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 * 3. 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 #include <sys/types.h> 39 #include <sys/syslog.h> 40 #include <sys/systm.h> 41 42 #include <machine/md_var.h> 43 44 #define NMI_PARITY (1 << 7) 45 #define NMI_IOCHAN (1 << 6) 46 #define ENMI_WATCHDOG (1 << 7) 47 #define ENMI_BUSTIMER (1 << 6) 48 #define ENMI_IOSTATUS (1 << 5) 49 50 /* 51 * Handle a NMI, possibly a machine check. 52 * return true to panic system, false to ignore. 53 */ 54 int 55 isa_nmi(int cd) 56 { 57 int retval = 0; 58 int isa_port = inb(0x61); 59 int eisa_port = inb(0x461); 60 61 log(LOG_CRIT, "NMI ISA %x, EISA %x\n", isa_port, eisa_port); 62 63 if (isa_port & NMI_PARITY) { 64 log(LOG_CRIT, "RAM parity error, likely hardware failure."); 65 retval = 1; 66 } 67 68 if (isa_port & NMI_IOCHAN) { 69 log(LOG_CRIT, "I/O channel check, likely hardware failure."); 70 retval = 1; 71 } 72 73 /* 74 * On a real EISA machine, this will never happen. However it can 75 * happen on ISA machines which implement XT style floating point 76 * error handling (very rare). Save them from a meaningless panic. 77 */ 78 if (eisa_port == 0xff) 79 return(retval); 80 81 if (eisa_port & ENMI_WATCHDOG) { 82 log(LOG_CRIT, "EISA watchdog timer expired, likely hardware failure."); 83 retval = 1; 84 } 85 86 if (eisa_port & ENMI_BUSTIMER) { 87 log(LOG_CRIT, "EISA bus timeout, likely hardware failure."); 88 retval = 1; 89 } 90 91 if (eisa_port & ENMI_IOSTATUS) { 92 log(LOG_CRIT, "EISA I/O port status error."); 93 retval = 1; 94 } 95 96 return(retval); 97 } 98