1#ifndef _ASM_POWERPC_SYNCH_H
2#define _ASM_POWERPC_SYNCH_H
3#ifdef __KERNEL__
4
5#include <linux/stringify.h>
6#include <asm/feature-fixups.h>
7
8#if defined(__powerpc64__) || defined(CONFIG_PPC_E500MC)
9#define __SUBARCH_HAS_LWSYNC
10#endif
11
12#ifndef __ASSEMBLY__
13extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup;
14extern void do_lwsync_fixups(unsigned long value, void *fixup_start,
15			     void *fixup_end);
16extern void do_final_fixups(void);
17
18static inline void eieio(void)
19{
20	__asm__ __volatile__ ("eieio" : : : "memory");
21}
22
23static inline void isync(void)
24{
25	__asm__ __volatile__ ("isync" : : : "memory");
26}
27#endif /* __ASSEMBLY__ */
28
29#if defined(__powerpc64__)
30#    define LWSYNC	lwsync
31#elif defined(CONFIG_E500)
32#    define LWSYNC					\
33	START_LWSYNC_SECTION(96);			\
34	sync;						\
35	MAKE_LWSYNC_SECTION_ENTRY(96, __lwsync_fixup);
36#else
37#    define LWSYNC	sync
38#endif
39
40#ifdef CONFIG_SMP
41#define __PPC_ACQUIRE_BARRIER				\
42	START_LWSYNC_SECTION(97);			\
43	isync;						\
44	MAKE_LWSYNC_SECTION_ENTRY(97, __lwsync_fixup);
45#define PPC_ACQUIRE_BARRIER	 "\n" stringify_in_c(__PPC_ACQUIRE_BARRIER)
46#define PPC_RELEASE_BARRIER	 stringify_in_c(LWSYNC) "\n"
47#define PPC_ATOMIC_ENTRY_BARRIER "\n" stringify_in_c(sync) "\n"
48#define PPC_ATOMIC_EXIT_BARRIER	 "\n" stringify_in_c(sync) "\n"
49#else
50#define PPC_ACQUIRE_BARRIER
51#define PPC_RELEASE_BARRIER
52#define PPC_ATOMIC_ENTRY_BARRIER
53#define PPC_ATOMIC_EXIT_BARRIER
54#endif
55
56#endif /* __KERNEL__ */
57#endif	/* _ASM_POWERPC_SYNCH_H */
58