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_SATA) || \
  40      defined(CONFIG_CMD_SCSI) || \
  41      defined(CONFIG_CMD_USB) || \
  42      defined(CONFIG_MMC) || \
  43      defined(CONFIG_SYSTEMACE) ) && defined(CONFIG_DOS_PARTITION)
  44
  45 /* Convert char[4] in little endian format to the host format integer
  46  */
  47 static inline int le32_to_int(unsigned char *le32)
  48 {
  49     return ((le32[3] << 24) +
  50             (le32[2] << 16) +
  51             (le32[1] << 8) +
  52              le32[0]
  53            );
  54 }
  55
  56 static inline int is_extended(int part_type)
  57 {
  58     return (part_type == 0x5 ||
  59             part_type == 0xf ||
  60             part_type == 0x85);
  61 }
  62
  63 static void print_one_part (dos_partition_t *p, int ext_part_sector, int part_num)
  64 {
  65         int lba_start = ext_part_sector + le32_to_int (p->start4);
  66         int lba_size  = le32_to_int (p->size4);
  67
  68         printf ("%5d\t\t%10d\t%10d\t%2x%s\n",
  69                 part_num, lba_start, lba_size, p->sys_ind,
  70                 (is_extended (p->sys_ind) ? " Extd" : ""));
  71 }
  72
  73 static int test_block_type(unsigned char *buffer)
  74 {
  75         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  76             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  77                 return (-1);
  78         } /* no DOS Signature at all */
  79         if(strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],"FAT",3)==0)
  80                 return DOS_PBR; /* is PBR */
  81         return DOS_MBR;     /* Is MBR */
  82 }
  83
  84
  85 int test_part_dos (block_dev_desc_t *dev_desc)
  86 {
  87         unsigned char buffer[DEFAULT_SECTOR_SIZE];
  88
  89         if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1) ||
  90             (buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  91             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  92                 return (-1);
  93         }
  94         return (0);
  95 }
  96
  97 /*  Print a partition that is relative to its Extended partition table
  98  */
  99 static void print_partition_extended (block_dev_desc_t *dev_desc, int ext_part_sector, int relative,
 100                                                            int part_num)
 101 {
 102         unsigned char buffer[DEFAULT_SECTOR_SIZE];
 103         dos_partition_t *pt;
 104         int i;
 105
 106         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 107                 printf ("** Can't read partition table on %d:%d **\n",
 108                         dev_desc->dev, ext_part_sector);
 109                 return;
 110         }
 111         i=test_block_type(buffer);
 112         if(i==-1) {
 113                 printf ("bad MBR sector signature 0x%02x%02x\n",
 114                         buffer[DOS_PART_MAGIC_OFFSET],
 115                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 116                 return;
 117         }
 118         if(i==DOS_PBR) {
 119                 printf ("    1\t\t         0\t%10ld\t%2x\n",
 120                         dev_desc->lba, buffer[DOS_PBR_MEDIA_TYPE_OFFSET]);
 121                 return;
 122         }
 123         /* Print all primary/logical partitions */
 124         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 125         for (i = 0; i < 4; i++, pt++) {
 126                 /*
 127                  * fdisk does not show the extended partitions that
 128                  * are not in the MBR
 129                  */
 130
 131                 if ((pt->sys_ind != 0) &&
 132                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 133                         print_one_part (pt, ext_part_sector, part_num);
 134                 }
 135
 136                 /* Reverse engr the fdisk part# assignment rule! */
 137                 if ((ext_part_sector == 0) ||
 138                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 139                         part_num++;
 140                 }
 141         }
 142
 143         /* Follows the extended partitions */
 144         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 145         for (i = 0; i < 4; i++, pt++) {
 146                 if (is_extended (pt->sys_ind)) {
 147                         int lba_start = le32_to_int (pt->start4) + relative;
 148
 149                         print_partition_extended (dev_desc, lba_start,
 150                                                   ext_part_sector == 0  ? lba_start
 151                                                                         : relative,
 152                                                   part_num);
 153                 }
 154         }
 155
 156         return;
 157 }
 158
 159
 160 /*  Print a partition that is relative to its Extended partition table
 161  */
 162 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
 163                                  int relative, int part_num,
 164                                  int which_part, disk_partition_t *info)
 165 {
 166         unsigned char buffer[DEFAULT_SECTOR_SIZE];
 167         dos_partition_t *pt;
 168         int i;
 169
 170         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 171                 printf ("** Can't read partition table on %d:%d **\n",
 172                         dev_desc->dev, ext_part_sector);
 173                 return -1;
 174         }
 175         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 176                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 177                 printf ("bad MBR sector signature 0x%02x%02x\n",
 178                         buffer[DOS_PART_MAGIC_OFFSET],
 179                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 180                 return -1;
 181         }
 182
 183         /* Print all primary/logical partitions */
 184         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 185         for (i = 0; i < 4; i++, pt++) {
 186                 /*
 187                  * fdisk does not show the extended partitions that
 188                  * are not in the MBR
 189                  */
 190                 if ((pt->sys_ind != 0) &&
 191                     (part_num == which_part) &&
 192                     (is_extended(pt->sys_ind) == 0)) {
 193                         info->blksz = 512;
 194                         info->start = ext_part_sector + le32_to_int (pt->start4);
 195                         info->size  = le32_to_int (pt->size4);
 196                         switch(dev_desc->if_type) {
 197                                 case IF_TYPE_IDE:
 198                                 case IF_TYPE_SATA:
 199                                 case IF_TYPE_ATAPI:
 200                                         sprintf ((char *)info->name, "hd%c%d\n", 'a' + dev_desc->dev, part_num);
 201                                         break;
 202                                 case IF_TYPE_SCSI:
 203                                         sprintf ((char *)info->name, "sd%c%d\n", 'a' + dev_desc->dev, part_num);
 204                                         break;
 205                                 case IF_TYPE_USB:
 206                                         sprintf ((char *)info->name, "usbd%c%d\n", 'a' + dev_desc->dev, part_num);
 207                                         break;
 208                                 case IF_TYPE_DOC:
 209                                         sprintf ((char *)info->name, "docd%c%d\n", 'a' + dev_desc->dev, part_num);
 210                                         break;
 211                                 default:
 212                                         sprintf ((char *)info->name, "xx%c%d\n", 'a' + dev_desc->dev, part_num);
 213                                         break;
 214                         }
 215                         /* sprintf(info->type, "%d, pt->sys_ind); */
 216                         sprintf ((char *)info->type, "U-Boot");
 217                         return 0;
 218                 }
 219
 220                 /* Reverse engr the fdisk part# assignment rule! */
 221                 if ((ext_part_sector == 0) ||
 222                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 223                         part_num++;
 224                 }
 225         }
 226
 227         /* Follows the extended partitions */
 228         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 229         for (i = 0; i < 4; i++, pt++) {
 230                 if (is_extended (pt->sys_ind)) {
 231                         int lba_start = le32_to_int (pt->start4) + relative;
 232
 233                         return get_partition_info_extended (dev_desc, lba_start,
 234                                  ext_part_sector == 0 ? lba_start : relative,
 235                                  part_num, which_part, info);
 236                 }
 237         }
 238         return -1;
 239 }
 240
 241 void print_part_dos (block_dev_desc_t *dev_desc)
 242 {
 243         printf ("Partition     Start Sector     Num Sectors     Type\n");
 244         print_partition_extended (dev_desc, 0, 0, 1);
 245 }
 246
 247 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 248 {
 249         return get_partition_info_extended (dev_desc, 0, 0, 1, part, info);
 250 }
 251
 252
 253 #endif