disk/part_dos.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001
   4  * Raymond Lo, lo@routefree.com
   5  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   6  */
   7
   8 /*
   9  * Support for harddisk partitions.
  10  *
  11  * To be compatible with LinuxPPC and Apple we use the standard Apple
  12  * SCSI disk partitioning scheme. For more information see:
  13  * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
  14  */
  15
  16 #include <common.h>
  17 #include <command.h>
  18 #include <ide.h>
  19 #include <memalign.h>
  20 #include "part_dos.h"
  21
  22 #ifdef CONFIG_HAVE_BLOCK_DEVICE
  23
  24 #define DOS_PART_DEFAULT_SECTOR 512
  25
  26 /* should this be configurable? It looks like it's not very common at all
  27  * to use large numbers of partitions */
  28 #define MAX_EXT_PARTS 256
  29
  30 /* Convert char[4] in little endian format to the host format integer
  31  */
  32 static inline unsigned int le32_to_int(unsigned char *le32)
  33 {
  34     return ((le32[3] << 24) +
  35             (le32[2] << 16) +
  36             (le32[1] << 8) +
  37              le32[0]
  38            );
  39 }
  40
  41 static inline int is_extended(int part_type)
  42 {
  43     return (part_type == 0x5 ||
  44             part_type == 0xf ||
  45             part_type == 0x85);
  46 }
  47
  48 static inline int is_bootable(dos_partition_t *p)
  49 {
  50         return (p->sys_ind == 0xef) || (p->boot_ind == 0x80);
  51 }
  52
  53 static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
  54                            int part_num, unsigned int disksig)
  55 {
  56         lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4);
  57         lbaint_t lba_size  = le32_to_int (p->size4);
  58
  59         printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
  60                 "u\t%08x-%02x\t%02x%s%s\n",
  61                 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
  62                 (is_extended(p->sys_ind) ? " Extd" : ""),
  63                 (is_bootable(p) ? " Boot" : ""));
  64 }
  65
  66 static int test_block_type(unsigned char *buffer)
  67 {
  68         int slot;
  69         struct dos_partition *p;
  70
  71         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  72             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  73                 return (-1);
  74         } /* no DOS Signature at all */
  75         p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
  76         for (slot = 0; slot < 3; slot++) {
  77                 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
  78                         if (!slot &&
  79                             (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
  80                                      "FAT", 3) == 0 ||
  81                              strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
  82                                      "FAT32", 5) == 0)) {
  83                                 return DOS_PBR; /* is PBR */
  84                         } else {
  85                                 return -1;
  86                         }
  87                 }
  88         }
  89         return DOS_MBR;     /* Is MBR */
  90 }
  91
  92
  93 static int part_test_dos(struct blk_desc *dev_desc)
  94 {
  95 #ifndef CONFIG_SPL_BUILD
  96         ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, 1);
  97
  98         if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
  99                 return -1;
 100
 101         if (test_block_type((unsigned char *)mbr) != DOS_MBR)
 102                 return -1;
 103
 104         if (dev_desc->sig_type == SIG_TYPE_NONE &&
 105             mbr->unique_mbr_signature != 0) {
 106                 dev_desc->sig_type = SIG_TYPE_MBR;
 107                 dev_desc->mbr_sig = mbr->unique_mbr_signature;
 108         }
 109 #else
 110         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 111
 112         if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
 113                 return -1;
 114
 115         if (test_block_type(buffer) != DOS_MBR)
 116                 return -1;
 117 #endif
 118
 119         return 0;
 120 }
 121
 122 /*  Print a partition that is relative to its Extended partition table
 123  */
 124 static void print_partition_extended(struct blk_desc *dev_desc,
 125                                      lbaint_t ext_part_sector,
 126                                      lbaint_t relative,
 127                                      int part_num, unsigned int disksig)
 128 {
 129         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 130         dos_partition_t *pt;
 131         int i;
 132
 133         /* set a maximum recursion level */
 134         if (part_num > MAX_EXT_PARTS)
 135         {
 136                 printf("** Nested DOS partitions detected, stopping **\n");
 137                 return;
 138     }
 139
 140         if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
 141                 printf ("** Can't read partition table on %d:" LBAFU " **\n",
 142                         dev_desc->devnum, ext_part_sector);
 143                 return;
 144         }
 145         i=test_block_type(buffer);
 146         if (i != DOS_MBR) {
 147                 printf ("bad MBR sector signature 0x%02x%02x\n",
 148                         buffer[DOS_PART_MAGIC_OFFSET],
 149                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 150                 return;
 151         }
 152
 153         if (!ext_part_sector)
 154                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 155
 156         /* Print all primary/logical partitions */
 157         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 158         for (i = 0; i < 4; i++, pt++) {
 159                 /*
 160                  * fdisk does not show the extended partitions that
 161                  * are not in the MBR
 162                  */
 163
 164                 if ((pt->sys_ind != 0) &&
 165                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 166                         print_one_part(pt, ext_part_sector, part_num, disksig);
 167                 }
 168
 169                 /* Reverse engr the fdisk part# assignment rule! */
 170                 if ((ext_part_sector == 0) ||
 171                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 172                         part_num++;
 173                 }
 174         }
 175
 176         /* Follows the extended partitions */
 177         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 178         for (i = 0; i < 4; i++, pt++) {
 179                 if (is_extended (pt->sys_ind)) {
 180                         lbaint_t lba_start
 181                                 = le32_to_int (pt->start4) + relative;
 182
 183                         print_partition_extended(dev_desc, lba_start,
 184                                 ext_part_sector == 0  ? lba_start : relative,
 185                                 part_num, disksig);
 186                 }
 187         }
 188
 189         return;
 190 }
 191
 192
 193 /*  Print a partition that is relative to its Extended partition table
 194  */
 195 static int part_get_info_extended(struct blk_desc *dev_desc,
 196                                   lbaint_t ext_part_sector, lbaint_t relative,
 197                                   int part_num, int which_part,
 198                                   disk_partition_t *info, unsigned int disksig)
 199 {
 200         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 201         dos_partition_t *pt;
 202         int i;
 203         int dos_type;
 204
 205         /* set a maximum recursion level */
 206         if (part_num > MAX_EXT_PARTS)
 207         {
 208                 printf("** Nested DOS partitions detected, stopping **\n");
 209                 return -1;
 210     }
 211
 212         if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
 213                 printf ("** Can't read partition table on %d:" LBAFU " **\n",
 214                         dev_desc->devnum, ext_part_sector);
 215                 return -1;
 216         }
 217         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 218                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 219                 printf ("bad MBR sector signature 0x%02x%02x\n",
 220                         buffer[DOS_PART_MAGIC_OFFSET],
 221                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 222                 return -1;
 223         }
 224
 225 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 226         if (!ext_part_sector)
 227                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 228 #endif
 229
 230         /* Print all primary/logical partitions */
 231         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 232         for (i = 0; i < 4; i++, pt++) {
 233                 /*
 234                  * fdisk does not show the extended partitions that
 235                  * are not in the MBR
 236                  */
 237                 if (((pt->boot_ind & ~0x80) == 0) &&
 238                     (pt->sys_ind != 0) &&
 239                     (part_num == which_part) &&
 240                     (ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) {
 241                         info->blksz = DOS_PART_DEFAULT_SECTOR;
 242                         info->start = (lbaint_t)(ext_part_sector +
 243                                         le32_to_int(pt->start4));
 244                         info->size  = (lbaint_t)le32_to_int(pt->size4);
 245                         part_set_generic_name(dev_desc, part_num,
 246                                               (char *)info->name);
 247                         /* sprintf(info->type, "%d, pt->sys_ind); */
 248                         strcpy((char *)info->type, "U-Boot");
 249                         info->bootable = is_bootable(pt);
 250 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 251                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 252 #endif
 253                         info->sys_ind = pt->sys_ind;
 254                         return 0;
 255                 }
 256
 257                 /* Reverse engr the fdisk part# assignment rule! */
 258                 if ((ext_part_sector == 0) ||
 259                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 260                         part_num++;
 261                 }
 262         }
 263
 264         /* Follows the extended partitions */
 265         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 266         for (i = 0; i < 4; i++, pt++) {
 267                 if (is_extended (pt->sys_ind)) {
 268                         lbaint_t lba_start
 269                                 = le32_to_int (pt->start4) + relative;
 270
 271                         return part_get_info_extended(dev_desc, lba_start,
 272                                  ext_part_sector == 0 ? lba_start : relative,
 273                                  part_num, which_part, info, disksig);
 274                 }
 275         }
 276
 277         /* Check for DOS PBR if no partition is found */
 278         dos_type = test_block_type(buffer);
 279
 280         if (dos_type == DOS_PBR) {
 281                 info->start = 0;
 282                 info->size = dev_desc->lba;
 283                 info->blksz = DOS_PART_DEFAULT_SECTOR;
 284                 info->bootable = 0;
 285                 strcpy((char *)info->type, "U-Boot");
 286 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 287                 info->uuid[0] = 0;
 288 #endif
 289                 return 0;
 290         }
 291
 292         return -1;
 293 }
 294
 295 void part_print_dos(struct blk_desc *dev_desc)
 296 {
 297         printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
 298         print_partition_extended(dev_desc, 0, 0, 1, 0);
 299 }
 300
 301 int part_get_info_dos(struct blk_desc *dev_desc, int part,
 302                       disk_partition_t *info)
 303 {
 304         return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 305 }
 306
 307 int is_valid_dos_buf(void *buf)
 308 {
 309         return test_block_type(buf) == DOS_MBR ? 0 : -1;
 310 }
 311
 312 int write_mbr_partition(struct blk_desc *dev_desc, void *buf)
 313 {
 314         if (is_valid_dos_buf(buf))
 315                 return -1;
 316
 317         /* write MBR */
 318         if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
 319                 printf("%s: failed writing '%s' (1 blks at 0x0)\n",
 320                        __func__, "MBR");
 321                 return 1;
 322         }
 323
 324         return 0;
 325 }
 326
 327 U_BOOT_PART_TYPE(dos) = {
 328         .name           = "DOS",
 329         .part_type      = PART_TYPE_DOS,
 330         .max_entries    = DOS_ENTRY_NUMBERS,
 331         .get_info       = part_get_info_ptr(part_get_info_dos),
 332         .print          = part_print_ptr(part_print_dos),
 333         .test           = part_test_dos,
 334 };
 335
 336 #endif