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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> | |
26 | ||
27 | #ifdef __cplusplus | |
28 | extern "C" { | |
29 | #endif | |
30 | ||
31 | #ifndef CACHE_LINE_SIZE | |
32 | #define CACHE_LINE_SIZE 64 | |
33 | #endif | |
34 | ||
35 | #if !defined(mc) && !defined(rmc) && !defined(wmc) | |
36 | #define CONFIG_HAVE_MEM_COHERENCY | |
37 | /* | |
38 | * Architectures with cache coherency must _not_ define mc/rmc/wmc. | |
39 | * | |
40 | * For them, mc/rmc/wmc are implemented with a * simple compiler barrier; | |
41 | * in addition, we provide defaults for mb (using GCC builtins) as well as | |
42 | * rmb and wmb (defaulting to mb). | |
43 | */ | |
44 | ||
45 | #ifndef mb | |
46 | #define mb() __sync_synchronize() | |
47 | #endif | |
48 | ||
49 | #ifndef rmb | |
50 | #define rmb() mb() | |
51 | #endif | |
52 | ||
53 | #ifndef wmb | |
54 | #define wmb() mb() | |
55 | #endif | |
56 | ||
57 | #define mc() barrier() | |
58 | #define rmc() barrier() | |
59 | #define wmc() barrier() | |
60 | #else | |
61 | /* | |
62 | * Architectures without cache coherency need something like the following: | |
63 | * | |
64 | * #define mc() arch_cache_flush() | |
65 | * #define rmc() arch_cache_flush_read() | |
66 | * #define wmc() arch_cache_flush_write() | |
67 | * | |
68 | * Of these, only mc is mandatory. rmc and wmc default to mc. mb/rmb/wmb | |
69 | * use these definitions by default: | |
70 | * | |
71 | * #define mb() mc() | |
72 | * #define rmb() rmc() | |
73 | * #define wmb() wmc() | |
74 | */ | |
75 | ||
76 | #ifndef mb | |
77 | #define mb() mc() | |
78 | #endif | |
79 | ||
80 | #ifndef rmb | |
81 | #define rmb() rmc() | |
82 | #endif | |
83 | ||
84 | #ifndef wmb | |
85 | #define wmb() wmc() | |
86 | #endif | |
87 | ||
88 | #ifndef rmc | |
89 | #define rmc() mc() | |
90 | #endif | |
91 | ||
92 | #ifndef wmc | |
93 | #define wmc() mc() | |
94 | #endif | |
95 | #endif | |
96 | ||
97 | /* Nop everywhere except on alpha. */ | |
98 | #ifndef read_barrier_depends | |
99 | #define read_barrier_depends() | |
100 | #endif | |
101 | ||
102 | #ifdef CONFIG_RCU_SMP | |
103 | #define smp_mb() mb() | |
104 | #define smp_rmb() rmb() | |
105 | #define smp_wmb() wmb() | |
106 | #define smp_mc() mc() | |
107 | #define smp_rmc() rmc() | |
108 | #define smp_wmc() wmc() | |
109 | #define smp_read_barrier_depends() read_barrier_depends() | |
110 | #else | |
111 | #define smp_mb() barrier() | |
112 | #define smp_rmb() barrier() | |
113 | #define smp_wmb() barrier() | |
114 | #define smp_mc() barrier() | |
115 | #define smp_rmc() barrier() | |
116 | #define smp_wmc() barrier() | |
117 | #define smp_read_barrier_depends() | |
118 | #endif | |
119 | ||
120 | #ifndef cpu_relax | |
121 | #define cpu_relax() barrier() | |
122 | #endif | |
123 | ||
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124 | #ifdef __cplusplus |
125 | } | |
126 | #endif | |
127 | ||
128 | #endif /* _URCU_ARCH_GENERIC_H */ |