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 20 /* 21 * Format of a boot sector. This is the first sector on a DOS floppy disk 22 * or the fist sector of a partition on a hard disk. But, it is not the 23 * first sector of a partitioned hard disk. 24 */ 25 struct bootsector33 { 26 u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ 27 int8_t bsOemName[8]; /* OEM name and version */ 28 int8_t bsBPB[19]; /* BIOS parameter block */ 29 int8_t bsDriveNumber; /* drive number (0x80) */ 30 int8_t bsBootCode[479]; /* pad so struct is 512b */ 31 u_int8_t bsBootSectSig0; 32 u_int8_t bsBootSectSig1; 33 #define BOOTSIG0 0x55 34 #define BOOTSIG1 0xaa 35 }; 36 37 struct extboot { 38 int8_t exDriveNumber; /* drive number (0x80) */ 39 int8_t exReserved1; /* reserved */ 40 int8_t exBootSignature; /* ext. boot signature (0x29) */ 41 #define EXBOOTSIG 0x29 42 int8_t exVolumeID[4]; /* volume ID number */ 43 int8_t exVolumeLabel[11]; /* volume label */ 44 int8_t exFileSysType[8]; /* fs type (FAT12 or FAT16) */ 45 }; 46 47 struct bootsector50 { 48 u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ 49 int8_t bsOemName[8]; /* OEM name and version */ 50 int8_t bsBPB[25]; /* BIOS parameter block */ 51 int8_t bsExt[26]; /* Bootsector Extension */ 52 int8_t bsBootCode[448]; /* pad so structure is 512b */ 53 u_int8_t bsBootSectSig0; 54 u_int8_t bsBootSectSig1; 55 #define BOOTSIG0 0x55 56 #define BOOTSIG1 0xaa 57 }; 58 59 struct bootsector710 { 60 u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ 61 int8_t bsOEMName[8]; /* OEM name and version */ 62 int8_t bsPBP[53]; /* BIOS parameter block */ 63 int8_t bsExt[26]; /* Bootsector Extension */ 64 int8_t bsBootCode[418]; /* pad so structure is 512b */ 65 u_int8_t bsBootSectSig2; /* 2 & 3 are only defined for FAT32? */ 66 u_int8_t bsBootSectSig3; 67 u_int8_t bsBootSectSig0; 68 u_int8_t bsBootSectSig1; 69 #define BOOTSIG0 0x55 70 #define BOOTSIG1 0xaa 71 #define BOOTSIG2 0 72 #define BOOTSIG3 0 73 }; 74 75 union bootsector { 76 struct bootsector33 bs33; 77 struct bootsector50 bs50; 78 struct bootsector710 bs710; 79 }; 80 81 #if 0 82 /* 83 * Shorthand for fields in the bpb. 84 */ 85 #define bsBytesPerSec bsBPB.bpbBytesPerSec 86 #define bsSectPerClust bsBPB.bpbSectPerClust 87 #define bsResSectors bsBPB.bpbResSectors 88 #define bsFATS bsBPB.bpbFATS 89 #define bsRootDirEnts bsBPB.bpbRootDirEnts 90 #define bsSectors bsBPB.bpbSectors 91 #define bsMedia bsBPB.bpbMedia 92 #define bsFATsecs bsBPB.bpbFATsecs 93 #define bsSectPerTrack bsBPB.bpbSectPerTrack 94 #define bsHeads bsBPB.bpbHeads 95 #define bsHiddenSecs bsBPB.bpbHiddenSecs 96 #define bsHugeSectors bsBPB.bpbHugeSectors 97 #endif 98