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
dev2bios(char * devname,unsigned int unit,int * biosdev)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
devopen(struct open_file * f,const char * fname,char ** file)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