2 * partition.c - partition table support
4 * Copyright (C) 2004 Sven Luther
6 * Copyright (C) 2001, 2002 Ethan Benson
8 * Copyright (C) 1999 Benjamin Herrenschmidt
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 * Todo: Add disklabel (or let OF do it ?). Eventually think about
27 * fixing CDROM handling by directly using the ATAPI layer.
35 #include "fdisk-part.h"
36 #include "amiga-part.h"
37 #include "partition.h"
40 #include "linux/iso_fs.h"
44 /* We currently don't check the partition type, some users
45 * are putting crap there and still expect it to work...
47 #undef CHECK_FOR_VALID_MAC_PARTITION_TYPE
49 #ifdef CHECK_FOR_VALID_MAC_PARTITION_TYPE
50 static const char *valid_mac_partition_types[] = {
62 static unsigned long swab32(unsigned long value);
64 #define MAX_BLOCK_SIZE 2048
65 static unsigned char block_buffer[MAX_BLOCK_SIZE];
68 add_new_partition(struct partition_t** list, int part_number, const char *part_type,
69 const char *part_name, unsigned long part_start, unsigned long part_size,
70 unsigned short part_blocksize)
72 struct partition_t* part;
73 part = (struct partition_t*)malloc(sizeof(struct partition_t));
75 part->part_number = part_number;
76 strncpy(part->part_type, part_type, MAX_PART_NAME);
77 strncpy(part->part_name, part_name, MAX_PART_NAME);
78 part->part_start = part_start;
79 part->part_size = part_size;
80 part->blocksize = part_blocksize;
82 /* Tack this entry onto the list */
87 /* Note, we rely on partitions being dev-block-size aligned,
88 * I have to check if it's true. If it's not, then things will get
89 * a bit more complicated
92 partition_mac_lookup( const char *dev_name, prom_handle disk,
93 unsigned int prom_blksize, struct partition_t** list )
97 /* block_buffer contains block 0 from the partitions_lookup() stage */
98 struct mac_partition* part = (struct mac_partition *)block_buffer;
99 unsigned short ptable_block_size =
100 ((struct mac_driver_desc *)block_buffer)->block_size;
103 for (block=1; block < map_size + 1; block++)
105 #ifdef CHECK_FOR_VALID_MAC_PARTITION_TYPE
109 if (prom_readblocks(disk, block, 1, block_buffer) != 1) {
110 prom_printf("Can't read partition %d\n", block);
113 if (part->signature != MAC_PARTITION_MAGIC) {
115 prom_printf("Wrong partition %d signature\n", block);
120 map_size = part->map_count;
122 #ifdef CHECK_FOR_VALID_MAC_PARTITION_TYPE
123 /* We don't bother looking at swap partitions of any type,
124 * and the rest are the ones we know about */
125 for (ptype = valid_mac_partition_types; ptype; ptype++)
126 if (!strcmp (part->type, ptype))
133 prom_printf( "MAC: Unsupported partition #%d; type=%s\n",
139 #ifdef CHECK_FOR_VALID_MAC_PARTITION_TYPE
142 /* We use the partition block size from the partition table.
143 * The filesystem implmentations are responsible for mapping
144 * to their own fs blocksize */
146 list, /* partition list */
147 block, /* partition number */
148 part->type, /* type */
149 part->name, /* name */
150 part->start_block + part->data_start, /* start */
151 part->data_count, /* size */
157 * Same function as partition_mac_lookup(), except for fdisk
161 partition_fdisk_lookup( const char *dev_name, prom_handle disk,
162 unsigned int prom_blksize, struct partition_t** list )
166 /* fdisk partition tables start at offset 0x1be
167 * from byte 0 of the boot drive.
169 struct fdisk_partition* part =
170 (struct fdisk_partition *) (block_buffer + 0x1be);
172 for (partition=1; partition <= 4 ;partition++, part++) {
173 if (part->sys_ind == LINUX_NATIVE) {
174 add_new_partition( list,
178 swab32(*(unsigned int *)(part->start4)),
179 swab32(*(unsigned int *)(part->size4)),
185 /* I don't know if it's possible to handle multisession and other multitrack
186 * stuffs with the current OF disklabel package. This can still be implemented
187 * with direct calls to atapi stuffs.
188 * Currently, we enter this code for any device of block size 0x2048 who lacks
189 * a MacOS partition map signature.
192 identify_iso_fs(ihandle device, unsigned int *iso_root_block)
196 for (block = 16; block < 100; block++) {
197 struct iso_volume_descriptor * vdp;
199 if (prom_readblocks(device, block, 1, block_buffer) != 1) {
200 prom_printf("Can't read volume desc block %d\n", block);
204 vdp = (struct iso_volume_descriptor *)block_buffer;
206 /* Due to the overlapping physical location of the descriptors,
207 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
208 * proper identification in this case, we first check for ISO.
210 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
211 *iso_root_block = block;
220 * Detects and read amiga partition tables.
224 _amiga_checksum (unsigned int blk_size)
228 unsigned int *amiga_block = (unsigned int *) block_buffer;
230 sum = amiga_block[0];
231 end = amiga_block[AMIGA_LENGTH];
233 if (end > blk_size) end = blk_size;
235 for (i = 1; i < end; i++) sum += amiga_block[i];
241 _amiga_find_rdb (const char *dev_name, prom_handle disk, unsigned int prom_blksize)
244 unsigned int *amiga_block = (unsigned int *) block_buffer;
246 for (i = 0; i<AMIGA_RDB_MAX; i++) {
248 if (prom_readblocks(disk, i, 1, block_buffer) != 1) {
249 prom_printf("Can't read boot block %d\n", i);
253 if ((amiga_block[AMIGA_ID] == AMIGA_ID_RDB) && (_amiga_checksum (prom_blksize) == 0))
256 /* Amiga partition table not found, let's reread block 0 */
257 if (prom_readblocks(disk, 0, 1, block_buffer) != 1) {
258 prom_printf("Can't read boot blocks\n");
259 return 0; /* TODO: something bad happened, should fail more verbosely */
265 partition_amiga_lookup( const char *dev_name, prom_handle disk,
266 unsigned int prom_blksize, struct partition_t** list )
269 unsigned int blockspercyl;
270 unsigned int *amiga_block = (unsigned int *) block_buffer;
271 unsigned int *used = NULL;
272 unsigned int possible;
276 blockspercyl = amiga_block[AMIGA_SECT] * amiga_block[AMIGA_HEADS];
277 possible = amiga_block[AMIGA_RDBLIMIT]/32 +1;
279 used = (unsigned int *) malloc (sizeof (unsigned int) * (possible + 1));
281 for (i=0; i < possible; i++) used[i] = 0;
284 for (part = amiga_block[AMIGA_PARTITIONS], partition = 0;
286 part = amiga_block[AMIGA_PART_NEXT], partition++)
288 if (prom_readblocks(disk, part, 1, block_buffer) != 1) {
289 prom_printf("Can't read partition block %d\n", part);
292 checksum = _amiga_checksum (prom_blksize);
293 if ((amiga_block[AMIGA_ID] == AMIGA_ID_PART) &&
295 ((used[part/32] & (0x1 << (part % 32))) == 0))
297 used[part/32] |= (0x1 << (part % 32));
299 prom_printf("Amiga partition table corrupted at block %d\n", part);
300 if (amiga_block[AMIGA_ID] != AMIGA_ID_PART)
301 prom_printf ("block type is not partition but %08x\n", amiga_block[AMIGA_ID]);
303 prom_printf ("block checsum is bad : %d\n", checksum);
304 if ((used[part/32] & (0x1 << (part % 32))) != 0)
305 prom_printf ("partition table is looping, block %d already traveled\n", part);
309 /* We use the partition block size from the partition table.
310 * The filesystem implmentations are responsible for mapping
311 * to their own fs blocksize */
313 list, /* partition list */
314 partition, /* partition number */
317 blockspercyl * amiga_block[AMIGA_PART_LOWCYL], /* start */
318 blockspercyl * (amiga_block[AMIGA_PART_HIGHCYL] - amiga_block[AMIGA_PART_LOWCYL] + 1), /* size */
324 partitions_lookup(const char *device)
327 struct mac_driver_desc *desc = (struct mac_driver_desc *)block_buffer;
328 struct partition_t* list = NULL;
329 unsigned int prom_blksize, iso_root_block;
331 strncpy(block_buffer, device, 2040);
332 strcat(block_buffer, ":0");
335 disk = prom_open(block_buffer);
337 prom_printf("Can't open device <%s>\n", block_buffer);
340 prom_blksize = prom_getblksize(disk);
341 DEBUG_F("block size of device is %d\n", prom_blksize);
343 if (prom_blksize <= 1)
345 if (prom_blksize > MAX_BLOCK_SIZE) {
346 prom_printf("block_size %d not supported !\n", prom_blksize);
350 /* Read boot blocs */
351 if (prom_readblocks(disk, 0, 1, block_buffer) != 1) {
352 prom_printf("Can't read boot blocks\n");
355 if (desc->signature == MAC_DRIVER_MAGIC) {
356 /* pdisk partition format */
357 partition_mac_lookup(device, disk, prom_blksize, &list);
358 } else if ((block_buffer[510] == 0x55) && (block_buffer[511] == 0xaa)) {
359 /* fdisk partition format */
360 partition_fdisk_lookup(device, disk, prom_blksize, &list);
361 } else if (prom_blksize == 2048 && identify_iso_fs(disk, &iso_root_block)) {
362 add_new_partition(&list,
369 prom_printf("ISO9660 disk\n");
370 } else if (_amiga_find_rdb(device, disk, prom_blksize) != -1) {
371 /* amiga partition format */
372 partition_amiga_lookup(device, disk, prom_blksize, &list);
374 prom_printf("No supported partition table detected\n");
385 get_part_type(char *device, int partition)
387 struct partition_t* parts;
388 struct partition_t* p;
389 struct partition_t* found;
392 if (prom_get_devtype(device) != FILE_DEVICE_BLOCK)
395 parts = partitions_lookup(device);
401 for (p = parts; p && !found; p=p->next) {
402 DEBUG_F("number: %02d, start: 0x%08lx, length: 0x%08lx, type: %s, name: %s\n",
403 p->part_number, p->part_start, p->part_size, p->part_type, p->part_name);
404 if ((partition >= 0) && (partition == p->part_number)) {
405 type = strdup(p->part_type);
410 partitions_free(parts);
414 /* Freed in reverse order of allocation to help malloc'ator */
416 partitions_free(struct partition_t* list)
418 struct partition_t* next;
427 swab32(unsigned long value)
431 __asm__("rlwimi %0,%1,24,16,23\n\t"
432 "rlwimi %0,%1,8,8,15\n\t"
433 "rlwimi %0,%1,24,0,7"
435 : "r" (value), "0" (value >> 24));
442 * c-file-style: "k&r"