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Length: 2856 (0xb28)
Types: TextFile
Notes: UNIX file
Names: »dosbpb.h«
└─⟦a6ab2eb36⟧ Bits:30004042/kconfig3.imd SW95705I 386/ix Multi-user Release 1.2
└─⟦a6ab2eb36⟧ UNIX Filesystem
└─⟦this⟧ »kc/new/usr/include/sys/fs/dosbpb.h«
/*
* Copyrighted as an unpublished work.
* (c) Copyright 1987, 1988 INTERACTIVE Systems Corporation
* All rights reserved.
*
* RESTRICTED RIGHTS
*
* These programs are supplied under a license. They may be used,
* disclosed, and/or copied only as permitted under such license
* agreement. Any copy must contain the above copyright notice and
* this restricted rights notice. Use, copying, and/or disclosure
* of the programs is strictly prohibited unless otherwise provided
* in the license agreement.
*
*/
#ident "@(#)dosbpb.h 1.3 - 88/03/16"
#ident "@(#) (c) Copyright INTERACTIVE Systems Corporation 1987, 1988"
/*
* BIOS Parameter Block structure.
* Words are declared as two element char arrays for correct alignment.
*/
struct bpb {
unchar b_bps[2]; /* bytes per sector */
unchar b_spc; /* sectors per cluster */
unchar b_nrsrvd[2]; /* number of reserved sectors */
unchar b_nfat; /* number of FATs */
unchar b_nrde[2]; /* number of root directory entries */
unchar b_nsctr[2]; /* number of sectors in logical volume */
unchar b_mediadscr; /* media descriptor (FAT id byte) */
unchar b_spf[2]; /* sectors per FAT */
unchar b_spt[2]; /* sectors per track */
unchar b_nhds[2]; /* number of heads */
unchar b_nhddn[2]; /* number of hidden sectors */
};
/* macro to get a word out of a 2 character field in the BPB */
#define bpbword(x) (*((ushort *)x))
#define BPBOFFSET 0xB /* offset of the BPB in the boot block */
#define PARTOFFSET 0x1BE /* partition table offs in blk 0 of unit*/
#define SIGNOFFSET 0x1FE /* offset of the DOS signature */
#define DOS_ID1 0xE9 /* JMP intrasegment */
#define DOS_ID2 0xEB /* JMP short */
#define DOS_SIGN 0xAA55 /* DOS signature in boot and partition */
#define MEDIA_HARD 0xF8 /* Hard disk media descriptor */
#define MEDIA_2_15 0xF9 /* Floppy 2 sides, 15 sec/track */
#define MEDIA_1_9 0xFC /* Floppy 1 sides, 9 sec/track */
#define MEDIA_2_9 0xFD /* Floppy 2 sides, 9 sec/track */
#define MEDIA_1_8 0xFE /* Floppy 1 sides, 8 sec/track */
#define MEDIA_2_8 0xFF /* Floppy 2 sides, 8 sec/track */
#define DOS_NUMPART 4 /* Number of partitions in blk 0 of unit*/
#define DOS_SYSFAT12 1 /* DOS FAT 12 system ID */
#define DOS_SYSFAT16 4 /* DOS FAT 16 system ID */
#define DOS_F12MAXS 20740 /* Max sector for 12 Bit FAT (DOS>=3.2) */
#define DOS_F12MAXC 4086 /* Max cluster for 12 Bit FAT (DOS>=3.2)*/