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 */
51 int
isa_nmi(int cd)52 isa_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