/* $NetBSD: mutex.h,v 1.3 2008/04/28 20:23:25 martin Exp $ */ /*- * Copyright (c) 2008 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Takayoshi Kochi. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #ifndef _IA64_MUTEX_H_ #define _IA64_MUTEX_H_ struct kmutex { union { volatile uintptr_t mtxa_owner; #ifdef __MUTEX_PRIVATE struct { volatile uint8_t mtxs_dummy; ipl_cookie_t mtxs_ipl; __cpu_simple_lock_t mtxs_lock; volatile uint8_t mtxs_unused; } s; #endif } u; }; #ifdef __MUTEX_PRIVATE /* uintptr_t */ #define mtx_owner u.mtxa_owner /* ipl_cookie_t */ #define mtx_ipl u.s.mtxs_ipl /* __cpu_simple_lock_t */ #define mtx_lock u.s.mtxs_lock /* XXX when we implement mutex_enter()/mutex_exit(), uncomment this #define __HAVE_MUTEX_STUBS 1 */ /* XXX when we implement mutex_spin_enter()/mutex_spin_exit(), uncomment this #define __HAVE_SPIN_MUTEX_STUBS 1 */ #define __HAVE_SIMPLE_MUTEXES 1 /* * MUTEX_RECEIVE: no memory barrier required, atomic_cas implies a load fence. */ #define MUTEX_RECEIVE(mtx) /* nothing */ /* * MUTEX_GIVE: no memory barrier required, as _lock_cas() will take care of it. */ #define MUTEX_GIVE(mtx) /* nothing */ #define MUTEX_CAS(ptr, old, new) \ (atomic_cas_ulong((volatile unsigned long *)(ptr), (old), (new)) == (old)) #endif /* __MUTEX_PRIVATE */ #endif /* _IA64_MUTEX_H_ */