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 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             strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],"FAT32",5)==0) {
  81                 return DOS_PBR; /* is PBR */
  82         }
  83         return DOS_MBR;     /* Is MBR */
  84 }
  85
  86
  87 int test_part_dos (block_dev_desc_t *dev_desc)
  88 {
  89         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
  90
  91         if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1) ||
  92             (buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  93             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  94                 return (-1);
  95         }
  96         return (0);
  97 }
  98
  99 /*  Print a partition that is relative to its Extended partition table
 100  */
 101 static void print_partition_extended (block_dev_desc_t *dev_desc, int ext_part_sector, int relative,
 102                                                            int part_num)
 103 {
 104         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 105         dos_partition_t *pt;
 106         int i;
 107
 108         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 109                 printf ("** Can't read partition table on %d:%d **\n",
 110                         dev_desc->dev, ext_part_sector);
 111                 return;
 112         }
 113         i=test_block_type(buffer);
 114         if(i==-1) {
 115                 printf ("bad MBR sector signature 0x%02x%02x\n",
 116                         buffer[DOS_PART_MAGIC_OFFSET],
 117                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 118                 return;
 119         }
 120         if(i==DOS_PBR) {
 121                 printf ("    1\t\t         0\t%10ld\t%2x\n",
 122                         dev_desc->lba, buffer[DOS_PBR_MEDIA_TYPE_OFFSET]);
 123                 return;
 124         }
 125         /* Print all primary/logical partitions */
 126         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 127         for (i = 0; i < 4; i++, pt++) {
 128                 /*
 129                  * fdisk does not show the extended partitions that
 130                  * are not in the MBR
 131                  */
 132
 133                 if ((pt->sys_ind != 0) &&
 134                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 135                         print_one_part (pt, ext_part_sector, part_num);
 136                 }
 137
 138                 /* Reverse engr the fdisk part# assignment rule! */
 139                 if ((ext_part_sector == 0) ||
 140                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 141                         part_num++;
 142                 }
 143         }
 144
 145         /* Follows the extended partitions */
 146         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 147         for (i = 0; i < 4; i++, pt++) {
 148                 if (is_extended (pt->sys_ind)) {
 149                         int lba_start = le32_to_int (pt->start4) + relative;
 150
 151                         print_partition_extended (dev_desc, lba_start,
 152                                                   ext_part_sector == 0  ? lba_start
 153                                                                         : relative,
 154                                                   part_num);
 155                 }
 156         }
 157
 158         return;
 159 }
 160
 161
 162 /*  Print a partition that is relative to its Extended partition table
 163  */
 164 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
 165                                  int relative, int part_num,
 166                                  int which_part, disk_partition_t *info)
 167 {
 168         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 169         dos_partition_t *pt;
 170         int i;
 171
 172         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 173                 printf ("** Can't read partition table on %d:%d **\n",
 174                         dev_desc->dev, ext_part_sector);
 175                 return -1;
 176         }
 177         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 178                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 179                 printf ("bad MBR sector signature 0x%02x%02x\n",
 180                         buffer[DOS_PART_MAGIC_OFFSET],
 181                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 182                 return -1;
 183         }
 184
 185         /* Print all primary/logical partitions */
 186         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 187         for (i = 0; i < 4; i++, pt++) {
 188                 /*
 189                  * fdisk does not show the extended partitions that
 190                  * are not in the MBR
 191                  */
 192                 if (((pt->boot_ind & ~0x80) == 0) &&
 193                     (pt->sys_ind != 0) &&
 194                     (part_num == which_part) &&
 195                     (is_extended(pt->sys_ind) == 0)) {
 196                         info->blksz = 512;
 197                         info->start = ext_part_sector + le32_to_int (pt->start4);
 198                         info->size  = le32_to_int (pt->size4);
 199                         switch(dev_desc->if_type) {
 200                                 case IF_TYPE_IDE:
 201                                 case IF_TYPE_SATA:
 202                                 case IF_TYPE_ATAPI:
 203                                         sprintf ((char *)info->name, "hd%c%d",
 204                                                 'a' + dev_desc->dev, part_num);
 205                                         break;
 206                                 case IF_TYPE_SCSI:
 207                                         sprintf ((char *)info->name, "sd%c%d",
 208                                                 'a' + dev_desc->dev, part_num);
 209                                         break;
 210                                 case IF_TYPE_USB:
 211                                         sprintf ((char *)info->name, "usbd%c%d",
 212                                                 'a' + dev_desc->dev, part_num);
 213                                         break;
 214                                 case IF_TYPE_DOC:
 215                                         sprintf ((char *)info->name, "docd%c%d",
 216                                                 'a' + dev_desc->dev, part_num);
 217                                         break;
 218                                 default:
 219                                         sprintf ((char *)info->name, "xx%c%d",
 220                                                 'a' + dev_desc->dev, part_num);
 221                                         break;
 222                         }
 223                         /* sprintf(info->type, "%d, pt->sys_ind); */
 224                         sprintf ((char *)info->type, "U-Boot");
 225                         return 0;
 226                 }
 227
 228                 /* Reverse engr the fdisk part# assignment rule! */
 229                 if ((ext_part_sector == 0) ||
 230                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 231                         part_num++;
 232                 }
 233         }
 234
 235         /* Follows the extended partitions */
 236         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 237         for (i = 0; i < 4; i++, pt++) {
 238                 if (is_extended (pt->sys_ind)) {
 239                         int lba_start = le32_to_int (pt->start4) + relative;
 240
 241                         return get_partition_info_extended (dev_desc, lba_start,
 242                                  ext_part_sector == 0 ? lba_start : relative,
 243                                  part_num, which_part, info);
 244                 }
 245         }
 246         return -1;
 247 }
 248
 249 void print_part_dos (block_dev_desc_t *dev_desc)
 250 {
 251         printf ("Partition     Start Sector     Num Sectors     Type\n");
 252         print_partition_extended (dev_desc, 0, 0, 1);
 253 }
 254
 255 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 256 {
 257         return get_partition_info_extended (dev_desc, 0, 0, 1, part, info);
 258 }
 259
 260
 261 #endif