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diff --git a/MdePkg/Library/BaseLib/X64/SwitchStack.asm b/MdePkg/Library/BaseLib/X64/SwitchStack.asm
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-;------------------------------------------------------------------------------
-;
-; 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.
-;
-; Module Name:
-;
-; SwitchStack.Asm
-;
-; Abstract:
-;
-;------------------------------------------------------------------------------
-
- .code
-
-;------------------------------------------------------------------------------
-; Routine Description:
-;
-; Routine for switching stacks with 2 parameters
-;
-; Arguments:
-;
-; (rcx) EntryPoint - Entry point with new stack.
-; (rdx) Context1 - Parameter1 for entry point.
-; (r8) Context2 - Parameter2 for entry point.
-; (r9) NewStack - The pointer to new stack.
-;
-; Returns:
-;
-; None
-;
-;------------------------------------------------------------------------------
-InternalSwitchStack PROC
- mov rax, rcx
- mov rcx, rdx
- mov rdx, r8
- ;
- ; Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
- ; in case the callee wishes to spill them.
- ;
- lea rsp, [r9 - 20h]
- call rax
-InternalSwitchStack ENDP
-
- END