forked from mirrors/linux
d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
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*/
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#ifndef __ASM_BARRIER_H
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#define __ASM_BARRIER_H
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#ifdef CONFIG_ISA_ARCV2
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/*
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* ARCv2 based HS38 cores are in-order issue, but still weakly ordered
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* due to micro-arch buffering/queuing of load/store, cache hit vs. miss ...
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*
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* Explicit barrier provided by DMB instruction
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* - Operand supports fine grained load/store/load+store semantics
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* - Ensures that selected memory operation issued before it will complete
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* before any subsequent memory operation of same type
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* - DMB guarantees SMP as well as local barrier semantics
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* (asm-generic/barrier.h ensures sane smp_*mb if not defined here, i.e.
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* UP: barrier(), SMP: smp_*mb == *mb)
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* - DSYNC provides DMB+completion_of_cache_bpu_maintenance_ops hence not needed
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* in the general case. Plus it only provides full barrier.
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*/
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#define mb() asm volatile("dmb 3\n" : : : "memory")
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#define rmb() asm volatile("dmb 1\n" : : : "memory")
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#define wmb() asm volatile("dmb 2\n" : : : "memory")
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#elif !defined(CONFIG_ARC_PLAT_EZNPS) /* CONFIG_ISA_ARCOMPACT */
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/*
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* ARCompact based cores (ARC700) only have SYNC instruction which is super
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* heavy weight as it flushes the pipeline as well.
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* There are no real SMP implementations of such cores.
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*/
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#define mb() asm volatile("sync\n" : : : "memory")
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#else /* CONFIG_ARC_PLAT_EZNPS */
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#include <plat/ctop.h>
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#define mb() asm volatile (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory")
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#define rmb() asm volatile (".word %0" : : "i"(CTOP_INST_SCHD_RD) : "memory")
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#endif
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#include <asm-generic/barrier.h>
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#endif
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