cmm: let per-arch files provide cmm_smp_* barriers
[urcu.git] / urcu / arch / x86.h
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1#ifndef _URCU_ARCH_X86_H
2#define _URCU_ARCH_X86_H
121a5d44 3
6d0ce021 4/*
af02d47e 5 * arch_x86.h: trivial definitions for the x86 architecture.
6d0ce021 6 *
af02d47e 7 * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
6982d6d7 8 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6d0ce021 9 *
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10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
05dd4b94 14 *
af02d47e 15 * This library is distributed in the hope that it will be useful,
6d0ce021 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
6d0ce021 19 *
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20 * You should have received a copy of the GNU Lesser General Public
21 * License along with this library; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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23 */
24
ec4e58a3 25#include <urcu/compiler.h>
c96a3726 26#include <urcu/config.h>
121a5d44 27
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28#ifdef __cplusplus
29extern "C" {
30#endif
31
06f22bdb 32#define CAA_CACHE_LINE_SIZE 128
b4e52e3e 33
02be5561 34#ifdef CONFIG_RCU_HAVE_FENCE
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35#define cmm_mb() asm volatile("mfence":::"memory")
36#define cmm_rmb() asm volatile("lfence":::"memory")
37#define cmm_wmb() asm volatile("sfence"::: "memory")
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38#else
39/*
5481ddb3 40 * Some non-Intel clones support out of order store. cmm_wmb() ceases to be a
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41 * nop for these.
42 */
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43#define cmm_mb() asm volatile("lock; addl $0,0(%%esp)":::"memory")
44#define cmm_rmb() asm volatile("lock; addl $0,0(%%esp)":::"memory")
45#define cmm_wmb() asm volatile("lock; addl $0,0(%%esp)"::: "memory")
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46#endif
47
06f22bdb 48#define caa_cpu_relax() asm volatile("rep; nop" : : : "memory");
6d0ce021 49
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50#define rdtscll(val) \
51 do { \
52 unsigned int __a, __d; \
53 asm volatile("rdtsc" : "=a" (__a), "=d" (__d)); \
54 (val) = ((unsigned long long)__a) \
55 | (((unsigned long long)__d) << 32); \
56 } while(0)
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57
58typedef unsigned long long cycles_t;
59
06f22bdb 60static inline cycles_t caa_get_cycles(void)
6d0ce021 61{
af02d47e 62 cycles_t ret = 0;
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63
64 rdtscll(ret);
65 return ret;
66}
121a5d44 67
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68#ifdef __cplusplus
69}
70#endif
71
1b9119f8 72#include <urcu/arch/generic.h>
e4d1eb09 73
ec4e58a3 74#endif /* _URCU_ARCH_X86_H */
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