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