move whether atomic byte/short exists to uatomic_arch_*.h
[urcu.git] / urcu / arch_ppc.h
... / ...
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@polymtl.ca>
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 CACHE_LINE_SIZE 256
34
35#ifndef BITS_PER_LONG
36#define BITS_PER_LONG (__SIZEOF_LONG__ * 8)
37#endif
38
39#define mb() asm volatile("sync":::"memory")
40
41/*
42 * Serialize core instruction execution. Also acts as a compiler barrier.
43 */
44#define sync_core() asm volatile("isync" : : : "memory")
45
46#define mftbl() \
47 ({ \
48 unsigned long rval; \
49 asm volatile("mftbl %0" : "=r" (rval)); \
50 rval; \
51 })
52
53#define mftbu() \
54 ({ \
55 unsigned long rval; \
56 asm volatile("mftbu %0" : "=r" (rval)); \
57 rval; \
58 })
59
60typedef unsigned long long cycles_t;
61
62static inline cycles_t get_cycles (void)
63{
64 long h, l;
65
66 for (;;) {
67 h = mftbu();
68 barrier();
69 l = mftbl();
70 barrier();
71 if (mftbu() == h)
72 return (((cycles_t) h) << 32) + l;
73 }
74}
75
76#ifdef __cplusplus
77}
78#endif
79
80#include <urcu/arch_generic.h>
81
82#endif /* _URCU_ARCH_PPC_H */
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