1 /* $NetBSD: mutex.h,v 1.3 2007/11/21 10:19:06 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 2002, 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 and Andrew Doran. 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 #ifndef _ALPHA_MUTEX_H_ 40 #define _ALPHA_MUTEX_H_ 41 42 #ifndef __MUTEX_PRIVATE 43 44 struct kmutex { 45 uintptr_t mtx_pad1; 46 uint32_t mtx_pad2; 47 }; 48 49 #else /* __MUTEX_PRIVATE */ 50 51 struct kmutex { 52 union { 53 volatile uintptr_t mtxa_owner; 54 struct { 55 volatile uint8_t mtxs_flags; 56 ipl_cookie_t mtxs_ipl; 57 volatile uint16_t mtxs_unused; 58 } s; 59 } u; 60 __cpu_simple_lock_t mtx_lock; 61 }; 62 63 #define mtx_owner u.mtxa_owner 64 #define mtx_flags u.s.mtxs_flags 65 #define mtx_ipl u.s.mtxs_ipl 66 67 #define __HAVE_SIMPLE_MUTEXES 1 68 #define __HAVE_MUTEX_STUBS 1 69 70 #define MUTEX_RECEIVE(mtx) mb_read() 71 #define MUTEX_GIVE(mtx) mb_memory() 72 73 #define MUTEX_CAS(p, o, n) _lock_cas((p), (o), (n)) 74 75 int _lock_cas(volatile uintptr_t *, uintptr_t, uintptr_t); 76 77 #endif /* __MUTEX_PRIVATE */ 78 79 #endif /* _ALPHA_MUTEX_H_ */ 80