VTD status code

enum _PRL_VTD_STATUS_CODE {
  PVSC_DMAR_NOT_FOUND = -5,
  PVSC_DMAR_ERROR = -4,
  PVSC_ACPI_ERROR = -3,
  PVSC_HARDWARE_ERROR = -2,
  PVSC_INTERNAL_ERROR = -1,
  PVSC_NOT_PRESENT = 0,
  PVSC_ENABLED = 1
};