Intel 64 and IA-32 Architectures Software Developers Manual Volume 2B, Instruction Set Reference, N-Z

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Vol. 2B 4-359

INSTRUCTION SET REFERENCE, N-Z

Operation

IF CS.L ≠ 1 (* Not in 64-Bit Mode *)

THEN

#UD; FI;

IF CPL

≠ 0

THEN #GP(0); FI;

tmp ← GS(BASE);

GS(BASE) ← KERNELGSbase;

KERNELGSbase ← tmp;

Flags Affected

None

Protected Mode Exceptions

#UD If Mode ≠ 64-Bit

Real-Address Mode Exceptions

#UD Instruction not recognized.

Virtual-8086 Mode Exceptions

#UD Instruction not recognized.

Compatibility Mode Exceptions

Same exceptions as in Protected Mode.

64-Bit Mode Exceptions

#GP(0) If CPL ≠ 0.