Split out Synchronization Library from Base Library
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7377 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
@@ -0,0 +1,50 @@
|
||||
/** @file
|
||||
InterlockedCompareExchange64 function
|
||||
|
||||
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 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 UINT64 *Value,
|
||||
IN UINT64 CompareValue,
|
||||
IN UINT64 ExchangeValue
|
||||
)
|
||||
{
|
||||
_asm {
|
||||
mov esi, Value
|
||||
mov eax, dword ptr [CompareValue + 0]
|
||||
mov edx, dword ptr [CompareValue + 4]
|
||||
mov ebx, dword ptr [ExchangeValue + 0]
|
||||
mov ecx, dword ptr [ExchangeValue + 4]
|
||||
lock cmpxchg8b qword ptr [esi]
|
||||
}
|
||||
}
|
Reference in New Issue
Block a user