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)
  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 inline int is_bootable(dos_partition_t *p)
  64 {
  65         return p->boot_ind == 0x80;
  66 }
  67
  68 static void print_one_part(dos_partition_t *p, int ext_part_sector,
  69                            int part_num)
  70 {
  71         int lba_start = ext_part_sector + le32_to_int (p->start4);
  72         int lba_size  = le32_to_int (p->size4);
  73
  74         printf("%5d\t\t%10d\t%10d\t%2x%s%s\n",
  75                 part_num, lba_start, lba_size, p->sys_ind,
  76                 (is_extended(p->sys_ind) ? " Extd" : ""),
  77                 (is_bootable(p) ? " Boot" : ""));
  78 }
  79
  80 static int test_block_type(unsigned char *buffer)
  81 {
  82         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  83             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  84                 return (-1);
  85         } /* no DOS Signature at all */
  86         if (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],"FAT",3)==0 ||
  87             strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],"FAT32",5)==0) {
  88                 return DOS_PBR; /* is PBR */
  89         }
  90         return DOS_MBR;     /* Is MBR */
  91 }
  92
  93
  94 int test_part_dos (block_dev_desc_t *dev_desc)
  95 {
  96         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
  97
  98         if (dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1)
  99                 return -1;
 100
 101         if (test_block_type(buffer) != DOS_MBR)
 102                 return -1;
 103
 104         return 0;
 105 }
 106
 107 /*  Print a partition that is relative to its Extended partition table
 108  */
 109 static void print_partition_extended(block_dev_desc_t *dev_desc,
 110                                      int ext_part_sector, int relative,
 111                                      int part_num)
 112 {
 113         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 114         dos_partition_t *pt;
 115         int i;
 116
 117         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 118                 printf ("** Can't read partition table on %d:%d **\n",
 119                         dev_desc->dev, ext_part_sector);
 120                 return;
 121         }
 122         i=test_block_type(buffer);
 123         if (i != DOS_MBR) {
 124                 printf ("bad MBR sector signature 0x%02x%02x\n",
 125                         buffer[DOS_PART_MAGIC_OFFSET],
 126                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 127                 return;
 128         }
 129
 130         /* Print all primary/logical partitions */
 131         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 132         for (i = 0; i < 4; i++, pt++) {
 133                 /*
 134                  * fdisk does not show the extended partitions that
 135                  * are not in the MBR
 136                  */
 137
 138                 if ((pt->sys_ind != 0) &&
 139                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 140                         print_one_part(pt, ext_part_sector, part_num);
 141                 }
 142
 143                 /* Reverse engr the fdisk part# assignment rule! */
 144                 if ((ext_part_sector == 0) ||
 145                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 146                         part_num++;
 147                 }
 148         }
 149
 150         /* Follows the extended partitions */
 151         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 152         for (i = 0; i < 4; i++, pt++) {
 153                 if (is_extended (pt->sys_ind)) {
 154                         int lba_start = le32_to_int (pt->start4) + relative;
 155
 156                         print_partition_extended(dev_desc, lba_start,
 157                                 ext_part_sector == 0  ? lba_start : relative,
 158                                 part_num);
 159                 }
 160         }
 161
 162         return;
 163 }
 164
 165
 166 /*  Print a partition that is relative to its Extended partition table
 167  */
 168 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
 169                                  int relative, int part_num,
 170                                  int which_part, disk_partition_t *info,
 171                                  unsigned int disksig)
 172 {
 173         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 174         dos_partition_t *pt;
 175         int i;
 176
 177         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 178                 printf ("** Can't read partition table on %d:%d **\n",
 179                         dev_desc->dev, ext_part_sector);
 180                 return -1;
 181         }
 182         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 183                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 184                 printf ("bad MBR sector signature 0x%02x%02x\n",
 185                         buffer[DOS_PART_MAGIC_OFFSET],
 186                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 187                 return -1;
 188         }
 189
 190 #ifdef CONFIG_PARTITION_UUIDS
 191         if (!ext_part_sector)
 192                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 193 #endif
 194
 195         /* Print all primary/logical partitions */
 196         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 197         for (i = 0; i < 4; i++, pt++) {
 198                 /*
 199                  * fdisk does not show the extended partitions that
 200                  * are not in the MBR
 201                  */
 202                 if (((pt->boot_ind & ~0x80) == 0) &&
 203                     (pt->sys_ind != 0) &&
 204                     (part_num == which_part) &&
 205                     (is_extended(pt->sys_ind) == 0)) {
 206                         info->blksz = 512;
 207                         info->start = ext_part_sector + le32_to_int (pt->start4);
 208                         info->size  = le32_to_int (pt->size4);
 209                         switch(dev_desc->if_type) {
 210                                 case IF_TYPE_IDE:
 211                                 case IF_TYPE_SATA:
 212                                 case IF_TYPE_ATAPI:
 213                                         sprintf ((char *)info->name, "hd%c%d",
 214                                                 'a' + dev_desc->dev, part_num);
 215                                         break;
 216                                 case IF_TYPE_SCSI:
 217                                         sprintf ((char *)info->name, "sd%c%d",
 218                                                 'a' + dev_desc->dev, part_num);
 219                                         break;
 220                                 case IF_TYPE_USB:
 221                                         sprintf ((char *)info->name, "usbd%c%d",
 222                                                 'a' + dev_desc->dev, part_num);
 223                                         break;
 224                                 case IF_TYPE_DOC:
 225                                         sprintf ((char *)info->name, "docd%c%d",
 226                                                 'a' + dev_desc->dev, part_num);
 227                                         break;
 228                                 default:
 229                                         sprintf ((char *)info->name, "xx%c%d",
 230                                                 'a' + dev_desc->dev, part_num);
 231                                         break;
 232                         }
 233                         /* sprintf(info->type, "%d, pt->sys_ind); */
 234                         sprintf ((char *)info->type, "U-Boot");
 235                         info->bootable = is_bootable(pt);
 236 #ifdef CONFIG_PARTITION_UUIDS
 237                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 238 #endif
 239                         return 0;
 240                 }
 241
 242                 /* Reverse engr the fdisk part# assignment rule! */
 243                 if ((ext_part_sector == 0) ||
 244                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 245                         part_num++;
 246                 }
 247         }
 248
 249         /* Follows the extended partitions */
 250         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 251         for (i = 0; i < 4; i++, pt++) {
 252                 if (is_extended (pt->sys_ind)) {
 253                         int lba_start = le32_to_int (pt->start4) + relative;
 254
 255                         return get_partition_info_extended (dev_desc, lba_start,
 256                                  ext_part_sector == 0 ? lba_start : relative,
 257                                  part_num, which_part, info, disksig);
 258                 }
 259         }
 260         return -1;
 261 }
 262
 263 void print_part_dos (block_dev_desc_t *dev_desc)
 264 {
 265         printf("Partition     Start Sector     Num Sectors     Type\n");
 266         print_partition_extended(dev_desc, 0, 0, 1);
 267 }
 268
 269 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 270 {
 271         return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 272 }
 273
 274
 275 #endif