From 709f55c0239dc59e2b16ffe442436e2d46dd4102 Mon Sep 17 00:00:00 2001
From: rsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Tue, 1 Sep 2009 07:58:24 +0000
Subject: [PATCH] Add into MdePkg definitions for EFI SMM Communication
 Protocol as defined in the PI 1.2 specification.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9218 6f19259b-4bc3-4df7-8a09-765794883524
---
 MdePkg/Include/Protocol/SmmCommunication.h | 79 ++++++++++++++++++++++
 MdePkg/MdePkg.dec                          |  3 +
 2 files changed, 82 insertions(+)
 create mode 100644 MdePkg/Include/Protocol/SmmCommunication.h

diff --git a/MdePkg/Include/Protocol/SmmCommunication.h b/MdePkg/Include/Protocol/SmmCommunication.h
new file mode 100644
index 0000000000..f2cbecf9c8
--- /dev/null
+++ b/MdePkg/Include/Protocol/SmmCommunication.h
@@ -0,0 +1,79 @@
+/** @file
+  EFI SMM Communication Protocol as defined in the PI 1.2 specification.
+
+  This protocol provides a means of communicating between drivers outside of SMM and SMI 
+  handlers inside of SMM.  
+
+  Copyright (c) 2009, 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        
+  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 _SMM_COMMUNICATION_H_
+#define _SMM_COMMUNICATION_H_
+
+#define EFI_SMM_COMMUNICATION_PROTOCOL_GUID \
+  { \
+    0xc68ed8e2, 0x9dc6, 0x4cbd, { 0x9d, 0x94, 0xdb, 0x65, 0xac, 0xc5, 0xc3, 0x32 } \
+  }
+
+///
+/// To avoid confusion in interpreting frames, the communication buffer should always 
+/// begin with EFI_SMM_COMMUNICATE_HEADER
+///
+typedef struct {
+  ///
+  /// Allows for disambiguation of the message format.
+  ///
+  EFI_GUID  HeaderGuid;
+  ///
+  /// Describes the size of Data (in bytes) and does not include the size of the header.
+  ///
+  UINTN     MessageLength;
+  ///
+  /// Designates an array of bytes that is MessageLength in size.
+  ///
+  UINT8     Data[1];
+} EFI_SMM_COMMUNICATE_HEADER;
+
+typedef struct _EFI_SMM_COMMUNICATION_PROTOCOL  EFI_SMM_COMMUNICATION_PROTOCOL;
+
+/**
+  Communicates with a registered handler.
+  
+  This function provides a service to send and receive messages from a registered UEFI service.
+
+  @param[in] This                The EFI_SMM_COMMUNICATION_PROTOCOL instance.
+  @param[in] CommBuffer          A pointer to the buffer to convey into SMRAM.
+  @param[in] CommSize            The size of the data buffer being passed in.On exit, the size of data
+                                 being returned. Zero if the handler does not wish to reply with any data.
+
+  @retval EFI_SUCCESS            The message was successfully posted.
+  @retval EFI_INVALID_PARAMETER  The CommBuffer was NULL.
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EFI_SMM_COMMUNICATE)(
+  IN CONST EFI_SMM_COMMUNICATION_PROTOCOL  *This,
+  IN OUT VOID                              *CommBuffer,
+  IN OUT UINTN                             *CommSize
+  );
+
+///
+/// EFI SMM Communication Protocol provides runtime services for communicating
+/// between DXE drivers and a registered SMI handler.
+///
+struct _EFI_SMM_COMMUNICATION_PROTOCOL {
+  EFI_SMM_COMMUNICATE  Communicate;
+};
+
+extern EFI_GUID gEfiSmmCommunicationProtocolGuid;
+
+#endif
+
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 835fa989dd..c3e77cb79c 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -596,6 +596,9 @@
   ## Include/Protocol/DxeSmmReadyToLock.h
   gEfiDxeSmmReadyToLockProtocolGuid = { 0x60ff8964, 0xe906, 0x41d0, { 0xaf, 0xed, 0xf2, 0x41, 0xe9, 0x74, 0xe0, 0x8e }}
 
+  ## Include/Protocol/SmmCommunication.h
+  gEfiSmmCommunicationProtocolGuid  = { 0xc68ed8e2, 0x9dc6, 0x4cbd, { 0x9d, 0x94, 0xdb, 0x65, 0xac, 0xc5, 0xc3, 0x32 }}
+
   #
   # Protocols defined in UEFI2.1/UEFI2.0/EFI1.1
   #