uefiCoreRegisterProtocolNotify

一般通过下面的函数来将image copy到dram中        

Status &＃61; gBS->LoadImage (

                       TRUE,

                       gImageHandle,

                       FullDevicePath,

                       NULL,

                       0,

                       &ImageHandle

                       );

而在dxemain.c中的mBootService 这个数组中已经指定gBS->LoadImage &＃61;&＃61; CoreLoadImage

CoreLoadImage ->CoreLoadImageCommon->CoreInstallProtocolInterfaceNotify

CoreInstallProtocolInterfaceNotify (

  IN OUT EFI_HANDLE     *UserHandle,

  IN EFI_GUID           *Protocol,

  IN EFI_INTERFACE_TYPE InterfaceType,

  IN VOID               *Interface,

  IN BOOLEAN            Notify

  )

{

  if (Notify) {

    CoreNotifyProtocolEntry (ProtEntry);

  }

  Status &＃61; EFI_SUCCESS;





  return Status;

}

在CoreInstallProtocolInterfaceNotify 中会调用用户注册的notify函数.

VOID

CoreNotifyProtocolEntry (

  IN PROTOCOL_ENTRY   *ProtEntry

  )

{

  PROTOCOL_NOTIFY     *ProtNotify;

  LIST_ENTRY          *Link;



  ASSERT_LOCKED (&gProtocolDatabaseLock);



  for (Link&＃61;ProtEntry->Notify.ForwardLink; Link !&＃61; &ProtEntry->Notify; Link&＃61;Link->ForwardLink) {

    ProtNotify &＃61; CR(Link, PROTOCOL_NOTIFY, Link, PROTOCOL_NOTIFY_SIGNATURE);

    CoreSignalEvent (ProtNotify->Event);

  }

}

可见CoreNotifyProtocolEntry 会遍历ProtEntry&＃xff0c;针对每个event调用CoreSignalEvent。也就是说每个protocol 可以注册多个event.

这样当用户再调用CoreRegisterProtocolNotify 时候&＃xff0c;当用户load这个protocol的时候就会用这个Entry->Event 对应的函数.

    // Register for protocol notifactions on this event

    Status &＃61; CoreRegisterProtocolNotify (

              Entry->ProtocolGuid,

              Entry->Event,

              &Entry->Registration

              );



CoreRegisterProtocolNotify (

  IN EFI_GUID       *Protocol,

  IN EFI_EVENT      Event,

  OUT  VOID         **Registration

  )

{

  PROTOCOL_ENTRY    *ProtEntry;

  PROTOCOL_NOTIFY   *ProtNotify;

  EFI_STATUS        Status;



  if ((Protocol &＃61;&＃61; NULL) || (Event &＃61;&＃61; NULL) || (Registration &＃61;&＃61; NULL))  {

    return EFI_INVALID_PARAMETER;

  }



  CoreAcquireProtocolLock ();



  ProtNotify &＃61; NULL;



  //

  // Get the protocol entry to add the notification too

  //



  ProtEntry &＃61; CoreFindProtocolEntry (Protocol, TRUE);

  if (ProtEntry !&＃61; NULL) {



    //

    // Allocate a new notification record

    //

    ProtNotify &＃61; AllocatePool (sizeof(PROTOCOL_NOTIFY));

    if (ProtNotify !&＃61; NULL) {

      ((IEVENT *)Event)->ExFlag |&＃61; EVT_EXFLAG_EVENT_PROTOCOL_NOTIFICATION;

      ProtNotify->Signature &＃61; PROTOCOL_NOTIFY_SIGNATURE;

      ProtNotify->Protocol &＃61; ProtEntry;

      ProtNotify->Event &＃61; Event;

      //

      // start at the begining

      //

      ProtNotify->Position &＃61; &ProtEntry->Protocols;



      InsertTailList (&ProtEntry->Notify, &ProtNotify->Link);

    }

  }



  CoreReleaseProtocolLock ();



 return Status;

}

CoreRegisterProtocolNotify的实现也比较简单&＃xff0c;就是找到protocol的ProtEntry&＃xff0c;然后申请一个PROTOCOL_NOTIFY。最后将ProtNotify 插入到ProtEntry的列表中&＃xff0c;刚好可以和上面调用的函数相对应.