1 /* $NetBSD: devopen.c,v 1.12 2024/06/29 13:46:40 rin 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 <bootinfo.h> 36 37 #include "dosfile.h" 38 39 struct devsw devsw[] = { 40 {"disk", biosdisk_strategy, biosdisk_open, biosdisk_close, biosdisk_ioctl}, 41 }; 42 int ndevs = sizeof(devsw) / sizeof(struct devsw); 43 44 static struct fs_ops dosfs = { 45 dos_open, dos_close, dos_read, dos_write, dos_seek, dos_stat 46 }; 47 static struct fs_ops ufsfs = { 48 ufs_open, ufs_close, ufs_read, ufs_write, ufs_seek, ufs_stat 49 }; 50 51 struct fs_ops file_system[] = { 52 {0}, 53 }; 54 int nfsys = 1; 55 56 static struct { 57 char *name; 58 int biosdev; 59 } biosdevtab[] = { 60 { 61 "fd", 0 62 }, 63 { 64 "wd", 0x80 65 }, 66 { 67 "sd", 0x80 68 }, 69 { 70 "hd", 0x80 71 } 72 }; 73 #define NUMBIOSDEVS (sizeof(biosdevtab) / sizeof(biosdevtab[0])) 74 75 static int dev2bios(char *, unsigned int, int *); 76 77 static int 78 dev2bios(char *devname, unsigned int unit, int *biosdev) 79 { 80 unsigned i; 81 82 for (i = 0; i < NUMBIOSDEVS; i++) 83 if (!strcmp(devname, biosdevtab[i].name)) { 84 *biosdev = biosdevtab[i].biosdev + unit; 85 if (unit >= 4) /* ??? */ 86 return (EUNIT); 87 return (0); 88 } 89 return (ENXIO); 90 } 91 92 struct btinfo_bootpath bibp; 93 94 int 95 devopen(struct open_file *f, const char *fname, char **file) 96 { 97 char *devname; 98 char *fsmode; 99 int unit, partition; 100 int biosdev; 101 int error; 102 struct devsw *dp; 103 104 if ((error = parsebootfile(fname, &fsmode, &devname, &unit, 105 &partition, (const char **) file))) 106 return (error); 107 108 if (!strcmp(fsmode, "dos")) { 109 file_system[0] = dosfs; /* structure assignment! */ 110 f->f_flags |= F_NODEV; /* handled by DOS */ 111 return (0); 112 } else if (!strcmp(fsmode, "ufs")) { 113 if ((error = dev2bios(devname, unit, &biosdev))) 114 return (error); 115 file_system[0] = ufsfs; /* structure assignment! */ 116 dp = &devsw[0]; /* must be biosdisk */ 117 f->f_dev = dp; 118 119 strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath)); 120 BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp)); 121 122 return (biosdisk_open(f, biosdev, partition)); 123 } else { 124 printf("no file system\n"); 125 return (ENXIO); 126 } 127 /* NOTREACHED */ 128 } 129