1 /* $NetBSD: devopen.c,v 1.8 2010/12/24 20:40:42 jakllsch Exp $ */
2
3 /*-
4 * Copyright (c) 2005 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Bang Jun-Young.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * Copyright (c) 1996, 1997
34 * Matthias Drochner. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 *
45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
46 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
47 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
48 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
49 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
50 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
51 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
52 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
53 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
54 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
55 */
56
57
58 #include <sys/types.h>
59
60 #include <lib/libsa/stand.h>
61 #include <lib/libkern/libkern.h>
62
63 #include <libi386.h>
64 #include <biosdisk.h>
65 #include "devopen.h"
66 #ifdef _STANDALONE
67 #include <bootinfo.h>
68 #endif
69 #ifdef SUPPORT_PS2
70 #include <biosmca.h>
71 #endif
72
73 static int dev2bios(char *, int, int *);
74
75 static int
dev2bios(char * devname,int unit,int * biosdev)76 dev2bios(char *devname, int unit, int *biosdev)
77 {
78
79 if (strcmp(devname, "hd") == 0)
80 *biosdev = 0x80 + unit;
81 else if (strcmp(devname, "fd") == 0)
82 *biosdev = 0x00 + unit;
83 else if (strcmp(devname, "cd") == 0)
84 *biosdev = boot_biosdev;
85 else
86 return ENXIO;
87
88 return 0;
89 }
90
91 void
bios2dev(int biosdev,daddr_t sector,char ** devname,int * unit,int * partition)92 bios2dev(int biosdev, daddr_t sector, char **devname, int *unit, int *partition)
93 {
94
95 /* set default */
96 *unit = biosdev & 0x7f;
97
98 if (biosdev & 0x80) {
99 /*
100 * There seems to be no standard way of numbering BIOS
101 * CD-ROM drives. The following method is a little tricky
102 * but works nicely.
103 */
104 if (biosdev >= 0x80 + get_harddrives()) {
105 *devname = "cd";
106 *unit = 0; /* override default */
107 } else
108 *devname = "hd";
109 } else
110 *devname = "fd";
111
112 *partition = biosdisk_findpartition(biosdev, sector);
113 }
114
115 #ifdef _STANDALONE
116 struct btinfo_bootpath bibp;
117 extern bool kernel_loaded;
118 #endif
119
120 /*
121 * Open the BIOS disk device
122 */
123 int
devopen(struct open_file * f,const char * fname,char ** file)124 devopen(struct open_file *f, const char *fname, char **file)
125 {
126 char *fsname, *devname;
127 int unit, partition;
128 int biosdev;
129 int error;
130
131 if ((error = parsebootfile(fname, &fsname, &devname,
132 &unit, &partition, (const char **) file))
133 || (error = dev2bios(devname, unit, &biosdev)))
134 return error;
135
136 f->f_dev = &devsw[0]; /* must be biosdisk */
137
138 #ifdef _STANDALONE
139 if (!kernel_loaded) {
140 strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
141 BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
142 }
143 #endif
144
145 return biosdisk_open(f, biosdev, partition);
146 }
147