MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe: Add support for PCD PcdPteMemoryEncryptionAddressOrMask

This PCD holds the address mask for page table entries when memory
encryption is enabled on AMD processors supporting the Secure Encrypted
Virtualization (SEV) feature.

This module updates the under-4GB page tables configured by the S3-Resume
code in UefiCpuPkg/Universal/Acpi/S3Resume2Pei. The mask is saved at module
start (ScriptExecute.c), and applied when tables are expanded on-demand by
page-faults above 4GB's (SetIdtEntry.c).

CC: Jeff Fan <jeff.fan@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Leo Duran <leo.duran@amd.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>

MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/ScriptExecute.h

@@ -5,6 +5,7 @@
   in the entry point. The functionality is to interpret and restore the S3 boot script 
   
 Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
 
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
@@ -44,6 +45,9 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 #include <Protocol/DxeSmmReadyToLock.h>
 #include <IndustryStandard/Acpi.h>
+
+#define PAGING_1G_ADDRESS_MASK_64  0x000FFFFFC0000000ull
+
 /**
   a ASM function to transfer control to OS.
   
@@ -87,5 +91,6 @@ SetIdtEntry (
 extern UINT32 AsmFixAddress16;
 extern UINT32 AsmJmpAddr32;
 extern BOOLEAN mPage1GSupport;
+extern UINT64 mAddressEncMask;
 
 #endif //_BOOT_SCRIPT_EXECUTOR_H_