1/* $NetBSD: membar_ops.S,v 1.6 2008/05/25 15:56:11 chs Exp $ */ 2 3/*- 4 * Copyright (c) 2006, 2007 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include "atomic_op_asm.h" 33 34 .text 35 36#ifdef _KERNEL 37 38/* 39 * We start out with no-op versions that do nothing. We hot-patch when 40 * we detect a MP system. 41 */ 42LEAF(_membar_producer, 0) 43 RET 44 nop 45 END(_membar_producer) 46EXPORT(_membar_producer_end) 47 48LEAF(_membar_sync, 0) 49 RET 50 nop 51 END(_membar_sync) 52EXPORT(_membar_sync_end) 53 54LEAF(_membar_producer_mp, 0) 55 wmb 56 RET 57 END(_membar_producer_mp) 58EXPORT(_membar_producer_mp_end) 59 60LEAF(_membar_sync_mp, 0) 61 mb 62 RET 63 END(_membar_sync_mp) 64EXPORT(_membar_sync_mp_end) 65 66#else /* _KERNEL */ 67 68LEAF(_membar_producer, 0) 69 mb 70 RET 71 END(_membar_producer) 72EXPORT(_membar_producer_end) 73 74LEAF(_membar_sync, 0) 75 mb 76 RET 77 END(_membar_sync) 78EXPORT(_membar_sync_end) 79 80#endif /* _KERNEL */ 81 82ATOMIC_OP_ALIAS(membar_producer,_membar_producer) 83ATOMIC_OP_ALIAS(membar_sync,_membar_sync) 84ATOMIC_OP_ALIAS(membar_enter,_membar_sync) 85STRONG_ALIAS(_membar_enter,_membar_sync) 86ATOMIC_OP_ALIAS(membar_exit,_membar_sync) 87STRONG_ALIAS(_membar_exit,_membar_sync) 88ATOMIC_OP_ALIAS(membar_consumer,_membar_sync) 89STRONG_ALIAS(_membar_consumer,_membar_sync) 90