barrier.h revision 1.3.2.2
1 1.3.2.2 jdolecek /* $NetBSD: barrier.h,v 1.3.2.2 2017/12/03 11:37:45 jdolecek Exp $ */ 2 1.3.2.2 jdolecek 3 1.3.2.2 jdolecek /*- 4 1.3.2.2 jdolecek * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 1.3.2.2 jdolecek * All rights reserved. 6 1.3.2.2 jdolecek * 7 1.3.2.2 jdolecek * This code is derived from software contributed to The NetBSD Foundation 8 1.3.2.2 jdolecek * by Taylor R. Campbell. 9 1.3.2.2 jdolecek * 10 1.3.2.2 jdolecek * Redistribution and use in source and binary forms, with or without 11 1.3.2.2 jdolecek * modification, are permitted provided that the following conditions 12 1.3.2.2 jdolecek * are met: 13 1.3.2.2 jdolecek * 1. Redistributions of source code must retain the above copyright 14 1.3.2.2 jdolecek * notice, this list of conditions and the following disclaimer. 15 1.3.2.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.2.2 jdolecek * notice, this list of conditions and the following disclaimer in the 17 1.3.2.2 jdolecek * documentation and/or other materials provided with the distribution. 18 1.3.2.2 jdolecek * 19 1.3.2.2 jdolecek * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.3.2.2 jdolecek * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.3.2.2 jdolecek * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.3.2.2 jdolecek * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.3.2.2 jdolecek * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.3.2.2 jdolecek * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.3.2.2 jdolecek * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.3.2.2 jdolecek * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.3.2.2 jdolecek * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.3.2.2 jdolecek * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.3.2.2 jdolecek * POSSIBILITY OF SUCH DAMAGE. 30 1.3.2.2 jdolecek */ 31 1.3.2.2 jdolecek 32 1.3.2.2 jdolecek #ifndef _ASM_BARRIER_H_ 33 1.3.2.2 jdolecek #define _ASM_BARRIER_H_ 34 1.3.2.2 jdolecek 35 1.3.2.2 jdolecek #include <sys/atomic.h> 36 1.3.2.2 jdolecek 37 1.3.2.2 jdolecek #ifdef _KERNEL_OPT 38 1.3.2.2 jdolecek #include "opt_multiprocessor.h" 39 1.3.2.2 jdolecek #endif 40 1.3.2.2 jdolecek 41 1.3.2.2 jdolecek #define mb membar_sync 42 1.3.2.2 jdolecek #define wmb membar_producer 43 1.3.2.2 jdolecek #define rmb membar_consumer 44 1.3.2.2 jdolecek 45 1.3.2.2 jdolecek #ifdef __alpha__ /* XXX As if... */ 46 1.3.2.2 jdolecek # define read_barrier_depends membar_sync 47 1.3.2.2 jdolecek #else 48 1.3.2.2 jdolecek # define read_barrier_depends() do {} while (0) 49 1.3.2.2 jdolecek #endif 50 1.3.2.2 jdolecek 51 1.3.2.2 jdolecek #ifdef MULTIPROCESSOR 52 1.3.2.2 jdolecek # define smp_mb mb 53 1.3.2.2 jdolecek # define smp_wmb wmb 54 1.3.2.2 jdolecek # define smp_rmb rmb 55 1.3.2.2 jdolecek # define smp_read_barrier_depends read_barrier_depends 56 1.3.2.2 jdolecek #else 57 1.3.2.2 jdolecek # define smp_mb() do {} while (0) 58 1.3.2.2 jdolecek # define smp_wmb() do {} while (0) 59 1.3.2.2 jdolecek # define smp_rmb() do {} while (0) 60 1.3.2.2 jdolecek # define smp_read_barrier_depends() do {} while (0) 61 1.3.2.2 jdolecek #endif 62 1.3.2.2 jdolecek 63 1.3.2.2 jdolecek #endif /* _ASM_BARRIER_H_ */ 64
Indexes created Thu Oct 02 14:10:14 GMT 2025