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 $ */ 4 5 /* 6 * Written by Paul Popelka (paulp@uts.amdahl.com) 7 * 8 * You can do anything you want with this software, just don't say you wrote 9 * it, and don't remove this notice. 10 * 11 * This software is provided "as is". 12 * 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. 17 * 18 * October 1992 19 */ 20 21 /* 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. 25 */ 26 struct bootsector33 { 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; 34 #define BOOTSIG0 0x55 35 #define BOOTSIG1 0xaa 36 }; 37 38 struct extboot { 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 int8_t exVolumeID[4]; /* volume ID number */ 44 int8_t exVolumeLabel[11]; /* volume label */ 45 int8_t exFileSysType[8]; /* fs type (FAT12 or FAT16) */ 46 }; 47 48 struct bootsector50 { 49 u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ 50 int8_t bsOemName[8]; /* OEM name and version */ 51 int8_t bsBPB[25]; /* BIOS parameter block */ 52 int8_t bsExt[26]; /* Bootsector Extension */ 53 int8_t bsBootCode[448]; /* pad so structure is 512b */ 54 u_int8_t bsBootSectSig0; 55 u_int8_t bsBootSectSig1; 56 #define BOOTSIG0 0x55 57 #define BOOTSIG1 0xaa 58 }; 59 60 struct bootsector710 { 61 u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ 62 int8_t bsOEMName[8]; /* OEM name and version */ 63 int8_t bsPBP[53]; /* BIOS parameter block */ 64 int8_t bsExt[26]; /* Bootsector Extension */ 65 int8_t bsBootCode[418]; /* pad so structure is 512b */ 66 u_int8_t bsBootSectSig2; /* 2 & 3 are only defined for FAT32? */ 67 u_int8_t bsBootSectSig3; 68 u_int8_t bsBootSectSig0; 69 u_int8_t bsBootSectSig1; 70 #define BOOTSIG0 0x55 71 #define BOOTSIG1 0xaa 72 #define BOOTSIG2 0 73 #define BOOTSIG3 0 74 }; 75 #ifdef atari 76 /* 77 * The boot sector on a gemdos fs is a little bit different from the msdos fs 78 * format. Currently there is no need to declare a separate structure, the 79 * bootsector33 struct will do. 80 */ 81 #if 0 82 struct bootsec_atari { 83 u_int8_t bsBranch[2]; /* branch inst if auto-boot */ 84 int8_t bsFiller[6]; /* anything or nothing */ 85 int8_t bsSerial[3]; /* serial no. for mediachange */ 86 int8_t bsBPB[19]; /* BIOS parameter block */ 87 int8_t bsBootCode[482]; /* pad so struct is 512b */ 88 }; 89 #endif 90 #endif /* atari */ 91 92 union bootsector { 93 struct bootsector33 bs33; 94 struct bootsector50 bs50; 95 struct bootsector710 bs710; 96 }; 97 98 #if 0 99 /* 100 * Shorthand for fields in the bpb. 101 */ 102 #define bsBytesPerSec bsBPB.bpbBytesPerSec 103 #define bsSectPerClust bsBPB.bpbSectPerClust 104 #define bsResSectors bsBPB.bpbResSectors 105 #define bsFATS bsBPB.bpbFATS 106 #define bsRootDirEnts bsBPB.bpbRootDirEnts 107 #define bsSectors bsBPB.bpbSectors 108 #define bsMedia bsBPB.bpbMedia 109 #define bsFATsecs bsBPB.bpbFATsecs 110 #define bsSectPerTrack bsBPB.bpbSectPerTrack 111 #define bsHeads bsBPB.bpbHeads 112 #define bsHiddenSecs bsBPB.bpbHiddenSecs 113 #define bsHugeSectors bsBPB.bpbHugeSectors 114 #endif 115