1 /*
2 * (C) Copyright 2002
3 * St�ubli Faverges - <www.staubli.com>
4 * Pierre AUBERT p.aubert@staubli.com
5 *
6 * See file CREDITS for list of people who contributed to this
7 * project.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 * MA 02111-1307 USA
23 */
24
25 #include <common.h>
26 #include <config.h>
27 #include <malloc.h>
28
29 #include "dos.h"
30 #include "fdos.h"
31
32
33 /*-----------------------------------------------------------------------------
34 * fill_fs -- Read info on file system
35 *-----------------------------------------------------------------------------
36 */
fill_fs(BootSector_t * boot,Fs_t * fs)37 static int fill_fs (BootSector_t *boot, Fs_t *fs)
38 {
39
40 fs -> fat_start = __le16_to_cpu (boot -> nrsvsect);
41 fs -> fat_len = __le16_to_cpu (boot -> fatlen);
42 fs -> nb_fat = boot -> nfat;
43
44 fs -> dir_start = fs -> fat_start + fs -> nb_fat * fs -> fat_len;
45 fs -> dir_len = __le16_to_cpu (boot -> dirents) * MDIR_SIZE / SZ_STD_SECTOR;
46 fs -> cluster_size = boot -> clsiz;
47 fs -> num_clus = (fs -> tot_sectors - fs -> dir_start - fs -> dir_len) / fs -> cluster_size;
48
49 return (0);
50 }
51
52 /*-----------------------------------------------------------------------------
53 * fs_init --
54 *-----------------------------------------------------------------------------
55 */
fs_init(Fs_t * fs)56 int fs_init (Fs_t *fs)
57 {
58 BootSector_t *boot;
59
60 /* Initialize physical device */
61 if (dev_open () < 0) {
62 PRINTF ("Unable to initialize the fdc\n");
63 return (-1);
64 }
65 init_subdir ();
66
67 /* Allocate space for read the boot sector */
68 if ((boot = (BootSector_t *)malloc (sizeof (BootSector_t))) == NULL) {
69 PRINTF ("Unable to allocate space for boot sector\n");
70 return (-1);
71 }
72
73 /* read boot sector */
74 if (dev_read (boot, 0, 1)){
75 PRINTF ("Error during boot sector read\n");
76 free (boot);
77 return (-1);
78 }
79
80 /* we verify it'a a DOS diskette */
81 if (boot -> jump [0] != JUMP_0_1 && boot -> jump [0] != JUMP_0_2) {
82 PRINTF ("Not a DOS diskette\n");
83 free (boot);
84 return (-1);
85 }
86
87 if (boot -> descr < MEDIA_STD) {
88 /* We handle only recent medias (type F0) */
89 PRINTF ("unrecognized diskette type\n");
90 free (boot);
91 return (-1);
92 }
93
94 if (check_dev (boot, fs) < 0) {
95 PRINTF ("Bad diskette\n");
96 free (boot);
97 return (-1);
98 }
99
100 if (fill_fs (boot, fs) < 0) {
101 free (boot);
102
103 return (-1);
104 }
105
106 /* Read FAT */
107 if (read_fat (boot, fs) < 0) {
108 free (boot);
109 return (-1);
110 }
111
112 free (boot);
113 return (0);
114 }
115