3
* Hans-Joerg Frieden, Hyperion Entertainment
4
* Hans-JoergF@hyperion-entertainment.com
6
* SPDX-License-Identifier: GPL-2.0+
11
#include "part_amiga.h"
13
#ifdef HAVE_BLOCK_DEVICE
18
#define PRINTF(fmt, args...) printf(fmt ,##args)
20
#define PRINTF(fmt, args...)
30
static unsigned char block_buffer[DEFAULT_SECTOR_SIZE];
31
static struct rigid_disk_block rdb = {0};
32
static struct bootcode_block bootcode = {0};
35
* Copy a bcpl to a c string
37
static void bcpl_strcpy(char *to, char *from)
50
* Print a BCPL String. BCPL strings start with a byte with the length
51
* of the string, and don't contain a terminating nul character
53
static void bstr_print(char *string)
62
buffer[i++] = *string++;
67
printf("%-10s", buffer);
71
* Sum a block. The checksum of a block must end up at zero
72
* to be valid. The chk_sum field is selected so that adding
75
int sum_block(struct block_header *header)
77
s32 *block = (s32 *)header;
81
for (i = 0; i < header->summed_longs; i++)
88
* Print an AmigaOS disk type. Disk types are a four-byte identifier
89
* describing the file system. They are usually written as a three-letter
90
* word followed by a backslash and a version number. For example,
91
* DOS\0 would be the original file system. SFS\0 would be SmartFileSystem.
94
static void print_disk_type(u32 disk_type)
97
buffer[0] = (disk_type & 0xFF000000)>>24;
98
buffer[1] = (disk_type & 0x00FF0000)>>16;
99
buffer[2] = (disk_type & 0x0000FF00)>>8;
101
buffer[4] = (disk_type & 0x000000FF) + '0';
103
printf("%s", buffer);
107
* Print the info contained within the given partition block
109
static void print_part_info(struct partition_block *p)
111
struct amiga_part_geometry *g;
113
g = (struct amiga_part_geometry *)&(p->environment);
115
bstr_print(p->drive_name);
117
g->low_cyl * g->block_per_track * g->surfaces ,
118
(g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1);
119
print_disk_type(g->dos_type);
120
printf("\t%5d\n", g->boot_priority);
124
* Search for the Rigid Disk Block. The rigid disk block is required
125
* to be within the first 16 blocks of a drive, needs to have
126
* the ID AMIGA_ID_RDISK ('RDSK') and needs to have a valid
127
* sum-to-zero checksum
129
struct rigid_disk_block *get_rdisk(block_dev_desc_t *dev_desc)
135
s = getenv("amiga_scanlimit");
137
limit = simple_strtoul(s, NULL, 10);
139
limit = AMIGA_BLOCK_LIMIT;
141
for (i=0; i<limit; i++)
143
ulong res = dev_desc->block_read(dev_desc->dev, i, 1,
144
(ulong *)block_buffer);
147
struct rigid_disk_block *trdb = (struct rigid_disk_block *)block_buffer;
148
if (trdb->id == AMIGA_ID_RDISK)
150
PRINTF("Rigid disk block suspect at %d, checking checksum\n",i);
151
if (sum_block((struct block_header *)block_buffer) == 0)
154
memcpy(&rdb, trdb, sizeof(struct rigid_disk_block));
155
return (struct rigid_disk_block *)&rdb;
160
PRINTF("Done scanning, no RDB found\n");
165
* Search for boot code
166
* Again, the first boot block must be located somewhere in the first 16 blocks, or rooted in the
170
struct bootcode_block *get_bootcode(block_dev_desc_t *dev_desc)
176
s = getenv("amiga_scanlimit");
178
limit = simple_strtoul(s, NULL, 10);
180
limit = AMIGA_BLOCK_LIMIT;
182
PRINTF("Scanning for BOOT from 0 to %d\n", limit);
184
for (i = 0; i < limit; i++)
186
ulong res = dev_desc->block_read(dev_desc->dev, i, 1, (ulong *)block_buffer);
189
struct bootcode_block *boot = (struct bootcode_block *)block_buffer;
190
if (boot->id == AMIGA_ID_BOOT)
192
PRINTF("BOOT block at %d, checking checksum\n", i);
193
if (sum_block((struct block_header *)block_buffer) == 0)
195
PRINTF("Found valid bootcode block\n");
196
memcpy(&bootcode, boot, sizeof(struct bootcode_block));
203
PRINTF("No boot code found on disk\n");
208
* Test if the given partition has an Amiga partition table/Rigid
211
int test_part_amiga(block_dev_desc_t *dev_desc)
213
struct rigid_disk_block *rdb;
214
struct bootcode_block *bootcode;
216
PRINTF("test_part_amiga: Testing for an Amiga RDB partition\n");
218
rdb = get_rdisk(dev_desc);
221
bootcode = get_bootcode(dev_desc);
223
PRINTF("test_part_amiga: bootable Amiga disk\n");
225
PRINTF("test_part_amiga: non-bootable Amiga disk\n");
231
PRINTF("test_part_amiga: no RDB found\n");
238
* Find partition number partnum on the given drive.
240
static struct partition_block *find_partition(block_dev_desc_t *dev_desc, int partnum)
242
struct rigid_disk_block *rdb;
243
struct partition_block *p;
246
PRINTF("Trying to find partition block %d\n", partnum);
247
rdb = get_rdisk(dev_desc);
250
PRINTF("find_partition: no rdb found\n");
254
PRINTF("find_partition: Scanning partition list\n");
256
block = rdb->partition_list;
257
PRINTF("find_partition: partition list at 0x%x\n", block);
259
while (block != 0xFFFFFFFF)
261
ulong res = dev_desc->block_read(dev_desc->dev, block, 1,
262
(ulong *)block_buffer);
265
p = (struct partition_block *)block_buffer;
266
if (p->id == AMIGA_ID_PART)
268
PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
269
if (sum_block((struct block_header *)p) == 0)
271
if (partnum == 0) break;
278
} else block = 0xFFFFFFFF;
279
} else block = 0xFFFFFFFF;
282
if (block == 0xFFFFFFFF)
284
PRINTF("PART block not found\n");
288
return (struct partition_block *)block_buffer;
292
* Get info about a partition
294
int get_partition_info_amiga (block_dev_desc_t *dev_desc, int part, disk_partition_t *info)
296
struct partition_block *p = find_partition(dev_desc, part-1);
297
struct amiga_part_geometry *g;
302
g = (struct amiga_part_geometry *)&(p->environment);
303
info->start = g->low_cyl * g->block_per_track * g->surfaces;
304
info->size = (g->high_cyl - g->low_cyl + 1) * g->block_per_track * g->surfaces - 1;
305
info->blksz = rdb.block_bytes;
306
bcpl_strcpy(info->name, p->drive_name);
309
disk_type = g->dos_type;
311
info->type[0] = (disk_type & 0xFF000000)>>24;
312
info->type[1] = (disk_type & 0x00FF0000)>>16;
313
info->type[2] = (disk_type & 0x0000FF00)>>8;
314
info->type[3] = '\\';
315
info->type[4] = (disk_type & 0x000000FF) + '0';
321
void print_part_amiga (block_dev_desc_t *dev_desc)
323
struct rigid_disk_block *rdb;
324
struct bootcode_block *boot;
325
struct partition_block *p;
329
rdb = get_rdisk(dev_desc);
332
PRINTF("print_part_amiga: no rdb found\n");
336
PRINTF("print_part_amiga: Scanning partition list\n");
338
block = rdb->partition_list;
339
PRINTF("print_part_amiga: partition list at 0x%x\n", block);
341
printf("Summary: DiskBlockSize: %d\n"
343
" Sectors/Track: %d\n"
345
rdb->block_bytes, rdb->cylinders, rdb->sectors,
348
printf(" First Num. \n"
349
"Nr. Part. Name Block Block Type Boot Priority\n");
351
while (block != 0xFFFFFFFF)
355
PRINTF("Trying to load block #0x%X\n", block);
357
res = dev_desc->block_read(dev_desc->dev, block, 1,
358
(ulong *)block_buffer);
361
p = (struct partition_block *)block_buffer;
362
if (p->id == AMIGA_ID_PART)
364
PRINTF("PART block suspect at 0x%x, checking checksum\n",block);
365
if (sum_block((struct block_header *)p) == 0)
367
printf("%-4d ", i); i++;
371
} else block = 0xFFFFFFFF;
372
} else block = 0xFFFFFFFF;
375
boot = get_bootcode(dev_desc);
378
printf("Disk is bootable\n");