1 /* 2 * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg 3 * 4 * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6 5 * 2003-03-10 - kharris@nexus-tech.net - ported to u-boot 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #ifndef _FAT_H_ 11 #define _FAT_H_ 12 13 #include <asm/byteorder.h> 14 15 #define CONFIG_SUPPORT_VFAT 16 /* Maximum Long File Name length supported here is 128 UTF-16 code units */ 17 #define VFAT_MAXLEN_BYTES 256 /* Maximum LFN buffer in bytes */ 18 #define VFAT_MAXSEQ 9 /* Up to 9 of 13 2-byte UTF-16 entries */ 19 #define PREFETCH_BLOCKS 2 20 21 #define MAX_CLUSTSIZE 65536 22 #define DIRENTSPERBLOCK (mydata->sect_size / sizeof(dir_entry)) 23 #define DIRENTSPERCLUST ((mydata->clust_size * mydata->sect_size) / \ 24 sizeof(dir_entry)) 25 26 #define FATBUFBLOCKS 6 27 #define FATBUFSIZE (mydata->sect_size * FATBUFBLOCKS) 28 #define FAT12BUFSIZE ((FATBUFSIZE*2)/3) 29 #define FAT16BUFSIZE (FATBUFSIZE/2) 30 #define FAT32BUFSIZE (FATBUFSIZE/4) 31 32 33 /* Filesystem identifiers */ 34 #define FAT12_SIGN "FAT12 " 35 #define FAT16_SIGN "FAT16 " 36 #define FAT32_SIGN "FAT32 " 37 #define SIGNLEN 8 38 39 /* File attributes */ 40 #define ATTR_RO 1 41 #define ATTR_HIDDEN 2 42 #define ATTR_SYS 4 43 #define ATTR_VOLUME 8 44 #define ATTR_DIR 16 45 #define ATTR_ARCH 32 46 47 #define ATTR_VFAT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) 48 49 #define DELETED_FLAG ((char)0xe5) /* Marks deleted files when in name[0] */ 50 #define aRING 0x05 /* Used as special character in name[0] */ 51 52 /* 53 * Indicates that the entry is the last long entry in a set of long 54 * dir entries 55 */ 56 #define LAST_LONG_ENTRY_MASK 0x40 57 58 /* Flags telling whether we should read a file or list a directory */ 59 #define LS_NO 0 60 #define LS_YES 1 61 #define LS_DIR 1 62 #define LS_ROOT 2 63 64 #define ISDIRDELIM(c) ((c) == '/' || (c) == '\\') 65 66 #define FSTYPE_NONE (-1) 67 68 #if defined(__linux__) && defined(__KERNEL__) 69 #define FAT2CPU16 le16_to_cpu 70 #define FAT2CPU32 le32_to_cpu 71 #else 72 #if __LITTLE_ENDIAN 73 #define FAT2CPU16(x) (x) 74 #define FAT2CPU32(x) (x) 75 #else 76 #define FAT2CPU16(x) ((((x) & 0x00ff) << 8) | (((x) & 0xff00) >> 8)) 77 #define FAT2CPU32(x) ((((x) & 0x000000ff) << 24) | \ 78 (((x) & 0x0000ff00) << 8) | \ 79 (((x) & 0x00ff0000) >> 8) | \ 80 (((x) & 0xff000000) >> 24)) 81 #endif 82 #endif 83 84 #define START(dent) (FAT2CPU16((dent)->start) \ 85 + (mydata->fatsize != 32 ? 0 : \ 86 (FAT2CPU16((dent)->starthi) << 16))) 87 #define IS_LAST_CLUST(x, fatsize) ((x) >= ((fatsize) != 32 ? \ 88 ((fatsize) != 16 ? 0xff8 : 0xfff8) : \ 89 0xffffff8)) 90 #define CHECK_CLUST(x, fatsize) ((x) <= 1 || \ 91 (x) >= ((fatsize) != 32 ? \ 92 ((fatsize) != 16 ? 0xff0 : 0xfff0) : \ 93 0xffffff0)) 94 95 typedef struct boot_sector { 96 __u8 ignored[3]; /* Bootstrap code */ 97 char system_id[8]; /* Name of fs */ 98 __u8 sector_size[2]; /* Bytes/sector */ 99 __u8 cluster_size; /* Sectors/cluster */ 100 __u16 reserved; /* Number of reserved sectors */ 101 __u8 fats; /* Number of FATs */ 102 __u8 dir_entries[2]; /* Number of root directory entries */ 103 __u8 sectors[2]; /* Number of sectors */ 104 __u8 media; /* Media code */ 105 __u16 fat_length; /* Sectors/FAT */ 106 __u16 secs_track; /* Sectors/track */ 107 __u16 heads; /* Number of heads */ 108 __u32 hidden; /* Number of hidden sectors */ 109 __u32 total_sect; /* Number of sectors (if sectors == 0) */ 110 111 /* FAT32 only */ 112 __u32 fat32_length; /* Sectors/FAT */ 113 __u16 flags; /* Bit 8: fat mirroring, low 4: active fat */ 114 __u8 version[2]; /* Filesystem version */ 115 __u32 root_cluster; /* First cluster in root directory */ 116 __u16 info_sector; /* Filesystem info sector */ 117 __u16 backup_boot; /* Backup boot sector */ 118 __u16 reserved2[6]; /* Unused */ 119 } boot_sector; 120 121 typedef struct volume_info 122 { 123 __u8 drive_number; /* BIOS drive number */ 124 __u8 reserved; /* Unused */ 125 __u8 ext_boot_sign; /* 0x29 if fields below exist (DOS 3.3+) */ 126 __u8 volume_id[4]; /* Volume ID number */ 127 char volume_label[11]; /* Volume label */ 128 char fs_type[8]; /* Typically FAT12, FAT16, or FAT32 */ 129 /* Boot code comes next, all but 2 bytes to fill up sector */ 130 /* Boot sign comes last, 2 bytes */ 131 } volume_info; 132 133 typedef struct dir_entry { 134 char name[8],ext[3]; /* Name and extension */ 135 __u8 attr; /* Attribute bits */ 136 __u8 lcase; /* Case for base and extension */ 137 __u8 ctime_ms; /* Creation time, milliseconds */ 138 __u16 ctime; /* Creation time */ 139 __u16 cdate; /* Creation date */ 140 __u16 adate; /* Last access date */ 141 __u16 starthi; /* High 16 bits of cluster in FAT32 */ 142 __u16 time,date,start;/* Time, date and first cluster */ 143 __u32 size; /* File size in bytes */ 144 } dir_entry; 145 146 typedef struct dir_slot { 147 __u8 id; /* Sequence number for slot */ 148 __u8 name0_4[10]; /* First 5 characters in name */ 149 __u8 attr; /* Attribute byte */ 150 __u8 reserved; /* Unused */ 151 __u8 alias_checksum;/* Checksum for 8.3 alias */ 152 __u8 name5_10[12]; /* 6 more characters in name */ 153 __u16 start; /* Unused */ 154 __u8 name11_12[4]; /* Last 2 characters in name */ 155 } dir_slot; 156 157 /* 158 * Private filesystem parameters 159 * 160 * Note: FAT buffer has to be 32 bit aligned 161 * (see FAT32 accesses) 162 */ 163 typedef struct { 164 __u8 *fatbuf; /* Current FAT buffer */ 165 int fatsize; /* Size of FAT in bits */ 166 __u32 fatlength; /* Length of FAT in sectors */ 167 __u16 fat_sect; /* Starting sector of the FAT */ 168 __u32 rootdir_sect; /* Start sector of root directory */ 169 __u16 sect_size; /* Size of sectors in bytes */ 170 __u16 clust_size; /* Size of clusters in sectors */ 171 int data_begin; /* The sector of the first cluster, can be negative */ 172 int fatbufnum; /* Used by get_fatent, init to -1 */ 173 } fsdata; 174 175 typedef int (file_detectfs_func)(void); 176 typedef int (file_ls_func)(const char *dir); 177 typedef long (file_read_func)(const char *filename, void *buffer, 178 unsigned long maxsize); 179 180 struct filesystem { 181 file_detectfs_func *detect; 182 file_ls_func *ls; 183 file_read_func *read; 184 const char name[12]; 185 }; 186 187 /* FAT tables */ 188 file_detectfs_func file_fat_detectfs; 189 file_ls_func file_fat_ls; 190 file_read_func file_fat_read; 191 192 /* Currently this doesn't check if the dir exists or is valid... */ 193 int file_cd(const char *path); 194 int file_fat_detectfs(void); 195 int file_fat_ls(const char *dir); 196 int fat_exists(const char *filename); 197 long file_fat_read_at(const char *filename, unsigned long pos, void *buffer, 198 unsigned long maxsize); 199 long file_fat_read(const char *filename, void *buffer, unsigned long maxsize); 200 const char *file_getfsname(int idx); 201 int fat_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info); 202 int fat_register_device(block_dev_desc_t *dev_desc, int part_no); 203 204 int file_fat_write(const char *filename, void *buffer, unsigned long maxsize); 205 int fat_read_file(const char *filename, void *buf, int offset, int len); 206 void fat_close(void); 207 #endif /* _FAT_H_ */ 208