96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
/*-
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* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Berkeley Software Design Inc's name may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $
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* $FreeBSD$
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*/
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#ifndef _MACHINE_MUTEX_H_
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#define _MACHINE_MUTEX_H_
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#ifndef LOCORE
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#ifdef _KERNEL
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#define mtx_intr_enable(mutex) (mutex)->mtx_saveintr = ALPHA_PSL_IPL_0
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/*
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* Assembly macros (for internal use only)
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*--------------------------------------------------------------------------
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*/
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/*
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* Get a spin lock, handle recusion inline.
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*/
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#define _get_spin_lock(mp, tid, opts) do { \
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u_int _ipl = alpha_pal_swpipl(ALPHA_PSL_IPL_HIGH); \
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if (!_obtain_lock((mp), (tid))) { \
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if ((mp)->mtx_lock == (uintptr_t)(tid)) \
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(mp)->mtx_recurse++; \
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else \
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_mtx_lock_spin((mp), (opts), _ipl, __FILE__, \
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__LINE__); \
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} else { \
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alpha_mb(); \
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(mp)->mtx_saveintr = _ipl; \
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} \
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} while (0)
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#endif /* _KERNEL */
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#else /* !LOCORE */
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/*
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* Simple assembly macros to get and release non-recursive spin locks
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*
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* XXX: These are presently unused and cannot be used right now. Need to be
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* re-written (they are wrong). If you plan to use this and still see
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* this message, know not to unless you fix them first! :-)
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*/
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#define MTX_ENTER(lck) \
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ldiq a0, ALPHA_PSL_IPL_HIGH; \
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call_pal PAL_OSF1_swpipl; \
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1: ldq_l a0, lck+MTX_LOCK; \
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cmpeq a0, MTX_UNOWNED, a1; \
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beq a1, 1b; \
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ldq a0, PC_CURPROC(globalp); \
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stq_c a0, lck+MTX_LOCK; \
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beq a0, 1b; \
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mb; \
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stl v0, lck+MTX_SAVEINTR
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#define MTX_EXIT(lck) \
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mb; \
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ldiq a0, MTX_UNOWNED; \
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stq a0, lck+MTX_LOCK; \
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ldl a0, lck+MTX_SAVEINTR; \
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call_pal PAL_OSF1_swpipl
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#endif /* !LOCORE */
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#endif /* __MACHINE_MUTEX_H */
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