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