From 720d3c5fb31b6b2df535f7a281d5d9d297c5eede Mon Sep 17 00:00:00 2001 From: mdkinney Date: Fri, 30 Jan 2009 00:45:13 +0000 Subject: 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 --- .../Ia32/InterlockedCompareExchange64.c | 50 ++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.c (limited to 'MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.c') diff --git a/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.c b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.c new file mode 100644 index 0000000000..63aafda4b6 --- /dev/null +++ b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.c @@ -0,0 +1,50 @@ +/** @file + InterlockedCompareExchange64 function + + Copyright (c) 2006 - 2008, Intel Corporation
+ 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] + } +} -- cgit v1.2.3