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 | |