urcu/arch/generic.h

   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 CAA_CACHE_LINE_SIZE
  32 #define CAA_CACHE_LINE_SIZE     64
  33 #endif
  34
  35 #if !defined(cmm_mc) && !defined(cmm_rmc) && !defined(cmm_wmc)
  36 #define CONFIG_HAVE_MEM_COHERENCY
  37 /*
  38  * Architectures with cache coherency must _not_ define cmm_mc/cmm_rmc/cmm_wmc.
  39  *
  40  * For them, cmm_mc/cmm_rmc/cmm_wmc are implemented with a simple
  41  * compiler barrier; in addition, we provide defaults for cmm_mb (using
  42  * GCC builtins) as well as cmm_rmb and cmm_wmb (defaulting to cmm_mb).
  43  */
  44
  45 #ifndef cmm_mb
  46 #define cmm_mb()    __sync_synchronize()
  47 #endif
  48
  49 #ifndef cmm_rmb
  50 #define cmm_rmb()       cmm_mb()
  51 #endif
  52
  53 #ifndef cmm_wmb
  54 #define cmm_wmb()       cmm_mb()
  55 #endif
  56
  57 #define cmm_mc()        cmm_barrier()
  58 #define cmm_rmc()       cmm_barrier()
  59 #define cmm_wmc()       cmm_barrier()
  60 #else
  61 /*
  62  * Architectures without cache coherency need something like the following:
  63  *
  64  * #define cmm_mc()     arch_cache_flush()
  65  * #define cmm_rmc()    arch_cache_flush_read()
  66  * #define cmm_wmc()    arch_cache_flush_write()
  67  *
  68  * Of these, only cmm_mc is mandatory. cmm_rmc and cmm_wmc default to
  69  * cmm_mc. cmm_mb/cmm_rmb/cmm_wmb use these definitions by default:
  70  *
  71  * #define cmm_mb()     cmm_mc()
  72  * #define cmm_rmb()    cmm_rmc()
  73  * #define cmm_wmb()    cmm_wmc()
  74  */
  75
  76 #ifndef cmm_mb
  77 #define cmm_mb()        cmm_mc()
  78 #endif
  79
  80 #ifndef cmm_rmb
  81 #define cmm_rmb()       cmm_rmc()
  82 #endif
  83
  84 #ifndef cmm_wmb
  85 #define cmm_wmb()       cmm_wmc()
  86 #endif
  87
  88 #ifndef cmm_rmc
  89 #define cmm_rmc()       cmm_mc()
  90 #endif
  91
  92 #ifndef cmm_wmc
  93 #define cmm_wmc()       cmm_mc()
  94 #endif
  95 #endif
  96
  97 /* Nop everywhere except on alpha. */
  98 #ifndef cmm_read_barrier_depends
  99 #define cmm_read_barrier_depends()
 100 #endif
 101
 102 #ifdef CONFIG_RCU_SMP
 103 #ifndef cmm_smp_mb
 104 #define cmm_smp_mb()    cmm_mb()
 105 #endif
 106 #ifndef cmm_smp_rmb
 107 #define cmm_smp_rmb()   cmm_rmb()
 108 #endif
 109 #ifndef cmm_smp_wmb
 110 #define cmm_smp_wmb()   cmm_wmb()
 111 #endif
 112 #ifndef cmm_smp_mc
 113 #define cmm_smp_mc()    cmm_mc()
 114 #endif
 115 #ifndef cmm_smp_rmc
 116 #define cmm_smp_rmc()   cmm_rmc()
 117 #endif
 118 #ifndef cmm_smp_wmc
 119 #define cmm_smp_wmc()   cmm_wmc()
 120 #endif
 121 #ifndef cmm_smp_read_barrier_depends
 122 #define cmm_smp_read_barrier_depends()  cmm_read_barrier_depends()
 123 #endif
 124 #else
 125 #ifndef cmm_smp_mb
 126 #define cmm_smp_mb()    cmm_barrier()
 127 #endif
 128 #ifndef cmm_smp_rmb
 129 #define cmm_smp_rmb()   cmm_barrier()
 130 #endif
 131 #ifndef cmm_smp_wmb
 132 #define cmm_smp_wmb()   cmm_barrier()
 133 #endif
 134 #ifndef cmm_smp_mc
 135 #define cmm_smp_mc()    cmm_barrier()
 136 #endif
 137 #ifndef cmm_smp_rmc
 138 #define cmm_smp_rmc()   cmm_barrier()
 139 #endif
 140 #ifndef cmm_smp_wmc
 141 #define cmm_smp_wmc()   cmm_barrier()
 142 #endif
 143 #ifndef cmm_smp_read_barrier_depends
 144 #define cmm_smp_read_barrier_depends()
 145 #endif
 146 #endif
 147
 148 #ifndef caa_cpu_relax
 149 #define caa_cpu_relax()         cmm_barrier()
 150 #endif
 151
 152 #ifdef __cplusplus
 153 }
 154 #endif
 155
 156 #endif /* _URCU_ARCH_GENERIC_H */