membar_ops.S revision 1.4
1/* $NetBSD: membar_ops.S,v 1.4 2008/02/12 18:40:28 ad 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include "atomic_op_asm.h" 40 41 .text 42 43#ifdef _KERNEL 44 45/* 46 * We start out with no-op versions that do nothing. We hot-patch when 47 * we detect a MP system. 48 */ 49LEAF_NOPROFILE(_membar_producer, 0) 50 RET 51 nop 52 END(_membar_producer) 53EXPORT(_membar_producer_end) 54 55LEAF_NOPROFILE(_membar_sync, 0) 56 RET 57 nop 58 END(_membar_sync) 59EXPORT(_membar_sync_end) 60 61LEAF_NOPROFILE(_membar_producer_mp, 0) 62 wmb 63 RET 64 END(_membar_producer_mp) 65EXPORT(_membar_producer_mp_end) 66 67LEAF_NOPROFILE(_membar_sync_mp, 0) 68 mb 69 RET 70 END(_membar_sync_mp) 71EXPORT(_membar_sync_mp_end) 72 73#else /* _KERNEL */ 74 75LEAF_NOPROFILE(_membar_producer, 0) 76 mb 77 RET 78 END(_membar_producer) 79EXPORT(_membar_producer_end) 80 81LEAF_NOPROFILE(_membar_sync, 0) 82 mb 83 RET 84 END(_membar_sync) 85EXPORT(_membar_sync_end) 86 87#endif /* _KERNEL */ 88 89ATOMIC_OP_ALIAS(membar_producer,_membar_producer) 90ATOMIC_OP_ALIAS(membar_sync,_membar_sync) 91ATOMIC_OP_ALIAS(membar_enter,_membar_sync) 92STRONG_ALIAS(_membar_enter,_membar_sync) 93ATOMIC_OP_ALIAS(membar_exit,_membar_sync) 94STRONG_ALIAS(_membar_exit,_membar_sync) 95ATOMIC_OP_ALIAS(membar_consumer,_membar_sync) 96STRONG_ALIAS(_membar_consumer,_membar_sync) 97