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 <cmd_disk.h>
  37 #include "part_dos.h"
  38
  39 #if ((CONFIG_COMMANDS & CFG_CMD_IDE) || (CONFIG_COMMANDS & CFG_CMD_SCSI)) && defined(CONFIG_DOS_PARTITION)
  40
  41 /* Convert char[4] in little endian format to the host format integer
  42  */
  43 static inline int le32_to_int(unsigned char *le32)
  44 {
  45     return ((le32[3] << 24) +
  46             (le32[2] << 16) +
  47             (le32[1] << 8) +
  48              le32[0]
  49            );
  50 }
  51
  52 static inline int is_extended(int part_type)
  53 {
  54     return (part_type == 0x5 ||
  55             part_type == 0xf ||
  56             part_type == 0x85);
  57 }
  58
  59 static void print_one_part (dos_partition_t *p, int ext_part_sector, int part_num)
  60 {
  61         int lba_start = ext_part_sector + le32_to_int (p->start4);
  62         int lba_size  = le32_to_int (p->size4);
  63
  64         printf ("%5d\t\t%10d\t%10d\t%2x%s\n",
  65                 part_num, lba_start, lba_size, p->sys_ind,
  66                 (is_extended (p->sys_ind) ? " Extd" : ""));
  67 }
  68
  69
  70 int test_part_dos (block_dev_desc_t *dev_desc)
  71 {
  72         unsigned char buffer[DEFAULT_SECTOR_SIZE];
  73
  74         if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1) ||
  75             (buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  76             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  77                 return (-1);
  78         }
  79         return (0);
  80 }
  81
  82 /*  Print a partition that is relative to its Extended partition table
  83  */
  84 static void print_partition_extended (block_dev_desc_t *dev_desc, int ext_part_sector, int relative,
  85                                                            int part_num)
  86 {
  87         unsigned char buffer[DEFAULT_SECTOR_SIZE];
  88         dos_partition_t *pt;
  89         int i;
  90
  91         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
  92                 printf ("** Can't read partition table on %d:%d **\n",
  93                         dev_desc->dev, ext_part_sector);
  94                 return;
  95         }
  96         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
  97                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
  98                 printf ("bad MBR sector signature 0x%02x%02x\n",
  99                         buffer[DOS_PART_MAGIC_OFFSET],
 100                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 101                 return;
 102         }
 103
 104         /* Print all primary/logical partitions */
 105         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 106         for (i = 0; i < 4; i++, pt++) {
 107                 /*
 108                  * fdisk does not show the extended partitions that
 109                  * are not in the MBR
 110                  */
 111
 112                 if ((pt->sys_ind != 0) &&
 113                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 114                         print_one_part (pt, ext_part_sector, part_num);
 115                 }
 116
 117                 /* Reverse engr the fdisk part# assignment rule! */
 118                 if ((ext_part_sector == 0) ||
 119                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 120                         part_num++;
 121                 }
 122         }
 123
 124         /* Follows the extended partitions */
 125         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 126         for (i = 0; i < 4; i++, pt++) {
 127                 if (is_extended (pt->sys_ind)) {
 128                         int lba_start = le32_to_int (pt->start4) + relative;
 129
 130                         print_partition_extended (dev_desc, lba_start,
 131                                                   ext_part_sector == 0  ? lba_start
 132                                                                         : relative,
 133                                                   part_num);
 134                 }
 135         }
 136
 137         return;
 138 }
 139
 140
 141 /*  Print a partition that is relative to its Extended partition table
 142  */
 143 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
 144                                  int relative, int part_num,
 145                                  int which_part, disk_partition_t *info)
 146 {
 147         unsigned char buffer[DEFAULT_SECTOR_SIZE];
 148         dos_partition_t *pt;
 149         int i;
 150
 151         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 152                 printf ("** Can't read partition table on %d:%d **\n",
 153                         dev_desc->dev, ext_part_sector);
 154                 return -1;
 155         }
 156         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 157                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 158                 printf ("bad MBR sector signature 0x%02x%02x\n",
 159                         buffer[DOS_PART_MAGIC_OFFSET],
 160                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 161                 return -1;
 162         }
 163
 164         /* Print all primary/logical partitions */
 165         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 166         for (i = 0; i < 4; i++, pt++) {
 167                 /*
 168                  * fdisk does not show the extended partitions that
 169                  * are not in the MBR
 170                  */
 171                 if ((pt->sys_ind != 0) &&
 172                     (part_num == which_part) &&
 173                     (is_extended(pt->sys_ind) == 0)) {
 174                         info->blksz = 512;
 175                         info->start = ext_part_sector + le32_to_int (pt->start4);
 176                         info->size  = le32_to_int (pt->size4);
 177                         switch(dev_desc->if_type) {
 178                                 case IF_TYPE_IDE:
 179                                 case IF_TYPE_ATAPI:
 180                                         sprintf (info->name, "hd%c%d\n", 'a' + dev_desc->dev, part_num);
 181                                         break;
 182                                 case IF_TYPE_SCSI:
 183                                         sprintf (info->name, "sd%c%d\n", 'a' + dev_desc->dev, part_num);
 184                                         break;
 185                                 case IF_TYPE_USB:
 186                                         sprintf (info->name, "usbd%c%d\n", 'a' + dev_desc->dev, part_num);
 187                                         break;
 188                                 case IF_TYPE_DOC:
 189                                         sprintf (info->name, "docd%c%d\n", 'a' + dev_desc->dev, part_num);
 190                                         break;
 191                                 default:
 192                                         sprintf (info->name, "xx%c%d\n", 'a' + dev_desc->dev, part_num);
 193                                         break;
 194                         }
 195                         /* sprintf(info->type, "%d, pt->sys_ind); */
 196                         sprintf (info->type, "U-Boot");
 197                         return 0;
 198                 }
 199
 200                 /* Reverse engr the fdisk part# assignment rule! */
 201                 if ((ext_part_sector == 0) ||
 202                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 203                         part_num++;
 204                 }
 205         }
 206
 207         /* Follows the extended partitions */
 208         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 209         for (i = 0; i < 4; i++, pt++) {
 210                 if (is_extended (pt->sys_ind)) {
 211                         int lba_start = le32_to_int (pt->start4) + relative;
 212
 213                         return get_partition_info_extended (dev_desc, lba_start,
 214                                  ext_part_sector == 0 ? lba_start : relative,
 215                                  part_num, which_part, info);
 216                 }
 217         }
 218         return -1;
 219 }
 220
 221 void print_part_dos (block_dev_desc_t *dev_desc)
 222 {
 223         printf ("Partition     Start Sector     Num Sectors     Type\n");
 224         print_partition_extended (dev_desc, 0, 0, 1);
 225 }
 226
 227 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 228 {
 229         return get_partition_info_extended (dev_desc, 0, 0, 1, part, info);
 230 }
 231
 232
 233 #endif  /* (CONFIG_COMMANDS & CFG_CMD_IDE) && CONFIG_DOS_PARTITION */