~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/partitions/acorn.c

Version: ~ [ linux-5.3-rc5 ] ~ [ linux-5.2.9 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.67 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.139 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.189 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.189 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.72 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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)
 30 static struct adfs_discrecord *
 31 adfs_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 
 60 struct riscix_part {
 61         __le32  start;
 62         __le32  length;
 63         __le32  one;
 64         char    name[16];
 65 };
 66 
 67 struct 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)
 76 static 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, &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 
123 struct 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)
131 static 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, &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
165 int 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, &sect);
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  */
256 int 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, &sect);
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 
309 struct ics_part {
310         __le32 start;
311         __le32 size;
312 };
313 
314 static 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, &sect);
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  */
333 static 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  */
356 int 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, &sect);
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
415 struct ptec_part {
416         __le32 unused1;
417         __le32 unused2;
418         __le32 start;
419         __le32 size;
420         __le32 unused5;
421         char type[8];
422 };
423 
424 static 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  */
452 int 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, &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         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
486 struct 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  */
498 static 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  */
513 int 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, &sect);
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
557 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp