1 | /* $NetBSD: barrier.h,v 1.2 2014/03/18 18:20:42 riastradh 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 Taylor R. Campbell. |
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 | #ifndef _ASM_BARRIER_H_ |
33 | #define _ASM_BARRIER_H_ |
34 | |
35 | #include <sys/atomic.h> |
36 | |
37 | #ifdef _KERNEL_OPT |
38 | #include "opt_multiprocessor.h" |
39 | #endif |
40 | |
41 | #define mb membar_sync |
42 | #define wmb membar_producer |
43 | #define rmb membar_consumer |
44 | |
45 | #ifdef __alpha__ /* XXX As if... */ |
46 | # define read_barrier_depends membar_sync |
47 | #else |
48 | # define read_barrier_depends() do {} while (0) |
49 | #endif |
50 | |
51 | #ifdef MULTIPROCESSOR |
52 | # define smp_mb mb |
53 | # define smp_wmb wmb |
54 | # define smp_rmb rmb |
55 | # define smp_read_barrier_depends read_barrier_depends |
56 | #else |
57 | # define smp_mb() do {} while (0) |
58 | # define smp_wmb() do {} while (0) |
59 | # define smp_rmb() do {} while (0) |
60 | # define smp_read_barrier_depends() do {} while (0) |
61 | #endif |
62 | |
63 | #endif /* _ASM_BARRIER_H_ */ |
64 | |