fs/fat: align disk buffers on cache line to enable DMA and cache
[platform/kernel/u-boot.git] / fs / fat / fat.c
1 /*
2  * fat.c
3  *
4  * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
5  *
6  * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
7  * 2003-03-10 - kharris@nexus-tech.net - ported to uboot
8  *
9  * See file CREDITS for list of people who contributed to this
10  * project.
11  *
12  * This program is free software; you can redistribute it and/or
13  * modify it under the terms of the GNU General Public License as
14  * published by the Free Software Foundation; either version 2 of
15  * the License, or (at your option) any later version.
16  *
17  * This program is distributed in the hope that it will be useful,
18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU General Public License for more details.
21  *
22  * You should have received a copy of the GNU General Public License
23  * along with this program; if not, write to the Free Software
24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25  * MA 02111-1307 USA
26  */
27
28 #include <common.h>
29 #include <config.h>
30 #include <exports.h>
31 #include <fat.h>
32 #include <asm/byteorder.h>
33 #include <part.h>
34 #include <malloc.h>
35 #include <linux/compiler.h>
36
37 /*
38  * Convert a string to lowercase.
39  */
40 static void downcase (char *str)
41 {
42         while (*str != '\0') {
43                 TOLOWER(*str);
44                 str++;
45         }
46 }
47
48 static block_dev_desc_t *cur_dev;
49 static unsigned int cur_part_nr;
50 static disk_partition_t cur_part_info;
51
52 #define DOS_BOOT_MAGIC_OFFSET   0x1fe
53 #define DOS_FS_TYPE_OFFSET      0x36
54 #define DOS_FS32_TYPE_OFFSET    0x52
55
56 static int disk_read(__u32 block, __u32 nr_blocks, void *buf)
57 {
58         if (!cur_dev || !cur_dev->block_read)
59                 return -1;
60
61         return cur_dev->block_read(cur_dev->dev,
62                         cur_part_info.start + block, nr_blocks, buf);
63 }
64
65 int fat_register_device (block_dev_desc_t * dev_desc, int part_no)
66 {
67         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
68
69         /* First close any currently found FAT filesystem */
70         cur_dev = NULL;
71
72 #if (defined(CONFIG_CMD_IDE) || \
73      defined(CONFIG_CMD_MG_DISK) || \
74      defined(CONFIG_CMD_SATA) || \
75      defined(CONFIG_CMD_SCSI) || \
76      defined(CONFIG_CMD_USB) || \
77      defined(CONFIG_MMC) || \
78      defined(CONFIG_SYSTEMACE) )
79
80         /* Read the partition table, if present */
81         if (!get_partition_info(dev_desc, part_no, &cur_part_info)) {
82                 cur_dev = dev_desc;
83                 cur_part_nr = part_no;
84         }
85 #endif
86
87         /* Otherwise it might be a superfloppy (whole-disk FAT filesystem) */
88         if (!cur_dev) {
89                 if (part_no != 1) {
90                         printf("** Partition %d not valid on device %d **\n",
91                                         part_no, dev_desc->dev);
92                         return -1;
93                 }
94
95                 cur_dev = dev_desc;
96                 cur_part_nr = 1;
97                 cur_part_info.start = 0;
98                 cur_part_info.size = dev_desc->lba;
99                 cur_part_info.blksz = dev_desc->blksz;
100                 memset(cur_part_info.name, 0, sizeof(cur_part_info.name));
101                 memset(cur_part_info.type, 0, sizeof(cur_part_info.type));
102         }
103
104         /* Make sure it has a valid FAT header */
105         if (disk_read(0, 1, buffer) != 1) {
106                 cur_dev = NULL;
107                 return -1;
108         }
109
110         /* Check if it's actually a DOS volume */
111         if (memcmp(buffer + DOS_BOOT_MAGIC_OFFSET, "\x55\xAA", 2)) {
112                 cur_dev = NULL;
113                 return -1;
114         }
115
116         /* Check for FAT12/FAT16/FAT32 filesystem */
117         if (!memcmp(buffer + DOS_FS_TYPE_OFFSET, "FAT", 3))
118                 return 0;
119         if (!memcmp(buffer + DOS_FS32_TYPE_OFFSET, "FAT32", 5))
120                 return 0;
121
122         cur_dev = NULL;
123         return -1;
124 }
125
126
127 /*
128  * Get the first occurence of a directory delimiter ('/' or '\') in a string.
129  * Return index into string if found, -1 otherwise.
130  */
131 static int dirdelim (char *str)
132 {
133         char *start = str;
134
135         while (*str != '\0') {
136                 if (ISDIRDELIM(*str))
137                         return str - start;
138                 str++;
139         }
140         return -1;
141 }
142
143 /*
144  * Extract zero terminated short name from a directory entry.
145  */
146 static void get_name (dir_entry *dirent, char *s_name)
147 {
148         char *ptr;
149
150         memcpy(s_name, dirent->name, 8);
151         s_name[8] = '\0';
152         ptr = s_name;
153         while (*ptr && *ptr != ' ')
154                 ptr++;
155         if (dirent->ext[0] && dirent->ext[0] != ' ') {
156                 *ptr = '.';
157                 ptr++;
158                 memcpy(ptr, dirent->ext, 3);
159                 ptr[3] = '\0';
160                 while (*ptr && *ptr != ' ')
161                         ptr++;
162         }
163         *ptr = '\0';
164         if (*s_name == DELETED_FLAG)
165                 *s_name = '\0';
166         else if (*s_name == aRING)
167                 *s_name = DELETED_FLAG;
168         downcase(s_name);
169 }
170
171 /*
172  * Get the entry at index 'entry' in a FAT (12/16/32) table.
173  * On failure 0x00 is returned.
174  */
175 static __u32 get_fatent (fsdata *mydata, __u32 entry)
176 {
177         __u32 bufnum;
178         __u32 off16, offset;
179         __u32 ret = 0x00;
180         __u16 val1, val2;
181
182         switch (mydata->fatsize) {
183         case 32:
184                 bufnum = entry / FAT32BUFSIZE;
185                 offset = entry - bufnum * FAT32BUFSIZE;
186                 break;
187         case 16:
188                 bufnum = entry / FAT16BUFSIZE;
189                 offset = entry - bufnum * FAT16BUFSIZE;
190                 break;
191         case 12:
192                 bufnum = entry / FAT12BUFSIZE;
193                 offset = entry - bufnum * FAT12BUFSIZE;
194                 break;
195
196         default:
197                 /* Unsupported FAT size */
198                 return ret;
199         }
200
201         debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n",
202                mydata->fatsize, entry, entry, offset, offset);
203
204         /* Read a new block of FAT entries into the cache. */
205         if (bufnum != mydata->fatbufnum) {
206                 __u32 getsize = FATBUFBLOCKS;
207                 __u8 *bufptr = mydata->fatbuf;
208                 __u32 fatlength = mydata->fatlength;
209                 __u32 startblock = bufnum * FATBUFBLOCKS;
210
211                 if (getsize > fatlength)
212                         getsize = fatlength;
213
214                 fatlength *= mydata->sect_size; /* We want it in bytes now */
215                 startblock += mydata->fat_sect; /* Offset from start of disk */
216
217                 if (disk_read(startblock, getsize, bufptr) < 0) {
218                         debug("Error reading FAT blocks\n");
219                         return ret;
220                 }
221                 mydata->fatbufnum = bufnum;
222         }
223
224         /* Get the actual entry from the table */
225         switch (mydata->fatsize) {
226         case 32:
227                 ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]);
228                 break;
229         case 16:
230                 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]);
231                 break;
232         case 12:
233                 off16 = (offset * 3) / 4;
234
235                 switch (offset & 0x3) {
236                 case 0:
237                         ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[off16]);
238                         ret &= 0xfff;
239                         break;
240                 case 1:
241                         val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
242                         val1 &= 0xf000;
243                         val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
244                         val2 &= 0x00ff;
245                         ret = (val2 << 4) | (val1 >> 12);
246                         break;
247                 case 2:
248                         val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
249                         val1 &= 0xff00;
250                         val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
251                         val2 &= 0x000f;
252                         ret = (val2 << 8) | (val1 >> 8);
253                         break;
254                 case 3:
255                         ret = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
256                         ret = (ret & 0xfff0) >> 4;
257                         break;
258                 default:
259                         break;
260                 }
261                 break;
262         }
263         debug("FAT%d: ret: %08x, offset: %04x\n",
264                mydata->fatsize, ret, offset);
265
266         return ret;
267 }
268
269 /*
270  * Read at most 'size' bytes from the specified cluster into 'buffer'.
271  * Return 0 on success, -1 otherwise.
272  */
273 static int
274 get_cluster (fsdata *mydata, __u32 clustnum, __u8 *buffer,
275              unsigned long size)
276 {
277         __u32 idx = 0;
278         __u32 startsect;
279         __u32 nr_sect;
280         int ret;
281
282         if (clustnum > 0) {
283                 startsect = mydata->data_begin +
284                                 clustnum * mydata->clust_size;
285         } else {
286                 startsect = mydata->rootdir_sect;
287         }
288
289         debug("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
290
291         nr_sect = size / mydata->sect_size;
292         ret = disk_read(startsect, nr_sect, buffer);
293         if (ret != nr_sect) {
294                 debug("Error reading data (got %d)\n", ret);
295                 return -1;
296         }
297         if (size % mydata->sect_size) {
298                 ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
299
300                 idx = size / mydata->sect_size;
301                 ret = disk_read(startsect + idx, 1, tmpbuf);
302                 if (ret != 1) {
303                         debug("Error reading data (got %d)\n", ret);
304                         return -1;
305                 }
306                 buffer += idx * mydata->sect_size;
307
308                 memcpy(buffer, tmpbuf, size % mydata->sect_size);
309                 return 0;
310         }
311
312         return 0;
313 }
314
315 /*
316  * Read at most 'maxsize' bytes from the file associated with 'dentptr'
317  * into 'buffer'.
318  * Return the number of bytes read or -1 on fatal errors.
319  */
320 static long
321 get_contents (fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
322               unsigned long maxsize)
323 {
324         unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
325         unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
326         __u32 curclust = START(dentptr);
327         __u32 endclust, newclust;
328         unsigned long actsize;
329
330         debug("Filesize: %ld bytes\n", filesize);
331
332         if (maxsize > 0 && filesize > maxsize)
333                 filesize = maxsize;
334
335         debug("%ld bytes\n", filesize);
336
337         actsize = bytesperclust;
338         endclust = curclust;
339
340         do {
341                 /* search for consecutive clusters */
342                 while (actsize < filesize) {
343                         newclust = get_fatent(mydata, endclust);
344                         if ((newclust - 1) != endclust)
345                                 goto getit;
346                         if (CHECK_CLUST(newclust, mydata->fatsize)) {
347                                 debug("curclust: 0x%x\n", newclust);
348                                 debug("Invalid FAT entry\n");
349                                 return gotsize;
350                         }
351                         endclust = newclust;
352                         actsize += bytesperclust;
353                 }
354
355                 /* actsize >= file size */
356                 actsize -= bytesperclust;
357
358                 /* get remaining clusters */
359                 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
360                         printf("Error reading cluster\n");
361                         return -1;
362                 }
363
364                 /* get remaining bytes */
365                 gotsize += (int)actsize;
366                 filesize -= actsize;
367                 buffer += actsize;
368                 actsize = filesize;
369                 if (get_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
370                         printf("Error reading cluster\n");
371                         return -1;
372                 }
373                 gotsize += actsize;
374                 return gotsize;
375 getit:
376                 if (get_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
377                         printf("Error reading cluster\n");
378                         return -1;
379                 }
380                 gotsize += (int)actsize;
381                 filesize -= actsize;
382                 buffer += actsize;
383
384                 curclust = get_fatent(mydata, endclust);
385                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
386                         debug("curclust: 0x%x\n", curclust);
387                         printf("Invalid FAT entry\n");
388                         return gotsize;
389                 }
390                 actsize = bytesperclust;
391                 endclust = curclust;
392         } while (1);
393 }
394
395 #ifdef CONFIG_SUPPORT_VFAT
396 /*
397  * Extract the file name information from 'slotptr' into 'l_name',
398  * starting at l_name[*idx].
399  * Return 1 if terminator (zero byte) is found, 0 otherwise.
400  */
401 static int slot2str (dir_slot *slotptr, char *l_name, int *idx)
402 {
403         int j;
404
405         for (j = 0; j <= 8; j += 2) {
406                 l_name[*idx] = slotptr->name0_4[j];
407                 if (l_name[*idx] == 0x00)
408                         return 1;
409                 (*idx)++;
410         }
411         for (j = 0; j <= 10; j += 2) {
412                 l_name[*idx] = slotptr->name5_10[j];
413                 if (l_name[*idx] == 0x00)
414                         return 1;
415                 (*idx)++;
416         }
417         for (j = 0; j <= 2; j += 2) {
418                 l_name[*idx] = slotptr->name11_12[j];
419                 if (l_name[*idx] == 0x00)
420                         return 1;
421                 (*idx)++;
422         }
423
424         return 0;
425 }
426
427 /*
428  * Extract the full long filename starting at 'retdent' (which is really
429  * a slot) into 'l_name'. If successful also copy the real directory entry
430  * into 'retdent'
431  * Return 0 on success, -1 otherwise.
432  */
433 __u8 get_vfatname_block[MAX_CLUSTSIZE]
434         __aligned(ARCH_DMA_MINALIGN);
435
436 static int
437 get_vfatname (fsdata *mydata, int curclust, __u8 *cluster,
438               dir_entry *retdent, char *l_name)
439 {
440         dir_entry *realdent;
441         dir_slot *slotptr = (dir_slot *)retdent;
442         __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ?
443                                                         PREFETCH_BLOCKS :
444                                                         mydata->clust_size);
445         __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
446         int idx = 0;
447
448         if (counter > VFAT_MAXSEQ) {
449                 debug("Error: VFAT name is too long\n");
450                 return -1;
451         }
452
453         while ((__u8 *)slotptr < buflimit) {
454                 if (counter == 0)
455                         break;
456                 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
457                         return -1;
458                 slotptr++;
459                 counter--;
460         }
461
462         if ((__u8 *)slotptr >= buflimit) {
463                 dir_slot *slotptr2;
464
465                 if (curclust == 0)
466                         return -1;
467                 curclust = get_fatent(mydata, curclust);
468                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
469                         debug("curclust: 0x%x\n", curclust);
470                         printf("Invalid FAT entry\n");
471                         return -1;
472                 }
473
474                 if (get_cluster(mydata, curclust, get_vfatname_block,
475                                 mydata->clust_size * mydata->sect_size) != 0) {
476                         debug("Error: reading directory block\n");
477                         return -1;
478                 }
479
480                 slotptr2 = (dir_slot *)get_vfatname_block;
481                 while (counter > 0) {
482                         if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK)
483                             & 0xff) != counter)
484                                 return -1;
485                         slotptr2++;
486                         counter--;
487                 }
488
489                 /* Save the real directory entry */
490                 realdent = (dir_entry *)slotptr2;
491                 while ((__u8 *)slotptr2 > get_vfatname_block) {
492                         slotptr2--;
493                         slot2str(slotptr2, l_name, &idx);
494                 }
495         } else {
496                 /* Save the real directory entry */
497                 realdent = (dir_entry *)slotptr;
498         }
499
500         do {
501                 slotptr--;
502                 if (slot2str(slotptr, l_name, &idx))
503                         break;
504         } while (!(slotptr->id & LAST_LONG_ENTRY_MASK));
505
506         l_name[idx] = '\0';
507         if (*l_name == DELETED_FLAG)
508                 *l_name = '\0';
509         else if (*l_name == aRING)
510                 *l_name = DELETED_FLAG;
511         downcase(l_name);
512
513         /* Return the real directory entry */
514         memcpy(retdent, realdent, sizeof(dir_entry));
515
516         return 0;
517 }
518
519 /* Calculate short name checksum */
520 static __u8 mkcksum (const char *str)
521 {
522         int i;
523
524         __u8 ret = 0;
525
526         for (i = 0; i < 11; i++) {
527                 ret = (((ret & 1) << 7) | ((ret & 0xfe) >> 1)) + str[i];
528         }
529
530         return ret;
531 }
532 #endif  /* CONFIG_SUPPORT_VFAT */
533
534 /*
535  * Get the directory entry associated with 'filename' from the directory
536  * starting at 'startsect'
537  */
538 __u8 get_dentfromdir_block[MAX_CLUSTSIZE]
539         __aligned(ARCH_DMA_MINALIGN);
540
541 static dir_entry *get_dentfromdir (fsdata *mydata, int startsect,
542                                    char *filename, dir_entry *retdent,
543                                    int dols)
544 {
545         __u16 prevcksum = 0xffff;
546         __u32 curclust = START(retdent);
547         int files = 0, dirs = 0;
548
549         debug("get_dentfromdir: %s\n", filename);
550
551         while (1) {
552                 dir_entry *dentptr;
553
554                 int i;
555
556                 if (get_cluster(mydata, curclust, get_dentfromdir_block,
557                                 mydata->clust_size * mydata->sect_size) != 0) {
558                         debug("Error: reading directory block\n");
559                         return NULL;
560                 }
561
562                 dentptr = (dir_entry *)get_dentfromdir_block;
563
564                 for (i = 0; i < DIRENTSPERCLUST; i++) {
565                         char s_name[14], l_name[VFAT_MAXLEN_BYTES];
566
567                         l_name[0] = '\0';
568                         if (dentptr->name[0] == DELETED_FLAG) {
569                                 dentptr++;
570                                 continue;
571                         }
572                         if ((dentptr->attr & ATTR_VOLUME)) {
573 #ifdef CONFIG_SUPPORT_VFAT
574                                 if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT &&
575                                     (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
576                                         prevcksum = ((dir_slot *)dentptr)->alias_checksum;
577                                         get_vfatname(mydata, curclust,
578                                                      get_dentfromdir_block,
579                                                      dentptr, l_name);
580                                         if (dols) {
581                                                 int isdir;
582                                                 char dirc;
583                                                 int doit = 0;
584
585                                                 isdir = (dentptr->attr & ATTR_DIR);
586
587                                                 if (isdir) {
588                                                         dirs++;
589                                                         dirc = '/';
590                                                         doit = 1;
591                                                 } else {
592                                                         dirc = ' ';
593                                                         if (l_name[0] != 0) {
594                                                                 files++;
595                                                                 doit = 1;
596                                                         }
597                                                 }
598                                                 if (doit) {
599                                                         if (dirc == ' ') {
600                                                                 printf(" %8ld   %s%c\n",
601                                                                         (long)FAT2CPU32(dentptr->size),
602                                                                         l_name,
603                                                                         dirc);
604                                                         } else {
605                                                                 printf("            %s%c\n",
606                                                                         l_name,
607                                                                         dirc);
608                                                         }
609                                                 }
610                                                 dentptr++;
611                                                 continue;
612                                         }
613                                         debug("vfatname: |%s|\n", l_name);
614                                 } else
615 #endif
616                                 {
617                                         /* Volume label or VFAT entry */
618                                         dentptr++;
619                                         continue;
620                                 }
621                         }
622                         if (dentptr->name[0] == 0) {
623                                 if (dols) {
624                                         printf("\n%d file(s), %d dir(s)\n\n",
625                                                 files, dirs);
626                                 }
627                                 debug("Dentname == NULL - %d\n", i);
628                                 return NULL;
629                         }
630 #ifdef CONFIG_SUPPORT_VFAT
631                         if (dols && mkcksum(dentptr->name) == prevcksum) {
632                                 prevcksum = 0xffff;
633                                 dentptr++;
634                                 continue;
635                         }
636 #endif
637                         get_name(dentptr, s_name);
638                         if (dols) {
639                                 int isdir = (dentptr->attr & ATTR_DIR);
640                                 char dirc;
641                                 int doit = 0;
642
643                                 if (isdir) {
644                                         dirs++;
645                                         dirc = '/';
646                                         doit = 1;
647                                 } else {
648                                         dirc = ' ';
649                                         if (s_name[0] != 0) {
650                                                 files++;
651                                                 doit = 1;
652                                         }
653                                 }
654
655                                 if (doit) {
656                                         if (dirc == ' ') {
657                                                 printf(" %8ld   %s%c\n",
658                                                         (long)FAT2CPU32(dentptr->size),
659                                                         s_name, dirc);
660                                         } else {
661                                                 printf("            %s%c\n",
662                                                         s_name, dirc);
663                                         }
664                                 }
665
666                                 dentptr++;
667                                 continue;
668                         }
669
670                         if (strcmp(filename, s_name)
671                             && strcmp(filename, l_name)) {
672                                 debug("Mismatch: |%s|%s|\n", s_name, l_name);
673                                 dentptr++;
674                                 continue;
675                         }
676
677                         memcpy(retdent, dentptr, sizeof(dir_entry));
678
679                         debug("DentName: %s", s_name);
680                         debug(", start: 0x%x", START(dentptr));
681                         debug(", size:  0x%x %s\n",
682                               FAT2CPU32(dentptr->size),
683                               (dentptr->attr & ATTR_DIR) ? "(DIR)" : "");
684
685                         return retdent;
686                 }
687
688                 curclust = get_fatent(mydata, curclust);
689                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
690                         debug("curclust: 0x%x\n", curclust);
691                         printf("Invalid FAT entry\n");
692                         return NULL;
693                 }
694         }
695
696         return NULL;
697 }
698
699 /*
700  * Read boot sector and volume info from a FAT filesystem
701  */
702 static int
703 read_bootsectandvi (boot_sector *bs, volume_info *volinfo, int *fatsize)
704 {
705         __u8 *block;
706         volume_info *vistart;
707         int ret = 0;
708
709         if (cur_dev == NULL) {
710                 debug("Error: no device selected\n");
711                 return -1;
712         }
713
714         block = memalign(ARCH_DMA_MINALIGN, cur_dev->blksz);
715         if (block == NULL) {
716                 debug("Error: allocating block\n");
717                 return -1;
718         }
719
720         if (disk_read (0, 1, block) < 0) {
721                 debug("Error: reading block\n");
722                 goto fail;
723         }
724
725         memcpy(bs, block, sizeof(boot_sector));
726         bs->reserved = FAT2CPU16(bs->reserved);
727         bs->fat_length = FAT2CPU16(bs->fat_length);
728         bs->secs_track = FAT2CPU16(bs->secs_track);
729         bs->heads = FAT2CPU16(bs->heads);
730         bs->total_sect = FAT2CPU32(bs->total_sect);
731
732         /* FAT32 entries */
733         if (bs->fat_length == 0) {
734                 /* Assume FAT32 */
735                 bs->fat32_length = FAT2CPU32(bs->fat32_length);
736                 bs->flags = FAT2CPU16(bs->flags);
737                 bs->root_cluster = FAT2CPU32(bs->root_cluster);
738                 bs->info_sector = FAT2CPU16(bs->info_sector);
739                 bs->backup_boot = FAT2CPU16(bs->backup_boot);
740                 vistart = (volume_info *)(block + sizeof(boot_sector));
741                 *fatsize = 32;
742         } else {
743                 vistart = (volume_info *)&(bs->fat32_length);
744                 *fatsize = 0;
745         }
746         memcpy(volinfo, vistart, sizeof(volume_info));
747
748         if (*fatsize == 32) {
749                 if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0)
750                         goto exit;
751         } else {
752                 if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) {
753                         *fatsize = 12;
754                         goto exit;
755                 }
756                 if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) {
757                         *fatsize = 16;
758                         goto exit;
759                 }
760         }
761
762         debug("Error: broken fs_type sign\n");
763 fail:
764         ret = -1;
765 exit:
766         free(block);
767         return ret;
768 }
769
770 __u8 do_fat_read_block[MAX_CLUSTSIZE]
771         __aligned(ARCH_DMA_MINALIGN);
772
773 long
774 do_fat_read (const char *filename, void *buffer, unsigned long maxsize,
775              int dols)
776 {
777         char fnamecopy[2048];
778         boot_sector bs;
779         volume_info volinfo;
780         fsdata datablock;
781         fsdata *mydata = &datablock;
782         dir_entry *dentptr;
783         __u16 prevcksum = 0xffff;
784         char *subname = "";
785         __u32 cursect;
786         int idx, isdir = 0;
787         int files = 0, dirs = 0;
788         long ret = -1;
789         int firsttime;
790         __u32 root_cluster = 0;
791         int rootdir_size = 0;
792         int j;
793
794         if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) {
795                 debug("Error: reading boot sector\n");
796                 return -1;
797         }
798
799         if (mydata->fatsize == 32) {
800                 root_cluster = bs.root_cluster;
801                 mydata->fatlength = bs.fat32_length;
802         } else {
803                 mydata->fatlength = bs.fat_length;
804         }
805
806         mydata->fat_sect = bs.reserved;
807
808         cursect = mydata->rootdir_sect
809                 = mydata->fat_sect + mydata->fatlength * bs.fats;
810
811         mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0];
812         mydata->clust_size = bs.cluster_size;
813         if (mydata->sect_size != cur_part_info.blksz) {
814                 printf("Error: FAT sector size mismatch (fs=%hu, dev=%lu)\n",
815                                 mydata->sect_size, cur_part_info.blksz);
816                 return -1;
817         }
818
819         if (mydata->fatsize == 32) {
820                 mydata->data_begin = mydata->rootdir_sect -
821                                         (mydata->clust_size * 2);
822         } else {
823                 rootdir_size = ((bs.dir_entries[1]  * (int)256 +
824                                  bs.dir_entries[0]) *
825                                  sizeof(dir_entry)) /
826                                  mydata->sect_size;
827                 mydata->data_begin = mydata->rootdir_sect +
828                                         rootdir_size -
829                                         (mydata->clust_size * 2);
830         }
831
832         mydata->fatbufnum = -1;
833         mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE);
834         if (mydata->fatbuf == NULL) {
835                 debug("Error: allocating memory\n");
836                 return -1;
837         }
838
839 #ifdef CONFIG_SUPPORT_VFAT
840         debug("VFAT Support enabled\n");
841 #endif
842         debug("FAT%d, fat_sect: %d, fatlength: %d\n",
843                mydata->fatsize, mydata->fat_sect, mydata->fatlength);
844         debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n"
845                "Data begins at: %d\n",
846                root_cluster,
847                mydata->rootdir_sect,
848                mydata->rootdir_sect * mydata->sect_size, mydata->data_begin);
849         debug("Sector size: %d, cluster size: %d\n", mydata->sect_size,
850               mydata->clust_size);
851
852         /* "cwd" is always the root... */
853         while (ISDIRDELIM(*filename))
854                 filename++;
855
856         /* Make a copy of the filename and convert it to lowercase */
857         strcpy(fnamecopy, filename);
858         downcase(fnamecopy);
859
860         if (*fnamecopy == '\0') {
861                 if (!dols)
862                         goto exit;
863
864                 dols = LS_ROOT;
865         } else if ((idx = dirdelim(fnamecopy)) >= 0) {
866                 isdir = 1;
867                 fnamecopy[idx] = '\0';
868                 subname = fnamecopy + idx + 1;
869
870                 /* Handle multiple delimiters */
871                 while (ISDIRDELIM(*subname))
872                         subname++;
873         } else if (dols) {
874                 isdir = 1;
875         }
876
877         j = 0;
878         while (1) {
879                 int i;
880
881                 debug("FAT read sect=%d, clust_size=%d, DIRENTSPERBLOCK=%zd\n",
882                         cursect, mydata->clust_size, DIRENTSPERBLOCK);
883
884                 if (disk_read(cursect,
885                                 (mydata->fatsize == 32) ?
886                                 (mydata->clust_size) :
887                                 PREFETCH_BLOCKS,
888                                 do_fat_read_block) < 0) {
889                         debug("Error: reading rootdir block\n");
890                         goto exit;
891                 }
892
893                 dentptr = (dir_entry *) do_fat_read_block;
894
895                 for (i = 0; i < DIRENTSPERBLOCK; i++) {
896                         char s_name[14], l_name[VFAT_MAXLEN_BYTES];
897
898                         l_name[0] = '\0';
899                         if (dentptr->name[0] == DELETED_FLAG) {
900                                 dentptr++;
901                                 continue;
902                         }
903                         if ((dentptr->attr & ATTR_VOLUME)) {
904 #ifdef CONFIG_SUPPORT_VFAT
905                                 if ((dentptr->attr & ATTR_VFAT) == ATTR_VFAT &&
906                                     (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
907                                         prevcksum =
908                                                 ((dir_slot *)dentptr)->alias_checksum;
909
910                                         get_vfatname(mydata,
911                                                      root_cluster,
912                                                      do_fat_read_block,
913                                                      dentptr, l_name);
914
915                                         if (dols == LS_ROOT) {
916                                                 char dirc;
917                                                 int doit = 0;
918                                                 int isdir =
919                                                         (dentptr->attr & ATTR_DIR);
920
921                                                 if (isdir) {
922                                                         dirs++;
923                                                         dirc = '/';
924                                                         doit = 1;
925                                                 } else {
926                                                         dirc = ' ';
927                                                         if (l_name[0] != 0) {
928                                                                 files++;
929                                                                 doit = 1;
930                                                         }
931                                                 }
932                                                 if (doit) {
933                                                         if (dirc == ' ') {
934                                                                 printf(" %8ld   %s%c\n",
935                                                                         (long)FAT2CPU32(dentptr->size),
936                                                                         l_name,
937                                                                         dirc);
938                                                         } else {
939                                                                 printf("            %s%c\n",
940                                                                         l_name,
941                                                                         dirc);
942                                                         }
943                                                 }
944                                                 dentptr++;
945                                                 continue;
946                                         }
947                                         debug("Rootvfatname: |%s|\n",
948                                                l_name);
949                                 } else
950 #endif
951                                 {
952                                         /* Volume label or VFAT entry */
953                                         dentptr++;
954                                         continue;
955                                 }
956                         } else if (dentptr->name[0] == 0) {
957                                 debug("RootDentname == NULL - %d\n", i);
958                                 if (dols == LS_ROOT) {
959                                         printf("\n%d file(s), %d dir(s)\n\n",
960                                                 files, dirs);
961                                         ret = 0;
962                                 }
963                                 goto exit;
964                         }
965 #ifdef CONFIG_SUPPORT_VFAT
966                         else if (dols == LS_ROOT &&
967                                  mkcksum(dentptr->name) == prevcksum) {
968                                 prevcksum = 0xffff;
969                                 dentptr++;
970                                 continue;
971                         }
972 #endif
973                         get_name(dentptr, s_name);
974
975                         if (dols == LS_ROOT) {
976                                 int isdir = (dentptr->attr & ATTR_DIR);
977                                 char dirc;
978                                 int doit = 0;
979
980                                 if (isdir) {
981                                         dirc = '/';
982                                         if (s_name[0] != 0) {
983                                                 dirs++;
984                                                 doit = 1;
985                                         }
986                                 } else {
987                                         dirc = ' ';
988                                         if (s_name[0] != 0) {
989                                                 files++;
990                                                 doit = 1;
991                                         }
992                                 }
993                                 if (doit) {
994                                         if (dirc == ' ') {
995                                                 printf(" %8ld   %s%c\n",
996                                                         (long)FAT2CPU32(dentptr->size),
997                                                         s_name, dirc);
998                                         } else {
999                                                 printf("            %s%c\n",
1000                                                         s_name, dirc);
1001                                         }
1002                                 }
1003                                 dentptr++;
1004                                 continue;
1005                         }
1006
1007                         if (strcmp(fnamecopy, s_name)
1008                             && strcmp(fnamecopy, l_name)) {
1009                                 debug("RootMismatch: |%s|%s|\n", s_name,
1010                                        l_name);
1011                                 dentptr++;
1012                                 continue;
1013                         }
1014
1015                         if (isdir && !(dentptr->attr & ATTR_DIR))
1016                                 goto exit;
1017
1018                         debug("RootName: %s", s_name);
1019                         debug(", start: 0x%x", START(dentptr));
1020                         debug(", size:  0x%x %s\n",
1021                                FAT2CPU32(dentptr->size),
1022                                isdir ? "(DIR)" : "");
1023
1024                         goto rootdir_done;      /* We got a match */
1025                 }
1026                 debug("END LOOP: j=%d   clust_size=%d\n", j,
1027                        mydata->clust_size);
1028
1029                 /*
1030                  * On FAT32 we must fetch the FAT entries for the next
1031                  * root directory clusters when a cluster has been
1032                  * completely processed.
1033                  */
1034                 ++j;
1035                 int fat32_end = 0;
1036                 if ((mydata->fatsize == 32) && (j == mydata->clust_size)) {
1037                         int nxtsect = 0;
1038                         int nxt_clust = 0;
1039
1040                         nxt_clust = get_fatent(mydata, root_cluster);
1041                         fat32_end = CHECK_CLUST(nxt_clust, 32);
1042
1043                         nxtsect = mydata->data_begin +
1044                                 (nxt_clust * mydata->clust_size);
1045
1046                         root_cluster = nxt_clust;
1047
1048                         cursect = nxtsect;
1049                         j = 0;
1050                 } else {
1051                         cursect++;
1052                 }
1053
1054                 /* If end of rootdir reached */
1055                 if ((mydata->fatsize == 32 && fat32_end) ||
1056                     (mydata->fatsize != 32 && j == rootdir_size)) {
1057                         if (dols == LS_ROOT) {
1058                                 printf("\n%d file(s), %d dir(s)\n\n",
1059                                        files, dirs);
1060                                 ret = 0;
1061                         }
1062                         goto exit;
1063                 }
1064         }
1065 rootdir_done:
1066
1067         firsttime = 1;
1068
1069         while (isdir) {
1070                 int startsect = mydata->data_begin
1071                         + START(dentptr) * mydata->clust_size;
1072                 dir_entry dent;
1073                 char *nextname = NULL;
1074
1075                 dent = *dentptr;
1076                 dentptr = &dent;
1077
1078                 idx = dirdelim(subname);
1079
1080                 if (idx >= 0) {
1081                         subname[idx] = '\0';
1082                         nextname = subname + idx + 1;
1083                         /* Handle multiple delimiters */
1084                         while (ISDIRDELIM(*nextname))
1085                                 nextname++;
1086                         if (dols && *nextname == '\0')
1087                                 firsttime = 0;
1088                 } else {
1089                         if (dols && firsttime) {
1090                                 firsttime = 0;
1091                         } else {
1092                                 isdir = 0;
1093                         }
1094                 }
1095
1096                 if (get_dentfromdir(mydata, startsect, subname, dentptr,
1097                                      isdir ? 0 : dols) == NULL) {
1098                         if (dols && !isdir)
1099                                 ret = 0;
1100                         goto exit;
1101                 }
1102
1103                 if (idx >= 0) {
1104                         if (!(dentptr->attr & ATTR_DIR))
1105                                 goto exit;
1106                         subname = nextname;
1107                 }
1108         }
1109
1110         ret = get_contents(mydata, dentptr, buffer, maxsize);
1111         debug("Size: %d, got: %ld\n", FAT2CPU32(dentptr->size), ret);
1112
1113 exit:
1114         free(mydata->fatbuf);
1115         return ret;
1116 }
1117
1118 int file_fat_detectfs (void)
1119 {
1120         boot_sector bs;
1121         volume_info volinfo;
1122         int fatsize;
1123         char vol_label[12];
1124
1125         if (cur_dev == NULL) {
1126                 printf("No current device\n");
1127                 return 1;
1128         }
1129
1130 #if defined(CONFIG_CMD_IDE) || \
1131     defined(CONFIG_CMD_MG_DISK) || \
1132     defined(CONFIG_CMD_SATA) || \
1133     defined(CONFIG_CMD_SCSI) || \
1134     defined(CONFIG_CMD_USB) || \
1135     defined(CONFIG_MMC)
1136         printf("Interface:  ");
1137         switch (cur_dev->if_type) {
1138         case IF_TYPE_IDE:
1139                 printf("IDE");
1140                 break;
1141         case IF_TYPE_SATA:
1142                 printf("SATA");
1143                 break;
1144         case IF_TYPE_SCSI:
1145                 printf("SCSI");
1146                 break;
1147         case IF_TYPE_ATAPI:
1148                 printf("ATAPI");
1149                 break;
1150         case IF_TYPE_USB:
1151                 printf("USB");
1152                 break;
1153         case IF_TYPE_DOC:
1154                 printf("DOC");
1155                 break;
1156         case IF_TYPE_MMC:
1157                 printf("MMC");
1158                 break;
1159         default:
1160                 printf("Unknown");
1161         }
1162
1163         printf("\n  Device %d: ", cur_dev->dev);
1164         dev_print(cur_dev);
1165 #endif
1166
1167         if (read_bootsectandvi(&bs, &volinfo, &fatsize)) {
1168                 printf("\nNo valid FAT fs found\n");
1169                 return 1;
1170         }
1171
1172         memcpy(vol_label, volinfo.volume_label, 11);
1173         vol_label[11] = '\0';
1174         volinfo.fs_type[5] = '\0';
1175
1176         printf("Partition %d: Filesystem: %s \"%s\"\n", cur_part_nr,
1177                 volinfo.fs_type, vol_label);
1178
1179         return 0;
1180 }
1181
1182 int file_fat_ls (const char *dir)
1183 {
1184         return do_fat_read(dir, NULL, 0, LS_YES);
1185 }
1186
1187 long file_fat_read (const char *filename, void *buffer, unsigned long maxsize)
1188 {
1189         printf("reading %s\n", filename);
1190         return do_fat_read(filename, buffer, maxsize, LS_NO);
1191 }