projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 15637ed4 RG |
1 | /* |
| 2 | * Written by Paul Popelka (paulp@uts.amdahl.com) | |
| 3 | * | |
| 4 | * You can do anything you want with this software, | |
| 5 | * just don't say you wrote it, | |
| 6 | * and don't remove this notice. | |
| 7 | * | |
| 8 | * This software is provided "as is". | |
| 9 | * | |
| 10 | * The author supplies this software to be publicly | |
| 11 | * redistributed on the understanding that the author | |
| 12 | * is not responsible for the correct functioning of | |
| 13 | * this software in any circumstances and is not liable | |
| 14 | * for any damages caused by this software. | |
| 15 | * | |
| 16 | * October 1992 | |
| 17 | * | |
| 78ed81a3 | 18 | * $Id$ |
| 15637ed4 RG |
19 | */ |
| 20 | ||
| 21 | /* | |
| 22 | * Format of a boot sector. This is the first sector | |
| 23 | * on a DOS floppy disk or the fist sector of a partition | |
| 24 | * on a hard disk. But, it is not the first sector of | |
| 25 | * a partitioned hard disk. | |
| 26 | */ | |
| 27 | struct bootsector33 { | |
| 28 | char bsJump[3]; /* jump instruction E9xxxx or EBxx90 */ | |
| 29 | char bsOemName[8]; /* OEM name and version */ | |
| 30 | char bsBPB[19]; /* BIOS parameter block */ | |
| 31 | char bsDriveNumber; /* drive number (0x80) */ | |
| 32 | char bsBootCode[474]; /* pad so structure is 512 bytes long */ | |
| 33 | u_short bsBootSectSig; | |
| 34 | #define BOOTSIG 0xaa55 | |
| 35 | }; | |
| 36 | ||
| 37 | struct bootsector50 { | |
| 38 | char bsJump[3]; /* jump instruction E9xxxx or EBxx90 */ | |
| 39 | char bsOemName[8]; /* OEM name and version */ | |
| 40 | char bsBPB[25]; /* BIOS parameter block */ | |
| 41 | char bsDriveNumber; /* drive number (0x80) */ | |
| 42 | char bsReserved1; /* reserved */ | |
| 43 | char bsBootSignature; /* extended boot signature (0x29) */ | |
| 44 | #define EXBOOTSIG 0x29 | |
| 45 | char bsVolumeID[4]; /* volume ID number */ | |
| 46 | char bsVolumeLabel[11]; /* volume label */ | |
| 47 | char bsFileSysType[8]; /* file system type (FAT12 or FAT16) */ | |
| 48 | char bsBootCode[448]; /* pad so structure is 512 bytes long */ | |
| 49 | u_short bsBootSectSig; | |
| 50 | #define BOOTSIG 0xaa55 | |
| 51 | }; | |
| 52 | ||
| 53 | union bootsector { | |
| 54 | struct bootsector33 bs33; | |
| 55 | struct bootsector50 bs50; | |
| 56 | }; | |
| 57 | ||
| 58 | /* | |
| 59 | * Shorthand for fields in the bpb. | |
| 60 | */ | |
| 61 | #define bsBytesPerSec bsBPB.bpbBytesPerSec | |
| 62 | #define bsSectPerClust bsBPB.bpbSectPerClust | |
| 63 | #define bsResSectors bsBPB.bpbResSectors | |
| 64 | #define bsFATS bsBPB.bpbFATS | |
| 65 | #define bsRootDirEnts bsBPB.bpbRootDirEnts | |
| 66 | #define bsSectors bsBPB.bpbSectors | |
| 67 | #define bsMedia bsBPB.bpbMedia | |
| 68 | #define bsFATsecs bsBPB.bpbFATsecs | |
| 69 | #define bsSectPerTrack bsBPB.bpbSectPerTrack | |
| 70 | #define bsHeads bsBPB.bpbHeads | |
| 71 | #define bsHiddenSecs bsBPB.bpbHiddenSecs | |
| 72 | #define bsHugeSectors bsBPB.bpbHugeSectors |