1 /* $NetBSD: devopen.c,v 1.11 2009/03/14 15:36:07 dsl 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 * 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 <lib/libsa/stand.h> 30 #include <lib/libkern/libkern.h> 31 #include <lib/libsa/ufs.h> 32 33 #include <libi386.h> 34 #include <biosdisk.h> 35 #include <dosfile.h> 36 #include <bootinfo.h> 37 38 struct devsw devsw[] = { 39 {"disk", biosdisk_strategy, biosdisk_open, biosdisk_close, biosdisk_ioctl}, 40 }; 41 int ndevs = sizeof(devsw) / sizeof(struct devsw); 42 43 static struct fs_ops dosfs = { 44 dos_open, dos_close, dos_read, dos_write, dos_seek, dos_stat 45 }; 46 static struct fs_ops ufsfs = { 47 ufs_open, ufs_close, ufs_read, ufs_write, ufs_seek, ufs_stat 48 }; 49 50 struct fs_ops file_system[] = { 51 {0}, 52 }; 53 int nfsys = 1; 54 55 static struct { 56 char *name; 57 int biosdev; 58 } biosdevtab[] = { 59 { 60 "fd", 0 61 }, 62 { 63 "wd", 0x80 64 }, 65 { 66 "sd", 0x80 67 }, 68 { 69 "hd", 0x80 70 } 71 }; 72 #define NUMBIOSDEVS (sizeof(biosdevtab) / sizeof(biosdevtab[0])) 73 74 static int dev2bios(char *, unsigned int, int *); 75 76 static int 77 dev2bios(char *devname, unsigned int unit, int *biosdev) 78 { 79 unsigned i; 80 81 for (i = 0; i < NUMBIOSDEVS; i++) 82 if (!strcmp(devname, biosdevtab[i].name)) { 83 *biosdev = biosdevtab[i].biosdev + unit; 84 if (unit >= 4) /* ??? */ 85 return (EUNIT); 86 return (0); 87 } 88 return (ENXIO); 89 } 90 91 struct btinfo_bootpath bibp; 92 93 int 94 devopen(struct open_file *f, const char *fname, char **file) 95 { 96 char *devname; 97 char *fsmode; 98 int unit, partition; 99 int biosdev; 100 int error; 101 struct devsw *dp; 102 103 if ((error = parsebootfile(fname, &fsmode, &devname, &unit, 104 &partition, (const char **) file))) 105 return (error); 106 107 if (!strcmp(fsmode, "dos")) { 108 file_system[0] = dosfs; /* structure assignment! */ 109 f->f_flags |= F_NODEV; /* handled by DOS */ 110 return (0); 111 } else if (!strcmp(fsmode, "ufs")) { 112 if ((error = dev2bios(devname, unit, &biosdev))) 113 return (error); 114 file_system[0] = ufsfs; /* structure assignment! */ 115 dp = &devsw[0]; /* must be biosdisk */ 116 f->f_dev = dp; 117 118 strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath)); 119 BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp)); 120 121 return (biosdisk_open(f, biosdev, partition)); 122 } else { 123 printf("no file system\n"); 124 return (ENXIO); 125 } 126 /* NOTREACHED */ 127 } 128