blob: 68bbde0e27cbf939ee9f285eb4b7cee787b74fe1 [file] [log] [blame]
wdenk2262cfe2002-11-18 00:14:45 +00001/*
2 * (C) Copyright 2002
3 * Stäubli 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#if (CONFIG_COMMANDS & CFG_CMD_FDOS)
30
31#include "dos.h"
32#include "fdos.h"
33
34
35/*-----------------------------------------------------------------------------
36 * fill_fs -- Read info on file system
37 *-----------------------------------------------------------------------------
38 */
39static int fill_fs (BootSector_t *boot, Fs_t *fs)
40{
41
42 fs -> fat_start = __le16_to_cpu (boot -> nrsvsect);
43 fs -> fat_len = __le16_to_cpu (boot -> fatlen);
44 fs -> nb_fat = boot -> nfat;
45
46 fs -> dir_start = fs -> fat_start + fs -> nb_fat * fs -> fat_len;
47 fs -> dir_len = __le16_to_cpu (boot -> dirents) * MDIR_SIZE / SZ_STD_SECTOR;
48 fs -> cluster_size = boot -> clsiz;
49 fs -> num_clus = (fs -> tot_sectors - fs -> dir_start - fs -> dir_len) / fs -> cluster_size;
50
51 return (0);
52}
53
54/*-----------------------------------------------------------------------------
55 * fs_init --
56 *-----------------------------------------------------------------------------
57 */
58int fs_init (Fs_t *fs)
59{
60 BootSector_t *boot;
61
62 /* Initialize physical device */
63 if (dev_open () < 0) {
64 PRINTF ("Unable to initialize the fdc\n");
65 return (-1);
66 }
67 init_subdir ();
68
69 /* Allocate space for read the boot sector */
70 if ((boot = (BootSector_t *)malloc (sizeof (BootSector_t))) == NULL) {
71 PRINTF ("Unable to allocate space for boot sector\n");
72 return (-1);
73 }
74
75 /* read boot sector */
76 if (dev_read (boot, 0, 1)){
77 PRINTF ("Error during boot sector read\n");
78 free (boot);
79 return (-1);
80 }
81
82 /* we verify it'a a DOS diskette */
83 if (boot -> jump [0] != JUMP_0_1 && boot -> jump [0] != JUMP_0_2) {
84 PRINTF ("Not a DOS diskette\n");
85 free (boot);
86 return (-1);
87 }
88
89 if (boot -> descr < MEDIA_STD) {
90 /* We handle only recent medias (type F0) */
91 PRINTF ("unrecognized diskette type\n");
92 free (boot);
93 return (-1);
94 }
95
96 if (check_dev (boot, fs) < 0) {
97 PRINTF ("Bad diskette\n");
98 free (boot);
99 return (-1);
100 }
101
102 if (fill_fs (boot, fs) < 0) {
103 free (boot);
104
105 return (-1);
106 }
107
108 /* Read FAT */
109 if (read_fat (boot, fs) < 0) {
110 free (boot);
111 return (-1);
112 }
113
114 free (boot);
115 return (0);
116}
117
118
119
120#endif