The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/nmi.c

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    1 /*-
    2  * Copyright (c) 1991 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)isa.c 7.2 (Berkeley) 5/13/91
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/6.4/sys/i386/isa/nmi.c 128019 2004-04-07 20:46:16Z imp $");
   37 
   38 #include "opt_mca.h"
   39 
   40 #include <sys/types.h>
   41 #include <sys/syslog.h>
   42 #include <sys/systm.h>
   43 
   44 #include <machine/md_var.h>
   45 
   46 #ifdef DEV_MCA
   47 #include <i386/bios/mca_machdep.h>
   48 #endif
   49 
   50 #define NMI_PARITY (1 << 7)
   51 #define NMI_IOCHAN (1 << 6)
   52 #define ENMI_WATCHDOG (1 << 7)
   53 #define ENMI_BUSTIMER (1 << 6)
   54 #define ENMI_IOSTATUS (1 << 5)
   55 
   56 /*
   57  * Handle a NMI, possibly a machine check.
   58  * return true to panic system, false to ignore.
   59  */
   60 int
   61 isa_nmi(int cd)
   62 {
   63         int retval = 0;
   64         int isa_port = inb(0x61);
   65         int eisa_port = inb(0x461);
   66 
   67         log(LOG_CRIT, "NMI ISA %x, EISA %x\n", isa_port, eisa_port);
   68 #ifdef DEV_MCA
   69         if (MCA_system && mca_bus_nmi())
   70                 return(0);
   71 #endif
   72         
   73         if (isa_port & NMI_PARITY) {
   74                 log(LOG_CRIT, "RAM parity error, likely hardware failure.");
   75                 retval = 1;
   76         }
   77 
   78         if (isa_port & NMI_IOCHAN) {
   79                 log(LOG_CRIT, "I/O channel check, likely hardware failure.");
   80                 retval = 1;
   81         }
   82 
   83         /*
   84          * On a real EISA machine, this will never happen.  However it can
   85          * happen on ISA machines which implement XT style floating point
   86          * error handling (very rare).  Save them from a meaningless panic.
   87          */
   88         if (eisa_port == 0xff)
   89                 return(retval);
   90 
   91         if (eisa_port & ENMI_WATCHDOG) {
   92                 log(LOG_CRIT, "EISA watchdog timer expired, likely hardware failure.");
   93                 retval = 1;
   94         }
   95 
   96         if (eisa_port & ENMI_BUSTIMER) {
   97                 log(LOG_CRIT, "EISA bus timeout, likely hardware failure.");
   98                 retval = 1;
   99         }
  100 
  101         if (eisa_port & ENMI_IOSTATUS) {
  102                 log(LOG_CRIT, "EISA I/O port status error.");
  103                 retval = 1;
  104         }
  105 
  106         return(retval);
  107 }

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