1/* $NetBSD: atomic_nand_32.S,v 1.1 2014/08/10 05:47:35 matt Exp $ */
2
3/*-
4 * Copyright (c) 2014 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
34ENTRY_NP(_atomic_nand_32)
35	mov	x4, x0
361:	ldxr	w0, [x4]		/* load old value (to be returned) */
37	mvn	w3, w0			/* complement source */
38	and	w3, w3, w1		/* calculate new value */
39	stxr	w2, w3, [x4]		/* try to store */
40	cbnz	w2, 1b			/*   succeed? no, try again */
41	dmb	st
42	ret				/* return old value */
43END(_atomic_nand_32)
44
45ATOMIC_OP_ALIAS(atomic_nand_32,_atomic_nand_32)
46ATOMIC_OP_ALIAS(atomic_nand_uint,_atomic_nand_32)
47STRONG_ALIAS(__sync_fetch_and_nand_4,_atomic_nand_32)
48STRONG_ALIAS(_atomic_nand_uint,_atomic_nand_32)
49
50ENTRY_NP(_atomic_nand_32_nv)
51	mov	x4, x0			/* need r0 for return value */
521:	ldxr	w0, [x4]		/* load old value */
53	mvn	w0, w0			/* complement source */
54	and	w0, w0, w1		/* calculate new value (return value) */
55	stxr	w2, w0, [x4]		/* try to store */
56	cbnz	w2, 1b			/*   succeed? no, try again? */
57	dmb	st
58	ret				/* return new value */
59END(_atomic_nand_32_nv)
60
61ATOMIC_OP_ALIAS(atomic_nand_32_nv,_atomic_nand_32_nv)
62ATOMIC_OP_ALIAS(atomic_nand_uint_nv,_atomic_nand_32_nv)
63STRONG_ALIAS(__sync_nand_and_fetch_4,_atomic_nand_32_nv)
64STRONG_ALIAS(_atomic_nand_uint_nv,_atomic_nand_32_nv)
65