summaryrefslogtreecommitdiffstats
path: root/firmware/common/disk.c
blob: 51d033b678f0933f3fa5ef717da75f72d2bc491f (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
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
/***************************************************************************
 *             __________               __   ___.
 *   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 <string.h>
#include "config.h"
#include "kernel.h"
#include "storage.h"
#include "debug.h"
#include "disk_cache.h"
#include "fileobj_mgr.h"
#include "dir.h"
#include "dircache_redirect.h"
#include "disk.h"

#if defined(HAVE_BOOTDATA) && !defined(SIMULATOR) && !defined(BOOTLOADER)
#include "bootdata.h"
#include "crc32.h"
#endif

#ifndef CONFIG_DEFAULT_PARTNUM
#define CONFIG_DEFAULT_PARTNUM 0
#endif

#define disk_reader_lock()      file_internal_lock_READER()
#define disk_reader_unlock()    file_internal_unlock_READER()
#define disk_writer_lock()      file_internal_lock_WRITER()
#define disk_writer_unlock()    file_internal_unlock_WRITER()

/* 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) \
    (((uint32_t)array[pos+0] <<  0) | \
     ((uint32_t)array[pos+1] <<  8) | \
     ((uint32_t)array[pos+2] << 16) | \
     ((uint32_t)array[pos+3] << 24))

#define BYTES2INT16(array, pos) \
    (((uint32_t)array[pos+0] << 0) | \
     ((uint32_t)array[pos+1] << 8))

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

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

    return -1; /* none found */
}

#ifdef MAX_LOG_SECTOR_SIZE
static int disk_sector_multiplier[NUM_DRIVES] =
    { [0 ... NUM_DRIVES-1] = 1 };

int disk_get_sector_multiplier(IF_MD_NONVOID(int drive))
{
    if (!CHECK_DRV(drive))
        return 0;

    disk_reader_lock();
    int multiplier = disk_sector_multiplier[IF_MD_DRV(drive)];
    disk_reader_unlock();
    return multiplier;
}
#endif /* MAX_LOG_SECTOR_SIZE */

bool disk_init(IF_MD_NONVOID(int drive))
{
    if (!CHECK_DRV(drive))
        return false; /* out of space in table */

    unsigned char *sector = dc_get_buffer();
    if (!sector)
        return false;

    memset(sector, 0, SECTOR_SIZE);
    storage_read_sectors(IF_MD(drive,) 0, 1, sector);

    bool init = false;

    /* check that the boot sector is initialized */
    if (BYTES2INT16(sector, 510) == 0xaa55)
    {
        /* 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[IF_MD_DRV(drive)*4];

        disk_writer_lock();

        /* parse partitions */
        for (int 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 */
            }
        }

        disk_writer_unlock();

        init = true;
    }
    else
    {
        DEBUGF("Bad boot sector signature\n");
    }

    dc_release_buffer(sector);
    return init;
}

bool disk_partinfo(int partition, struct partinfo *info)
{
    if (partition < 0 || partition >= (int)ARRAYLEN(part) || !info)
        return false;

    disk_reader_lock();
    *info = part[partition];
    disk_reader_unlock();
    return true;
}

int disk_mount(int drive)
{
    int mounted = 0; /* reset partition-on-drive flag */

    disk_writer_lock();

    int volume = get_free_volume();

    if (!disk_init(IF_MD(drive)))
    {
        disk_writer_unlock();
        return 0;
    }

    struct partinfo *pinfo = &part[IF_MD_DRV(drive)*4];
#ifdef MAX_LOG_SECTOR_SIZE
    disk_sector_multiplier[IF_MD_DRV(drive)] = 1;
#endif


       /* try "superfloppy" mode */
        DEBUGF("Trying to mount sector 0.\n");

        if (!fat_mount(IF_MV(volume,) IF_MD(drive,) 0))
        {
        #ifdef MAX_LOG_SECTOR_SIZE
            disk_sector_multiplier[drive] =
                fat_get_bytes_per_sector(IF_MV(volume)) / SECTOR_SIZE;
        #endif
            mounted = 1;
            vol_drive[volume] = drive; /* remember the drive for this volume */
            volume_onmount_internal(IF_MV(volume));
        }

    if (mounted == 0 && volume != -1) /* not a "superfloppy"? */
    {
        for (int i = CONFIG_DEFAULT_PARTNUM;
             volume != -1 && i < 4 && mounted < NUM_VOLUMES_PER_DRIVE;
             i++)
        {
            if (pinfo[i].type == 0 || pinfo[i].type == 5)
                continue;  /* skip free/extended partitions */

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

    disk_writer_unlock();
    return mounted;
}

int disk_mount_all(void)
{
    int mounted = 0;

    disk_writer_lock();

    /* reset all mounted partitions */
    volume_onunmount_internal(IF_MV(-1));
    fat_init();

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

#if defined(HAVE_BOOTDATA) && !defined(SIMULATOR) && !defined(BOOTLOADER)
    unsigned int crc = 0;
    int boot_volume = 0;
    crc = crc_32(boot_data.payload, boot_data.length, 0xffffffff);
    if(crc == boot_data.crc)
    {
        boot_volume = boot_data.boot_volume; /* boot volume contained in uint8_t payload */
    }
    #ifdef HAVE_HOTSWAP
        if (storage_present(boot_volume))
    #endif
            mounted += disk_mount(boot_volume); /* mount boot volume first */
    for (int i = 0; i < NUM_DRIVES; i++)
    if (i != boot_volume)
#else
    for (int i = 0; i < NUM_DRIVES; i++)
#endif
    {
    #ifdef HAVE_HOTSWAP
        if (storage_present(i))
    #endif
            mounted += disk_mount(i);
    }

    disk_writer_unlock();
    return mounted;
}

int disk_unmount(int drive)
{
    if (!CHECK_DRV(drive))
        return 0;

    int unmounted = 0;

    disk_writer_lock();

    for (int i = 0; i < NUM_VOLUMES; i++)
    {
        if (vol_drive[i] == drive)
        {   /* force releasing resources */
            vol_drive[i] = -1; /* mark unused */

            volume_onunmount_internal(IF_MV(i));
            fat_unmount(IF_MV(i));

            unmounted++;
        }
    }

    disk_writer_unlock();
    return unmounted;
}

int disk_unmount_all(void)
{
    int unmounted = 0;

    disk_writer_lock();

    volume_onunmount_internal(IF_MV(-1));

    for (int i = 0; i < NUM_DRIVES; i++)
    {
    #ifdef HAVE_HOTSWAP
        if (storage_present(i))
    #endif
            unmounted += disk_unmount(i);
    }

    disk_writer_unlock();
    return unmounted;
}

bool disk_present(IF_MD_NONVOID(int drive))
{
    int rc = -1;

    if (CHECK_DRV(drive))
    {
        void *sector = dc_get_buffer();
        if (sector)
        {
            rc = storage_read_sectors(IF_MD(drive,) 0, 1, sector);
            dc_release_buffer(sector);
        }
    }

    return rc == 0;
}


/** Volume-centric functions **/

void volume_recalc_free(IF_MV_NONVOID(int volume))
{
    if (!CHECK_VOL(volume))
        return;

    /* FIXME: this is crummy but the only way to ensure a correct freecount
       if other threads are writing and changing the fsinfo; it is possible
       to get multiple threads calling here and also writing and get correct
       freespace counts, however a bit complicated to do; if thou desireth I
       shall implement the concurrent version -- jethead71 */
    disk_writer_lock();
    fat_recalc_free(IF_MV(volume));
    disk_writer_unlock();
}

unsigned int volume_get_cluster_size(IF_MV_NONVOID(int volume))
{
    if (!CHECK_VOL(volume))
        return 0;

    disk_reader_lock();
    unsigned int clustersize = fat_get_cluster_size(IF_MV(volume));
    disk_reader_unlock();
    return clustersize;
}

void volume_size(IF_MV(int volume,) unsigned long *sizep, unsigned long *freep)
{
    disk_reader_lock();

    if (!CHECK_VOL(volume) || !fat_size(IF_MV(volume,) sizep, freep))
    {
        if (freep) *sizep = 0;
        if (freep) *freep = 0;
    }

    disk_reader_unlock();
}

#if defined (HAVE_HOTSWAP) || defined (HAVE_MULTIDRIVE) \
    || defined (HAVE_DIRCACHE)
enum volume_info_type
{
#ifdef HAVE_HOTSWAP
    VP_REMOVABLE,
    VP_PRESENT,
#endif
#if defined (HAVE_MULTIDRIVE) || defined (HAVE_DIRCACHE)
    VP_DRIVE,
#endif
};

static int volume_properties(int volume, enum volume_info_type infotype)
{
    int res = -1;

    disk_reader_lock();

    if (CHECK_VOL(volume))
    {
        int vd = vol_drive[volume];
        switch (infotype)
        {
    #ifdef HAVE_HOTSWAP
        case VP_REMOVABLE:
            res = storage_removable(vd) ? 1 : 0;
            break;
        case VP_PRESENT:
            res = storage_present(vd) ? 1 : 0;
            break;
    #endif
    #if defined(HAVE_MULTIDRIVE) || defined(HAVE_DIRCACHE)
        case VP_DRIVE:
            res = vd;
            break;
    #endif
        }
    }

    disk_reader_unlock();
    return res;
}

#ifdef HAVE_HOTSWAP
bool volume_removable(int volume)
{
    return volume_properties(volume, VP_REMOVABLE) > 0;
}

bool volume_present(int volume)
{
    return volume_properties(volume, VP_PRESENT) > 0;
}
#endif /* HAVE_HOTSWAP */

#ifdef HAVE_MULTIDRIVE
int volume_drive(int volume)
{
    return volume_properties(volume, VP_DRIVE);
}
#endif /* HAVE_MULTIDRIVE */

#ifdef HAVE_DIRCACHE
bool volume_ismounted(IF_MV_NONVOID(int volume))
{
    return volume_properties(IF_MV_VOL(volume), VP_DRIVE) >= 0;
}
#endif /* HAVE_DIRCACHE */

#endif /* HAVE_HOTSWAP || HAVE_MULTIDRIVE || HAVE_DIRCACHE */