LXR linux/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 */
  53