nmi.c revision 121980 
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: head/sys/i386/isa/nmi.c 121980 2003-11-03 21:10:17Z jhb $");
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#ifdef PC98
55#define NMI_PARITY 0x04
56#define NMI_EPARITY 0x02
57#else
58#define NMI_PARITY (1 << 7)
59#define NMI_IOCHAN (1 << 6)
60#define ENMI_WATCHDOG (1 << 7)
61#define ENMI_BUSTIMER (1 << 6)
62#define ENMI_IOSTATUS (1 << 5)
63#endif
64
65/*
66 * Handle a NMI, possibly a machine check.
67 * return true to panic system, false to ignore.
68 */
69int
70isa_nmi(int cd)
71{
72	int retval = 0;
73#ifdef PC98
74 	int port = inb(0x33);
75
76	log(LOG_CRIT, "NMI PC98 port = %x\n", port);
77	if (epson_machine_id == 0x20)
78		epson_outb(0xc16, epson_inb(0xc16) | 0x1);
79	if (port & NMI_PARITY) {
80		log(LOG_CRIT, "BASE RAM parity error, likely hardware failure.");
81		retval = 1;
82	} else if (port & NMI_EPARITY) {
83		log(LOG_CRIT, "EXTENDED RAM parity error, likely hardware failure.");
84		retval = 1;
85	} else {
86		log(LOG_CRIT, "\nNMI Resume ??\n");
87	}
88#else /* IBM-PC */
89	int isa_port = inb(0x61);
90	int eisa_port = inb(0x461);
91
92	log(LOG_CRIT, "NMI ISA %x, EISA %x\n", isa_port, eisa_port);
93#ifdef DEV_MCA
94	if (MCA_system && mca_bus_nmi())
95		return(0);
96#endif
97
98	if (isa_port & NMI_PARITY) {
99		log(LOG_CRIT, "RAM parity error, likely hardware failure.");
100		retval = 1;
101	}
102
103	if (isa_port & NMI_IOCHAN) {
104		log(LOG_CRIT, "I/O channel check, likely hardware failure.");
105		retval = 1;
106	}
107
108	/*
109	 * On a real EISA machine, this will never happen.  However it can
110	 * happen on ISA machines which implement XT style floating point
111	 * error handling (very rare).  Save them from a meaningless panic.
112	 */
113	if (eisa_port == 0xff)
114		return(retval);
115
116	if (eisa_port & ENMI_WATCHDOG) {
117		log(LOG_CRIT, "EISA watchdog timer expired, likely hardware failure.");
118		retval = 1;
119	}
120
121	if (eisa_port & ENMI_BUSTIMER) {
122		log(LOG_CRIT, "EISA bus timeout, likely hardware failure.");
123		retval = 1;
124	}
125
126	if (eisa_port & ENMI_IOSTATUS) {
127		log(LOG_CRIT, "EISA I/O port status error.");
128		retval = 1;
129	}
130#endif
131	return(retval);
132}
133