Date: Mon, 20 May 1996 19:14:28 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: jmz@cabri.obs-besancon.fr (Jean-Marc Zucconi) Cc: coredump@nervosa.com, freebsd-current@freebsd.org, dyson@freebsd.org Subject: Re: VM changes Message-ID: <199605210014.TAA00163@dyson.iquest.net> In-Reply-To: <9605210032.AA23672@cabri.obs-besancon.fr> from "Jean-Marc Zucconi" at May 21, 96 01:32:57 am
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> > You are lucky :-) My machine crashed after an uptime of only one > hour. It was not very loaded (make world in a xterm, a compilation in > another and emacs) The pointer disapeared and the machine > freezed. I had to hit the reset button. > I was not able to make it to crash again though. I restarted the make > world and a few compiles, watching my xconsole, but everything > completed fine. > It is possible that a small bug remains (unless the crash was caused > by a cosmic ray :-)) > Just a a long-shot, try this /sys/i386/include/spl.h, with a modified definition of splvm(): /*- * Copyright (c) 1993 The Regents of the University of California. * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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. * * $Id: spl.h,v 1.14 1996/05/18 03:36:42 dyson Exp $ */ #ifndef _MACHINE_IPL_H_ #define _MACHINE_IPL_H_ #include <machine/ipl.h> /* XXX "machine" means cpu for i386 */ /* * Software interrupt bit numbers in priority order. The priority only * determines which swi will be dispatched next; a higher priority swi * may be dispatched when a nested h/w interrupt handler returns. */ #define SWI_TTY (NHWI + 0) #define SWI_NET (NHWI + 1) #define SWI_CLOCK 30 #define SWI_AST 31 /* * Corresponding interrupt-pending bits for ipending. */ #define SWI_TTY_PENDING (1 << SWI_TTY) #define SWI_NET_PENDING (1 << SWI_NET) #define SWI_CLOCK_PENDING (1 << SWI_CLOCK) #define SWI_AST_PENDING (1 << SWI_AST) /* * Corresponding interrupt-disable masks for cpl. The ordering is now by * inclusion (where each mask is considered as a set of bits). Everything * except SWI_AST_MASK includes SWI_CLOCK_MASK so that softclock() doesn't * run while other swi handlers are running and timeout routines can call * swi handlers. Everything includes SWI_AST_MASK so that AST's are masked * until just before return to user mode. SWI_TTY_MASK includes SWI_NET_MASK * in case tty interrupts are processed at splsofttty() for a tty that is in * SLIP or PPP line discipline (this is weaker than merging net_imask with * tty_imask in isa.c - splimp() must mask hard and soft tty interrupts, but * spltty() apparently only needs to mask soft net interrupts). */ #define SWI_TTY_MASK (SWI_TTY_PENDING | SWI_CLOCK_MASK | SWI_NET_MASK) #define SWI_NET_MASK (SWI_NET_PENDING | SWI_CLOCK_MASK) #define SWI_CLOCK_MASK (SWI_CLOCK_PENDING | SWI_AST_MASK) #define SWI_AST_MASK SWI_AST_PENDING #define SWI_MASK (~HWI_MASK) #ifndef LOCORE extern unsigned bio_imask; /* group of interrupts masked with splbio() */ extern unsigned cpl; /* current priority level mask */ extern volatile unsigned idelayed; /* interrupts to become pending */ extern volatile unsigned ipending; /* active interrupts masked by cpl */ extern unsigned net_imask; /* group of interrupts masked with splimp() */ extern unsigned stat_imask; /* interrupts masked with splstatclock() */ extern unsigned tty_imask; /* group of interrupts masked with spltty() */ /* * ipending has to be volatile so that it is read every time it is accessed * in splx() and spl0(), but we don't want it to be read nonatomically when * it is changed. Pretending that ipending is a plain int happens to give * suitable atomic code for "ipending |= constant;". */ #define setdelayed() (*(unsigned *)&ipending |= loadandclear(&idelayed)) #define setsoftast() (*(unsigned *)&ipending |= SWI_AST_PENDING) #define setsoftclock() (*(unsigned *)&ipending |= SWI_CLOCK_PENDING) #define setsoftnet() (*(unsigned *)&ipending |= SWI_NET_PENDING) #define setsofttty() (*(unsigned *)&ipending |= SWI_TTY_PENDING) #define schedsofttty() (*(unsigned *)&idelayed |= SWI_TTY_PENDING) #define schedsoftnet() (*(unsigned *)&idelayed |= SWI_NET_PENDING) #define softclockpending() (ipending & SWI_CLOCK_PENDING) #ifdef __GNUC__ void splz __P((void)); #define GENSPL(name, set_cpl) \ static __inline int name(void) \ { \ unsigned x; \ \ __asm __volatile("" : : : "memory"); \ x = cpl; \ set_cpl; \ return (x); \ } GENSPL(splbio, cpl |= bio_imask) GENSPL(splclock, cpl = HWI_MASK | SWI_MASK) GENSPL(splhigh, cpl = HWI_MASK | SWI_MASK) GENSPL(splimp, cpl |= net_imask) GENSPL(splnet, cpl |= SWI_NET_MASK) GENSPL(splsoftclock, cpl = SWI_CLOCK_MASK) GENSPL(splsofttty, cpl |= SWI_TTY_MASK) GENSPL(splstatclock, cpl |= stat_imask) GENSPL(spltty, cpl |= tty_imask) /* GENSPL(splvm, cpl |= net_imask | bio_imask) */ GENSPL(splvm, cpl = HWI_MASK | SWI_MASK) static __inline void spl0(void) { cpl = SWI_AST_MASK; if (ipending & ~SWI_AST_MASK) splz(); } static __inline void splx(int ipl) { cpl = ipl; if (ipending & ~ipl) splz(); } #endif /* __GNUC__ */ #endif /* !LOCORE */ #endif /* !_MACHINE_IPL_H_ */
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