GNU Linux-libre 4.4.296-gnu1
[releases.git] / arch / powerpc / include / asm / synch.h
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 #ifndef __ASSEMBLY__
9 extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup;
10 extern void do_lwsync_fixups(unsigned long value, void *fixup_start,
11                              void *fixup_end);
12 extern void do_final_fixups(void);
13
14 static inline void eieio(void)
15 {
16         __asm__ __volatile__ ("eieio" : : : "memory");
17 }
18
19 static inline void isync(void)
20 {
21         __asm__ __volatile__ ("isync" : : : "memory");
22 }
23 #endif /* __ASSEMBLY__ */
24
25 #if defined(__powerpc64__)
26 #    define LWSYNC      lwsync
27 #elif defined(CONFIG_E500)
28 #    define LWSYNC                                      \
29         START_LWSYNC_SECTION(96);                       \
30         sync;                                           \
31         MAKE_LWSYNC_SECTION_ENTRY(96, __lwsync_fixup);
32 #else
33 #    define LWSYNC      sync
34 #endif
35
36 #ifdef CONFIG_SMP
37 #define __PPC_ACQUIRE_BARRIER                           \
38         START_LWSYNC_SECTION(97);                       \
39         isync;                                          \
40         MAKE_LWSYNC_SECTION_ENTRY(97, __lwsync_fixup);
41 #define PPC_ACQUIRE_BARRIER      "\n" stringify_in_c(__PPC_ACQUIRE_BARRIER)
42 #define PPC_RELEASE_BARRIER      stringify_in_c(LWSYNC) "\n"
43 #define PPC_ATOMIC_ENTRY_BARRIER "\n" stringify_in_c(sync) "\n"
44 #define PPC_ATOMIC_EXIT_BARRIER  "\n" stringify_in_c(sync) "\n"
45 #else
46 #define PPC_ACQUIRE_BARRIER
47 #define PPC_RELEASE_BARRIER
48 #define PPC_ATOMIC_ENTRY_BARRIER
49 #define PPC_ATOMIC_EXIT_BARRIER
50 #endif
51
52 #endif /* __KERNEL__ */
53 #endif  /* _ASM_POWERPC_SYNCH_H */