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 /* Convert char[4] in little endian format to the host format integer
  25  */
  26 static inline int le32_to_int(unsigned char *le32)
  27 {
  28     return ((le32[3] << 24) +
  29             (le32[2] << 16) +
  30             (le32[1] << 8) +
  31              le32[0]
  32            );
  33 }
  34
  35 static inline int is_extended(int part_type)
  36 {
  37     return (part_type == 0x5 ||
  38             part_type == 0xf ||
  39             part_type == 0x85);
  40 }
  41
  42 static inline int is_bootable(dos_partition_t *p)
  43 {
  44         return p->boot_ind == 0x80;
  45 }
  46
  47 static void print_one_part(dos_partition_t *p, int ext_part_sector,
  48                            int part_num, unsigned int disksig)
  49 {
  50         int lba_start = ext_part_sector + le32_to_int (p->start4);
  51         int lba_size  = le32_to_int (p->size4);
  52
  53         printf("%3d\t%-10d\t%-10d\t%08x-%02x\t%02x%s%s\n",
  54                 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
  55                 (is_extended(p->sys_ind) ? " Extd" : ""),
  56                 (is_bootable(p) ? " Boot" : ""));
  57 }
  58
  59 static int test_block_type(unsigned char *buffer)
  60 {
  61         int slot;
  62         struct dos_partition *p;
  63
  64         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  65             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  66                 return (-1);
  67         } /* no DOS Signature at all */
  68         p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
  69         for (slot = 0; slot < 3; slot++) {
  70                 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
  71                         if (!slot &&
  72                             (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
  73                                      "FAT", 3) == 0 ||
  74                              strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
  75                                      "FAT32", 5) == 0)) {
  76                                 return DOS_PBR; /* is PBR */
  77                         } else {
  78                                 return -1;
  79                         }
  80                 }
  81         }
  82         return DOS_MBR;     /* Is MBR */
  83 }
  84
  85
  86 int test_part_dos (block_dev_desc_t *dev_desc)
  87 {
  88         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
  89
  90         if (dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1)
  91                 return -1;
  92
  93         if (test_block_type(buffer) != DOS_MBR)
  94                 return -1;
  95
  96         return 0;
  97 }
  98
  99 /*  Print a partition that is relative to its Extended partition table
 100  */
 101 static void print_partition_extended(block_dev_desc_t *dev_desc,
 102                                      int ext_part_sector, int relative,
 103                                      int part_num, unsigned int disksig)
 104 {
 105         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 106         dos_partition_t *pt;
 107         int i;
 108
 109         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 110                 printf ("** Can't read partition table on %d:%d **\n",
 111                         dev_desc->dev, ext_part_sector);
 112                 return;
 113         }
 114         i=test_block_type(buffer);
 115         if (i != DOS_MBR) {
 116                 printf ("bad MBR sector signature 0x%02x%02x\n",
 117                         buffer[DOS_PART_MAGIC_OFFSET],
 118                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 119                 return;
 120         }
 121
 122         if (!ext_part_sector)
 123                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 124
 125         /* Print all primary/logical partitions */
 126         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 127         for (i = 0; i < 4; i++, pt++) {
 128                 /*
 129                  * fdisk does not show the extended partitions that
 130                  * are not in the MBR
 131                  */
 132
 133                 if ((pt->sys_ind != 0) &&
 134                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 135                         print_one_part(pt, ext_part_sector, part_num, disksig);
 136                 }
 137
 138                 /* Reverse engr the fdisk part# assignment rule! */
 139                 if ((ext_part_sector == 0) ||
 140                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 141                         part_num++;
 142                 }
 143         }
 144
 145         /* Follows the extended partitions */
 146         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 147         for (i = 0; i < 4; i++, pt++) {
 148                 if (is_extended (pt->sys_ind)) {
 149                         int lba_start = le32_to_int (pt->start4) + relative;
 150
 151                         print_partition_extended(dev_desc, lba_start,
 152                                 ext_part_sector == 0  ? lba_start : relative,
 153                                 part_num, disksig);
 154                 }
 155         }
 156
 157         return;
 158 }
 159
 160
 161 /*  Print a partition that is relative to its Extended partition table
 162  */
 163 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
 164                                  int relative, int part_num,
 165                                  int which_part, disk_partition_t *info,
 166                                  unsigned int disksig)
 167 {
 168         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 169         dos_partition_t *pt;
 170         int i;
 171
 172         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 173                 printf ("** Can't read partition table on %d:%d **\n",
 174                         dev_desc->dev, ext_part_sector);
 175                 return -1;
 176         }
 177         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 178                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 179                 printf ("bad MBR sector signature 0x%02x%02x\n",
 180                         buffer[DOS_PART_MAGIC_OFFSET],
 181                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 182                 return -1;
 183         }
 184
 185 #ifdef CONFIG_PARTITION_UUIDS
 186         if (!ext_part_sector)
 187                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 188 #endif
 189
 190         /* Print all primary/logical partitions */
 191         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 192         for (i = 0; i < 4; i++, pt++) {
 193                 /*
 194                  * fdisk does not show the extended partitions that
 195                  * are not in the MBR
 196                  */
 197                 if (((pt->boot_ind & ~0x80) == 0) &&
 198                     (pt->sys_ind != 0) &&
 199                     (part_num == which_part) &&
 200                     (is_extended(pt->sys_ind) == 0)) {
 201                         info->blksz = 512;
 202                         info->start = ext_part_sector + le32_to_int (pt->start4);
 203                         info->size  = le32_to_int (pt->size4);
 204                         switch(dev_desc->if_type) {
 205                                 case IF_TYPE_IDE:
 206                                 case IF_TYPE_SATA:
 207                                 case IF_TYPE_ATAPI:
 208                                         sprintf ((char *)info->name, "hd%c%d",
 209                                                 'a' + dev_desc->dev, part_num);
 210                                         break;
 211                                 case IF_TYPE_SCSI:
 212                                         sprintf ((char *)info->name, "sd%c%d",
 213                                                 'a' + dev_desc->dev, part_num);
 214                                         break;
 215                                 case IF_TYPE_USB:
 216                                         sprintf ((char *)info->name, "usbd%c%d",
 217                                                 'a' + dev_desc->dev, part_num);
 218                                         break;
 219                                 case IF_TYPE_DOC:
 220                                         sprintf ((char *)info->name, "docd%c%d",
 221                                                 'a' + dev_desc->dev, part_num);
 222                                         break;
 223                                 default:
 224                                         sprintf ((char *)info->name, "xx%c%d",
 225                                                 'a' + dev_desc->dev, part_num);
 226                                         break;
 227                         }
 228                         /* sprintf(info->type, "%d, pt->sys_ind); */
 229                         sprintf ((char *)info->type, "U-Boot");
 230                         info->bootable = is_bootable(pt);
 231 #ifdef CONFIG_PARTITION_UUIDS
 232                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 233 #endif
 234                         return 0;
 235                 }
 236
 237                 /* Reverse engr the fdisk part# assignment rule! */
 238                 if ((ext_part_sector == 0) ||
 239                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 240                         part_num++;
 241                 }
 242         }
 243
 244         /* Follows the extended partitions */
 245         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 246         for (i = 0; i < 4; i++, pt++) {
 247                 if (is_extended (pt->sys_ind)) {
 248                         int lba_start = le32_to_int (pt->start4) + relative;
 249
 250                         return get_partition_info_extended (dev_desc, lba_start,
 251                                  ext_part_sector == 0 ? lba_start : relative,
 252                                  part_num, which_part, info, disksig);
 253                 }
 254         }
 255         return -1;
 256 }
 257
 258 void print_part_dos (block_dev_desc_t *dev_desc)
 259 {
 260         printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
 261         print_partition_extended(dev_desc, 0, 0, 1, 0);
 262 }
 263
 264 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 265 {
 266         return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 267 }
 268
 269
 270 #endif