typedef struct _DBGKD_GET_VERSION64
{
     WORD MajorVersion;
     WORD MinorVersion;
     UCHAR ProtocolVersion;
     UCHAR KdSecondaryVersion;
     WORD Flags;
     WORD MachineType;
     UCHAR MaxPacketType;
     UCHAR MaxStateChange;
     UCHAR MaxManipulate;
     UCHAR Simulation;
     WORD Unused[1];
     UINT64 KernBase;
     UINT64 PsLoadedModuleList;
     UINT64 DebuggerDataList;
} DBGKD_GET_VERSION64, *PDBGKD_GET_VERSION64;

Windows Vista Kernel Structures