x86: allocate membarrier system call number
[urcu.git] / urcu / arch / generic.h
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1#ifndef _URCU_ARCH_GENERIC_H
2#define _URCU_ARCH_GENERIC_H
3
4/*
5 * arch_generic.h: common definitions for multiple architectures.
6 *
7 * Copyright (c) 2010 Paolo Bonzini <pbonzini@redhat.com>
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
05dd4b94 13 *
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14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <urcu/compiler.h>
25#include <urcu/config.h>
999991c6 26#include <urcu/syscall-compat.h>
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27
28#ifdef __cplusplus
29extern "C" {
30#endif
31
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32#ifndef CAA_CACHE_LINE_SIZE
33#define CAA_CACHE_LINE_SIZE 64
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34#endif
35
5481ddb3 36#if !defined(cmm_mc) && !defined(cmm_rmc) && !defined(cmm_wmc)
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37#define CONFIG_HAVE_MEM_COHERENCY
38/*
5481ddb3 39 * Architectures with cache coherency must _not_ define cmm_mc/cmm_rmc/cmm_wmc.
e4d1eb09 40 *
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41 * For them, cmm_mc/cmm_rmc/cmm_wmc are implemented with a simple
42 * compiler barrier; in addition, we provide defaults for cmm_mb (using
43 * GCC builtins) as well as cmm_rmb and cmm_wmb (defaulting to cmm_mb).
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44 */
45
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46#ifndef cmm_mb
47#define cmm_mb() __sync_synchronize()
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48#endif
49
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50#ifndef cmm_rmb
51#define cmm_rmb() cmm_mb()
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52#endif
53
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54#ifndef cmm_wmb
55#define cmm_wmb() cmm_mb()
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56#endif
57
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58#define cmm_mc() cmm_barrier()
59#define cmm_rmc() cmm_barrier()
60#define cmm_wmc() cmm_barrier()
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61#else
62/*
63 * Architectures without cache coherency need something like the following:
64 *
d0bbd9c2 65 * #define cmm_mc() arch_cache_flush()
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66 * #define cmm_rmc() arch_cache_flush_read()
67 * #define cmm_wmc() arch_cache_flush_write()
e4d1eb09 68 *
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69 * Of these, only cmm_mc is mandatory. cmm_rmc and cmm_wmc default to
70 * cmm_mc. cmm_mb/cmm_rmb/cmm_wmb use these definitions by default:
e4d1eb09 71 *
d0bbd9c2 72 * #define cmm_mb() cmm_mc()
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73 * #define cmm_rmb() cmm_rmc()
74 * #define cmm_wmb() cmm_wmc()
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75 */
76
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77#ifndef cmm_mb
78#define cmm_mb() cmm_mc()
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79#endif
80
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81#ifndef cmm_rmb
82#define cmm_rmb() cmm_rmc()
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83#endif
84
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85#ifndef cmm_wmb
86#define cmm_wmb() cmm_wmc()
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87#endif
88
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89#ifndef cmm_rmc
90#define cmm_rmc() cmm_mc()
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91#endif
92
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93#ifndef cmm_wmc
94#define cmm_wmc() cmm_mc()
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95#endif
96#endif
97
98/* Nop everywhere except on alpha. */
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99#ifndef cmm_read_barrier_depends
100#define cmm_read_barrier_depends()
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101#endif
102
103#ifdef CONFIG_RCU_SMP
0bd48ad3 104#ifndef cmm_smp_mb
5481ddb3 105#define cmm_smp_mb() cmm_mb()
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106#endif
107#ifndef cmm_smp_rmb
5481ddb3 108#define cmm_smp_rmb() cmm_rmb()
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109#endif
110#ifndef cmm_smp_wmb
5481ddb3 111#define cmm_smp_wmb() cmm_wmb()
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112#endif
113#ifndef cmm_smp_mc
5481ddb3 114#define cmm_smp_mc() cmm_mc()
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115#endif
116#ifndef cmm_smp_rmc
5481ddb3 117#define cmm_smp_rmc() cmm_rmc()
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118#endif
119#ifndef cmm_smp_wmc
5481ddb3 120#define cmm_smp_wmc() cmm_wmc()
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121#endif
122#ifndef cmm_smp_read_barrier_depends
5481ddb3 123#define cmm_smp_read_barrier_depends() cmm_read_barrier_depends()
0bd48ad3 124#endif
e4d1eb09 125#else
0bd48ad3 126#ifndef cmm_smp_mb
5481ddb3 127#define cmm_smp_mb() cmm_barrier()
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128#endif
129#ifndef cmm_smp_rmb
5481ddb3 130#define cmm_smp_rmb() cmm_barrier()
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131#endif
132#ifndef cmm_smp_wmb
5481ddb3 133#define cmm_smp_wmb() cmm_barrier()
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134#endif
135#ifndef cmm_smp_mc
5481ddb3 136#define cmm_smp_mc() cmm_barrier()
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137#endif
138#ifndef cmm_smp_rmc
5481ddb3 139#define cmm_smp_rmc() cmm_barrier()
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140#endif
141#ifndef cmm_smp_wmc
5481ddb3 142#define cmm_smp_wmc() cmm_barrier()
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143#endif
144#ifndef cmm_smp_read_barrier_depends
5481ddb3 145#define cmm_smp_read_barrier_depends()
e4d1eb09 146#endif
0bd48ad3 147#endif
e4d1eb09 148
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149#ifndef caa_cpu_relax
150#define caa_cpu_relax() cmm_barrier()
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151#endif
152
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153#ifdef __cplusplus
154}
155#endif
156
157#endif /* _URCU_ARCH_GENERIC_H */
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