membar_ops.S revision 1.2.4.3 
1/*	membar_ops.S,v 1.2.4.2 2008/01/09 01:20:51 matt Exp	*/
2
3/*-
4 * Copyright (c) 2006, 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
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 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the NetBSD
21 *	Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39#include "atomic_op_asm.h"
40
41	.text
42
43#ifdef _KERNEL
44
45/*
46 * We start out with no-op versions that do nothing.  We hot-patch when
47 * we detect a MP system.
48 */
49LEAF_NOPROFILE(_membar_producer, 0)
50	RET
51	nop
52	END(_membar_producer)
53EXPORT(_membar_producer_end)
54
55LEAF_NOPROFILE(_membar_sync, 0)
56	RET
57	nop
58	END(_membar_sync)
59EXPORT(_membar_sync_end)
60
61LEAF_NOPROFILE(_membar_producer_mp, 0)
62	wmb
63	RET
64	END(_membar_producer_mp)
65EXPORT(_membar_producer_mp_end)
66
67LEAF_NOPROFILE(_membar_sync_mp, 0)
68	mb
69	RET
70	END(_membar_sync_mp)
71EXPORT(_membar_sync_mp_end)
72
73#else	/* _KERNEL */
74
75LEAF_NOPROFILE(_membar_producer, 0)
76	mb
77	RET
78	END(_membar_producer)
79EXPORT(_membar_producer_end)
80
81LEAF_NOPROFILE(_membar_sync, 0)
82	mb
83	RET
84	END(_membar_sync)
85EXPORT(_membar_sync_end)
86
87#endif	/* _KERNEL */
88
89ATOMIC_OP_ALIAS(membar_producer,_membar_producer)
90ATOMIC_OP_ALIAS(membar_sync,_membar_sync)
91ATOMIC_OP_ALIAS(membar_enter,_membar_sync)
92STRONG_ALIAS(_membar_enter,_membar_sync)
93ATOMIC_OP_ALIAS(membar_exit,_membar_sync)
94STRONG_ALIAS(_membar_exit,_membar_sync)
95ATOMIC_OP_ALIAS(membar_consumer,_membar_sync)
96STRONG_ALIAS(_membar_consumer,_membar_sync)
97