驱动开发之基本数据结构

根据MSDN的介绍，自己对一些基本结构做一些翻译，帮助自己理解。

驱动对象 DRIVER_OBJECT

typedef struct _DRIVER_OBJECT {
  CSHORT             Type;
  CSHORT             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;
  PDRIVER_INITIALIZE DriverInit;
  PDRIVER_STARTIO    DriverStartIo;
  PDRIVER_UNLOAD     DriverUnload;
  PDRIVER_DISPATCH   MajorFunction[IRP_MJ_MAXIMUM_FUNCTION + 1];
} DRIVER_OBJECT, *PDRIVER_OBJECT;

DeviceObject

指向驱动创建的设备对象的指针。当驱动成功调用IoCreateDevice时，这个成员会自动更新。驱动可以用这个成员和 DEVICE_OBJECT 的 NextDevice 成员去遍历驱动创建的所有设备对象（A driver can use this member and the NextDevice member of DEVICE_OBJECT to step through a list of all the device objects that the driver created.）

DriverExtension

指向驱动扩展的指针。驱动扩展的唯一可访问成员是 DriverExtension->AddDevice，驱动的 DriverEntry 例程存储了驱动的 AddDevice例程。（The only accessible member of the driver extension is DriverExtension->AddDevice, into which a driver's DriverEntry routine stores the driver's AddDevice routine.）

HardwareDatabase

指向路径 \Registry\Machine\Hardware ，在这个注册表路径存储着硬件的配置信息。（Pointer to the \Registry\Machine\Hardware path to the hardware configuration information in the registry.）

FastIoDispatch

指向一个定义驱动的 fast I/O 入口的指针的指针。这个成员仅仅在FSDs个网络传输驱动里面使用。

DriverInit

由 I/O 管理器设置的 DriverEntry 例程的入口点。

DriverStartIo

驱动的 StartIo 例程的入口点。如果有的话，当驱动初始化的时候，DriverEntry将会设置这个值；如果驱动没有 StartIo例程，这个成员就是 NULL。

DriverUnload

驱动的卸载例程的入口点。如果有的话，DriverEntry将在驱动初始化的时候设置这个值；如果驱动没有卸载例程，这个成员就是 NULL。

MajorFunction[IRP_MJ_MAXIMUM_FUNCTION + 1]

由驱动的 DispatchXxx 例程的入口点组成的 Dispatch 表。数组的索引值IRP_MJ_XXX 对应着 IRP 主要函数编码。每个驱动都必须给驱动处理的 IRP_MJ_XXX 请求通过这个数组设置入口点。更多信息可以查看 Writing Dispatch Routines。

设备对象 DEVICE_OBJECT

typedef struct _DEVICE_OBJECT {
  CSHORT                   Type;
  USHORT                   Size;
  LONG                     ReferenceCount;
  struct _DRIVER_OBJECT    *DriverObject;
  struct _DEVICE_OBJECT    *NextDevice;
  struct _DEVICE_OBJECT    *AttachedDevice;
  struct _IRP              *CurrentIrp;
  PIO_TIMER                Timer;
  ULONG                    Flags;
  ULONG                    Characteristics;
  __volatile PVPB          Vpb;
  PVOID                    DeviceExtension;
  DEVICE_TYPE              DeviceType;
  CCHAR                    StackSize;
  union {
    LIST_ENTRY         ListEntry;
    WAIT_CONTEXT_BLOCK Wcb;
  } Queue;
  ULONG                    AlignmentRequirement;
  KDEVICE_QUEUE            DeviceQueue;
  KDPC                     Dpc;
  ULONG                    ActiveThreadCount;
  PSECURITY_DESCRIPTOR     SecurityDescriptor;
  KEVENT                   DeviceLock;
  USHORT                   SectorSize;
  USHORT                   Spare1;
  struct _DEVOBJ_EXTENSION *DeviceObjectExtension;
  PVOID                    Reserved;
} DEVICE_OBJECT, *PDEVICE_OBJECT;

文件对象 DEVICE_OBJECT

typedef struct _FILE_OBJECT {
  CSHORT                            Type;
  CSHORT                            Size;
  PDEVICE_OBJECT                    DeviceObject;
  PVPB                              Vpb;
  PVOID                             FsContext;
  PVOID                             FsContext2;
  PSECTION_OBJECT_POINTERS          SectionObjectPointer;
  PVOID                             PrivateCacheMap;
  NTSTATUS                          FinalStatus;
  struct _FILE_OBJECT               *RelatedFileObject;
  BOOLEAN                           LockOperation;
  BOOLEAN                           DeletePending;
  BOOLEAN                           ReadAccess;
  BOOLEAN                           WriteAccess;
  BOOLEAN                           DeleteAccess;
  BOOLEAN                           SharedRead;
  BOOLEAN                           SharedWrite;
  BOOLEAN                           SharedDelete;
  ULONG                             Flags;
  UNICODE_STRING                    FileName;
  LARGE_INTEGER                     CurrentByteOffset;
  __volatile ULONG                  Waiters;
  __volatile ULONG                  Busy;
  PVOID                             LastLock;
  KEVENT                            Lock;
  KEVENT                            Event;
  __volatile PIO_COMPLETION_CONTEXT CompletionContext;
  KSPIN_LOCK                        IrpListLock;
  LIST_ENTRY                        IrpList;
  __volatile PVOID                  FileObjectExtension;
} FILE_OBJECT, *PFILE_OBJECT;