/*
* Copyright (c) 1998-2010 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#include <architecture/i386/asm_help.h>
TEXT
/*
* void
* OSSpinLockUnlock(p)
* int *p * Unlock the lock pointed to by p.
*/
LEAF(_OSSpinLockUnlock, 0)
LEAF(_IOSpinUnlock, 0)
LEAF(_ev_unlock, 0)
movl $0, (%rdi)
END(_OSSpinLockUnlock)
/*
* int
* OSSpinLockTry(p)
* int *p * Try to lock p. Return zero if not successful.
*/
LEAF(_OSSpinLockTry, 0)
LEAF(_IOTrySpinLock, 0)
LEAF(_ev_try_lock, 0)
xorl %eax, %eax
orl $-1, %edx
lock
cmpxchgl %edx, (%rdi)
setz %dl
movzbl %dl, %eax
END(_OSSpinLockTry)