arch/arm64/include/asm/barrier.h

   1 /*
   2  * Based on arch/arm/include/asm/barrier.h
   3  *
   4  * Copyright (C) 2012 ARM Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 #ifndef __ASM_BARRIER_H
  19 #define __ASM_BARRIER_H
  20
  21 #ifndef __ASSEMBLY__
  22
  23 #define sev()           asm volatile("sev" : : : "memory")
  24 #define wfe()           asm volatile("wfe" : : : "memory")
  25 #define wfi()           asm volatile("wfi" : : : "memory")
  26
  27 #define isb()           asm volatile("isb" : : : "memory")
  28 #define dsb()           asm volatile("dsb sy" : : : "memory")
  29
  30 #define mb()            dsb()
  31 #define rmb()           asm volatile("dsb ld" : : : "memory")
  32 #define wmb()           asm volatile("dsb st" : : : "memory")
  33
  34 #ifndef CONFIG_SMP
  35 #define smp_mb()        barrier()
  36 #define smp_rmb()       barrier()
  37 #define smp_wmb()       barrier()
  38 #else
  39 #define smp_mb()        asm volatile("dmb ish" : : : "memory")
  40 #define smp_rmb()       asm volatile("dmb ishld" : : : "memory")
  41 #define smp_wmb()       asm volatile("dmb ishst" : : : "memory")
  42 #endif
  43
  44 #define read_barrier_depends()          do { } while(0)
  45 #define smp_read_barrier_depends()      do { } while(0)
  46
  47 #define set_mb(var, value)      do { var = value; smp_mb(); } while (0)
  48 #define nop()           asm volatile("nop");
  49
  50 #endif  /* __ASSEMBLY__ */
  51
  52 #endif  /* __ASM_BARRIER_H */