nmi.c revision 330897 
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 * 4. 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 *	from: @(#)isa.c	7.2 (Berkeley) 5/13/91
35 */
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: stable/11/sys/x86/isa/nmi.c 330897 2018-03-14 03:19:51Z eadler $");
39
40#include "opt_mca.h"
41
42#include <sys/types.h>
43#include <sys/syslog.h>
44#include <sys/systm.h>
45
46#include <machine/md_var.h>
47
48#ifdef DEV_MCA
49#include <i386/bios/mca_machdep.h>
50#endif
51
52#define NMI_PARITY (1 << 7)
53#define NMI_IOCHAN (1 << 6)
54#define ENMI_WATCHDOG (1 << 7)
55#define ENMI_BUSTIMER (1 << 6)
56#define ENMI_IOSTATUS (1 << 5)
57
58/*
59 * Handle a NMI, possibly a machine check.
60 * return true to panic system, false to ignore.
61 */
62int
63isa_nmi(int cd)
64{
65	int retval = 0;
66	int isa_port = inb(0x61);
67	int eisa_port = inb(0x461);
68
69	log(LOG_CRIT, "NMI ISA %x, EISA %x\n", isa_port, eisa_port);
70#ifdef DEV_MCA
71	if (MCA_system && mca_bus_nmi())
72		return(0);
73#endif
74
75	if (isa_port & NMI_PARITY) {
76		log(LOG_CRIT, "RAM parity error, likely hardware failure.");
77		retval = 1;
78	}
79
80	if (isa_port & NMI_IOCHAN) {
81		log(LOG_CRIT, "I/O channel check, likely hardware failure.");
82		retval = 1;
83	}
84
85	/*
86	 * On a real EISA machine, this will never happen.  However it can
87	 * happen on ISA machines which implement XT style floating point
88	 * error handling (very rare).  Save them from a meaningless panic.
89	 */
90	if (eisa_port == 0xff)
91		return(retval);
92
93	if (eisa_port & ENMI_WATCHDOG) {
94		log(LOG_CRIT, "EISA watchdog timer expired, likely hardware failure.");
95		retval = 1;
96	}
97
98	if (eisa_port & ENMI_BUSTIMER) {
99		log(LOG_CRIT, "EISA bus timeout, likely hardware failure.");
100		retval = 1;
101	}
102
103	if (eisa_port & ENMI_IOSTATUS) {
104		log(LOG_CRIT, "EISA I/O port status error.");
105		retval = 1;
106	}
107
108	return(retval);
109}
110