Add definitions for the UEFI ACPI Data Table defined in the UEFI spec and the SMM Communication ACPI Table defined in the PI spec.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11330 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Include/Pi/PiSmmCommunicationAcpiTable.h

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+/** @file
+  PI SMM Communication ACPI Table Definition.
+
+Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials are licensed and made available under 
+the terms and conditions of the BSD License that 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 __PI_SMM_COMMUNICATION_ACPI_TABLE__
+#define __PI_SMM_COMMUNICATION_ACPI_TABLE__
+
+#include <Uefi/UefiAcpiDataTable.h>
+
+#pragma pack(1)
+typedef struct {
+  EFI_ACPI_DATA_TABLE  UefiAcpiDataTable;
+  UINT32               SwSmiNumber;
+  UINT64               BufferPtrAddress;
+} EFI_SMM_COMMUNICATION_ACPI_TABLE;
+#pragma pack()
+
+#endif