typedef struct _DRIVER_OBJECT
{
     SHORT Type;
     SHORT Size;
     PDEVICE_OBJECT DeviceObject;
     ULONG Flags;
     PVOID DriverStart;
     ULONG DriverSize;
     PVOID DriverSection;
     PDRIVER_EXTENSION DriverExtension;
     UNICODE_STRING DriverName;
     PUNICODE_STRING HardwareDatabase;
     PFAST_IO_DISPATCH FastIoDispatch;
     LONG * DriverInit;
     PVOID DriverStartIo;
     PVOID DriverUnload;
     LONG * MajorFunction[28];
} DRIVER_OBJECT, *PDRIVER_OBJECT;

Windows Vista Kernel Structures