| 1 | /* $NetBSD: bootsect.h,v 1.6 2016/01/22 22:48:18 dholland Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Written by Paul Popelka (paulp@uts.amdahl.com) |
| 5 | * |
| 6 | * You can do anything you want with this software, just don't say you wrote |
| 7 | * it, and don't remove this notice. |
| 8 | * |
| 9 | * This software is provided "as is". |
| 10 | * |
| 11 | * The author supplies this software to be publicly redistributed on the |
| 12 | * understanding that the author is not responsible for the correct |
| 13 | * functioning of this software in any circumstances and is not liable for |
| 14 | * any damages caused by this software. |
| 15 | * |
| 16 | * October 1992 |
| 17 | */ |
| 18 | #ifndef _MSDOSFS_BOOTSECT_H_ |
| 19 | #define _MSDOSFS_BOOTSECT_H_ |
| 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 | uint8_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 | uint8_t bsBootSectSig0; |
| 33 | uint8_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 | uint8_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 | uint8_t bsBootSectSig0; |
| 55 | uint8_t bsBootSectSig1; |
| 56 | #define BOOTSIG0 0x55 |
| 57 | #define BOOTSIG1 0xaa |
| 58 | }; |
| 59 | |
| 60 | struct bootsector710 { |
| 61 | uint8_t bsJump[3]; /* jump inst E9xxxx or EBxx90 */ |
| 62 | int8_t bsOEMName[8]; /* OEM name and version */ |
| 63 | int8_t bsBPB[53]; /* BIOS parameter block */ |
| 64 | int8_t bsExt[26]; /* Bootsector Extension */ |
| 65 | int8_t bsBootCode[420]; /* pad so structure is 512b */ |
| 66 | uint8_t bsBootSectSig0; |
| 67 | uint8_t bsBootSectSig1; |
| 68 | #define BOOTSIG0 0x55 |
| 69 | #define BOOTSIG1 0xaa |
| 70 | }; |
| 71 | #ifdef atari |
| 72 | /* |
| 73 | * The boot sector on a GEMDOS FS is a little bit different from the MSDOS FS |
| 74 | * format. Currently there is no need to declare a separate structure, the |
| 75 | * bootsector33 struct will do. |
| 76 | */ |
| 77 | #if 0 |
| 78 | struct bootsec_atari { |
| 79 | uint8_t bsBranch[2]; /* branch inst if auto-boot */ |
| 80 | int8_t bsFiller[6]; /* anything or nothing */ |
| 81 | int8_t bsSerial[3]; /* serial no. for mediachange */ |
| 82 | int8_t bsBPB[19]; /* BIOS parameter block */ |
| 83 | int8_t bsBootCode[482]; /* pad so struct is 512b */ |
| 84 | }; |
| 85 | #endif |
| 86 | #endif /* atari */ |
| 87 | |
| 88 | union bootsector { |
| 89 | struct bootsector33 bs33; |
| 90 | struct bootsector50 bs50; |
| 91 | struct bootsector710 bs710; |
| 92 | }; |
| 93 | |
| 94 | #if 0 |
| 95 | /* |
| 96 | * Shorthand for fields in the bpb. |
| 97 | */ |
| 98 | #define bsBytesPerSec bsBPB.bpbBytesPerSec |
| 99 | #define bsSectPerClust bsBPB.bpbSectPerClust |
| 100 | #define bsResSectors bsBPB.bpbResSectors |
| 101 | #define bsFATS bsBPB.bpbFATS |
| 102 | #define bsRootDirEnts bsBPB.bpbRootDirEnts |
| 103 | #define bsSectors bsBPB.bpbSectors |
| 104 | #define bsMedia bsBPB.bpbMedia |
| 105 | #define bsFATsecs bsBPB.bpbFATsecs |
| 106 | #define bsSectPerTrack bsBPB.bpbSectPerTrack |
| 107 | #define bsHeads bsBPB.bpbHeads |
| 108 | #define bsHiddenSecs bsBPB.bpbHiddenSecs |
| 109 | #define bsHugeSectors bsBPB.bpbHugeSectors |
| 110 | #endif |
| 111 | |
| 112 | #endif /* _MSDOSFS_BOOTSECT_H_ */ |
| 113 | |