/** @file | |
Implementation of synchronization functions on EBC. | |
Copyright (c) 2006 - 2008, Intel Corporation<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. | |
**/ | |
/** | |
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; | |
} |