF ((PE = 1) AND ((VM = 1) OR (CPL > IOPL)))
THEN (* Protected mode or virtual-8086 mode with CPL > IOPL *)
IF (CFLG.io AND Any I/O Permission Bit for I/O port being accessed = 1)
THEN #GP(0);
FI;
ELSE ( * Real-address mode or protected mode with CPL ≤ IOPL *)
(* or virtual-8086 mode with all I/O permission bits for I/O port cleared *)
FI;
IF (Itanium_System_Environment THEN
SRC_VA = IOBase | (Port{15:2}