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Linux kernel mirror (for testing)
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1/*
2 * Copyright 2004-2009 Analog Devices Inc.
3 * Tony Kou (tonyko@lineo.ca)
4 *
5 * Licensed under the GPL-2 or later
6 */
7
8#ifndef _BLACKFIN_BARRIER_H
9#define _BLACKFIN_BARRIER_H
10
11#include <asm/cache.h>
12
13#define nop() __asm__ __volatile__ ("nop;\n\t" : : )
14
15/*
16 * Force strict CPU ordering.
17 */
18#ifdef CONFIG_SMP
19
20#ifdef __ARCH_SYNC_CORE_DCACHE
21/* Force Core data cache coherence */
22# define mb() do { barrier(); smp_check_barrier(); smp_mark_barrier(); } while (0)
23# define rmb() do { barrier(); smp_check_barrier(); } while (0)
24# define wmb() do { barrier(); smp_mark_barrier(); } while (0)
25# define read_barrier_depends() do { barrier(); smp_check_barrier(); } while (0)
26#else
27# define mb() barrier()
28# define rmb() barrier()
29# define wmb() barrier()
30# define read_barrier_depends() do { } while (0)
31#endif
32
33#else /* !CONFIG_SMP */
34
35#define mb() barrier()
36#define rmb() barrier()
37#define wmb() barrier()
38#define read_barrier_depends() do { } while (0)
39
40#endif /* !CONFIG_SMP */
41
42#define smp_mb() mb()
43#define smp_rmb() rmb()
44#define smp_wmb() wmb()
45#define set_mb(var, value) do { var = value; mb(); } while (0)
46#define smp_read_barrier_depends() read_barrier_depends()
47
48#endif /* _BLACKFIN_BARRIER_H */