FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/nmi.c
1 /*-
2 * Copyright (c) 1991 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)isa.c 7.2 (Berkeley) 5/13/91
37 */
38
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD: releng/5.2/sys/i386/isa/nmi.c 122048 2003-11-04 13:01:41Z nyan $");
41
42 #include "opt_mca.h"
43
44 #include <sys/types.h>
45 #include <sys/syslog.h>
46 #include <sys/systm.h>
47
48 #include <machine/md_var.h>
49
50 #ifdef DEV_MCA
51 #include <i386/bios/mca_machdep.h>
52 #endif
53
54 #define NMI_PARITY (1 << 7)
55 #define NMI_IOCHAN (1 << 6)
56 #define ENMI_WATCHDOG (1 << 7)
57 #define ENMI_BUSTIMER (1 << 6)
58 #define ENMI_IOSTATUS (1 << 5)
59
60 /*
61 * Handle a NMI, possibly a machine check.
62 * return true to panic system, false to ignore.
63 */
64 int
65 isa_nmi(int cd)
66 {
67 int retval = 0;
68 int isa_port = inb(0x61);
69 int eisa_port = inb(0x461);
70
71 log(LOG_CRIT, "NMI ISA %x, EISA %x\n", isa_port, eisa_port);
72 #ifdef DEV_MCA
73 if (MCA_system && mca_bus_nmi())
74 return(0);
75 #endif
76
77 if (isa_port & NMI_PARITY) {
78 log(LOG_CRIT, "RAM parity error, likely hardware failure.");
79 retval = 1;
80 }
81
82 if (isa_port & NMI_IOCHAN) {
83 log(LOG_CRIT, "I/O channel check, likely hardware failure.");
84 retval = 1;
85 }
86
87 /*
88 * On a real EISA machine, this will never happen. However it can
89 * happen on ISA machines which implement XT style floating point
90 * error handling (very rare). Save them from a meaningless panic.
91 */
92 if (eisa_port == 0xff)
93 return(retval);
94
95 if (eisa_port & ENMI_WATCHDOG) {
96 log(LOG_CRIT, "EISA watchdog timer expired, likely hardware failure.");
97 retval = 1;
98 }
99
100 if (eisa_port & ENMI_BUSTIMER) {
101 log(LOG_CRIT, "EISA bus timeout, likely hardware failure.");
102 retval = 1;
103 }
104
105 if (eisa_port & ENMI_IOSTATUS) {
106 log(LOG_CRIT, "EISA I/O port status error.");
107 retval = 1;
108 }
109
110 return(retval);
111 }
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