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 ((CONFIG_COMMANDS & CFG_CMD_IDE)    || \
  39      (CONFIG_COMMANDS & CFG_CMD_SCSI)   || \
  40      (CONFIG_COMMANDS & CFG_CMD_USB)    || \
  41      defined(CONFIG_MMC) || \
  42      defined(CONFIG_SYSTEMACE) ) && defined(CONFIG_DOS_PARTITION)
  43
  44 /* Convert char[4] in little endian format to the host format integer
  45  */
  46 static inline int le32_to_int(unsigned char *le32)
  47 {
  48     return ((le32[3] << 24) +
  49             (le32[2] << 16) +
  50             (le32[1] << 8) +
  51              le32[0]
  52            );
  53 }
  54
  55 static inline int is_extended(int part_type)
  56 {
  57     return (part_type == 0x5 ||
  58             part_type == 0xf ||
  59             part_type == 0x85);
  60 }
  61
  62 static void print_one_part (dos_partition_t *p, int ext_part_sector, int part_num)
  63 {
  64         int lba_start = ext_part_sector + le32_to_int (p->start4);
  65         int lba_size  = le32_to_int (p->size4);
  66
  67         printf ("%5d\t\t%10d\t%10d\t%2x%s\n",
  68                 part_num, lba_start, lba_size, p->sys_ind,
  69                 (is_extended (p->sys_ind) ? " Extd" : ""));
  70 }
  71
  72 static int test_block_type(unsigned char *buffer)
  73 {
  74         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  75             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  76                 return (-1);
  77         } /* no DOS Signature at all */
  78         if(strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],"FAT",3)==0)
  79                 return DOS_PBR; /* is PBR */
  80         return DOS_MBR;     /* Is MBR */
  81 }
  82
  83
  84 int test_part_dos (block_dev_desc_t *dev_desc)
  85 {
  86         unsigned char buffer[DEFAULT_SECTOR_SIZE];
  87
  88         if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1) ||
  89             (buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  90             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  91                 return (-1);
  92         }
  93         return (0);
  94 }
  95
  96 /*  Print a partition that is relative to its Extended partition table
  97  */
  98 static void print_partition_extended (block_dev_desc_t *dev_desc, int ext_part_sector, int relative,
  99                                                            int part_num)
 100 {
 101         unsigned char buffer[DEFAULT_SECTOR_SIZE];
 102         dos_partition_t *pt;
 103         int i;
 104
 105         if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 106                 printf ("** Can't read partition table on %d:%d **\n",
 107                         dev_desc->dev, ext_part_sector);
 108                 return;
 109         }
 110         i=test_block_type(buffer);
 111         if(i==-1) {
 112                 printf ("bad MBR sector signature 0x%02x%02x\n",
 113                         buffer[DOS_PART_MAGIC_OFFSET],
 114                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 115                 return;
 116         }
 117         if(i==DOS_PBR) {
 118                 printf ("    1\t\t         0\t%10ld\t%2x\n",
 119                         dev_desc->lba, buffer[DOS_PBR_MEDIA_TYPE_OFFSET]);
 120                 return;
 121         }
 122         /* Print all primary/logical partitions */
 123         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 124         for (i = 0; i < 4; i++, pt++) {
 125                 /*
 126                  * fdisk does not show the extended partitions that
 127                  * are not in the MBR
 128                  */
 129
 130                 if ((pt->sys_ind != 0) &&
 131                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 132                         print_one_part (pt, ext_part_sector, part_num);
 133                 }
 134
 135                 /* Reverse engr the fdisk part# assignment rule! */
 136                 if ((ext_part_sector == 0) ||
 137                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 138                         part_num++;
 139                 }
 140         }
 141
 142         /* Follows the extended partitions */
 143         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 144         for (i = 0; i < 4; i++, pt++) {
 145                 if (is_extended (pt->sys_ind)) {
 146                         int lba_start = le32_to_int (pt->start4) + relative;
 147
 148                         print_partition_extended (dev_desc, lba_start,
 149                                                   ext_part_sector == 0  ? lba_start
 150                                                                         : relative,
 151                                                   part_num);
 152                 }
 153         }
 154
 155         return;
 156 }
 157
 158
 159 /*  Print a partition that is relative to its Extended partition table
 160  */
 161 static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
 162                                  int relative, int part_num,
 163                                  int which_part, disk_partition_t *info)
 164 {
 165         unsigned char buffer[DEFAULT_SECTOR_SIZE];
 166         dos_partition_t *pt;
 167         int i;
 168
 169         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 170                 printf ("** Can't read partition table on %d:%d **\n",
 171                         dev_desc->dev, ext_part_sector);
 172                 return -1;
 173         }
 174         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 175                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 176                 printf ("bad MBR sector signature 0x%02x%02x\n",
 177                         buffer[DOS_PART_MAGIC_OFFSET],
 178                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 179                 return -1;
 180         }
 181
 182         /* Print all primary/logical partitions */
 183         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 184         for (i = 0; i < 4; i++, pt++) {
 185                 /*
 186                  * fdisk does not show the extended partitions that
 187                  * are not in the MBR
 188                  */
 189                 if ((pt->sys_ind != 0) &&
 190                     (part_num == which_part) &&
 191                     (is_extended(pt->sys_ind) == 0)) {
 192                         info->blksz = 512;
 193                         info->start = ext_part_sector + le32_to_int (pt->start4);
 194                         info->size  = le32_to_int (pt->size4);
 195                         switch(dev_desc->if_type) {
 196                                 case IF_TYPE_IDE:
 197                                 case IF_TYPE_ATAPI:
 198                                         sprintf ((char *)info->name, "hd%c%d\n", 'a' + dev_desc->dev, part_num);
 199                                         break;
 200                                 case IF_TYPE_SCSI:
 201                                         sprintf ((char *)info->name, "sd%c%d\n", 'a' + dev_desc->dev, part_num);
 202                                         break;
 203                                 case IF_TYPE_USB:
 204                                         sprintf ((char *)info->name, "usbd%c%d\n", 'a' + dev_desc->dev, part_num);
 205                                         break;
 206                                 case IF_TYPE_DOC:
 207                                         sprintf ((char *)info->name, "docd%c%d\n", 'a' + dev_desc->dev, part_num);
 208                                         break;
 209                                 default:
 210                                         sprintf ((char *)info->name, "xx%c%d\n", 'a' + dev_desc->dev, part_num);
 211                                         break;
 212                         }
 213                         /* sprintf(info->type, "%d, pt->sys_ind); */
 214                         sprintf ((char *)info->type, "U-Boot");
 215                         return 0;
 216                 }
 217
 218                 /* Reverse engr the fdisk part# assignment rule! */
 219                 if ((ext_part_sector == 0) ||
 220                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 221                         part_num++;
 222                 }
 223         }
 224
 225         /* Follows the extended partitions */
 226         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 227         for (i = 0; i < 4; i++, pt++) {
 228                 if (is_extended (pt->sys_ind)) {
 229                         int lba_start = le32_to_int (pt->start4) + relative;
 230
 231                         return get_partition_info_extended (dev_desc, lba_start,
 232                                  ext_part_sector == 0 ? lba_start : relative,
 233                                  part_num, which_part, info);
 234                 }
 235         }
 236         return -1;
 237 }
 238
 239 void print_part_dos (block_dev_desc_t *dev_desc)
 240 {
 241         printf ("Partition     Start Sector     Num Sectors     Type\n");
 242         print_partition_extended (dev_desc, 0, 0, 1);
 243 }
 244
 245 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 246 {
 247         return get_partition_info_extended (dev_desc, 0, 0, 1, part, info);
 248 }
 249
 250
 251 #endif  /* (CONFIG_COMMANDS & CFG_CMD_IDE) && CONFIG_DOS_PARTITION */