1 /* $NetBSD: bootsect.h,v 1.5 2012/11/04 17:57:59 jakllsch Exp $ */
4 * Written by Paul Popelka (paulp@uts.amdahl.com)
6 * You can do anything you want with this software, just don't say you wrote
7 * it, and don't remove this notice.
9 * This software is provided "as is".
11 * The author supplies this software to be publicly redistributed on the
12 * understanding that the author is not responsible for the correct
13 * functioning of this software in any circumstances and is not liable for
14 * any damages caused by this software.
18 #ifndef _MSDOSFS_BOOTSECT_H_
19 #define _MSDOSFS_BOOTSECT_H_
22 * Format of a boot sector. This is the first sector on a DOS floppy disk
23 * or the fist sector of a partition on a hard disk. But, it is not the
24 * first sector of a partitioned hard disk.
27 u_int8_t bsJump
[3]; /* jump inst E9xxxx or EBxx90 */
28 int8_t bsOemName
[8]; /* OEM name and version */
29 int8_t bsBPB
[19]; /* BIOS parameter block */
30 int8_t bsDriveNumber
; /* drive number (0x80) */
31 int8_t bsBootCode
[479]; /* pad so struct is 512b */
32 u_int8_t bsBootSectSig0
;
33 u_int8_t bsBootSectSig1
;
39 int8_t exDriveNumber
; /* drive number (0x80) */
40 int8_t exReserved1
; /* reserved */
41 int8_t exBootSignature
; /* ext. boot signature (0x29) */
42 #define EXBOOTSIG 0x29
43 int8_t exVolumeID
[4]; /* volume ID number */
44 int8_t exVolumeLabel
[11]; /* volume label */
45 int8_t exFileSysType
[8]; /* fs type (FAT12 or FAT16) */
49 u_int8_t bsJump
[3]; /* jump inst E9xxxx or EBxx90 */
50 int8_t bsOemName
[8]; /* OEM name and version */
51 int8_t bsBPB
[25]; /* BIOS parameter block */
52 int8_t bsExt
[26]; /* Bootsector Extension */
53 int8_t bsBootCode
[448]; /* pad so structure is 512b */
54 u_int8_t bsBootSectSig0
;
55 u_int8_t bsBootSectSig1
;
60 struct bootsector710
{
61 u_int8_t bsJump
[3]; /* jump inst E9xxxx or EBxx90 */
62 int8_t bsOEMName
[8]; /* OEM name and version */
63 int8_t bsBPB
[53]; /* BIOS parameter block */
64 int8_t bsExt
[26]; /* Bootsector Extension */
65 int8_t bsBootCode
[420]; /* pad so structure is 512b */
66 u_int8_t bsBootSectSig0
;
67 u_int8_t bsBootSectSig1
;
73 * The boot sector on a GEMDOS FS is a little bit different from the MSDOS FS
74 * format. Currently there is no need to declare a separate structure, the
75 * bootsector33 struct will do.
78 struct bootsec_atari
{
79 u_int8_t bsBranch
[2]; /* branch inst if auto-boot */
80 int8_t bsFiller
[6]; /* anything or nothing */
81 int8_t bsSerial
[3]; /* serial no. for mediachange */
82 int8_t bsBPB
[19]; /* BIOS parameter block */
83 int8_t bsBootCode
[482]; /* pad so struct is 512b */
89 struct bootsector33 bs33
;
90 struct bootsector50 bs50
;
91 struct bootsector710 bs710
;
96 * Shorthand for fields in the bpb.
98 #define bsBytesPerSec bsBPB.bpbBytesPerSec
99 #define bsSectPerClust bsBPB.bpbSectPerClust
100 #define bsResSectors bsBPB.bpbResSectors
101 #define bsFATS bsBPB.bpbFATS
102 #define bsRootDirEnts bsBPB.bpbRootDirEnts
103 #define bsSectors bsBPB.bpbSectors
104 #define bsMedia bsBPB.bpbMedia
105 #define bsFATsecs bsBPB.bpbFATsecs
106 #define bsSectPerTrack bsBPB.bpbSectPerTrack
107 #define bsHeads bsBPB.bpbHeads
108 #define bsHiddenSecs bsBPB.bpbHiddenSecs
109 #define bsHugeSectors bsBPB.bpbHugeSectors
112 #endif /* _MSDOSFS_BOOTSECT_H_ */