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 34 #define SECTOR_SIZE FS_BLOCK_SIZE 35 36 #define FS_BLOCK_SIZE 512 37 38 #if FS_BLOCK_SIZE != SECTOR_SIZE 39 #error FS_BLOCK_SIZE != SECTOR_SIZE - This code needs to be fixed! 40 #endif 41 42 #define MAX_CLUSTSIZE 65536 43 #define DIRENTSPERBLOCK (FS_BLOCK_SIZE/sizeof(dir_entry)) 44 #define DIRENTSPERCLUST ((mydata->clust_size*SECTOR_SIZE)/sizeof(dir_entry)) 45 46 #define FATBUFBLOCKS 6 47 #define FATBUFSIZE (FS_BLOCK_SIZE*FATBUFBLOCKS) 48 #define FAT12BUFSIZE ((FATBUFSIZE*2)/3) 49 #define FAT16BUFSIZE (FATBUFSIZE/2) 50 #define FAT32BUFSIZE (FATBUFSIZE/4) 51 52 53 /* Filesystem identifiers */ 54 #define FAT12_SIGN "FAT12 " 55 #define FAT16_SIGN "FAT16 " 56 #define FAT32_SIGN "FAT32 " 57 #define SIGNLEN 8 58 59 /* File attributes */ 60 #define ATTR_RO 1 61 #define ATTR_HIDDEN 2 62 #define ATTR_SYS 4 63 #define ATTR_VOLUME 8 64 #define ATTR_DIR 16 65 #define ATTR_ARCH 32 66 67 #define ATTR_VFAT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) 68 69 #define DELETED_FLAG ((char)0xe5) /* Marks deleted files when in name[0] */ 70 #define aRING 0x05 /* Used as special character in name[0] */ 71 72 /* Indicates that the entry is the last long entry in a set of long 73 * dir entries 74 */ 75 #define LAST_LONG_ENTRY_MASK 0x40 76 77 /* Flags telling whether we should read a file or list a directory */ 78 #define LS_NO 0 79 #define LS_YES 1 80 #define LS_DIR 1 81 #define LS_ROOT 2 82 83 #ifdef DEBUG 84 #define FAT_DPRINT(args...) printf(args) 85 #else 86 #define FAT_DPRINT(args...) 87 #endif 88 #define FAT_ERROR(arg) printf(arg) 89 90 #define ISDIRDELIM(c) ((c) == '/' || (c) == '\\') 91 92 #define FSTYPE_NONE (-1) 93 94 #if defined(__linux__) && defined(__KERNEL__) 95 #define FAT2CPU16 le16_to_cpu 96 #define FAT2CPU32 le32_to_cpu 97 #else 98 #if __LITTLE_ENDIAN 99 #define FAT2CPU16(x) (x) 100 #define FAT2CPU32(x) (x) 101 #else 102 #define FAT2CPU16(x) ((((x) & 0x00ff) << 8) | (((x) & 0xff00) >> 8)) 103 #define FAT2CPU32(x) ((((x) & 0x000000ff) << 24) | \ 104 (((x) & 0x0000ff00) << 8) | \ 105 (((x) & 0x00ff0000) >> 8) | \ 106 (((x) & 0xff000000) >> 24)) 107 #endif 108 #endif 109 110 #define TOLOWER(c) if((c) >= 'A' && (c) <= 'Z'){(c)+=('a' - 'A');} 111 #define START(dent) (FAT2CPU16((dent)->start) \ 112 + (mydata->fatsize != 32 ? 0 : \ 113 (FAT2CPU16((dent)->starthi) << 16))) 114 #define CHECK_CLUST(x, fatsize) ((x) <= 1 || \ 115 (x) >= ((fatsize) != 32 ? 0xfff0 : 0xffffff0)) 116 117 typedef struct boot_sector { 118 __u8 ignored[3]; /* Bootstrap code */ 119 char system_id[8]; /* Name of fs */ 120 __u8 sector_size[2]; /* Bytes/sector */ 121 __u8 cluster_size; /* Sectors/cluster */ 122 __u16 reserved; /* Number of reserved sectors */ 123 __u8 fats; /* Number of FATs */ 124 __u8 dir_entries[2]; /* Number of root directory entries */ 125 __u8 sectors[2]; /* Number of sectors */ 126 __u8 media; /* Media code */ 127 __u16 fat_length; /* Sectors/FAT */ 128 __u16 secs_track; /* Sectors/track */ 129 __u16 heads; /* Number of heads */ 130 __u32 hidden; /* Number of hidden sectors */ 131 __u32 total_sect; /* Number of sectors (if sectors == 0) */ 132 133 /* FAT32 only */ 134 __u32 fat32_length; /* Sectors/FAT */ 135 __u16 flags; /* Bit 8: fat mirroring, low 4: active fat */ 136 __u8 version[2]; /* Filesystem version */ 137 __u32 root_cluster; /* First cluster in root directory */ 138 __u16 info_sector; /* Filesystem info sector */ 139 __u16 backup_boot; /* Backup boot sector */ 140 __u16 reserved2[6]; /* Unused */ 141 } boot_sector; 142 143 typedef struct volume_info 144 { 145 __u8 drive_number; /* BIOS drive number */ 146 __u8 reserved; /* Unused */ 147 __u8 ext_boot_sign; /* 0x29 if fields below exist (DOS 3.3+) */ 148 __u8 volume_id[4]; /* Volume ID number */ 149 char volume_label[11]; /* Volume label */ 150 char fs_type[8]; /* Typically FAT12, FAT16, or FAT32 */ 151 /* Boot code comes next, all but 2 bytes to fill up sector */ 152 /* Boot sign comes last, 2 bytes */ 153 } volume_info; 154 155 typedef struct dir_entry { 156 char name[8],ext[3]; /* Name and extension */ 157 __u8 attr; /* Attribute bits */ 158 __u8 lcase; /* Case for base and extension */ 159 __u8 ctime_ms; /* Creation time, milliseconds */ 160 __u16 ctime; /* Creation time */ 161 __u16 cdate; /* Creation date */ 162 __u16 adate; /* Last access date */ 163 __u16 starthi; /* High 16 bits of cluster in FAT32 */ 164 __u16 time,date,start;/* Time, date and first cluster */ 165 __u32 size; /* File size in bytes */ 166 } dir_entry; 167 168 typedef struct dir_slot { 169 __u8 id; /* Sequence number for slot */ 170 __u8 name0_4[10]; /* First 5 characters in name */ 171 __u8 attr; /* Attribute byte */ 172 __u8 reserved; /* Unused */ 173 __u8 alias_checksum;/* Checksum for 8.3 alias */ 174 __u8 name5_10[12]; /* 6 more characters in name */ 175 __u16 start; /* Unused */ 176 __u8 name11_12[4]; /* Last 2 characters in name */ 177 } dir_slot; 178 179 /* Private filesystem parameters 180 * 181 * Note: FAT buffer has to be 32 bit aligned 182 * (see FAT32 accesses) 183 */ 184 typedef struct { 185 __u8 fatbuf[FATBUFSIZE]; /* Current FAT buffer */ 186 int fatsize; /* Size of FAT in bits */ 187 __u16 fatlength; /* Length of FAT in sectors */ 188 __u16 fat_sect; /* Starting sector of the FAT */ 189 __u16 rootdir_sect; /* Start sector of root directory */ 190 __u16 clust_size; /* Size of clusters in sectors */ 191 short data_begin; /* The sector of the first cluster, can be negative */ 192 int fatbufnum; /* Used by get_fatent, init to -1 */ 193 } fsdata; 194 195 typedef int (file_detectfs_func)(void); 196 typedef int (file_ls_func)(const char *dir); 197 typedef long (file_read_func)(const char *filename, void *buffer, 198 unsigned long maxsize); 199 200 struct filesystem { 201 file_detectfs_func *detect; 202 file_ls_func *ls; 203 file_read_func *read; 204 const char name[12]; 205 }; 206 207 /* FAT tables */ 208 file_detectfs_func file_fat_detectfs; 209 file_ls_func file_fat_ls; 210 file_read_func file_fat_read; 211 212 /* Currently this doesn't check if the dir exists or is valid... */ 213 int file_cd(const char *path); 214 int file_fat_detectfs(void); 215 int file_fat_ls(const char *dir); 216 long file_fat_read(const char *filename, void *buffer, unsigned long maxsize); 217 const char *file_getfsname(int idx); 218 int fat_register_device(block_dev_desc_t *dev_desc, int part_no); 219 220 #endif /* _FAT_H_ */ 221