Intel 253666-024US User Manual

Page 235

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Vol. 2A 3-189

INSTRUCTION SET REFERENCE, A-M

CPUID—CPU Identification

EAX

←

Reserved; (* Information returned for highest basic information leaf. *)

EBX

←

Reserved; (* Information returned for highest basic information leaf. *)

ECX

←

Reserved; (* Information returned for highest basic information leaf. *)

EDX

←

Reserved; (* Information returned for highest basic information leaf. *)

BREAK;

ESAC;

Flags Affected

None.

Exceptions (All Operating Modes)

#UD

If the LOCK prefix is used.
In earlier IA-32 processors that do not support the CPUID

instruction, execution of the instruction results in an invalid
opcode (#UD) exception being generated.

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