atomic: provide seq_cst semantics on powerpc
[urcu.git] / urcu / arch / ppc.h
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CommitLineData
1#ifndef _URCU_ARCH_PPC_H
2#define _URCU_ARCH_PPC_H
3
4/*
5 * arch_ppc.h: trivial definitions for the powerpc architecture.
6 *
7 * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
8 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 *
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.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
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
23 */
24
25#include <urcu/compiler.h>
26#include <urcu/config.h>
27
28#ifdef __cplusplus
29extern "C" {
30#endif
31
32/* Include size of POWER5+ L3 cache lines: 256 bytes */
33#define CAA_CACHE_LINE_SIZE 256
34
35#define cmm_mb() asm volatile("sync":::"memory")
36
37#define mftbl() \
38 ({ \
39 unsigned long rval; \
40 asm volatile("mftbl %0" : "=r" (rval)); \
41 rval; \
42 })
43
44#define mftbu() \
45 ({ \
46 unsigned long rval; \
47 asm volatile("mftbu %0" : "=r" (rval)); \
48 rval; \
49 })
50
51#define mftb() \
52 ({ \
53 unsigned long long rval; \
54 asm volatile("mftb %0" : "=r" (rval)); \
55 rval; \
56 })
57
58typedef unsigned long long cycles_t;
59
60#ifdef __powerpc64__
61static inline cycles_t caa_get_cycles(void)
62{
63 return (cycles_t) mftb();
64}
65#else
66static inline cycles_t caa_get_cycles(void)
67{
68 unsigned long h, l;
69
70 for (;;) {
71 h = mftbu();
72 cmm_barrier();
73 l = mftbl();
74 cmm_barrier();
75 if (mftbu() == h)
76 return (((cycles_t) h) << 32) + l;
77 }
78}
79#endif
80
81#ifdef __cplusplus
82}
83#endif
84
85#include <urcu/arch/generic.h>
86
87#endif /* _URCU_ARCH_PPC_H */
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