1 files changed, 54 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.c b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.c
new file mode 100644
index 000000000000..d51d6e361061
--- /dev/null
+++ b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.c
@@ -0,0 +1,54 @@
+/** @file
+  InterlockedCompareExchange16 function
+
+  Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2015, Linaro Ltd. 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.
+**/
+
+__int16 _InterlockedCompareExchange16(
+   __int16 volatile * Destination,
+   __int16 Exchange,
+   __int16 Comperand
+);
+
+#pragma intrinsic(_InterlockedCompareExchange16)
+
+/**
+  Performs an atomic compare exchange operation on a 16-bit unsigned integer.
+
+  Performs an atomic compare exchange operation on the 16-bit unsigned integer specified
+  by Value.  If Value is equal to CompareValue, then Value is set to ExchangeValue and
+  CompareValue is returned.  If Value is not equal to CompareValue, then Value is returned.
+  The compare exchange operation must be performed using MP safe mechanisms.
+
+  @param  Value         A pointer to the 16-bit value for the compare exchange
+                        operation.
+  @param  CompareValue  16-bit value used in compare operation.
+  @param  ExchangeValue 16-bit value used in exchange operation.
+
+  @return The original *Value before exchange.
+
+**/
+UINT16
+EFIAPI
+InternalSyncCompareExchange16 (
+  IN      volatile UINT16           *Value,
+  IN      UINT16                    CompareValue,
+  IN      UINT16                    ExchangeValue
+  )
+{
+  return _InterlockedCompareExchange16 (Value, ExchangeValue, CompareValue);
+}
+