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 "part_dos.h"
  21
  22 #ifdef HAVE_BLOCK_DEVICE
  23
  24 #define DOS_PART_DEFAULT_SECTOR 512
  25
  26 /* Convert char[4] in little endian format to the host format integer
  27  */
  28 static inline int le32_to_int(unsigned char *le32)
  29 {
  30     return ((le32[3] << 24) +
  31             (le32[2] << 16) +
  32             (le32[1] << 8) +
  33              le32[0]
  34            );
  35 }
  36
  37 static inline int is_extended(int part_type)
  38 {
  39     return (part_type == 0x5 ||
  40             part_type == 0xf ||
  41             part_type == 0x85);
  42 }
  43
  44 static inline int is_bootable(dos_partition_t *p)
  45 {
  46         return p->boot_ind == 0x80;
  47 }
  48
  49 static void print_one_part(dos_partition_t *p, int ext_part_sector,
  50                            int part_num, unsigned int disksig)
  51 {
  52         int lba_start = ext_part_sector + le32_to_int (p->start4);
  53         int lba_size  = le32_to_int (p->size4);
  54
  55         printf("%3d\t%-10d\t%-10d\t%08x-%02x\t%02x%s%s\n",
  56                 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
  57                 (is_extended(p->sys_ind) ? " Extd" : ""),
  58                 (is_bootable(p) ? " Boot" : ""));
  59 }
  60
  61 static int test_block_type(unsigned char *buffer)
  62 {
  63         int slot;
  64         struct dos_partition *p;
  65
  66         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  67             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  68                 return (-1);
  69         } /* no DOS Signature at all */
  70         p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
  71         for (slot = 0; slot < 3; slot++) {
  72                 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
  73                         if (!slot &&
  74                             (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
  75                                      "FAT", 3) == 0 ||
  76                              strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
  77                                      "FAT32", 5) == 0)) {
  78                                 return DOS_PBR; /* is PBR */
  79                         } else {
  80                                 return -1;
  81                         }
  82                 }
  83         }
  84         return DOS_MBR;     /* Is MBR */
  85 }
  86
  87
  88 int test_part_dos (block_dev_desc_t *dev_desc)
  89 {
  90         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
  91
  92         if (dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1)
  93                 return -1;
  94
  95         if (test_block_type(buffer) != DOS_MBR)
  96                 return -1;
  97
  98         return 0;
  99 }
 100
 101 /*  Print a partition that is relative to its Extended partition table
 102  */
 103 static void print_partition_extended(block_dev_desc_t *dev_desc,
 104                                      int ext_part_sector, int relative,
 105                                      int part_num, unsigned int disksig)
 106 {
 107         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 108         dos_partition_t *pt;
 109         int i;
 110
 111         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 112                 printf ("** Can't read partition table on %d:%d **\n",
 113                         dev_desc->dev, ext_part_sector);
 114                 return;
 115         }
 116         i=test_block_type(buffer);
 117         if (i != DOS_MBR) {
 118                 printf ("bad MBR sector signature 0x%02x%02x\n",
 119                         buffer[DOS_PART_MAGIC_OFFSET],
 120                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 121                 return;
 122         }
 123
 124         if (!ext_part_sector)
 125                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 126
 127         /* Print all primary/logical partitions */
 128         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 129         for (i = 0; i < 4; i++, pt++) {
 130                 /*
 131                  * fdisk does not show the extended partitions that
 132                  * are not in the MBR
 133                  */
 134
 135                 if ((pt->sys_ind != 0) &&
 136                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 137                         print_one_part(pt, ext_part_sector, part_num, disksig);
 138                 }
 139
 140                 /* Reverse engr the fdisk part# assignment rule! */
 141                 if ((ext_part_sector == 0) ||
 142                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 143                         part_num++;
 144                 }
 145         }
 146
 147         /* Follows the extended partitions */
 148         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 149         for (i = 0; i < 4; i++, pt++) {
 150                 if (is_extended (pt->sys_ind)) {
 151                         int lba_start = le32_to_int (pt->start4) + relative;
 152
 153                         print_partition_extended(dev_desc, lba_start,
 154                                 ext_part_sector == 0  ? lba_start : relative,
 155                                 part_num, disksig);
 156                 }
 157         }
 158
 159         return;
 160 }
 161
 162
 163 /*  Print a partition that is relative to its Extended partition table
 164  */
 165 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
 166                                  int relative, int part_num,
 167                                  int which_part, disk_partition_t *info,
 168                                  unsigned int disksig)
 169 {
 170         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 171         dos_partition_t *pt;
 172         int i;
 173         int dos_type;
 174
 175         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 176                 printf ("** Can't read partition table on %d:%d **\n",
 177                         dev_desc->dev, ext_part_sector);
 178                 return -1;
 179         }
 180         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 181                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 182                 printf ("bad MBR sector signature 0x%02x%02x\n",
 183                         buffer[DOS_PART_MAGIC_OFFSET],
 184                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 185                 return -1;
 186         }
 187
 188 #ifdef CONFIG_PARTITION_UUIDS
 189         if (!ext_part_sector)
 190                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 191 #endif
 192
 193         /* Print all primary/logical partitions */
 194         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 195         for (i = 0; i < 4; i++, pt++) {
 196                 /*
 197                  * fdisk does not show the extended partitions that
 198                  * are not in the MBR
 199                  */
 200                 if (((pt->boot_ind & ~0x80) == 0) &&
 201                     (pt->sys_ind != 0) &&
 202                     (part_num == which_part) &&
 203                     (is_extended(pt->sys_ind) == 0)) {
 204                         info->blksz = DOS_PART_DEFAULT_SECTOR;
 205                         info->start = (lbaint_t)(ext_part_sector +
 206                                         le32_to_int(pt->start4));
 207                         info->size  = (lbaint_t)le32_to_int(pt->size4);
 208                         switch(dev_desc->if_type) {
 209                                 case IF_TYPE_IDE:
 210                                 case IF_TYPE_SATA:
 211                                 case IF_TYPE_ATAPI:
 212                                         sprintf ((char *)info->name, "hd%c%d",
 213                                                 'a' + dev_desc->dev, part_num);
 214                                         break;
 215                                 case IF_TYPE_SCSI:
 216                                         sprintf ((char *)info->name, "sd%c%d",
 217                                                 'a' + dev_desc->dev, part_num);
 218                                         break;
 219                                 case IF_TYPE_USB:
 220                                         sprintf ((char *)info->name, "usbd%c%d",
 221                                                 'a' + dev_desc->dev, part_num);
 222                                         break;
 223                                 case IF_TYPE_DOC:
 224                                         sprintf ((char *)info->name, "docd%c%d",
 225                                                 'a' + dev_desc->dev, part_num);
 226                                         break;
 227                                 default:
 228                                         sprintf ((char *)info->name, "xx%c%d",
 229                                                 'a' + dev_desc->dev, part_num);
 230                                         break;
 231                         }
 232                         /* sprintf(info->type, "%d, pt->sys_ind); */
 233                         sprintf ((char *)info->type, "U-Boot");
 234                         info->bootable = is_bootable(pt);
 235 #ifdef CONFIG_PARTITION_UUIDS
 236                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 237 #endif
 238                         return 0;
 239                 }
 240
 241                 /* Reverse engr the fdisk part# assignment rule! */
 242                 if ((ext_part_sector == 0) ||
 243                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 244                         part_num++;
 245                 }
 246         }
 247
 248         /* Follows the extended partitions */
 249         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 250         for (i = 0; i < 4; i++, pt++) {
 251                 if (is_extended (pt->sys_ind)) {
 252                         int lba_start = le32_to_int (pt->start4) + relative;
 253
 254                         return get_partition_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                 sprintf ((char *)info->type, "U-Boot");
 269 #ifdef CONFIG_PARTITION_UUIDS
 270                 info->uuid[0] = 0;
 271 #endif
 272                 return 0;
 273         }
 274
 275         return -1;
 276 }
 277
 278 void print_part_dos (block_dev_desc_t *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 get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 285 {
 286         return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 287 }
 288
 289
 290 #endif