1 /* $FreeBSD: src/sys/msdosfs/bootsect.h,v 1.7 1999/08/28 00:48:06 peter Exp $ */ 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 #ifndef _VFS_MSDOSFS_BOOTSECT_H_ 21 #define _VFS_MSDOSFS_BOOTSECT_H_ 22 23 /* 24 * Format of a boot sector. This is the first sector on a DOS floppy disk 25 * or the fist sector of a partition on a hard disk. But, it is not the 26 * first sector of a partitioned hard disk. 27 */ 28 struct bootsector33 { 29 u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ 30 int8_t bsOemName[8]; /* OEM name and version */ 31 int8_t bsBPB[19]; /* BIOS parameter block */ 32 int8_t bsDriveNumber; /* drive number (0x80) */ 33 int8_t bsBootCode[479]; /* pad so struct is 512b */ 34 u_int8_t bsBootSectSig0; 35 u_int8_t bsBootSectSig1; 36 #define BOOTSIG0 0x55 37 #define BOOTSIG1 0xaa 38 }; 39 40 struct extboot { 41 int8_t exDriveNumber; /* drive number (0x80) */ 42 int8_t exReserved1; /* reserved */ 43 int8_t exBootSignature; /* ext. boot signature (0x29) */ 44 #define EXBOOTSIG 0x29 45 #define EXBOOTSIG2 0x28 46 int8_t exVolumeID[4]; /* volume ID number */ 47 int8_t exVolumeLabel[11]; /* volume label */ 48 int8_t exFileSysType[8]; /* fs type (FAT12 or FAT16) */ 49 }; 50 51 struct bootsector50 { 52 u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ 53 int8_t bsOemName[8]; /* OEM name and version */ 54 int8_t bsBPB[25]; /* BIOS parameter block */ 55 int8_t bsExt[26]; /* Bootsector Extension */ 56 int8_t bsBootCode[448]; /* pad so structure is 512b */ 57 u_int8_t bsBootSectSig0; 58 u_int8_t bsBootSectSig1; 59 #define BOOTSIG0 0x55 60 #define BOOTSIG1 0xaa 61 }; 62 63 struct bootsector710 { 64 u_int8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ 65 int8_t bsOEMName[8]; /* OEM name and version */ 66 int8_t bsPBP[53]; /* BIOS parameter block */ 67 int8_t bsExt[26]; /* Bootsector Extension */ 68 int8_t bsBootCode[418]; /* pad so structure is 512b */ 69 u_int8_t bsBootSectSig2; /* 2 & 3 are only defined for FAT32? */ 70 u_int8_t bsBootSectSig3; 71 u_int8_t bsBootSectSig0; 72 u_int8_t bsBootSectSig1; 73 #define BOOTSIG0 0x55 74 #define BOOTSIG1 0xaa 75 #define BOOTSIG2 0 76 #define BOOTSIG3 0 77 }; 78 #ifdef atari 79 /* 80 * The boot sector on a gemdos fs is a little bit different from the msdos fs 81 * format. Currently there is no need to declare a separate structure, the 82 * bootsector33 struct will do. 83 */ 84 #if 0 85 struct bootsec_atari { 86 u_int8_t bsBranch[2]; /* branch inst if auto-boot */ 87 int8_t bsFiller[6]; /* anything or nothing */ 88 int8_t bsSerial[3]; /* serial no. for mediachange */ 89 int8_t bsBPB[19]; /* BIOS parameter block */ 90 int8_t bsBootCode[482]; /* pad so struct is 512b */ 91 }; 92 #endif 93 #endif /* atari */ 94 95 union bootsector { 96 struct bootsector33 bs33; 97 struct bootsector50 bs50; 98 struct bootsector710 bs710; 99 }; 100 101 #if 0 102 /* 103 * Shorthand for fields in the bpb. 104 */ 105 #define bsBytesPerSec bsBPB.bpbBytesPerSec 106 #define bsSectPerClust bsBPB.bpbSectPerClust 107 #define bsResSectors bsBPB.bpbResSectors 108 #define bsFATS bsBPB.bpbFATS 109 #define bsRootDirEnts bsBPB.bpbRootDirEnts 110 #define bsSectors bsBPB.bpbSectors 111 #define bsMedia bsBPB.bpbMedia 112 #define bsFATsecs bsBPB.bpbFATsecs 113 #define bsSectPerTrack bsBPB.bpbSectPerTrack 114 #define bsHeads bsBPB.bpbHeads 115 #define bsHiddenSecs bsBPB.bpbHiddenSecs 116 #define bsHugeSectors bsBPB.bpbHugeSectors 117 #endif 118 119 #endif /* !_VFS_MSDOSFS_BOOTSECT_H_ */ 120