6283b7d01b
and change the u_int mtx_saveintr member of struct mtx to a critical_t
mtx_savecrit.
- On the alpha we no longer need a custom _get_spin_lock() macro to avoid
an extra PAL call, so remove it.
- Partially fix using mutexes with WITNESS in modules. Change all the
_mtx_{un,}lock_{spin,}_flags() macros to accept explicit file and line
parameters and rename them to use a prefix of two underscores. Inside
of kern_mutex.c, generate wrapper functions for
_mtx_{un,}lock_{spin,}_flags() (only using a prefix of one underscore)
that are called from modules. The macros mtx_{un,}lock_{spin,}_flags()
are mapped to the __mtx_* macros inside of the kernel to inline the
usual case of mutex operations and map to the internal _mtx_* functions
in the module case so that modules will use WITNESS and KTR logging if
the kernel is compiled with support for it.
81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
/*-
|
|
* 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
|
|
|
|
#define mtx_intr_enable(mutex) (mutex)->mtx_savecrit |= 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 */
|