[u-boot.git] / include / fat.h

/*
 * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
 *
 * 2002-07-28 - [email protected] - ported to ppcboot v1.1.6
 * 2003-03-10 - [email protected] - ported to u-boot
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */

#ifndef _FAT_H_
#define _FAT_H_

#include <asm/byteorder.h>

#define CONFIG_SUPPORT_VFAT
/* Maximum Long File Name length supported here is 128 UTF-16 code units */
#define VFAT_MAXLEN_BYTES	256 /* Maximum LFN buffer in bytes */
#define VFAT_MAXSEQ		9   /* Up to 9 of 13 2-byte UTF-16 entries */
#define PREFETCH_BLOCKS		2

#define MAX_CLUSTSIZE	65536
#define DIRENTSPERBLOCK	(mydata->sect_size / sizeof(dir_entry))
#define DIRENTSPERCLUST	((mydata->clust_size * mydata->sect_size) / \
			 sizeof(dir_entry))

#define FATBUFBLOCKS	6
#define FATBUFSIZE	(mydata->sect_size * FATBUFBLOCKS)
#define FAT12BUFSIZE	((FATBUFSIZE*2)/3)
#define FAT16BUFSIZE	(FATBUFSIZE/2)
#define FAT32BUFSIZE	(FATBUFSIZE/4)


/* Filesystem identifiers */
#define FAT12_SIGN	"FAT12   "
#define FAT16_SIGN	"FAT16   "
#define FAT32_SIGN	"FAT32   "
#define SIGNLEN		8

/* File attributes */
#define ATTR_RO	1
#define ATTR_HIDDEN	2
#define ATTR_SYS	4
#define ATTR_VOLUME	8
#define ATTR_DIR	16
#define ATTR_ARCH	32

#define ATTR_VFAT	(ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)

#define DELETED_FLAG	((char)0xe5) /* Marks deleted files when in name[0] */
#define aRING		0x05	     /* Used as special character in name[0] */

/*
 * Indicates that the entry is the last long entry in a set of long
 * dir entries
 */
#define LAST_LONG_ENTRY_MASK	0x40

/* Flags telling whether we should read a file or list a directory */
#define LS_NO		0
#define LS_YES		1
#define LS_DIR		1
#define LS_ROOT		2

#define ISDIRDELIM(c)	((c) == '/' || (c) == '\\')

#define FSTYPE_NONE	(-1)

#if defined(__linux__) && defined(__KERNEL__)
#define FAT2CPU16	le16_to_cpu
#define FAT2CPU32	le32_to_cpu
#else
#if __LITTLE_ENDIAN
#define FAT2CPU16(x)	(x)
#define FAT2CPU32(x)	(x)
#else
#define FAT2CPU16(x)	((((x) & 0x00ff) << 8) | (((x) & 0xff00) >> 8))
#define FAT2CPU32(x)	((((x) & 0x000000ff) << 24)  |	\
			 (((x) & 0x0000ff00) << 8)  |	\
			 (((x) & 0x00ff0000) >> 8)  |	\
			 (((x) & 0xff000000) >> 24))
#endif
#endif

#define TOLOWER(c)	if((c) >= 'A' && (c) <= 'Z'){(c)+=('a' - 'A');}
#define TOUPPER(c)	if ((c) >= 'a' && (c) <= 'z') \
				(c) -= ('a' - 'A');
#define START(dent)	(FAT2CPU16((dent)->start) \
			+ (mydata->fatsize != 32 ? 0 : \
			  (FAT2CPU16((dent)->starthi) << 16)))
#define CHECK_CLUST(x, fatsize) ((x) <= 1 || \
				(x) >= ((fatsize) != 32 ? 0xfff0 : 0xffffff0))

typedef struct boot_sector {
	__u8	ignored[3];	/* Bootstrap code */
	char	system_id[8];	/* Name of fs */
	__u8	sector_size[2];	/* Bytes/sector */
	__u8	cluster_size;	/* Sectors/cluster */
	__u16	reserved;	/* Number of reserved sectors */
	__u8	fats;		/* Number of FATs */
	__u8	dir_entries[2];	/* Number of root directory entries */
	__u8	sectors[2];	/* Number of sectors */
	__u8	media;		/* Media code */
	__u16	fat_length;	/* Sectors/FAT */
	__u16	secs_track;	/* Sectors/track */
	__u16	heads;		/* Number of heads */
	__u32	hidden;		/* Number of hidden sectors */
	__u32	total_sect;	/* Number of sectors (if sectors == 0) */

	/* FAT32 only */
	__u32	fat32_length;	/* Sectors/FAT */
	__u16	flags;		/* Bit 8: fat mirroring, low 4: active fat */
	__u8	version[2];	/* Filesystem version */
	__u32	root_cluster;	/* First cluster in root directory */
	__u16	info_sector;	/* Filesystem info sector */
	__u16	backup_boot;	/* Backup boot sector */
	__u16	reserved2[6];	/* Unused */
} boot_sector;

typedef struct volume_info
{
	__u8 drive_number;	/* BIOS drive number */
	__u8 reserved;		/* Unused */
	__u8 ext_boot_sign;	/* 0x29 if fields below exist (DOS 3.3+) */
	__u8 volume_id[4];	/* Volume ID number */
	char volume_label[11];	/* Volume label */
	char fs_type[8];	/* Typically FAT12, FAT16, or FAT32 */
	/* Boot code comes next, all but 2 bytes to fill up sector */
	/* Boot sign comes last, 2 bytes */
} volume_info;

typedef struct dir_entry {
	char	name[8],ext[3];	/* Name and extension */
	__u8	attr;		/* Attribute bits */
	__u8	lcase;		/* Case for base and extension */
	__u8	ctime_ms;	/* Creation time, milliseconds */
	__u16	ctime;		/* Creation time */
	__u16	cdate;		/* Creation date */
	__u16	adate;		/* Last access date */
	__u16	starthi;	/* High 16 bits of cluster in FAT32 */
	__u16	time,date,start;/* Time, date and first cluster */
	__u32	size;		/* File size in bytes */
} dir_entry;

typedef struct dir_slot {
	__u8	id;		/* Sequence number for slot */
	__u8	name0_4[10];	/* First 5 characters in name */
	__u8	attr;		/* Attribute byte */
	__u8	reserved;	/* Unused */
	__u8	alias_checksum;/* Checksum for 8.3 alias */
	__u8	name5_10[12];	/* 6 more characters in name */
	__u16	start;		/* Unused */
	__u8	name11_12[4];	/* Last 2 characters in name */
} dir_slot;

/*
 * Private filesystem parameters
 *
 * Note: FAT buffer has to be 32 bit aligned
 * (see FAT32 accesses)
 */
typedef struct {
	__u8	*fatbuf;	/* Current FAT buffer */
	int	fatsize;	/* Size of FAT in bits */
	__u32	fatlength;	/* Length of FAT in sectors */
	__u16	fat_sect;	/* Starting sector of the FAT */
	__u32	rootdir_sect;	/* Start sector of root directory */
	__u16	sect_size;	/* Size of sectors in bytes */
	__u16	clust_size;	/* Size of clusters in sectors */
	int	data_begin;	/* The sector of the first cluster, can be negative */
	int	fatbufnum;	/* Used by get_fatent, init to -1 */
} fsdata;

typedef int	(file_detectfs_func)(void);
typedef int	(file_ls_func)(const char *dir);
typedef long	(file_read_func)(const char *filename, void *buffer,
				 unsigned long maxsize);

struct filesystem {
	file_detectfs_func	*detect;
	file_ls_func		*ls;
	file_read_func		*read;
	const char		name[12];
};

/* FAT tables */
file_detectfs_func	file_fat_detectfs;
file_ls_func		file_fat_ls;
file_read_func		file_fat_read;

/* Currently this doesn't check if the dir exists or is valid... */
int file_cd(const char *path);
int file_fat_detectfs(void);
int file_fat_ls(const char *dir);
long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
		      unsigned long maxsize);
long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);
const char *file_getfsname(int idx);
int fat_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);
int fat_register_device(block_dev_desc_t *dev_desc, int part_no);

int file_fat_write(const char *filename, void *buffer, unsigned long maxsize);
#endif /* _FAT_H_ */
Commit	Line	Data
71f95118 WD	1	/*
	2	* R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
	3	*
	4	* 2002-07-28 - [email protected] - ported to ppcboot v1.1.6
	5	* 2003-03-10 - [email protected] - 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
5cf91d6b WD	30	#include <asm/byteorder.h>
5cf91d6b WD	31
71f95118	32	#define CONFIG_SUPPORT_VFAT
3831530d MZ	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 */
025421ea	36	#define PREFETCH_BLOCKS 2
71f95118 WD	37
71f95118 WD	38	#define MAX_CLUSTSIZE 65536
ac497771 SS	39	#define DIRENTSPERBLOCK (mydata->sect_size / sizeof(dir_entry))
	40	#define DIRENTSPERCLUST ((mydata->clust_size * mydata->sect_size) / \
	41	sizeof(dir_entry))
71f95118 WD	42
71f95118 WD	43	#define FATBUFBLOCKS 6
ac497771	44	#define FATBUFSIZE (mydata->sect_size * FATBUFBLOCKS)
cd37d9e6	45	#define FAT12BUFSIZE ((FATBUFSIZE*2)/3)
71f95118 WD	46	#define FAT16BUFSIZE (FATBUFSIZE/2)
	47	#define FAT32BUFSIZE (FATBUFSIZE/4)
	48
	49
	50	/* Filesystem identifiers */
	51	#define FAT12_SIGN "FAT12 "
	52	#define FAT16_SIGN "FAT16 "
	53	#define FAT32_SIGN "FAT32 "
	54	#define SIGNLEN 8
	55
	56	/* File attributes */
7385c28e WD	57	#define ATTR_RO 1
	58	#define ATTR_HIDDEN 2
	59	#define ATTR_SYS 4
	60	#define ATTR_VOLUME 8
	61	#define ATTR_DIR 16
	62	#define ATTR_ARCH 32
71f95118	63
7385c28e	64	#define ATTR_VFAT (ATTR_RO \| ATTR_HIDDEN \| ATTR_SYS \| ATTR_VOLUME)
71f95118 WD	65
71f95118 WD	66	#define DELETED_FLAG ((char)0xe5) /* Marks deleted files when in name[0] */
3c2c2f42	67	#define aRING 0x05 /* Used as special character in name[0] */
71f95118	68
7385c28e WD	69	/*
7385c28e WD	70	* Indicates that the entry is the last long entry in a set of long
2d1a537d WD	71	* dir entries
	72	*/
	73	#define LAST_LONG_ENTRY_MASK 0x40
71f95118 WD	74
71f95118 WD	75	/* Flags telling whether we should read a file or list a directory */
7385c28e WD	76	#define LS_NO 0
	77	#define LS_YES 1
	78	#define LS_DIR 1
	79	#define LS_ROOT 2
71f95118	80
7385c28e	81	#define ISDIRDELIM(c) ((c) == '/' \|\| (c) == '\\')
71f95118 WD	82
	83	#define FSTYPE_NONE (-1)
	84
	85	#if defined(__linux__) && defined(__KERNEL__)
	86	#define FAT2CPU16 le16_to_cpu
	87	#define FAT2CPU32 le32_to_cpu
	88	#else
9fd5e31f	89	#if __LITTLE_ENDIAN
71f95118 WD	90	#define FAT2CPU16(x) (x)
	91	#define FAT2CPU32(x) (x)
	92	#else
	93	#define FAT2CPU16(x) ((((x) & 0x00ff) << 8) \| (((x) & 0xff00) >> 8))
	94	#define FAT2CPU32(x) ((((x) & 0x000000ff) << 24) \| \
53677ef1	95	(((x) & 0x0000ff00) << 8) \| \
71f95118 WD	96	(((x) & 0x00ff0000) >> 8) \| \
	97	(((x) & 0xff000000) >> 24))
	98	#endif
	99	#endif
	100
	101	#define TOLOWER(c) if((c) >= 'A' && (c) <= 'Z'){(c)+=('a' - 'A');}
c30a15e5 DK	102	#define TOUPPER(c) if ((c) >= 'a' && (c) <= 'z') \
c30a15e5 DK	103	(c) -= ('a' - 'A');
71f95118 WD	104	#define START(dent) (FAT2CPU16((dent)->start) \
	105	+ (mydata->fatsize != 32 ? 0 : \
	106	(FAT2CPU16((dent)->starthi) << 16)))
8ce4e5c2	107	#define CHECK_CLUST(x, fatsize) ((x) <= 1 \|\| \
8ce4e5c2	108	(x) >= ((fatsize) != 32 ? 0xfff0 : 0xffffff0))
71f95118 WD	109
	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) */
	125
	126	/* FAT32 only */
	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 */
	134	} boot_sector;
	135
	136	typedef struct volume_info
	137	{
	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 */
	146	} volume_info;
	147
	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 */
	159	} dir_entry;
	160
	161	typedef struct dir_slot {
7385c28e WD	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 */
71f95118 WD	170	} dir_slot;
71f95118 WD	171
7385c28e WD	172	/*
7385c28e WD	173	* Private filesystem parameters
80f0c0f5 WD	174	*
	175	* Note: FAT buffer has to be 32 bit aligned
	176	* (see FAT32 accesses)
	177	*/
71f95118	178	typedef struct {
ac497771	179	__u8 fatbuf; / Current FAT buffer */
71f95118	180	int fatsize; /* Size of FAT in bits */
1d90c3b4	181	__u32 fatlength; /* Length of FAT in sectors */
71f95118	182	__u16 fat_sect; /* Starting sector of the FAT */
1d90c3b4	183	__u32 rootdir_sect; /* Start sector of root directory */
ac497771	184	__u16 sect_size; /* Size of sectors in bytes */
71f95118	185	__u16 clust_size; /* Size of clusters in sectors */
1d90c3b4	186	int data_begin; /* The sector of the first cluster, can be negative */
71f95118 WD	187	int fatbufnum; /* Used by get_fatent, init to -1 */
	188	} fsdata;
	189
	190	typedef int (file_detectfs_func)(void);
	191	typedef int (file_ls_func)(const char *dir);
	192	typedef long (file_read_func)(const char filename, void buffer,
	193	unsigned long maxsize);
	194
	195	struct filesystem {
7385c28e WD	196	file_detectfs_func *detect;
	197	file_ls_func *ls;
	198	file_read_func *read;
	199	const char name[12];
71f95118 WD	200	};
	201
	202	/* FAT tables */
	203	file_detectfs_func file_fat_detectfs;
	204	file_ls_func file_fat_ls;
	205	file_read_func file_fat_read;
	206
	207	/* Currently this doesn't check if the dir exists or is valid... */
	208	int file_cd(const char *path);
	209	int file_fat_detectfs(void);
	210	int file_fat_ls(const char *dir);
1170e634 BT	211	long file_fat_read_at(const char filename, unsigned long pos, void buffer,
1170e634 BT	212	unsigned long maxsize);
71f95118 WD	213	long file_fat_read(const char filename, void buffer, unsigned long maxsize);
71f95118 WD	214	const char *file_getfsname(int idx);
5e8f9831	215	int fat_set_blk_dev(block_dev_desc_t rbdd, disk_partition_t info);
7205e407	216	int fat_register_device(block_dev_desc_t *dev_desc, int part_no);
71f95118	217
c30a15e5	218	int file_fat_write(const char filename, void buffer, unsigned long maxsize);
71f95118	219	#endif /* _FAT_H_ */