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