82 lines
2.7 KiB
C
82 lines
2.7 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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#include <machine/ia64_cpu.h>
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#ifndef LOCORE
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#ifdef _KERNEL
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#define mtx_legal2block() (ia64_get_psr() & IA64_PSR_I)
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#define mtx_intr_enable(mutex) (mutex)->mtx_saveintr |= IA64_PSR_I
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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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#define MTX_ENTER(lck, rPSR, rOLD, rNEW, rLCK) \
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mov rPSR=psr ; \
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mov rNEW=globalp ; \
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addl rLCK=@ltoff(lck),gp ;; \
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ld8 rLCK=[rLCK] ;; \
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add rLCK=MTX_LOCK,rLCK ;; \
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rsm psr.i ; \
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mov ar.ccv=MTX_UNOWNED ; \
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add rNEW=PC_CURPROC,rNEW ;; \
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ld8 rNEW=[rNEW] ;; \
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1: cmpxchg8.acq rOLD=[rLCK],rNEW,ar.ccv ;; \
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cmp.eq p1,p0=MTX_UNOWNED,rOLD ;; \
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(p1) br.cond.spnt.few 1b ;; \
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addl rLCK=@ltoff(lck),gp ;; \
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ld8 rLCK=[rLCK] ;; \
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add rLCK=MTX_SAVEINTR,rLCK ;; \
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st4 [rLCK]=rPSR
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#define MTX_EXIT(lck, rTMP, rLCK) \
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mov rTMP=MTX_UNOWNED ; \
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addl rLCK=@ltoff(lck),gp;; \
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ld8 rLCK=[rLCK];; \
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add rLCK=MTX_LOCK,rLCK;; \
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st8.rel [rLCK]=rTMP,MTX_SAVEINTR-MTX_LOCK ;; \
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ld4 rTMP=[rLCK] ;; \
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mov psr.l=rTMP ;; \
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srlz.d
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#endif /* !LOCORE */
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#endif /* __MACHINE_MUTEX_H */
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