1 files changed, 98 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseSynchronizationLib/Arm/Synchronization.c b/MdePkg/Library/BaseSynchronizationLib/Arm/Synchronization.c
new file mode 100644
index 0000000000..1da12d5fda
--- /dev/null
+++ b/MdePkg/Library/BaseSynchronizationLib/Arm/Synchronization.c
@@ -0,0 +1,98 @@
+/** @file
+  Implementation of synchronization functions. Still needs to be ported
+
+  Copyright (c) 2006 - 2009, Intel Corporation<BR>
+  Portions copyright (c) 2008-2009 Apple Inc.<BR> 
+  All rights reserved. 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.
+
+**/
+
+UINT32
+EFIAPI
+InternalSyncCompareExchange32 (
+  IN      volatile UINT32           *Value,
+  IN      UINT32                    CompareValue,
+  IN      UINT32                    ExchangeValue
+  )
+{
+  return *Value != CompareValue ? *Value :
+           ((*Value = ExchangeValue), CompareValue);
+}
+
+/**
+  Performs an atomic compare exchange operation on a 64-bit unsigned integer.
+
+  Performs an atomic compare exchange operation on the 64-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 64-bit value for the compare exchange
+                        operation.
+  @param  CompareValue  64-bit value used in compare operation.
+  @param  ExchangeValue 64-bit value used in exchange operation.
+
+  @return The original *Value before exchange.
+
+**/
+UINT64
+EFIAPI
+InternalSyncCompareExchange64 (
+  IN      volatile UINT64           *Value,
+  IN      UINT64                    CompareValue,
+  IN      UINT64                    ExchangeValue
+  )
+{
+  return *Value != CompareValue ? *Value :
+           ((*Value = ExchangeValue), CompareValue);
+}
+
+/**
+  Performs an atomic increment of an 32-bit unsigned integer.
+
+  Performs an atomic increment of the 32-bit unsigned integer specified by
+  Value and returns the incremented value. The increment 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 increment.
+
+  @return The incremented value.
+
+**/
+UINT32
+EFIAPI
+InternalSyncIncrement (
+  IN      volatile UINT32           *Value
+  )
+{
+  return ++*Value;
+}
+
+/**
+  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 --*Value;
+}