1 /* $NetBSD: biosdisk_user.c,v 1.6 2005/12/11 12:17:49 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1998 5 * Matthias Drochner. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 */ 28 29 #include "sanamespace.h" 30 31 #include <stdio.h> 32 #include <unistd.h> 33 #include <fcntl.h> 34 #include <err.h> 35 36 #include "biosdisk_ll.h" 37 #include "biosdisk_user.h" 38 39 /* 40 * Replacement for i386/stand/lib/bios_disk.S. 41 * Allows to map BIOS-like device numbers to character 42 * device nodes or plain files. 43 * The actual mapping is defined in the external table 44 * "emuldisktab". 45 */ 46 47 static int currentdev, currentdte; 48 static int fd = -1; 49 50 int 51 get_diskinfo(dev) 52 int dev; 53 { 54 int i, retval; 55 56 if (fd != -1) { 57 close(fd); 58 fd = -1; 59 } 60 61 i = 0; 62 for (;;) { 63 if (emuldisktab[i].biosdev == -1) 64 break; 65 if (emuldisktab[i].biosdev == dev) 66 goto ok; 67 i++; 68 } 69 warnx("unknown device %x", dev); 70 return (0); /* triggers error in set_geometry() */ 71 72 ok: 73 fd = open(emuldisktab[i].name, O_RDONLY, 0); 74 if (fd < 0) { 75 warn("open %s", emuldisktab[i].name); 76 return (0); 77 } 78 79 currentdev = dev; 80 currentdte = i; 81 82 retval = ((emuldisktab[i].cyls - 1) & 0xff) << 16; 83 retval |= ((emuldisktab[i].cyls - 1) & 0x300) << 6; 84 retval |= emuldisktab[i].spt << 8; 85 retval |= emuldisktab[i].heads - 1; 86 return (retval); 87 } 88 89 int 90 biosread(dev, cyl, head, sec, nsec, buf) 91 int dev; 92 int cyl, head, sec; 93 int nsec; 94 char *buf; 95 { 96 if (dev != currentdev) { 97 warnx("biosread: unexpected device %x", dev); 98 return (-1); 99 } 100 101 if (lseek(fd, ((cyl * emuldisktab[currentdte].heads + head) 102 * emuldisktab[currentdte].spt + sec) * 512, 103 SEEK_SET) == -1) { 104 warn("lseek"); 105 return (-1); 106 } 107 if (read(fd, buf, nsec * 512) != nsec * 512) { 108 warn("read"); 109 return (-1); 110 } 111 return (0); 112 } 113 114 int 115 int13_extension(dev) 116 int dev; 117 { 118 return (0); 119 } 120 121 void 122 int13_getextinfo(dev, info) 123 int dev; 124 struct biosdisk_ext13info *info; 125 { 126 } 127 128 struct ext { 129 int8_t size; 130 int8_t resvd; 131 int16_t cnt; 132 int16_t off; 133 int16_t seg; 134 int64_t sec; 135 }; 136 137 int 138 biosextread(dev, ext) 139 int dev; 140 struct ext *ext; 141 { 142 return (-1); 143 } 144