[J-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

#define SECTOR_SIZE FS_BLOCK_SIZE

#define FS_BLOCK_SIZE 512

#if FS_BLOCK_SIZE != SECTOR_SIZE
#error FS_BLOCK_SIZE != SECTOR_SIZE - This code needs to be fixed!
#endif

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

#define FATBUFBLOCKS	6
#define FATBUFSIZE	(FS_BLOCK_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

#ifdef DEBUG
#define FAT_DPRINT(args...)	printf(args)
#else
#define FAT_DPRINT(args...)
#endif
#define FAT_ERROR(arg)		printf(arg)

#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 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[FATBUFSIZE]; /* Current FAT buffer */
	int	fatsize;	/* Size of FAT in bits */
	__u16	fatlength;	/* Length of FAT in sectors */
	__u16	fat_sect;	/* Starting sector of the FAT */
	__u16	rootdir_sect;	/* Start sector of root directory */
	__u16	clust_size;	/* Size of clusters in sectors */
	short	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(const char *filename, void *buffer, unsigned long maxsize);
const char *file_getfsname(int idx);
int fat_register_device(block_dev_desc_t *dev_desc, int part_no);

#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 WD	32	#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)
cd37d9e6	48	#define FAT12BUFSIZE ((FATBUFSIZE*2)/3)
71f95118 WD	49	#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] */
3c2c2f42	70	#define aRING 0x05 /* Used as special character in name[0] */
71f95118	71
2d1a537d WD	72	/* 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
71f95118 WD	76
	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
9fd5e31f	98	#if __LITTLE_ENDIAN
71f95118 WD	99	#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) \| \
53677ef1	104	(((x) & 0x0000ff00) << 8) \| \
71f95118 WD	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)))
8ce4e5c2	114	#define CHECK_CLUST(x, fatsize) ((x) <= 1 \|\| \
8ce4e5c2	115	(x) >= ((fatsize) != 32 ? 0xfff0 : 0xffffff0))
71f95118 WD	116
	117	typedef struct boot_sector {
	118	__u8 ignored[3]; /* Bootstrap code */
	119	char system_id[8]; /* Name of fs */
	120	__u8 sector_size[2]; /* Bytes/sector */
	121	__u8 cluster_size; /* Sectors/cluster */
	122	__u16 reserved; /* Number of reserved sectors */
	123	__u8 fats; /* Number of FATs */
	124	__u8 dir_entries[2]; /* Number of root directory entries */
	125	__u8 sectors[2]; /* Number of sectors */
	126	__u8 media; /* Media code */
	127	__u16 fat_length; /* Sectors/FAT */
	128	__u16 secs_track; /* Sectors/track */
	129	__u16 heads; /* Number of heads */
	130	__u32 hidden; /* Number of hidden sectors */
	131	__u32 total_sect; /* Number of sectors (if sectors == 0) */
	132
	133	/* FAT32 only */
	134	__u32 fat32_length; /* Sectors/FAT */
	135	__u16 flags; /* Bit 8: fat mirroring, low 4: active fat */
	136	__u8 version[2]; /* Filesystem version */
	137	__u32 root_cluster; /* First cluster in root directory */
	138	__u16 info_sector; /* Filesystem info sector */
	139	__u16 backup_boot; /* Backup boot sector */
	140	__u16 reserved2[6]; /* Unused */
	141	} boot_sector;
	142
	143	typedef struct volume_info
	144	{
	145	__u8 drive_number; /* BIOS drive number */
	146	__u8 reserved; /* Unused */
	147	__u8 ext_boot_sign; /* 0x29 if fields below exist (DOS 3.3+) */
	148	__u8 volume_id[4]; /* Volume ID number */
	149	char volume_label[11]; /* Volume label */
	150	char fs_type[8]; /* Typically FAT12, FAT16, or FAT32 */
	151	/* Boot code comes next, all but 2 bytes to fill up sector */
	152	/* Boot sign comes last, 2 bytes */
	153	} volume_info;
	154
	155	typedef struct dir_entry {
	156	char name[8],ext[3]; /* Name and extension */
	157	__u8 attr; /* Attribute bits */
	158	__u8 lcase; /* Case for base and extension */
	159	__u8 ctime_ms; /* Creation time, milliseconds */
	160	__u16 ctime; /* Creation time */
	161	__u16 cdate; /* Creation date */
	162	__u16 adate; /* Last access date */
	163	__u16 starthi; /* High 16 bits of cluster in FAT32 */
	164	__u16 time,date,start;/* Time, date and first cluster */
	165	__u32 size; /* File size in bytes */
	166	} dir_entry;
	167
	168	typedef struct dir_slot {
	169	__u8 id; /* Sequence number for slot */
	170	__u8 name0_4[10]; /* First 5 characters in name */
	171	__u8 attr; /* Attribute byte */
	172	__u8 reserved; /* Unused */
	173	__u8 alias_checksum;/* Checksum for 8.3 alias */
	174	__u8 name5_10[12]; /* 6 more characters in name */
	175	__u16 start; /* Unused */
	176	__u8 name11_12[4]; /* Last 2 characters in name */
	177	} dir_slot;
	178
80f0c0f5 WD	179	/* Private filesystem parameters
	180	*
	181	* Note: FAT buffer has to be 32 bit aligned
	182	* (see FAT32 accesses)
	183	*/
71f95118	184	typedef struct {
80f0c0f5	185	__u8 fatbuf[FATBUFSIZE]; /* Current FAT buffer */
71f95118 WD	186	int fatsize; /* Size of FAT in bits */
	187	__u16 fatlength; /* Length of FAT in sectors */
	188	__u16 fat_sect; /* Starting sector of the FAT */
	189	__u16 rootdir_sect; /* Start sector of root directory */
	190	__u16 clust_size; /* Size of clusters in sectors */
cd37d9e6	191	short data_begin; /* The sector of the first cluster, can be negative */
71f95118 WD	192	int fatbufnum; /* Used by get_fatent, init to -1 */
	193	} fsdata;
	194
	195	typedef int (file_detectfs_func)(void);
	196	typedef int (file_ls_func)(const char *dir);
	197	typedef long (file_read_func)(const char filename, void buffer,
	198	unsigned long maxsize);
	199
	200	struct filesystem {
	201	file_detectfs_func *detect;
	202	file_ls_func *ls;
	203	file_read_func *read;
	204	const char name[12];
	205	};
	206
	207	/* FAT tables */
	208	file_detectfs_func file_fat_detectfs;
	209	file_ls_func file_fat_ls;
	210	file_read_func file_fat_read;
	211
	212	/* Currently this doesn't check if the dir exists or is valid... */
	213	int file_cd(const char *path);
	214	int file_fat_detectfs(void);
	215	int file_fat_ls(const char *dir);
	216	long file_fat_read(const char filename, void buffer, unsigned long maxsize);
	217	const char *file_getfsname(int idx);
7205e407	218	int fat_register_device(block_dev_desc_t *dev_desc, int part_no);
71f95118 WD	219
71f95118 WD	220	#endif /* _FAT_H_ */