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 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         ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, dev_desc->blksz);
  93
  94         if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
  95                 return -1;
  96
  97         if (test_block_type((unsigned char *)mbr) != DOS_MBR)
  98                 return -1;
  99
 100         if (dev_desc->sig_type == SIG_TYPE_NONE &&
 101             mbr->unique_mbr_signature != 0) {
 102                 dev_desc->sig_type = SIG_TYPE_MBR;
 103                 dev_desc->mbr_sig = mbr->unique_mbr_signature;
 104         }
 105
 106         return 0;
 107 }
 108
 109 /*  Print a partition that is relative to its Extended partition table
 110  */
 111 static void print_partition_extended(struct blk_desc *dev_desc,
 112                                      lbaint_t ext_part_sector,
 113                                      lbaint_t relative,
 114                                      int part_num, unsigned int disksig)
 115 {
 116         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 117         dos_partition_t *pt;
 118         int i;
 119
 120         if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
 121                 printf ("** Can't read partition table on %d:" LBAFU " **\n",
 122                         dev_desc->devnum, ext_part_sector);
 123                 return;
 124         }
 125         i=test_block_type(buffer);
 126         if (i != DOS_MBR) {
 127                 printf ("bad MBR sector signature 0x%02x%02x\n",
 128                         buffer[DOS_PART_MAGIC_OFFSET],
 129                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 130                 return;
 131         }
 132
 133         if (!ext_part_sector)
 134                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 135
 136         /* Print all primary/logical partitions */
 137         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 138         for (i = 0; i < 4; i++, pt++) {
 139                 /*
 140                  * fdisk does not show the extended partitions that
 141                  * are not in the MBR
 142                  */
 143
 144                 if ((pt->sys_ind != 0) &&
 145                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 146                         print_one_part(pt, ext_part_sector, part_num, disksig);
 147                 }
 148
 149                 /* Reverse engr the fdisk part# assignment rule! */
 150                 if ((ext_part_sector == 0) ||
 151                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 152                         part_num++;
 153                 }
 154         }
 155
 156         /* Follows the extended partitions */
 157         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 158         for (i = 0; i < 4; i++, pt++) {
 159                 if (is_extended (pt->sys_ind)) {
 160                         lbaint_t lba_start
 161                                 = le32_to_int (pt->start4) + relative;
 162
 163                         print_partition_extended(dev_desc, lba_start,
 164                                 ext_part_sector == 0  ? lba_start : relative,
 165                                 part_num, disksig);
 166                 }
 167         }
 168
 169         return;
 170 }
 171
 172
 173 /*  Print a partition that is relative to its Extended partition table
 174  */
 175 static int part_get_info_extended(struct blk_desc *dev_desc,
 176                                   lbaint_t ext_part_sector, lbaint_t relative,
 177                                   int part_num, int which_part,
 178                                   disk_partition_t *info, unsigned int disksig)
 179 {
 180         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 181         dos_partition_t *pt;
 182         int i;
 183         int dos_type;
 184
 185         if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
 186                 printf ("** Can't read partition table on %d:" LBAFU " **\n",
 187                         dev_desc->devnum, ext_part_sector);
 188                 return -1;
 189         }
 190         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 191                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 192                 printf ("bad MBR sector signature 0x%02x%02x\n",
 193                         buffer[DOS_PART_MAGIC_OFFSET],
 194                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 195                 return -1;
 196         }
 197
 198 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 199         if (!ext_part_sector)
 200                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 201 #endif
 202
 203         /* Print all primary/logical partitions */
 204         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 205         for (i = 0; i < 4; i++, pt++) {
 206                 /*
 207                  * fdisk does not show the extended partitions that
 208                  * are not in the MBR
 209                  */
 210                 if (((pt->boot_ind & ~0x80) == 0) &&
 211                     (pt->sys_ind != 0) &&
 212                     (part_num == which_part) &&
 213                     (is_extended(pt->sys_ind) == 0)) {
 214                         info->blksz = DOS_PART_DEFAULT_SECTOR;
 215                         info->start = (lbaint_t)(ext_part_sector +
 216                                         le32_to_int(pt->start4));
 217                         info->size  = (lbaint_t)le32_to_int(pt->size4);
 218                         part_set_generic_name(dev_desc, part_num,
 219                                               (char *)info->name);
 220                         /* sprintf(info->type, "%d, pt->sys_ind); */
 221                         strcpy((char *)info->type, "U-Boot");
 222                         info->bootable = is_bootable(pt);
 223 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 224                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 225 #endif
 226                         info->sys_ind = pt->sys_ind;
 227                         return 0;
 228                 }
 229
 230                 /* Reverse engr the fdisk part# assignment rule! */
 231                 if ((ext_part_sector == 0) ||
 232                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 233                         part_num++;
 234                 }
 235         }
 236
 237         /* Follows the extended partitions */
 238         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 239         for (i = 0; i < 4; i++, pt++) {
 240                 if (is_extended (pt->sys_ind)) {
 241                         lbaint_t lba_start
 242                                 = le32_to_int (pt->start4) + relative;
 243
 244                         return part_get_info_extended(dev_desc, lba_start,
 245                                  ext_part_sector == 0 ? lba_start : relative,
 246                                  part_num, which_part, info, disksig);
 247                 }
 248         }
 249
 250         /* Check for DOS PBR if no partition is found */
 251         dos_type = test_block_type(buffer);
 252
 253         if (dos_type == DOS_PBR) {
 254                 info->start = 0;
 255                 info->size = dev_desc->lba;
 256                 info->blksz = DOS_PART_DEFAULT_SECTOR;
 257                 info->bootable = 0;
 258                 strcpy((char *)info->type, "U-Boot");
 259 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 260                 info->uuid[0] = 0;
 261 #endif
 262                 return 0;
 263         }
 264
 265         return -1;
 266 }
 267
 268 void part_print_dos(struct blk_desc *dev_desc)
 269 {
 270         printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
 271         print_partition_extended(dev_desc, 0, 0, 1, 0);
 272 }
 273
 274 int part_get_info_dos(struct blk_desc *dev_desc, int part,
 275                       disk_partition_t *info)
 276 {
 277         return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 278 }
 279
 280 int is_valid_dos_buf(void *buf)
 281 {
 282         return test_block_type(buf) == DOS_MBR ? 0 : -1;
 283 }
 284
 285 int write_mbr_partition(struct blk_desc *dev_desc, void *buf)
 286 {
 287         if (is_valid_dos_buf(buf))
 288                 return -1;
 289
 290         /* write MBR */
 291         if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
 292                 printf("%s: failed writing '%s' (1 blks at 0x0)\n",
 293                        __func__, "MBR");
 294                 return 1;
 295         }
 296
 297         return 0;
 298 }
 299
 300 U_BOOT_PART_TYPE(dos) = {
 301         .name           = "DOS",
 302         .part_type      = PART_TYPE_DOS,
 303         .max_entries    = DOS_ENTRY_NUMBERS,
 304         .get_info       = part_get_info_ptr(part_get_info_dos),
 305         .print          = part_print_ptr(part_print_dos),
 306         .test           = part_test_dos,
 307 };
 308
 309 #endif