1 #ifndef _URCU_ARCH_GENERIC_H
2 #define _URCU_ARCH_GENERIC_H
5 * arch_generic.h: common definitions for multiple architectures.
7 * Copyright (c) 2010 Paolo Bonzini <pbonzini@redhat.com>
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.
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.
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
24 #include <urcu/compiler.h>
25 #include <urcu/config.h>
31 #ifndef CAA_CACHE_LINE_SIZE
32 #define CAA_CACHE_LINE_SIZE 64
35 #if !defined(cmm_mc) && !defined(cmm_rmc) && !defined(cmm_wmc)
36 #define CONFIG_HAVE_MEM_COHERENCY
38 * Architectures with cache coherency must _not_ define cmm_mc/cmm_rmc/cmm_wmc.
40 * For them, cmm_mc/cmm_rmc/cmm_wmc are implemented with a * simple compiler barrier;
41 * in addition, we provide defaults for cmm_mb (using GCC builtins) as well as
42 * cmm_rmb and cmm_wmb (defaulting to cmm_mb).
46 #define cmm_mb() __sync_synchronize()
50 #define cmm_rmb() cmm_mb()
54 #define cmm_wmb() cmm_mb()
57 #define cmm_mc() cmm_barrier()
58 #define cmm_rmc() cmm_barrier()
59 #define cmm_wmc() cmm_barrier()
62 * Architectures without cache coherency need something like the following:
64 * #define cmm_mc() arch_cache_flush()
65 * #define cmm_rmc() arch_cache_flush_read()
66 * #define cmm_wmc() arch_cache_flush_write()
68 * Of these, only cmm_mc is mandatory. cmm_rmc and cmm_wmc default to cmm_mc.
69 * cmm_mb/cmm_rmb/cmm_wmb use these definitions by default:
71 * #define cmm_mb() cmm_mc()
72 * #define cmm_rmb() cmm_rmc()
73 * #define cmm_wmb() cmm_wmc()
77 #define cmm_mb() cmm_mc()
81 #define cmm_rmb() cmm_rmc()
85 #define cmm_wmb() cmm_wmc()
89 #define cmm_rmc() cmm_mc()
93 #define cmm_wmc() cmm_mc()
97 /* Nop everywhere except on alpha. */
98 #ifndef cmm_read_barrier_depends
99 #define cmm_read_barrier_depends()
102 #ifdef CONFIG_RCU_SMP
103 #define cmm_smp_mb() cmm_mb()
104 #define cmm_smp_rmb() cmm_rmb()
105 #define cmm_smp_wmb() cmm_wmb()
106 #define cmm_smp_mc() cmm_mc()
107 #define cmm_smp_rmc() cmm_rmc()
108 #define cmm_smp_wmc() cmm_wmc()
109 #define cmm_smp_read_barrier_depends() cmm_read_barrier_depends()
111 #define cmm_smp_mb() cmm_barrier()
112 #define cmm_smp_rmb() cmm_barrier()
113 #define cmm_smp_wmb() cmm_barrier()
114 #define cmm_smp_mc() cmm_barrier()
115 #define cmm_smp_rmc() cmm_barrier()
116 #define cmm_smp_wmc() cmm_barrier()
117 #define cmm_smp_read_barrier_depends()
120 #ifndef caa_cpu_relax
121 #define caa_cpu_relax() cmm_barrier()
128 #endif /* _URCU_ARCH_GENERIC_H */
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