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 #ifdef HAVE_BLOCK_DEVICE
  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 inline int is_bootable(dos_partition_t *p)
  59 {
  60         return p->boot_ind == 0x80;
  61 }
  62
  63 static void print_one_part(dos_partition_t *p, int ext_part_sector,
  64                            int part_num, unsigned int disksig)
  65 {
  66         int lba_start = ext_part_sector + le32_to_int (p->start4);
  67         int lba_size  = le32_to_int (p->size4);
  68
  69         printf("%3d\t%-10d\t%-10d\t%08x-%02x\t%02x%s%s\n",
  70                 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
  71                 (is_extended(p->sys_ind) ? " Extd" : ""),
  72                 (is_bootable(p) ? " Boot" : ""));
  73 }
  74
  75 static int test_block_type(unsigned char *buffer)
  76 {
  77         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  78             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  79                 return (-1);
  80         } /* no DOS Signature at all */
  81         if (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],"FAT",3)==0 ||
  82             strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],"FAT32",5)==0) {
  83                 return DOS_PBR; /* is PBR */
  84         }
  85         return DOS_MBR;     /* Is MBR */
  86 }
  87
  88
  89 int test_part_dos (block_dev_desc_t *dev_desc)
  90 {
  91         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
  92
  93         if (dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1)
  94                 return -1;
  95
  96         if (test_block_type(buffer) != DOS_MBR)
  97                 return -1;
  98
  99         return 0;
 100 }
 101
 102 /*  Print a partition that is relative to its Extended partition table
 103  */
 104 static void print_partition_extended(block_dev_desc_t *dev_desc,
 105                                      int ext_part_sector, int relative,
 106                                      int part_num, unsigned int disksig)
 107 {
 108         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 109         dos_partition_t *pt;
 110         int i;
 111
 112         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 113                 printf ("** Can't read partition table on %d:%d **\n",
 114                         dev_desc->dev, ext_part_sector);
 115                 return;
 116         }
 117         i=test_block_type(buffer);
 118         if (i != DOS_MBR) {
 119                 printf ("bad MBR sector signature 0x%02x%02x\n",
 120                         buffer[DOS_PART_MAGIC_OFFSET],
 121                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 122                 return;
 123         }
 124
 125         if (!ext_part_sector)
 126                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 127
 128         /* Print all primary/logical partitions */
 129         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 130         for (i = 0; i < 4; i++, pt++) {
 131                 /*
 132                  * fdisk does not show the extended partitions that
 133                  * are not in the MBR
 134                  */
 135
 136                 if ((pt->sys_ind != 0) &&
 137                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 138                         print_one_part(pt, ext_part_sector, part_num, disksig);
 139                 }
 140
 141                 /* Reverse engr the fdisk part# assignment rule! */
 142                 if ((ext_part_sector == 0) ||
 143                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 144                         part_num++;
 145                 }
 146         }
 147
 148         /* Follows the extended partitions */
 149         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 150         for (i = 0; i < 4; i++, pt++) {
 151                 if (is_extended (pt->sys_ind)) {
 152                         int lba_start = le32_to_int (pt->start4) + relative;
 153
 154                         print_partition_extended(dev_desc, lba_start,
 155                                 ext_part_sector == 0  ? lba_start : relative,
 156                                 part_num, disksig);
 157                 }
 158         }
 159
 160         return;
 161 }
 162
 163
 164 /*  Print a partition that is relative to its Extended partition table
 165  */
 166 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
 167                                  int relative, int part_num,
 168                                  int which_part, disk_partition_t *info,
 169                                  unsigned int disksig)
 170 {
 171         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 172         dos_partition_t *pt;
 173         int i;
 174
 175         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 176                 printf ("** Can't read partition table on %d:%d **\n",
 177                         dev_desc->dev, ext_part_sector);
 178                 return -1;
 179         }
 180         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 181                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 182                 printf ("bad MBR sector signature 0x%02x%02x\n",
 183                         buffer[DOS_PART_MAGIC_OFFSET],
 184                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 185                 return -1;
 186         }
 187
 188 #ifdef CONFIG_PARTITION_UUIDS
 189         if (!ext_part_sector)
 190                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 191 #endif
 192
 193         /* Print all primary/logical partitions */
 194         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 195         for (i = 0; i < 4; i++, pt++) {
 196                 /*
 197                  * fdisk does not show the extended partitions that
 198                  * are not in the MBR
 199                  */
 200                 if (((pt->boot_ind & ~0x80) == 0) &&
 201                     (pt->sys_ind != 0) &&
 202                     (part_num == which_part) &&
 203                     (is_extended(pt->sys_ind) == 0)) {
 204                         info->blksz = 512;
 205                         info->start = ext_part_sector + le32_to_int (pt->start4);
 206                         info->size  = le32_to_int (pt->size4);
 207                         switch(dev_desc->if_type) {
 208                                 case IF_TYPE_IDE:
 209                                 case IF_TYPE_SATA:
 210                                 case IF_TYPE_ATAPI:
 211                                         sprintf ((char *)info->name, "hd%c%d",
 212                                                 'a' + dev_desc->dev, part_num);
 213                                         break;
 214                                 case IF_TYPE_SCSI:
 215                                         sprintf ((char *)info->name, "sd%c%d",
 216                                                 'a' + dev_desc->dev, part_num);
 217                                         break;
 218                                 case IF_TYPE_USB:
 219                                         sprintf ((char *)info->name, "usbd%c%d",
 220                                                 'a' + dev_desc->dev, part_num);
 221                                         break;
 222                                 case IF_TYPE_DOC:
 223                                         sprintf ((char *)info->name, "docd%c%d",
 224                                                 'a' + dev_desc->dev, part_num);
 225                                         break;
 226                                 default:
 227                                         sprintf ((char *)info->name, "xx%c%d",
 228                                                 'a' + dev_desc->dev, part_num);
 229                                         break;
 230                         }
 231                         /* sprintf(info->type, "%d, pt->sys_ind); */
 232                         sprintf ((char *)info->type, "U-Boot");
 233                         info->bootable = is_bootable(pt);
 234 #ifdef CONFIG_PARTITION_UUIDS
 235                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 236 #endif
 237                         return 0;
 238                 }
 239
 240                 /* Reverse engr the fdisk part# assignment rule! */
 241                 if ((ext_part_sector == 0) ||
 242                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 243                         part_num++;
 244                 }
 245         }
 246
 247         /* Follows the extended partitions */
 248         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 249         for (i = 0; i < 4; i++, pt++) {
 250                 if (is_extended (pt->sys_ind)) {
 251                         int lba_start = le32_to_int (pt->start4) + relative;
 252
 253                         return get_partition_info_extended (dev_desc, lba_start,
 254                                  ext_part_sector == 0 ? lba_start : relative,
 255                                  part_num, which_part, info, disksig);
 256                 }
 257         }
 258         return -1;
 259 }
 260
 261 void print_part_dos (block_dev_desc_t *dev_desc)
 262 {
 263         printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
 264         print_partition_extended(dev_desc, 0, 0, 1, 0);
 265 }
 266
 267 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 268 {
 269         return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 270 }
 271
 272
 273 #endif