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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/partitions/acorn.c
3 *
4 * Copyright (c) 1996-2000 Russell King.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Scan ADFS partitions on hard disk drives. Unfortunately, there
11 * isn't a standard for partitioning drives on Acorn machines, so
12 * every single manufacturer of SCSI and IDE cards created their own
13 * method.
14 */
15#include <linux/config.h>
16#include <linux/buffer_head.h>
17#include <linux/adfs_fs.h>
18
19#include "check.h"
20#include "acorn.h"
21
22/*
23 * Partition types. (Oh for reusability)
24 */
25#define PARTITION_RISCIX_MFM 1
26#define PARTITION_RISCIX_SCSI 2
27#define PARTITION_LINUX 9
28
29static struct adfs_discrecord *
30adfs_partition(struct parsed_partitions *state, char *name, char *data,
31 unsigned long first_sector, int slot)
32{
33 struct adfs_discrecord *dr;
34 unsigned int nr_sects;
35
36 if (adfs_checkbblk(data))
37 return NULL;
38
39 dr = (struct adfs_discrecord *)(data + 0x1c0);
40
41 if (dr->disc_size == 0 && dr->disc_size_high == 0)
42 return NULL;
43
44 nr_sects = (le32_to_cpu(dr->disc_size_high) << 23) |
45 (le32_to_cpu(dr->disc_size) >> 9);
46
47 if (name)
48 printk(" [%s]", name);
49 put_partition(state, slot, first_sector, nr_sects);
50 return dr;
51}
52
53#ifdef CONFIG_ACORN_PARTITION_RISCIX
54
55struct riscix_part {
56 __le32 start;
57 __le32 length;
58 __le32 one;
59 char name[16];
60};
61
62struct riscix_record {
63 __le32 magic;
64#define RISCIX_MAGIC cpu_to_le32(0x4a657320)
65 __le32 date;
66 struct riscix_part part[8];
67};
68
69static int
70riscix_partition(struct parsed_partitions *state, struct block_device *bdev,
71 unsigned long first_sect, int slot, unsigned long nr_sects)
72{
73 Sector sect;
74 struct riscix_record *rr;
75
76 rr = (struct riscix_record *)read_dev_sector(bdev, first_sect, &sect);
77 if (!rr)
78 return -1;
79
80 printk(" [RISCiX]");
81
82
83 if (rr->magic == RISCIX_MAGIC) {
84 unsigned long size = nr_sects > 2 ? 2 : nr_sects;
85 int part;
86
87 printk(" <");
88
89 put_partition(state, slot++, first_sect, size);
90 for (part = 0; part < 8; part++) {
91 if (rr->part[part].one &&
92 memcmp(rr->part[part].name, "All\0", 4)) {
93 put_partition(state, slot++,
94 le32_to_cpu(rr->part[part].start),
95 le32_to_cpu(rr->part[part].length));
96 printk("(%s)", rr->part[part].name);
97 }
98 }
99
100 printk(" >\n");
101 } else {
102 put_partition(state, slot++, first_sect, nr_sects);
103 }
104
105 put_dev_sector(sect);
106 return slot;
107}
108#endif
109
110#define LINUX_NATIVE_MAGIC 0xdeafa1de
111#define LINUX_SWAP_MAGIC 0xdeafab1e
112
113struct linux_part {
114 __le32 magic;
115 __le32 start_sect;
116 __le32 nr_sects;
117};
118
119static int
120linux_partition(struct parsed_partitions *state, struct block_device *bdev,
121 unsigned long first_sect, int slot, unsigned long nr_sects)
122{
123 Sector sect;
124 struct linux_part *linuxp;
125 unsigned long size = nr_sects > 2 ? 2 : nr_sects;
126
127 printk(" [Linux]");
128
129 put_partition(state, slot++, first_sect, size);
130
131 linuxp = (struct linux_part *)read_dev_sector(bdev, first_sect, &sect);
132 if (!linuxp)
133 return -1;
134
135 printk(" <");
136 while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) ||
137 linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) {
138 if (slot == state->limit)
139 break;
140 put_partition(state, slot++, first_sect +
141 le32_to_cpu(linuxp->start_sect),
142 le32_to_cpu(linuxp->nr_sects));
143 linuxp ++;
144 }
145 printk(" >");
146
147 put_dev_sector(sect);
148 return slot;
149}
150
151#ifdef CONFIG_ACORN_PARTITION_CUMANA
152int
153adfspart_check_CUMANA(struct parsed_partitions *state, struct block_device *bdev)
154{
155 unsigned long first_sector = 0;
156 unsigned int start_blk = 0;
157 Sector sect;
158 unsigned char *data;
159 char *name = "CUMANA/ADFS";
160 int first = 1;
161 int slot = 1;
162
163 /*
164 * Try Cumana style partitions - sector 6 contains ADFS boot block
165 * with pointer to next 'drive'.
166 *
167 * There are unknowns in this code - is the 'cylinder number' of the
168 * next partition relative to the start of this one - I'm assuming
169 * it is.
170 *
171 * Also, which ID did Cumana use?
172 *
173 * This is totally unfinished, and will require more work to get it
174 * going. Hence it is totally untested.
175 */
176 do {
177 struct adfs_discrecord *dr;
178 unsigned int nr_sects;
179
180 data = read_dev_sector(bdev, start_blk * 2 + 6, &sect);
181 if (!data)
182 return -1;
183
184 if (slot == state->limit)
185 break;
186
187 dr = adfs_partition(state, name, data, first_sector, slot++);
188 if (!dr)
189 break;
190
191 name = NULL;
192
193 nr_sects = (data[0x1fd] + (data[0x1fe] << 8)) *
194 (dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) *
195 dr->secspertrack;
196
197 if (!nr_sects)
198 break;
199
200 first = 0;
201 first_sector += nr_sects;
202 start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9);
203 nr_sects = 0; /* hmm - should be partition size */
204
205 switch (data[0x1fc] & 15) {
206 case 0: /* No partition / ADFS? */
207 break;
208
209#ifdef CONFIG_ACORN_PARTITION_RISCIX
210 case PARTITION_RISCIX_SCSI:
211 /* RISCiX - we don't know how to find the next one. */
212 slot = riscix_partition(state, bdev, first_sector,
213 slot, nr_sects);
214 break;
215#endif
216
217 case PARTITION_LINUX:
218 slot = linux_partition(state, bdev, first_sector,
219 slot, nr_sects);
220 break;
221 }
222 put_dev_sector(sect);
223 if (slot == -1)
224 return -1;
225 } while (1);
226 put_dev_sector(sect);
227 return first ? 0 : 1;
228}
229#endif
230
231#ifdef CONFIG_ACORN_PARTITION_ADFS
232/*
233 * Purpose: allocate ADFS partitions.
234 *
235 * Params : hd - pointer to gendisk structure to store partition info.
236 * dev - device number to access.
237 *
238 * Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok.
239 *
240 * Alloc : hda = whole drive
241 * hda1 = ADFS partition on first drive.
242 * hda2 = non-ADFS partition.
243 */
244int
245adfspart_check_ADFS(struct parsed_partitions *state, struct block_device *bdev)
246{
247 unsigned long start_sect, nr_sects, sectscyl, heads;
248 Sector sect;
249 unsigned char *data;
250 struct adfs_discrecord *dr;
251 unsigned char id;
252 int slot = 1;
253
254 data = read_dev_sector(bdev, 6, &sect);
255 if (!data)
256 return -1;
257
258 dr = adfs_partition(state, "ADFS", data, 0, slot++);
259 if (!dr) {
260 put_dev_sector(sect);
261 return 0;
262 }
263
264 heads = dr->heads + ((dr->lowsector >> 6) & 1);
265 sectscyl = dr->secspertrack * heads;
266 start_sect = ((data[0x1fe] << 8) + data[0x1fd]) * sectscyl;
267 id = data[0x1fc] & 15;
268 put_dev_sector(sect);
269
270#ifdef CONFIG_BLK_DEV_MFM
271 if (MAJOR(bdev->bd_dev) == MFM_ACORN_MAJOR) {
272 extern void xd_set_geometry(struct block_device *,
273 unsigned char, unsigned char, unsigned int);
274 xd_set_geometry(bdev, dr->secspertrack, heads, 1);
275 invalidate_bdev(bdev, 1);
276 truncate_inode_pages(bdev->bd_inode->i_mapping, 0);
277 }
278#endif
279
280 /*
281 * Work out start of non-adfs partition.
282 */
283 nr_sects = (bdev->bd_inode->i_size >> 9) - start_sect;
284
285 if (start_sect) {
286 switch (id) {
287#ifdef CONFIG_ACORN_PARTITION_RISCIX
288 case PARTITION_RISCIX_SCSI:
289 case PARTITION_RISCIX_MFM:
290 slot = riscix_partition(state, bdev, start_sect,
291 slot, nr_sects);
292 break;
293#endif
294
295 case PARTITION_LINUX:
296 slot = linux_partition(state, bdev, start_sect,
297 slot, nr_sects);
298 break;
299 }
300 }
301 printk("\n");
302 return 1;
303}
304#endif
305
306#ifdef CONFIG_ACORN_PARTITION_ICS
307
308struct ics_part {
309 __le32 start;
310 __le32 size;
311};
312
313static int adfspart_check_ICSLinux(struct block_device *bdev, unsigned long block)
314{
315 Sector sect;
316 unsigned char *data = read_dev_sector(bdev, block, &sect);
317 int result = 0;
318
319 if (data) {
320 if (memcmp(data, "LinuxPart", 9) == 0)
321 result = 1;
322 put_dev_sector(sect);
323 }
324
325 return result;
326}
327
328/*
329 * Check for a valid ICS partition using the checksum.
330 */
331static inline int valid_ics_sector(const unsigned char *data)
332{
333 unsigned long sum;
334 int i;
335
336 for (i = 0, sum = 0x50617274; i < 508; i++)
337 sum += data[i];
338
339 sum -= le32_to_cpu(*(__le32 *)(&data[508]));
340
341 return sum == 0;
342}
343
344/*
345 * Purpose: allocate ICS partitions.
346 * Params : hd - pointer to gendisk structure to store partition info.
347 * dev - device number to access.
348 * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
349 * Alloc : hda = whole drive
350 * hda1 = ADFS partition 0 on first drive.
351 * hda2 = ADFS partition 1 on first drive.
352 * ..etc..
353 */
354int
355adfspart_check_ICS(struct parsed_partitions *state, struct block_device *bdev)
356{
357 const unsigned char *data;
358 const struct ics_part *p;
359 int slot;
360 Sector sect;
361
362 /*
363 * Try ICS style partitions - sector 0 contains partition info.
364 */
365 data = read_dev_sector(bdev, 0, &sect);
366 if (!data)
367 return -1;
368
369 if (!valid_ics_sector(data)) {
370 put_dev_sector(sect);
371 return 0;
372 }
373
374 printk(" [ICS]");
375
376 for (slot = 1, p = (const struct ics_part *)data; p->size; p++) {
377 u32 start = le32_to_cpu(p->start);
378 s32 size = le32_to_cpu(p->size); /* yes, it's signed. */
379
380 if (slot == state->limit)
381 break;
382
383 /*
384 * Negative sizes tell the RISC OS ICS driver to ignore
385 * this partition - in effect it says that this does not
386 * contain an ADFS filesystem.
387 */
388 if (size < 0) {
389 size = -size;
390
391 /*
392 * Our own extension - We use the first sector
393 * of the partition to identify what type this
394 * partition is. We must not make this visible
395 * to the filesystem.
396 */
397 if (size > 1 && adfspart_check_ICSLinux(bdev, start)) {
398 start += 1;
399 size -= 1;
400 }
401 }
402
403 if (size)
404 put_partition(state, slot++, start, size);
405 }
406
407 put_dev_sector(sect);
408 printk("\n");
409 return 1;
410}
411#endif
412
413#ifdef CONFIG_ACORN_PARTITION_POWERTEC
414struct ptec_part {
415 __le32 unused1;
416 __le32 unused2;
417 __le32 start;
418 __le32 size;
419 __le32 unused5;
420 char type[8];
421};
422
423static inline int valid_ptec_sector(const unsigned char *data)
424{
425 unsigned char checksum = 0x2a;
426 int i;
427
428 /*
429 * If it looks like a PC/BIOS partition, then it
430 * probably isn't PowerTec.
431 */
432 if (data[510] == 0x55 && data[511] == 0xaa)
433 return 0;
434
435 for (i = 0; i < 511; i++)
436 checksum += data[i];
437
438 return checksum == data[511];
439}
440
441/*
442 * Purpose: allocate ICS partitions.
443 * Params : hd - pointer to gendisk structure to store partition info.
444 * dev - device number to access.
445 * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
446 * Alloc : hda = whole drive
447 * hda1 = ADFS partition 0 on first drive.
448 * hda2 = ADFS partition 1 on first drive.
449 * ..etc..
450 */
451int
452adfspart_check_POWERTEC(struct parsed_partitions *state, struct block_device *bdev)
453{
454 Sector sect;
455 const unsigned char *data;
456 const struct ptec_part *p;
457 int slot = 1;
458 int i;
459
460 data = read_dev_sector(bdev, 0, &sect);
461 if (!data)
462 return -1;
463
464 if (!valid_ptec_sector(data)) {
465 put_dev_sector(sect);
466 return 0;
467 }
468
469 printk(" [POWERTEC]");
470
471 for (i = 0, p = (const struct ptec_part *)data; i < 12; i++, p++) {
472 u32 start = le32_to_cpu(p->start);
473 u32 size = le32_to_cpu(p->size);
474
475 if (size)
476 put_partition(state, slot++, start, size);
477 }
478
479 put_dev_sector(sect);
480 printk("\n");
481 return 1;
482}
483#endif
484
485#ifdef CONFIG_ACORN_PARTITION_EESOX
486struct eesox_part {
487 char magic[6];
488 char name[10];
489 __le32 start;
490 __le32 unused6;
491 __le32 unused7;
492 __le32 unused8;
493};
494
495/*
496 * Guess who created this format?
497 */
498static const char eesox_name[] = {
499 'N', 'e', 'i', 'l', ' ',
500 'C', 'r', 'i', 't', 'c', 'h', 'e', 'l', 'l', ' ', ' '
501};
502
503/*
504 * EESOX SCSI partition format.
505 *
506 * This is a goddamned awful partition format. We don't seem to store
507 * the size of the partition in this table, only the start addresses.
508 *
509 * There are two possibilities where the size comes from:
510 * 1. The individual ADFS boot block entries that are placed on the disk.
511 * 2. The start address of the next entry.
512 */
513int
514adfspart_check_EESOX(struct parsed_partitions *state, struct block_device *bdev)
515{
516 Sector sect;
517 const unsigned char *data;
518 unsigned char buffer[256];
519 struct eesox_part *p;
520 sector_t start = 0;
521 int i, slot = 1;
522
523 data = read_dev_sector(bdev, 7, &sect);
524 if (!data)
525 return -1;
526
527 /*
528 * "Decrypt" the partition table. God knows why...
529 */
530 for (i = 0; i < 256; i++)
531 buffer[i] = data[i] ^ eesox_name[i & 15];
532
533 put_dev_sector(sect);
534
535 for (i = 0, p = (struct eesox_part *)buffer; i < 8; i++, p++) {
536 sector_t next;
537
538 if (memcmp(p->magic, "Eesox", 6))
539 break;
540
541 next = le32_to_cpu(p->start);
542 if (i)
543 put_partition(state, slot++, start, next - start);
544 start = next;
545 }
546
547 if (i != 0) {
548 sector_t size;
549
550 size = get_capacity(bdev->bd_disk);
551 put_partition(state, slot++, start, size - start);
552 printk("\n");
553 }
554
555 return i ? 1 : 0;
556}
557#endif