Mwait.c

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UINTN
EFIAPI
AsmMwait (
  IN      UINTN  RegisterEax,
  IN      UINTN  RegisterEcx
  )
{
  _asm {
    mov     eax, RegisterEax
    mov     ecx, RegisterEcx
    _emit   0x0f              // mwait
    _emit   0x01
    _emit   0xC9
  }
}