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