include/part.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * (C) Copyright 2000-2004
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6 #ifndef _PART_H
   7 #define _PART_H
   8
   9 #include <blk.h>
  10 #include <ide.h>
  11 #include <uuid.h>
  12 #include <linker_lists.h>
  13 #include <linux/errno.h>
  14 #include <linux/list.h>
  15
  16 struct block_drvr {
  17         char *name;
  18         int (*select_hwpart)(int dev_num, int hwpart);
  19 };
  20
  21 #define LOG2(x) (((x & 0xaaaaaaaa) ? 1 : 0) + ((x & 0xcccccccc) ? 2 : 0) + \
  22                  ((x & 0xf0f0f0f0) ? 4 : 0) + ((x & 0xff00ff00) ? 8 : 0) + \
  23                  ((x & 0xffff0000) ? 16 : 0))
  24 #define LOG2_INVALID(type) ((type)((sizeof(type)<<3)-1))
  25
  26 /* Part types */
  27 #define PART_TYPE_UNKNOWN       0x00
  28 #define PART_TYPE_MAC           0x01
  29 #define PART_TYPE_DOS           0x02
  30 #define PART_TYPE_ISO           0x03
  31 #define PART_TYPE_AMIGA         0x04
  32 #define PART_TYPE_EFI           0x05
  33
  34 /* maximum number of partition entries supported by search */
  35 #define DOS_ENTRY_NUMBERS       8
  36 #define ISO_ENTRY_NUMBERS       64
  37 #define MAC_ENTRY_NUMBERS       64
  38 #define AMIGA_ENTRY_NUMBERS     8
  39 /*
  40  * Type string for U-Boot bootable partitions
  41  */
  42 #define BOOT_PART_TYPE  "U-Boot"        /* primary boot partition type  */
  43 #define BOOT_PART_COMP  "PPCBoot"       /* PPCBoot compatibility type   */
  44
  45 /* device types */
  46 #define DEV_TYPE_UNKNOWN        0xff    /* not connected */
  47 #define DEV_TYPE_HARDDISK       0x00    /* harddisk */
  48 #define DEV_TYPE_TAPE           0x01    /* Tape */
  49 #define DEV_TYPE_CDROM          0x05    /* CD-ROM */
  50 #define DEV_TYPE_OPDISK         0x07    /* optical disk */
  51
  52 #define PART_NAME_LEN 32
  53 #define PART_TYPE_LEN 32
  54 #define MAX_SEARCH_PARTITIONS 128
  55
  56 #define PART_BOOTABLE                   ((int)BIT(0))
  57 #define PART_EFI_SYSTEM_PARTITION       ((int)BIT(1))
  58
  59 struct disk_partition {
  60         lbaint_t        start;  /* # of first block in partition        */
  61         lbaint_t        size;   /* number of blocks in partition        */
  62         ulong   blksz;          /* block size in bytes                  */
  63         uchar   name[PART_NAME_LEN];    /* partition name                       */
  64         uchar   type[PART_TYPE_LEN];    /* string type description              */
  65         /*
  66          * The bootable is a bitmask with the following fields:
  67          *
  68          * PART_BOOTABLE                the MBR bootable flag is set
  69          * PART_EFI_SYSTEM_PARTITION    the partition is an EFI system partition
  70          */
  71         int     bootable;
  72 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
  73         char    uuid[UUID_STR_LEN + 1]; /* filesystem UUID as string, if exists */
  74 #endif
  75 #ifdef CONFIG_PARTITION_TYPE_GUID
  76         char    type_guid[UUID_STR_LEN + 1];    /* type GUID as string, if exists       */
  77 #endif
  78 #ifdef CONFIG_DOS_PARTITION
  79         uchar   sys_ind;        /* partition type                       */
  80 #endif
  81 };
  82
  83 /* Accessors for struct disk_partition field ->uuid */
  84 extern char *__invalid_use_of_disk_partition_uuid;
  85
  86 static inline const char *disk_partition_uuid(const struct disk_partition *info)
  87 {
  88 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
  89         return info->uuid;
  90 #else
  91         return __invalid_use_of_disk_partition_uuid;
  92 #endif
  93 }
  94
  95 static inline void disk_partition_set_uuid(struct disk_partition *info,
  96                                            const char *val)
  97 {
  98 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
  99         strlcpy(info->uuid, val, UUID_STR_LEN + 1);
 100 #endif
 101 }
 102
 103 static inline void disk_partition_clr_uuid(struct disk_partition *info)
 104 {
 105 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 106         *info->uuid = '\0';
 107 #endif
 108 }
 109
 110 /* Accessors for struct disk_partition field ->type_guid */
 111 extern char *__invalid_use_of_disk_partition_type_guid;
 112
 113 /**
 114  * disk_partition_type_guid() - get partition type GUID
 115  *
 116  * By using this function to get the partition type GUID we can use
 117  * 'if (IS_ENABLED(CONFIG_PARTITION_TYPE_GUID))' instead of
 118  * '#ifdef CONFIG_PARTITION_TYPE_GUID'.
 119  *
 120  * @info:       partition information
 121  * Return:      partition type GUID
 122  */
 123 static inline const
 124 char *disk_partition_type_guid(const struct disk_partition *info)
 125 {
 126 #ifdef CONFIG_PARTITION_TYPE_GUID
 127         return info->type_guid;
 128 #else
 129         return __invalid_use_of_disk_partition_type_guid;
 130 #endif
 131 }
 132
 133 /**
 134  * disk_partition_set_type_guid() - set partition type GUID
 135  *
 136  * By using this function to set the partition type GUID we can use
 137  * 'if (IS_ENABLED(CONFIG_PARTITION_TYPE_GUID))' instead of
 138  * '#ifdef CONFIG_PARTITION_TYPE_GUID'.
 139  *
 140  * @info:       partition information
 141  * @val:        partition type GUID as string
 142  */
 143 static inline void disk_partition_set_type_guid(struct disk_partition *info,
 144                                                 const char *val)
 145 {
 146 #ifdef CONFIG_PARTITION_TYPE_GUID
 147         strlcpy(info->type_guid, val, UUID_STR_LEN + 1);
 148 #endif
 149 }
 150
 151 static inline void disk_partition_clr_type_guid(struct disk_partition *info)
 152 {
 153 #ifdef CONFIG_PARTITION_TYPE_GUID
 154         *info->type_guid = '\0';
 155 #endif
 156 }
 157
 158 /* Accessors for struct disk_partition field ->sys_ind */
 159 extern int __invalid_use_of_disk_partition_sys_ind;
 160
 161 static inline uint disk_partition_sys_ind(const struct disk_partition *info)
 162 {
 163 #ifdef CONFIG_DOS_PARTITION
 164         return info->sys_ind;
 165 #else
 166         return __invalid_use_of_disk_partition_sys_ind;
 167 #endif
 168 }
 169
 170 struct disk_part {
 171         int partnum;
 172         struct disk_partition gpt_part_info;
 173         struct list_head list;
 174 };
 175
 176 /* Misc _get_dev functions */
 177 #if CONFIG_IS_ENABLED(PARTITIONS)
 178 /**
 179  * blk_get_dev() - get a pointer to a block device given its type and number
 180  *
 181  * Each interface allocates its own devices and typically struct blk_desc is
 182  * contained with the interface's data structure. There is no global
 183  * numbering for block devices, so the interface name must be provided.
 184  *
 185  * @ifname:     Interface name (e.g. "ide", "scsi")
 186  * @dev:        Device number (0 for first device on that interface, 1 for
 187  *              second, etc.
 188  * Return:
 189  * pointer to the block device, or NULL if not available, or an error occurred.
 190  */
 191 struct blk_desc *blk_get_dev(const char *ifname, int dev);
 192
 193 struct blk_desc *mg_disk_get_dev(int dev);
 194
 195 /**
 196  * part_get_info_by_type() - Get partitions from a block device using a specific
 197  * partition driver
 198  *
 199  * Each interface allocates its own devices and typically struct blk_desc is
 200  * contained with the interface's data structure. There is no global
 201  * numbering for block devices, so the interface name must be provided.
 202  *
 203  * @desc:       Block device descriptor
 204  * @part:       Partition number to read
 205  * @part_type:  Partition driver to use, or PART_TYPE_UNKNOWN to automatically
 206  *              choose a driver
 207  * @info:       Returned partition information
 208  *
 209  * Return: 0 on success, negative errno on failure
 210  */
 211 int part_get_info_by_type(struct blk_desc *desc, int part, int part_type,
 212                           struct disk_partition *info);
 213 int part_get_info(struct blk_desc *desc, int part,
 214                   struct disk_partition *info);
 215 /**
 216  * part_get_info_whole_disk() - get partition info for the special case of
 217  * a partition occupying the entire disk.
 218  *
 219  * @desc:       block device descriptor
 220  * @info:       returned partition information
 221  * Return:      0 on success
 222  */
 223 int part_get_info_whole_disk(struct blk_desc *desc,
 224                              struct disk_partition *info);
 225
 226 void part_print(struct blk_desc *desc);
 227 void part_init(struct blk_desc *desc);
 228 void dev_print(struct blk_desc *desc);
 229
 230 /**
 231  * blk_get_device_by_str() - Get a block device given its interface/hw partition
 232  *
 233  * Each interface allocates its own devices and typically struct blk_desc is
 234  * contained with the interface's data structure. There is no global
 235  * numbering for block devices, so the interface name must be provided.
 236  *
 237  * The hardware parition is not related to the normal software partitioning
 238  * of a device - each hardware partition is effectively a separately
 239  * accessible block device. When a hardware parition is selected on MMC the
 240  * other hardware partitions become inaccessible. The same block device is
 241  * used to access all hardware partitions, but its capacity may change when a
 242  * different hardware partition is selected.
 243  *
 244  * When a hardware partition number is given, the block device switches to
 245  * that hardware partition.
 246  *
 247  * @ifname:     Interface name (e.g. "ide", "scsi")
 248  * @dev_str:    Device and optional hw partition. This can either be a string
 249  *              containing the device number (e.g. "2") or the device number
 250  *              and hardware partition number (e.g. "2.4") for devices that
 251  *              support it (currently only MMC).
 252  * @desc:       Returns a pointer to the block device on success
 253  * Return: block device number (local to the interface), or -1 on error
 254  */
 255 int blk_get_device_by_str(const char *ifname, const char *dev_str,
 256                           struct blk_desc **desc);
 257
 258 /**
 259  * blk_get_device_part_str() - Get a block device and partition
 260  *
 261  * This calls blk_get_device_by_str() to look up a device. It also looks up
 262  * a partition and returns information about it.
 263  *
 264  * @dev_part_str is in the format <dev>.<hw_part>:<part> where
 265  *
 266  * * <dev> is the device number,
 267  *
 268  * * <hw_part> is the optional hardware partition number and
 269  *
 270  * * <part> is the partition number.
 271  *
 272  * If @ifname is "hostfs", then this function returns the sandbox host block
 273  * device.
 274  *
 275  * If @ifname is "ubi", then this function returns 0, with @info set to a
 276  * special UBI device.
 277  *
 278  * If @dev_part_str is NULL or empty or "-", then this function looks up
 279  * the "bootdevice" environment variable and uses that string instead.
 280  *
 281  * If the partition string is empty then the first partition is used. If the
 282  * partition string is "auto" then the first bootable partition is used.
 283  *
 284  * @ifname:             Interface name (e.g. "ide", "scsi")
 285  * @dev_part_str:       Device and partition string
 286  * @desc:               Returns a pointer to the block device on success
 287  * @info:               Returns partition information
 288  * @allow_whole_dev:    true to allow the user to select partition 0
 289  *                      (which means the whole device), false to require a valid
 290  *                      partition number >= 1
 291  * Return: partition number, or -1 on error
 292  *
 293  */
 294 int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
 295                             struct blk_desc **desc,
 296                             struct disk_partition *info, int allow_whole_dev);
 297
 298 /**
 299  * part_get_info_by_name() - Search for a partition by name
 300  *                           among all available registered partitions
 301  *
 302  * @desc:       block device descriptor
 303  * @name:       the specified table entry name
 304  * @info:       returns the disk partition info
 305  *
 306  * Return: the partition number on match (starting on 1), -1 on no match,
 307  * otherwise error
 308  */
 309 int part_get_info_by_name(struct blk_desc *desc, const char *name,
 310                           struct disk_partition *info);
 311
 312 /**
 313  * part_get_info_by_dev_and_name_or_num() - Get partition info from dev number
 314  *                                          and part name, or dev number and
 315  *                                          part number.
 316  *
 317  * Parse a device number and partition description (either name or number)
 318  * in the form of device number plus partition name separated by a "#"
 319  * (like "device_num#partition_name") or a device number plus a partition number
 320  * separated by a ":". For example both "0#misc" and "0:1" can be valid
 321  * partition descriptions for a given interface. If the partition is found, sets
 322  * desc and part_info accordingly with the information of the partition.
 323  *
 324  * @dev_iface:          Device interface
 325  * @dev_part_str:       Input partition description, like "0#misc" or "0:1"
 326  * @desc:               Place to store the device description pointer
 327  * @part_info:          Place to store the partition information
 328  * @allow_whole_dev:    true to allow the user to select partition 0
 329  *                      (which means the whole device), false to require a valid
 330  *                      partition number >= 1
 331  * Return:      the partition number on success, or negative errno on error
 332  */
 333 int part_get_info_by_dev_and_name_or_num(const char *dev_iface,
 334                                          const char *dev_part_str,
 335                                          struct blk_desc **desc,
 336                                          struct disk_partition *part_info,
 337                                          int allow_whole_dev);
 338
 339 /**
 340  * part_set_generic_name() - create generic partition like hda1 or sdb2
 341  *
 342  * Helper function for partition tables, which don't hold partition names
 343  * (DOS, ISO). Generates partition name out of the device type and partition
 344  * number.
 345  *
 346  * @desc:       pointer to the block device
 347  * @part_num:   partition number for which the name is generated
 348  * @name:       buffer where the name is written
 349  */
 350 void part_set_generic_name(const struct blk_desc *desc, int part_num,
 351                            char *name);
 352
 353 extern const struct block_drvr block_drvr[];
 354 #else
 355 static inline struct blk_desc *blk_get_dev(const char *ifname, int dev)
 356 { return NULL; }
 357 static inline struct blk_desc *mg_disk_get_dev(int dev) { return NULL; }
 358
 359 static inline int part_get_info(struct blk_desc *desc, int part,
 360                                 struct disk_partition *info) { return -1; }
 361 static inline int part_get_info_whole_disk(struct blk_desc *desc,
 362                                            struct disk_partition *info)
 363 { return -1; }
 364 static inline void part_print(struct blk_desc *desc) {}
 365 static inline void part_init(struct blk_desc *desc) {}
 366 static inline void dev_print(struct blk_desc *desc) {}
 367 static inline int blk_get_device_by_str(const char *ifname, const char *dev_str,
 368                                         struct blk_desc **desc)
 369 { return -1; }
 370 static inline int blk_get_device_part_str(const char *ifname,
 371                                           const char *dev_part_str,
 372                                           struct blk_desc **desc,
 373                                           struct disk_partition *info,
 374                                           int allow_whole_dev)
 375 { *desc = NULL; return -1; }
 376
 377 static inline int part_get_info_by_name(struct blk_desc *desc, const char *name,
 378                                         struct disk_partition *info)
 379 {
 380         return -ENOENT;
 381 }
 382
 383 static inline int
 384 part_get_info_by_dev_and_name_or_num(const char *dev_iface,
 385                                      const char *dev_part_str,
 386                                      struct blk_desc **desc,
 387                                      struct disk_partition *part_info,
 388                                      int allow_whole_dev)
 389 {
 390         *desc = NULL;
 391         return -ENOSYS;
 392 }
 393 #endif
 394
 395 struct udevice;
 396 /**
 397  * disk_blk_read() - read blocks from a disk partition
 398  *
 399  * @dev:        Device to read from (UCLASS_PARTITION)
 400  * @start:      Start block number to read in the partition (0=first)
 401  * @blkcnt:     Number of blocks to read
 402  * @buffer:     Destination buffer for data read
 403  * Return:      number of blocks read, or -ve error number (see the
 404  * IS_ERR_VALUE() macro
 405  */
 406 ulong disk_blk_read(struct udevice *dev, lbaint_t start, lbaint_t blkcnt,
 407                     void *buffer);
 408
 409 /**
 410  * disk_blk_write() - write to a disk partition
 411  *
 412  * @dev:        Device to write to (UCLASS_PARTITION)
 413  * @start:      Start block number to write in the partition (0=first)
 414  * @blkcnt:     Number of blocks to write
 415  * @buffer:     Source buffer for data to write
 416  * Return:      number of blocks written, or -ve error number (see the
 417  * IS_ERR_VALUE() macro
 418  */
 419 ulong disk_blk_write(struct udevice *dev, lbaint_t start, lbaint_t blkcnt,
 420                      const void *buffer);
 421
 422 /**
 423  * disk_blk_erase() - erase a section of a disk partition
 424  *
 425  * @dev:        Device to (partially) erase (UCLASS_PARTITION)
 426  * @start:      Start block number to erase in the partition (0=first)
 427  * @blkcnt:     Number of blocks to erase
 428  * Return:      number of blocks erased, or -ve error number (see the
 429  * IS_ERR_VALUE() macro
 430  */
 431 ulong disk_blk_erase(struct udevice *dev, lbaint_t start, lbaint_t blkcnt);
 432
 433 /*
 434  * We don't support printing partition information in SPL and only support
 435  * getting partition information in a few cases.
 436  */
 437 #ifdef CONFIG_SPL_BUILD
 438 # define part_print_ptr(x)      NULL
 439 # if defined(CONFIG_SPL_FS_EXT4) || defined(CONFIG_SPL_FS_FAT) || \
 440         defined(CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION)
 441 #  define part_get_info_ptr(x)  x
 442 # else
 443 #  define part_get_info_ptr(x)  NULL
 444 # endif
 445 #else
 446 #define part_print_ptr(x)       x
 447 #define part_get_info_ptr(x)    x
 448 #endif
 449
 450 /**
 451  * struct part_driver - partition driver
 452  */
 453 struct part_driver {
 454         /** @name:      partition name */
 455         const char *name;
 456         /** @part_type: (MBR) partition type */
 457         int part_type;
 458         /** @max_entries:       maximum number of partition table entries */
 459         const int max_entries;
 460         /**
 461          * @get_info:           Get information about a partition
 462          *
 463          * @get_info.desc:      Block device descriptor
 464          * @get_info.part:      Partition number (1 = first)
 465          * @get_info.info:      Returns partition information
 466          */
 467         int (*get_info)(struct blk_desc *desc, int part,
 468                         struct disk_partition *info);
 469
 470         /**
 471          * @print:              Print partition information
 472          *
 473          * @print.desc: Block device descriptor
 474          */
 475         void (*print)(struct blk_desc *desc);
 476
 477         /**
 478          * @test:               Test if a device contains this partition type
 479          *
 480          * @test.desc:          Block device descriptor
 481          * @test.Return:
 482          * 0 if the block device appears to contain this partition type,
 483          * -ve if not
 484          */
 485         int (*test)(struct blk_desc *desc);
 486 };
 487
 488 /* Declare a new U-Boot partition 'driver' */
 489 #define U_BOOT_PART_TYPE(__name)                                        \
 490         ll_entry_declare(struct part_driver, __name, part_driver)
 491
 492 #include <part_efi.h>
 493
 494 #if CONFIG_IS_ENABLED(EFI_PARTITION)
 495 /* disk/part_efi.c */
 496 /**
 497  * write_gpt_table() - Write the GUID Partition Table to disk
 498  *
 499  * @desc:       block device descriptor
 500  * @gpt_h:      pointer to GPT header representation
 501  * @gpt_e:      pointer to GPT partition table entries
 502  *
 503  * Return:      zero on success, otherwise error
 504  */
 505 int write_gpt_table(struct blk_desc *desc, gpt_header *gpt_h, gpt_entry *gpt_e);
 506
 507 /**
 508  * gpt_fill_pte() - Fill the GPT partition table entry
 509  *
 510  * @desc:       block device descriptor
 511  * @gpt_h:      GPT header representation
 512  * @gpt_e:      GPT partition table entries
 513  * @partitions: list of partitions
 514  * @parts:      number of partitions
 515  *
 516  * Return:      zero on success
 517  */
 518 int gpt_fill_pte(struct blk_desc *desc, gpt_header *gpt_h, gpt_entry *gpt_e,
 519                  struct disk_partition *partitions, int parts);
 520
 521 /**
 522  * gpt_fill_header() - Fill the GPT header
 523  *
 524  * @desc:               block device descriptor
 525  * @gpt_h:              GPT header representation
 526  * @str_guid:           disk guid string representation
 527  * @parts_count:        number of partitions
 528  *
 529  * Return:              error on str_guid conversion error
 530  */
 531 int gpt_fill_header(struct blk_desc *desc, gpt_header *gpt_h, char *str_guid,
 532                     int parts_count);
 533
 534 /**
 535  * gpt_restore() - Restore GPT partition table
 536  *
 537  * @desc:               block device descriptor
 538  * @str_disk_guid:      disk GUID
 539  * @partitions:         list of partitions
 540  * @parts_count:        number of partitions
 541  *
 542  * Return:              0 on success
 543  */
 544 int gpt_restore(struct blk_desc *desc, char *str_disk_guid,
 545                 struct disk_partition *partitions, const int parts_count);
 546
 547 /**
 548  * is_valid_gpt_buf() - Ensure that the Primary GPT information is valid
 549  *
 550  * @desc:       block device descriptor
 551  * @buf:        buffer which contains the MBR and Primary GPT info
 552  *
 553  * Return:      0 on success, otherwise error
 554  */
 555 int is_valid_gpt_buf(struct blk_desc *desc, void *buf);
 556
 557 /**
 558  * write_mbr_and_gpt_partitions() - write MBR, Primary GPT and Backup GPT
 559  *
 560  * @desc:       block device descriptor
 561  * @buf:        buffer which contains the MBR and Primary GPT info
 562  *
 563  * Return:      0 on success, otherwise error
 564  */
 565 int write_mbr_and_gpt_partitions(struct blk_desc *desc, void *buf);
 566
 567 /**
 568  * gpt_verify_headers() - Read and check CRC32 of the GPT's header
 569  *                        and partition table entries (PTE)
 570  *
 571  * As a side effect if sets gpt_head and gpt_pte so they point to GPT data.
 572  *
 573  * @desc:       block device descriptor
 574  * @gpt_head:   pointer to GPT header data read from medium
 575  * @gpt_pte:    pointer to GPT partition table enties read from medium
 576  *
 577  * Return:      0 on success, otherwise error
 578  */
 579 int gpt_verify_headers(struct blk_desc *desc, gpt_header *gpt_head,
 580                        gpt_entry **gpt_pte);
 581
 582 /**
 583  * gpt_repair_headers() - Function to repair the GPT's header
 584  *                        and partition table entries (PTE)
 585  *
 586  * @desc:       block device descriptor
 587  *
 588  * Return:      0 on success, otherwise error
 589  */
 590 int gpt_repair_headers(struct blk_desc *desc);
 591
 592 /**
 593  * gpt_verify_partitions() - Function to check if partitions' name, start and
 594  *                           size correspond to '$partitions' env variable
 595  *
 596  * This function checks if on medium stored GPT data is in sync with information
 597  * provided in '$partitions' environment variable. Specificially, name, start
 598  * and size of the partition is checked.
 599  *
 600  * @desc:       block device descriptor
 601  * @partitions: partition data read from '$partitions' env variable
 602  * @parts:      number of partitions read from '$partitions' env variable
 603  * @gpt_head:   pointer to GPT header data read from medium
 604  * @gpt_pte:    pointer to GPT partition table enties read from medium
 605  *
 606  * Return:      0 on success, otherwise error
 607  */
 608 int gpt_verify_partitions(struct blk_desc *desc,
 609                           struct disk_partition *partitions, int parts,
 610                           gpt_header *gpt_head, gpt_entry **gpt_pte);
 611
 612
 613 /**
 614  * get_disk_guid() - Read the GUID string from a device's GPT
 615  *
 616  * This function reads the GUID string from a block device whose descriptor
 617  * is provided.
 618  *
 619  * @desc:       block device descriptor
 620  * @guid:       pre-allocated string in which to return the GUID
 621  *
 622  * Return:      0 on success, otherwise error
 623  */
 624 int get_disk_guid(struct blk_desc *desc, char *guid);
 625
 626 #endif
 627
 628 #if CONFIG_IS_ENABLED(DOS_PARTITION)
 629 /**
 630  * is_valid_dos_buf() - Ensure that a DOS MBR image is valid
 631  *
 632  * @buf:        buffer which contains the MBR
 633  *
 634  * Return:      0 on success, otherwise error
 635  */
 636 int is_valid_dos_buf(void *buf);
 637
 638 /**
 639  * write_mbr_sector() - write DOS MBR
 640  *
 641  * @desc:       block device descriptor
 642  * @buf:        buffer which contains the MBR
 643  *
 644  * Return:      0 on success, otherwise error
 645  */
 646 int write_mbr_sector(struct blk_desc *desc, void *buf);
 647
 648 int write_mbr_partitions(struct blk_desc *dev,
 649                 struct disk_partition *p, int count, unsigned int disksig);
 650 int layout_mbr_partitions(struct disk_partition *p, int count,
 651                           lbaint_t total_sectors);
 652
 653 #endif
 654
 655 #if CONFIG_IS_ENABLED(PARTITIONS)
 656 /**
 657  * part_driver_get_count() - get partition driver count
 658  *
 659  * Return:      number of partition drivers
 660  */
 661 static inline int part_driver_get_count(void)
 662 {
 663         return ll_entry_count(struct part_driver, part_driver);
 664 }
 665
 666 /**
 667  * part_driver_get_first() - get first partition driver
 668  *
 669  * Return:      pointer to first partition driver on success, otherwise NULL
 670  */
 671 static inline struct part_driver *part_driver_get_first(void)
 672 {
 673         return ll_entry_start(struct part_driver, part_driver);
 674 }
 675
 676 /**
 677  * part_get_type_by_name() - Get partition type by name
 678  *
 679  * @name:       Name of partition type to look up (not case-sensitive)
 680  * Return:
 681  * Corresponding partition type (PART\_TYPE\_...) or PART\_TYPE\_UNKNOWN
 682  */
 683 int part_get_type_by_name(const char *name);
 684
 685 /**
 686  * part_get_bootable() - Find the first bootable partition
 687  *
 688  * @desc:       Block-device descriptor
 689  * Return:      first bootable partition, or 0 if there is none
 690  */
 691 int part_get_bootable(struct blk_desc *desc);
 692
 693 #else
 694 static inline int part_driver_get_count(void)
 695 { return 0; }
 696
 697 static inline struct part_driver *part_driver_get_first(void)
 698 { return NULL; }
 699
 700 static inline bool part_get_bootable(struct blk_desc *desc)
 701 { return false; }
 702
 703 #endif /* CONFIG_PARTITIONS */
 704
 705 #endif /* _PART_H */