disk/part_dos.c

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