Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break existing...

[mirror_edk2.git] / OldMdePkg / Library / BaseLib / Ipf / Synchronization.c

diff --git a/OldMdePkg/Library/BaseLib/Ipf/Synchronization.c b/OldMdePkg/Library/BaseLib/Ipf/Synchronization.c
new file mode 100644 (file)
index 0000000..c29a876
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/Ipf/Synchronization.c
@@ -0,0 +1,79 @@
+/** @file\r
+  Implementation of synchronization functions on Itanium.\r
+\r
+  Copyright (c) 2006, 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
+\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
+  Module Name:  Synchronization.c\r
+\r
+**/\r
+\r
+#include "BaseLibInternals.h"\r
+\r
+/**\r
+  Performs an atomic increment of an 32-bit unsigned integer.\r
+\r
+  Performs an atomic increment of the 32-bit unsigned integer specified by\r
+  Value and returns the incremented value. The increment operation must be\r
+  performed using MP safe mechanisms. The state of the return value is not\r
+  guaranteed to be MP safe.\r
+\r
+  @param  Value A pointer to the 32-bit value to increment.\r
+\r
+  @return The incremented value.\r
+\r
+**/\r
+UINT32\r
+EFIAPI\r
+InternalSyncIncrement (\r
+  IN      volatile UINT32           *Value\r
+  )\r
+{\r
+  UINT32                            OriginalValue;\r
+\r
+  do {\r
+    OriginalValue = *Value;\r
+  } while (OriginalValue != InternalSyncCompareExchange32 (\r
+                              Value,\r
+                              OriginalValue,\r
+                              OriginalValue + 1\r
+                              ));\r
+  return OriginalValue + 1;\r
+}\r
+\r
+/**\r
+  Performs an atomic decrement of an 32-bit unsigned integer.\r
+\r
+  Performs an atomic decrement of the 32-bit unsigned integer specified by\r
+  Value and returns the decrement value. The decrement operation must be\r
+  performed using MP safe mechanisms. The state of the return value is not\r
+  guaranteed to be MP safe.\r
+\r
+  @param  Value A pointer to the 32-bit value to decrement.\r
+\r
+  @return The decrement value.\r
+\r
+**/\r
+UINT32\r
+EFIAPI\r
+InternalSyncDecrement (\r
+  IN      volatile UINT32           *Value\r
+  )\r
+{\r
+  UINT32                            OriginalValue;\r
+\r
+  do {\r
+    OriginalValue = *Value;\r
+  } while (OriginalValue != InternalSyncCompareExchange32 (\r
+                              Value,\r
+                              OriginalValue,\r
+                              OriginalValue - 1\r
+                              ));\r
+  return OriginalValue - 1;\r
+}\r