struct DBGKD_GET_SET_BUS_DATA

typedef struct _DBGKD_GET_SET_BUS_DATA
{
     ULONG BusDataType;
     ULONG BusNumber;
     ULONG SlotNumber;
     ULONG Offset;
     ULONG Length;
} DBGKD_GET_SET_BUS_DATA, *PDBGKD_GET_SET_BUS_DATA;

Windows Vista Kernel Structures