MdePkg: Replace BSD License with BSD+Patent License

[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 dfae40b92771f8ec43ba5b64fc37d9e495d19595..a45f509e6471e4be3d91b84fe77c0e62b69e0e17 100644 (file)
--- a/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c
+++ b/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c
@@ -1,16 +1,41 @@
 /** @file\r
   Implementation of synchronization functions on EBC.\r
 \r
-  Copyright (c) 2006 - 2008, Intel Corporation<BR>\r
-  All rights reserved. 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
+  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
+  SPDX-License-Identifier: BSD-2-Clause-Patent\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
+  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
@@ -46,9 +71,9 @@ 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