1/*
2 * Copyright (c) 1998-2010 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24#include <architecture/i386/asm_help.h>
25
26	TEXT
27
28/*
29 * void
30 * OSSpinLockUnlock(p)
31 *	int *p;
32 *
33 * Unlock the lock pointed to by p.
34 */
35
36LEAF(_OSSpinLockUnlock, 0)
37LEAF(_IOSpinUnlock, 0)
38LEAF(_ev_unlock, 0)
39	movl		4(%esp), %ecx
40	movl		$0, (%ecx)
41END(_OSSpinLockUnlock)
42
43
44/*
45 * int
46 * OSSpinLockTry(p)
47 *	int *p;
48 *
49 * Try to lock p.  Return zero if not successful.
50 */
51
52LEAF(_OSSpinLockTry, 0)
53LEAF(_IOTrySpinLock, 0)
54LEAF(_ev_try_lock, 0)
55        movl            4(%esp), %ecx
56	xorl		%eax, %eax
57        lock
58        cmpxchgl        %ecx, (%ecx)
59	jne	1f
60	movl	$1, %eax		/* yes */
61	ret
621:
63	xorl	%eax, %eax		/* no */
64END(_OSSpinLockTry)
65