1 /* $FreeBSD: src/sys/msdosfs/bootsect.h,v 1.7 1999/08/28 00:48:06 peter Exp $ */
2 /* $NetBSD: bootsect.h,v 1.9 1997/11/17 15:36:17 ws Exp $ */
5 * Written by Paul Popelka (paulp@uts.amdahl.com)
7 * You can do anything you want with this software, just don't say you wrote
8 * it, and don't remove this notice.
10 * This software is provided "as is".
12 * The author supplies this software to be publicly redistributed on the
13 * understanding that the author is not responsible for the correct
14 * functioning of this software in any circumstances and is not liable for
15 * any damages caused by this software.
20 #ifndef _VFS_MSDOSFS_BOOTSECT_H_
21 #define _VFS_MSDOSFS_BOOTSECT_H_
24 * Format of a boot sector. This is the first sector on a DOS floppy disk
25 * or the fist sector of a partition on a hard disk. But, it is not the
26 * first sector of a partitioned hard disk.
29 u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */
30 int8_t bsOemName[8]; /* OEM name and version */
31 int8_t bsBPB[19]; /* BIOS parameter block */
32 int8_t bsDriveNumber; /* drive number (0x80) */
33 int8_t bsBootCode[479]; /* pad so struct is 512b */
34 u_int8_t bsBootSectSig0;
35 u_int8_t bsBootSectSig1;
41 int8_t exDriveNumber; /* drive number (0x80) */
42 int8_t exReserved1; /* reserved */
43 int8_t exBootSignature; /* ext. boot signature (0x29) */
44 #define EXBOOTSIG 0x29
45 #define EXBOOTSIG2 0x28
46 int8_t exVolumeID[4]; /* volume ID number */
47 int8_t exVolumeLabel[11]; /* volume label */
48 int8_t exFileSysType[8]; /* fs type (FAT12 or FAT16) */
52 u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */
53 int8_t bsOemName[8]; /* OEM name and version */
54 int8_t bsBPB[25]; /* BIOS parameter block */
55 int8_t bsExt[26]; /* Bootsector Extension */
56 int8_t bsBootCode[448]; /* pad so structure is 512b */
57 u_int8_t bsBootSectSig0;
58 u_int8_t bsBootSectSig1;
63 struct bootsector710 {
64 u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */
65 int8_t bsOEMName[8]; /* OEM name and version */
66 int8_t bsPBP[53]; /* BIOS parameter block */
67 int8_t bsExt[26]; /* Bootsector Extension */
68 int8_t bsBootCode[418]; /* pad so structure is 512b */
69 u_int8_t bsBootSectSig2; /* 2 & 3 are only defined for FAT32? */
70 u_int8_t bsBootSectSig3;
71 u_int8_t bsBootSectSig0;
72 u_int8_t bsBootSectSig1;
80 * The boot sector on a gemdos fs is a little bit different from the msdos fs
81 * format. Currently there is no need to declare a separate structure, the
82 * bootsector33 struct will do.
85 struct bootsec_atari {
86 u_int8_t bsBranch[2]; /* branch inst if auto-boot */
87 int8_t bsFiller[6]; /* anything or nothing */
88 int8_t bsSerial[3]; /* serial no. for mediachange */
89 int8_t bsBPB[19]; /* BIOS parameter block */
90 int8_t bsBootCode[482]; /* pad so struct is 512b */
96 struct bootsector33 bs33;
97 struct bootsector50 bs50;
98 struct bootsector710 bs710;
103 * Shorthand for fields in the bpb.
105 #define bsBytesPerSec bsBPB.bpbBytesPerSec
106 #define bsSectPerClust bsBPB.bpbSectPerClust
107 #define bsResSectors bsBPB.bpbResSectors
108 #define bsFATS bsBPB.bpbFATS
109 #define bsRootDirEnts bsBPB.bpbRootDirEnts
110 #define bsSectors bsBPB.bpbSectors
111 #define bsMedia bsBPB.bpbMedia
112 #define bsFATsecs bsBPB.bpbFATsecs
113 #define bsSectPerTrack bsBPB.bpbSectPerTrack
114 #define bsHeads bsBPB.bpbHeads
115 #define bsHiddenSecs bsBPB.bpbHiddenSecs
116 #define bsHugeSectors bsBPB.bpbHugeSectors
119 #endif /* !_VFS_MSDOSFS_BOOTSECT_H_ */