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Diffstat (limited to '')
| -rw-r--r-- | src/VBox/Runtime/win/amd64/ASMAtomicBitClear.asm | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/VBox/Runtime/win/amd64/ASMAtomicBitClear.asm b/src/VBox/Runtime/win/amd64/ASMAtomicBitClear.asm new file mode 100644 index 00000000..ba6577f2 --- /dev/null +++ b/src/VBox/Runtime/win/amd64/ASMAtomicBitClear.asm @@ -0,0 +1,44 @@ +;; @file +; IPRT - ASMAtomicBitClear(). +; + +; +; Copyright (C) 2006-2019 Oracle Corporation +; +; This file is part of VirtualBox Open Source Edition (OSE), as +; available from http://www.virtualbox.org. This file is free software; +; you can redistribute it and/or modify it under the terms of the GNU +; General Public License (GPL) as published by the Free Software +; Foundation, in version 2 as it comes in the "COPYING" file of the +; VirtualBox OSE distribution. VirtualBox OSE is distributed in the +; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. +; +; The contents of this file may alternatively be used under the terms +; of the Common Development and Distribution License Version 1.0 +; (CDDL) only, as it comes in the "COPYING.CDDL" file of the +; VirtualBox OSE distribution, in which case the provisions of the +; CDDL are applicable instead of those of the GPL. +; +; You may elect to license modified versions of this file under the +; terms and conditions of either the GPL or the CDDL or both. +; + +;******************************************************************************* +;* Header Files * +;******************************************************************************* +%include "iprt/asmdefs.mac" + +BEGINCODE + +;; +; Atomically clears a bit in a bitmap. +; +; @param rcx pvBitmap Pointer to the bitmap. +; @param edx iBit The bit to toggle set. +; @remark No memory barrier, take care on smp. +; +BEGINPROC_EXPORTED ASMAtomicBitClear + lock btr [rcx], edx + ret +ENDPROC ASMAtomicBitClear + |