1/*	$NetBSD: atomic_swap.S,v 1.8 2022/02/27 19:21:53 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <machine/asm.h>
30#include "atomic_op_asm.h"
31
32RCSID("$NetBSD: atomic_swap.S,v 1.8 2022/02/27 19:21:53 riastradh Exp $")
33
34	.text
35	.set	noreorder
36#ifdef _KERNEL_OPT
37#include "opt_cputype.h"
38#ifndef MIPS3_LOONGSON2F
39	.set	noat
40	.set	nomacro
41#endif
42#else /* _KERNEL_OPT */
43	.set	noat
44	.set	nomacro
45#endif /* _KERNEL_OPT */
46
47LEAF(_atomic_swap_32)
48	LLSCSYNC
491:	INT_LL		v0, 0(a0)
50	 nop
51	move		t0, a1
52	INT_SC		t0, 0(a0)
53	beq		t0, zero, 1b
54 	 nop
552:
56	j		ra
57	 BDSYNC_PLUNGER
58END(_atomic_swap_32)
59ATOMIC_OP_ALIAS(atomic_swap_32, _atomic_swap_32)
60
61#if !defined(__mips_o32)
62LEAF(_atomic_swap_64)
63	LLSCSYNC
641:	REG_LL		v0, 0(a0)
65	 nop
66	move		t0, a1
67	REG_SC		t0, 0(a0)
68	beq		t0, zero, 1b
69 	 nop
702:
71	j		ra
72	 BDSYNC_PLUNGER
73END(_atomic_swap_64)
74ATOMIC_OP_ALIAS(atomic_swap_64, _atomic_swap_64)
75#endif
76
77#ifdef _LP64
78STRONG_ALIAS(_atomic_swap_ptr,		_atomic_swap_64)
79STRONG_ALIAS(_atomic_swap_ulong,	_atomic_swap_64)
80#else
81STRONG_ALIAS(_atomic_swap_ptr,		_atomic_swap_32)
82STRONG_ALIAS(_atomic_swap_ulong,	_atomic_swap_32)
83#endif
84STRONG_ALIAS(_atomic_swap_uint,		_atomic_swap_32)
85
86ATOMIC_OP_ALIAS(atomic_swap_ptr,	_atomic_swap_ptr)
87ATOMIC_OP_ALIAS(atomic_swap_uint,	_atomic_swap_uint)
88ATOMIC_OP_ALIAS(atomic_swap_ulong,	_atomic_swap_ulong)
89