LXR uboot/disk/part

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2001
   4 * Raymond Lo, lo@routefree.com
   5 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   6 */
   7
   8/*
   9 * Support for harddisk partitions.
  10 *
  11 * To be compatible with LinuxPPC and Apple we use the standard Apple
  12 * SCSI disk partitioning scheme. For more information see:
  13 * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
  14 */
  15
  16#include <common.h>
  17#include <command.h>
  18#include <ide.h>
  19#include <memalign.h>
  20#include "part_dos.h"
  21
  22#ifdef CONFIG_HAVE_BLOCK_DEVICE
  23
  24#define DOS_PART_DEFAULT_SECTOR 512
  25
  26/* should this be configurable? It looks like it's not very common at all
  27 * to use large numbers of partitions */
  28#define MAX_EXT_PARTS 256
  29
  30/* Convert char[4] in little endian format to the host format integer
  31 */
  32static inline unsigned int le32_to_int(unsigned char *le32)
  33{
  34    return ((le32[3] << 24) +
  35            (le32[2] << 16) +
  36            (le32[1] << 8) +
  37             le32[0]
  38           );
  39}
  40
  41static inline int is_extended(int part_type)
  42{
  43    return (part_type == 0x5 ||
  44            part_type == 0xf ||
  45            part_type == 0x85);
  46}
  47
  48static inline int is_bootable(dos_partition_t *p)
  49{
  50        return (p->sys_ind == 0xef) || (p->boot_ind == 0x80);
  51}
  52
  53static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
  54                           int part_num, unsigned int disksig)
  55{
  56        lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4);
  57        lbaint_t lba_size  = le32_to_int (p->size4);
  58
  59        printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
  60                "u\t%08x-%02x\t%02x%s%s\n",
  61                part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
  62                (is_extended(p->sys_ind) ? " Extd" : ""),
  63                (is_bootable(p) ? " Boot" : ""));
  64}
  65
  66static int test_block_type(unsigned char *buffer)
  67{
  68        int slot;
  69        struct dos_partition *p;
  70        int part_count = 0;
  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        p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
  77
  78        /* Check that the boot indicators are valid and count the partitions. */
  79        for (slot = 0; slot < 4; ++slot, ++p) {
  80                if (p->boot_ind != 0 && p->boot_ind != 0x80)
  81                        break;
  82                if (p->sys_ind)
  83                        ++part_count;
  84        }
  85
  86        /*
  87         * If the partition table is invalid or empty,
  88         * check if this is a DOS PBR
  89         */
  90        if (slot != 4 || !part_count) {
  91                if (!strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
  92                             "FAT", 3) ||
  93                    !strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
  94                             "FAT32", 5))
  95                        return DOS_PBR; /* This is a DOS PBR and not an MBR */
  96        }
  97        if (slot == 4)
  98                return DOS_MBR; /* This is an DOS MBR */
  99
 100        /* This is neither a DOS MBR nor a DOS PBR */
 101        return -1;
 102}
 103
 104static int part_test_dos(struct blk_desc *dev_desc)
 105{
 106#ifndef CONFIG_SPL_BUILD
 107        ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr,
 108                        DIV_ROUND_UP(dev_desc->blksz, sizeof(legacy_mbr)));
 109
 110        if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
 111                return -1;
 112
 113        if (test_block_type((unsigned char *)mbr) != DOS_MBR)
 114                return -1;
 115
 116        if (dev_desc->sig_type == SIG_TYPE_NONE &&
 117            mbr->unique_mbr_signature != 0) {
 118                dev_desc->sig_type = SIG_TYPE_MBR;
 119                dev_desc->mbr_sig = mbr->unique_mbr_signature;
 120        }
 121#else
 122        ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 123
 124        if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
 125                return -1;
 126
 127        if (test_block_type(buffer) != DOS_MBR)
 128                return -1;
 129#endif
 130
 131        return 0;
 132}
 133
 134/*  Print a partition that is relative to its Extended partition table
 135 */
 136static void print_partition_extended(struct blk_desc *dev_desc,
 137                                     lbaint_t ext_part_sector,
 138                                     lbaint_t relative,
 139                                     int part_num, unsigned int disksig)
 140{
 141        ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 142        dos_partition_t *pt;
 143        int i;
 144
 145        /* set a maximum recursion level */
 146        if (part_num > MAX_EXT_PARTS)
 147        {
 148                printf("** Nested DOS partitions detected, stopping **\n");
 149                return;
 150    }
 151
 152        if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
 153                printf ("** Can't read partition table on %d:" LBAFU " **\n",
 154                        dev_desc->devnum, ext_part_sector);
 155                return;
 156        }
 157        i=test_block_type(buffer);
 158        if (i != DOS_MBR) {
 159                printf ("bad MBR sector signature 0x%02x%02x\n",
 160                        buffer[DOS_PART_MAGIC_OFFSET],
 161                        buffer[DOS_PART_MAGIC_OFFSET + 1]);
 162                return;
 163        }
 164
 165        if (!ext_part_sector)
 166                disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 167
 168        /* Print all primary/logical partitions */
 169        pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 170        for (i = 0; i < 4; i++, pt++) {
 171                /*
 172                 * fdisk does not show the extended partitions that
 173                 * are not in the MBR
 174                 */
 175
 176                if ((pt->sys_ind != 0) &&
 177                    (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 178                        print_one_part(pt, ext_part_sector, part_num, disksig);
 179                }
 180
 181                /* Reverse engr the fdisk part# assignment rule! */
 182                if ((ext_part_sector == 0) ||
 183                    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 184                        part_num++;
 185                }
 186        }
 187
 188        /* Follows the extended partitions */
 189        pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 190        for (i = 0; i < 4; i++, pt++) {
 191                if (is_extended (pt->sys_ind)) {
 192                        lbaint_t lba_start
 193                                = le32_to_int (pt->start4) + relative;
 194
 195                        print_partition_extended(dev_desc, lba_start,
 196                                ext_part_sector == 0  ? lba_start : relative,
 197                                part_num, disksig);
 198                }
 199        }
 200
 201        return;
 202}
 203
 204
 205/*  Print a partition that is relative to its Extended partition table
 206 */
 207static int part_get_info_extended(struct blk_desc *dev_desc,
 208                                  lbaint_t ext_part_sector, lbaint_t relative,
 209                                  int part_num, int which_part,
 210                                  disk_partition_t *info, unsigned int disksig)
 211{
 212        ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 213        dos_partition_t *pt;
 214        int i;
 215        int dos_type;
 216
 217        /* set a maximum recursion level */
 218        if (part_num > MAX_EXT_PARTS)
 219        {
 220                printf("** Nested DOS partitions detected, stopping **\n");
 221                return -1;
 222    }
 223
 224        if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
 225                printf ("** Can't read partition table on %d:" LBAFU " **\n",
 226                        dev_desc->devnum, ext_part_sector);
 227                return -1;
 228        }
 229        if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 230                buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 231                printf ("bad MBR sector signature 0x%02x%02x\n",
 232                        buffer[DOS_PART_MAGIC_OFFSET],
 233                        buffer[DOS_PART_MAGIC_OFFSET + 1]);
 234                return -1;
 235        }
 236
 237#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 238        if (!ext_part_sector)
 239                disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 240#endif
 241
 242        /* Print all primary/logical partitions */
 243        pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 244        for (i = 0; i < 4; i++, pt++) {
 245                /*
 246                 * fdisk does not show the extended partitions that
 247                 * are not in the MBR
 248                 */
 249                if (((pt->boot_ind & ~0x80) == 0) &&
 250                    (pt->sys_ind != 0) &&
 251                    (part_num == which_part) &&
 252                    (ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) {
 253                        info->blksz = DOS_PART_DEFAULT_SECTOR;
 254                        info->start = (lbaint_t)(ext_part_sector +
 255                                        le32_to_int(pt->start4));
 256                        info->size  = (lbaint_t)le32_to_int(pt->size4);
 257                        part_set_generic_name(dev_desc, part_num,
 258                                              (char *)info->name);
 259                        /* sprintf(info->type, "%d, pt->sys_ind); */
 260                        strcpy((char *)info->type, "U-Boot");
 261                        info->bootable = is_bootable(pt);
 262#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 263                        sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 264#endif
 265                        info->sys_ind = pt->sys_ind;
 266                        return 0;
 267                }
 268
 269                /* Reverse engr the fdisk part# assignment rule! */
 270                if ((ext_part_sector == 0) ||
 271                    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 272                        part_num++;
 273                }
 274        }
 275
 276        /* Follows the extended partitions */
 277        pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 278        for (i = 0; i < 4; i++, pt++) {
 279                if (is_extended (pt->sys_ind)) {
 280                        lbaint_t lba_start
 281                                = le32_to_int (pt->start4) + relative;
 282
 283                        return part_get_info_extended(dev_desc, lba_start,
 284                                 ext_part_sector == 0 ? lba_start : relative,
 285                                 part_num, which_part, info, disksig);
 286                }
 287        }
 288
 289        /* Check for DOS PBR if no partition is found */
 290        dos_type = test_block_type(buffer);
 291
 292        if (dos_type == DOS_PBR) {
 293                info->start = 0;
 294                info->size = dev_desc->lba;
 295                info->blksz = DOS_PART_DEFAULT_SECTOR;
 296                info->bootable = 0;
 297                strcpy((char *)info->type, "U-Boot");
 298#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 299                info->uuid[0] = 0;
 300#endif
 301                return 0;
 302        }
 303
 304        return -1;
 305}
 306
 307void part_print_dos(struct blk_desc *dev_desc)
 308{
 309        printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
 310        print_partition_extended(dev_desc, 0, 0, 1, 0);
 311}
 312
 313int part_get_info_dos(struct blk_desc *dev_desc, int part,
 314                      disk_partition_t *info)
 315{
 316        return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 317}
 318
 319int is_valid_dos_buf(void *buf)
 320{
 321        return test_block_type(buf) == DOS_MBR ? 0 : -1;
 322}
 323
 324int write_mbr_partition(struct blk_desc *dev_desc, void *buf)
 325{
 326        if (is_valid_dos_buf(buf))
 327                return -1;
 328
 329        /* write MBR */
 330        if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
 331                printf("%s: failed writing '%s' (1 blks at 0x0)\n",
 332                       __func__, "MBR");
 333                return 1;
 334        }
 335
 336        return 0;
 337}
 338
 339U_BOOT_PART_TYPE(dos) = {
 340        .name           = "DOS",
 341        .part_type      = PART_TYPE_DOS,
 342        .max_entries    = DOS_ENTRY_NUMBERS,
 343        .get_info       = part_get_info_ptr(part_get_info_dos),
 344        .print          = part_print_ptr(part_print_dos),
 345        .test           = part_test_dos,
 346};
 347
 348#endif
 349