summaryrefslogtreecommitdiff
path: root/disk/part_amiga.c
blob: 0e6d82dbaed70def98249ac7535098b5fa93a91f (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
/*
 * (C) Copyright 2001
 * Hans-Joerg Frieden, Hyperion Entertainment
 * Hans-JoergF@hyperion-entertainment.com
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */
#include <common.h>
#include <command.h>
#include <ide.h>
#include "part_amiga.h"

#ifdef HAVE_BLOCK_DEVICE

#undef AMIGA_DEBUG

#ifdef AMIGA_DEBUG
#define PRINTF(fmt, args...) printf(fmt ,##args)
#else
#define PRINTF(fmt, args...)
#endif

struct block_header
{
    u32 id;
    u32 summed_longs;
    s32 chk_sum;
};

static unsigned char block_buffer[DEFAULT_SECTOR_SIZE];
static struct rigid_disk_block rdb = {0};
static struct bootcode_block bootcode = {0};

/*
 * Copy a bcpl to a c string
 */
static void bcpl_strcpy(char *to, char *from)
{
    int len = *from++;

    while (len)
    {
	*to++ = *from++;
	len--;
    }
    *to = 0;
}

/*
 * Print a BCPL String. BCPL strings start with a byte with the length
 * of the string, and don't contain a terminating nul character
 */
static void bstr_print(char *string)
{
    int len = *string++;
    char buffer[256];
    int i;

    i = 0;
    while (len)
    {
	buffer[i++] = *string++;
	len--;
    }

    buffer[i] = 0;
    printf("%-10s", buffer);
}

/*
 * Sum a block. The checksum of a block must end up at zero
 * to be valid. The chk_sum field is selected so that adding
 * it yields zero.
 */
int sum_block(struct block_header *header)
{
    s32 *block = (s32 *)header;
    u32 i;
    s32 sum = 0;

    for (i = 0; i < header->summed_longs; i++)
	sum += *block++;

    return (sum != 0);
}

/*
 * Print an AmigaOS disk type. Disk types are a four-byte identifier
 * describing the file system. They are usually written as a three-letter
 * word followed by a backslash and a version number. For example,
 * DOS\0 would be the original file system. SFS\0 would be SmartFileSystem.
 * DOS\1 is FFS.
 */
static void print_disk_type(u32 disk_type)
{
    char buffer[6];
    buffer[0] = (disk_type & 0xFF000000)>>24;
    buffer[1] = (disk_type & 0x00FF0000)>>16;
    buffer[2] = (disk_type & 0x0000FF00)>>8;
    buffer[3] = '\\';
    buffer[4] = (disk_type & 0x000000FF) + '0';
    buffer[5] = 0;
    printf("%s", buffer);
}

/*
 * Print the info contained within the given partition block
 */
static void print_part_info(struct partition_block *p)
{
    struct amiga_part_geometry *g;

    g = (struct amiga_part_geometry *)&(p->environment);

    bstr_print(p->drive_name);
    printf("%6d\t%6d\t",
	   g->low_cyl * g->block_per_track * g->surfaces ,
	   (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1);
    print_disk_type(g->dos_type);
    printf("\t%5d\n", g->boot_priority);
}

/*
 * Search for the Rigid Disk Block. The rigid disk block is required
 * to be within the first 16 blocks of a drive, needs to have
 * the ID AMIGA_ID_RDISK ('RDSK') and needs to have a valid
 * sum-to-zero checksum
 */
struct rigid_disk_block *get_rdisk(block_dev_desc_t *dev_desc)
{
    int i;
    int limit;
    char *s;

    s = getenv("amiga_scanlimit");
    if (s)
	limit = simple_strtoul(s, NULL, 10);
    else
	limit = AMIGA_BLOCK_LIMIT;

    for (i=0; i<limit; i++)
    {
	ulong res = dev_desc->block_read(dev_desc->dev, i, 1,
					 (ulong *)block_buffer);
	if (res == 1)
	{
	    struct rigid_disk_block *trdb = (struct rigid_disk_block *)block_buffer;
	    if (trdb->id == AMIGA_ID_RDISK)
	    {
		PRINTF("Rigid disk block suspect at %d, checking checksum\n",i);
		if (sum_block((struct block_header *)block_buffer) == 0)
		{
		    PRINTF("FOUND\n");
		    memcpy(&rdb, trdb, sizeof(struct rigid_disk_block));
		    return (struct rigid_disk_block *)&rdb;
		}
	    }
	}
    }
    PRINTF("Done scanning, no RDB found\n");
    return NULL;
}

/*
 * Search for boot code
 * Again, the first boot block must be located somewhere in the first 16 blocks, or rooted in the
 * Ridgid disk block
 */

struct bootcode_block *get_bootcode(block_dev_desc_t *dev_desc)
{
    int i;
    int limit;
    char *s;

    s = getenv("amiga_scanlimit");
    if (s)
	limit = simple_strtoul(s, NULL, 10);
    else
	limit = AMIGA_BLOCK_LIMIT;

    PRINTF("Scanning for BOOT from 0 to %d\n", limit);

    for (i = 0; i < limit; i++)
    {
	ulong res = dev_desc->block_read(dev_desc->dev, i, 1, (ulong *)block_buffer);
	if (res == 1)
	{
	    struct bootcode_block *boot = (struct bootcode_block *)block_buffer;
	    if (boot->id == AMIGA_ID_BOOT)
	    {
		PRINTF("BOOT block at %d, checking checksum\n", i);
		if (sum_block((struct block_header *)block_buffer) == 0)
		{
		    PRINTF("Found valid bootcode block\n");
		    memcpy(&bootcode, boot, sizeof(struct bootcode_block));
		    return &bootcode;
		}
	    }
	}
    }

    PRINTF("No boot code found on disk\n");
    return 0;
}

/*
 * Test if the given partition has an Amiga partition table/Rigid
 * Disk block
 */
int test_part_amiga(block_dev_desc_t *dev_desc)
{
    struct rigid_disk_block *rdb;
    struct bootcode_block *bootcode;

    PRINTF("test_part_amiga: Testing for an Amiga RDB partition\n");

    rdb = get_rdisk(dev_desc);
    if (rdb)
    {
	bootcode = get_bootcode(dev_desc);
	if (bootcode)
	    PRINTF("test_part_amiga: bootable Amiga disk\n");
	else
	    PRINTF("test_part_amiga: non-bootable Amiga disk\n");

	return 0;
    }
    else
    {
	PRINTF("test_part_amiga: no RDB found\n");
	return -1;
    }

}

/*
 * Find partition number partnum on the given drive.
 */
static struct partition_block *find_partition(block_dev_desc_t *dev_desc, int partnum)
{
    struct rigid_disk_block *rdb;
    struct partition_block *p;
    u32 block;

    PRINTF("Trying to find partition block %d\n", partnum);
    rdb = get_rdisk(dev_desc);
    if (!rdb)
    {
	PRINTF("find_partition: no rdb found\n");
	return NULL;
    }

    PRINTF("find_partition: Scanning partition list\n");

    block = rdb->partition_list;
    PRINTF("find_partition: partition list at 0x%x\n", block);

    while (block != 0xFFFFFFFF)
    {
	ulong res = dev_desc->block_read(dev_desc->dev, block, 1,
					 (ulong *)block_buffer);
	if (res == 1)
	{
	    p = (struct partition_block *)block_buffer;
	    if (p->id == AMIGA_ID_PART)
	    {
		PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
		if (sum_block((struct block_header *)p) == 0)
		{
		    if (partnum == 0) break;
		    else
		    {
			partnum--;
			block = p->next;
		    }
		}
	    } else block = 0xFFFFFFFF;
	} else block = 0xFFFFFFFF;
    }

    if (block == 0xFFFFFFFF)
    {
	PRINTF("PART block not found\n");
	return NULL;
    }

    return (struct partition_block *)block_buffer;
}

/*
 * Get info about a partition
 */
int get_partition_info_amiga (block_dev_desc_t *dev_desc, int part, disk_partition_t *info)
{
    struct partition_block *p = find_partition(dev_desc, part-1);
    struct amiga_part_geometry *g;
    u32 disk_type;

    if (!p) return -1;

    g = (struct amiga_part_geometry *)&(p->environment);
    info->start = g->low_cyl  * g->block_per_track * g->surfaces;
    info->size  = (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1;
    info->blksz = rdb.block_bytes;
    bcpl_strcpy(info->name, p->drive_name);


    disk_type = g->dos_type;

    info->type[0] = (disk_type & 0xFF000000)>>24;
    info->type[1] = (disk_type & 0x00FF0000)>>16;
    info->type[2] = (disk_type & 0x0000FF00)>>8;
    info->type[3] = '\\';
    info->type[4] = (disk_type & 0x000000FF) + '0';
    info->type[5] = 0;

    return 0;
}

void print_part_amiga (block_dev_desc_t *dev_desc)
{
    struct rigid_disk_block *rdb;
    struct bootcode_block *boot;
    struct partition_block *p;
    u32 block;
    int i = 1;

    rdb = get_rdisk(dev_desc);
    if (!rdb)
    {
	PRINTF("print_part_amiga: no rdb found\n");
	return;
    }

    PRINTF("print_part_amiga: Scanning partition list\n");

    block = rdb->partition_list;
    PRINTF("print_part_amiga: partition list at 0x%x\n", block);

    printf("Summary:  DiskBlockSize: %d\n"
	   "          Cylinders    : %d\n"
	   "          Sectors/Track: %d\n"
	   "          Heads        : %d\n\n",
	   rdb->block_bytes, rdb->cylinders, rdb->sectors,
	   rdb->heads);

    printf("                 First   Num. \n"
	   "Nr.  Part. Name  Block   Block  Type        Boot Priority\n");

    while (block != 0xFFFFFFFF)
    {
	ulong res;

	PRINTF("Trying to load block #0x%X\n", block);

	res = dev_desc->block_read(dev_desc->dev, block, 1,
				   (ulong *)block_buffer);
	if (res == 1)
	{
	    p = (struct partition_block *)block_buffer;
	    if (p->id == AMIGA_ID_PART)
	    {
		PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
		if (sum_block((struct block_header *)p) == 0)
		{
		    printf("%-4d ", i); i++;
		    print_part_info(p);
		    block = p->next;
		}
	    } else block = 0xFFFFFFFF;
	} else block = 0xFFFFFFFF;
    }

    boot = get_bootcode(dev_desc);
    if (boot)
    {
	printf("Disk is bootable\n");
    }
}

#endif