/* $OpenBSD: armv7_mutex.c,v 1.2 2013/05/09 14:27:17 patrick Exp $ */ /* * Copyright (c) 2004 Artur Grabowski <art@openbsd.org> * All rights reserved. * * 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. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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. */ #include <sys/param.h> #include <sys/mutex.h> #include <sys/systm.h> #include <machine/intr.h> #ifdef MULTIPROCESSOR #error This code needs work #endif /* rewrite with the proper lock mechanism */ /* * Single processor systems don't need any mutexes, but they need the spl * raising semantics of the mutexes. */ void mtx_init(struct mutex *mtx, int wantipl) { mtx->mtx_oldipl = 0; mtx->mtx_wantipl = wantipl; mtx->mtx_lock = 0; } void mtx_enter(struct mutex *mtx) { if (mtx->mtx_wantipl != IPL_NONE) mtx->mtx_oldipl = _splraise(mtx->mtx_wantipl); MUTEX_ASSERT_UNLOCKED(mtx); mtx->mtx_lock = 1; #ifdef DIAGNOSTIC curcpu()->ci_mutex_level++; #endif } int mtx_enter_try(struct mutex *mtx) { if (mtx->mtx_wantipl != IPL_NONE) mtx->mtx_oldipl = _splraise(mtx->mtx_wantipl); if (mtx->mtx_lock) { splx(mtx->mtx_oldipl); return 0; } mtx->mtx_lock = 1; #ifdef DIAGNOSTIC curcpu()->ci_mutex_level++; #endif return 1; } void mtx_leave(struct mutex *mtx) { MUTEX_ASSERT_LOCKED(mtx); mtx->mtx_lock = 0; #ifdef DIAGNOSTIC curcpu()->ci_mutex_level--; #endif if (mtx->mtx_wantipl != IPL_NONE) splx(mtx->mtx_oldipl); }