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
  13 static inline void eieio(void)
  14 {
  15         __asm__ __volatile__ ("eieio" : : : "memory");
  16 }
  17
  18 static inline void isync(void)
  19 {
  20         __asm__ __volatile__ ("isync" : : : "memory");
  21 }
  22 #endif /* __ASSEMBLY__ */
  23
  24 #if defined(__powerpc64__)
  25 #    define LWSYNC      lwsync
  26 #elif defined(CONFIG_E500)
  27 #    define LWSYNC                                      \
  28         START_LWSYNC_SECTION(96);                       \
  29         sync;                                           \
  30         MAKE_LWSYNC_SECTION_ENTRY(96, __lwsync_fixup);
  31 #else
  32 #    define LWSYNC      sync
  33 #endif
  34
  35 #ifdef CONFIG_SMP
  36 #define __PPC_ACQUIRE_BARRIER                           \
  37         START_LWSYNC_SECTION(97);                       \
  38         isync;                                          \
  39         MAKE_LWSYNC_SECTION_ENTRY(97, __lwsync_fixup);
  40 #define PPC_ACQUIRE_BARRIER      "\n" stringify_in_c(__PPC_ACQUIRE_BARRIER)
  41 #define PPC_RELEASE_BARRIER      stringify_in_c(LWSYNC) "\n"
  42 #define PPC_ATOMIC_ENTRY_BARRIER "\n" stringify_in_c(sync) "\n"
  43 #define PPC_ATOMIC_EXIT_BARRIER  "\n" stringify_in_c(sync) "\n"
  44 #else
  45 #define PPC_ACQUIRE_BARRIER
  46 #define PPC_RELEASE_BARRIER
  47 #define PPC_ATOMIC_ENTRY_BARRIER
  48 #define PPC_ATOMIC_EXIT_BARRIER
  49 #endif
  50
  51 #endif /* __KERNEL__ */
  52 #endif  /* _ASM_POWERPC_SYNCH_H */