1 // SPDX-FileCopyrightText: 2010 Paolo Bonzini <pbonzini@redhat.com>
3 // SPDX-License-Identifier: LGPL-2.1-or-later
5 #ifndef _URCU_ARCH_GENERIC_H
6 #define _URCU_ARCH_GENERIC_H
9 * arch_generic.h: common definitions for multiple architectures.
12 #include <urcu/compiler.h>
13 #include <urcu/config.h>
14 #include <urcu/syscall-compat.h>
20 #ifndef CAA_CACHE_LINE_SIZE
21 #define CAA_CACHE_LINE_SIZE 64
24 #if !defined(cmm_mc) && !defined(cmm_rmc) && !defined(cmm_wmc)
25 #define CONFIG_HAVE_MEM_COHERENCY
27 * Architectures with cache coherency must _not_ define cmm_mc/cmm_rmc/cmm_wmc.
29 * For them, cmm_mc/cmm_rmc/cmm_wmc are implemented with a simple
30 * compiler barrier; in addition, we provide defaults for cmm_mb (using
31 * GCC builtins) as well as cmm_rmb and cmm_wmb (defaulting to cmm_mb).
35 #define cmm_mb() __sync_synchronize()
39 #define cmm_rmb() cmm_mb()
43 #define cmm_wmb() cmm_mb()
46 #define cmm_mc() cmm_barrier()
47 #define cmm_rmc() cmm_barrier()
48 #define cmm_wmc() cmm_barrier()
51 * Architectures without cache coherency need something like the following:
53 * #define cmm_mc() arch_cache_flush()
54 * #define cmm_rmc() arch_cache_flush_read()
55 * #define cmm_wmc() arch_cache_flush_write()
57 * Of these, only cmm_mc is mandatory. cmm_rmc and cmm_wmc default to
58 * cmm_mc. cmm_mb/cmm_rmb/cmm_wmb use these definitions by default:
60 * #define cmm_mb() cmm_mc()
61 * #define cmm_rmb() cmm_rmc()
62 * #define cmm_wmb() cmm_wmc()
66 #define cmm_mb() cmm_mc()
70 #define cmm_rmb() cmm_rmc()
74 #define cmm_wmb() cmm_wmc()
78 #define cmm_rmc() cmm_mc()
82 #define cmm_wmc() cmm_mc()
86 /* Nop everywhere except on alpha. */
87 #ifndef cmm_read_barrier_depends
88 #define cmm_read_barrier_depends()
93 #define cmm_smp_mb() cmm_mb()
96 #define cmm_smp_rmb() cmm_rmb()
99 #define cmm_smp_wmb() cmm_wmb()
102 #define cmm_smp_mc() cmm_mc()
105 #define cmm_smp_rmc() cmm_rmc()
108 #define cmm_smp_wmc() cmm_wmc()
110 #ifndef cmm_smp_read_barrier_depends
111 #define cmm_smp_read_barrier_depends() cmm_read_barrier_depends()
115 #define cmm_smp_mb() cmm_barrier()
118 #define cmm_smp_rmb() cmm_barrier()
121 #define cmm_smp_wmb() cmm_barrier()
124 #define cmm_smp_mc() cmm_barrier()
127 #define cmm_smp_rmc() cmm_barrier()
130 #define cmm_smp_wmc() cmm_barrier()
132 #ifndef cmm_smp_read_barrier_depends
133 #define cmm_smp_read_barrier_depends()
137 #ifndef caa_cpu_relax
138 #define caa_cpu_relax() cmm_barrier()
141 #ifndef HAS_CAA_GET_CYCLES
142 #define HAS_CAA_GET_CYCLES
144 #if defined(__APPLE__)
146 #include <mach/mach.h>
147 #include <mach/clock.h>
148 #include <mach/mach_time.h>
152 typedef uint64_t caa_cycles_t
;
154 static inline caa_cycles_t
caa_get_cycles (void)
156 mach_timespec_t ts
= { 0, 0 };
157 static clock_serv_t clock_service
;
159 if (caa_unlikely(!clock_service
)) {
160 if (host_get_clock_service(mach_host_self(),
161 SYSTEM_CLOCK
, &clock_service
))
164 if (caa_unlikely(clock_get_time(clock_service
, &ts
)))
166 return ((uint64_t) ts
.tv_sec
* 1000000000ULL) + ts
.tv_nsec
;
169 #elif defined(CONFIG_RCU_HAVE_CLOCK_GETTIME)
174 typedef uint64_t caa_cycles_t
;
176 static inline caa_cycles_t
caa_get_cycles (void)
180 if (caa_unlikely(clock_gettime(CLOCK_MONOTONIC
, &ts
)))
182 return ((uint64_t) ts
.tv_sec
* 1000000000ULL) + ts
.tv_nsec
;
187 #error caa_get_cycles() not implemented for this platform.
191 #endif /* HAS_CAA_GET_CYCLES */
197 #endif /* _URCU_ARCH_GENERIC_H */