1 files changed, 46 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedDecrement.c b/Core/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedDecrement.c
new file mode 100644
index 0000000000..da402cd4c6
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+++ b/Core/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedDecrement.c
@@ -0,0 +1,46 @@
+/** @file
+  InterlockedDecrement function
+
+  Copyright (c) 2006 - 2016, 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.
+
+**/
+
+/**
+  Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
+**/
+
+long _InterlockedDecrement(
+   long * lpAddend
+);
+
+#pragma intrinsic(_InterlockedDecrement)
+
+/**
+  Performs an atomic decrement of an 32-bit unsigned integer.
+
+  Performs an atomic decrement of the 32-bit unsigned integer specified by
+  Value and returns the decrement value. The decrement operation must be
+  performed using MP safe mechanisms. The state of the return value is not
+  guaranteed to be MP safe.
+
+  @param  Value A pointer to the 32-bit value to decrement.
+
+  @return The decrement value.
+
+**/
+UINT32
+EFIAPI
+InternalSyncDecrement (
+  IN      volatile UINT32           *Value
+  )
+{
+  return _InterlockedDecrement ((long *)(UINTN)(Value));
+}
+