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