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             strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],"FAT32",5)==0) {
  82                 return DOS_PBR; /* is PBR */
  83         }
  84         return DOS_MBR;     /* Is MBR */
  85 }
  86
  87
  88 int test_part_dos (block_dev_desc_t *dev_desc)
  89 {
  90         unsigned char buffer[dev_desc->blksz];
  91
  92         if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1) ||
  93             (buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  94             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  95                 return (-1);
  96         }
  97         return (0);
  98 }
  99
 100 /*  Print a partition that is relative to its Extended partition table
 101  */
 102 static void print_partition_extended (block_dev_desc_t *dev_desc, int ext_part_sector, int relative,
 103                                                            int part_num)
 104 {
 105         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==-1) {
 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         if(i==DOS_PBR) {
 122                 printf ("    1\t\t         0\t%10ld\t%2x\n",
 123                         dev_desc->lba, buffer[DOS_PBR_MEDIA_TYPE_OFFSET]);
 124                 return;
 125         }
 126         /* Print all primary/logical partitions */
 127         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 128         for (i = 0; i < 4; i++, pt++) {
 129                 /*
 130                  * fdisk does not show the extended partitions that
 131                  * are not in the MBR
 132                  */
 133
 134                 if ((pt->sys_ind != 0) &&
 135                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 136                         print_one_part (pt, ext_part_sector, part_num);
 137                 }
 138
 139                 /* Reverse engr the fdisk part# assignment rule! */
 140                 if ((ext_part_sector == 0) ||
 141                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 142                         part_num++;
 143                 }
 144         }
 145
 146         /* Follows the extended partitions */
 147         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 148         for (i = 0; i < 4; i++, pt++) {
 149                 if (is_extended (pt->sys_ind)) {
 150                         int lba_start = le32_to_int (pt->start4) + relative;
 151
 152                         print_partition_extended (dev_desc, lba_start,
 153                                                   ext_part_sector == 0  ? lba_start
 154                                                                         : relative,
 155                                                   part_num);
 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 {
 169         unsigned char buffer[dev_desc->blksz];
 170         dos_partition_t *pt;
 171         int i;
 172
 173         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 174                 printf ("** Can't read partition table on %d:%d **\n",
 175                         dev_desc->dev, ext_part_sector);
 176                 return -1;
 177         }
 178         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 179                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 180                 printf ("bad MBR sector signature 0x%02x%02x\n",
 181                         buffer[DOS_PART_MAGIC_OFFSET],
 182                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 183                 return -1;
 184         }
 185
 186         /* Print all primary/logical partitions */
 187         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 188         for (i = 0; i < 4; i++, pt++) {
 189                 /*
 190                  * fdisk does not show the extended partitions that
 191                  * are not in the MBR
 192                  */
 193                 if (((pt->boot_ind & ~0x80) == 0) &&
 194                     (pt->sys_ind != 0) &&
 195                     (part_num == which_part) &&
 196                     (is_extended(pt->sys_ind) == 0)) {
 197                         info->blksz = 512;
 198                         info->start = ext_part_sector + le32_to_int (pt->start4);
 199                         info->size  = le32_to_int (pt->size4);
 200                         switch(dev_desc->if_type) {
 201                                 case IF_TYPE_IDE:
 202                                 case IF_TYPE_SATA:
 203                                 case IF_TYPE_ATAPI:
 204                                         sprintf ((char *)info->name, "hd%c%d",
 205                                                 'a' + dev_desc->dev, part_num);
 206                                         break;
 207                                 case IF_TYPE_SCSI:
 208                                         sprintf ((char *)info->name, "sd%c%d",
 209                                                 'a' + dev_desc->dev, part_num);
 210                                         break;
 211                                 case IF_TYPE_USB:
 212                                         sprintf ((char *)info->name, "usbd%c%d",
 213                                                 'a' + dev_desc->dev, part_num);
 214                                         break;
 215                                 case IF_TYPE_DOC:
 216                                         sprintf ((char *)info->name, "docd%c%d",
 217                                                 'a' + dev_desc->dev, part_num);
 218                                         break;
 219                                 default:
 220                                         sprintf ((char *)info->name, "xx%c%d",
 221                                                 'a' + dev_desc->dev, part_num);
 222                                         break;
 223                         }
 224                         /* sprintf(info->type, "%d, pt->sys_ind); */
 225                         sprintf ((char *)info->type, "U-Boot");
 226                         return 0;
 227                 }
 228
 229                 /* Reverse engr the fdisk part# assignment rule! */
 230                 if ((ext_part_sector == 0) ||
 231                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 232                         part_num++;
 233                 }
 234         }
 235
 236         /* Follows the extended partitions */
 237         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 238         for (i = 0; i < 4; i++, pt++) {
 239                 if (is_extended (pt->sys_ind)) {
 240                         int lba_start = le32_to_int (pt->start4) + relative;
 241
 242                         return get_partition_info_extended (dev_desc, lba_start,
 243                                  ext_part_sector == 0 ? lba_start : relative,
 244                                  part_num, which_part, info);
 245                 }
 246         }
 247         return -1;
 248 }
 249
 250 void print_part_dos (block_dev_desc_t *dev_desc)
 251 {
 252         printf ("Partition     Start Sector     Num Sectors     Type\n");
 253         print_partition_extended (dev_desc, 0, 0, 1);
 254 }
 255
 256 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 257 {
 258         return get_partition_info_extended (dev_desc, 0, 0, 1, part, info);
 259 }
 260
 261
 262 #endif