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/*-
* 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
/*
* Debugging
*/
#define ASS_IEN MPASS2((alpha_pal_rdps() & ALPHA_PSL_IPL_MASK) \
== ALPHA_PSL_IPL_0, "ps & IPL == IPL_0")
#define ASS_IDIS MPASS2((alpha_pal_rdps() & ALPHA_PSL_IPL_MASK) \
== ALPHA_PSL_IPL_HIGH, "ps & IPL == IPL_HIGH")
#define ASS_SIEN(mpp) MPASS2((mpp)->mtx_saveintr \
== ALPHA_PSL_IPL_0, "mpp->mtx_saveintr == IPL_0")
#define mtx_legal2block() \
((alpha_pal_rdps() & ALPHA_PSL_IPL_MASK) == 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 */
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