1 /* $NetBSD: devopen.c,v 1.1 2006/09/01 21:26:18 uwe Exp $ */
2
3 /*-
4 * Copyright (c) 1993 John Brezak
5 * 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. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
27 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <lib/libsa/stand.h>
32 #include <lib/libkern/libkern.h>
33
34 #include "biosdisk.h"
35
36 #include "boot.h"
37 #include "bootinfo.h"
38
39 static int dev2bios(char *devname, unsigned int unit, int *biosdev);
40 static int devlookup(char *d);
41
42 static int
dev2bios(char * devname,unsigned int unit,int * biosdev)43 dev2bios(char *devname, unsigned int unit, int *biosdev)
44 {
45
46 if (strcmp(devname, "hd") == 0) {
47 if (unit == 0 || unit == 1) {
48 *biosdev = 0x40 + (unit << 4);
49 return (0);
50 }
51 }
52 return (ENXIO);
53 }
54
55 int
bios2dev(int biosdev,char ** devname,u_int * unit,u_int sector,u_int * ptnp)56 bios2dev(int biosdev, char **devname, u_int *unit, u_int sector, u_int *ptnp)
57 {
58
59 *devname = "hd";
60 *unit = (biosdev >> 4) & 1;
61 *ptnp = biosdisk_findptn(biosdev, sector);
62 return (0);
63 }
64
65 static int
devlookup(char * d)66 devlookup(char *d)
67 {
68 struct devsw *dp = devsw;
69 int i;
70
71 for (i = 0; i < ndevs; i++, dp++) {
72 if ((dp->dv_name != NULL) && (strcmp(dp->dv_name, d) == 0)) {
73 return (i);
74 }
75 }
76
77 printf("No such device - Configured devices are:\n");
78 for (dp = devsw, i = 0; i < ndevs; i++, dp++) {
79 if (dp->dv_name != NULL) {
80 printf(" %s", dp->dv_name);
81 }
82 }
83 printf("\n");
84 return (-1);
85 }
86
87 int
devopen(struct open_file * f,const char * fname,char ** file)88 devopen(struct open_file *f, const char *fname, char **file)
89 {
90 static struct btinfo_bootpath bibp;
91 struct devsw *dp;
92 char *devname;
93 unsigned int dev, ctlr, unit, partition;
94 int biosdev;
95 int error;
96
97 #if defined(DEBUG)
98 printf("devopen: fname = %s\n", fname);
99 #endif
100
101 ctlr = 0;
102 if ((error = parsebootfile(fname, &devname, &unit, &partition,
103 (const char **)file)) != 0) {
104 return (error);
105 }
106
107 #if defined(DEBUG)
108 printf("devopen: devname = %s\n", devname);
109 #endif
110 dev = devlookup(devname);
111 if (dev == -1) {
112 #if defined(DEBUG)
113 printf("devopen: devlookup failed\n");
114 #endif
115 return (ENXIO);
116 }
117
118 dp = &devsw[dev];
119 if (dp->dv_open == NULL) {
120 #if defined(DEBUG)
121 printf("devopen: dev->dv_open() == NULL\n");
122 #endif
123 return (ENODEV);
124 }
125 f->f_dev = dp;
126
127 strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
128 BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
129
130 if (dev2bios(devname, unit, &biosdev) == 0) {
131 #if defined(DEBUG)
132 printf("devopen: bios disk\n");
133 #endif
134 return (biosdisk_open(f, biosdev, partition));
135 }
136
137 #if defined(DEBUG)
138 printf("devopen: dev->dv_open()\n");
139 #endif
140 if ((error = (*dp->dv_open)(f, ctlr, unit, partition)) == 0) {
141 #if defined(DEBUG)
142 printf("devopen: dev->dv_open() opened\n");
143 #endif
144 return (0);
145 }
146
147 printf("%s%d%c:%s : %s\n", dp->dv_name, unit, partition + 'a', *file,
148 strerror(error));
149 return (error);
150 }
151