barrier.h

Go to the documentation of this file.

/* Generic barrier definitions, based on MN10300 definitions.
 *
 * It should be possible to use these on really simple architectures,
 * but it serves more as a starting point for new ports.
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#ifndef __ASM_GENERIC_BARRIER_H
#define __ASM_GENERIC_BARRIER_H

#ifndef __ASSEMBLY__

#define nop() asm volatile ("nop")

/*
 * Force strict CPU ordering.
 * And yes, this is required on UP too when we're talking
 * to devices.
 *
 * This implementation only contains a compiler barrier.
 */

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

#ifdef CONFIG_SMP
#define smp_mb()    mb()
#define smp_rmb()   rmb()
#define smp_wmb()   wmb()
#else
#define smp_mb()    barrier()
#define smp_rmb()   barrier()
#define smp_wmb()   barrier()
#endif

#define set_mb(var, value)  do { var = value;  mb(); } while (0)
#define set_wmb(var, value) do { var = value; wmb(); } while (0)

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

#endif /* !__ASSEMBLY__ */
#endif /* __ASM_GENERIC_BARRIER_H */