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 <arm/asm_help.h>
25
26/*
27 * void
28 * OSSpinLockUnlock(p)
29 *      int *p;
30 *
31 * Unlock the lock pointed to by p.
32 */
33
34EnterARM(_OSSpinLockUnlock)
35EnterARM_NoAlign(_IOSpinUnlock)
36EnterARM_NoAlign(_ev_unlock)
37    mov    r1, #0
38    str    r1, [r0]
39    bx     lr
40
41/*
42 * int
43 * OSSpinLockTry(p)
44 *      int *p;
45 *
46 * Try to lock p.  Return zero if not successful.
47 */
48
49EnterARM(_OSSpinLockTry)
50EnterARM_NoAlign(_IOTrySpinLock)
51EnterARM_NoAlign(_ev_try_lock)
52    mov    r1, #0
53    swp    r1, r1, [r0]
54    cmp    r1, #0
55    moveq  r0, #1
56    movne  r0, #0
57    bx     lr
58