FreeBSD/Linux Kernel Cross Reference
sys/amd64/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 * 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.
19 *
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
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * from: @(#)isa.c 7.2 (Berkeley) 5/13/91
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: src/sys/amd64/isa/nmi.c,v 1.80 2004/05/16 20:30:47 peter Exp $");
37
38 #include "opt_mca.h"
39
40 #include <sys/types.h>
41 #include <sys/syslog.h>
42 #include <sys/systm.h>
43
44 #include <machine/md_var.h>
45
46 #define NMI_PARITY (1 << 7)
47 #define NMI_IOCHAN (1 << 6)
48 #define ENMI_WATCHDOG (1 << 7)
49 #define ENMI_BUSTIMER (1 << 6)
50 #define ENMI_IOSTATUS (1 << 5)
51
52 /*
53 * Handle a NMI, possibly a machine check.
54 * return true to panic system, false to ignore.
55 */
56 int
57 isa_nmi(int cd)
58 {
59 int retval = 0;
60 int isa_port = inb(0x61);
61 int eisa_port = inb(0x461);
62
63 log(LOG_CRIT, "NMI ISA %x, EISA %x\n", isa_port, eisa_port);
64
65 if (isa_port & NMI_PARITY) {
66 log(LOG_CRIT, "RAM parity error, likely hardware failure.");
67 retval = 1;
68 }
69
70 if (isa_port & NMI_IOCHAN) {
71 log(LOG_CRIT, "I/O channel check, likely hardware failure.");
72 retval = 1;
73 }
74
75 /*
76 * On a real EISA machine, this will never happen. However it can
77 * happen on ISA machines which implement XT style floating point
78 * error handling (very rare). Save them from a meaningless panic.
79 */
80 if (eisa_port == 0xff)
81 return(retval);
82
83 if (eisa_port & ENMI_WATCHDOG) {
84 log(LOG_CRIT, "EISA watchdog timer expired, likely hardware failure.");
85 retval = 1;
86 }
87
88 if (eisa_port & ENMI_BUSTIMER) {
89 log(LOG_CRIT, "EISA bus timeout, likely hardware failure.");
90 retval = 1;
91 }
92
93 if (eisa_port & ENMI_IOSTATUS) {
94 log(LOG_CRIT, "EISA I/O port status error.");
95 retval = 1;
96 }
97
98 return(retval);
99 }
100 Cache object: e1c713a77135df41624f5809889bdd60
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