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>
26 #include <urcu/syscall-compat.h>
32 #ifndef CAA_CACHE_LINE_SIZE
33 #define CAA_CACHE_LINE_SIZE 64
36 #if !defined(cmm_mc) && !defined(cmm_rmc) && !defined(cmm_wmc)
37 #define CONFIG_HAVE_MEM_COHERENCY
39 * Architectures with cache coherency must _not_ define cmm_mc/cmm_rmc/cmm_wmc.
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).
47 #define cmm_mb() __sync_synchronize()
51 #define cmm_rmb() cmm_mb()
55 #define cmm_wmb() cmm_mb()
58 #define cmm_mc() cmm_barrier()
59 #define cmm_rmc() cmm_barrier()
60 #define cmm_wmc() cmm_barrier()
63 * Architectures without cache coherency need something like the following:
65 * #define cmm_mc() arch_cache_flush()
66 * #define cmm_rmc() arch_cache_flush_read()
67 * #define cmm_wmc() arch_cache_flush_write()
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:
72 * #define cmm_mb() cmm_mc()
73 * #define cmm_rmb() cmm_rmc()
74 * #define cmm_wmb() cmm_wmc()
78 #define cmm_mb() cmm_mc()
82 #define cmm_rmb() cmm_rmc()
86 #define cmm_wmb() cmm_wmc()
90 #define cmm_rmc() cmm_mc()
94 #define cmm_wmc() cmm_mc()
98 /* Nop everywhere except on alpha. */
99 #ifndef cmm_read_barrier_depends
100 #define cmm_read_barrier_depends()
103 #ifdef CONFIG_RCU_SMP
105 #define cmm_smp_mb() cmm_mb()
108 #define cmm_smp_rmb() cmm_rmb()
111 #define cmm_smp_wmb() cmm_wmb()
114 #define cmm_smp_mc() cmm_mc()
117 #define cmm_smp_rmc() cmm_rmc()
120 #define cmm_smp_wmc() cmm_wmc()
122 #ifndef cmm_smp_read_barrier_depends
123 #define cmm_smp_read_barrier_depends() cmm_read_barrier_depends()
127 #define cmm_smp_mb() cmm_barrier()
130 #define cmm_smp_rmb() cmm_barrier()
133 #define cmm_smp_wmb() cmm_barrier()
136 #define cmm_smp_mc() cmm_barrier()
139 #define cmm_smp_rmc() cmm_barrier()
142 #define cmm_smp_wmc() cmm_barrier()
144 #ifndef cmm_smp_read_barrier_depends
145 #define cmm_smp_read_barrier_depends()
149 #ifndef caa_cpu_relax
150 #define caa_cpu_relax() cmm_barrier()
153 #ifndef HAS_CAA_GET_CYCLES
154 #define HAS_CAA_GET_CYCLES
156 #ifdef CONFIG_RCU_HAVE_CLOCK_GETTIME
161 typedef uint64_t caa_cycles_t
;
163 static inline caa_cycles_t
caa_get_cycles (void)
167 if (caa_unlikely(clock_gettime(CLOCK_MONOTONIC
, &ts
)))
169 return ((uint64_t) ts
.tv_sec
* 1000000000ULL) + ts
.tv_nsec
;
172 #elif defined(__APPLE__)
174 #include <mach/mach.h>
175 #include <mach/clock.h>
176 #include <mach/mach_time.h>
180 typedef uint64_t caa_cycles_t
;
182 static inline caa_cycles_t
caa_get_cycles (void)
184 mach_timespec_t ts
= { 0, 0 };
185 static clock_serv_t clock_service
;
187 if (caa_unlikely(!clock_service
)) {
188 if (host_get_clock_service(mach_host_self(),
189 SYSTEM_CLOCK
, &clock_service
))
192 if (caa_unlikely(clock_get_time(clock_service
, &ts
)))
194 return ((uint64_t) ts
.tv_sec
* 1000000000ULL) + ts
.tv_nsec
;
199 #error caa_get_cycles() not implemented for this platform.
203 #endif /* HAS_CAA_GET_CYCLES */
209 #endif /* _URCU_ARCH_GENERIC_H */