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
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
38 #define MAX_CLUSTSIZE 65536
39 #define DIRENTSPERBLOCK (mydata->sect_size / sizeof(dir_entry))
40 #define DIRENTSPERCLUST ((mydata->clust_size * mydata->sect_size) / \
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)
50 /* Filesystem identifiers */
51 #define FAT12_SIGN "FAT12 "
52 #define FAT16_SIGN "FAT16 "
53 #define FAT32_SIGN "FAT32 "
64 #define ATTR_VFAT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
66 #define DELETED_FLAG ((char)0xe5) /* Marks deleted files when in name[0] */
67 #define aRING 0x05 /* Used as special character in name[0] */
70 * Indicates that the entry is the last long entry in a set of long
73 #define LAST_LONG_ENTRY_MASK 0x40
75 /* Flags telling whether we should read a file or list a directory */
81 #define ISDIRDELIM(c) ((c) == '/' || (c) == '\\')
83 #define FSTYPE_NONE (-1)
85 #if defined(__linux__) && defined(__KERNEL__)
86 #define FAT2CPU16 le16_to_cpu
87 #define FAT2CPU32 le32_to_cpu
90 #define FAT2CPU16(x) (x)
91 #define FAT2CPU32(x) (x)
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))
101 #define START(dent) (FAT2CPU16((dent)->start) \
102 + (mydata->fatsize != 32 ? 0 : \
103 (FAT2CPU16((dent)->starthi) << 16)))
104 #define CHECK_CLUST(x, fatsize) ((x) <= 1 || \
105 (x) >= ((fatsize) != 32 ? 0xfff0 : 0xffffff0))
107 typedef struct boot_sector {
108 __u8 ignored[3]; /* Bootstrap code */
109 char system_id[8]; /* Name of fs */
110 __u8 sector_size[2]; /* Bytes/sector */
111 __u8 cluster_size; /* Sectors/cluster */
112 __u16 reserved; /* Number of reserved sectors */
113 __u8 fats; /* Number of FATs */
114 __u8 dir_entries[2]; /* Number of root directory entries */
115 __u8 sectors[2]; /* Number of sectors */
116 __u8 media; /* Media code */
117 __u16 fat_length; /* Sectors/FAT */
118 __u16 secs_track; /* Sectors/track */
119 __u16 heads; /* Number of heads */
120 __u32 hidden; /* Number of hidden sectors */
121 __u32 total_sect; /* Number of sectors (if sectors == 0) */
124 __u32 fat32_length; /* Sectors/FAT */
125 __u16 flags; /* Bit 8: fat mirroring, low 4: active fat */
126 __u8 version[2]; /* Filesystem version */
127 __u32 root_cluster; /* First cluster in root directory */
128 __u16 info_sector; /* Filesystem info sector */
129 __u16 backup_boot; /* Backup boot sector */
130 __u16 reserved2[6]; /* Unused */
133 typedef struct volume_info
135 __u8 drive_number; /* BIOS drive number */
136 __u8 reserved; /* Unused */
137 __u8 ext_boot_sign; /* 0x29 if fields below exist (DOS 3.3+) */
138 __u8 volume_id[4]; /* Volume ID number */
139 char volume_label[11]; /* Volume label */
140 char fs_type[8]; /* Typically FAT12, FAT16, or FAT32 */
141 /* Boot code comes next, all but 2 bytes to fill up sector */
142 /* Boot sign comes last, 2 bytes */
145 typedef struct dir_entry {
146 char name[8],ext[3]; /* Name and extension */
147 __u8 attr; /* Attribute bits */
148 __u8 lcase; /* Case for base and extension */
149 __u8 ctime_ms; /* Creation time, milliseconds */
150 __u16 ctime; /* Creation time */
151 __u16 cdate; /* Creation date */
152 __u16 adate; /* Last access date */
153 __u16 starthi; /* High 16 bits of cluster in FAT32 */
154 __u16 time,date,start;/* Time, date and first cluster */
155 __u32 size; /* File size in bytes */
158 typedef struct dir_slot {
159 __u8 id; /* Sequence number for slot */
160 __u8 name0_4[10]; /* First 5 characters in name */
161 __u8 attr; /* Attribute byte */
162 __u8 reserved; /* Unused */
163 __u8 alias_checksum;/* Checksum for 8.3 alias */
164 __u8 name5_10[12]; /* 6 more characters in name */
165 __u16 start; /* Unused */
166 __u8 name11_12[4]; /* Last 2 characters in name */
170 * Private filesystem parameters
172 * Note: FAT buffer has to be 32 bit aligned
173 * (see FAT32 accesses)
176 __u8 *fatbuf; /* Current FAT buffer */
177 int fatsize; /* Size of FAT in bits */
178 __u32 fatlength; /* Length of FAT in sectors */
179 __u16 fat_sect; /* Starting sector of the FAT */
180 __u32 rootdir_sect; /* Start sector of root directory */
181 __u16 sect_size; /* Size of sectors in bytes */
182 __u16 clust_size; /* Size of clusters in sectors */
183 int data_begin; /* The sector of the first cluster, can be negative */
184 int fatbufnum; /* Used by get_fatent, init to -1 */
187 typedef int (file_detectfs_func)(void);
188 typedef int (file_ls_func)(const char *dir);
189 typedef long (file_read_func)(const char *filename, void *buffer,
190 unsigned long maxsize);
193 file_detectfs_func *detect;
195 file_read_func *read;
200 file_detectfs_func file_fat_detectfs;
201 file_ls_func file_fat_ls;
202 file_read_func file_fat_read;
204 /* Currently this doesn't check if the dir exists or is valid... */
205 int file_cd(const char *path);
206 int file_fat_detectfs(void);
207 int file_fat_ls(const char *dir);
208 long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
209 unsigned long maxsize);
210 long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);
211 const char *file_getfsname(int idx);
212 int fat_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);
213 int fat_register_device(block_dev_desc_t *dev_desc, int part_no);
215 int file_fat_write(const char *filename, void *buffer, unsigned long maxsize);