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, int part_num)
  69 {
  70         int lba_start = ext_part_sector + le32_to_int (p->start4);
  71         int lba_size  = le32_to_int (p->size4);
  72
  73         printf("%5d\t\t%10d\t%10d\t%2x%s%s\n",
  74                 part_num, lba_start, lba_size, p->sys_ind,
  75                 (is_extended(p->sys_ind) ? " Extd" : ""),
  76                 (is_bootable(p) ? " Boot" : ""));
  77 }
  78
  79 static int test_block_type(unsigned char *buffer)
  80 {
  81         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  82             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  83                 return (-1);
  84         } /* no DOS Signature at all */
  85         if (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],"FAT",3)==0 ||
  86             strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],"FAT32",5)==0) {
  87                 return DOS_PBR; /* is PBR */
  88         }
  89         return DOS_MBR;     /* Is MBR */
  90 }
  91
  92
  93 int test_part_dos (block_dev_desc_t *dev_desc)
  94 {
  95         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
  96
  97         if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1) ||
  98             (buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  99             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
 100                 return (-1);
 101         }
 102         return (0);
 103 }
 104
 105 /*  Print a partition that is relative to its Extended partition table
 106  */
 107 static void print_partition_extended (block_dev_desc_t *dev_desc, int ext_part_sector, int relative,
 108                                                            int part_num)
 109 {
 110         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 111         dos_partition_t *pt;
 112         int i;
 113
 114         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 115                 printf ("** Can't read partition table on %d:%d **\n",
 116                         dev_desc->dev, ext_part_sector);
 117                 return;
 118         }
 119         i=test_block_type(buffer);
 120         if(i==-1) {
 121                 printf ("bad MBR sector signature 0x%02x%02x\n",
 122                         buffer[DOS_PART_MAGIC_OFFSET],
 123                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 124                 return;
 125         }
 126         if(i==DOS_PBR) {
 127                 printf ("    1\t\t         0\t%10ld\t%2x\n",
 128                         dev_desc->lba, buffer[DOS_PBR_MEDIA_TYPE_OFFSET]);
 129                 return;
 130         }
 131         /* Print all primary/logical partitions */
 132         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 133         for (i = 0; i < 4; i++, pt++) {
 134                 /*
 135                  * fdisk does not show the extended partitions that
 136                  * are not in the MBR
 137                  */
 138
 139                 if ((pt->sys_ind != 0) &&
 140                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 141                         print_one_part (pt, ext_part_sector, part_num);
 142                 }
 143
 144                 /* Reverse engr the fdisk part# assignment rule! */
 145                 if ((ext_part_sector == 0) ||
 146                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 147                         part_num++;
 148                 }
 149         }
 150
 151         /* Follows the extended partitions */
 152         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 153         for (i = 0; i < 4; i++, pt++) {
 154                 if (is_extended (pt->sys_ind)) {
 155                         int lba_start = le32_to_int (pt->start4) + relative;
 156
 157                         print_partition_extended (dev_desc, lba_start,
 158                                                   ext_part_sector == 0  ? lba_start
 159                                                                         : relative,
 160                                                   part_num);
 161                 }
 162         }
 163
 164         return;
 165 }
 166
 167
 168 /*  Print a partition that is relative to its Extended partition table
 169  */
 170 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
 171                                  int relative, int part_num,
 172                                  int which_part, disk_partition_t *info,
 173                                  unsigned int disksig)
 174 {
 175         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 176         dos_partition_t *pt;
 177         int i;
 178
 179         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 180                 printf ("** Can't read partition table on %d:%d **\n",
 181                         dev_desc->dev, ext_part_sector);
 182                 return -1;
 183         }
 184         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 185                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 186                 printf ("bad MBR sector signature 0x%02x%02x\n",
 187                         buffer[DOS_PART_MAGIC_OFFSET],
 188                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 189                 return -1;
 190         }
 191
 192 #ifdef CONFIG_PARTITION_UUIDS
 193         if (!ext_part_sector)
 194                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 195 #endif
 196
 197         /* Print all primary/logical partitions */
 198         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 199         for (i = 0; i < 4; i++, pt++) {
 200                 /*
 201                  * fdisk does not show the extended partitions that
 202                  * are not in the MBR
 203                  */
 204                 if (((pt->boot_ind & ~0x80) == 0) &&
 205                     (pt->sys_ind != 0) &&
 206                     (part_num == which_part) &&
 207                     (is_extended(pt->sys_ind) == 0)) {
 208                         info->blksz = 512;
 209                         info->start = ext_part_sector + le32_to_int (pt->start4);
 210                         info->size  = le32_to_int (pt->size4);
 211                         switch(dev_desc->if_type) {
 212                                 case IF_TYPE_IDE:
 213                                 case IF_TYPE_SATA:
 214                                 case IF_TYPE_ATAPI:
 215                                         sprintf ((char *)info->name, "hd%c%d",
 216                                                 'a' + dev_desc->dev, part_num);
 217                                         break;
 218                                 case IF_TYPE_SCSI:
 219                                         sprintf ((char *)info->name, "sd%c%d",
 220                                                 'a' + dev_desc->dev, part_num);
 221                                         break;
 222                                 case IF_TYPE_USB:
 223                                         sprintf ((char *)info->name, "usbd%c%d",
 224                                                 'a' + dev_desc->dev, part_num);
 225                                         break;
 226                                 case IF_TYPE_DOC:
 227                                         sprintf ((char *)info->name, "docd%c%d",
 228                                                 'a' + dev_desc->dev, part_num);
 229                                         break;
 230                                 default:
 231                                         sprintf ((char *)info->name, "xx%c%d",
 232                                                 'a' + dev_desc->dev, part_num);
 233                                         break;
 234                         }
 235                         /* sprintf(info->type, "%d, pt->sys_ind); */
 236                         sprintf ((char *)info->type, "U-Boot");
 237                         info->bootable = is_bootable(pt);
 238 #ifdef CONFIG_PARTITION_UUIDS
 239                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 240 #endif
 241                         return 0;
 242                 }
 243
 244                 /* Reverse engr the fdisk part# assignment rule! */
 245                 if ((ext_part_sector == 0) ||
 246                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 247                         part_num++;
 248                 }
 249         }
 250
 251         /* Follows the extended partitions */
 252         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 253         for (i = 0; i < 4; i++, pt++) {
 254                 if (is_extended (pt->sys_ind)) {
 255                         int lba_start = le32_to_int (pt->start4) + relative;
 256
 257                         return get_partition_info_extended (dev_desc, lba_start,
 258                                  ext_part_sector == 0 ? lba_start : relative,
 259                                  part_num, which_part, info, disksig);
 260                 }
 261         }
 262         return -1;
 263 }
 264
 265 void print_part_dos (block_dev_desc_t *dev_desc)
 266 {
 267         printf ("Partition     Start Sector     Num Sectors     Type\n");
 268         print_partition_extended (dev_desc, 0, 0, 1);
 269 }
 270
 271 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 272 {
 273         return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 274 }
 275
 276
 277 #endif