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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#include <urcu/syscall-compat.h>
27
28#ifdef __cplusplus
29extern "C" {
30#endif
31
32#ifndef CAA_CACHE_LINE_SIZE
33#define CAA_CACHE_LINE_SIZE 64
34#endif
35
36#if !defined(cmm_mc) && !defined(cmm_rmc) && !defined(cmm_wmc)
37#define CONFIG_HAVE_MEM_COHERENCY
38/*
39 * Architectures with cache coherency must _not_ define cmm_mc/cmm_rmc/cmm_wmc.
40 *
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).
44 */
45
46#ifndef cmm_mb
47#define cmm_mb() __sync_synchronize()
48#endif
49
50#ifndef cmm_rmb
51#define cmm_rmb() cmm_mb()
52#endif
53
54#ifndef cmm_wmb
55#define cmm_wmb() cmm_mb()
56#endif
57
58#define cmm_mc() cmm_barrier()
59#define cmm_rmc() cmm_barrier()
60#define cmm_wmc() cmm_barrier()
61#else
62/*
63 * Architectures without cache coherency need something like the following:
64 *
65 * #define cmm_mc() arch_cache_flush()
66 * #define cmm_rmc() arch_cache_flush_read()
67 * #define cmm_wmc() arch_cache_flush_write()
68 *
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:
71 *
72 * #define cmm_mb() cmm_mc()
73 * #define cmm_rmb() cmm_rmc()
74 * #define cmm_wmb() cmm_wmc()
75 */
76
77#ifndef cmm_mb
78#define cmm_mb() cmm_mc()
79#endif
80
81#ifndef cmm_rmb
82#define cmm_rmb() cmm_rmc()
83#endif
84
85#ifndef cmm_wmb
86#define cmm_wmb() cmm_wmc()
87#endif
88
89#ifndef cmm_rmc
90#define cmm_rmc() cmm_mc()
91#endif
92
93#ifndef cmm_wmc
94#define cmm_wmc() cmm_mc()
95#endif
96#endif
97
98/* Nop everywhere except on alpha. */
99#ifndef cmm_read_barrier_depends
100#define cmm_read_barrier_depends()
101#endif
102
103#ifdef CONFIG_RCU_SMP
104#ifndef cmm_smp_mb
105#define cmm_smp_mb() cmm_mb()
106#endif
107#ifndef cmm_smp_rmb
108#define cmm_smp_rmb() cmm_rmb()
109#endif
110#ifndef cmm_smp_wmb
111#define cmm_smp_wmb() cmm_wmb()
112#endif
113#ifndef cmm_smp_mc
114#define cmm_smp_mc() cmm_mc()
115#endif
116#ifndef cmm_smp_rmc
117#define cmm_smp_rmc() cmm_rmc()
118#endif
119#ifndef cmm_smp_wmc
120#define cmm_smp_wmc() cmm_wmc()
121#endif
122#ifndef cmm_smp_read_barrier_depends
123#define cmm_smp_read_barrier_depends() cmm_read_barrier_depends()
124#endif
125#else
126#ifndef cmm_smp_mb
127#define cmm_smp_mb() cmm_barrier()
128#endif
129#ifndef cmm_smp_rmb
130#define cmm_smp_rmb() cmm_barrier()
131#endif
132#ifndef cmm_smp_wmb
133#define cmm_smp_wmb() cmm_barrier()
134#endif
135#ifndef cmm_smp_mc
136#define cmm_smp_mc() cmm_barrier()
137#endif
138#ifndef cmm_smp_rmc
139#define cmm_smp_rmc() cmm_barrier()
140#endif
141#ifndef cmm_smp_wmc
142#define cmm_smp_wmc() cmm_barrier()
143#endif
144#ifndef cmm_smp_read_barrier_depends
145#define cmm_smp_read_barrier_depends()
146#endif
147#endif
148
149#ifndef caa_cpu_relax
150#define caa_cpu_relax() cmm_barrier()
151#endif
152
153#ifndef HAS_CAA_GET_CYCLES
154#define HAS_CAA_GET_CYCLES
155
156#if defined(__APPLE__)
157
158#include <mach/mach.h>
159#include <mach/clock.h>
160#include <mach/mach_time.h>
161#include <time.h>
162#include <stdint.h>
163
164typedef uint64_t caa_cycles_t;
165
166static inline caa_cycles_t caa_get_cycles (void)
167{
168 mach_timespec_t ts = { 0, 0 };
169 static clock_serv_t clock_service;
170
171 if (caa_unlikely(!clock_service)) {
172 if (host_get_clock_service(mach_host_self(),
173 SYSTEM_CLOCK, &clock_service))
174 return -1ULL;
175 }
176 if (caa_unlikely(clock_get_time(clock_service, &ts)))
177 return -1ULL;
178 return ((uint64_t) ts.tv_sec * 1000000000ULL) + ts.tv_nsec;
179}
180
181#elif defined(CONFIG_RCU_HAVE_CLOCK_GETTIME)
182
183#include <time.h>
184#include <stdint.h>
185
186typedef uint64_t caa_cycles_t;
187
188static inline caa_cycles_t caa_get_cycles (void)
189{
190 struct timespec ts;
191
192 if (caa_unlikely(clock_gettime(CLOCK_MONOTONIC, &ts)))
193 return -1ULL;
194 return ((uint64_t) ts.tv_sec * 1000000000ULL) + ts.tv_nsec;
195}
196
197#else
198
199#error caa_get_cycles() not implemented for this platform.
200
201#endif
202
203#endif /* HAS_CAA_GET_CYCLES */
204
205#ifdef __cplusplus
206}
207#endif
208
209#endif /* _URCU_ARCH_GENERIC_H */
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