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  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 /*
  26  * Support for harddisk partitions.
  27  *
  28  * To be compatible with LinuxPPC and Apple we use the standard Apple
  29  * SCSI disk partitioning scheme. For more information see:
  30  * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
  31  */
  32
  33 #include <common.h>
  34 #include <command.h>
  35 #include <ide.h>
  36 #include "part_dos.h"
  37
  38 #if defined(CONFIG_CMD_IDE) || \
  39     defined(CONFIG_CMD_SATA) || \
  40     defined(CONFIG_CMD_SCSI) || \
  41     defined(CONFIG_CMD_USB) || \
  42     defined(CONFIG_MMC) || \
  43     defined(CONFIG_SYSTEMACE)
  44
  45 /* Convert char[4] in little endian format to the host format integer
  46  */
  47 static inline int le32_to_int(unsigned char *le32)
  48 {
  49     return ((le32[3] << 24) +
  50             (le32[2] << 16) +
  51             (le32[1] << 8) +
  52              le32[0]
  53            );
  54 }
  55
  56 static inline int is_extended(int part_type)
  57 {
  58     return (part_type == 0x5 ||
  59             part_type == 0xf ||
  60             part_type == 0x85);
  61 }
  62
  63 static inline int is_bootable(dos_partition_t *p)
  64 {
  65         return p->boot_ind == 0x80;
  66 }
  67
  68 static void print_one_part (dos_partition_t *p, int ext_part_sector, int part_num)
  69 {
  70         int lba_start = ext_part_sector + le32_to_int (p->start4);
  71         int lba_size  = le32_to_int (p->size4);
  72
  73         printf("%5d\t\t%10d\t%10d\t%2x%s%s\n",
  74                 part_num, lba_start, lba_size, p->sys_ind,
  75                 (is_extended(p->sys_ind) ? " Extd" : ""),
  76                 (is_bootable(p) ? " Boot" : ""));
  77 }
  78
  79 static int test_block_type(unsigned char *buffer)
  80 {
  81         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  82             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  83                 return (-1);
  84         } /* no DOS Signature at all */
  85         if (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],"FAT",3)==0 ||
  86             strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],"FAT32",5)==0) {
  87                 return DOS_PBR; /* is PBR */
  88         }
  89         return DOS_MBR;     /* Is MBR */
  90 }
  91
  92
  93 int test_part_dos (block_dev_desc_t *dev_desc)
  94 {
  95         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
  96
  97         if (dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1)
  98                 return -1;
  99
 100         if (test_block_type(buffer) != DOS_MBR)
 101                 return -1;
 102
 103         return 0;
 104 }
 105
 106 /*  Print a partition that is relative to its Extended partition table
 107  */
 108 static void print_partition_extended (block_dev_desc_t *dev_desc, int ext_part_sector, int relative,
 109                                                            int part_num)
 110 {
 111         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 112         dos_partition_t *pt;
 113         int i;
 114
 115         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 116                 printf ("** Can't read partition table on %d:%d **\n",
 117                         dev_desc->dev, ext_part_sector);
 118                 return;
 119         }
 120         i=test_block_type(buffer);
 121         if (i != DOS_MBR) {
 122                 printf ("bad MBR sector signature 0x%02x%02x\n",
 123                         buffer[DOS_PART_MAGIC_OFFSET],
 124                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 125                 return;
 126         }
 127
 128         /* Print all primary/logical partitions */
 129         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 130         for (i = 0; i < 4; i++, pt++) {
 131                 /*
 132                  * fdisk does not show the extended partitions that
 133                  * are not in the MBR
 134                  */
 135
 136                 if ((pt->sys_ind != 0) &&
 137                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 138                         print_one_part (pt, ext_part_sector, part_num);
 139                 }
 140
 141                 /* Reverse engr the fdisk part# assignment rule! */
 142                 if ((ext_part_sector == 0) ||
 143                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 144                         part_num++;
 145                 }
 146         }
 147
 148         /* Follows the extended partitions */
 149         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 150         for (i = 0; i < 4; i++, pt++) {
 151                 if (is_extended (pt->sys_ind)) {
 152                         int lba_start = le32_to_int (pt->start4) + relative;
 153
 154                         print_partition_extended (dev_desc, lba_start,
 155                                                   ext_part_sector == 0  ? lba_start
 156                                                                         : relative,
 157                                                   part_num);
 158                 }
 159         }
 160
 161         return;
 162 }
 163
 164
 165 /*  Print a partition that is relative to its Extended partition table
 166  */
 167 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
 168                                  int relative, int part_num,
 169                                  int which_part, disk_partition_t *info,
 170                                  unsigned int disksig)
 171 {
 172         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 173         dos_partition_t *pt;
 174         int i;
 175
 176         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 177                 printf ("** Can't read partition table on %d:%d **\n",
 178                         dev_desc->dev, ext_part_sector);
 179                 return -1;
 180         }
 181         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 182                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 183                 printf ("bad MBR sector signature 0x%02x%02x\n",
 184                         buffer[DOS_PART_MAGIC_OFFSET],
 185                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 186                 return -1;
 187         }
 188
 189 #ifdef CONFIG_PARTITION_UUIDS
 190         if (!ext_part_sector)
 191                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 192 #endif
 193
 194         /* Print all primary/logical partitions */
 195         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 196         for (i = 0; i < 4; i++, pt++) {
 197                 /*
 198                  * fdisk does not show the extended partitions that
 199                  * are not in the MBR
 200                  */
 201                 if (((pt->boot_ind & ~0x80) == 0) &&
 202                     (pt->sys_ind != 0) &&
 203                     (part_num == which_part) &&
 204                     (is_extended(pt->sys_ind) == 0)) {
 205                         info->blksz = 512;
 206                         info->start = ext_part_sector + le32_to_int (pt->start4);
 207                         info->size  = 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         return -1;
 260 }
 261
 262 void print_part_dos (block_dev_desc_t *dev_desc)
 263 {
 264         printf ("Partition     Start Sector     Num Sectors     Type\n");
 265         print_partition_extended (dev_desc, 0, 0, 1);
 266 }
 267
 268 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 269 {
 270         return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 271 }
 272
 273
 274 #endif