1 /* $FreeBSD$ */ 2 /* $NetBSD: bootsect.h,v 1.9 1997/11/17 15:36:17 ws Exp $ */ 3 4 /*- 5 * Written by Paul Popelka (paulp@uts.amdahl.com) 6 * 7 * You can do anything you want with this software, just don't say you wrote 8 * it, and don't remove this notice. 9 * 10 * This software is provided "as is". 11 * 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. 16 * 17 * October 1992 18 */ 19 #ifndef _FS_MSDOSFS_BOOTSECT_H_ 20 #define _FS_MSDOSFS_BOOTSECT_H_ 21 22 /* 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. 26 */ 27 struct bootsector33 { 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; 35 #define BOOTSIG0 0x55 36 #define BOOTSIG1 0xaa 37 }; 38 39 struct extboot { 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 #define EXBOOTSIG2 0x28 45 int8_t exVolumeID[4]; /* volume ID number */ 46 int8_t exVolumeLabel[11]; /* volume label */ 47 int8_t exFileSysType[8]; /* fs type (FAT12 or FAT16) */ 48 }; 49 50 struct bootsector50 { 51 uint8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ 52 int8_t bsOemName[8]; /* OEM name and version */ 53 int8_t bsBPB[25]; /* BIOS parameter block */ 54 int8_t bsExt[26]; /* Bootsector Extension */ 55 int8_t bsBootCode[448]; /* pad so structure is 512b */ 56 uint8_t bsBootSectSig0; 57 uint8_t bsBootSectSig1; 58 #define BOOTSIG0 0x55 59 #define BOOTSIG1 0xaa 60 }; 61 62 struct bootsector710 { 63 uint8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ 64 int8_t bsOEMName[8]; /* OEM name and version */ 65 int8_t bsBPB[53]; /* BIOS parameter block */ 66 int8_t bsExt[26]; /* Bootsector Extension */ 67 int8_t bsBootCode[420]; /* pad so structure is 512b */ 68 uint8_t bsBootSectSig0; 69 uint8_t bsBootSectSig1; 70 #define BOOTSIG0 0x55 71 #define BOOTSIG1 0xaa 72 }; 73 74 union bootsector { 75 struct bootsector33 bs33; 76 struct bootsector50 bs50; 77 struct bootsector710 bs710; 78 }; 79 80 #if 0 81 /* 82 * Shorthand for fields in the bpb. 83 */ 84 #define bsBytesPerSec bsBPB.bpbBytesPerSec 85 #define bsSectPerClust bsBPB.bpbSectPerClust 86 #define bsResSectors bsBPB.bpbResSectors 87 #define bsFATS bsBPB.bpbFATS 88 #define bsRootDirEnts bsBPB.bpbRootDirEnts 89 #define bsSectors bsBPB.bpbSectors 90 #define bsMedia bsBPB.bpbMedia 91 #define bsFATsecs bsBPB.bpbFATsecs 92 #define bsSectPerTrack bsBPB.bpbSectPerTrack 93 #define bsHeads bsBPB.bpbHeads 94 #define bsHiddenSecs bsBPB.bpbHiddenSecs 95 #define bsHugeSectors bsBPB.bpbHugeSectors 96 #endif 97 98 #endif /* !_FS_MSDOSFS_BOOTSECT_H_ */ 99