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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_
#include <machine/ia64_cpu.h>
#ifndef LOCORE
#ifdef _KERNEL
/*
* Debugging
*/
#ifdef MUTEX_DEBUG
#ifdef _KERN_MUTEX_C_
char STR_IEN[] = "psr.i";
char STR_IDIS[] = "!psr.i";
char STR_SIEN[] = "mpp->mtx_saveintr & IA64_PSR_I";
#else /* _KERN_MUTEX_C_ */
extern char STR_IEN[];
extern char STR_IDIS[];
extern char STR_SIEN[];
#endif /* _KERN_MUTEX_C_ */
#endif /* MUTEX_DEBUG */
#define ASS_IEN MPASS2((save_intr() & IA64_PSR_I), STR_IEN)
#define ASS_IDIS MPASS2(!(save_intr() & IA64_PSR_I), STR_IDIS)
#define ASS_SIEN(mpp) MPASS2(((mpp)->mtx_saveintr & IA64_PSR_I), STR_SIEN)
#define mtx_legal2block() (save_intr() & IA64_PSR_I)
#endif /* _KERNEL */
#else /* !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=globalp ; \
addl rLCK=@ltoff(lck),gp ;; \
ld8 rLCK=[rLCK] ;; \
add rLCK=MTX_LOCK,rLCK ;; \
rsm psr.i ; \
mov ar.ccv=MTX_UNOWNED ; \
add rNEW=PC_CURPROC,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 */
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