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