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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.