include/part.h

   1 /*
   2  * (C) Copyright 2000-2004
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7 #ifndef _PART_H
   8 #define _PART_H
   9
  10 #include <blk.h>
  11 #include <ide.h>
  12
  13 struct block_drvr {
  14         char *name;
  15         int (*select_hwpart)(int dev_num, int hwpart);
  16 };
  17
  18 #define LOG2(x) (((x & 0xaaaaaaaa) ? 1 : 0) + ((x & 0xcccccccc) ? 2 : 0) + \
  19                  ((x & 0xf0f0f0f0) ? 4 : 0) + ((x & 0xff00ff00) ? 8 : 0) + \
  20                  ((x & 0xffff0000) ? 16 : 0))
  21 #define LOG2_INVALID(type) ((type)((sizeof(type)<<3)-1))
  22
  23 /* Part types */
  24 #define PART_TYPE_UNKNOWN       0x00
  25 #define PART_TYPE_MAC           0x01
  26 #define PART_TYPE_DOS           0x02
  27 #define PART_TYPE_ISO           0x03
  28 #define PART_TYPE_AMIGA         0x04
  29 #define PART_TYPE_EFI           0x05
  30
  31 /* maximum number of partition entries supported by search */
  32 #define DOS_ENTRY_NUMBERS       8
  33 #define ISO_ENTRY_NUMBERS       64
  34 #define MAC_ENTRY_NUMBERS       64
  35 #define AMIGA_ENTRY_NUMBERS     8
  36 /*
  37  * Type string for U-Boot bootable partitions
  38  */
  39 #define BOOT_PART_TYPE  "U-Boot"        /* primary boot partition type  */
  40 #define BOOT_PART_COMP  "PPCBoot"       /* PPCBoot compatibility type   */
  41
  42 /* device types */
  43 #define DEV_TYPE_UNKNOWN        0xff    /* not connected */
  44 #define DEV_TYPE_HARDDISK       0x00    /* harddisk */
  45 #define DEV_TYPE_TAPE           0x01    /* Tape */
  46 #define DEV_TYPE_CDROM          0x05    /* CD-ROM */
  47 #define DEV_TYPE_OPDISK         0x07    /* optical disk */
  48
  49 typedef struct disk_partition {
  50         lbaint_t        start;  /* # of first block in partition        */
  51         lbaint_t        size;   /* number of blocks in partition        */
  52         ulong   blksz;          /* block size in bytes                  */
  53         uchar   name[32];       /* partition name                       */
  54         uchar   type[32];       /* string type description              */
  55         int     bootable;       /* Active/Bootable flag is set          */
  56 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
  57         char    uuid[37];       /* filesystem UUID as string, if exists */
  58 #endif
  59 #ifdef CONFIG_PARTITION_TYPE_GUID
  60         char    type_guid[37];  /* type GUID as string, if exists       */
  61 #endif
  62 } disk_partition_t;
  63
  64 /* Misc _get_dev functions */
  65 #ifdef CONFIG_PARTITIONS
  66 /**
  67  * blk_get_dev() - get a pointer to a block device given its type and number
  68  *
  69  * Each interface allocates its own devices and typically struct blk_desc is
  70  * contained with the interface's data structure. There is no global
  71  * numbering for block devices, so the interface name must be provided.
  72  *
  73  * @ifname:     Interface name (e.g. "ide", "scsi")
  74  * @dev:        Device number (0 for first device on that interface, 1 for
  75  *              second, etc.
  76  * @return pointer to the block device, or NULL if not available, or an
  77  *         error occurred.
  78  */
  79 struct blk_desc *blk_get_dev(const char *ifname, int dev);
  80
  81 struct blk_desc *mg_disk_get_dev(int dev);
  82 int host_get_dev_err(int dev, struct blk_desc **blk_devp);
  83
  84 /* disk/part.c */
  85 int part_get_info(struct blk_desc *dev_desc, int part, disk_partition_t *info);
  86 void part_print(struct blk_desc *dev_desc);
  87 void part_init(struct blk_desc *dev_desc);
  88 void dev_print(struct blk_desc *dev_desc);
  89
  90 /**
  91  * blk_get_device_by_str() - Get a block device given its interface/hw partition
  92  *
  93  * Each interface allocates its own devices and typically struct blk_desc is
  94  * contained with the interface's data structure. There is no global
  95  * numbering for block devices, so the interface name must be provided.
  96  *
  97  * The hardware parition is not related to the normal software partitioning
  98  * of a device - each hardware partition is effectively a separately
  99  * accessible block device. When a hardware parition is selected on MMC the
 100  * other hardware partitions become inaccessible. The same block device is
 101  * used to access all hardware partitions, but its capacity may change when a
 102  * different hardware partition is selected.
 103  *
 104  * When a hardware partition number is given, the block device switches to
 105  * that hardware partition.
 106  *
 107  * @ifname:     Interface name (e.g. "ide", "scsi")
 108  * @dev_str:    Device and optional hw partition. This can either be a string
 109  *              containing the device number (e.g. "2") or the device number
 110  *              and hardware partition number (e.g. "2.4") for devices that
 111  *              support it (currently only MMC).
 112  * @dev_desc:   Returns a pointer to the block device on success
 113  * @return block device number (local to the interface), or -1 on error
 114  */
 115 int blk_get_device_by_str(const char *ifname, const char *dev_str,
 116                           struct blk_desc **dev_desc);
 117
 118 /**
 119  * blk_get_device_part_str() - Get a block device and partition
 120  *
 121  * This calls blk_get_device_by_str() to look up a device. It also looks up
 122  * a partition and returns information about it.
 123  *
 124  * @dev_part_str is in the format:
 125  *      <dev>.<hw_part>:<part> where <dev> is the device number,
 126  *      <hw_part> is the optional hardware partition number and
 127  *      <part> is the partition number
 128  *
 129  * If ifname is "hostfs" then this function returns the sandbox host block
 130  * device.
 131  *
 132  * If ifname is ubi, then this function returns 0, with @info set to a
 133  * special UBI device.
 134  *
 135  * If @dev_part_str is NULL or empty or "-", then this function looks up
 136  * the "bootdevice" environment variable and uses that string instead.
 137  *
 138  * If the partition string is empty then the first partition is used. If the
 139  * partition string is "auto" then the first bootable partition is used.
 140  *
 141  * @ifname:     Interface name (e.g. "ide", "scsi")
 142  * @dev_part_str:       Device and partition string
 143  * @dev_desc:   Returns a pointer to the block device on success
 144  * @info:       Returns partition information
 145  * @allow_whole_dev:    true to allow the user to select partition 0
 146  *              (which means the whole device), false to require a valid
 147  *              partition number >= 1
 148  * @return partition number, or -1 on error
 149  *
 150  */
 151 int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
 152                             struct blk_desc **dev_desc,
 153                             disk_partition_t *info, int allow_whole_dev);
 154
 155 /**
 156  * part_get_info_by_name() - Search for a partition by name
 157  *                           among all available registered partitions
 158  *
 159  * @param dev_desc - block device descriptor
 160  * @param gpt_name - the specified table entry name
 161  * @param info - returns the disk partition info
 162  *
 163  * @return - '0' on match, '-1' on no match, otherwise error
 164  */
 165 int part_get_info_by_name(struct blk_desc *dev_desc,
 166                               const char *name, disk_partition_t *info);
 167
 168 /**
 169  * part_set_generic_name() - create generic partition like hda1 or sdb2
 170  *
 171  * Helper function for partition tables, which don't hold partition names
 172  * (DOS, ISO). Generates partition name out of the device type and partition
 173  * number.
 174  *
 175  * @dev_desc:   pointer to the block device
 176  * @part_num:   partition number for which the name is generated
 177  * @name:       buffer where the name is written
 178  */
 179 void part_set_generic_name(const struct blk_desc *dev_desc,
 180         int part_num, char *name);
 181
 182 extern const struct block_drvr block_drvr[];
 183 #else
 184 static inline struct blk_desc *blk_get_dev(const char *ifname, int dev)
 185 { return NULL; }
 186 static inline struct blk_desc *mg_disk_get_dev(int dev) { return NULL; }
 187
 188 static inline int part_get_info(struct blk_desc *dev_desc, int part,
 189                                 disk_partition_t *info) { return -1; }
 190 static inline void part_print(struct blk_desc *dev_desc) {}
 191 static inline void part_init(struct blk_desc *dev_desc) {}
 192 static inline void dev_print(struct blk_desc *dev_desc) {}
 193 static inline int blk_get_device_by_str(const char *ifname, const char *dev_str,
 194                                         struct blk_desc **dev_desc)
 195 { return -1; }
 196 static inline int blk_get_device_part_str(const char *ifname,
 197                                            const char *dev_part_str,
 198                                            struct blk_desc **dev_desc,
 199                                            disk_partition_t *info,
 200                                            int allow_whole_dev)
 201 { *dev_desc = NULL; return -1; }
 202 #endif
 203
 204 /*
 205  * We don't support printing partition information in SPL and only support
 206  * getting partition information in a few cases.
 207  */
 208 #ifdef CONFIG_SPL_BUILD
 209 # define part_print_ptr(x)      NULL
 210 # if defined(CONFIG_SPL_EXT_SUPPORT) || defined(CONFIG_SPL_FAT_SUPPORT) || \
 211         defined(CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION)
 212 #  define part_get_info_ptr(x)  x
 213 # else
 214 #  define part_get_info_ptr(x)  NULL
 215 # endif
 216 #else
 217 #define part_print_ptr(x)       x
 218 #define part_get_info_ptr(x)    x
 219 #endif
 220
 221
 222 struct part_driver {
 223         const char *name;
 224         int part_type;
 225         const int max_entries;  /* maximum number of entries to search */
 226
 227         /**
 228          * get_info() - Get information about a partition
 229          *
 230          * @dev_desc:   Block device descriptor
 231          * @part:       Partition number (1 = first)
 232          * @info:       Returns partition information
 233          */
 234         int (*get_info)(struct blk_desc *dev_desc, int part,
 235                         disk_partition_t *info);
 236
 237         /**
 238          * print() - Print partition information
 239          *
 240          * @dev_desc:   Block device descriptor
 241          */
 242         void (*print)(struct blk_desc *dev_desc);
 243
 244         /**
 245          * test() - Test if a device contains this partition type
 246          *
 247          * @dev_desc:   Block device descriptor
 248          * @return 0 if the block device appears to contain this partition
 249          *         type, -ve if not
 250          */
 251         int (*test)(struct blk_desc *dev_desc);
 252 };
 253
 254 /* Declare a new U-Boot partition 'driver' */
 255 #define U_BOOT_PART_TYPE(__name)                                        \
 256         ll_entry_declare(struct part_driver, __name, part_driver)
 257
 258 #if CONFIG_IS_ENABLED(EFI_PARTITION)
 259 #include <part_efi.h>
 260 /* disk/part_efi.c */
 261 /**
 262  * write_gpt_table() - Write the GUID Partition Table to disk
 263  *
 264  * @param dev_desc - block device descriptor
 265  * @param gpt_h - pointer to GPT header representation
 266  * @param gpt_e - pointer to GPT partition table entries
 267  *
 268  * @return - zero on success, otherwise error
 269  */
 270 int write_gpt_table(struct blk_desc *dev_desc,
 271                   gpt_header *gpt_h, gpt_entry *gpt_e);
 272
 273 /**
 274  * gpt_fill_pte(): Fill the GPT partition table entry
 275  *
 276  * @param gpt_h - GPT header representation
 277  * @param gpt_e - GPT partition table entries
 278  * @param partitions - list of partitions
 279  * @param parts - number of partitions
 280  *
 281  * @return zero on success
 282  */
 283 int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e,
 284                 disk_partition_t *partitions, int parts);
 285
 286 /**
 287  * gpt_fill_header(): Fill the GPT header
 288  *
 289  * @param dev_desc - block device descriptor
 290  * @param gpt_h - GPT header representation
 291  * @param str_guid - disk guid string representation
 292  * @param parts_count - number of partitions
 293  *
 294  * @return - error on str_guid conversion error
 295  */
 296 int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h,
 297                 char *str_guid, int parts_count);
 298
 299 /**
 300  * gpt_restore(): Restore GPT partition table
 301  *
 302  * @param dev_desc - block device descriptor
 303  * @param str_disk_guid - disk GUID
 304  * @param partitions - list of partitions
 305  * @param parts - number of partitions
 306  *
 307  * @return zero on success
 308  */
 309 int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
 310                 disk_partition_t *partitions, const int parts_count);
 311
 312 /**
 313  * is_valid_gpt_buf() - Ensure that the Primary GPT information is valid
 314  *
 315  * @param dev_desc - block device descriptor
 316  * @param buf - buffer which contains the MBR and Primary GPT info
 317  *
 318  * @return - '0' on success, otherwise error
 319  */
 320 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf);
 321
 322 /**
 323  * write_mbr_and_gpt_partitions() - write MBR, Primary GPT and Backup GPT
 324  *
 325  * @param dev_desc - block device descriptor
 326  * @param buf - buffer which contains the MBR and Primary GPT info
 327  *
 328  * @return - '0' on success, otherwise error
 329  */
 330 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf);
 331
 332 /**
 333  * gpt_verify_headers() - Function to read and CRC32 check of the GPT's header
 334  *                        and partition table entries (PTE)
 335  *
 336  * As a side effect if sets gpt_head and gpt_pte so they point to GPT data.
 337  *
 338  * @param dev_desc - block device descriptor
 339  * @param gpt_head - pointer to GPT header data read from medium
 340  * @param gpt_pte - pointer to GPT partition table enties read from medium
 341  *
 342  * @return - '0' on success, otherwise error
 343  */
 344 int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
 345                        gpt_entry **gpt_pte);
 346
 347 /**
 348  * gpt_verify_partitions() - Function to check if partitions' name, start and
 349  *                           size correspond to '$partitions' env variable
 350  *
 351  * This function checks if on medium stored GPT data is in sync with information
 352  * provided in '$partitions' environment variable. Specificially, name, start
 353  * and size of the partition is checked.
 354  *
 355  * @param dev_desc - block device descriptor
 356  * @param partitions - partition data read from '$partitions' env variable
 357  * @param parts - number of partitions read from '$partitions' env variable
 358  * @param gpt_head - pointer to GPT header data read from medium
 359  * @param gpt_pte - pointer to GPT partition table enties read from medium
 360  *
 361  * @return - '0' on success, otherwise error
 362  */
 363 int gpt_verify_partitions(struct blk_desc *dev_desc,
 364                           disk_partition_t *partitions, int parts,
 365                           gpt_header *gpt_head, gpt_entry **gpt_pte);
 366 #endif
 367
 368 #if CONFIG_IS_ENABLED(DOS_PARTITION)
 369 /**
 370  * is_valid_dos_buf() - Ensure that a DOS MBR image is valid
 371  *
 372  * @param buf - buffer which contains the MBR
 373  *
 374  * @return - '0' on success, otherwise error
 375  */
 376 int is_valid_dos_buf(void *buf);
 377
 378 /**
 379  * write_mbr_partition() - write DOS MBR
 380  *
 381  * @param dev_desc - block device descriptor
 382  * @param buf - buffer which contains the MBR
 383  *
 384  * @return - '0' on success, otherwise error
 385  */
 386 int write_mbr_partition(struct blk_desc *dev_desc, void *buf);
 387
 388 #endif
 389
 390
 391 #endif /* _PART_H */