1 /* $NetBSD: devopen.c,v 1.4 1999/04/14 11:53:44 drochner 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/libkern/libkern.h> 37 #include <lib/libsa/ufs.h> 38 39 #include <libi386.h> 40 #include <biosdisk.h> 41 #include <dosfile.h> 42 #include <bootinfo.h> 43 44 extern int parsebootfile __P((const char *, char**, char**, unsigned int*, 45 unsigned int*, const char**)); 46 47 struct devsw devsw[] = { 48 {"disk", biosdiskstrategy, biosdiskopen, biosdiskclose, biosdiskioctl}, 49 }; 50 int ndevs = sizeof(devsw) / sizeof(struct devsw); 51 52 static struct fs_ops dosfs = { 53 dos_open, dos_close, dos_read, dos_write, dos_seek, dos_stat 54 }; 55 static struct fs_ops ufsfs = { 56 ufs_open, ufs_close, ufs_read, ufs_write, ufs_seek, ufs_stat 57 }; 58 59 struct fs_ops file_system[] = { 60 {0}, 61 }; 62 int nfsys = 1; 63 64 static struct { 65 char *name; 66 int biosdev; 67 } biosdevtab[] = { 68 { 69 "fd", 0 70 }, 71 { 72 "wd", 0x80 73 }, 74 { 75 "sd", 0x80 76 }, 77 { 78 "hd", 0x80 79 } 80 }; 81 #define NUMBIOSDEVS (sizeof(biosdevtab) / sizeof(biosdevtab[0])) 82 83 static int dev2bios __P((char *, unsigned int, int *)); 84 85 static int 86 dev2bios(devname, unit, biosdev) 87 char *devname; 88 unsigned int unit; 89 int *biosdev; 90 { 91 int i; 92 93 for (i = 0; i < NUMBIOSDEVS; i++) 94 if (!strcmp(devname, biosdevtab[i].name)) { 95 *biosdev = biosdevtab[i].biosdev + unit; 96 if (unit >= 4) /* ??? */ 97 return (EUNIT); 98 return (0); 99 } 100 return (ENXIO); 101 } 102 103 struct btinfo_bootpath bibp; 104 105 int 106 devopen(f, fname, file) 107 struct open_file *f; 108 const char *fname; 109 char **file; 110 { 111 char *devname; 112 char *fsmode; 113 unsigned int unit, partition; 114 int biosdev; 115 int error; 116 struct devsw *dp; 117 118 if ((error = parsebootfile(fname, &fsmode, &devname, &unit, 119 &partition, (const char **) file))) 120 return (error); 121 122 if (!strcmp(fsmode, "dos")) { 123 file_system[0] = dosfs; /* structure assignment! */ 124 f->f_flags |= F_NODEV; /* handled by DOS */ 125 return (0); 126 } else if (!strcmp(fsmode, "ufs")) { 127 if ((error = dev2bios(devname, unit, &biosdev))) 128 return (error); 129 file_system[0] = ufsfs; /* structure assignment! */ 130 dp = &devsw[0]; /* must be biosdisk */ 131 f->f_dev = dp; 132 133 strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath)); 134 BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp)); 135 136 return (biosdiskopen(f, biosdev, partition)); 137 } else { 138 printf("no file system\n"); 139 return (ENXIO); 140 } 141 /* NOTREACHED */ 142 } 143