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diff --git a/UnixPkg/Library/UnixBaseLib/X86DisablePaging64.c b/UnixPkg/Library/UnixBaseLib/X86DisablePaging64.c
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+++ b/UnixPkg/Library/UnixBaseLib/X86DisablePaging64.c
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+/** @file
+ IA-32/x64 AsmDisablePaging64()
+
+ Copyright (c) 2006 - 2008, 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
+ 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.
+
+**/
+
+
+
+
+#include "BaseLibInternals.h"
+
+/**
+ Disables the 64-bit paging mode on the CPU.
+
+ Disables the 64-bit paging mode on the CPU and returns to 32-bit protected
+ mode. This function assumes the current execution mode is 64-paging mode.
+ This function is only available on x64. After the 64-bit paging mode is
+ disabled, control is transferred to the function specified by EntryPoint
+ using the new stack specified by NewStack and passing in the parameters
+ specified by Context1 and Context2. Context1 and Context2 are optional and
+ may be 0. The function EntryPoint must never return.
+
+ If the current execution mode is not 64-bit paged mode, then ASSERT().
+ If EntryPoint is 0, then ASSERT().
+ If NewStack is 0, then ASSERT().
+
+ @param Cs The 16-bit selector to load in the CS before EntryPoint
+ is called. The descriptor in the GDT that this selector
+ references must be setup for 32-bit protected mode.
+ @param EntryPoint The 64-bit virtual address of the function to call with
+ the new stack after paging is disabled.
+ @param Context1 The 64-bit virtual address of the context to pass into
+ the EntryPoint function as the first parameter after
+ paging is disabled.
+ @param Context2 The 64-bit virtual address of the context to pass into
+ the EntryPoint function as the second parameter after
+ paging is disabled.
+ @param NewStack The 64-bit virtual address of the new stack to use for
+ the EntryPoint function after paging is disabled.
+
+**/
+VOID
+EFIAPI
+AsmDisablePaging64 (
+ IN UINT16 Cs,
+ IN UINT32 EntryPoint,
+ IN UINT32 Context1, OPTIONAL
+ IN UINT32 Context2, OPTIONAL
+ IN UINT32 NewStack
+ )
+{
+ ASSERT (EntryPoint != 0);
+ ASSERT (NewStack != 0);
+ InternalX86DisablePaging64 (Cs, EntryPoint, Context1, Context2, NewStack);
+}