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 * 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#ifndef _ALPHA_MUTEX_H_ 33#define _ALPHA_MUTEX_H_ 34 35#ifndef __MUTEX_PRIVATE 36 37struct kmutex { 38 uintptr_t mtx_pad1; 39 uint32_t mtx_pad2; 40}; 41 42#else /* __MUTEX_PRIVATE */ 43 44struct kmutex { 45 union { 46 volatile uintptr_t mtxa_owner; 47 struct { 48 volatile uint8_t mtxs_flags; 49 ipl_cookie_t mtxs_ipl; 50 volatile uint16_t mtxs_unused; 51 } s; 52 } u; 53 __cpu_simple_lock_t mtx_lock; 54}; 55 56#define mtx_owner u.mtxa_owner 57#define mtx_flags u.s.mtxs_flags 58#define mtx_ipl u.s.mtxs_ipl 59 60#define __HAVE_SIMPLE_MUTEXES 1 61#define __HAVE_MUTEX_STUBS 1 62 63#define MUTEX_RECEIVE(mtx) mb_read() 64#define MUTEX_GIVE(mtx) mb_memory() 65 66#define MUTEX_CAS(p, o, n) _lock_cas((p), (o), (n)) 67 68int _lock_cas(volatile uintptr_t *, uintptr_t, uintptr_t); 69 70#endif /* __MUTEX_PRIVATE */ 71 72#endif /* _ALPHA_MUTEX_H_ */ 73