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