216 lines
6.6 KiB
C
216 lines
6.6 KiB
C
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/*
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* R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
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*
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* 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
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* 2003-03-10 - kharris@nexus-tech.net - ported to u-boot
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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#ifndef _FAT_H_
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#define _FAT_H_
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#include <asm/byteorder.h>
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#define CONFIG_SUPPORT_VFAT
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#define SECTOR_SIZE FS_BLOCK_SIZE
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#define FS_BLOCK_SIZE 512
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#if FS_BLOCK_SIZE != SECTOR_SIZE
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#error FS_BLOCK_SIZE != SECTOR_SIZE - This code needs to be fixed!
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#endif
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#define MAX_CLUSTSIZE 65536
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#define DIRENTSPERBLOCK (FS_BLOCK_SIZE/sizeof(dir_entry))
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#define DIRENTSPERCLUST ((mydata->clust_size*SECTOR_SIZE)/sizeof(dir_entry))
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#define FATBUFBLOCKS 6
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#define FATBUFSIZE (FS_BLOCK_SIZE*FATBUFBLOCKS)
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#define FAT12BUFSIZE ((FATBUFSIZE*2)/3)
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#define FAT16BUFSIZE (FATBUFSIZE/2)
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#define FAT32BUFSIZE (FATBUFSIZE/4)
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/* Filesystem identifiers */
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#define FAT12_SIGN "FAT12 "
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#define FAT16_SIGN "FAT16 "
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#define FAT32_SIGN "FAT32 "
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#define SIGNLEN 8
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/* File attributes */
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#define ATTR_RO 1
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#define ATTR_HIDDEN 2
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#define ATTR_SYS 4
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#define ATTR_VOLUME 8
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#define ATTR_DIR 16
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#define ATTR_ARCH 32
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#define ATTR_VFAT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
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#define DELETED_FLAG ((char)0xe5) /* Marks deleted files when in name[0] */
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#define aRING 0x05 /* Used to represent '<27>' in name[0] */
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/* Indicates that the entry is the last long entry in a set of long
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* dir entries
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*/
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#define LAST_LONG_ENTRY_MASK 0x40
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/* Flags telling whether we should read a file or list a directory */
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#define LS_NO 0
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#define LS_YES 1
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#define LS_DIR 1
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#define LS_ROOT 2
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#ifdef DEBUG
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#define FAT_DPRINT(args...) printf(args)
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#else
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#define FAT_DPRINT(args...)
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#endif
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#define FAT_ERROR(arg) printf(arg)
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#define ISDIRDELIM(c) ((c) == '/' || (c) == '\\')
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#define FSTYPE_NONE (-1)
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#if defined(__linux__) && defined(__KERNEL__)
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#define FAT2CPU16 le16_to_cpu
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#define FAT2CPU32 le32_to_cpu
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#else
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#if __LITTLE_ENDIAN
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#define FAT2CPU16(x) (x)
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#define FAT2CPU32(x) (x)
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#else
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#define FAT2CPU16(x) ((((x) & 0x00ff) << 8) | (((x) & 0xff00) >> 8))
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#define FAT2CPU32(x) ((((x) & 0x000000ff) << 24) | \
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(((x) & 0x0000ff00) << 8) | \
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(((x) & 0x00ff0000) >> 8) | \
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(((x) & 0xff000000) >> 24))
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#endif
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#endif
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#define TOLOWER(c) if((c) >= 'A' && (c) <= 'Z'){(c)+=('a' - 'A');}
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#define START(dent) (FAT2CPU16((dent)->start) \
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+ (mydata->fatsize != 32 ? 0 : \
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(FAT2CPU16((dent)->starthi) << 16)))
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typedef struct boot_sector {
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__u8 ignored[3]; /* Bootstrap code */
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char system_id[8]; /* Name of fs */
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__u8 sector_size[2]; /* Bytes/sector */
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__u8 cluster_size; /* Sectors/cluster */
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__u16 reserved; /* Number of reserved sectors */
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__u8 fats; /* Number of FATs */
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__u8 dir_entries[2]; /* Number of root directory entries */
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__u8 sectors[2]; /* Number of sectors */
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__u8 media; /* Media code */
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__u16 fat_length; /* Sectors/FAT */
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__u16 secs_track; /* Sectors/track */
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__u16 heads; /* Number of heads */
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__u32 hidden; /* Number of hidden sectors */
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__u32 total_sect; /* Number of sectors (if sectors == 0) */
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/* FAT32 only */
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__u32 fat32_length; /* Sectors/FAT */
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__u16 flags; /* Bit 8: fat mirroring, low 4: active fat */
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__u8 version[2]; /* Filesystem version */
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__u32 root_cluster; /* First cluster in root directory */
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__u16 info_sector; /* Filesystem info sector */
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__u16 backup_boot; /* Backup boot sector */
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__u16 reserved2[6]; /* Unused */
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} boot_sector;
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typedef struct volume_info
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{
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__u8 drive_number; /* BIOS drive number */
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__u8 reserved; /* Unused */
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__u8 ext_boot_sign; /* 0x29 if fields below exist (DOS 3.3+) */
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__u8 volume_id[4]; /* Volume ID number */
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char volume_label[11]; /* Volume label */
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char fs_type[8]; /* Typically FAT12, FAT16, or FAT32 */
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/* Boot code comes next, all but 2 bytes to fill up sector */
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/* Boot sign comes last, 2 bytes */
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} volume_info;
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typedef struct dir_entry {
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char name[8],ext[3]; /* Name and extension */
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__u8 attr; /* Attribute bits */
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__u8 lcase; /* Case for base and extension */
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__u8 ctime_ms; /* Creation time, milliseconds */
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__u16 ctime; /* Creation time */
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__u16 cdate; /* Creation date */
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__u16 adate; /* Last access date */
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__u16 starthi; /* High 16 bits of cluster in FAT32 */
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__u16 time,date,start;/* Time, date and first cluster */
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__u32 size; /* File size in bytes */
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} dir_entry;
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typedef struct dir_slot {
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__u8 id; /* Sequence number for slot */
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__u8 name0_4[10]; /* First 5 characters in name */
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__u8 attr; /* Attribute byte */
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__u8 reserved; /* Unused */
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__u8 alias_checksum;/* Checksum for 8.3 alias */
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__u8 name5_10[12]; /* 6 more characters in name */
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__u16 start; /* Unused */
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__u8 name11_12[4]; /* Last 2 characters in name */
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} dir_slot;
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/* Private filesystem parameters */
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typedef struct {
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int fatsize; /* Size of FAT in bits */
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__u16 fatlength; /* Length of FAT in sectors */
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__u16 fat_sect; /* Starting sector of the FAT */
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__u16 rootdir_sect; /* Start sector of root directory */
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__u16 clust_size; /* Size of clusters in sectors */
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short data_begin; /* The sector of the first cluster, can be negative */
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__u8 fatbuf[FATBUFSIZE]; /* Current FAT buffer */
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int fatbufnum; /* Used by get_fatent, init to -1 */
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} fsdata;
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typedef int (file_detectfs_func)(void);
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typedef int (file_ls_func)(const char *dir);
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typedef long (file_read_func)(const char *filename, void *buffer,
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unsigned long maxsize);
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struct filesystem {
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file_detectfs_func *detect;
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file_ls_func *ls;
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file_read_func *read;
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const char name[12];
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};
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/* FAT tables */
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file_detectfs_func file_fat_detectfs;
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file_ls_func file_fat_ls;
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file_read_func file_fat_read;
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/* Currently this doesn't check if the dir exists or is valid... */
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int file_cd(const char *path);
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int file_fat_detectfs(void);
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int file_fat_ls(const char *dir);
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long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);
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const char *file_getfsname(int idx);
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int fat_register_device(block_dev_desc_t *dev_desc, int part_no);
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#endif /* _FAT_H_ */
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