const
ID_BIT = $200000; // EFLAGS ID bit
type
TCPUID = array[1..4] of Longint;
TVendor = array [0..11] of char;

function IsCPUID_Available : Boolean; register;
asm
PUSHFD {direct access to flags no possible, only via stack}
POP EAX {flags to EAX}
MOV EDX,EAX {save current flags}
XOR EAX,ID_BIT {not ID bit}
PUSH EAX {onto stack}
POPFD {from stack to flags, with not ID bit}
PUSHFD {back to stack}
POP EAX {get back to EAX}
XOR EAX,EDX {check if ID bit affected}
JZ @exit {no, CPUID not availavle}
MOV AL,True {Result=True}
@exit:
end;

function GetCPUID : TCPUID; assembler; register;
asm
PUSH EBX {Save affected register}
PUSH EDI
MOV EDI,EAX {@Resukt}
MOV EAX,1
DW $A20F {CPUID Command}
STOSD {CPUID[1]}
MOV EAX,EBX
STOSD {CPUID[2]}
MOV EAX,ECX
STOSD {CPUID[3]}
MOV EAX,EDX
STOSD {CPUID[4]}
POP EDI {Restore registers}
POP EBX
end;

function GetCPUVendor : TVendor; assembler; register;
asm
PUSH EBX {Save affected register}
PUSH EDI
MOV EDI,EAX {@Result (TVendor)}
MOV EAX,0
DW $A20F {CPUID Command}
MOV EAX,EBX
XCHG EBX,ECX {save ECX result}
MOV ECX,4
@1:
STOSB
SHR EAX,8
LOOP @1
MOV EAX,EDX
MOV ECX,4
@2:
STOSB
SHR EAX,8
LOOP @2
MOV EAX,EBX
MOV ECX,4
@3:
STOSB
SHR EAX,8
LOOP @3
POP EDI {Restore registers}
POP EBX
end;


procedure TForm1.Button1Click(Sender: TObject);
var
CPUID : TCPUID;
I : Integer;
S : TVendor;
begin
for I := Low(CPUID) to High(CPUID) do CPUID[I] := -1;
if IsCPUID_Available then begin
CPUID := GetCPUID;
Memo1.Lines.Add('CPUID[1] = ' + IntToHex(CPUID[1],8));
Memo1.Lines.Add('CPUID[2] = ' + IntToHex(CPUID[2],8));
Memo1.Lines.Add('CPUID[3] = ' + IntToHex(CPUID[3],8));
Memo1.Lines.Add( 'CPUID[4] = ' + IntToHex(CPUID[4],8));
Memo1.Lines.Add('PValue = '+ IntToStr(CPUID[1] shr 12 and 3));
Memo1.Lines.Add( 'FValue = '+IntToStr(CPUID[1] shr 8 and $f));
Memo1.Lines.Add( 'MValue = '+IntToStr(CPUID[1] shr 4 and $f));
Memo1.Lines.Add( 'SValue = '+IntToStr(CPUID[1] and $f));
S := GetCPUVendor;
Memo1.Lines.Add( 'Vendor: ' + S); end
else begin
Memo1.Lines.Add( 'CPUID not available');
end;
end;