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/**
 * RSDP - ACPI 2.0 table RSDP
 */
typedef struct _RSDP {
  unsigned long long  Signature;        ///< RSDP signature "RSD PTR"
  unsigned char  Checksum;          ///< checksum of the first 20 bytes
  unsigned char  OEMID[6];          ///< OEM ID, "LXBIOS"
  unsigned char  Revision;          ///< 0 for APCI 1.0, 2 for ACPI 2.0
  unsigned int  RsdtAddress;      ///< physical address of RSDT
  unsigned int  Length;           ///< total length of RSDP (including extended part)
  unsigned long long  XsdtAddress;      ///< physical address of XSDT
  unsigned char  ExtendedChecksum;  ///< chechsum of whole table
  unsigned char  Reserved[3];       ///< Reserved
} RSDP_HEADER;


/// DESCRIPTION_HEADER - ACPI common table header
typedef struct _DESCRIPTION_HEADER {
  unsigned int  Signature;        ///< ACPI signature (4 ASCII characters)
  unsigned int  Length;           ///< Length of table, in bytes, including header
  unsigned char  Revision;          ///< ACPI Specification minor version #
  unsigned char  Checksum;          ///< To make sum of entire table == 0
  unsigned char  OEMID[6];          ///< OEM identification
  unsigned char  OEMTableID[8];     ///< OEM table identification
  unsigned int  OEMRevision;      ///< OEM revision number
  unsigned int  CreatorID;        ///< ASL compiler vendor ID
  unsigned int  CreatorRevision;  ///< ASL compiler revision number
} DESCRIPTION_HEADER;

void* ACPI_LocateTable (IN unsigned int Signature);
void  ACPI_SetTableChecksum (IN void* TablePtr);
unsigned char ACPI_GetTableChecksum (IN void* TablePtr);
unsigned char GetByteSum (IN void* pData, IN unsigned int Length);