summaryrefslogtreecommitdiffstats
path: root/firmware/common/disk.c
blob: c4553099ec8a3e86109499a189f56bd75d25462d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2002 by Björn Stenberg
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include <stdio.h>
#include "storage.h"
#include "debug.h"
#include "fat.h"
#ifdef HAVE_HOTSWAP
#include "hotswap.h"
#include "dir.h" /* for release_dirs() */
#include "file.h" /* for release_files() */
#endif
#include "disk.h"
#include <string.h>

/* Partition table entry layout:
   -----------------------
   0: 0x80 - active
   1: starting head
   2: starting sector
   3: starting cylinder
   4: partition type
   5: end head
   6: end sector
   7: end cylinder
   8-11: starting sector (LBA)
   12-15: nr of sectors in partition
*/

#define BYTES2INT32(array,pos)                  \
    ((long)array[pos] | ((long)array[pos+1] << 8 ) |        \
     ((long)array[pos+2] << 16 ) | ((long)array[pos+3] << 24 ))

static const unsigned char fat_partition_types[] = {
    0x0b, 0x1b, /* FAT32 + hidden variant */
    0x0c, 0x1c, /* FAT32 (LBA) + hidden variant */
#ifdef HAVE_FAT16SUPPORT
    0x04, 0x14, /* FAT16 <= 32MB + hidden variant */
    0x06, 0x16, /* FAT16  > 32MB + hidden variant */
    0x0e, 0x1e, /* FAT16 (LBA) + hidden variant */
#endif
};

static struct partinfo part[NUM_DRIVES*4]; /* space for 4 partitions on 2 drives */
static int vol_drive[NUM_VOLUMES]; /* mounted to which drive (-1 if none) */

#ifdef MAX_LOG_SECTOR_SIZE
int disk_sector_multiplier = 1;
#endif

struct partinfo* disk_init(IF_MD_NONVOID(int drive))
{
    int i;
    unsigned char sector[SECTOR_SIZE];
#ifdef HAVE_MULTIDRIVE
    /* For each drive, start at a different position, in order not to destroy 
       the first entry of drive 0. 
       That one is needed to calculate config sector position. */
    struct partinfo* pinfo = &part[drive*4];
    if ((size_t)drive >= sizeof(part)/sizeof(*part)/4)
        return NULL; /* out of space in table */
#else
    struct partinfo* pinfo = part;
    const int drive = 0;
    (void)drive;
#endif

    storage_read_sectors(drive, 0,1, &sector);
    /* check that the boot sector is initialized */
    if ( (sector[510] != 0x55) ||
         (sector[511] != 0xaa)) {
        DEBUGF("Bad boot sector signature\n");
        return NULL;
    }

    /* parse partitions */
    for ( i=0; i<4; i++ ) {
        unsigned char* ptr = sector + 0x1be + 16*i;
        pinfo[i].type  = ptr[4];
        pinfo[i].start = BYTES2INT32(ptr, 8);
        pinfo[i].size  = BYTES2INT32(ptr, 12);

        DEBUGF("Part%d: Type %02x, start: %08lx size: %08lx\n",
               i,pinfo[i].type,pinfo[i].start,pinfo[i].size);

        /* extended? */
        if ( pinfo[i].type == 5 ) {
            /* not handled yet */
        }
    }
    return pinfo;
}

struct partinfo* disk_partinfo(int partition)
{
    return &part[partition];
}

int disk_mount_all(void)
{
    int mounted=0;
    int i;
    
#ifdef HAVE_HOTSWAP
    card_enable_monitoring(false);
#endif

    fat_init(); /* reset all mounted partitions */
    for (i=0; i<NUM_VOLUMES; i++)
        vol_drive[i] = -1; /* mark all as unassigned */

#ifndef HAVE_MULTIDRIVE
    mounted = disk_mount(0);
#else
    for(i=0;i<NUM_DRIVES;i++)
    {
#ifdef HAVE_HOTSWAP
        if (storage_present(i))
#endif
            mounted += disk_mount(i); 
    }
#endif

#ifdef HAVE_HOTSWAP
    card_enable_monitoring(true);
#endif

    return mounted;
}

static int get_free_volume(void)
{
    int i;
    for (i=0; i<NUM_VOLUMES; i++)
    {
        if (vol_drive[i] == -1) /* unassigned? */
            return i;
    }

    return -1; /* none found */
}

int disk_mount(int drive)
{
    int mounted = 0; /* reset partition-on-drive flag */
    int volume = get_free_volume();
    struct partinfo* pinfo = disk_init(IF_MD(drive));

    if (pinfo == NULL)
    {
        return 0;
    }
#if defined(TOSHIBA_GIGABEAT_S)
    int i = 1;  /* For the Gigabeat S, we mount the second partition */
#else
    int i = 0;
#endif
    for (; volume != -1 && i<4 && mounted<NUM_VOLUMES_PER_DRIVE; i++)
    {
        if (memchr(fat_partition_types, pinfo[i].type,
                   sizeof(fat_partition_types)) == NULL)
            continue;  /* not an accepted partition type */

#ifdef MAX_LOG_SECTOR_SIZE
        int j;
        
        for (j = 1; j <= (MAX_LOG_SECTOR_SIZE/SECTOR_SIZE); j <<= 1)
        {
            if (!fat_mount(IF_MV2(volume,) IF_MD2(drive,) pinfo[i].start * j))
            {
                pinfo[i].start *= j;
                pinfo[i].size *= j;
                mounted++;
                vol_drive[volume] = drive; /* remember the drive for this volume */
                volume = get_free_volume(); /* prepare next entry */
                if (drive == 0)
                    disk_sector_multiplier = j;
                break;
            }
        }
#else
        if (!fat_mount(IF_MV2(volume,) IF_MD2(drive,) pinfo[i].start))
        {
            mounted++;
            vol_drive[volume] = drive; /* remember the drive for this volume */
            volume = get_free_volume(); /* prepare next entry */
        }
#endif
    }

    if (mounted == 0 && volume != -1) /* none of the 4 entries worked? */
    {   /* try "superfloppy" mode */
        DEBUGF("No partition found, trying to mount sector 0.\n");
        if (!fat_mount(IF_MV2(volume,) IF_MD2(drive,) 0))
        {
            mounted = 1;
            vol_drive[volume] = drive; /* remember the drive for this volume */
        }
    }
    return mounted;
}

#ifdef HAVE_HOTSWAP
int disk_unmount(int drive)
{
    int unmounted = 0;
    int i;
    for (i=0; i<NUM_VOLUMES; i++)
    {
        if (vol_drive[i] == drive)
        {   /* force releasing resources */
            vol_drive[i] = -1; /* mark unused */
            unmounted++;
            release_files(i);
            release_dirs(i);
            fat_unmount(i, false);
        }
    }

    return unmounted;
}
#endif /* #ifdef HAVE_HOTSWAP */