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| 1 | 13 | up20180614 | /* $NetBSD: bootsect.h,v 1.5 2012/11/04 17:57:59 jakllsch Exp $ */
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| 2 | |||
| 3 | /*
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| 4 | * Written by Paul Popelka (paulp@uts.amdahl.com)
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| 5 | *
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| 6 | * You can do anything you want with this software, just don't say you wrote
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| 7 | * it, and don't remove this notice.
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| 8 | *
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| 9 | * This software is provided "as is".
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| 10 | *
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| 11 | * The author supplies this software to be publicly redistributed on the
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| 12 | * understanding that the author is not responsible for the correct
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| 13 | * functioning of this software in any circumstances and is not liable for
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| 14 | * any damages caused by this software.
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| 15 | *
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| 16 | * October 1992
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| 17 | */
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| 18 | #ifndef _MSDOSFS_BOOTSECT_H_
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| 19 | #define _MSDOSFS_BOOTSECT_H_
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| 20 | |||
| 21 | /*
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| 22 | * Format of a boot sector. This is the first sector on a DOS floppy disk
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| 23 | * or the fist sector of a partition on a hard disk. But, it is not the
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| 24 | * first sector of a partitioned hard disk.
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| 25 | */
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| 26 | struct bootsector33 {
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| 27 | u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ |
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| 28 | int8_t bsOemName[8]; /* OEM name and version */ |
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| 29 | int8_t bsBPB[19]; /* BIOS parameter block */ |
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| 30 | int8_t bsDriveNumber; /* drive number (0x80) */
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| 31 | int8_t bsBootCode[479]; /* pad so struct is 512b */ |
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| 32 | u_int8_t bsBootSectSig0; |
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| 33 | u_int8_t bsBootSectSig1; |
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| 34 | #define BOOTSIG0 0x55 |
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| 35 | #define BOOTSIG1 0xaa |
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| 36 | }; |
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| 37 | |||
| 38 | struct extboot {
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| 39 | int8_t exDriveNumber; /* drive number (0x80) */
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| 40 | int8_t exReserved1; /* reserved */
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| 41 | int8_t exBootSignature; /* ext. boot signature (0x29) */
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| 42 | #define EXBOOTSIG 0x29 |
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| 43 | int8_t exVolumeID[4]; /* volume ID number */ |
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| 44 | int8_t exVolumeLabel[11]; /* volume label */ |
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| 45 | int8_t exFileSysType[8]; /* fs type (FAT12 or FAT16) */ |
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| 46 | }; |
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| 47 | |||
| 48 | struct bootsector50 {
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| 49 | u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ |
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| 50 | int8_t bsOemName[8]; /* OEM name and version */ |
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| 51 | int8_t bsBPB[25]; /* BIOS parameter block */ |
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| 52 | int8_t bsExt[26]; /* Bootsector Extension */ |
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| 53 | int8_t bsBootCode[448]; /* pad so structure is 512b */ |
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| 54 | u_int8_t bsBootSectSig0; |
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| 55 | u_int8_t bsBootSectSig1; |
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| 56 | #define BOOTSIG0 0x55 |
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| 57 | #define BOOTSIG1 0xaa |
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| 58 | }; |
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| 59 | |||
| 60 | struct bootsector710 {
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| 61 | u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ |
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| 62 | int8_t bsOEMName[8]; /* OEM name and version */ |
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| 63 | int8_t bsBPB[53]; /* BIOS parameter block */ |
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| 64 | int8_t bsExt[26]; /* Bootsector Extension */ |
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| 65 | int8_t bsBootCode[420]; /* pad so structure is 512b */ |
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| 66 | u_int8_t bsBootSectSig0; |
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| 67 | u_int8_t bsBootSectSig1; |
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| 68 | #define BOOTSIG0 0x55 |
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| 69 | #define BOOTSIG1 0xaa |
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| 70 | }; |
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| 71 | #ifdef atari
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| 72 | /*
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| 73 | * The boot sector on a GEMDOS FS is a little bit different from the MSDOS FS
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| 74 | * format. Currently there is no need to declare a separate structure, the
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| 75 | * bootsector33 struct will do.
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| 76 | */
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| 77 | #if 0
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| 78 | struct bootsec_atari {
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| 79 | u_int8_t bsBranch[2]; /* branch inst if auto-boot */
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| 80 | int8_t bsFiller[6]; /* anything or nothing */
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| 81 | int8_t bsSerial[3]; /* serial no. for mediachange */
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| 82 | int8_t bsBPB[19]; /* BIOS parameter block */
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| 83 | int8_t bsBootCode[482]; /* pad so struct is 512b */
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| 84 | };
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| 85 | #endif
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| 86 | #endif /* atari */ |
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| 87 | |||
| 88 | union bootsector {
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| 89 | struct bootsector33 bs33;
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| 90 | struct bootsector50 bs50;
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| 91 | struct bootsector710 bs710;
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| 92 | }; |
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| 93 | |||
| 94 | #if 0
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| 95 | /*
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| 96 | * Shorthand for fields in the bpb.
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| 97 | */
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| 98 | #define bsBytesPerSec bsBPB.bpbBytesPerSec
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| 99 | #define bsSectPerClust bsBPB.bpbSectPerClust
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| 100 | #define bsResSectors bsBPB.bpbResSectors
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| 101 | #define bsFATS bsBPB.bpbFATS
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| 102 | #define bsRootDirEnts bsBPB.bpbRootDirEnts
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| 103 | #define bsSectors bsBPB.bpbSectors
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| 104 | #define bsMedia bsBPB.bpbMedia
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| 105 | #define bsFATsecs bsBPB.bpbFATsecs
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| 106 | #define bsSectPerTrack bsBPB.bpbSectPerTrack
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| 107 | #define bsHeads bsBPB.bpbHeads
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| 108 | #define bsHiddenSecs bsBPB.bpbHiddenSecs
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| 109 | #define bsHugeSectors bsBPB.bpbHugeSectors
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| 110 | #endif
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| 111 | |||
| 112 | #endif /* _MSDOSFS_BOOTSECT_H_ */ |