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 unsigned 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, lbaint_t ext_part_sector,
  51                            int part_num, unsigned int disksig)
  52 {
  53         lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4);
  54         lbaint_t lba_size  = le32_to_int (p->size4);
  55
  56         printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
  57                 "u\t%08x-%02x\t%02x%s%s\n",
  58                 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
  59                 (is_extended(p->sys_ind) ? " Extd" : ""),
  60                 (is_bootable(p) ? " Boot" : ""));
  61 }
  62
  63 static int test_block_type(unsigned char *buffer)
  64 {
  65         int slot;
  66         struct dos_partition *p;
  67
  68         if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  69             (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  70                 return (-1);
  71         } /* no DOS Signature at all */
  72         p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
  73         for (slot = 0; slot < 3; slot++) {
  74                 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
  75                         if (!slot &&
  76                             (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
  77                                      "FAT", 3) == 0 ||
  78                              strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
  79                                      "FAT32", 5) == 0)) {
  80                                 return DOS_PBR; /* is PBR */
  81                         } else {
  82                                 return -1;
  83                         }
  84                 }
  85         }
  86         return DOS_MBR;     /* Is MBR */
  87 }
  88
  89
  90 static int part_test_dos(struct blk_desc *dev_desc)
  91 {
  92         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
  93
  94         if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
  95                 return -1;
  96
  97         if (test_block_type(buffer) != DOS_MBR)
  98                 return -1;
  99
 100         return 0;
 101 }
 102
 103 /*  Print a partition that is relative to its Extended partition table
 104  */
 105 static void print_partition_extended(struct blk_desc *dev_desc,
 106                                      lbaint_t ext_part_sector,
 107                                      lbaint_t relative,
 108                                      int part_num, unsigned int disksig)
 109 {
 110         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 111         dos_partition_t *pt;
 112         int i;
 113
 114         if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
 115                 printf ("** Can't read partition table on %d:" LBAFU " **\n",
 116                         dev_desc->devnum, ext_part_sector);
 117                 return;
 118         }
 119         i=test_block_type(buffer);
 120         if (i != DOS_MBR) {
 121                 printf ("bad MBR sector signature 0x%02x%02x\n",
 122                         buffer[DOS_PART_MAGIC_OFFSET],
 123                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 124                 return;
 125         }
 126
 127         if (!ext_part_sector)
 128                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 129
 130         /* Print all primary/logical partitions */
 131         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 132         for (i = 0; i < 4; i++, pt++) {
 133                 /*
 134                  * fdisk does not show the extended partitions that
 135                  * are not in the MBR
 136                  */
 137
 138                 if ((pt->sys_ind != 0) &&
 139                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 140                         print_one_part(pt, ext_part_sector, part_num, disksig);
 141                 }
 142
 143                 /* Reverse engr the fdisk part# assignment rule! */
 144                 if ((ext_part_sector == 0) ||
 145                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 146                         part_num++;
 147                 }
 148         }
 149
 150         /* Follows the extended partitions */
 151         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 152         for (i = 0; i < 4; i++, pt++) {
 153                 if (is_extended (pt->sys_ind)) {
 154                         lbaint_t lba_start
 155                                 = le32_to_int (pt->start4) + relative;
 156
 157                         print_partition_extended(dev_desc, lba_start,
 158                                 ext_part_sector == 0  ? lba_start : relative,
 159                                 part_num, disksig);
 160                 }
 161         }
 162
 163         return;
 164 }
 165
 166
 167 /*  Print a partition that is relative to its Extended partition table
 168  */
 169 static int part_get_info_extended(struct blk_desc *dev_desc,
 170                                   lbaint_t ext_part_sector, lbaint_t relative,
 171                                   int part_num, int which_part,
 172                                   disk_partition_t *info, unsigned int disksig)
 173 {
 174         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 175         dos_partition_t *pt;
 176         int i;
 177         int dos_type;
 178
 179         if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
 180                 printf ("** Can't read partition table on %d:" LBAFU " **\n",
 181                         dev_desc->devnum, ext_part_sector);
 182                 return -1;
 183         }
 184         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 185                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 186                 printf ("bad MBR sector signature 0x%02x%02x\n",
 187                         buffer[DOS_PART_MAGIC_OFFSET],
 188                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 189                 return -1;
 190         }
 191
 192 #ifdef CONFIG_PARTITION_UUIDS
 193         if (!ext_part_sector)
 194                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 195 #endif
 196
 197         /* Print all primary/logical partitions */
 198         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 199         for (i = 0; i < 4; i++, pt++) {
 200                 /*
 201                  * fdisk does not show the extended partitions that
 202                  * are not in the MBR
 203                  */
 204                 if (((pt->boot_ind & ~0x80) == 0) &&
 205                     (pt->sys_ind != 0) &&
 206                     (part_num == which_part) &&
 207                     (is_extended(pt->sys_ind) == 0)) {
 208                         info->blksz = DOS_PART_DEFAULT_SECTOR;
 209                         info->start = (lbaint_t)(ext_part_sector +
 210                                         le32_to_int(pt->start4));
 211                         info->size  = (lbaint_t)le32_to_int(pt->size4);
 212                         switch(dev_desc->if_type) {
 213                                 case IF_TYPE_IDE:
 214                                 case IF_TYPE_SATA:
 215                                 case IF_TYPE_ATAPI:
 216                                         sprintf((char *)info->name, "hd%c%d",
 217                                                 'a' + dev_desc->devnum,
 218                                                 part_num);
 219                                         break;
 220                                 case IF_TYPE_SCSI:
 221                                         sprintf((char *)info->name, "sd%c%d",
 222                                                 'a' + dev_desc->devnum,
 223                                                 part_num);
 224                                         break;
 225                                 case IF_TYPE_USB:
 226                                         sprintf((char *)info->name, "usbd%c%d",
 227                                                 'a' + dev_desc->devnum,
 228                                                 part_num);
 229                                         break;
 230                                 case IF_TYPE_DOC:
 231                                         sprintf((char *)info->name, "docd%c%d",
 232                                                 'a' + dev_desc->devnum,
 233                                                 part_num);
 234                                         break;
 235                                 default:
 236                                         sprintf((char *)info->name, "xx%c%d",
 237                                                 'a' + dev_desc->devnum,
 238                                                 part_num);
 239                                         break;
 240                         }
 241                         /* sprintf(info->type, "%d, pt->sys_ind); */
 242                         strcpy((char *)info->type, "U-Boot");
 243                         info->bootable = is_bootable(pt);
 244 #ifdef CONFIG_PARTITION_UUIDS
 245                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 246 #endif
 247                         return 0;
 248                 }
 249
 250                 /* Reverse engr the fdisk part# assignment rule! */
 251                 if ((ext_part_sector == 0) ||
 252                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 253                         part_num++;
 254                 }
 255         }
 256
 257         /* Follows the extended partitions */
 258         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 259         for (i = 0; i < 4; i++, pt++) {
 260                 if (is_extended (pt->sys_ind)) {
 261                         lbaint_t lba_start
 262                                 = le32_to_int (pt->start4) + relative;
 263
 264                         return part_get_info_extended(dev_desc, lba_start,
 265                                  ext_part_sector == 0 ? lba_start : relative,
 266                                  part_num, which_part, info, disksig);
 267                 }
 268         }
 269
 270         /* Check for DOS PBR if no partition is found */
 271         dos_type = test_block_type(buffer);
 272
 273         if (dos_type == DOS_PBR) {
 274                 info->start = 0;
 275                 info->size = dev_desc->lba;
 276                 info->blksz = DOS_PART_DEFAULT_SECTOR;
 277                 info->bootable = 0;
 278                 strcpy((char *)info->type, "U-Boot");
 279 #ifdef CONFIG_PARTITION_UUIDS
 280                 info->uuid[0] = 0;
 281 #endif
 282                 return 0;
 283         }
 284
 285         return -1;
 286 }
 287
 288 void part_print_dos(struct blk_desc *dev_desc)
 289 {
 290         printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
 291         print_partition_extended(dev_desc, 0, 0, 1, 0);
 292 }
 293
 294 int part_get_info_dos(struct blk_desc *dev_desc, int part,
 295                       disk_partition_t *info)
 296 {
 297         return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 298 }
 299
 300 U_BOOT_PART_TYPE(dos) = {
 301         .name           = "DOS",
 302         .part_type      = PART_TYPE_DOS,
 303         .get_info       = part_get_info_ptr(part_get_info_dos),
 304         .print          = part_print_ptr(part_print_dos),
 305         .test           = part_test_dos,
 306 };
 307
 308 #endif