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Intel 64 and IA-32 Architectures Software Developers Manual Volume 2A, Instruction Set Reference, A-M

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INSTRUCTION SET REFERENCE, A-M
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)
None.
NOTE
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.