first commit
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Elaina Claus
86
include/fat32/bpb.inc
Executable file
86
include/fat32/bpb.inc
Executable file
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; Copyright (C) 2020 Bradley Claus
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <https://www.gnu.org/licenses/>.
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; BPB Information
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; Off. Hex Off. Size Description
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; 0 0x00 3 The first three bytes EB 3C 90 disassemble to JMP SHORT 3C NOP. (The 3C value may be different.)
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; 3 0x03 8 OEM identifier.
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; 11 0x0B 2 The number of Bytes per sector (remember, all numbers are in the little-endian format).
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; 13 0x0D 1 Number of sectors per cluster.
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; 14 0x0E 2 Number of reserved sectors. The boot record sectors are included in this value.
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; 16 0x10 1 Number of File Allocation Tables (FAT's) on the storage media. Often this value is 2.
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; 17 0x11 2 Number of directory entries (must be set so that the root directory occupies entire sectors).
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; 19 0x13 2 The total sectors in the logical volume.
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; If this value is 0, it means there are more than 65535 sectors in the volume,
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; and the actual count is stored in the Large Sector Count entry at 0x20.
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;
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; 21 0x15 1 This Byte indicates the media descriptor type.
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; 22 0x16 2 Number of sectors per FAT. FAT12/FAT16 only.
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; 24 0x18 2 Number of sectors per track.
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; 26 0x1A 2 Number of heads or sides on the storage media.
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; 28 0x1C 4 Number of hidden sectors. (i.e. the LBA of the beginning of the partition.)
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; 32 0x20 4 Large sector count. This field is set if there are more than 65535 sectors in the volume,
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; resulting in a value which does not fit in the Number of Sectors entry at 0x13.
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;-- BPB (BIOS Parameter Block)
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%define bsOemName bx+0x03
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%define bsBytesPerSect bx+0x0B
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%define bsSecsPerClust bx+0x0D
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%define bsResSectors bx+0x0E
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%define bsFATs bx+0x10
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%define bsRootDirEnts bx+0x11
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%define bsSectors bx+0x13
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%define bsMedia bx+0x15
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%define bsSectPerFAT1216 bx+0x16
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%define bsSectPerTrack bx+0x18
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%define bsHeads bx+0x1A
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%define bsHidden bx+0x1C
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%define bsSectorHuge bx+0x20
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;-- End BPB
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; EBPB Information (FAT32)
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; Off. Hex Off. Size Description
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; 36 0x024 4 Sectors per FAT. The size of the FAT in sectors.
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; 40 0x028 2 Flags.
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; 42 0x02A 2 FAT version number. The high byte is the major version and the low byte is the minor version. FAT drivers should respect this field.
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; 44 0x02C 4 The cluster number of the root directory. Often this field is set to 2.
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; 48 0x030 2 The sector number of the FSInfo structure.
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; 50 0x032 2 The sector number of the backup boot sector.
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; 52 0x034 12 Reserved. When the volume is formated these bytes should be zero.
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; 64 0x040 1 Drive number. The values here are identical to the values returned by the BIOS interrupt 0x13. 0x00 for a floppy disk and 0x80 for hard disks.
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; 65 0x041 1 Flags in Windows NT. Reserved otherwise.
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; 66 0x042 1 Signature (must be 0x28 or 0x29).
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; 67 0x043 4 Volume ID 'Serial' number. Used for tracking volumes between computers. You can ignore this if you want.
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; 71 0x047 11 Volume label string. This field is padded with spaces.
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; 82 0x052 8 System identifier string. Always "FAT32 ". The spec says never to trust the contents of this string for any use.
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; 90 0x05A 420 Boot code.
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; 510 0x1FE 2 Bootable partition signature 0xAA55.
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;-- EBPB (Extended BIOS Parameter Block)
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%define bsSectorsPerFAT bx+0x24
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%define bsFlags bx+0x28
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%define bsFATVersion bx+0x2A
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%define bsRootDirCluster bx+0x2C
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%define bsFSInfoCluster bx+0x30
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%define bsBackupBootSector bx+0x32
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%define bsReserved1 bx+0x34
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%define bsDriveNumber bx+0x40
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%define bsNTFlags bx+0x41
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%define bsFATSignature bx+0x42
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%define bsVolumeSerial bx+0x43
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%define bsVolumeLabel bx+0x47
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%define bsSystemIdent bx+0x52
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;-- End EBPB
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