projects / urcu.git / blame
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| e4d1eb09 PB |
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. | |
| 13 | * | |
| 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 | ||
| 124 | #ifndef sync_core | |
| 125 | #define sync_core() mb() | |
| 126 | #endif | |
| 127 | ||
| 128 | #ifdef __cplusplus | |
| 129 | } | |
| 130 | #endif | |
| 131 | ||
| 132 | #endif /* _URCU_ARCH_GENERIC_H */ |