--- /dev/null
+/*
+ * 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
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#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 START(dent) (FAT2CPU16((dent)->start) \
+ + (mydata->fatsize != 32 ? 0 : \
+ (FAT2CPU16((dent)->starthi) << 16)))
+#define IS_LAST_CLUST(x, fatsize) ((x) >= ((fatsize) != 32 ? \
+ ((fatsize) != 16 ? 0xff8 : 0xfff8) : \
+ 0xffffff8))
+#define CHECK_CLUST(x, fatsize) ((x) <= 1 || \
+ (x) >= ((fatsize) != 32 ? \
+ ((fatsize) != 16 ? 0xff0 : 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);
+int fat_exists(const char *filename);
+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);
+int fat_read_file(const char *filename, void *buf, int offset, int len);
+void fat_close(void);
+#endif /* _FAT_H_ */
Code Review / kvmfornfv.git / blobdiff