LXR linux/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__
  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(LWSYNC) "\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