1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/*
*
* Copyright 2014 Google Inc.
* Copyright (C) 2003-2004 Olivier Houchard
* Copyright (C) 1994-1997 Mark Brinicombe
* Copyright (C) 1994 Brini
* All rights reserved.
*
* This code is derived from software written for Brini by Mark Brinicombe
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#ifndef __ARCH_BARRIER_H_
#define __ARCH_BARRIER_H__
#include <arch/cache.h>
/*
* Description of different memory barriers introduced:
*
* Memory barrier(mb) - Guarantees that all memory accesses specified before the
* barrier will happen before all memory accesses specified after the barrier
*
* Read memory barrier (rmb) - Guarantees that all read memory accesses
* specified before the barrier will happen before all read memory accesses
* specified after the barrier
*
* Write memory barrier (wmb) - Guarantees that all write memory accesses
* specified before the barrier will happen before all write memory accesses
* specified after the barrier
*/
/*
* According to ARMv8 Instruction Set Overview:
* Options specified to dmb instruction have the following meaning:
* Option Ordered accesses
* sy any-any
* ld load-load, load-store
* st store-store
*/
#define mb() dmb_opt(sy)
#define rmb() dmb_opt(ld)
#define wmb() dmb_opt(st)
#endif /* __ARCH_BARRIER_H__ */
|
