MdePkg: Clean up source files

[mirror_edk2.git] / MdePkg / Library / BaseSynchronizationLib / Ebc / Synchronization.c

diff --git a/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c b/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c
index ad4173d09699c1aa96753ca43ea15f1e4e05da38..c13f4e06bcdbbd307b7eb40aed2ffac6a5164c34 100644 (file)
--- a/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c
+++ b/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c
@@ -1,17 +1,48 @@
 /** @file\r
   Implementation of synchronization functions on EBC.\r
 \r
-  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
+  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
   This program and the accompanying materials\r
   are licensed and made available under the terms and conditions of the BSD License\r
   which accompanies this distribution.  The full text of the license may be found at\r
-  http://opensource.org/licenses/bsd-license.php\r
+  http://opensource.org/licenses/bsd-license.php.\r
 \r
   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
 \r
 **/\r
 \r
+/**\r
+  Performs an atomic compare exchange operation on a 16-bit\r
+  unsigned integer.\r
+\r
+  Performs an atomic compare exchange operation on the 16-bit\r
+  unsigned integer specified by Value.  If Value is equal to\r
+  CompareValue, then Value is set to ExchangeValue and\r
+  CompareValue is returned.  If Value is not equal to\r
+  CompareValue, then Value is returned. The compare exchange\r
+  operation must be performed using MP safe mechanisms.\r
+\r
+  @param  Value         A pointer to the 16-bit value for the\r
+                        compare exchange operation.\r
+  @param  CompareValue  16-bit value used in compare operation.\r
+  @param  ExchangeValue 16-bit value used in exchange operation.\r
+\r
+  @return The original *Value before exchange.\r
+\r
+**/\r
+UINT16\r
+EFIAPI\r
+InternalSyncCompareExchange16 (\r
+  IN      volatile UINT16           *Value,\r
+  IN      UINT16                    CompareValue,\r
+  IN      UINT16                    ExchangeValue\r
+  )\r
+{\r
+  return *Value != CompareValue ? *Value :\r
+           ((*Value = ExchangeValue), CompareValue);\r
+}\r
+\r
 /**\r
   Performs an atomic compare exchange operation on a 32-bit\r
   unsigned integer.\r
@@ -46,9 +77,9 @@ InternalSyncCompareExchange32 (
 /**\r
   Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r
 \r
-  Performs an atomic compare exchange operation on the 64-bit unsigned integer specified \r
-  by Value.  If Value is equal to CompareValue, then Value is set to ExchangeValue and \r
-  CompareValue is returned.  If Value is not equal to CompareValue, then Value is returned. \r
+  Performs an atomic compare exchange operation on the 64-bit unsigned integer specified\r
+  by Value.  If Value is equal to CompareValue, then Value is set to ExchangeValue and\r
+  CompareValue is returned.  If Value is not equal to CompareValue, then Value is returned.\r
   The compare exchange operation must be performed using MP safe mechanisms.\r
 \r
   @param  Value         A pointer to the 64-bit value for the compare exchange\r