synch.h

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#ifndef _ASM_POWERPC_SYNCH_H 
#define _ASM_POWERPC_SYNCH_H 
#ifdef __KERNEL__

#include <linux/stringify.h>
#include <asm/feature-fixups.h>

#if defined(__powerpc64__) || defined(CONFIG_PPC_E500MC)
#define __SUBARCH_HAS_LWSYNC
#endif

#ifndef __ASSEMBLY__
extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup;
extern void do_lwsync_fixups(unsigned long value, void *fixup_start,
                 void *fixup_end);
extern void do_final_fixups(void);

static inline void eieio(void)
{
    __asm__ __volatile__ ("eieio" : : : "memory");
}

static inline void isync(void)
{
    __asm__ __volatile__ ("isync" : : : "memory");
}
#endif /* __ASSEMBLY__ */

#if defined(__powerpc64__)
#    define LWSYNC  lwsync
#elif defined(CONFIG_E500)
#    define LWSYNC                  \
    START_LWSYNC_SECTION(96);           \
    sync;                       \
    MAKE_LWSYNC_SECTION_ENTRY(96, __lwsync_fixup);
#else
#    define LWSYNC  sync
#endif

#ifdef CONFIG_SMP
#define __PPC_ACQUIRE_BARRIER               \
    START_LWSYNC_SECTION(97);           \
    isync;                      \
    MAKE_LWSYNC_SECTION_ENTRY(97, __lwsync_fixup);
#define PPC_ACQUIRE_BARRIER  "\n" stringify_in_c(__PPC_ACQUIRE_BARRIER)
#define PPC_RELEASE_BARRIER  stringify_in_c(LWSYNC) "\n"
#define PPC_ATOMIC_ENTRY_BARRIER "\n" stringify_in_c(LWSYNC) "\n"
#define PPC_ATOMIC_EXIT_BARRIER  "\n" stringify_in_c(sync) "\n"
#else
#define PPC_ACQUIRE_BARRIER
#define PPC_RELEASE_BARRIER
#define PPC_ATOMIC_ENTRY_BARRIER
#define PPC_ATOMIC_EXIT_BARRIER
#endif

#endif /* __KERNEL__ */
#endif  /* _ASM_POWERPC_SYNCH_H */