Operation

switch (EAX)
case 0:
EAX hv;(* hv=1 for the Pentium processor *)
(* hv is the highest input value that is understood by CPUID. *)

EBX Vendor identification string;
EDX Vendor identification string;
ECX Vendor identification string;
break;

case 1:
EAX[3:0] Stepping ID;
EAX[7:4] Model;
EAX[11:8] Family;
EAX[31:12] Reserved;

EBX reserved; (* 0 *)
ECX reserved; (* 0 *)
EBX feature flags;
break;

default: (* EAX > hv *)
EAX reserved, undefined;
EBX reserved, undefined;
ECX reserved, undefined;
EDX reserved, undefined;
break;
end-of-switch

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