2 * Copyright (c) 1991 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
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25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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32 * from: @(#)isa.c 7.2 (Berkeley) 5/13/91
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
40 #include <sys/types.h>
41 #include <sys/syslog.h>
42 #include <sys/systm.h>
44 #include <machine/md_var.h>
47 #include <i386/bios/mca_machdep.h>
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)
57 * Handle a NMI, possibly a machine check.
58 * return true to panic system, false to ignore.
64 int isa_port = inb(0x61);
65 int eisa_port = inb(0x461);
67 log(LOG_CRIT, "NMI ISA %x, EISA %x\n", isa_port, eisa_port);
69 if (MCA_system && mca_bus_nmi())
73 if (isa_port & NMI_PARITY) {
74 log(LOG_CRIT, "RAM parity error, likely hardware failure.");
78 if (isa_port & NMI_IOCHAN) {
79 log(LOG_CRIT, "I/O channel check, likely hardware failure.");
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.
88 if (eisa_port == 0xff)
91 if (eisa_port & ENMI_WATCHDOG) {
92 log(LOG_CRIT, "EISA watchdog timer expired, likely hardware failure.");
96 if (eisa_port & ENMI_BUSTIMER) {
97 log(LOG_CRIT, "EISA bus timeout, likely hardware failure.");
101 if (eisa_port & ENMI_IOSTATUS) {
102 log(LOG_CRIT, "EISA I/O port status error.");