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         int slot;
  78         struct dos_partition *p;
  79
  80         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  81             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  82                 return (-1);
  83         } /* no DOS Signature at all */
  84         p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
  85         for (slot = 0; slot < 3; slot++) {
  86                 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
  87                         if (!slot &&
  88                             (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
  89                                      "FAT", 3) == 0 ||
  90                              strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
  91                                      "FAT32", 5) == 0)) {
  92                                 return DOS_PBR; /* is PBR */
  93                         } else {
  94                                 return -1;
  95                         }
  96                 }
  97         }
  98         return DOS_MBR;     /* Is MBR */
  99 }
 100
 101
 102 int test_part_dos (block_dev_desc_t *dev_desc)
 103 {
 104         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 105
 106         if (dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1)
 107                 return -1;
 108
 109         if (test_block_type(buffer) != DOS_MBR)
 110                 return -1;
 111
 112         return 0;
 113 }
 114
 115 /*  Print a partition that is relative to its Extended partition table
 116  */
 117 static void print_partition_extended(block_dev_desc_t *dev_desc,
 118                                      int ext_part_sector, int relative,
 119                                      int part_num, unsigned int disksig)
 120 {
 121         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 122         dos_partition_t *pt;
 123         int i;
 124
 125         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 126                 printf ("** Can't read partition table on %d:%d **\n",
 127                         dev_desc->dev, ext_part_sector);
 128                 return;
 129         }
 130         i=test_block_type(buffer);
 131         if (i != DOS_MBR) {
 132                 printf ("bad MBR sector signature 0x%02x%02x\n",
 133                         buffer[DOS_PART_MAGIC_OFFSET],
 134                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 135                 return;
 136         }
 137
 138         if (!ext_part_sector)
 139                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 140
 141         /* Print all primary/logical partitions */
 142         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 143         for (i = 0; i < 4; i++, pt++) {
 144                 /*
 145                  * fdisk does not show the extended partitions that
 146                  * are not in the MBR
 147                  */
 148
 149                 if ((pt->sys_ind != 0) &&
 150                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 151                         print_one_part(pt, ext_part_sector, part_num, disksig);
 152                 }
 153
 154                 /* Reverse engr the fdisk part# assignment rule! */
 155                 if ((ext_part_sector == 0) ||
 156                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 157                         part_num++;
 158                 }
 159         }
 160
 161         /* Follows the extended partitions */
 162         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 163         for (i = 0; i < 4; i++, pt++) {
 164                 if (is_extended (pt->sys_ind)) {
 165                         int lba_start = le32_to_int (pt->start4) + relative;
 166
 167                         print_partition_extended(dev_desc, lba_start,
 168                                 ext_part_sector == 0  ? lba_start : relative,
 169                                 part_num, disksig);
 170                 }
 171         }
 172
 173         return;
 174 }
 175
 176
 177 /*  Print a partition that is relative to its Extended partition table
 178  */
 179 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
 180                                  int relative, int part_num,
 181                                  int which_part, disk_partition_t *info,
 182                                  unsigned int disksig)
 183 {
 184         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 185         dos_partition_t *pt;
 186         int i;
 187
 188         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 189                 printf ("** Can't read partition table on %d:%d **\n",
 190                         dev_desc->dev, ext_part_sector);
 191                 return -1;
 192         }
 193         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 194                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 195                 printf ("bad MBR sector signature 0x%02x%02x\n",
 196                         buffer[DOS_PART_MAGIC_OFFSET],
 197                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 198                 return -1;
 199         }
 200
 201 #ifdef CONFIG_PARTITION_UUIDS
 202         if (!ext_part_sector)
 203                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 204 #endif
 205
 206         /* Print all primary/logical partitions */
 207         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 208         for (i = 0; i < 4; i++, pt++) {
 209                 /*
 210                  * fdisk does not show the extended partitions that
 211                  * are not in the MBR
 212                  */
 213                 if (((pt->boot_ind & ~0x80) == 0) &&
 214                     (pt->sys_ind != 0) &&
 215                     (part_num == which_part) &&
 216                     (is_extended(pt->sys_ind) == 0)) {
 217                         info->blksz = 512;
 218                         info->start = ext_part_sector + le32_to_int (pt->start4);
 219                         info->size  = le32_to_int (pt->size4);
 220                         switch(dev_desc->if_type) {
 221                                 case IF_TYPE_IDE:
 222                                 case IF_TYPE_SATA:
 223                                 case IF_TYPE_ATAPI:
 224                                         sprintf ((char *)info->name, "hd%c%d",
 225                                                 'a' + dev_desc->dev, part_num);
 226                                         break;
 227                                 case IF_TYPE_SCSI:
 228                                         sprintf ((char *)info->name, "sd%c%d",
 229                                                 'a' + dev_desc->dev, part_num);
 230                                         break;
 231                                 case IF_TYPE_USB:
 232                                         sprintf ((char *)info->name, "usbd%c%d",
 233                                                 'a' + dev_desc->dev, part_num);
 234                                         break;
 235                                 case IF_TYPE_DOC:
 236                                         sprintf ((char *)info->name, "docd%c%d",
 237                                                 'a' + dev_desc->dev, part_num);
 238                                         break;
 239                                 default:
 240                                         sprintf ((char *)info->name, "xx%c%d",
 241                                                 'a' + dev_desc->dev, part_num);
 242                                         break;
 243                         }
 244                         /* sprintf(info->type, "%d, pt->sys_ind); */
 245                         sprintf ((char *)info->type, "U-Boot");
 246                         info->bootable = is_bootable(pt);
 247 #ifdef CONFIG_PARTITION_UUIDS
 248                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 249 #endif
 250                         return 0;
 251                 }
 252
 253                 /* Reverse engr the fdisk part# assignment rule! */
 254                 if ((ext_part_sector == 0) ||
 255                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 256                         part_num++;
 257                 }
 258         }
 259
 260         /* Follows the extended partitions */
 261         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 262         for (i = 0; i < 4; i++, pt++) {
 263                 if (is_extended (pt->sys_ind)) {
 264                         int lba_start = le32_to_int (pt->start4) + relative;
 265
 266                         return get_partition_info_extended (dev_desc, lba_start,
 267                                  ext_part_sector == 0 ? lba_start : relative,
 268                                  part_num, which_part, info, disksig);
 269                 }
 270         }
 271         return -1;
 272 }
 273
 274 void print_part_dos (block_dev_desc_t *dev_desc)
 275 {
 276         printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
 277         print_partition_extended(dev_desc, 0, 0, 1, 0);
 278 }
 279
 280 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 281 {
 282         return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 283 }
 284
 285
 286 #endif