Operation
IF PE = 0
THEN
IF 0;
ELSE
IF VM = 0 (* Running in protected Mode *)
THEN
IF IOPL = 3
THEN IF 0;
ELSE IF CPL ≤ IOPL
THEN IF 0;
ELSE #GP(0);
FI;
FI;
ELSE (* Running in Virtual-8086 mode *)
IF IOPL = 3
THEN IF
ELSE #GP(0);
FI;
FI;
FI;
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