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  UINT32  Signature;

  UINT32  Length;

  UINT8   Revision;

  UINT8   Checksum;

  UINT8   OemId[6];

  UINT64  OemTableId;

  UINT32  OemRevision;

  UINT32  CreatorId;

  UINT32  CreatorRevision;

} EFI_ACPI_DESCRIPTION_HEADER;

///

/// Generic Timer Description Table definition.

///

typedef struct {

  EFI_ACPI_DESCRIPTION_HEADER    Header;

  UINT64                         PhysicalAddress;
  UINT32                         GlobalFlags;
  UINT32                         SecurePL1TimerGSIV;
  UINT32                         SecurePL1TimerFlags;
  UINT32                         NonSecurePL1TimerGSIV;
  UINT32                         NonSecurePL1TimerFlags;
  UINT32                         VirtualTimerGSIV;
  UINT32                         VirtualTimerFlags;
  UINT32                         NonSecurePL2TimerGSIV;
  UINT32                         NonSecurePL2TimerFlags;
} EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE;