1 /* $NetBSD: biosdisk_user.c,v 1.7 2008/12/14 18:46:33 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(int dev) 52 { 53 int i, retval; 54 55 if (fd != -1) { 56 close(fd); 57 fd = -1; 58 } 59 60 i = 0; 61 for (;;) { 62 if (emuldisktab[i].biosdev == -1) 63 break; 64 if (emuldisktab[i].biosdev == dev) 65 goto ok; 66 i++; 67 } 68 warnx("unknown device %x", dev); 69 return 0; /* triggers error in set_geometry() */ 70 71 ok: 72 fd = open(emuldisktab[i].name, O_RDONLY, 0); 73 if (fd < 0) { 74 warn("open %s", emuldisktab[i].name); 75 return 0; 76 } 77 78 currentdev = dev; 79 currentdte = i; 80 81 retval = ((emuldisktab[i].cyls - 1) & 0xff) << 16; 82 retval |= ((emuldisktab[i].cyls - 1) & 0x300) << 6; 83 retval |= emuldisktab[i].spt << 8; 84 retval |= emuldisktab[i].heads - 1; 85 return retval; 86 } 87 88 int 89 biosread(int dev, int cyl, int head, int sec, int nsec, char *buf) 90 { 91 92 if (dev != currentdev) { 93 warnx("biosread: unexpected device %x", dev); 94 return -1; 95 } 96 97 if (lseek(fd, ((cyl * emuldisktab[currentdte].heads + head) 98 * emuldisktab[currentdte].spt + sec) * 512, 99 SEEK_SET) == -1) { 100 warn("lseek"); 101 return -1; 102 } 103 if (read(fd, buf, nsec * 512) != nsec * 512) { 104 warn("read"); 105 return -1; 106 } 107 return 0; 108 } 109 110 int 111 int13_extension(int dev) 112 { 113 114 return 0; 115 } 116 117 void 118 int13_getextinfo(int dev, struct biosdisk_ext13info *info) 119 { 120 } 121 122 struct ext { 123 int8_t size; 124 int8_t resvd; 125 int16_t cnt; 126 int16_t off; 127 int16_t seg; 128 int64_t sec; 129 }; 130 131 int 132 biosextread(int dev, struct ext *ext) 133 { 134 return -1; 135 } 136