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