1 files changed, 35 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/X64/InterlockedDecrement.c b/MdePkg/Library/BaseLib/X64/InterlockedDecrement.c
new file mode 100644
index 0000000000..bc171a79cc
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/InterlockedDecrement.c
@@ -0,0 +1,35 @@
+/** @file
+  InterlockedDecrement function
+
+  Copyright (c) 2006, Intel Corporation<BR>
+  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.
+
+**/
+
+#if _MSC_EXTENSIONS
+
+//
+// Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics
+//
+long _InterlockedDecrement(
+   long * lpAddend
+);
+
+#pragma intrinsic(_InterlockedDecrement)
+
+UINT32
+EFIAPI
+InternalSyncDecrement (
+  IN      UINT32                    *Value
+  )
+{
+  return _InterlockedDecrement (Value);
+}
+
+#endif