;; @file

; innotek Portable Runtime - ASMAtomicXchgU8().

;

;

; Copyright (C) 2006-2007 innotek GmbH

;

; 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 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.

;

; If you received this file as part of a commercial VirtualBox

; distribution, then only the terms of your commercial VirtualBox

; license agreement apply instead of the previous paragraph.

;

;*******************************************************************************

;* Header Files *

;*******************************************************************************

%include "iprt/asmdefs.mac"

BEGINCODE

;;

; @returns al Current *pu8 value

; @param rcx pu8 Pointer to the 8-bit variable to update.

; @param dl u8 The 8-bit value to assign to *pu8.

BEGINPROC_EXPORTED ASMAtomicXchgU8

xchg [rcx], dl

movzx eax, dl

ret

ENDPROC ASMAtomicXchgU8