| /* |
| * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg |
| * |
| * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6 |
| * 2003-03-10 - kharris@nexus-tech.net - ported to u-boot |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #ifndef _FAT_H_ |
| #define _FAT_H_ |
| |
| #include <asm/byteorder.h> |
| |
| #define CONFIG_SUPPORT_VFAT |
| /* Maximum Long File Name length supported here is 128 UTF-16 code units */ |
| #define VFAT_MAXLEN_BYTES 256 /* Maximum LFN buffer in bytes */ |
| #define VFAT_MAXSEQ 9 /* Up to 9 of 13 2-byte UTF-16 entries */ |
| #define PREFETCH_BLOCKS 2 |
| |
| #ifndef CONFIG_FS_FAT_MAX_CLUSTSIZE |
| #define CONFIG_FS_FAT_MAX_CLUSTSIZE 65536 |
| #endif |
| #define MAX_CLUSTSIZE CONFIG_FS_FAT_MAX_CLUSTSIZE |
| |
| #define DIRENTSPERBLOCK (mydata->sect_size / sizeof(dir_entry)) |
| #define DIRENTSPERCLUST (((__u32)mydata->clust_size * mydata->sect_size) / \ |
| sizeof(dir_entry)) |
| |
| #define FATBUFBLOCKS 6 |
| #define FATBUFSIZE (mydata->sect_size * FATBUFBLOCKS) |
| #define FAT12BUFSIZE ((FATBUFSIZE*2)/3) |
| #define FAT16BUFSIZE (FATBUFSIZE/2) |
| #define FAT32BUFSIZE (FATBUFSIZE/4) |
| |
| |
| /* Filesystem identifiers */ |
| #define FAT12_SIGN "FAT12 " |
| #define FAT16_SIGN "FAT16 " |
| #define FAT32_SIGN "FAT32 " |
| #define SIGNLEN 8 |
| |
| /* File attributes */ |
| #define ATTR_RO 1 |
| #define ATTR_HIDDEN 2 |
| #define ATTR_SYS 4 |
| #define ATTR_VOLUME 8 |
| #define ATTR_DIR 16 |
| #define ATTR_ARCH 32 |
| |
| #define ATTR_VFAT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) |
| |
| #define DELETED_FLAG ((char)0xe5) /* Marks deleted files when in name[0] */ |
| #define aRING 0x05 /* Used as special character in name[0] */ |
| |
| /* |
| * Indicates that the entry is the last long entry in a set of long |
| * dir entries |
| */ |
| #define LAST_LONG_ENTRY_MASK 0x40 |
| |
| /* Flags telling whether we should read a file or list a directory */ |
| #define LS_NO 0 |
| #define LS_YES 1 |
| #define LS_DIR 1 |
| #define LS_ROOT 2 |
| |
| #define ISDIRDELIM(c) ((c) == '/' || (c) == '\\') |
| |
| #define FSTYPE_NONE (-1) |
| |
| #if defined(__linux__) && defined(__KERNEL__) |
| #define FAT2CPU16 le16_to_cpu |
| #define FAT2CPU32 le32_to_cpu |
| #else |
| #if __LITTLE_ENDIAN |
| #define FAT2CPU16(x) (x) |
| #define FAT2CPU32(x) (x) |
| #else |
| #define FAT2CPU16(x) ((((x) & 0x00ff) << 8) | (((x) & 0xff00) >> 8)) |
| #define FAT2CPU32(x) ((((x) & 0x000000ff) << 24) | \ |
| (((x) & 0x0000ff00) << 8) | \ |
| (((x) & 0x00ff0000) >> 8) | \ |
| (((x) & 0xff000000) >> 24)) |
| #endif |
| #endif |
| |
| #define START(dent) (FAT2CPU16((dent)->start) \ |
| + (mydata->fatsize != 32 ? 0 : \ |
| (FAT2CPU16((dent)->starthi) << 16))) |
| #define IS_LAST_CLUST(x, fatsize) ((x) >= ((fatsize) != 32 ? \ |
| ((fatsize) != 16 ? 0xff8 : 0xfff8) : \ |
| 0xffffff8)) |
| #define CHECK_CLUST(x, fatsize) ((x) <= 1 || \ |
| (x) >= ((fatsize) != 32 ? \ |
| ((fatsize) != 16 ? 0xff0 : 0xfff0) : \ |
| 0xffffff0)) |
| |
| typedef struct boot_sector { |
| __u8 ignored[3]; /* Bootstrap code */ |
| char system_id[8]; /* Name of fs */ |
| __u8 sector_size[2]; /* Bytes/sector */ |
| __u8 cluster_size; /* Sectors/cluster */ |
| __u16 reserved; /* Number of reserved sectors */ |
| __u8 fats; /* Number of FATs */ |
| __u8 dir_entries[2]; /* Number of root directory entries */ |
| __u8 sectors[2]; /* Number of sectors */ |
| __u8 media; /* Media code */ |
| __u16 fat_length; /* Sectors/FAT */ |
| __u16 secs_track; /* Sectors/track */ |
| __u16 heads; /* Number of heads */ |
| __u32 hidden; /* Number of hidden sectors */ |
| __u32 total_sect; /* Number of sectors (if sectors == 0) */ |
| |
| /* FAT32 only */ |
| __u32 fat32_length; /* Sectors/FAT */ |
| __u16 flags; /* Bit 8: fat mirroring, low 4: active fat */ |
| __u8 version[2]; /* Filesystem version */ |
| __u32 root_cluster; /* First cluster in root directory */ |
| __u16 info_sector; /* Filesystem info sector */ |
| __u16 backup_boot; /* Backup boot sector */ |
| __u16 reserved2[6]; /* Unused */ |
| } boot_sector; |
| |
| typedef struct volume_info |
| { |
| __u8 drive_number; /* BIOS drive number */ |
| __u8 reserved; /* Unused */ |
| __u8 ext_boot_sign; /* 0x29 if fields below exist (DOS 3.3+) */ |
| __u8 volume_id[4]; /* Volume ID number */ |
| char volume_label[11]; /* Volume label */ |
| char fs_type[8]; /* Typically FAT12, FAT16, or FAT32 */ |
| /* Boot code comes next, all but 2 bytes to fill up sector */ |
| /* Boot sign comes last, 2 bytes */ |
| } volume_info; |
| |
| typedef struct dir_entry { |
| char name[8],ext[3]; /* Name and extension */ |
| __u8 attr; /* Attribute bits */ |
| __u8 lcase; /* Case for base and extension */ |
| __u8 ctime_ms; /* Creation time, milliseconds */ |
| __u16 ctime; /* Creation time */ |
| __u16 cdate; /* Creation date */ |
| __u16 adate; /* Last access date */ |
| __u16 starthi; /* High 16 bits of cluster in FAT32 */ |
| __u16 time,date,start;/* Time, date and first cluster */ |
| __u32 size; /* File size in bytes */ |
| } dir_entry; |
| |
| typedef struct dir_slot { |
| __u8 id; /* Sequence number for slot */ |
| __u8 name0_4[10]; /* First 5 characters in name */ |
| __u8 attr; /* Attribute byte */ |
| __u8 reserved; /* Unused */ |
| __u8 alias_checksum;/* Checksum for 8.3 alias */ |
| __u8 name5_10[12]; /* 6 more characters in name */ |
| __u16 start; /* Unused */ |
| __u8 name11_12[4]; /* Last 2 characters in name */ |
| } dir_slot; |
| |
| /* |
| * Private filesystem parameters |
| * |
| * Note: FAT buffer has to be 32 bit aligned |
| * (see FAT32 accesses) |
| */ |
| typedef struct { |
| __u8 *fatbuf; /* Current FAT buffer */ |
| int fatsize; /* Size of FAT in bits */ |
| __u32 fatlength; /* Length of FAT in sectors */ |
| __u16 fat_sect; /* Starting sector of the FAT */ |
| __u32 rootdir_sect; /* Start sector of root directory */ |
| __u16 sect_size; /* Size of sectors in bytes */ |
| __u16 clust_size; /* Size of clusters in sectors */ |
| int data_begin; /* The sector of the first cluster, can be negative */ |
| int fatbufnum; /* Used by get_fatent, init to -1 */ |
| } fsdata; |
| |
| typedef int (file_detectfs_func)(void); |
| typedef int (file_ls_func)(const char *dir); |
| typedef int (file_read_func)(const char *filename, void *buffer, |
| int maxsize); |
| |
| struct filesystem { |
| file_detectfs_func *detect; |
| file_ls_func *ls; |
| file_read_func *read; |
| const char name[12]; |
| }; |
| |
| /* FAT tables */ |
| file_detectfs_func file_fat_detectfs; |
| file_ls_func file_fat_ls; |
| file_read_func file_fat_read; |
| |
| /* Currently this doesn't check if the dir exists or is valid... */ |
| int file_cd(const char *path); |
| int file_fat_detectfs(void); |
| int file_fat_ls(const char *dir); |
| int fat_exists(const char *filename); |
| int fat_size(const char *filename, loff_t *size); |
| int file_fat_read_at(const char *filename, loff_t pos, void *buffer, |
| loff_t maxsize, loff_t *actread); |
| int file_fat_read(const char *filename, void *buffer, int maxsize); |
| const char *file_getfsname(int idx); |
| int fat_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info); |
| int fat_register_device(block_dev_desc_t *dev_desc, int part_no); |
| |
| int file_fat_write(const char *filename, void *buf, loff_t offset, loff_t len, |
| loff_t *actwrite); |
| int fat_read_file(const char *filename, void *buf, loff_t offset, loff_t len, |
| loff_t *actread); |
| void fat_close(void); |
| #endif /* _FAT_H_ */ |