diff options
Diffstat (limited to 'package/aboot/src/srmbootfat/msdos.h')
| -rw-r--r-- | package/aboot/src/srmbootfat/msdos.h | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/package/aboot/src/srmbootfat/msdos.h b/package/aboot/src/srmbootfat/msdos.h new file mode 100644 index 000000000..60b3ca29a --- /dev/null +++ b/package/aboot/src/srmbootfat/msdos.h @@ -0,0 +1,160 @@ +#ifndef MTOOLS_MSDOS_H +#define MTOOLS_MSDOS_H + +/* + * msdos common header file + */ + +#define MAX_SECTOR 8192 /* largest sector size */ +#define MDIR_SIZE 32 /* MSDOS directory entry size in bytes*/ +#define MAX_CLUSTER 8192 /* largest cluster size */ +#define MAX_PATH 128 /* largest MSDOS path length */ +#define MAX_DIR_SECS 64 /* largest directory (in sectors) */ + +#define NEW 1 +#define OLD 0 + +#define _WORD(x) ((unsigned char)(x)[0] + (((unsigned char)(x)[1]) << 8)) +#define _DWORD(x) (_WORD(x) + (_WORD((x)+2) << 16)) + +#define DELMARK ((char) 0xe5) + +struct directory { + char name[8]; /* 0 file name */ + char ext[3]; /* 8 file extension */ + unsigned char attr; /* 11 attribute byte */ + unsigned char Case; /* 12 case of short filename */ + unsigned char ctime_ms; /* 13 creation time, milliseconds (?) */ + unsigned char ctime[2]; /* 14 creation time */ + unsigned char cdate[2]; /* 16 creation date */ + unsigned char adate[2]; /* 18 last access date */ + unsigned char startHi[2]; /* 20 start cluster, Hi */ + unsigned char time[2]; /* 22 time stamp */ + unsigned char date[2]; /* 24 date stamp */ + unsigned char start[2]; /* 26 starting cluster number */ + unsigned char size[4]; /* 28 size of the file */ +}; + +#define EXTCASE 0x10 +#define BASECASE 0x8 + +#define MAX32 0xffffffff +#define MAX_SIZE 0x7fffffff + + + +typedef struct InfoSector_t { + unsigned char signature0[4]; + unsigned char filler[0x1e0]; + unsigned char signature[4]; + unsigned char count[4]; + unsigned char pos[4]; +} InfoSector_t; + +#define INFOSECT_SIGNATURE0 0x41615252 +#define INFOSECT_SIGNATURE 0x61417272 + + +/* FAT32 specific info in the bootsector */ +typedef struct fat32_t { + unsigned char bigFat[4]; /* 36 nb of sectors per FAT */ + unsigned char extFlags[2]; /* 40 extension flags */ + unsigned char fsVersion[2]; /* 42 ? */ + unsigned char rootCluster[4]; /* 44 start cluster of root dir */ + unsigned char infoSector[2]; /* 48 changeable global info */ + unsigned char backupBoot[2]; /* 50 back up boot sector */ + unsigned char reserved[6]; /* 52 ? */ +} fat32; /* ends at 58 */ + +typedef struct oldboot_t { + unsigned char physdrive; /* 36 physical drive ? */ + unsigned char reserved; /* 37 reserved */ + unsigned char dos4; /* 38 dos > 4.0 diskette */ + unsigned char serial[4]; /* 39 serial number */ + char label[11]; /* 43 disk label */ + char fat_type[8]; /* 54 FAT type */ + + unsigned char res_2m; /* 62 reserved by 2M */ + unsigned char CheckSum; /* 63 2M checksum (not used) */ + unsigned char fmt_2mf; /* 64 2MF format version */ + unsigned char wt; /* 65 1 if write track after format */ + unsigned char rate_0; /* 66 data transfer rate on track 0 */ + unsigned char rate_any; /* 67 data transfer rate on track<>0 */ + unsigned char BootP[2]; /* 68 offset to boot program */ + unsigned char Infp0[2]; /* 70 T1: information for track 0 */ + unsigned char InfpX[2]; /* 72 T2: information for track<>0 */ + unsigned char InfTm[2]; /* 74 T3: track sectors size table */ + unsigned char DateF[2]; /* 76 Format date */ + unsigned char TimeF[2]; /* 78 Format time */ + unsigned char junk[1024 - 80]; /* 80 remaining data */ +} oldboot_t; + +struct bootsector { + unsigned char jump[3]; /* 0 Jump to boot code */ + char banner[8]; /* 3 OEM name & version */ + unsigned char secsiz[2]; /* 11 Bytes per sector hopefully 512 */ + unsigned char clsiz; /* 13 Cluster size in sectors */ + unsigned char nrsvsect[2]; /* 14 Number of reserved (boot) sectors */ + unsigned char nfat; /* 16 Number of FAT tables hopefully 2 */ + unsigned char dirents[2]; /* 17 Number of directory slots */ + unsigned char psect[2]; /* 19 Total sectors on disk */ + unsigned char descr; /* 21 Media descriptor=first byte of FAT */ + unsigned char fatlen[2]; /* 22 Sectors in FAT */ + unsigned char nsect[2]; /* 24 Sectors/track */ + unsigned char nheads[2]; /* 26 Heads */ + unsigned char nhs[4]; /* 28 number of hidden sectors */ + unsigned char bigsect[4]; /* 32 big total sectors */ + + union { + struct fat32_t fat32; + struct oldboot_t old; + } ext; +}; + +extern struct OldDos_t { + unsigned int tracks; + unsigned int sectors; + unsigned int heads; + + unsigned int dir_len; + unsigned int cluster_size; + unsigned int fat_len; + + unsigned int media; +} old_dos[]; + +#define FAT12 4085 /* max. number of clusters described by a 12 bit FAT */ +#define FAT16 65525 + +#define MAX_SECT_PER_CLUSTER 64 +/* Experimentally, it turns out that DOS only accepts cluster sizes + * which are powers of two, and less than 128 sectors (else it gets a + * divide overflow) */ + + +#define FAT_SIZE(bits, sec_siz, clusters) \ + ((((clusters)+2) * ((bits)/4) - 1) / 2 / (sec_siz) + 1) + +#define NEEDED_FAT_SIZE(x) FAT_SIZE((x)->fat_bits, (x)->sector_size, \ + (x)->num_clus) + +/* disk size taken by FAT and clusters */ +#define DISK_SIZE(bits, sec_siz, clusters, n, cluster_size) \ + ((n) * FAT_SIZE(bits, sec_siz, clusters) + \ + (clusters) * (cluster_size)) + +#define TOTAL_DISK_SIZE(bits, sec_siz, clusters, n, cluster_size) \ + (DISK_SIZE(bits, sec_siz, clusters, n, cluster_size) + 2) +/* approx. total disk size: assume 1 boot sector and one directory sector */ + +extern const char *mversion; +extern const char *mdate; + + + +int init(char drive, int mode); + +#define MT_READ 1 +#define MT_WRITE 2 + +#endif |