FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/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.
     * 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.
     *
     *      from: @(#)isa.c 7.2 (Berkeley) 5/13/91
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/5.2/sys/i386/isa/nmi.c 122048 2003-11-04 13:01:41Z nyan $");
    
    #include "opt_mca.h"
    
    #include <sys/types.h>
    #include <sys/syslog.h>
    #include <sys/systm.h>
    
    #include <machine/md_var.h>
    
    #ifdef DEV_MCA
    #include <i386/bios/mca_machdep.h>
    #endif
    
    #define NMI_PARITY (1 << 7)
    #define NMI_IOCHAN (1 << 6)
    #define ENMI_WATCHDOG (1 << 7)
    #define ENMI_BUSTIMER (1 << 6)
    #define ENMI_IOSTATUS (1 << 5)
    
    /*
     * Handle a NMI, possibly a machine check.
     * return true to panic system, false to ignore.
     */
    int
    isa_nmi(int cd)
    {
            int retval = 0;
            int isa_port = inb(0x61);
            int eisa_port = inb(0x461);
    
            log(LOG_CRIT, "NMI ISA %x, EISA %x\n", isa_port, eisa_port);
    #ifdef DEV_MCA
            if (MCA_system && mca_bus_nmi())
                    return(0);
    #endif
            
            if (isa_port & NMI_PARITY) {
                    log(LOG_CRIT, "RAM parity error, likely hardware failure.");
                    retval = 1;
            }
    
            if (isa_port & NMI_IOCHAN) {
                    log(LOG_CRIT, "I/O channel check, likely hardware failure.");
                    retval = 1;
            }
    
            /*
             * On a real EISA machine, this will never happen.  However it can
             * happen on ISA machines which implement XT style floating point
             * error handling (very rare).  Save them from a meaningless panic.
             */
            if (eisa_port == 0xff)
                    return(retval);
    
            if (eisa_port & ENMI_WATCHDOG) {
                    log(LOG_CRIT, "EISA watchdog timer expired, likely hardware failure.");
                    retval = 1;
            }
    
           if (eisa_port & ENMI_BUSTIMER) {
                   log(LOG_CRIT, "EISA bus timeout, likely hardware failure.");
                   retval = 1;
           }
   
           if (eisa_port & ENMI_IOSTATUS) {
                   log(LOG_CRIT, "EISA I/O port status error.");
                   retval = 1;
           }
   
           return(retval);
   }

Cache object: 6e2932408f262560a076d1301d20d0da