/** @file
  Support functions for managing protocol.

Copyright (c) 2006 - 2008, Intel Corporation. <BR>
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#ifndef  _HAND_H_
#define  _HAND_H_


//
// IHANDLE - contains a list of protocol handles
//

#define EFI_HANDLE_SIGNATURE            EFI_SIGNATURE_32('h','n','d','l')
typedef struct {
  UINTN               Signature;
  LIST_ENTRY          AllHandles;     // All handles list of IHANDLE
  LIST_ENTRY          Protocols;      // List of PROTOCOL_INTERFACE's for this handle
  UINTN               LocateRequest;  // 
  UINT64              Key;            // The Handle Database Key value when this handle was last created or modified
} IHANDLE;

#define ASSERT_IS_HANDLE(a)  ASSERT((a)->Signature == EFI_HANDLE_SIGNATURE)


//
// PROTOCOL_ENTRY - each different protocol has 1 entry in the protocol 
// database.  Each handler that supports this protocol is listed, along
// with a list of registered notifies.
//

#define PROTOCOL_ENTRY_SIGNATURE        EFI_SIGNATURE_32('p','r','t','e')
typedef struct {
  UINTN               Signature;
  LIST_ENTRY          AllEntries;             // All entries
  EFI_GUID            ProtocolID;             // ID of the protocol
  LIST_ENTRY          Protocols;              // All protocol interfaces
  LIST_ENTRY          Notify;                 // Registerd notification handlers
} PROTOCOL_ENTRY;

//
// PROTOCOL_INTERFACE - each protocol installed on a handle is tracked
// with a protocol interface structure
//

#define PROTOCOL_INTERFACE_SIGNATURE  EFI_SIGNATURE_32('p','i','f','c')
typedef struct {
  UINTN                       Signature;
  EFI_HANDLE                  Handle;     // Back pointer
  LIST_ENTRY                  Link;       // Link on IHANDLE.Protocols
  LIST_ENTRY                  ByProtocol; // Link on PROTOCOL_ENTRY.Protocols
  PROTOCOL_ENTRY              *Protocol;  // The protocol ID
  VOID                        *Interface; // The interface value
                                          
  LIST_ENTRY                  OpenList;       // OPEN_PROTOCOL_DATA list.
  UINTN                       OpenListCount;  
  
  EFI_HANDLE                  ControllerHandle;

} PROTOCOL_INTERFACE;

#define OPEN_PROTOCOL_DATA_SIGNATURE  EFI_SIGNATURE_32('p','o','d','l')

typedef struct {
  UINTN                       Signature;
  LIST_ENTRY                  Link;

  EFI_HANDLE                  AgentHandle;
  EFI_HANDLE                  ControllerHandle;
  UINT32                      Attributes;
  UINT32                      OpenCount;
} OPEN_PROTOCOL_DATA;


//
// PROTOCOL_NOTIFY - used for each register notification for a protocol
//

#define PROTOCOL_NOTIFY_SIGNATURE       EFI_SIGNATURE_32('p','r','t','n')
typedef struct {
  UINTN               Signature;
  PROTOCOL_ENTRY      *Protocol;
  LIST_ENTRY          Link;                   // All notifications for this protocol
  EFI_EVENT           Event;                  // Event to notify
  LIST_ENTRY          *Position;              // Last position notified
} PROTOCOL_NOTIFY;

//
// Internal prototypes
//



/**
  Finds the protocol entry for the requested protocol.
  The gProtocolDatabaseLock must be owned

  @param  Protocol               The ID of the protocol 
  @param  Create                 Create a new entry if not found 

  @return Protocol entry

**/
PROTOCOL_ENTRY  *
CoreFindProtocolEntry (
  IN EFI_GUID   *Protocol,
  IN BOOLEAN    Create
  );


/**
  Signal event for every protocol in protocol entry.

  @param  ProtEntry              Protocol entry

**/
VOID
CoreNotifyProtocolEntry (
  IN PROTOCOL_ENTRY   *ProtEntry
  );


/**
  Finds the protocol instance for the requested handle and protocol.
  Note: This function doesn't do parameters checking, it's caller's responsibility
  to pass in valid parameters.

  @param  Handle                 The handle to search the protocol on 
  @param  Protocol               GUID of the protocol 
  @param  Interface              The interface for the protocol being searched 

  @return Protocol instance (NULL: Not found)

**/
PROTOCOL_INTERFACE *
CoreFindProtocolInterface (
  IN IHANDLE        *Handle,
  IN EFI_GUID       *Protocol,
  IN VOID           *Interface
  );


/**
  Removes Protocol from the protocol list (but not the handle list).

  @param  Handle                 The handle to remove protocol on. 
  @param  Protocol               GUID of the protocol to be moved 
  @param  Interface              The interface of the protocol 

  @return Protocol Entry

**/
PROTOCOL_INTERFACE *
CoreRemoveInterfaceFromProtocol (
  IN IHANDLE        *Handle,
  IN EFI_GUID       *Protocol,
  IN VOID           *Interface
  );


/**
  Removes all the events in the protocol database that match Event.

  @param  Event                  The event to search for in the protocol 
                                 database. 

  @return EFI_SUCCESS when done searching the entire database.

**/
EFI_STATUS
CoreUnregisterProtocolNotify (
  IN EFI_EVENT      Event
  );


/**
  Attempts to disconnect all drivers that are using the protocol interface being queried.
  If failed, reconnect all drivers disconnected.
  Note: This function doesn't do parameters checking, it's caller's responsibility
  to pass in valid parameters.

  @param  UserHandle             The handle on which the protocol is installed 
  @param  Prot                   The protocol to disconnect drivers from 

  @retval EFI_SUCCESS            Drivers using the protocol interface are all 
                                 disconnected 
  @retval EFI_ACCESS_DENIED      Failed to disconnect one or all of the drivers

**/
EFI_STATUS
CoreDisconnectControllersUsingProtocolInterface (
  IN EFI_HANDLE           UserHandle,
  IN PROTOCOL_INTERFACE   *Prot
  );


/**
  Acquire lock on gProtocolDatabaseLock.

**/
VOID
CoreAcquireProtocolLock (
  VOID
  );


/**
  Release lock on gProtocolDatabaseLock.

**/
VOID
CoreReleaseProtocolLock (
  VOID
  );


/**
  Check whether a handle is a valid EFI_HANDLE

  @param  UserHandle             The handle to check 

  @retval EFI_INVALID_PARAMETER  The handle is NULL or not a valid EFI_HANDLE. 
  @retval EFI_SUCCESS            The handle is valid EFI_HANDLE.

**/
EFI_STATUS
CoreValidateHandle (
  IN  EFI_HANDLE                UserHandle
  );

//
// Externs
//

extern EFI_LOCK         gProtocolDatabaseLock;
extern LIST_ENTRY       gHandleList;
extern UINT64           gHandleDatabaseKey;

#endif