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  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 /*
  10  * Support for harddisk partitions.
  11  *
  12  * To be compatible with LinuxPPC and Apple we use the standard Apple
  13  * SCSI disk partitioning scheme. For more information see:
  14  * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
  15  */
  16
  17 #include <common.h>
  18 #include <command.h>
  19 #include <ide.h>
  20 #include <memalign.h>
  21 #include "part_dos.h"
  22
  23 #ifdef HAVE_BLOCK_DEVICE
  24
  25 #define DOS_PART_DEFAULT_SECTOR 512
  26
  27 /* Convert char[4] in little endian format to the host format integer
  28  */
  29 static inline int le32_to_int(unsigned char *le32)
  30 {
  31     return ((le32[3] << 24) +
  32             (le32[2] << 16) +
  33             (le32[1] << 8) +
  34              le32[0]
  35            );
  36 }
  37
  38 static inline int is_extended(int part_type)
  39 {
  40     return (part_type == 0x5 ||
  41             part_type == 0xf ||
  42             part_type == 0x85);
  43 }
  44
  45 static inline int is_bootable(dos_partition_t *p)
  46 {
  47         return p->boot_ind == 0x80;
  48 }
  49
  50 static void print_one_part(dos_partition_t *p, int ext_part_sector,
  51                            int part_num, unsigned int disksig)
  52 {
  53         int lba_start = ext_part_sector + le32_to_int (p->start4);
  54         int lba_size  = le32_to_int (p->size4);
  55
  56         printf("%3d\t%-10d\t%-10d\t%08x-%02x\t%02x%s%s\n",
  57                 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
  58                 (is_extended(p->sys_ind) ? " Extd" : ""),
  59                 (is_bootable(p) ? " Boot" : ""));
  60 }
  61
  62 static int test_block_type(unsigned char *buffer)
  63 {
  64         int slot;
  65         struct dos_partition *p;
  66
  67         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  68             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  69                 return (-1);
  70         } /* no DOS Signature at all */
  71         p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
  72         for (slot = 0; slot < 3; slot++) {
  73                 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
  74                         if (!slot &&
  75                             (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
  76                                      "FAT", 3) == 0 ||
  77                              strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
  78                                      "FAT32", 5) == 0)) {
  79                                 return DOS_PBR; /* is PBR */
  80                         } else {
  81                                 return -1;
  82                         }
  83                 }
  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         int dos_type;
 175
 176         if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
 177                 printf ("** Can't read partition table on %d:%d **\n",
 178                         dev_desc->dev, ext_part_sector);
 179                 return -1;
 180         }
 181         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 182                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 183                 printf ("bad MBR sector signature 0x%02x%02x\n",
 184                         buffer[DOS_PART_MAGIC_OFFSET],
 185                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 186                 return -1;
 187         }
 188
 189 #ifdef CONFIG_PARTITION_UUIDS
 190         if (!ext_part_sector)
 191                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 192 #endif
 193
 194         /* Print all primary/logical partitions */
 195         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 196         for (i = 0; i < 4; i++, pt++) {
 197                 /*
 198                  * fdisk does not show the extended partitions that
 199                  * are not in the MBR
 200                  */
 201                 if (((pt->boot_ind & ~0x80) == 0) &&
 202                     (pt->sys_ind != 0) &&
 203                     (part_num == which_part) &&
 204                     (is_extended(pt->sys_ind) == 0)) {
 205                         info->blksz = DOS_PART_DEFAULT_SECTOR;
 206                         info->start = (lbaint_t)(ext_part_sector +
 207                                         le32_to_int(pt->start4));
 208                         info->size  = (lbaint_t)le32_to_int(pt->size4);
 209                         switch(dev_desc->if_type) {
 210                                 case IF_TYPE_IDE:
 211                                 case IF_TYPE_SATA:
 212                                 case IF_TYPE_ATAPI:
 213                                         sprintf ((char *)info->name, "hd%c%d",
 214                                                 'a' + dev_desc->dev, part_num);
 215                                         break;
 216                                 case IF_TYPE_SCSI:
 217                                         sprintf ((char *)info->name, "sd%c%d",
 218                                                 'a' + dev_desc->dev, part_num);
 219                                         break;
 220                                 case IF_TYPE_USB:
 221                                         sprintf ((char *)info->name, "usbd%c%d",
 222                                                 'a' + dev_desc->dev, part_num);
 223                                         break;
 224                                 case IF_TYPE_DOC:
 225                                         sprintf ((char *)info->name, "docd%c%d",
 226                                                 'a' + dev_desc->dev, part_num);
 227                                         break;
 228                                 default:
 229                                         sprintf ((char *)info->name, "xx%c%d",
 230                                                 'a' + dev_desc->dev, part_num);
 231                                         break;
 232                         }
 233                         /* sprintf(info->type, "%d, pt->sys_ind); */
 234                         sprintf ((char *)info->type, "U-Boot");
 235                         info->bootable = is_bootable(pt);
 236 #ifdef CONFIG_PARTITION_UUIDS
 237                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 238 #endif
 239                         return 0;
 240                 }
 241
 242                 /* Reverse engr the fdisk part# assignment rule! */
 243                 if ((ext_part_sector == 0) ||
 244                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 245                         part_num++;
 246                 }
 247         }
 248
 249         /* Follows the extended partitions */
 250         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 251         for (i = 0; i < 4; i++, pt++) {
 252                 if (is_extended (pt->sys_ind)) {
 253                         int lba_start = le32_to_int (pt->start4) + relative;
 254
 255                         return get_partition_info_extended (dev_desc, lba_start,
 256                                  ext_part_sector == 0 ? lba_start : relative,
 257                                  part_num, which_part, info, disksig);
 258                 }
 259         }
 260
 261         /* Check for DOS PBR if no partition is found */
 262         dos_type = test_block_type(buffer);
 263
 264         if (dos_type == DOS_PBR) {
 265                 info->start = 0;
 266                 info->size = dev_desc->lba;
 267                 info->blksz = DOS_PART_DEFAULT_SECTOR;
 268                 info->bootable = 0;
 269                 sprintf ((char *)info->type, "U-Boot");
 270 #ifdef CONFIG_PARTITION_UUIDS
 271                 info->uuid[0] = 0;
 272 #endif
 273                 return 0;
 274         }
 275
 276         return -1;
 277 }
 278
 279 void print_part_dos (block_dev_desc_t *dev_desc)
 280 {
 281         printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
 282         print_partition_extended(dev_desc, 0, 0, 1, 0);
 283 }
 284
 285 int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
 286 {
 287         return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 288 }
 289
 290
 291 #endif