diff options
Diffstat (limited to 'Core/MdePkg/Library/BaseSynchronizationLib/Ebc')
-rw-r--r-- | Core/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c b/Core/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c new file mode 100644 index 0000000000..a57860203b --- /dev/null +++ b/Core/MdePkg/Library/BaseSynchronizationLib/Ebc/Synchronization.c @@ -0,0 +1,147 @@ +/** @file
+ Implementation of synchronization functions on EBC.
+
+ Copyright (c) 2006 - 2010, Intel Corporation. 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.
+
+**/
+
+/**
+ 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 *Value != CompareValue ? *Value :
+ ((*Value = ExchangeValue), CompareValue);
+}
+
+/**
+ Performs an atomic compare exchange operation on a 32-bit
+ unsigned integer.
+
+ Performs an atomic compare exchange operation on the 32-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 32-bit value for the
+ compare exchange operation.
+ @param CompareValue 32-bit value used in compare operation.
+ @param ExchangeValue 32-bit value used in exchange operation.
+
+ @return The original *Value before exchange.
+
+**/
+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;
+}
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