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 ((CONFIG_COMMANDS & CFG_CMD_IDE)    || \
  39      (CONFIG_COMMANDS & CFG_CMD_SCSI)   || \
  40      (CONFIG_COMMANDS & CFG_CMD_USB)    ) && defined(CONFIG_DOS_PARTITION)
  41
  42 /* Convert char[4] in little endian format to the host format integer
  43  */
  44 static inline int le32_to_int(unsigned char *le32)
  45 {
  46     return ((le32[3] << 24) +
  47             (le32[2] << 16) +
  48             (le32[1] << 8) +
  49              le32[0]
  50            );
  51 }
  52
  53 static inline int is_extended(int part_type)
  54 {
  55     return (part_type == 0x5 ||
  56             part_type == 0xf ||
  57             part_type == 0x85);
  58 }
  59
  60 static void print_one_part (dos_partition_t *p, int ext_part_sector, int part_num)
  61 {
  62         int lba_start = ext_part_sector + le32_to_int (p->start4);
  63         int lba_size  = le32_to_int (p->size4);
  64
  65         printf ("%5d\t\t%10d\t%10d\t%2x%s\n",
  66                 part_num, lba_start, lba_size, p->sys_ind,
  67                 (is_extended (p->sys_ind) ? " Extd" : ""));
  68 }
  69
  70
  71 int test_part_dos (block_dev_desc_t *dev_desc)
  72 {
  73         unsigned char buffer[DEFAULT_SECTOR_SIZE];
  74
  75         if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1) ||
  76             (buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  77             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  78                 return (-1);
  79         }
  80         return (0);
  81 }
  82
  83 /*  Print a partition that is relative to its Extended partition table
  84  */
  85 static void print_partition_extended (block_dev_desc_t *dev_desc, int ext_part_sector, int relative,
  86                                                            int part_num)
  87 {
  88         unsigned char buffer[DEFAULT_SECTOR_SIZE];
  89         dos_partition_t *pt;
  90         int i;
  91
  92         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
  93                 printf ("** Can't read partition table on %d:%d **\n",
  94                         dev_desc->dev, ext_part_sector);
  95                 return;
  96         }
  97         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
  98                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
  99                 printf ("bad MBR sector signature 0x%02x%02x\n",
 100                         buffer[DOS_PART_MAGIC_OFFSET],
 101                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 102                 return;
 103         }
 104
 105         /* Print all primary/logical partitions */
 106         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 107         for (i = 0; i < 4; i++, pt++) {
 108                 /*
 109                  * fdisk does not show the extended partitions that
 110                  * are not in the MBR
 111                  */
 112
 113                 if ((pt->sys_ind != 0) &&
 114                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 115                         print_one_part (pt, ext_part_sector, part_num);
 116                 }
 117
 118                 /* Reverse engr the fdisk part# assignment rule! */
 119                 if ((ext_part_sector == 0) ||
 120                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 121                         part_num++;
 122                 }
 123         }
 124
 125         /* Follows the extended partitions */
 126         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 127         for (i = 0; i < 4; i++, pt++) {
 128                 if (is_extended (pt->sys_ind)) {
 129                         int lba_start = le32_to_int (pt->start4) + relative;
 130
 131                         print_partition_extended (dev_desc, lba_start,
 132                                                   ext_part_sector == 0  ? lba_start
 133                                                                         : relative,
 134                                                   part_num);
 135                 }
 136         }
 137
 138         return;
 139 }
 140
 141
 142 /*  Print a partition that is relative to its Extended partition table
 143  */
 144 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
 145                                  int relative, int part_num,
 146                                  int which_part, disk_partition_t *info)
 147 {
 148         unsigned char buffer[DEFAULT_SECTOR_SIZE];
 149         dos_partition_t *pt;
 150         int i;
 151
 152         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 153                 printf ("** Can't read partition table on %d:%d **\n",
 154                         dev_desc->dev, ext_part_sector);
 155                 return -1;
 156         }
 157         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 158                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 159                 printf ("bad MBR sector signature 0x%02x%02x\n",
 160                         buffer[DOS_PART_MAGIC_OFFSET],
 161                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 162                 return -1;
 163         }
 164
 165         /* Print all primary/logical partitions */
 166         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 167         for (i = 0; i < 4; i++, pt++) {
 168                 /*
 169                  * fdisk does not show the extended partitions that
 170                  * are not in the MBR
 171                  */
 172                 if ((pt->sys_ind != 0) &&
 173                     (part_num == which_part) &&
 174                     (is_extended(pt->sys_ind) == 0)) {
 175                         info->blksz = 512;
 176                         info->start = ext_part_sector + le32_to_int (pt->start4);
 177                         info->size  = le32_to_int (pt->size4);
 178                         switch(dev_desc->if_type) {
 179                                 case IF_TYPE_IDE:
 180                                 case IF_TYPE_ATAPI:
 181                                         sprintf (info->name, "hd%c%d\n", 'a' + dev_desc->dev, part_num);
 182                                         break;
 183                                 case IF_TYPE_SCSI:
 184                                         sprintf (info->name, "sd%c%d\n", 'a' + dev_desc->dev, part_num);
 185                                         break;
 186                                 case IF_TYPE_USB:
 187                                         sprintf (info->name, "usbd%c%d\n", 'a' + dev_desc->dev, part_num);
 188                                         break;
 189                                 case IF_TYPE_DOC:
 190                                         sprintf (info->name, "docd%c%d\n", 'a' + dev_desc->dev, part_num);
 191                                         break;
 192                                 default:
 193                                         sprintf (info->name, "xx%c%d\n", 'a' + dev_desc->dev, part_num);
 194                                         break;
 195                         }
 196                         /* sprintf(info->type, "%d, pt->sys_ind); */
 197                         sprintf (info->type, "U-Boot");
 198                         return 0;
 199                 }
 200
 201                 /* Reverse engr the fdisk part# assignment rule! */
 202                 if ((ext_part_sector == 0) ||
 203                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 204                         part_num++;
 205                 }
 206         }
 207
 208         /* Follows the extended partitions */
 209         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 210         for (i = 0; i < 4; i++, pt++) {
 211                 if (is_extended (pt->sys_ind)) {
 212                         int lba_start = le32_to_int (pt->start4) + relative;
 213
 214                         return get_partition_info_extended (dev_desc, lba_start,
 215                                  ext_part_sector == 0 ? lba_start : relative,
 216                                  part_num, which_part, info);
 217                 }
 218         }
 219         return -1;
 220 }
 221
 222 void print_part_dos (block_dev_desc_t *dev_desc)
 223 {
 224         printf ("Partition     Start Sector     Num Sectors     Type\n");
 225         print_partition_extended (dev_desc, 0, 0, 1);
 226 }
 227
 228 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 229 {
 230         return get_partition_info_extended (dev_desc, 0, 0, 1, part, info);
 231 }
 232
 233
 234 #endif  /* (CONFIG_COMMANDS & CFG_CMD_IDE) && CONFIG_DOS_PARTITION */