1 /* $FreeBSD: src/sys/msdosfs/bootsect.h,v 1.7 1999/08/28 00:48:06 peter Exp $ */
2 /* $DragonFly: src/sys/vfs/msdosfs/bootsect.h,v 1.3 2004/01/08 18:39:18 asmodai Exp $ */
3 /* $NetBSD: bootsect.h,v 1.9 1997/11/17 15:36:17 ws Exp $ */
6 * Written by Paul Popelka (paulp@uts.amdahl.com)
8 * You can do anything you want with this software, just don't say you wrote
9 * it, and don't remove this notice.
11 * This software is provided "as is".
13 * The author supplies this software to be publicly redistributed on the
14 * understanding that the author is not responsible for the correct
15 * functioning of this software in any circumstances and is not liable for
16 * any damages caused by this software.
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 #define EXBOOTSIG2 0x28
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 u_int8_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 u_int8_t bsBootSectSig0;
56 u_int8_t bsBootSectSig1;
61 struct bootsector710 {
62 u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */
63 int8_t bsOEMName[8]; /* OEM name and version */
64 int8_t bsPBP[53]; /* BIOS parameter block */
65 int8_t bsExt[26]; /* Bootsector Extension */
66 int8_t bsBootCode[418]; /* pad so structure is 512b */
67 u_int8_t bsBootSectSig2; /* 2 & 3 are only defined for FAT32? */
68 u_int8_t bsBootSectSig3;
69 u_int8_t bsBootSectSig0;
70 u_int8_t bsBootSectSig1;
78 * The boot sector on a gemdos fs is a little bit different from the msdos fs
79 * format. Currently there is no need to declare a separate structure, the
80 * bootsector33 struct will do.
83 struct bootsec_atari {
84 u_int8_t bsBranch[2]; /* branch inst if auto-boot */
85 int8_t bsFiller[6]; /* anything or nothing */
86 int8_t bsSerial[3]; /* serial no. for mediachange */
87 int8_t bsBPB[19]; /* BIOS parameter block */
88 int8_t bsBootCode[482]; /* pad so struct is 512b */
94 struct bootsector33 bs33;
95 struct bootsector50 bs50;
96 struct bootsector710 bs710;
101 * Shorthand for fields in the bpb.
103 #define bsBytesPerSec bsBPB.bpbBytesPerSec
104 #define bsSectPerClust bsBPB.bpbSectPerClust
105 #define bsResSectors bsBPB.bpbResSectors
106 #define bsFATS bsBPB.bpbFATS
107 #define bsRootDirEnts bsBPB.bpbRootDirEnts
108 #define bsSectors bsBPB.bpbSectors
109 #define bsMedia bsBPB.bpbMedia
110 #define bsFATsecs bsBPB.bpbFATsecs
111 #define bsSectPerTrack bsBPB.bpbSectPerTrack
112 #define bsHeads bsBPB.bpbHeads
113 #define bsHiddenSecs bsBPB.bpbHiddenSecs
114 #define bsHugeSectors bsBPB.bpbHugeSectors