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 int test_part_dos(struct blk_desc *dev_desc)
  91 {
  92         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
  93
  94         if (dev_desc->block_read(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 (dev_desc->block_read(dev_desc, ext_part_sector, 1,
 115                                  (ulong *)buffer) != 1) {
 116                 printf ("** Can't read partition table on %d:" LBAFU " **\n",
 117                         dev_desc->dev, ext_part_sector);
 118                 return;
 119         }
 120         i=test_block_type(buffer);
 121         if (i != DOS_MBR) {
 122                 printf ("bad MBR sector signature 0x%02x%02x\n",
 123                         buffer[DOS_PART_MAGIC_OFFSET],
 124                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 125                 return;
 126         }
 127
 128         if (!ext_part_sector)
 129                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 130
 131         /* Print all primary/logical partitions */
 132         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 133         for (i = 0; i < 4; i++, pt++) {
 134                 /*
 135                  * fdisk does not show the extended partitions that
 136                  * are not in the MBR
 137                  */
 138
 139                 if ((pt->sys_ind != 0) &&
 140                     (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 141                         print_one_part(pt, ext_part_sector, part_num, disksig);
 142                 }
 143
 144                 /* Reverse engr the fdisk part# assignment rule! */
 145                 if ((ext_part_sector == 0) ||
 146                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 147                         part_num++;
 148                 }
 149         }
 150
 151         /* Follows the extended partitions */
 152         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 153         for (i = 0; i < 4; i++, pt++) {
 154                 if (is_extended (pt->sys_ind)) {
 155                         lbaint_t lba_start
 156                                 = le32_to_int (pt->start4) + relative;
 157
 158                         print_partition_extended(dev_desc, lba_start,
 159                                 ext_part_sector == 0  ? lba_start : relative,
 160                                 part_num, disksig);
 161                 }
 162         }
 163
 164         return;
 165 }
 166
 167
 168 /*  Print a partition that is relative to its Extended partition table
 169  */
 170 static int get_partition_info_extended(struct blk_desc *dev_desc,
 171                                        lbaint_t ext_part_sector,
 172                                        lbaint_t relative, int part_num,
 173                                        int which_part, disk_partition_t *info,
 174                                        unsigned int disksig)
 175 {
 176         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 177         dos_partition_t *pt;
 178         int i;
 179         int dos_type;
 180
 181         if (dev_desc->block_read(dev_desc, ext_part_sector, 1,
 182                                  (ulong *)buffer) != 1) {
 183                 printf ("** Can't read partition table on %d:" LBAFU " **\n",
 184                         dev_desc->dev, ext_part_sector);
 185                 return -1;
 186         }
 187         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 188                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 189                 printf ("bad MBR sector signature 0x%02x%02x\n",
 190                         buffer[DOS_PART_MAGIC_OFFSET],
 191                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 192                 return -1;
 193         }
 194
 195 #ifdef CONFIG_PARTITION_UUIDS
 196         if (!ext_part_sector)
 197                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 198 #endif
 199
 200         /* Print all primary/logical partitions */
 201         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 202         for (i = 0; i < 4; i++, pt++) {
 203                 /*
 204                  * fdisk does not show the extended partitions that
 205                  * are not in the MBR
 206                  */
 207                 if (((pt->boot_ind & ~0x80) == 0) &&
 208                     (pt->sys_ind != 0) &&
 209                     (part_num == which_part) &&
 210                     (is_extended(pt->sys_ind) == 0)) {
 211                         info->blksz = DOS_PART_DEFAULT_SECTOR;
 212                         info->start = (lbaint_t)(ext_part_sector +
 213                                         le32_to_int(pt->start4));
 214                         info->size  = (lbaint_t)le32_to_int(pt->size4);
 215                         switch(dev_desc->if_type) {
 216                                 case IF_TYPE_IDE:
 217                                 case IF_TYPE_SATA:
 218                                 case IF_TYPE_ATAPI:
 219                                         sprintf ((char *)info->name, "hd%c%d",
 220                                                 'a' + dev_desc->dev, part_num);
 221                                         break;
 222                                 case IF_TYPE_SCSI:
 223                                         sprintf ((char *)info->name, "sd%c%d",
 224                                                 'a' + dev_desc->dev, part_num);
 225                                         break;
 226                                 case IF_TYPE_USB:
 227                                         sprintf ((char *)info->name, "usbd%c%d",
 228                                                 'a' + dev_desc->dev, part_num);
 229                                         break;
 230                                 case IF_TYPE_DOC:
 231                                         sprintf ((char *)info->name, "docd%c%d",
 232                                                 'a' + dev_desc->dev, part_num);
 233                                         break;
 234                                 default:
 235                                         sprintf ((char *)info->name, "xx%c%d",
 236                                                 'a' + dev_desc->dev, part_num);
 237                                         break;
 238                         }
 239                         /* sprintf(info->type, "%d, pt->sys_ind); */
 240                         strcpy((char *)info->type, "U-Boot");
 241                         info->bootable = is_bootable(pt);
 242 #ifdef CONFIG_PARTITION_UUIDS
 243                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 244 #endif
 245                         return 0;
 246                 }
 247
 248                 /* Reverse engr the fdisk part# assignment rule! */
 249                 if ((ext_part_sector == 0) ||
 250                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 251                         part_num++;
 252                 }
 253         }
 254
 255         /* Follows the extended partitions */
 256         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 257         for (i = 0; i < 4; i++, pt++) {
 258                 if (is_extended (pt->sys_ind)) {
 259                         lbaint_t lba_start
 260                                 = le32_to_int (pt->start4) + relative;
 261
 262                         return get_partition_info_extended (dev_desc, lba_start,
 263                                  ext_part_sector == 0 ? lba_start : relative,
 264                                  part_num, which_part, info, disksig);
 265                 }
 266         }
 267
 268         /* Check for DOS PBR if no partition is found */
 269         dos_type = test_block_type(buffer);
 270
 271         if (dos_type == DOS_PBR) {
 272                 info->start = 0;
 273                 info->size = dev_desc->lba;
 274                 info->blksz = DOS_PART_DEFAULT_SECTOR;
 275                 info->bootable = 0;
 276                 strcpy((char *)info->type, "U-Boot");
 277 #ifdef CONFIG_PARTITION_UUIDS
 278                 info->uuid[0] = 0;
 279 #endif
 280                 return 0;
 281         }
 282
 283         return -1;
 284 }
 285
 286 void print_part_dos(struct blk_desc *dev_desc)
 287 {
 288         printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
 289         print_partition_extended(dev_desc, 0, 0, 1, 0);
 290 }
 291
 292 int get_partition_info_dos(struct blk_desc *dev_desc, int part,
 293                            disk_partition_t *info)
 294 {
 295         return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 296 }
 297
 298
 299 #endif