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97 lines
2.9 KiB
C
97 lines
2.9 KiB
C
/* $NetBSD: bootsect.h,v 1.9 1997/11/17 15:36:17 ws Exp $ */
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/*-
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* Written by Paul Popelka (paulp@uts.amdahl.com)
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*
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* You can do anything you want with this software, just don't say you wrote
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* it, and don't remove this notice.
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*
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* This software is provided "as is".
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*
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* The author supplies this software to be publicly redistributed on the
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* understanding that the author is not responsible for the correct
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* functioning of this software in any circumstances and is not liable for
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* any damages caused by this software.
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*
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* October 1992
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*/
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#ifndef _FS_MSDOSFS_BOOTSECT_H_
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#define _FS_MSDOSFS_BOOTSECT_H_
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/*
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* Format of a boot sector. This is the first sector on a DOS floppy disk
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* or the fist sector of a partition on a hard disk. But, it is not the
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* first sector of a partitioned hard disk.
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*/
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struct bootsector33 {
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uint8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */
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int8_t bsOemName[8]; /* OEM name and version */
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int8_t bsBPB[19]; /* BIOS parameter block */
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int8_t bsDriveNumber; /* drive number (0x80) */
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int8_t bsBootCode[479]; /* pad so struct is 512b */
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uint8_t bsBootSectSig0;
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uint8_t bsBootSectSig1;
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#define BOOTSIG0 0x55
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#define BOOTSIG1 0xaa
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};
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struct extboot {
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int8_t exDriveNumber; /* drive number (0x80) */
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int8_t exReserved1; /* reserved */
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int8_t exBootSignature; /* ext. boot signature (0x29) */
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#define EXBOOTSIG 0x29
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int8_t exVolumeID[4]; /* volume ID number */
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int8_t exVolumeLabel[11]; /* volume label */
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int8_t exFileSysType[8]; /* fs type (FAT12 or FAT16) */
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};
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struct bootsector50 {
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uint8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */
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int8_t bsOemName[8]; /* OEM name and version */
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int8_t bsBPB[25]; /* BIOS parameter block */
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int8_t bsExt[26]; /* Bootsector Extension */
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int8_t bsBootCode[448]; /* pad so structure is 512b */
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uint8_t bsBootSectSig0;
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uint8_t bsBootSectSig1;
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#define BOOTSIG0 0x55
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#define BOOTSIG1 0xaa
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};
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struct bootsector710 {
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uint8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */
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int8_t bsOEMName[8]; /* OEM name and version */
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int8_t bsBPB[53]; /* BIOS parameter block */
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int8_t bsExt[26]; /* Bootsector Extension */
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int8_t bsBootCode[420]; /* pad so structure is 512b */
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uint8_t bsBootSectSig0;
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uint8_t bsBootSectSig1;
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#define BOOTSIG0 0x55
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#define BOOTSIG1 0xaa
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};
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union bootsector {
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struct bootsector33 bs33;
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struct bootsector50 bs50;
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struct bootsector710 bs710;
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};
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#if 0
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/*
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* Shorthand for fields in the bpb.
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*/
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#define bsBytesPerSec bsBPB.bpbBytesPerSec
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#define bsSectPerClust bsBPB.bpbSectPerClust
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#define bsResSectors bsBPB.bpbResSectors
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#define bsFATS bsBPB.bpbFATS
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#define bsRootDirEnts bsBPB.bpbRootDirEnts
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#define bsSectors bsBPB.bpbSectors
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#define bsMedia bsBPB.bpbMedia
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#define bsFATsecs bsBPB.bpbFATsecs
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#define bsSectPerTrack bsBPB.bpbSectPerTrack
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#define bsHeads bsBPB.bpbHeads
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#define bsHiddenSecs bsBPB.bpbHiddenSecs
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#define bsHugeSectors bsBPB.bpbHugeSectors
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#endif
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#endif /* !_FS_MSDOSFS_BOOTSECT_H_ */
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