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wdenk71f95112003-06-15 22:40:42 +00001/*
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
wdenk5cf91d62004-04-23 20:32:05 +000030#include <asm/byteorder.h>
31
wdenk71f95112003-06-15 22:40:42 +000032#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)
wdenkcd37d9e2004-02-10 00:03:41 +000048#define FAT12BUFSIZE ((FATBUFSIZE*2)/3)
wdenk71f95112003-06-15 22:40:42 +000049#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 to represent 'å' in name[0] */
71
wdenk2d1a5372004-02-23 19:30:57 +000072/* 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
wdenk71f95112003-06-15 22:40:42 +000076
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
wdenk9fd5e312003-12-07 23:55:12 +000098#if __LITTLE_ENDIAN
wdenk71f95112003-06-15 22:40:42 +000099#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
115
116typedef 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) */
131
132 /* FAT32 only */
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 */
140} boot_sector;
141
142typedef struct volume_info
143{
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 */
152} volume_info;
153
154typedef 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 */
165} dir_entry;
166
167typedef 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 */
176} dir_slot;
177
178/* Private filesystem parameters */
179typedef struct {
180 int fatsize; /* Size of FAT in bits */
181 __u16 fatlength; /* Length of FAT in sectors */
182 __u16 fat_sect; /* Starting sector of the FAT */
183 __u16 rootdir_sect; /* Start sector of root directory */
184 __u16 clust_size; /* Size of clusters in sectors */
wdenkcd37d9e2004-02-10 00:03:41 +0000185 short data_begin; /* The sector of the first cluster, can be negative */
wdenk71f95112003-06-15 22:40:42 +0000186 __u8 fatbuf[FATBUFSIZE]; /* Current FAT buffer */
187 int fatbufnum; /* Used by get_fatent, init to -1 */
188} fsdata;
189
190typedef int (file_detectfs_func)(void);
191typedef int (file_ls_func)(const char *dir);
192typedef long (file_read_func)(const char *filename, void *buffer,
193 unsigned long maxsize);
194
195struct filesystem {
196 file_detectfs_func *detect;
197 file_ls_func *ls;
198 file_read_func *read;
199 const char name[12];
200};
201
202/* FAT tables */
203file_detectfs_func file_fat_detectfs;
204file_ls_func file_fat_ls;
205file_read_func file_fat_read;
206
207/* Currently this doesn't check if the dir exists or is valid... */
208int file_cd(const char *path);
209int file_fat_detectfs(void);
210int file_fat_ls(const char *dir);
211long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);
212const char *file_getfsname(int idx);
wdenk7205e402003-09-10 22:30:53 +0000213int fat_register_device(block_dev_desc_t *dev_desc, int part_no);
wdenk71f95112003-06-15 22:40:42 +0000214
wdenk71f95112003-06-15 22:40:42 +0000215#endif /* _FAT_H_ */