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 * See file CREDITS for list of people who contributed to this 8 * project. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License as 12 * published by the Free Software Foundation; either version 2 of 13 * the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 23 * MA 02111-1307 USA 24 * 25 */ 26 27 #ifndef _FAT_H_ 28 #define _FAT_H_ 29 30 #define CONFIG_SUPPORT_VFAT 31 32 #define SECTOR_SIZE FS_BLOCK_SIZE 33 34 #define FS_BLOCK_SIZE 512 35 36 #if FS_BLOCK_SIZE != SECTOR_SIZE 37 #error FS_BLOCK_SIZE != SECTOR_SIZE - This code needs to be fixed! 38 #endif 39 40 #define MAX_CLUSTSIZE 65536 41 #define DIRENTSPERBLOCK (FS_BLOCK_SIZE/sizeof(dir_entry)) 42 #define DIRENTSPERCLUST ((mydata->clust_size*SECTOR_SIZE)/sizeof(dir_entry)) 43 44 #define FATBUFBLOCKS 6 45 #define FATBUFSIZE (FS_BLOCK_SIZE*FATBUFBLOCKS) 46 #define FAT12BUFSIZE ((FATBUFSIZE*3)/2) 47 #define FAT16BUFSIZE (FATBUFSIZE/2) 48 #define FAT32BUFSIZE (FATBUFSIZE/4) 49 50 51 /* Filesystem identifiers */ 52 #define FAT12_SIGN "FAT12 " 53 #define FAT16_SIGN "FAT16 " 54 #define FAT32_SIGN "FAT32 " 55 #define SIGNLEN 8 56 57 /* File attributes */ 58 #define ATTR_RO 1 59 #define ATTR_HIDDEN 2 60 #define ATTR_SYS 4 61 #define ATTR_VOLUME 8 62 #define ATTR_DIR 16 63 #define ATTR_ARCH 32 64 65 #define ATTR_VFAT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) 66 67 #define DELETED_FLAG ((char)0xe5) /* Marks deleted files when in name[0] */ 68 #define aRING 0x05 /* Used to represent '�' in name[0] */ 69 70 71 /* Flags telling whether we should read a file or list a directory */ 72 #define LS_NO 0 73 #define LS_YES 1 74 #define LS_DIR 1 75 #define LS_ROOT 2 76 77 #ifdef DEBUG 78 #define FAT_DPRINT(args...) printf(args) 79 #else 80 #define FAT_DPRINT(args...) 81 #endif 82 #define FAT_ERROR(arg) printf(arg) 83 84 #define ISDIRDELIM(c) ((c) == '/' || (c) == '\\') 85 86 #define FSTYPE_NONE (-1) 87 88 #if defined(__linux__) && defined(__KERNEL__) 89 #define FAT2CPU16 le16_to_cpu 90 #define FAT2CPU32 le32_to_cpu 91 #else 92 #if __LITTLE_ENDIAN 93 #define FAT2CPU16(x) (x) 94 #define FAT2CPU32(x) (x) 95 #else 96 #define FAT2CPU16(x) ((((x) & 0x00ff) << 8) | (((x) & 0xff00) >> 8)) 97 #define FAT2CPU32(x) ((((x) & 0x000000ff) << 24) | \ 98 (((x) & 0x0000ff00) << 8) | \ 99 (((x) & 0x00ff0000) >> 8) | \ 100 (((x) & 0xff000000) >> 24)) 101 #endif 102 #endif 103 104 #define TOLOWER(c) if((c) >= 'A' && (c) <= 'Z'){(c)+=('a' - 'A');} 105 #define START(dent) (FAT2CPU16((dent)->start) \ 106 + (mydata->fatsize != 32 ? 0 : \ 107 (FAT2CPU16((dent)->starthi) << 16))) 108 109 110 typedef struct boot_sector { 111 __u8 ignored[3]; /* Bootstrap code */ 112 char system_id[8]; /* Name of fs */ 113 __u8 sector_size[2]; /* Bytes/sector */ 114 __u8 cluster_size; /* Sectors/cluster */ 115 __u16 reserved; /* Number of reserved sectors */ 116 __u8 fats; /* Number of FATs */ 117 __u8 dir_entries[2]; /* Number of root directory entries */ 118 __u8 sectors[2]; /* Number of sectors */ 119 __u8 media; /* Media code */ 120 __u16 fat_length; /* Sectors/FAT */ 121 __u16 secs_track; /* Sectors/track */ 122 __u16 heads; /* Number of heads */ 123 __u32 hidden; /* Number of hidden sectors */ 124 __u32 total_sect; /* Number of sectors (if sectors == 0) */ 125 126 /* FAT32 only */ 127 __u32 fat32_length; /* Sectors/FAT */ 128 __u16 flags; /* Bit 8: fat mirroring, low 4: active fat */ 129 __u8 version[2]; /* Filesystem version */ 130 __u32 root_cluster; /* First cluster in root directory */ 131 __u16 info_sector; /* Filesystem info sector */ 132 __u16 backup_boot; /* Backup boot sector */ 133 __u16 reserved2[6]; /* Unused */ 134 } boot_sector; 135 136 typedef struct volume_info 137 { 138 __u8 drive_number; /* BIOS drive number */ 139 __u8 reserved; /* Unused */ 140 __u8 ext_boot_sign; /* 0x29 if fields below exist (DOS 3.3+) */ 141 __u8 volume_id[4]; /* Volume ID number */ 142 char volume_label[11]; /* Volume label */ 143 char fs_type[8]; /* Typically FAT12, FAT16, or FAT32 */ 144 /* Boot code comes next, all but 2 bytes to fill up sector */ 145 /* Boot sign comes last, 2 bytes */ 146 } volume_info; 147 148 typedef struct dir_entry { 149 char name[8],ext[3]; /* Name and extension */ 150 __u8 attr; /* Attribute bits */ 151 __u8 lcase; /* Case for base and extension */ 152 __u8 ctime_ms; /* Creation time, milliseconds */ 153 __u16 ctime; /* Creation time */ 154 __u16 cdate; /* Creation date */ 155 __u16 adate; /* Last access date */ 156 __u16 starthi; /* High 16 bits of cluster in FAT32 */ 157 __u16 time,date,start;/* Time, date and first cluster */ 158 __u32 size; /* File size in bytes */ 159 } dir_entry; 160 161 typedef struct dir_slot { 162 __u8 id; /* Sequence number for slot */ 163 __u8 name0_4[10]; /* First 5 characters in name */ 164 __u8 attr; /* Attribute byte */ 165 __u8 reserved; /* Unused */ 166 __u8 alias_checksum;/* Checksum for 8.3 alias */ 167 __u8 name5_10[12]; /* 6 more characters in name */ 168 __u16 start; /* Unused */ 169 __u8 name11_12[4]; /* Last 2 characters in name */ 170 } dir_slot; 171 172 /* Private filesystem parameters */ 173 typedef struct { 174 int fatsize; /* Size of FAT in bits */ 175 __u16 fatlength; /* Length of FAT in sectors */ 176 __u16 fat_sect; /* Starting sector of the FAT */ 177 __u16 rootdir_sect; /* Start sector of root directory */ 178 __u16 clust_size; /* Size of clusters in sectors */ 179 __u16 data_begin; /* The sector of the first cluster */ 180 __u8 fatbuf[FATBUFSIZE]; /* Current FAT buffer */ 181 int fatbufnum; /* Used by get_fatent, init to -1 */ 182 } fsdata; 183 184 typedef int (file_detectfs_func)(void); 185 typedef int (file_ls_func)(const char *dir); 186 typedef long (file_read_func)(const char *filename, void *buffer, 187 unsigned long maxsize); 188 189 struct filesystem { 190 file_detectfs_func *detect; 191 file_ls_func *ls; 192 file_read_func *read; 193 const char name[12]; 194 }; 195 196 /* FAT tables */ 197 file_detectfs_func file_fat_detectfs; 198 file_ls_func file_fat_ls; 199 file_read_func file_fat_read; 200 201 /* Currently this doesn't check if the dir exists or is valid... */ 202 int file_cd(const char *path); 203 int file_fat_detectfs(void); 204 int file_fat_ls(const char *dir); 205 long file_fat_read(const char *filename, void *buffer, unsigned long maxsize); 206 const char *file_getfsname(int idx); 207 int fat_register_device(block_dev_desc_t *dev_desc, int part_no); 208 209 #endif /* _FAT_H_ */ 210