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1/*
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/buffer_head.h>
16#include <linux/adfs_fs.h>
17
18#include "check.h"
19#include "acorn.h"
20
21/*
22 * Partition types. (Oh for reusability)
23 */
24#define PARTITION_RISCIX_MFM 1
25#define PARTITION_RISCIX_SCSI 2
26#define PARTITION_LINUX 9
27
28#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
29 defined(CONFIG_ACORN_PARTITION_ADFS)
30static struct adfs_discrecord *
31adfs_partition(struct parsed_partitions *state, char *name, char *data,
32 unsigned long first_sector, int slot)
33{
34 struct adfs_discrecord *dr;
35 unsigned int nr_sects;
36
37 if (adfs_checkbblk(data))
38 return NULL;
39
40 dr = (struct adfs_discrecord *)(data + 0x1c0);
41
42 if (dr->disc_size == 0 && dr->disc_size_high == 0)
43 return NULL;
44
45 nr_sects = (le32_to_cpu(dr->disc_size_high) << 23) |
46 (le32_to_cpu(dr->disc_size) >> 9);
47
48 if (name) {
49 strlcat(state->pp_buf, " [", PAGE_SIZE);
50 strlcat(state->pp_buf, name, PAGE_SIZE);
51 strlcat(state->pp_buf, "]", PAGE_SIZE);
52 }
53 put_partition(state, slot, first_sector, nr_sects);
54 return dr;
55}
56#endif
57
58#ifdef CONFIG_ACORN_PARTITION_RISCIX
59
60struct riscix_part {
61 __le32 start;
62 __le32 length;
63 __le32 one;
64 char name[16];
65};
66
67struct riscix_record {
68 __le32 magic;
69#define RISCIX_MAGIC cpu_to_le32(0x4a657320)
70 __le32 date;
71 struct riscix_part part[8];
72};
73
74#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
75 defined(CONFIG_ACORN_PARTITION_ADFS)
76static int riscix_partition(struct parsed_partitions *state,
77 unsigned long first_sect, int slot,
78 unsigned long nr_sects)
79{
80 Sector sect;
81 struct riscix_record *rr;
82
83 rr = read_part_sector(state, first_sect, §);
84 if (!rr)
85 return -1;
86
87 strlcat(state->pp_buf, " [RISCiX]", PAGE_SIZE);
88
89
90 if (rr->magic == RISCIX_MAGIC) {
91 unsigned long size = nr_sects > 2 ? 2 : nr_sects;
92 int part;
93
94 strlcat(state->pp_buf, " <", PAGE_SIZE);
95
96 put_partition(state, slot++, first_sect, size);
97 for (part = 0; part < 8; part++) {
98 if (rr->part[part].one &&
99 memcmp(rr->part[part].name, "All\0", 4)) {
100 put_partition(state, slot++,
101 le32_to_cpu(rr->part[part].start),
102 le32_to_cpu(rr->part[part].length));
103 strlcat(state->pp_buf, "(", PAGE_SIZE);
104 strlcat(state->pp_buf, rr->part[part].name, PAGE_SIZE);
105 strlcat(state->pp_buf, ")", PAGE_SIZE);
106 }
107 }
108
109 strlcat(state->pp_buf, " >\n", PAGE_SIZE);
110 } else {
111 put_partition(state, slot++, first_sect, nr_sects);
112 }
113
114 put_dev_sector(sect);
115 return slot;
116}
117#endif
118#endif
119
120#define LINUX_NATIVE_MAGIC 0xdeafa1de
121#define LINUX_SWAP_MAGIC 0xdeafab1e
122
123struct linux_part {
124 __le32 magic;
125 __le32 start_sect;
126 __le32 nr_sects;
127};
128
129#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
130 defined(CONFIG_ACORN_PARTITION_ADFS)
131static int linux_partition(struct parsed_partitions *state,
132 unsigned long first_sect, int slot,
133 unsigned long nr_sects)
134{
135 Sector sect;
136 struct linux_part *linuxp;
137 unsigned long size = nr_sects > 2 ? 2 : nr_sects;
138
139 strlcat(state->pp_buf, " [Linux]", PAGE_SIZE);
140
141 put_partition(state, slot++, first_sect, size);
142
143 linuxp = read_part_sector(state, first_sect, §);
144 if (!linuxp)
145 return -1;
146
147 strlcat(state->pp_buf, " <", PAGE_SIZE);
148 while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) ||
149 linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) {
150 if (slot == state->limit)
151 break;
152 put_partition(state, slot++, first_sect +
153 le32_to_cpu(linuxp->start_sect),
154 le32_to_cpu(linuxp->nr_sects));
155 linuxp ++;
156 }
157 strlcat(state->pp_buf, " >", PAGE_SIZE);
158
159 put_dev_sector(sect);
160 return slot;
161}
162#endif
163
164#ifdef CONFIG_ACORN_PARTITION_CUMANA
165int adfspart_check_CUMANA(struct parsed_partitions *state)
166{
167 unsigned long first_sector = 0;
168 unsigned int start_blk = 0;
169 Sector sect;
170 unsigned char *data;
171 char *name = "CUMANA/ADFS";
172 int first = 1;
173 int slot = 1;
174
175 /*
176 * Try Cumana style partitions - sector 6 contains ADFS boot block
177 * with pointer to next 'drive'.
178 *
179 * There are unknowns in this code - is the 'cylinder number' of the
180 * next partition relative to the start of this one - I'm assuming
181 * it is.
182 *
183 * Also, which ID did Cumana use?
184 *
185 * This is totally unfinished, and will require more work to get it
186 * going. Hence it is totally untested.
187 */
188 do {
189 struct adfs_discrecord *dr;
190 unsigned int nr_sects;
191
192 data = read_part_sector(state, start_blk * 2 + 6, §);
193 if (!data)
194 return -1;
195
196 if (slot == state->limit)
197 break;
198
199 dr = adfs_partition(state, name, data, first_sector, slot++);
200 if (!dr)
201 break;
202
203 name = NULL;
204
205 nr_sects = (data[0x1fd] + (data[0x1fe] << 8)) *
206 (dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) *
207 dr->secspertrack;
208
209 if (!nr_sects)
210 break;
211
212 first = 0;
213 first_sector += nr_sects;
214 start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9);
215 nr_sects = 0; /* hmm - should be partition size */
216
217 switch (data[0x1fc] & 15) {
218 case 0: /* No partition / ADFS? */
219 break;
220
221#ifdef CONFIG_ACORN_PARTITION_RISCIX
222 case PARTITION_RISCIX_SCSI:
223 /* RISCiX - we don't know how to find the next one. */
224 slot = riscix_partition(state, first_sector, slot,
225 nr_sects);
226 break;
227#endif
228
229 case PARTITION_LINUX:
230 slot = linux_partition(state, first_sector, slot,
231 nr_sects);
232 break;
233 }
234 put_dev_sector(sect);
235 if (slot == -1)
236 return -1;
237 } while (1);
238 put_dev_sector(sect);
239 return first ? 0 : 1;
240}
241#endif
242
243#ifdef CONFIG_ACORN_PARTITION_ADFS
244/*
245 * Purpose: allocate ADFS partitions.
246 *
247 * Params : hd - pointer to gendisk structure to store partition info.
248 * dev - device number to access.
249 *
250 * Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok.
251 *
252 * Alloc : hda = whole drive
253 * hda1 = ADFS partition on first drive.
254 * hda2 = non-ADFS partition.
255 */
256int adfspart_check_ADFS(struct parsed_partitions *state)
257{
258 unsigned long start_sect, nr_sects, sectscyl, heads;
259 Sector sect;
260 unsigned char *data;
261 struct adfs_discrecord *dr;
262 unsigned char id;
263 int slot = 1;
264
265 data = read_part_sector(state, 6, §);
266 if (!data)
267 return -1;
268
269 dr = adfs_partition(state, "ADFS", data, 0, slot++);
270 if (!dr) {
271 put_dev_sector(sect);
272 return 0;
273 }
274
275 heads = dr->heads + ((dr->lowsector >> 6) & 1);
276 sectscyl = dr->secspertrack * heads;
277 start_sect = ((data[0x1fe] << 8) + data[0x1fd]) * sectscyl;
278 id = data[0x1fc] & 15;
279 put_dev_sector(sect);
280
281 /*
282 * Work out start of non-adfs partition.
283 */
284 nr_sects = (state->bdev->bd_inode->i_size >> 9) - start_sect;
285
286 if (start_sect) {
287 switch (id) {
288#ifdef CONFIG_ACORN_PARTITION_RISCIX
289 case PARTITION_RISCIX_SCSI:
290 case PARTITION_RISCIX_MFM:
291 slot = riscix_partition(state, start_sect, slot,
292 nr_sects);
293 break;
294#endif
295
296 case PARTITION_LINUX:
297 slot = linux_partition(state, start_sect, slot,
298 nr_sects);
299 break;
300 }
301 }
302 strlcat(state->pp_buf, "\n", PAGE_SIZE);
303 return 1;
304}
305#endif
306
307#ifdef CONFIG_ACORN_PARTITION_ICS
308
309struct ics_part {
310 __le32 start;
311 __le32 size;
312};
313
314static int adfspart_check_ICSLinux(struct parsed_partitions *state,
315 unsigned long block)
316{
317 Sector sect;
318 unsigned char *data = read_part_sector(state, block, §);
319 int result = 0;
320
321 if (data) {
322 if (memcmp(data, "LinuxPart", 9) == 0)
323 result = 1;
324 put_dev_sector(sect);
325 }
326
327 return result;
328}
329
330/*
331 * Check for a valid ICS partition using the checksum.
332 */
333static inline int valid_ics_sector(const unsigned char *data)
334{
335 unsigned long sum;
336 int i;
337
338 for (i = 0, sum = 0x50617274; i < 508; i++)
339 sum += data[i];
340
341 sum -= le32_to_cpu(*(__le32 *)(&data[508]));
342
343 return sum == 0;
344}
345
346/*
347 * Purpose: allocate ICS partitions.
348 * Params : hd - pointer to gendisk structure to store partition info.
349 * dev - device number to access.
350 * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
351 * Alloc : hda = whole drive
352 * hda1 = ADFS partition 0 on first drive.
353 * hda2 = ADFS partition 1 on first drive.
354 * ..etc..
355 */
356int adfspart_check_ICS(struct parsed_partitions *state)
357{
358 const unsigned char *data;
359 const struct ics_part *p;
360 int slot;
361 Sector sect;
362
363 /*
364 * Try ICS style partitions - sector 0 contains partition info.
365 */
366 data = read_part_sector(state, 0, §);
367 if (!data)
368 return -1;
369
370 if (!valid_ics_sector(data)) {
371 put_dev_sector(sect);
372 return 0;
373 }
374
375 strlcat(state->pp_buf, " [ICS]", PAGE_SIZE);
376
377 for (slot = 1, p = (const struct ics_part *)data; p->size; p++) {
378 u32 start = le32_to_cpu(p->start);
379 s32 size = le32_to_cpu(p->size); /* yes, it's signed. */
380
381 if (slot == state->limit)
382 break;
383
384 /*
385 * Negative sizes tell the RISC OS ICS driver to ignore
386 * this partition - in effect it says that this does not
387 * contain an ADFS filesystem.
388 */
389 if (size < 0) {
390 size = -size;
391
392 /*
393 * Our own extension - We use the first sector
394 * of the partition to identify what type this
395 * partition is. We must not make this visible
396 * to the filesystem.
397 */
398 if (size > 1 && adfspart_check_ICSLinux(state, start)) {
399 start += 1;
400 size -= 1;
401 }
402 }
403
404 if (size)
405 put_partition(state, slot++, start, size);
406 }
407
408 put_dev_sector(sect);
409 strlcat(state->pp_buf, "\n", PAGE_SIZE);
410 return 1;
411}
412#endif
413
414#ifdef CONFIG_ACORN_PARTITION_POWERTEC
415struct ptec_part {
416 __le32 unused1;
417 __le32 unused2;
418 __le32 start;
419 __le32 size;
420 __le32 unused5;
421 char type[8];
422};
423
424static inline int valid_ptec_sector(const unsigned char *data)
425{
426 unsigned char checksum = 0x2a;
427 int i;
428
429 /*
430 * If it looks like a PC/BIOS partition, then it
431 * probably isn't PowerTec.
432 */
433 if (data[510] == 0x55 && data[511] == 0xaa)
434 return 0;
435
436 for (i = 0; i < 511; i++)
437 checksum += data[i];
438
439 return checksum == data[511];
440}
441
442/*
443 * Purpose: allocate ICS partitions.
444 * Params : hd - pointer to gendisk structure to store partition info.
445 * dev - device number to access.
446 * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
447 * Alloc : hda = whole drive
448 * hda1 = ADFS partition 0 on first drive.
449 * hda2 = ADFS partition 1 on first drive.
450 * ..etc..
451 */
452int adfspart_check_POWERTEC(struct parsed_partitions *state)
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_part_sector(state, 0, §);
461 if (!data)
462 return -1;
463
464 if (!valid_ptec_sector(data)) {
465 put_dev_sector(sect);
466 return 0;
467 }
468
469 strlcat(state->pp_buf, " [POWERTEC]", PAGE_SIZE);
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 strlcat(state->pp_buf, "\n", PAGE_SIZE);
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 adfspart_check_EESOX(struct parsed_partitions *state)
514{
515 Sector sect;
516 const unsigned char *data;
517 unsigned char buffer[256];
518 struct eesox_part *p;
519 sector_t start = 0;
520 int i, slot = 1;
521
522 data = read_part_sector(state, 7, §);
523 if (!data)
524 return -1;
525
526 /*
527 * "Decrypt" the partition table. God knows why...
528 */
529 for (i = 0; i < 256; i++)
530 buffer[i] = data[i] ^ eesox_name[i & 15];
531
532 put_dev_sector(sect);
533
534 for (i = 0, p = (struct eesox_part *)buffer; i < 8; i++, p++) {
535 sector_t next;
536
537 if (memcmp(p->magic, "Eesox", 6))
538 break;
539
540 next = le32_to_cpu(p->start);
541 if (i)
542 put_partition(state, slot++, start, next - start);
543 start = next;
544 }
545
546 if (i != 0) {
547 sector_t size;
548
549 size = get_capacity(state->bdev->bd_disk);
550 put_partition(state, slot++, start, size - start);
551 strlcat(state->pp_buf, "\n", PAGE_SIZE);
552 }
553
554 return i ? 1 : 0;
555}
556#endif
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 1996-2000 Russell King.
4 *
5 * Scan ADFS partitions on hard disk drives. Unfortunately, there
6 * isn't a standard for partitioning drives on Acorn machines, so
7 * every single manufacturer of SCSI and IDE cards created their own
8 * method.
9 */
10#include <linux/buffer_head.h>
11#include <linux/adfs_fs.h>
12
13#include "check.h"
14#include "acorn.h"
15
16/*
17 * Partition types. (Oh for reusability)
18 */
19#define PARTITION_RISCIX_MFM 1
20#define PARTITION_RISCIX_SCSI 2
21#define PARTITION_LINUX 9
22
23#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
24 defined(CONFIG_ACORN_PARTITION_ADFS)
25static struct adfs_discrecord *
26adfs_partition(struct parsed_partitions *state, char *name, char *data,
27 unsigned long first_sector, int slot)
28{
29 struct adfs_discrecord *dr;
30 unsigned int nr_sects;
31
32 if (adfs_checkbblk(data))
33 return NULL;
34
35 dr = (struct adfs_discrecord *)(data + 0x1c0);
36
37 if (dr->disc_size == 0 && dr->disc_size_high == 0)
38 return NULL;
39
40 nr_sects = (le32_to_cpu(dr->disc_size_high) << 23) |
41 (le32_to_cpu(dr->disc_size) >> 9);
42
43 if (name) {
44 strlcat(state->pp_buf, " [", PAGE_SIZE);
45 strlcat(state->pp_buf, name, PAGE_SIZE);
46 strlcat(state->pp_buf, "]", PAGE_SIZE);
47 }
48 put_partition(state, slot, first_sector, nr_sects);
49 return dr;
50}
51#endif
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
69#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
70 defined(CONFIG_ACORN_PARTITION_ADFS)
71static int riscix_partition(struct parsed_partitions *state,
72 unsigned long first_sect, int slot,
73 unsigned long nr_sects)
74{
75 Sector sect;
76 struct riscix_record *rr;
77
78 rr = read_part_sector(state, first_sect, §);
79 if (!rr)
80 return -1;
81
82 strlcat(state->pp_buf, " [RISCiX]", PAGE_SIZE);
83
84
85 if (rr->magic == RISCIX_MAGIC) {
86 unsigned long size = nr_sects > 2 ? 2 : nr_sects;
87 int part;
88
89 strlcat(state->pp_buf, " <", PAGE_SIZE);
90
91 put_partition(state, slot++, first_sect, size);
92 for (part = 0; part < 8; part++) {
93 if (rr->part[part].one &&
94 memcmp(rr->part[part].name, "All\0", 4)) {
95 put_partition(state, slot++,
96 le32_to_cpu(rr->part[part].start),
97 le32_to_cpu(rr->part[part].length));
98 strlcat(state->pp_buf, "(", PAGE_SIZE);
99 strlcat(state->pp_buf, rr->part[part].name, PAGE_SIZE);
100 strlcat(state->pp_buf, ")", PAGE_SIZE);
101 }
102 }
103
104 strlcat(state->pp_buf, " >\n", PAGE_SIZE);
105 } else {
106 put_partition(state, slot++, first_sect, nr_sects);
107 }
108
109 put_dev_sector(sect);
110 return slot;
111}
112#endif
113#endif
114
115#define LINUX_NATIVE_MAGIC 0xdeafa1de
116#define LINUX_SWAP_MAGIC 0xdeafab1e
117
118struct linux_part {
119 __le32 magic;
120 __le32 start_sect;
121 __le32 nr_sects;
122};
123
124#if defined(CONFIG_ACORN_PARTITION_CUMANA) || \
125 defined(CONFIG_ACORN_PARTITION_ADFS)
126static int linux_partition(struct parsed_partitions *state,
127 unsigned long first_sect, int slot,
128 unsigned long nr_sects)
129{
130 Sector sect;
131 struct linux_part *linuxp;
132 unsigned long size = nr_sects > 2 ? 2 : nr_sects;
133
134 strlcat(state->pp_buf, " [Linux]", PAGE_SIZE);
135
136 put_partition(state, slot++, first_sect, size);
137
138 linuxp = read_part_sector(state, first_sect, §);
139 if (!linuxp)
140 return -1;
141
142 strlcat(state->pp_buf, " <", PAGE_SIZE);
143 while (linuxp->magic == cpu_to_le32(LINUX_NATIVE_MAGIC) ||
144 linuxp->magic == cpu_to_le32(LINUX_SWAP_MAGIC)) {
145 if (slot == state->limit)
146 break;
147 put_partition(state, slot++, first_sect +
148 le32_to_cpu(linuxp->start_sect),
149 le32_to_cpu(linuxp->nr_sects));
150 linuxp ++;
151 }
152 strlcat(state->pp_buf, " >", PAGE_SIZE);
153
154 put_dev_sector(sect);
155 return slot;
156}
157#endif
158
159#ifdef CONFIG_ACORN_PARTITION_CUMANA
160int adfspart_check_CUMANA(struct parsed_partitions *state)
161{
162 unsigned long first_sector = 0;
163 unsigned int start_blk = 0;
164 Sector sect;
165 unsigned char *data;
166 char *name = "CUMANA/ADFS";
167 int first = 1;
168 int slot = 1;
169
170 /*
171 * Try Cumana style partitions - sector 6 contains ADFS boot block
172 * with pointer to next 'drive'.
173 *
174 * There are unknowns in this code - is the 'cylinder number' of the
175 * next partition relative to the start of this one - I'm assuming
176 * it is.
177 *
178 * Also, which ID did Cumana use?
179 *
180 * This is totally unfinished, and will require more work to get it
181 * going. Hence it is totally untested.
182 */
183 do {
184 struct adfs_discrecord *dr;
185 unsigned int nr_sects;
186
187 data = read_part_sector(state, start_blk * 2 + 6, §);
188 if (!data)
189 return -1;
190
191 if (slot == state->limit)
192 break;
193
194 dr = adfs_partition(state, name, data, first_sector, slot++);
195 if (!dr)
196 break;
197
198 name = NULL;
199
200 nr_sects = (data[0x1fd] + (data[0x1fe] << 8)) *
201 (dr->heads + (dr->lowsector & 0x40 ? 1 : 0)) *
202 dr->secspertrack;
203
204 if (!nr_sects)
205 break;
206
207 first = 0;
208 first_sector += nr_sects;
209 start_blk += nr_sects >> (BLOCK_SIZE_BITS - 9);
210 nr_sects = 0; /* hmm - should be partition size */
211
212 switch (data[0x1fc] & 15) {
213 case 0: /* No partition / ADFS? */
214 break;
215
216#ifdef CONFIG_ACORN_PARTITION_RISCIX
217 case PARTITION_RISCIX_SCSI:
218 /* RISCiX - we don't know how to find the next one. */
219 slot = riscix_partition(state, first_sector, slot,
220 nr_sects);
221 break;
222#endif
223
224 case PARTITION_LINUX:
225 slot = linux_partition(state, first_sector, slot,
226 nr_sects);
227 break;
228 }
229 put_dev_sector(sect);
230 if (slot == -1)
231 return -1;
232 } while (1);
233 put_dev_sector(sect);
234 return first ? 0 : 1;
235}
236#endif
237
238#ifdef CONFIG_ACORN_PARTITION_ADFS
239/*
240 * Purpose: allocate ADFS partitions.
241 *
242 * Params : hd - pointer to gendisk structure to store partition info.
243 * dev - device number to access.
244 *
245 * Returns: -1 on error, 0 for no ADFS boot sector, 1 for ok.
246 *
247 * Alloc : hda = whole drive
248 * hda1 = ADFS partition on first drive.
249 * hda2 = non-ADFS partition.
250 */
251int adfspart_check_ADFS(struct parsed_partitions *state)
252{
253 unsigned long start_sect, nr_sects, sectscyl, heads;
254 Sector sect;
255 unsigned char *data;
256 struct adfs_discrecord *dr;
257 unsigned char id;
258 int slot = 1;
259
260 data = read_part_sector(state, 6, §);
261 if (!data)
262 return -1;
263
264 dr = adfs_partition(state, "ADFS", data, 0, slot++);
265 if (!dr) {
266 put_dev_sector(sect);
267 return 0;
268 }
269
270 heads = dr->heads + ((dr->lowsector >> 6) & 1);
271 sectscyl = dr->secspertrack * heads;
272 start_sect = ((data[0x1fe] << 8) + data[0x1fd]) * sectscyl;
273 id = data[0x1fc] & 15;
274 put_dev_sector(sect);
275
276 /*
277 * Work out start of non-adfs partition.
278 */
279 nr_sects = (state->bdev->bd_inode->i_size >> 9) - start_sect;
280
281 if (start_sect) {
282 switch (id) {
283#ifdef CONFIG_ACORN_PARTITION_RISCIX
284 case PARTITION_RISCIX_SCSI:
285 case PARTITION_RISCIX_MFM:
286 slot = riscix_partition(state, start_sect, slot,
287 nr_sects);
288 break;
289#endif
290
291 case PARTITION_LINUX:
292 slot = linux_partition(state, start_sect, slot,
293 nr_sects);
294 break;
295 }
296 }
297 strlcat(state->pp_buf, "\n", PAGE_SIZE);
298 return 1;
299}
300#endif
301
302#ifdef CONFIG_ACORN_PARTITION_ICS
303
304struct ics_part {
305 __le32 start;
306 __le32 size;
307};
308
309static int adfspart_check_ICSLinux(struct parsed_partitions *state,
310 unsigned long block)
311{
312 Sector sect;
313 unsigned char *data = read_part_sector(state, block, §);
314 int result = 0;
315
316 if (data) {
317 if (memcmp(data, "LinuxPart", 9) == 0)
318 result = 1;
319 put_dev_sector(sect);
320 }
321
322 return result;
323}
324
325/*
326 * Check for a valid ICS partition using the checksum.
327 */
328static inline int valid_ics_sector(const unsigned char *data)
329{
330 unsigned long sum;
331 int i;
332
333 for (i = 0, sum = 0x50617274; i < 508; i++)
334 sum += data[i];
335
336 sum -= le32_to_cpu(*(__le32 *)(&data[508]));
337
338 return sum == 0;
339}
340
341/*
342 * Purpose: allocate ICS partitions.
343 * Params : hd - pointer to gendisk structure to store partition info.
344 * dev - device number to access.
345 * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
346 * Alloc : hda = whole drive
347 * hda1 = ADFS partition 0 on first drive.
348 * hda2 = ADFS partition 1 on first drive.
349 * ..etc..
350 */
351int adfspart_check_ICS(struct parsed_partitions *state)
352{
353 const unsigned char *data;
354 const struct ics_part *p;
355 int slot;
356 Sector sect;
357
358 /*
359 * Try ICS style partitions - sector 0 contains partition info.
360 */
361 data = read_part_sector(state, 0, §);
362 if (!data)
363 return -1;
364
365 if (!valid_ics_sector(data)) {
366 put_dev_sector(sect);
367 return 0;
368 }
369
370 strlcat(state->pp_buf, " [ICS]", PAGE_SIZE);
371
372 for (slot = 1, p = (const struct ics_part *)data; p->size; p++) {
373 u32 start = le32_to_cpu(p->start);
374 s32 size = le32_to_cpu(p->size); /* yes, it's signed. */
375
376 if (slot == state->limit)
377 break;
378
379 /*
380 * Negative sizes tell the RISC OS ICS driver to ignore
381 * this partition - in effect it says that this does not
382 * contain an ADFS filesystem.
383 */
384 if (size < 0) {
385 size = -size;
386
387 /*
388 * Our own extension - We use the first sector
389 * of the partition to identify what type this
390 * partition is. We must not make this visible
391 * to the filesystem.
392 */
393 if (size > 1 && adfspart_check_ICSLinux(state, start)) {
394 start += 1;
395 size -= 1;
396 }
397 }
398
399 if (size)
400 put_partition(state, slot++, start, size);
401 }
402
403 put_dev_sector(sect);
404 strlcat(state->pp_buf, "\n", PAGE_SIZE);
405 return 1;
406}
407#endif
408
409#ifdef CONFIG_ACORN_PARTITION_POWERTEC
410struct ptec_part {
411 __le32 unused1;
412 __le32 unused2;
413 __le32 start;
414 __le32 size;
415 __le32 unused5;
416 char type[8];
417};
418
419static inline int valid_ptec_sector(const unsigned char *data)
420{
421 unsigned char checksum = 0x2a;
422 int i;
423
424 /*
425 * If it looks like a PC/BIOS partition, then it
426 * probably isn't PowerTec.
427 */
428 if (data[510] == 0x55 && data[511] == 0xaa)
429 return 0;
430
431 for (i = 0; i < 511; i++)
432 checksum += data[i];
433
434 return checksum == data[511];
435}
436
437/*
438 * Purpose: allocate ICS partitions.
439 * Params : hd - pointer to gendisk structure to store partition info.
440 * dev - device number to access.
441 * Returns: -1 on error, 0 for no ICS table, 1 for partitions ok.
442 * Alloc : hda = whole drive
443 * hda1 = ADFS partition 0 on first drive.
444 * hda2 = ADFS partition 1 on first drive.
445 * ..etc..
446 */
447int adfspart_check_POWERTEC(struct parsed_partitions *state)
448{
449 Sector sect;
450 const unsigned char *data;
451 const struct ptec_part *p;
452 int slot = 1;
453 int i;
454
455 data = read_part_sector(state, 0, §);
456 if (!data)
457 return -1;
458
459 if (!valid_ptec_sector(data)) {
460 put_dev_sector(sect);
461 return 0;
462 }
463
464 strlcat(state->pp_buf, " [POWERTEC]", PAGE_SIZE);
465
466 for (i = 0, p = (const struct ptec_part *)data; i < 12; i++, p++) {
467 u32 start = le32_to_cpu(p->start);
468 u32 size = le32_to_cpu(p->size);
469
470 if (size)
471 put_partition(state, slot++, start, size);
472 }
473
474 put_dev_sector(sect);
475 strlcat(state->pp_buf, "\n", PAGE_SIZE);
476 return 1;
477}
478#endif
479
480#ifdef CONFIG_ACORN_PARTITION_EESOX
481struct eesox_part {
482 char magic[6];
483 char name[10];
484 __le32 start;
485 __le32 unused6;
486 __le32 unused7;
487 __le32 unused8;
488};
489
490/*
491 * Guess who created this format?
492 */
493static const char eesox_name[] = {
494 'N', 'e', 'i', 'l', ' ',
495 'C', 'r', 'i', 't', 'c', 'h', 'e', 'l', 'l', ' ', ' '
496};
497
498/*
499 * EESOX SCSI partition format.
500 *
501 * This is a goddamned awful partition format. We don't seem to store
502 * the size of the partition in this table, only the start addresses.
503 *
504 * There are two possibilities where the size comes from:
505 * 1. The individual ADFS boot block entries that are placed on the disk.
506 * 2. The start address of the next entry.
507 */
508int adfspart_check_EESOX(struct parsed_partitions *state)
509{
510 Sector sect;
511 const unsigned char *data;
512 unsigned char buffer[256];
513 struct eesox_part *p;
514 sector_t start = 0;
515 int i, slot = 1;
516
517 data = read_part_sector(state, 7, §);
518 if (!data)
519 return -1;
520
521 /*
522 * "Decrypt" the partition table. God knows why...
523 */
524 for (i = 0; i < 256; i++)
525 buffer[i] = data[i] ^ eesox_name[i & 15];
526
527 put_dev_sector(sect);
528
529 for (i = 0, p = (struct eesox_part *)buffer; i < 8; i++, p++) {
530 sector_t next;
531
532 if (memcmp(p->magic, "Eesox", 6))
533 break;
534
535 next = le32_to_cpu(p->start);
536 if (i)
537 put_partition(state, slot++, start, next - start);
538 start = next;
539 }
540
541 if (i != 0) {
542 sector_t size;
543
544 size = get_capacity(state->bdev->bd_disk);
545 put_partition(state, slot++, start, size - start);
546 strlcat(state->pp_buf, "\n", PAGE_SIZE);
547 }
548
549 return i ? 1 : 0;
550}
551#endif