barrier.h

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/*
 * Based on arch/arm/include/asm/barrier.h
 *
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_BARRIER_H
#define __ASM_BARRIER_H

#ifndef __ASSEMBLY__

#define sev()       asm volatile("sev" : : : "memory")
#define wfe()       asm volatile("wfe" : : : "memory")
#define wfi()       asm volatile("wfi" : : : "memory")

#define isb()       asm volatile("isb" : : : "memory")
#define dsb()       asm volatile("dsb sy" : : : "memory")

#define mb()        dsb()
#define rmb()       asm volatile("dsb ld" : : : "memory")
#define wmb()       asm volatile("dsb st" : : : "memory")

#ifndef CONFIG_SMP
#define smp_mb()    barrier()
#define smp_rmb()   barrier()
#define smp_wmb()   barrier()
#else
#define smp_mb()    asm volatile("dmb ish" : : : "memory")
#define smp_rmb()   asm volatile("dmb ishld" : : : "memory")
#define smp_wmb()   asm volatile("dmb ishst" : : : "memory")
#endif

#define read_barrier_depends()      do { } while(0)
#define smp_read_barrier_depends()  do { } while(0)

#define set_mb(var, value)  do { var = value; smp_mb(); } while (0)
#define nop()       asm volatile("nop");

#endif  /* __ASSEMBLY__ */

#endif  /* __ASM_BARRIER_H */