/*- * Copyright (c) 1997 Berkeley Software Design, Inc. 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. 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. * 3. Berkeley Software Design Inc's name may not be used to endorse or * promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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. * * from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $ * $FreeBSD$ */ #ifndef _MACHINE_MUTEX_H_ #define _MACHINE_MUTEX_H_ #ifndef LOCORE #ifdef _KERNEL #define mtx_intr_enable(mutex) (mutex)->mtx_saveintr = ALPHA_PSL_IPL_0 /* * Assembly macros (for internal use only) *-------------------------------------------------------------------------- */ /* * Get a spin lock, handle recusion inline. */ #define _get_spin_lock(mp, tid, opts) do { \ u_int _ipl = alpha_pal_swpipl(ALPHA_PSL_IPL_HIGH); \ if (!_obtain_lock((mp), (tid))) { \ if ((mp)->mtx_lock == (uintptr_t)(tid)) \ (mp)->mtx_recurse++; \ else \ _mtx_lock_spin((mp), (opts), _ipl, __FILE__, \ __LINE__); \ } else { \ alpha_mb(); \ (mp)->mtx_saveintr = _ipl; \ } \ } while (0) #endif /* _KERNEL */ #else /* !LOCORE */ /* * Simple assembly macros to get and release non-recursive spin locks * * XXX: These are presently unused and cannot be used right now. Need to be * re-written (they are wrong). If you plan to use this and still see * this message, know not to unless you fix them first! :-) */ #define MTX_ENTER(lck) \ ldiq a0, ALPHA_PSL_IPL_HIGH; \ call_pal PAL_OSF1_swpipl; \ 1: ldq_l a0, lck+MTX_LOCK; \ cmpeq a0, MTX_UNOWNED, a1; \ beq a1, 1b; \ ldq a0, PC_CURPROC(globalp); \ stq_c a0, lck+MTX_LOCK; \ beq a0, 1b; \ mb; \ stl v0, lck+MTX_SAVEINTR #define MTX_EXIT(lck) \ mb; \ ldiq a0, MTX_UNOWNED; \ stq a0, lck+MTX_LOCK; \ ldl a0, lck+MTX_SAVEINTR; \ call_pal PAL_OSF1_swpipl #endif /* !LOCORE */ #endif /* __MACHINE_MUTEX_H */