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 <linux/list.h>
  13
  14 struct block_drvr {
  15         char *name;
  16         int (*select_hwpart)(int dev_num, int hwpart);
  17 };
  18
  19 #define LOG2(x) (((x & 0xaaaaaaaa) ? 1 : 0) + ((x & 0xcccccccc) ? 2 : 0) + \
  20                  ((x & 0xf0f0f0f0) ? 4 : 0) + ((x & 0xff00ff00) ? 8 : 0) + \
  21                  ((x & 0xffff0000) ? 16 : 0))
  22 #define LOG2_INVALID(type) ((type)((sizeof(type)<<3)-1))
  23
  24 /* Part types */
  25 #define PART_TYPE_UNKNOWN       0x00
  26 #define PART_TYPE_MAC           0x01
  27 #define PART_TYPE_DOS           0x02
  28 #define PART_TYPE_ISO           0x03
  29 #define PART_TYPE_AMIGA         0x04
  30 #define PART_TYPE_EFI           0x05
  31
  32 /* maximum number of partition entries supported by search */
  33 #define DOS_ENTRY_NUMBERS       8
  34 #define ISO_ENTRY_NUMBERS       64
  35 #define MAC_ENTRY_NUMBERS       64
  36 #define AMIGA_ENTRY_NUMBERS     8
  37 /*
  38  * Type string for U-Boot bootable partitions
  39  */
  40 #define BOOT_PART_TYPE  "U-Boot"        /* primary boot partition type  */
  41 #define BOOT_PART_COMP  "PPCBoot"       /* PPCBoot compatibility type   */
  42
  43 /* device types */
  44 #define DEV_TYPE_UNKNOWN        0xff    /* not connected */
  45 #define DEV_TYPE_HARDDISK       0x00    /* harddisk */
  46 #define DEV_TYPE_TAPE           0x01    /* Tape */
  47 #define DEV_TYPE_CDROM          0x05    /* CD-ROM */
  48 #define DEV_TYPE_OPDISK         0x07    /* optical disk */
  49
  50 #define PART_NAME_LEN 32
  51 #define PART_TYPE_LEN 32
  52 #define MAX_SEARCH_PARTITIONS 64
  53
  54 typedef struct disk_partition {
  55         lbaint_t        start;  /* # of first block in partition        */
  56         lbaint_t        size;   /* number of blocks in partition        */
  57         ulong   blksz;          /* block size in bytes                  */
  58         uchar   name[PART_NAME_LEN];    /* partition name                       */
  59         uchar   type[PART_TYPE_LEN];    /* string type description              */
  60         int     bootable;       /* Active/Bootable flag is set          */
  61 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
  62         char    uuid[UUID_STR_LEN + 1]; /* filesystem UUID as string, if exists */
  63 #endif
  64 #ifdef CONFIG_PARTITION_TYPE_GUID
  65         char    type_guid[UUID_STR_LEN + 1];    /* type GUID as string, if exists       */
  66 #endif
  67 #ifdef CONFIG_DOS_PARTITION
  68         uchar   sys_ind;        /* partition type                       */
  69 #endif
  70 } disk_partition_t;
  71
  72 struct disk_part {
  73         int partnum;
  74         disk_partition_t gpt_part_info;
  75         struct list_head list;
  76 };
  77
  78 /* Misc _get_dev functions */
  79 #ifdef CONFIG_PARTITIONS
  80 /**
  81  * blk_get_dev() - get a pointer to a block device given its type and number
  82  *
  83  * Each interface allocates its own devices and typically struct blk_desc is
  84  * contained with the interface's data structure. There is no global
  85  * numbering for block devices, so the interface name must be provided.
  86  *
  87  * @ifname:     Interface name (e.g. "ide", "scsi")
  88  * @dev:        Device number (0 for first device on that interface, 1 for
  89  *              second, etc.
  90  * @return pointer to the block device, or NULL if not available, or an
  91  *         error occurred.
  92  */
  93 struct blk_desc *blk_get_dev(const char *ifname, int dev);
  94
  95 struct blk_desc *mg_disk_get_dev(int dev);
  96 int host_get_dev_err(int dev, struct blk_desc **blk_devp);
  97
  98 /* disk/part.c */
  99 int part_get_info(struct blk_desc *dev_desc, int part, disk_partition_t *info);
 100 /**
 101  * part_get_info_whole_disk() - get partition info for the special case of
 102  * a partition occupying the entire disk.
 103  */
 104 int part_get_info_whole_disk(struct blk_desc *dev_desc, disk_partition_t *info);
 105
 106 void part_print(struct blk_desc *dev_desc);
 107 void part_init(struct blk_desc *dev_desc);
 108 void dev_print(struct blk_desc *dev_desc);
 109
 110 /**
 111  * blk_get_device_by_str() - Get a block device given its interface/hw partition
 112  *
 113  * Each interface allocates its own devices and typically struct blk_desc is
 114  * contained with the interface's data structure. There is no global
 115  * numbering for block devices, so the interface name must be provided.
 116  *
 117  * The hardware parition is not related to the normal software partitioning
 118  * of a device - each hardware partition is effectively a separately
 119  * accessible block device. When a hardware parition is selected on MMC the
 120  * other hardware partitions become inaccessible. The same block device is
 121  * used to access all hardware partitions, but its capacity may change when a
 122  * different hardware partition is selected.
 123  *
 124  * When a hardware partition number is given, the block device switches to
 125  * that hardware partition.
 126  *
 127  * @ifname:     Interface name (e.g. "ide", "scsi")
 128  * @dev_str:    Device and optional hw partition. This can either be a string
 129  *              containing the device number (e.g. "2") or the device number
 130  *              and hardware partition number (e.g. "2.4") for devices that
 131  *              support it (currently only MMC).
 132  * @dev_desc:   Returns a pointer to the block device on success
 133  * @return block device number (local to the interface), or -1 on error
 134  */
 135 int blk_get_device_by_str(const char *ifname, const char *dev_str,
 136                           struct blk_desc **dev_desc);
 137
 138 /**
 139  * blk_get_device_part_str() - Get a block device and partition
 140  *
 141  * This calls blk_get_device_by_str() to look up a device. It also looks up
 142  * a partition and returns information about it.
 143  *
 144  * @dev_part_str is in the format:
 145  *      <dev>.<hw_part>:<part> where <dev> is the device number,
 146  *      <hw_part> is the optional hardware partition number and
 147  *      <part> is the partition number
 148  *
 149  * If ifname is "hostfs" then this function returns the sandbox host block
 150  * device.
 151  *
 152  * If ifname is ubi, then this function returns 0, with @info set to a
 153  * special UBI device.
 154  *
 155  * If @dev_part_str is NULL or empty or "-", then this function looks up
 156  * the "bootdevice" environment variable and uses that string instead.
 157  *
 158  * If the partition string is empty then the first partition is used. If the
 159  * partition string is "auto" then the first bootable partition is used.
 160  *
 161  * @ifname:     Interface name (e.g. "ide", "scsi")
 162  * @dev_part_str:       Device and partition string
 163  * @dev_desc:   Returns a pointer to the block device on success
 164  * @info:       Returns partition information
 165  * @allow_whole_dev:    true to allow the user to select partition 0
 166  *              (which means the whole device), false to require a valid
 167  *              partition number >= 1
 168  * @return partition number, or -1 on error
 169  *
 170  */
 171 int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
 172                             struct blk_desc **dev_desc,
 173                             disk_partition_t *info, int allow_whole_dev);
 174
 175 /**
 176  * part_get_info_by_name_type() - Search for a partition by name
 177  *                                for only specified partition type
 178  *
 179  * @param dev_desc - block device descriptor
 180  * @param gpt_name - the specified table entry name
 181  * @param info - returns the disk partition info
 182  * @param part_type - only search in partitions of this type
 183  *
 184  * @return - the partition number on match (starting on 1), -1 on no match,
 185  * otherwise error
 186  */
 187 int part_get_info_by_name_type(struct blk_desc *dev_desc, const char *name,
 188                                disk_partition_t *info, int part_type);
 189
 190 /**
 191  * part_get_info_by_name() - Search for a partition by name
 192  *                           among all available registered partitions
 193  *
 194  * @param dev_desc - block device descriptor
 195  * @param gpt_name - the specified table entry name
 196  * @param info - returns the disk partition info
 197  *
 198  * @return - the partition number on match (starting on 1), -1 on no match,
 199  * otherwise error
 200  */
 201 int part_get_info_by_name(struct blk_desc *dev_desc,
 202                               const char *name, disk_partition_t *info);
 203
 204 /**
 205  * Get partition info from dev number + part name, or dev number + part number.
 206  *
 207  * Parse a device number and partition description (either name or number)
 208  * in the form of device number plus partition name separated by a "#"
 209  * (like "device_num#partition_name") or a device number plus a partition number
 210  * separated by a ":". For example both "0#misc" and "0:1" can be valid
 211  * partition descriptions for a given interface. If the partition is found, sets
 212  * dev_desc and part_info accordingly with the information of the partition.
 213  *
 214  * @param[in] dev_iface Device interface
 215  * @param[in] dev_part_str Input partition description, like "0#misc" or "0:1"
 216  * @param[out] dev_desc Place to store the device description pointer
 217  * @param[out] part_info Place to store the partition information
 218  * @return 0 on success, or a negative on error
 219  */
 220 int part_get_info_by_dev_and_name_or_num(const char *dev_iface,
 221                                          const char *dev_part_str,
 222                                          struct blk_desc **dev_desc,
 223                                          disk_partition_t *part_info);
 224
 225 /**
 226  * part_set_generic_name() - create generic partition like hda1 or sdb2
 227  *
 228  * Helper function for partition tables, which don't hold partition names
 229  * (DOS, ISO). Generates partition name out of the device type and partition
 230  * number.
 231  *
 232  * @dev_desc:   pointer to the block device
 233  * @part_num:   partition number for which the name is generated
 234  * @name:       buffer where the name is written
 235  */
 236 void part_set_generic_name(const struct blk_desc *dev_desc,
 237         int part_num, char *name);
 238
 239 extern const struct block_drvr block_drvr[];
 240 #else
 241 static inline struct blk_desc *blk_get_dev(const char *ifname, int dev)
 242 { return NULL; }
 243 static inline struct blk_desc *mg_disk_get_dev(int dev) { return NULL; }
 244
 245 static inline int part_get_info(struct blk_desc *dev_desc, int part,
 246                                 disk_partition_t *info) { return -1; }
 247 static inline int part_get_info_whole_disk(struct blk_desc *dev_desc,
 248                                            disk_partition_t *info)
 249 { return -1; }
 250 static inline void part_print(struct blk_desc *dev_desc) {}
 251 static inline void part_init(struct blk_desc *dev_desc) {}
 252 static inline void dev_print(struct blk_desc *dev_desc) {}
 253 static inline int blk_get_device_by_str(const char *ifname, const char *dev_str,
 254                                         struct blk_desc **dev_desc)
 255 { return -1; }
 256 static inline int blk_get_device_part_str(const char *ifname,
 257                                            const char *dev_part_str,
 258                                            struct blk_desc **dev_desc,
 259                                            disk_partition_t *info,
 260                                            int allow_whole_dev)
 261 { *dev_desc = NULL; return -1; }
 262 #endif
 263
 264 /*
 265  * We don't support printing partition information in SPL and only support
 266  * getting partition information in a few cases.
 267  */
 268 #ifdef CONFIG_SPL_BUILD
 269 # define part_print_ptr(x)      NULL
 270 # if defined(CONFIG_SPL_FS_EXT4) || defined(CONFIG_SPL_FS_FAT) || \
 271         defined(CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION)
 272 #  define part_get_info_ptr(x)  x
 273 # else
 274 #  define part_get_info_ptr(x)  NULL
 275 # endif
 276 #else
 277 #define part_print_ptr(x)       x
 278 #define part_get_info_ptr(x)    x
 279 #endif
 280
 281
 282 struct part_driver {
 283         const char *name;
 284         int part_type;
 285         const int max_entries;  /* maximum number of entries to search */
 286
 287         /**
 288          * get_info() - Get information about a partition
 289          *
 290          * @dev_desc:   Block device descriptor
 291          * @part:       Partition number (1 = first)
 292          * @info:       Returns partition information
 293          */
 294         int (*get_info)(struct blk_desc *dev_desc, int part,
 295                         disk_partition_t *info);
 296
 297         /**
 298          * print() - Print partition information
 299          *
 300          * @dev_desc:   Block device descriptor
 301          */
 302         void (*print)(struct blk_desc *dev_desc);
 303
 304         /**
 305          * test() - Test if a device contains this partition type
 306          *
 307          * @dev_desc:   Block device descriptor
 308          * @return 0 if the block device appears to contain this partition
 309          *         type, -ve if not
 310          */
 311         int (*test)(struct blk_desc *dev_desc);
 312 };
 313
 314 /* Declare a new U-Boot partition 'driver' */
 315 #define U_BOOT_PART_TYPE(__name)                                        \
 316         ll_entry_declare(struct part_driver, __name, part_driver)
 317
 318 #include <part_efi.h>
 319
 320 #if CONFIG_IS_ENABLED(EFI_PARTITION)
 321 /* disk/part_efi.c */
 322 /**
 323  * write_gpt_table() - Write the GUID Partition Table to disk
 324  *
 325  * @param dev_desc - block device descriptor
 326  * @param gpt_h - pointer to GPT header representation
 327  * @param gpt_e - pointer to GPT partition table entries
 328  *
 329  * @return - zero on success, otherwise error
 330  */
 331 int write_gpt_table(struct blk_desc *dev_desc,
 332                   gpt_header *gpt_h, gpt_entry *gpt_e);
 333
 334 /**
 335  * gpt_fill_pte(): Fill the GPT partition table entry
 336  *
 337  * @param dev_desc - block device descriptor
 338  * @param gpt_h - GPT header representation
 339  * @param gpt_e - GPT partition table entries
 340  * @param partitions - list of partitions
 341  * @param parts - number of partitions
 342  *
 343  * @return zero on success
 344  */
 345 int gpt_fill_pte(struct blk_desc *dev_desc,
 346                  gpt_header *gpt_h, gpt_entry *gpt_e,
 347                  disk_partition_t *partitions, int parts);
 348
 349 /**
 350  * gpt_fill_header(): Fill the GPT header
 351  *
 352  * @param dev_desc - block device descriptor
 353  * @param gpt_h - GPT header representation
 354  * @param str_guid - disk guid string representation
 355  * @param parts_count - number of partitions
 356  *
 357  * @return - error on str_guid conversion error
 358  */
 359 int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h,
 360                 char *str_guid, int parts_count);
 361
 362 /**
 363  * gpt_restore(): Restore GPT partition table
 364  *
 365  * @param dev_desc - block device descriptor
 366  * @param str_disk_guid - disk GUID
 367  * @param partitions - list of partitions
 368  * @param parts - number of partitions
 369  *
 370  * @return zero on success
 371  */
 372 int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
 373                 disk_partition_t *partitions, const int parts_count);
 374
 375 /**
 376  * is_valid_gpt_buf() - Ensure that the Primary GPT information is valid
 377  *
 378  * @param dev_desc - block device descriptor
 379  * @param buf - buffer which contains the MBR and Primary GPT info
 380  *
 381  * @return - '0' on success, otherwise error
 382  */
 383 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf);
 384
 385 /**
 386  * write_mbr_and_gpt_partitions() - write MBR, Primary GPT and Backup GPT
 387  *
 388  * @param dev_desc - block device descriptor
 389  * @param buf - buffer which contains the MBR and Primary GPT info
 390  *
 391  * @return - '0' on success, otherwise error
 392  */
 393 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf);
 394
 395 /**
 396  * gpt_verify_headers() - Function to read and CRC32 check of the GPT's header
 397  *                        and partition table entries (PTE)
 398  *
 399  * As a side effect if sets gpt_head and gpt_pte so they point to GPT data.
 400  *
 401  * @param dev_desc - block device descriptor
 402  * @param gpt_head - pointer to GPT header data read from medium
 403  * @param gpt_pte - pointer to GPT partition table enties read from medium
 404  *
 405  * @return - '0' on success, otherwise error
 406  */
 407 int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
 408                        gpt_entry **gpt_pte);
 409
 410 /**
 411  * gpt_verify_partitions() - Function to check if partitions' name, start and
 412  *                           size correspond to '$partitions' env variable
 413  *
 414  * This function checks if on medium stored GPT data is in sync with information
 415  * provided in '$partitions' environment variable. Specificially, name, start
 416  * and size of the partition is checked.
 417  *
 418  * @param dev_desc - block device descriptor
 419  * @param partitions - partition data read from '$partitions' env variable
 420  * @param parts - number of partitions read from '$partitions' env variable
 421  * @param gpt_head - pointer to GPT header data read from medium
 422  * @param gpt_pte - pointer to GPT partition table enties read from medium
 423  *
 424  * @return - '0' on success, otherwise error
 425  */
 426 int gpt_verify_partitions(struct blk_desc *dev_desc,
 427                           disk_partition_t *partitions, int parts,
 428                           gpt_header *gpt_head, gpt_entry **gpt_pte);
 429
 430
 431 /**
 432  * get_disk_guid() - Function to read the GUID string from a device's GPT
 433  *
 434  * This function reads the GUID string from a block device whose descriptor
 435  * is provided.
 436  *
 437  * @param dev_desc - block device descriptor
 438  * @param guid - pre-allocated string in which to return the GUID
 439  *
 440  * @return - '0' on success, otherwise error
 441  */
 442 int get_disk_guid(struct blk_desc *dev_desc, char *guid);
 443
 444 #endif
 445
 446 #if CONFIG_IS_ENABLED(DOS_PARTITION)
 447 /**
 448  * is_valid_dos_buf() - Ensure that a DOS MBR image is valid
 449  *
 450  * @param buf - buffer which contains the MBR
 451  *
 452  * @return - '0' on success, otherwise error
 453  */
 454 int is_valid_dos_buf(void *buf);
 455
 456 /**
 457  * write_mbr_partition() - write DOS MBR
 458  *
 459  * @param dev_desc - block device descriptor
 460  * @param buf - buffer which contains the MBR
 461  *
 462  * @return - '0' on success, otherwise error
 463  */
 464 int write_mbr_partition(struct blk_desc *dev_desc, void *buf);
 465
 466 #endif
 467
 468
 469 #endif /* _PART_H */