arch/arm64/include/asm/vdso/compat_barrier.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2018 ARM Limited
   4  */
   5 #ifndef __COMPAT_BARRIER_H
   6 #define __COMPAT_BARRIER_H
   7
   8 #ifndef __ASSEMBLY__
   9 /*
  10  * Warning: This code is meant to be used with
  11  * ENABLE_COMPAT_VDSO only.
  12  */
  13 #ifndef ENABLE_COMPAT_VDSO
  14 #error This header is meant to be used with ENABLE_COMPAT_VDSO only
  15 #endif
  16
  17 #ifdef dmb
  18 #undef dmb
  19 #endif
  20
  21 #define dmb(option) __asm__ __volatile__ ("dmb " #option : : : "memory")
  22
  23 #if __LINUX_ARM_ARCH__ >= 8 && defined(CONFIG_AS_DMB_ISHLD)
  24 #define aarch32_smp_mb()        dmb(ish)
  25 #define aarch32_smp_rmb()       dmb(ishld)
  26 #define aarch32_smp_wmb()       dmb(ishst)
  27 #else
  28 #define aarch32_smp_mb()        dmb(ish)
  29 #define aarch32_smp_rmb()       aarch32_smp_mb()
  30 #define aarch32_smp_wmb()       dmb(ishst)
  31 #endif
  32
  33
  34 #undef smp_mb
  35 #undef smp_rmb
  36 #undef smp_wmb
  37
  38 #define smp_mb()        aarch32_smp_mb()
  39 #define smp_rmb()       aarch32_smp_rmb()
  40 #define smp_wmb()       aarch32_smp_wmb()
  41
  42 #endif /* !__ASSEMBLY__ */
  43
  44 #endif /* __COMPAT_BARRIER_H */