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 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 part_get_info_extended(struct blk_desc *dev_desc,
 171                                   lbaint_t ext_part_sector, lbaint_t relative,
 172                                   int part_num, int which_part,
 173                                   disk_partition_t *info, unsigned int disksig)
 174 {
 175         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 176         dos_partition_t *pt;
 177         int i;
 178         int dos_type;
 179
 180         if (dev_desc->block_read(dev_desc, ext_part_sector, 1,
 181                                  (ulong *)buffer) != 1) {
 182                 printf ("** Can't read partition table on %d:" LBAFU " **\n",
 183                         dev_desc->dev, ext_part_sector);
 184                 return -1;
 185         }
 186         if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 187                 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 188                 printf ("bad MBR sector signature 0x%02x%02x\n",
 189                         buffer[DOS_PART_MAGIC_OFFSET],
 190                         buffer[DOS_PART_MAGIC_OFFSET + 1]);
 191                 return -1;
 192         }
 193
 194 #ifdef CONFIG_PARTITION_UUIDS
 195         if (!ext_part_sector)
 196                 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 197 #endif
 198
 199         /* Print all primary/logical partitions */
 200         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 201         for (i = 0; i < 4; i++, pt++) {
 202                 /*
 203                  * fdisk does not show the extended partitions that
 204                  * are not in the MBR
 205                  */
 206                 if (((pt->boot_ind & ~0x80) == 0) &&
 207                     (pt->sys_ind != 0) &&
 208                     (part_num == which_part) &&
 209                     (is_extended(pt->sys_ind) == 0)) {
 210                         info->blksz = DOS_PART_DEFAULT_SECTOR;
 211                         info->start = (lbaint_t)(ext_part_sector +
 212                                         le32_to_int(pt->start4));
 213                         info->size  = (lbaint_t)le32_to_int(pt->size4);
 214                         switch(dev_desc->if_type) {
 215                                 case IF_TYPE_IDE:
 216                                 case IF_TYPE_SATA:
 217                                 case IF_TYPE_ATAPI:
 218                                         sprintf ((char *)info->name, "hd%c%d",
 219                                                 'a' + dev_desc->dev, part_num);
 220                                         break;
 221                                 case IF_TYPE_SCSI:
 222                                         sprintf ((char *)info->name, "sd%c%d",
 223                                                 'a' + dev_desc->dev, part_num);
 224                                         break;
 225                                 case IF_TYPE_USB:
 226                                         sprintf ((char *)info->name, "usbd%c%d",
 227                                                 'a' + dev_desc->dev, part_num);
 228                                         break;
 229                                 case IF_TYPE_DOC:
 230                                         sprintf ((char *)info->name, "docd%c%d",
 231                                                 'a' + dev_desc->dev, part_num);
 232                                         break;
 233                                 default:
 234                                         sprintf ((char *)info->name, "xx%c%d",
 235                                                 'a' + dev_desc->dev, part_num);
 236                                         break;
 237                         }
 238                         /* sprintf(info->type, "%d, pt->sys_ind); */
 239                         strcpy((char *)info->type, "U-Boot");
 240                         info->bootable = is_bootable(pt);
 241 #ifdef CONFIG_PARTITION_UUIDS
 242                         sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 243 #endif
 244                         return 0;
 245                 }
 246
 247                 /* Reverse engr the fdisk part# assignment rule! */
 248                 if ((ext_part_sector == 0) ||
 249                     (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 250                         part_num++;
 251                 }
 252         }
 253
 254         /* Follows the extended partitions */
 255         pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 256         for (i = 0; i < 4; i++, pt++) {
 257                 if (is_extended (pt->sys_ind)) {
 258                         lbaint_t lba_start
 259                                 = le32_to_int (pt->start4) + relative;
 260
 261                         return part_get_info_extended(dev_desc, lba_start,
 262                                  ext_part_sector == 0 ? lba_start : relative,
 263                                  part_num, which_part, info, disksig);
 264                 }
 265         }
 266
 267         /* Check for DOS PBR if no partition is found */
 268         dos_type = test_block_type(buffer);
 269
 270         if (dos_type == DOS_PBR) {
 271                 info->start = 0;
 272                 info->size = dev_desc->lba;
 273                 info->blksz = DOS_PART_DEFAULT_SECTOR;
 274                 info->bootable = 0;
 275                 strcpy((char *)info->type, "U-Boot");
 276 #ifdef CONFIG_PARTITION_UUIDS
 277                 info->uuid[0] = 0;
 278 #endif
 279                 return 0;
 280         }
 281
 282         return -1;
 283 }
 284
 285 void print_part_dos(struct blk_desc *dev_desc)
 286 {
 287         printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
 288         print_partition_extended(dev_desc, 0, 0, 1, 0);
 289 }
 290
 291 int part_get_info_dos(struct blk_desc *dev_desc, int part,
 292                       disk_partition_t *info)
 293 {
 294         return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 295 }
 296
 297 U_BOOT_PART_TYPE(dos) = {
 298         .name           = "DOS",
 299         .part_type      = PART_TYPE_DOS,
 300         .get_info       = part_get_info_ptr(part_get_info_dos),
 301         .print          = part_print_ptr(print_part_dos),
 302         .test           = test_part_dos,
 303 };
 304
 305 #endif