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.
19 #ifndef _FS_MSDOSFS_BOOTSECT_H_
20 #define _FS_MSDOSFS_BOOTSECT_H_
23 * Format of a boot sector. This is the first sector on a DOS floppy disk
24 * or the fist sector of a partition on a hard disk. But, it is not the
25 * first sector of a partitioned hard disk.
28 uint8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */
29 int8_t bsOemName[8]; /* OEM name and version */
30 int8_t bsBPB[19]; /* BIOS parameter block */
31 int8_t bsDriveNumber; /* drive number (0x80) */
32 int8_t bsBootCode[479]; /* pad so struct is 512b */
33 uint8_t bsBootSectSig0;
34 uint8_t bsBootSectSig1;
40 int8_t exDriveNumber; /* drive number (0x80) */
41 int8_t exReserved1; /* reserved */
42 int8_t exBootSignature; /* ext. boot signature (0x29) */
43 #define EXBOOTSIG 0x29
44 int8_t exVolumeID[4]; /* volume ID number */
45 int8_t exVolumeLabel[11]; /* volume label */
46 int8_t exFileSysType[8]; /* fs type (FAT12 or FAT16) */
50 uint8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */
51 int8_t bsOemName[8]; /* OEM name and version */
52 int8_t bsBPB[25]; /* BIOS parameter block */
53 int8_t bsExt[26]; /* Bootsector Extension */
54 int8_t bsBootCode[448]; /* pad so structure is 512b */
55 uint8_t bsBootSectSig0;
56 uint8_t bsBootSectSig1;
61 struct bootsector710 {
62 uint8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */
63 int8_t bsOEMName[8]; /* OEM name and version */
64 int8_t bsBPB[53]; /* BIOS parameter block */
65 int8_t bsExt[26]; /* Bootsector Extension */
66 int8_t bsBootCode[420]; /* pad so structure is 512b */
67 uint8_t bsBootSectSig0;
68 uint8_t bsBootSectSig1;
74 struct bootsector33 bs33;
75 struct bootsector50 bs50;
76 struct bootsector710 bs710;
81 * Shorthand for fields in the bpb.
83 #define bsBytesPerSec bsBPB.bpbBytesPerSec
84 #define bsSectPerClust bsBPB.bpbSectPerClust
85 #define bsResSectors bsBPB.bpbResSectors
86 #define bsFATS bsBPB.bpbFATS
87 #define bsRootDirEnts bsBPB.bpbRootDirEnts
88 #define bsSectors bsBPB.bpbSectors
89 #define bsMedia bsBPB.bpbMedia
90 #define bsFATsecs bsBPB.bpbFATsecs
91 #define bsSectPerTrack bsBPB.bpbSectPerTrack
92 #define bsHeads bsBPB.bpbHeads
93 #define bsHiddenSecs bsBPB.bpbHiddenSecs
94 #define bsHugeSectors bsBPB.bpbHugeSectors
97 #endif /* !_FS_MSDOSFS_BOOTSECT_H_ */