1 /* $NetBSD: devopen.c,v 1.2 1997/03/22 09:06:18 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1996 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed for the NetBSD Project 18 * by Matthias Drochner. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 35 #include <lib/libsa/stand.h> 36 #include <lib/libsa/ufs.h> 37 38 #include <libi386.h> 39 #include <biosdisk.h> 40 #include <dosfile.h> 41 42 struct devsw devsw[] = { 43 {"disk", biosdiskstrategy, biosdiskopen, biosdiskclose, biosdiskioctl}, 44 }; 45 int ndevs = sizeof(devsw) / sizeof(struct devsw); 46 47 static struct fs_ops dosfs = { 48 dos_open, dos_close, dos_read, dos_write, dos_seek, dos_stat 49 }; 50 static struct fs_ops ufsfs = { 51 ufs_open, ufs_close, ufs_read, ufs_write, ufs_seek, ufs_stat 52 }; 53 54 struct fs_ops file_system[] = { 55 {0}, 56 }; 57 int nfsys = 1; 58 59 static struct { 60 char *name; 61 int biosdev; 62 } biosdevtab[] = { 63 { 64 "fd", 0 65 }, 66 { 67 "wd", 0x80 68 }, 69 { 70 "sd", 0x80 71 }, 72 { 73 "hd", 0x80 74 } 75 }; 76 #define NUMBIOSDEVS (sizeof(biosdevtab) / sizeof(biosdevtab[0])) 77 78 static int 79 dev2bios(devname, unit, biosdev) 80 char *devname; 81 unsigned int unit; 82 int *biosdev; 83 { 84 int i; 85 86 for (i = 0; i < NUMBIOSDEVS; i++) 87 if (!strcmp(devname, biosdevtab[i].name)) { 88 *biosdev = biosdevtab[i].biosdev + unit; 89 if (unit >= 4) /* ??? */ 90 return (EUNIT); 91 return (0); 92 } 93 return (ENXIO); 94 } 95 96 int 97 devopen(f, fname, file) 98 struct open_file *f; 99 const char *fname; 100 char **file; 101 { 102 char *devname; 103 char *fsmode; 104 unsigned int unit, partition; 105 int biosdev; 106 int error; 107 struct devsw *dp; 108 109 if ((error = parsebootfile(fname, &fsmode, &devname, &unit, 110 &partition, (const char **) file))) 111 return (error); 112 113 if (!strcmp(fsmode, "dos")) { 114 file_system[0] = dosfs; /* structure assignment! */ 115 f->f_flags |= F_NODEV; /* handled by DOS */ 116 return (0); 117 } else if (!strcmp(fsmode, "ufs")) { 118 if ((error = dev2bios(devname, unit, &biosdev))) 119 return (error); 120 file_system[0] = ufsfs; /* structure assignment! */ 121 dp = &devsw[0]; /* must be biosdisk */ 122 f->f_dev = dp; 123 return (biosdiskopen(f, biosdev, partition)); 124 } else { 125 printf("no file system\n"); 126 return (ENXIO); 127 } 128 /* NOTREACHED */ 129 } 130