rculfqueue: LGPL-ize
[urcu.git] / urcu / arch_ppc.h
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
29 extern "C" {
30 #endif
31
32 /* Include size of POWER5+ L3 cache lines: 256 bytes */
33 #define CACHE_LINE_SIZE 256
34
35 #define 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 typedef unsigned long long cycles_t;
52
53 static inline cycles_t get_cycles (void)
54 {
55 long h, l;
56
57 for (;;) {
58 h = mftbu();
59 barrier();
60 l = mftbl();
61 barrier();
62 if (mftbu() == h)
63 return (((cycles_t) h) << 32) + l;
64 }
65 }
66
67 #ifdef __cplusplus
68 }
69 #endif
70
71 #include <urcu/arch_generic.h>
72
73 #endif /* _URCU_ARCH_PPC_H */
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