X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=MdePkg%2FInclude%2FProtocol%2FServiceBinding.h;h=5a1896392a662f61eb0b164326c71a4af3b28bb7;hb=34860f7a069641fb9e14077c01605215aae68a9b;hp=57ce92f14269238b2cda387e5875e833699a9eb7;hpb=878ddf1fc3540a715f63594ed22b6929e881afb4;p=mirror_edk2.git

diff --git a/MdePkg/Include/Protocol/ServiceBinding.h b/MdePkg/Include/Protocol/ServiceBinding.h
index 57ce92f142..5a1896392a 100644
--- a/MdePkg/Include/Protocol/ServiceBinding.h
+++ b/MdePkg/Include/Protocol/ServiceBinding.h
@@ -1,5 +1,11 @@
-/** @file
-  Copyright (c) 2006, Intel Corporation                                                         
+/** @file  
+  UEFI Service Binding Protocol is defined in UEFI specification.
+
+  The file defines the generic Service Binding Protocol functions.
+  It provides services that are required to create and destroy child 
+  handles that support a given set of protocols.
+
+  Copyright (c) 2006 - 2008, Intel Corporation                                                         
   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        
@@ -8,27 +14,28 @@
   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
 
-  Module Name:  ServiceBinding.h
-
 **/
 
 #ifndef __EFI_SERVICE_BINDING_H__
 #define __EFI_SERVICE_BINDING_H__
 
-//
-// Forward reference for pure ANSI compatability
-//
+///
+/// Forward reference for pure ANSI compatability
+///
 typedef struct _EFI_SERVICE_BINDING_PROTOCOL EFI_SERVICE_BINDING_PROTOCOL;
 
 /**
-  Creates a child handle with a set of I/O services.
+  Creates a child handle and installs a protocol.
+  The CreateChild() function installs a protocol on ChildHandle. 
+  If ChildHandle is a pointer to NULL, then a new handle is created and returned in ChildHandle. 
+  If ChildHandle is not a pointer to NULL, then the protocol installs on the existing ChildHandle.
 
-  @param  This        Protocol instance pointer.
-  @param  ChildHandle Pointer to the handle of the child to create.  If it is NULL,
-                      then a new handle is created.  If it is not NULL, then the
-                      I/O services are added to the existing child handle.
+  @param  This        Pointer to the EFI_SERVICE_BINDING_PROTOCOL instance.
+  @param  ChildHandle Pointer to the handle of the child to create. If it is NULL,
+                      then a new handle is created. If it is a pointer to an existing UEFI handle, 
+                      then the protocol is added to the existing UEFI handle.
 
-  @retval EFI_SUCCES            The child handle was created with the I/O services
+  @retval EFI_SUCCES            The protocol was added to ChildHandle.
   @retval EFI_INVALID_PARAMETER ChildHandle is NULL.
   @retval EFI_OUT_OF_RESOURCES  There are not enough resources availabe to create
                                 the child
@@ -37,35 +44,46 @@ typedef struct _EFI_SERVICE_BINDING_PROTOCOL EFI_SERVICE_BINDING_PROTOCOL;
 **/
 typedef
 EFI_STATUS
-(EFIAPI *EFI_SERVICE_BINDING_CREATE_CHILD) (
+(EFIAPI *EFI_SERVICE_BINDING_CREATE_CHILD)(
   IN     EFI_SERVICE_BINDING_PROTOCOL  *This,
   IN OUT EFI_HANDLE                    *ChildHandle
-  )
-;
+  );
 
 /**
-  Destroys a child handle with a set of I/O services.
+  Destroys a child handle with a protocol installed on it.
+  The DestroyChild() function does the opposite of CreateChild(). It removes a protocol 
+  that was installed by CreateChild() from ChildHandle. If the removed protocol is the 
+  last protocol on ChildHandle, then ChildHandle is destroyed.
 
-  @param  This        Protocol instance pointer.
+  @param  This        Pointer to the EFI_SERVICE_BINDING_PROTOCOL instance.
   @param  ChildHandle Handle of the child to destroy
 
-  @retval EFI_SUCCES            The I/O services were removed from the child handle
-  @retval EFI_UNSUPPORTED       The child handle does not support the I/O services
-                                that are being removed.
-  @retval EFI_INVALID_PARAMETER Child handle is not a valid EFI Handle.
-  @retval EFI_ACCESS_DENIED     The child handle could not be destroyed because its
-                                I/O services are being used.
+  @retval EFI_SUCCES            The protocol was removed from ChildHandle.
+  @retval EFI_UNSUPPORTED       ChildHandle does not support the protocol that is being removed.
+  @retval EFI_INVALID_PARAMETER Child handle is not a valid UEFI Handle.
+  @retval EFI_ACCESS_DENIED     The protocol could not be removed from the ChildHandle
+                                because its services are being used.
   @retval other                 The child handle was not destroyed
 
 **/
 typedef
 EFI_STATUS
-(EFIAPI *EFI_SERVICE_BINDING_DESTROY_CHILD) (
+(EFIAPI *EFI_SERVICE_BINDING_DESTROY_CHILD)(
   IN EFI_SERVICE_BINDING_PROTOCOL          *This,
   IN EFI_HANDLE                            ChildHandle
-  )
-;
+  );
 
+///
+/// The EFI_SERVICE_BINDING_PROTOCOL provides member functions to create and destroy 
+/// child handles. A driver is responsible for adding protocols to the child handle 
+/// in CreateChild() and removing protocols in DestroyChild(). It is also required 
+/// that the CreateChild() function opens the parent protocol BY_CHILD_CONTROLLER 
+/// to establish the parent-child relationship, and closes the protocol in DestroyChild().
+/// The pseudo code for CreateChild() and DestroyChild() is provided to specify the 
+/// required behavior, not to specify the required implementation. Each consumer of 
+/// a software protocol is responsible for calling CreateChild() when it requires the 
+/// protocol and calling DestroyChild() when it is finished with that protocol.
+///
 struct _EFI_SERVICE_BINDING_PROTOCOL {
   EFI_SERVICE_BINDING_CREATE_CHILD         CreateChild;
   EFI_SERVICE_BINDING_DESTROY_CHILD        DestroyChild;