/*- * 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_ #ifdef LOCORE /* * Simple assembly macros to get and release non-recursive spin locks */ #define MTX_ENTER(lck, rPSR, rOLD, rNEW, rLCK) \ mov rPSR=psr ; \ mov rNEW=pcpup ; \ addl rLCK=@ltoff(lck),gp ;; \ ld8 rLCK=[rLCK] ;; \ add rLCK=MTX_LOCK,rLCK ;; \ rsm psr.i ; \ mov ar.ccv=MTX_UNOWNED ; \ add rNEW=PC_CURTHREAD,rNEW ;; \ ld8 rNEW=[rNEW] ;; \ 1: cmpxchg8.acq rOLD=[rLCK],rNEW,ar.ccv ;; \ cmp.eq p1,p0=MTX_UNOWNED,rOLD ;; \ (p1) br.cond.spnt.few 1b ;; \ addl rLCK=@ltoff(lck),gp ;; \ ld8 rLCK=[rLCK] ;; \ add rLCK=MTX_SAVEINTR,rLCK ;; \ st4 [rLCK]=rPSR #define MTX_EXIT(lck, rTMP, rLCK) \ mov rTMP=MTX_UNOWNED ; \ addl rLCK=@ltoff(lck),gp;; \ ld8 rLCK=[rLCK];; \ add rLCK=MTX_LOCK,rLCK;; \ st8.rel [rLCK]=rTMP,MTX_SAVEINTR-MTX_LOCK ;; \ ld4 rTMP=[rLCK] ;; \ mov psr.l=rTMP ;; \ srlz.d #endif /* !LOCORE */ #endif /* __MACHINE_MUTEX_H */