1 files changed, 43 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/SwapBytes64.S b/MdePkg/Library/BaseLib/Ia32/SwapBytes64.S
new file mode 100644
index 0000000000..313f4164fa
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/SwapBytes64.S
@@ -0,0 +1,43 @@
+//
+// Include common header file for this module.
+//
+#include "CommonHeader.h"
+
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006, Intel Corporation
+# All rights reserved. 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:
+#
+#------------------------------------------------------------------------------
+
+
+#------------------------------------------------------------------------------
+# UINT64
+# EFIAPI
+# InternalMathSwapBytes64 (
+#   IN      UINT64                    Operand
+#   );
+#------------------------------------------------------------------------------
+.globl ASM_PFX(InternalMathSwapBytes64)
+ASM_PFX(InternalMathSwapBytes64):
+    movl    8(%esp), %eax
+    movl    4(%esp), %edx
+    bswapl  %eax
+    bswapl  %edx
+    ret