FreeBSD/Linux Kernel Cross Reference
sys/pc98/cbus/nmi.c

     /*-
      * Copyright (c) 1991 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
      * 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.
     * 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.
     *
     *      from: @(#)isa.c 7.2 (Berkeley) 5/13/91
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/types.h>
    #include <sys/syslog.h>
    #include <sys/systm.h>
    
    #include <machine/md_var.h>
    
    #define NMI_PARITY 0x04
    #define NMI_EPARITY 0x02
    
    /*
     * Handle a NMI, possibly a machine check.
     * return true to panic system, false to ignore.
     */
    int
    isa_nmi(int cd)
    {
            int retval = 0;
            int port = inb(0x33);
    
            log(LOG_CRIT, "NMI PC98 port = %x\n", port);
            if (port & NMI_PARITY) {
                    log(LOG_CRIT, "BASE RAM parity error, likely hardware failure.");
                    retval = 1;
            } else if (port & NMI_EPARITY) {
                    log(LOG_CRIT, "EXTENDED RAM parity error, likely hardware failure.");
                    retval = 1;
            } else {
                    log(LOG_CRIT, "\nNMI Resume ??\n");
            }
    
            return(retval);
    }

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