1/*	$NetBSD: atomic_swap_16.S,v 1.4 2015/05/17 20:57:11 justin Exp $ */
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas of 3am Software Foundry.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "atomic_op_asm.h"
33
34#ifdef _ARM_ARCH_6
35ENTRY_NP(_atomic_swap_16)
36	mov	ip, r0
371:
38	ldrexh	r0, [ip]
39	strexh	r3, r1, [ip]
40	cmp	r3, #0
41	bne	1b
42#ifdef _ARM_ARCH_7
43	dmb
44#else
45	mcr	p15, 0, ip, c7, c10, 5	/* data memory barrier */
46#endif
47	RET
48END(_atomic_swap_16)
49
50ATOMIC_OP_ALIAS(atomic_swap_16,_atomic_swap_16)
51ATOMIC_OP_ALIAS(atomic_swap_short,_atomic_swap_16)
52ATOMIC_OP_ALIAS(atomic_swap_ushort,_atomic_swap_16)
53CRT_ALIAS(__sync_lock_test_and_set_2,_atomic_swap_16)
54CRT_ALIAS(__atomic_exchange_2,_atomic_swap_16)
55STRONG_ALIAS(_atomic_swap_short,_atomic_swap_16)
56STRONG_ALIAS(_atomic_swap_ushort,_atomic_swap_16)
57
58#if (!defined(_KERNEL) || !defined(_RUMPKERNEL)) && !defined(_STANDALONE)
59ENTRY_NP(__sync_lock_release_2)
60	mov	r1, #0
61	strh	r1, [r0]
62	RET
63END(__sync_lock_release_2)
64#endif
65#endif /* _ARM_ARCH_6 */
66