mirror of
https://github.com/u-boot/u-boot.git
synced 2024-11-30 08:03:32 +08:00
8ce4e5c2c0
This fixes the cluster size tests in the FAT32 file system. The current implementation of VFAT support doesn't work if the referred cluster has an offset > 16bit representation, causing "fatload" and "fatls" commands etc. to fail. Signed-off-by: michael trimarchi <trimarchi@gandalf.sssup.it>
221 lines
6.8 KiB
C
221 lines
6.8 KiB
C
/*
|
||
* R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
|
||
*
|
||
* 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
|
||
* 2003-03-10 - kharris@nexus-tech.net - 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 to represent '<27>' 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_ */
|