/* * This file is part of the coreboot project. * * Copyright 2014 Google Inc. * Copyright (C) 2003-2004 Olivier Houchard * Copyright (C) 1994-1997 Mark Brinicombe * Copyright (C) 1994 Brini * All rights reserved. * * This code is derived from software written for Brini by Mark Brinicombe * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * */ #ifndef __ARCH_BARRIER_H_ #define __ARCH_BARRIER_H__ #include <arch/cache.h> /* * Description of different memory barriers introduced: * * Memory barrier(mb) - Guarantees that all memory accesses specified before the * barrier will happen before all memory accesses specified after the barrier * * Read memory barrier (rmb) - Guarantees that all read memory accesses * specified before the barrier will happen before all read memory accesses * specified after the barrier * * Write memory barrier (wmb) - Guarantees that all write memory accesses * specified before the barrier will happen before all write memory accesses * specified after the barrier */ /* * According to ARMv8 Instruction Set Overview: * Options specified to dmb instruction have the following meaning: * Option Ordered accesses * sy any-any * ld load-load, load-store * st store-store */ #define mb() dmb_opt(sy) #define rmb() dmb_opt(ld) #define wmb() dmb_opt(st) #endif /* __ARCH_BARRIER_H__ */