1 files changed, 43 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/SwapBytes64.asm b/Core/MdePkg/Library/BaseLib/Ia32/SwapBytes64.asm
new file mode 100644
index 0000000000..7020753721
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/Ia32/SwapBytes64.asm
@@ -0,0 +1,43 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, 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:
+;
+;   CpuId.Asm
+;
+; Abstract:
+;
+;   AsmCpuid function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .586
+    .model  flat,C
+    .code
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; InternalMathSwapBytes64 (
+;   IN      UINT64                    Operand
+;   );
+;------------------------------------------------------------------------------
+InternalMathSwapBytes64 PROC
+    mov     eax, [esp + 8]              ; eax <- upper 32 bits
+    mov     edx, [esp + 4]              ; edx <- lower 32 bits
+    bswap   eax
+    bswap   edx
+    ret
+InternalMathSwapBytes64 ENDP
+
+    END