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 #define CONFIG_SUPPORT_VFAT
32 #define SECTOR_SIZE FS_BLOCK_SIZE
34 #define FS_BLOCK_SIZE 512
36 #if FS_BLOCK_SIZE != SECTOR_SIZE
37 #error FS_BLOCK_SIZE != SECTOR_SIZE - This code needs to be fixed!
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))
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)
51 /* Filesystem identifiers */
52 #define FAT12_SIGN "FAT12 "
53 #define FAT16_SIGN "FAT16 "
54 #define FAT32_SIGN "FAT32 "
65 #define ATTR_VFAT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
67 #define DELETED_FLAG ((char)0xe5) /* Marks deleted files when in name[0] */
68 #define aRING 0x05 /* Used to represent 'å' in name[0] */
71 /* Flags telling whether we should read a file or list a directory */
78 #define FAT_DPRINT(args...) printf(args)
80 #define FAT_DPRINT(args...)
82 #define FAT_ERROR(arg) printf(arg)
84 #define ISDIRDELIM(c) ((c) == '/' || (c) == '\\')
86 #define FSTYPE_NONE (-1)
88 #if defined(__linux__) && defined(__KERNEL__)
89 #define FAT2CPU16 le16_to_cpu
90 #define FAT2CPU32 le32_to_cpu
93 #define FAT2CPU16(x) (x)
94 #define FAT2CPU32(x) (x)
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))
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)))
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) */
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 */
136 typedef struct volume_info
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 */
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 */
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 */
172 /* Private filesystem parameters */
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 */
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
);
190 file_detectfs_func
*detect
;
192 file_read_func
*read
;
197 file_detectfs_func file_fat_detectfs
;
198 file_ls_func file_fat_ls
;
199 file_read_func file_fat_read
;
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
);