LXR linux/arch/powerpc/include/asm/synch.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_POWERPC_SYNCH_H 
   3#define _ASM_POWERPC_SYNCH_H 
   4#ifdef __KERNEL__
   5
   6#include <asm/feature-fixups.h>
   7#include <asm/asm-const.h>
   8
   9#ifndef __ASSEMBLY__
  10extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup;
  11extern void do_lwsync_fixups(unsigned long value, void *fixup_start,
  12                             void *fixup_end);
  13
  14static inline void eieio(void)
  15{
  16        __asm__ __volatile__ ("eieio" : : : "memory");
  17}
  18
  19static 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 */
  54