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/* Convert char[4] in little endian format to the host format integer
  27 */
  28static inline unsigned int le32_to_int(unsigned char *le32)
  29{
  30    return ((le32[3] << 24) +
  31            (le32[2] << 16) +
  32            (le32[1] << 8) +
  33             le32[0]
  34           );
  35}
  36
  37static inline int is_extended(int part_type)
  38{
  39    return (part_type == 0x5 ||
  40            part_type == 0xf ||
  41            part_type == 0x85);
  42}
  43
  44static inline int is_bootable(dos_partition_t *p)
  45{
  46        return (p->sys_ind == 0xef) || (p->boot_ind == 0x80);
  47}
  48
  49static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
  50                           int part_num, unsigned int disksig)
  51{
  52        lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4);
  53        lbaint_t lba_size  = le32_to_int (p->size4);
  54
  55        printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
  56                "u\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
  62static 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
  89static int part_test_dos(struct blk_desc *dev_desc)
  90{
  91#ifndef CONFIG_SPL_BUILD
  92        ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, 1);
  93
  94        if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
  95                return -1;
  96
  97        if (test_block_type((unsigned char *)mbr) != DOS_MBR)
  98                return -1;
  99
 100        if (dev_desc->sig_type == SIG_TYPE_NONE &&
 101            mbr->unique_mbr_signature != 0) {
 102                dev_desc->sig_type = SIG_TYPE_MBR;
 103                dev_desc->mbr_sig = mbr->unique_mbr_signature;
 104        }
 105#else
 106        ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 107
 108        if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
 109                return -1;
 110
 111        if (test_block_type(buffer) != DOS_MBR)
 112                return -1;
 113#endif
 114
 115        return 0;
 116}
 117
 118/*  Print a partition that is relative to its Extended partition table
 119 */
 120static void print_partition_extended(struct blk_desc *dev_desc,
 121                                     lbaint_t ext_part_sector,
 122                                     lbaint_t relative,
 123                                     int part_num, unsigned int disksig)
 124{
 125        ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 126        dos_partition_t *pt;
 127        int i;
 128
 129        if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
 130                printf ("** Can't read partition table on %d:" LBAFU " **\n",
 131                        dev_desc->devnum, ext_part_sector);
 132                return;
 133        }
 134        i=test_block_type(buffer);
 135        if (i != DOS_MBR) {
 136                printf ("bad MBR sector signature 0x%02x%02x\n",
 137                        buffer[DOS_PART_MAGIC_OFFSET],
 138                        buffer[DOS_PART_MAGIC_OFFSET + 1]);
 139                return;
 140        }
 141
 142        if (!ext_part_sector)
 143                disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 144
 145        /* Print all primary/logical partitions */
 146        pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 147        for (i = 0; i < 4; i++, pt++) {
 148                /*
 149                 * fdisk does not show the extended partitions that
 150                 * are not in the MBR
 151                 */
 152
 153                if ((pt->sys_ind != 0) &&
 154                    (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
 155                        print_one_part(pt, ext_part_sector, part_num, disksig);
 156                }
 157
 158                /* Reverse engr the fdisk part# assignment rule! */
 159                if ((ext_part_sector == 0) ||
 160                    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 161                        part_num++;
 162                }
 163        }
 164
 165        /* Follows the extended partitions */
 166        pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 167        for (i = 0; i < 4; i++, pt++) {
 168                if (is_extended (pt->sys_ind)) {
 169                        lbaint_t lba_start
 170                                = le32_to_int (pt->start4) + relative;
 171
 172                        print_partition_extended(dev_desc, lba_start,
 173                                ext_part_sector == 0  ? lba_start : relative,
 174                                part_num, disksig);
 175                }
 176        }
 177
 178        return;
 179}
 180
 181
 182/*  Print a partition that is relative to its Extended partition table
 183 */
 184static int part_get_info_extended(struct blk_desc *dev_desc,
 185                                  lbaint_t ext_part_sector, lbaint_t relative,
 186                                  int part_num, int which_part,
 187                                  disk_partition_t *info, unsigned int disksig)
 188{
 189        ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 190        dos_partition_t *pt;
 191        int i;
 192        int dos_type;
 193
 194        if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
 195                printf ("** Can't read partition table on %d:" LBAFU " **\n",
 196                        dev_desc->devnum, ext_part_sector);
 197                return -1;
 198        }
 199        if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
 200                buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
 201                printf ("bad MBR sector signature 0x%02x%02x\n",
 202                        buffer[DOS_PART_MAGIC_OFFSET],
 203                        buffer[DOS_PART_MAGIC_OFFSET + 1]);
 204                return -1;
 205        }
 206
 207#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 208        if (!ext_part_sector)
 209                disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
 210#endif
 211
 212        /* Print all primary/logical partitions */
 213        pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 214        for (i = 0; i < 4; i++, pt++) {
 215                /*
 216                 * fdisk does not show the extended partitions that
 217                 * are not in the MBR
 218                 */
 219                if (((pt->boot_ind & ~0x80) == 0) &&
 220                    (pt->sys_ind != 0) &&
 221                    (part_num == which_part) &&
 222                    (ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) {
 223                        info->blksz = DOS_PART_DEFAULT_SECTOR;
 224                        info->start = (lbaint_t)(ext_part_sector +
 225                                        le32_to_int(pt->start4));
 226                        info->size  = (lbaint_t)le32_to_int(pt->size4);
 227                        part_set_generic_name(dev_desc, part_num,
 228                                              (char *)info->name);
 229                        /* sprintf(info->type, "%d, pt->sys_ind); */
 230                        strcpy((char *)info->type, "U-Boot");
 231                        info->bootable = is_bootable(pt);
 232#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 233                        sprintf(info->uuid, "%08x-%02x", disksig, part_num);
 234#endif
 235                        info->sys_ind = pt->sys_ind;
 236                        return 0;
 237                }
 238
 239                /* Reverse engr the fdisk part# assignment rule! */
 240                if ((ext_part_sector == 0) ||
 241                    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
 242                        part_num++;
 243                }
 244        }
 245
 246        /* Follows the extended partitions */
 247        pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 248        for (i = 0; i < 4; i++, pt++) {
 249                if (is_extended (pt->sys_ind)) {
 250                        lbaint_t lba_start
 251                                = le32_to_int (pt->start4) + relative;
 252
 253                        return part_get_info_extended(dev_desc, lba_start,
 254                                 ext_part_sector == 0 ? lba_start : relative,
 255                                 part_num, which_part, info, disksig);
 256                }
 257        }
 258
 259        /* Check for DOS PBR if no partition is found */
 260        dos_type = test_block_type(buffer);
 261
 262        if (dos_type == DOS_PBR) {
 263                info->start = 0;
 264                info->size = dev_desc->lba;
 265                info->blksz = DOS_PART_DEFAULT_SECTOR;
 266                info->bootable = 0;
 267                strcpy((char *)info->type, "U-Boot");
 268#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 269                info->uuid[0] = 0;
 270#endif
 271                return 0;
 272        }
 273
 274        return -1;
 275}
 276
 277void part_print_dos(struct blk_desc *dev_desc)
 278{
 279        printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
 280        print_partition_extended(dev_desc, 0, 0, 1, 0);
 281}
 282
 283int part_get_info_dos(struct blk_desc *dev_desc, int part,
 284                      disk_partition_t *info)
 285{
 286        return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
 287}
 288
 289int is_valid_dos_buf(void *buf)
 290{
 291        return test_block_type(buf) == DOS_MBR ? 0 : -1;
 292}
 293
 294int write_mbr_partition(struct blk_desc *dev_desc, void *buf)
 295{
 296        if (is_valid_dos_buf(buf))
 297                return -1;
 298
 299        /* write MBR */
 300        if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
 301                printf("%s: failed writing '%s' (1 blks at 0x0)\n",
 302                       __func__, "MBR");
 303                return 1;
 304        }
 305
 306        return 0;
 307}
 308
 309U_BOOT_PART_TYPE(dos) = {
 310        .name           = "DOS",
 311        .part_type      = PART_TYPE_DOS,
 312        .max_entries    = DOS_ENTRY_NUMBERS,
 313        .get_info       = part_get_info_ptr(part_get_info_dos),
 314        .print          = part_print_ptr(part_print_dos),
 315        .test           = part_test_dos,
 316};
 317
 318#endif
 319