2 * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
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
7 * See file CREDITS for list of people who contributed to this
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.
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.
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,
30 #include <asm/byteorder.h>
32 #define CONFIG_SUPPORT_VFAT
34 #define SECTOR_SIZE FS_BLOCK_SIZE
36 #define FS_BLOCK_SIZE 512
38 #if FS_BLOCK_SIZE != SECTOR_SIZE
39 #error FS_BLOCK_SIZE != SECTOR_SIZE - This code needs to be fixed!
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))
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)
53 /* Filesystem identifiers */
54 #define FAT12_SIGN "FAT12 "
55 #define FAT16_SIGN "FAT16 "
56 #define FAT32_SIGN "FAT32 "
67 #define ATTR_VFAT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
69 #define DELETED_FLAG ((char)0xe5) /* Marks deleted files when in name[0] */
70 #define aRING 0x05 /* Used to represent 'å' in name[0] */
72 /* Indicates that the entry is the last long entry in a set of long
75 #define LAST_LONG_ENTRY_MASK 0x40
77 /* Flags telling whether we should read a file or list a directory */
84 #define FAT_DPRINT(args...) printf(args)
86 #define FAT_DPRINT(args...)
88 #define FAT_ERROR(arg) printf(arg)
90 #define ISDIRDELIM(c) ((c) == '/' || (c) == '\\')
92 #define FSTYPE_NONE (-1)
94 #if defined(__linux__) && defined(__KERNEL__)
95 #define FAT2CPU16 le16_to_cpu
96 #define FAT2CPU32 le32_to_cpu
99 #define FAT2CPU16(x) (x)
100 #define FAT2CPU32(x) (x)
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))
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)))
116 typedef struct boot_sector
{
117 __u8 ignored
[3]; /* Bootstrap code */
118 char system_id
[8]; /* Name of fs */
119 __u8 sector_size
[2]; /* Bytes/sector */
120 __u8 cluster_size
; /* Sectors/cluster */
121 __u16 reserved
; /* Number of reserved sectors */
122 __u8 fats
; /* Number of FATs */
123 __u8 dir_entries
[2]; /* Number of root directory entries */
124 __u8 sectors
[2]; /* Number of sectors */
125 __u8 media
; /* Media code */
126 __u16 fat_length
; /* Sectors/FAT */
127 __u16 secs_track
; /* Sectors/track */
128 __u16 heads
; /* Number of heads */
129 __u32 hidden
; /* Number of hidden sectors */
130 __u32 total_sect
; /* Number of sectors (if sectors == 0) */
133 __u32 fat32_length
; /* Sectors/FAT */
134 __u16 flags
; /* Bit 8: fat mirroring, low 4: active fat */
135 __u8 version
[2]; /* Filesystem version */
136 __u32 root_cluster
; /* First cluster in root directory */
137 __u16 info_sector
; /* Filesystem info sector */
138 __u16 backup_boot
; /* Backup boot sector */
139 __u16 reserved2
[6]; /* Unused */
142 typedef struct volume_info
144 __u8 drive_number
; /* BIOS drive number */
145 __u8 reserved
; /* Unused */
146 __u8 ext_boot_sign
; /* 0x29 if fields below exist (DOS 3.3+) */
147 __u8 volume_id
[4]; /* Volume ID number */
148 char volume_label
[11]; /* Volume label */
149 char fs_type
[8]; /* Typically FAT12, FAT16, or FAT32 */
150 /* Boot code comes next, all but 2 bytes to fill up sector */
151 /* Boot sign comes last, 2 bytes */
154 typedef struct dir_entry
{
155 char name
[8],ext
[3]; /* Name and extension */
156 __u8 attr
; /* Attribute bits */
157 __u8 lcase
; /* Case for base and extension */
158 __u8 ctime_ms
; /* Creation time, milliseconds */
159 __u16 ctime
; /* Creation time */
160 __u16 cdate
; /* Creation date */
161 __u16 adate
; /* Last access date */
162 __u16 starthi
; /* High 16 bits of cluster in FAT32 */
163 __u16 time
,date
,start
;/* Time, date and first cluster */
164 __u32 size
; /* File size in bytes */
167 typedef struct dir_slot
{
168 __u8 id
; /* Sequence number for slot */
169 __u8 name0_4
[10]; /* First 5 characters in name */
170 __u8 attr
; /* Attribute byte */
171 __u8 reserved
; /* Unused */
172 __u8 alias_checksum
;/* Checksum for 8.3 alias */
173 __u8 name5_10
[12]; /* 6 more characters in name */
174 __u16 start
; /* Unused */
175 __u8 name11_12
[4]; /* Last 2 characters in name */
178 /* Private filesystem parameters
180 * Note: FAT buffer has to be 32 bit aligned
181 * (see FAT32 accesses)
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 */
194 typedef int (file_detectfs_func
)(void);
195 typedef int (file_ls_func
)(const char *dir
);
196 typedef long (file_read_func
)(const char *filename
, void *buffer
,
197 unsigned long maxsize
);
200 file_detectfs_func
*detect
;
202 file_read_func
*read
;
207 file_detectfs_func file_fat_detectfs
;
208 file_ls_func file_fat_ls
;
209 file_read_func file_fat_read
;
211 /* Currently this doesn't check if the dir exists or is valid... */
212 int file_cd(const char *path
);
213 int file_fat_detectfs(void);
214 int file_fat_ls(const char *dir
);
215 long file_fat_read(const char *filename
, void *buffer
, unsigned long maxsize
);
216 const char *file_getfsname(int idx
);
217 int fat_register_device(block_dev_desc_t
*dev_desc
, int part_no
);