🚀 go-pugleaf

Malcolm Smith wrote:
> I'm trying to convert this PAS code into a C++ unit but I am not having 
> any luck with the ASM code - it won't compile as is (although the PAS file 
> does).
>
> Can someone please help with the ASM translation.  I know I could just use 
> the .PAS file but I want to learn something along the way.

I'm no expert at ASM, but I'd guess that this would be the C++ translation:

struct TRegisters
{
 DWORD EAX;
 DWORD EBX;
 DWORD ECX;
 DWORD EDX;
};

void __fastcall GetCPUID( DWORD Param, TRegisters &Registers )
{
 asm
 {
  PUSH    EBX                         /* save affected registers */
  PUSH    EDI
  MOV     EDI, Registers
  XOR     EBX, EBX                    /* clear EBX register */
  XOR     ECX, ECX                    /* clear ECX register */
  XOR     EDX, EDX                    /* clear EDX register */
  DB 0x0F, 0xA2                       /* CPUID opcode */
  MOV     [EDI], EAX       /* save EAX register */
  MOV     [EDI+4], EBX       /* save EBX register */
  MOV     [EDI+8], ECX       /* save ECX register */
  MOV     [EDI+12], EDX      /* save EDX register */
  POP     EDI                         /* restore registers */
  POP     EBX
 }
}

Worked for me at any rate.

Jon