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 <linux/stringify.h>
   7 #include <asm/feature-fixups.h>
   8
   9 #ifndef __ASSEMBLY__
  10 extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup;
  11 extern void do_lwsync_fixups(unsigned long value, void *fixup_start,
  12                              void *fixup_end);
  13
  14 static inline void eieio(void)
  15 {
  16         __asm__ __volatile__ ("eieio" : : : "memory");
  17 }
  18
  19 static 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 */