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 #if defined(__powerpc64__) || defined(CONFIG_PPC_E500MC)
  10 #define __SUBARCH_HAS_LWSYNC
  11 #endif
  12
  13 #ifndef __ASSEMBLY__
  14 extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup;
  15 extern void do_lwsync_fixups(unsigned long value, void *fixup_start,
  16                              void *fixup_end);
  17
  18 static inline void eieio(void)
  19 {
  20         __asm__ __volatile__ ("eieio" : : : "memory");
  21 }
  22
  23 static 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(sync) "\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 */