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 #include <asm/byteorder.h> 31 32 #define CONFIG_SUPPORT_VFAT 33 /* Maximum Long File Name length supported here is 128 UTF-16 code units */ 34 #define VFAT_MAXLEN_BYTES 256 /* Maximum LFN buffer in bytes */ 35 #define VFAT_MAXSEQ 9 /* Up to 9 of 13 2-byte UTF-16 entries */ 36 #define PREFETCH_BLOCKS 2 37 38 #define MAX_CLUSTSIZE 65536 39 #define DIRENTSPERBLOCK (mydata->sect_size / sizeof(dir_entry)) 40 #define DIRENTSPERCLUST ((mydata->clust_size * mydata->sect_size) / \ 41 sizeof(dir_entry)) 42 43 #define FATBUFBLOCKS 6 44 #define FATBUFSIZE (mydata->sect_size * FATBUFBLOCKS) 45 #define FAT12BUFSIZE ((FATBUFSIZE*2)/3) 46 #define FAT16BUFSIZE (FATBUFSIZE/2) 47 #define FAT32BUFSIZE (FATBUFSIZE/4) 48 49 50 /* Filesystem identifiers */ 51 #define FAT12_SIGN "FAT12 " 52 #define FAT16_SIGN "FAT16 " 53 #define FAT32_SIGN "FAT32 " 54 #define SIGNLEN 8 55 56 /* File attributes */ 57 #define ATTR_RO 1 58 #define ATTR_HIDDEN 2 59 #define ATTR_SYS 4 60 #define ATTR_VOLUME 8 61 #define ATTR_DIR 16 62 #define ATTR_ARCH 32 63 64 #define ATTR_VFAT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) 65 66 #define DELETED_FLAG ((char)0xe5) /* Marks deleted files when in name[0] */ 67 #define aRING 0x05 /* Used as special character in name[0] */ 68 69 /* 70 * Indicates that the entry is the last long entry in a set of long 71 * dir entries 72 */ 73 #define LAST_LONG_ENTRY_MASK 0x40 74 75 /* Flags telling whether we should read a file or list a directory */ 76 #define LS_NO 0 77 #define LS_YES 1 78 #define LS_DIR 1 79 #define LS_ROOT 2 80 81 #define ISDIRDELIM(c) ((c) == '/' || (c) == '\\') 82 83 #define FSTYPE_NONE (-1) 84 85 #if defined(__linux__) && defined(__KERNEL__) 86 #define FAT2CPU16 le16_to_cpu 87 #define FAT2CPU32 le32_to_cpu 88 #else 89 #if __LITTLE_ENDIAN 90 #define FAT2CPU16(x) (x) 91 #define FAT2CPU32(x) (x) 92 #else 93 #define FAT2CPU16(x) ((((x) & 0x00ff) << 8) | (((x) & 0xff00) >> 8)) 94 #define FAT2CPU32(x) ((((x) & 0x000000ff) << 24) | \ 95 (((x) & 0x0000ff00) << 8) | \ 96 (((x) & 0x00ff0000) >> 8) | \ 97 (((x) & 0xff000000) >> 24)) 98 #endif 99 #endif 100 101 #define TOLOWER(c) if((c) >= 'A' && (c) <= 'Z'){(c)+=('a' - 'A');} 102 #define START(dent) (FAT2CPU16((dent)->start) \ 103 + (mydata->fatsize != 32 ? 0 : \ 104 (FAT2CPU16((dent)->starthi) << 16))) 105 #define CHECK_CLUST(x, fatsize) ((x) <= 1 || \ 106 (x) >= ((fatsize) != 32 ? 0xfff0 : 0xffffff0)) 107 108 typedef struct boot_sector { 109 __u8 ignored[3]; /* Bootstrap code */ 110 char system_id[8]; /* Name of fs */ 111 __u8 sector_size[2]; /* Bytes/sector */ 112 __u8 cluster_size; /* Sectors/cluster */ 113 __u16 reserved; /* Number of reserved sectors */ 114 __u8 fats; /* Number of FATs */ 115 __u8 dir_entries[2]; /* Number of root directory entries */ 116 __u8 sectors[2]; /* Number of sectors */ 117 __u8 media; /* Media code */ 118 __u16 fat_length; /* Sectors/FAT */ 119 __u16 secs_track; /* Sectors/track */ 120 __u16 heads; /* Number of heads */ 121 __u32 hidden; /* Number of hidden sectors */ 122 __u32 total_sect; /* Number of sectors (if sectors == 0) */ 123 124 /* FAT32 only */ 125 __u32 fat32_length; /* Sectors/FAT */ 126 __u16 flags; /* Bit 8: fat mirroring, low 4: active fat */ 127 __u8 version[2]; /* Filesystem version */ 128 __u32 root_cluster; /* First cluster in root directory */ 129 __u16 info_sector; /* Filesystem info sector */ 130 __u16 backup_boot; /* Backup boot sector */ 131 __u16 reserved2[6]; /* Unused */ 132 } boot_sector; 133 134 typedef struct volume_info 135 { 136 __u8 drive_number; /* BIOS drive number */ 137 __u8 reserved; /* Unused */ 138 __u8 ext_boot_sign; /* 0x29 if fields below exist (DOS 3.3+) */ 139 __u8 volume_id[4]; /* Volume ID number */ 140 char volume_label[11]; /* Volume label */ 141 char fs_type[8]; /* Typically FAT12, FAT16, or FAT32 */ 142 /* Boot code comes next, all but 2 bytes to fill up sector */ 143 /* Boot sign comes last, 2 bytes */ 144 } volume_info; 145 146 typedef struct dir_entry { 147 char name[8],ext[3]; /* Name and extension */ 148 __u8 attr; /* Attribute bits */ 149 __u8 lcase; /* Case for base and extension */ 150 __u8 ctime_ms; /* Creation time, milliseconds */ 151 __u16 ctime; /* Creation time */ 152 __u16 cdate; /* Creation date */ 153 __u16 adate; /* Last access date */ 154 __u16 starthi; /* High 16 bits of cluster in FAT32 */ 155 __u16 time,date,start;/* Time, date and first cluster */ 156 __u32 size; /* File size in bytes */ 157 } dir_entry; 158 159 typedef struct dir_slot { 160 __u8 id; /* Sequence number for slot */ 161 __u8 name0_4[10]; /* First 5 characters in name */ 162 __u8 attr; /* Attribute byte */ 163 __u8 reserved; /* Unused */ 164 __u8 alias_checksum;/* Checksum for 8.3 alias */ 165 __u8 name5_10[12]; /* 6 more characters in name */ 166 __u16 start; /* Unused */ 167 __u8 name11_12[4]; /* Last 2 characters in name */ 168 } dir_slot; 169 170 /* 171 * Private filesystem parameters 172 * 173 * Note: FAT buffer has to be 32 bit aligned 174 * (see FAT32 accesses) 175 */ 176 typedef struct { 177 __u8 *fatbuf; /* Current FAT buffer */ 178 int fatsize; /* Size of FAT in bits */ 179 __u16 fatlength; /* Length of FAT in sectors */ 180 __u16 fat_sect; /* Starting sector of the FAT */ 181 __u16 rootdir_sect; /* Start sector of root directory */ 182 __u16 sect_size; /* Size of sectors in bytes */ 183 __u16 clust_size; /* Size of clusters in sectors */ 184 short data_begin; /* The sector of the first cluster, can be negative */ 185 int fatbufnum; /* Used by get_fatent, init to -1 */ 186 } fsdata; 187 188 typedef int (file_detectfs_func)(void); 189 typedef int (file_ls_func)(const char *dir); 190 typedef long (file_read_func)(const char *filename, void *buffer, 191 unsigned long maxsize); 192 193 struct filesystem { 194 file_detectfs_func *detect; 195 file_ls_func *ls; 196 file_read_func *read; 197 const char name[12]; 198 }; 199 200 /* FAT tables */ 201 file_detectfs_func file_fat_detectfs; 202 file_ls_func file_fat_ls; 203 file_read_func file_fat_read; 204 205 /* Currently this doesn't check if the dir exists or is valid... */ 206 int file_cd(const char *path); 207 int file_fat_detectfs(void); 208 int file_fat_ls(const char *dir); 209 long file_fat_read(const char *filename, void *buffer, unsigned long maxsize); 210 const char *file_getfsname(int idx); 211 int fat_register_device(block_dev_desc_t *dev_desc, int part_no); 212 213 #endif /* _FAT_H_ */ 214