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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _ASM_POWERPC_SYNCH_H
2#define _ASM_POWERPC_SYNCH_H
3
4#include <linux/config.h>
5
6#ifdef __powerpc64__
7#define __SUBARCH_HAS_LWSYNC
8#endif
9
10#ifdef __SUBARCH_HAS_LWSYNC
11# define LWSYNC lwsync
12#else
13# define LWSYNC sync
14#endif
15
16
17/*
18 * Arguably the bitops and *xchg operations don't imply any memory barrier
19 * or SMP ordering, but in fact a lot of drivers expect them to imply
20 * both, since they do on x86 cpus.
21 */
22#ifdef CONFIG_SMP
23#define EIEIO_ON_SMP "eieio\n"
24#define ISYNC_ON_SMP "\n\tisync"
25#define SYNC_ON_SMP __stringify(LWSYNC) "\n"
26#else
27#define EIEIO_ON_SMP
28#define ISYNC_ON_SMP
29#define SYNC_ON_SMP
30#endif
31
32static inline void eieio(void)
33{
34 __asm__ __volatile__ ("eieio" : : : "memory");
35}
36
37static inline void isync(void)
38{
39 __asm__ __volatile__ ("isync" : : : "memory");
40}
41
42#ifdef CONFIG_SMP
43#define eieio_on_smp() eieio()
44#define isync_on_smp() isync()
45#else
46#define eieio_on_smp() __asm__ __volatile__("": : :"memory")
47#define isync_on_smp() __asm__ __volatile__("": : :"memory")
48#endif
49
50#endif /* _ASM_POWERPC_SYNCH_H */
51