CpuIdEx.c

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UINT32
EFIAPI
AsmCpuidEx (
  IN      UINT32  Index,
  IN      UINT32  SubIndex,
  OUT     UINT32  *RegisterEax   OPTIONAL,
  OUT     UINT32  *RegisterEbx   OPTIONAL,
  OUT     UINT32  *RegisterEcx   OPTIONAL,
  OUT     UINT32  *RegisterEdx   OPTIONAL
  )
{
  _asm {
    mov     eax, Index
    mov     ecx, SubIndex
    cpuid
    push    ecx
    mov     ecx, RegisterEax
    jecxz   SkipEax
    mov     [ecx], eax
SkipEax:
    mov     ecx, RegisterEbx
    jecxz   SkipEbx
    mov     [ecx], ebx
SkipEbx:
    pop     eax
    mov     ecx, RegisterEcx
    jecxz   SkipEcx
    mov     [ecx], eax
SkipEcx:
    mov     ecx, RegisterEdx
    jecxz   SkipEdx
    mov     [ecx], edx
SkipEdx:
    mov     eax, Index
  }
}