327 lines
15 KiB
C++
327 lines
15 KiB
C++
/*++
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Copyright (c) 1993 Microsoft Corporation
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Module Name:
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bpb.hxx
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Abstract:
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This module contains the declarations for packed and
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unpacked Bios Parameter Block
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Author:
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Bill McJohn [BillMc] 24-September-1993
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Revision History:
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--*/
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#if !defined( _IFSUTIL_BPB_DEFN_ )
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#define _IFSUTIL_BPB_DEFN_
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#define cOEM 8
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#define cLABEL 11
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#define cSYSID 8
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typedef struct _PACKED_BIOS_PARAMETER_BLOCK {
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UCHAR BytesPerSector[2]; // offset = 0x000
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UCHAR SectorsPerCluster[1]; // offset = 0x002
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UCHAR ReservedSectors[2]; // offset = 0x003
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UCHAR Fats[1]; // offset = 0x005
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UCHAR RootEntries[2]; // offset = 0x006
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UCHAR Sectors[2]; // offset = 0x008
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UCHAR Media[1]; // offset = 0x00A
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UCHAR SectorsPerFat[2]; // offset = 0x00B
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UCHAR SectorsPerTrack[2]; // offset = 0x00D
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UCHAR Heads[2]; // offset = 0x00F
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UCHAR HiddenSectors[4]; // offset = 0x011
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UCHAR LargeSectors[4]; // offset = 0x015
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UCHAR BigSectorsPerFat[4]; // offset = 0x019 25
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UCHAR ExtFlags[2]; // offset = 0x01D 29
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UCHAR FS_Version[2]; // offset = 0x01F 31
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UCHAR RootDirStrtClus[4]; // offset = 0x021 33
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UCHAR FSInfoSec[2]; // offset = 0x025 37
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UCHAR BkUpBootSec[2]; // offset = 0x027 39
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UCHAR Reserved[12]; // offset = 0x029 41
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} PACKED_BIOS_PARAMETER_BLOCK; // sizeof = 0x035 53
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typedef PACKED_BIOS_PARAMETER_BLOCK *PPACKED_BIOS_PARAMETER_BLOCK;
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// DEFINE THIS UNCHANGED PBPB for use on NTFS drive PBootSector
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typedef struct _OLD_PACKED_BIOS_PARAMETER_BLOCK {
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UCHAR BytesPerSector[2]; // offset = 0x000
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UCHAR SectorsPerCluster[1]; // offset = 0x002
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UCHAR ReservedSectors[2]; // offset = 0x003
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UCHAR Fats[1]; // offset = 0x005
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UCHAR RootEntries[2]; // offset = 0x006
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UCHAR Sectors[2]; // offset = 0x008
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UCHAR Media[1]; // offset = 0x00A
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UCHAR SectorsPerFat[2]; // offset = 0x00B
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UCHAR SectorsPerTrack[2]; // offset = 0x00D
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UCHAR Heads[2]; // offset = 0x00F
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UCHAR HiddenSectors[4]; // offset = 0x011
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UCHAR LargeSectors[4]; // offset = 0x015
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} OLD_PACKED_BIOS_PARAMETER_BLOCK; // sizeof = 0x019
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typedef struct BIOS_PARAMETER_BLOCK {
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USHORT BytesPerSector;
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UCHAR SectorsPerCluster;
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USHORT ReservedSectors;
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UCHAR Fats;
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USHORT RootEntries;
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USHORT Sectors;
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UCHAR Media;
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USHORT SectorsPerFat;
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USHORT SectorsPerTrack;
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USHORT Heads;
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ULONG HiddenSectors;
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ULONG LargeSectors;
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ULONG BigSectorsPerFat;
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USHORT ExtFlags;
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USHORT FS_Version;
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ULONG RootDirStrtClus;
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USHORT FSInfoSec;
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USHORT BkUpBootSec;
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} BIOS_PARAMETER_BLOCK;
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typedef BIOS_PARAMETER_BLOCK *PBIOS_PARAMETER_BLOCK;
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#if !defined( _UCHAR_DEFINED_ )
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#define _UCHAR_DEFINED_
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//
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// The following types and macros are used to help unpack the packed and
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// misaligned fields found in the Bios parameter block
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//
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typedef union _UCHAR1 {
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UCHAR Uchar[1];
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UCHAR ForceAlignment;
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} UCHAR1, *PUCHAR1;
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typedef union _UCHAR2 {
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UCHAR Uchar[2];
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USHORT ForceAlignment;
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} UCHAR2, *PUCHAR2;
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typedef union _UCHAR4 {
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UCHAR Uchar[4];
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ULONG ForceAlignment;
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} UCHAR4, *PUCHAR4;
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#define CopyUchar1(Dst,Src) { \
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*((UCHAR1 *)(Dst)) = *((UNALIGNED UCHAR1 *)(Src)); \
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}
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#define CopyUchar2(Dst,Src) { \
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*((UCHAR2 *)(Dst)) = *((UNALIGNED UCHAR2 *)(Src)); \
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}
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#define CopyU2char(Dst,Src) { \
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*((UNALIGNED UCHAR2 *)(Dst)) = *((UCHAR2 *)(Src)); \
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}
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#define CopyUchar4(Dst,Src) { \
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*((UCHAR4 *)(Dst)) = *((UNALIGNED UCHAR4 *)((ULONG_PTR)(Src))); \
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}
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#define CopyU4char(Dst, Src) { \
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*((UNALIGNED UCHAR4 *)(Dst)) = *((UCHAR4 *)(Src)); \
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}
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#endif // _UCHAR_DEFINED_
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//
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// This macro takes a Packed BPB and fills in its Unpacked equivalent
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//
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#define UnpackBiosExt32(Bios,Pbios) { \
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CopyUchar2(&((Bios)->BytesPerSector), (Pbios)->BytesPerSector ); \
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CopyUchar1(&((Bios)->SectorsPerCluster), (Pbios)->SectorsPerCluster); \
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CopyUchar2(&((Bios)->ReservedSectors), (Pbios)->ReservedSectors ); \
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CopyUchar1(&((Bios)->Fats), (Pbios)->Fats ); \
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CopyUchar2(&((Bios)->RootEntries), (Pbios)->RootEntries ); \
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CopyUchar2(&((Bios)->Sectors), (Pbios)->Sectors ); \
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CopyUchar1(&((Bios)->Media), (Pbios)->Media ); \
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CopyUchar2(&((Bios)->SectorsPerFat), (Pbios)->SectorsPerFat ); \
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CopyUchar2(&((Bios)->SectorsPerTrack), (Pbios)->SectorsPerTrack ); \
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CopyUchar2(&((Bios)->Heads), (Pbios)->Heads ); \
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CopyUchar4(&((Bios)->HiddenSectors), (Pbios)->HiddenSectors ); \
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CopyUchar4(&((Bios)->LargeSectors), (Pbios)->LargeSectors ); \
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CopyUchar4(&((Bios)->BigSectorsPerFat), (Pbios)->BigSectorsPerFat ); \
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CopyUchar2(&((Bios)->ExtFlags), (Pbios)->ExtFlags ); \
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CopyUchar2(&((Bios)->FS_Version), (Pbios)->FS_Version ); \
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CopyUchar4(&((Bios)->RootDirStrtClus), (Pbios)->RootDirStrtClus ); \
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CopyUchar2(&((Bios)->FSInfoSec), (Pbios)->FSInfoSec ); \
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CopyUchar2(&((Bios)->BkUpBootSec), (Pbios)->BkUpBootSec ); \
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}
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#define UnpackBios(Bios,Pbios) { \
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CopyUchar2(&((Bios)->BytesPerSector), (Pbios)->BytesPerSector ); \
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CopyUchar1(&((Bios)->SectorsPerCluster), (Pbios)->SectorsPerCluster); \
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CopyUchar2(&((Bios)->ReservedSectors), (Pbios)->ReservedSectors ); \
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CopyUchar1(&((Bios)->Fats), (Pbios)->Fats ); \
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CopyUchar2(&((Bios)->RootEntries), (Pbios)->RootEntries ); \
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CopyUchar2(&((Bios)->Sectors), (Pbios)->Sectors ); \
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CopyUchar1(&((Bios)->Media), (Pbios)->Media ); \
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CopyUchar2(&((Bios)->SectorsPerFat), (Pbios)->SectorsPerFat ); \
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CopyUchar2(&((Bios)->SectorsPerTrack), (Pbios)->SectorsPerTrack ); \
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CopyUchar2(&((Bios)->Heads), (Pbios)->Heads ); \
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CopyUchar4(&((Bios)->HiddenSectors), (Pbios)->HiddenSectors ); \
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CopyUchar4(&((Bios)->LargeSectors), (Pbios)->LargeSectors ); \
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}
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//
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// This macro takes an Unpacked BPB and fills in its Packed equivalent
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//
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#define PackBios32(Bios,Pbios) { \
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CopyU2char((Pbios)->BytesPerSector, &((Bios)->BytesPerSector) ); \
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CopyUchar1((Pbios)->SectorsPerCluster, &((Bios)->SectorsPerCluster)); \
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CopyU2char((Pbios)->ReservedSectors, &((Bios)->ReservedSectors) ); \
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CopyUchar1((Pbios)->Fats, &((Bios)->Fats) ); \
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CopyU2char((Pbios)->RootEntries, &((Bios)->RootEntries) ); \
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CopyU2char((Pbios)->Sectors, &((Bios)->Sectors) ); \
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CopyUchar1((Pbios)->Media, &((Bios)->Media) ); \
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CopyU2char((Pbios)->SectorsPerFat, &((Bios)->SectorsPerFat) ); \
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CopyU2char((Pbios)->SectorsPerTrack, &((Bios)->SectorsPerTrack) ); \
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CopyU2char((Pbios)->Heads, &((Bios)->Heads) ); \
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CopyU4char((Pbios)->HiddenSectors, &((Bios)->HiddenSectors) ); \
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CopyU4char((Pbios)->LargeSectors, &((Bios)->LargeSectors) ); \
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CopyU4char((Pbios)->BigSectorsPerFat, &((Bios)->BigSectorsPerFat) ); \
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CopyU2char((Pbios)->ExtFlags, &((Bios)->ExtFlags) ); \
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CopyU2char((Pbios)->FS_Version, &((Bios)->FS_Version) ); \
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CopyU4char((Pbios)->RootDirStrtClus, &((Bios)->RootDirStrtClus) ); \
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CopyU2char((Pbios)->FSInfoSec, &((Bios)->FSInfoSec) ); \
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CopyU2char((Pbios)->BkUpBootSec, &((Bios)->BkUpBootSec) ); \
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}
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#define PackBios(Bios,Pbios) { \
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CopyU2char((Pbios)->BytesPerSector, &((Bios)->BytesPerSector) ); \
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CopyUchar1((Pbios)->SectorsPerCluster, &((Bios)->SectorsPerCluster)); \
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CopyU2char((Pbios)->ReservedSectors, &((Bios)->ReservedSectors) ); \
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CopyUchar1((Pbios)->Fats, &((Bios)->Fats) ); \
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CopyU2char((Pbios)->RootEntries, &((Bios)->RootEntries) ); \
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CopyU2char((Pbios)->Sectors, &((Bios)->Sectors) ); \
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CopyUchar1((Pbios)->Media, &((Bios)->Media) ); \
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CopyU2char((Pbios)->SectorsPerFat, &((Bios)->SectorsPerFat) ); \
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CopyU2char((Pbios)->SectorsPerTrack, &((Bios)->SectorsPerTrack) ); \
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CopyU2char((Pbios)->Heads, &((Bios)->Heads) ); \
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CopyU4char((Pbios)->HiddenSectors, &((Bios)->HiddenSectors) ); \
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CopyU4char((Pbios)->LargeSectors, &((Bios)->LargeSectors) ); \
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}
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//
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// And now, an extended BPB:
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//
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typedef struct _PACKED_EXTENDED_BIOS_PARAMETER_BLOCK {
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UCHAR IntelNearJumpCommand[1];
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UCHAR BootStrapJumpOffset[2];
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UCHAR OemData[cOEM];
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PACKED_BIOS_PARAMETER_BLOCK Bpb;
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UCHAR PhysicalDrive[1]; // 0 = removable, 80h = fixed
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UCHAR CurrentHead[1]; // used for dirty partition info
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UCHAR Signature[1]; // boot signature
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UCHAR SerialNumber[4]; // volume serial number
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UCHAR Label[cLABEL]; // volume label, padded with spaces
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UCHAR SystemIdText[cSYSID]; // system ID, (e.g. FAT or HPFS)
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UCHAR StartBootCode; // first byte of boot code
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} PACKED_EXTENDED_BIOS_PARAMETER_BLOCK, *PPACKED_EXTENDED_BIOS_PARAMETER_BLOCK;
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typedef struct _OLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK {
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UCHAR IntelNearJumpCommand[1];
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UCHAR BootStrapJumpOffset[2];
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UCHAR OemData[cOEM];
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OLD_PACKED_BIOS_PARAMETER_BLOCK Bpb;
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UCHAR PhysicalDrive[1]; // 0 = removable, 80h = fixed
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UCHAR CurrentHead[1]; // used for dirty partition info
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UCHAR Signature[1]; // boot signature
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UCHAR SerialNumber[4]; // volume serial number
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UCHAR Label[cLABEL]; // volume label, padded with spaces
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UCHAR SystemIdText[cSYSID]; // system ID, (e.g. FAT or HPFS)
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UCHAR StartBootCode; // first byte of boot code
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} OLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK, *POLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK;
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typedef struct _EXTENDED_BIOS_PARAMETER_BLOCK {
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UCHAR IntelNearJumpCommand;
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USHORT BootStrapJumpOffset;
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UCHAR OemData[cOEM];
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BIOS_PARAMETER_BLOCK Bpb;
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UCHAR PhysicalDrive;
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UCHAR CurrentHead;
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UCHAR Signature;
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ULONG SerialNumber;
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UCHAR Label[11];
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UCHAR SystemIdText[8];
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} EXTENDED_BIOS_PARAMETER_BLOCK, *PEXTENDED_BIOS_PARAMETER_BLOCK;
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//
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// This macro unpacks a Packed Extended BPB.
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//
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// The UnPACK with SectorsPerFat gets FAT 16 boot sector elements properly loaded for ChkDsk
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#define UnpackExtendedBios( Bios, Pbios ) { \
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CopyUchar1( &((Bios)->IntelNearJumpCommand), (Pbios)->IntelNearJumpCommand ); \
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CopyUchar2( &((Bios)->BootStrapJumpOffset), (Pbios)->BootStrapJumpOffset ); \
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memcpy( (Bios)->OemData, (Pbios)->OemData, cOEM ); \
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UnpackBiosExt32( &((Bios)->Bpb), &((Pbios)->Bpb)); \
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if ((Bios)->Bpb.SectorsPerFat) { \
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CopyUchar1( &((Bios)->PhysicalDrive), ((POLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK)(Pbios))->PhysicalDrive ); \
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CopyUchar1( &((Bios)->CurrentHead), ((POLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK)(Pbios))->CurrentHead ); \
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CopyUchar1( &((Bios)->Signature), ((POLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK)(Pbios))->Signature ); \
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CopyUchar4( &((Bios)->SerialNumber), ((POLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK)(Pbios))->SerialNumber ); \
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memcpy( (Bios)->Label, ((POLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK)(Pbios))->Label, cLABEL ); \
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memcpy( (Bios)->SystemIdText, ((POLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK)(Pbios))->SystemIdText, cSYSID ); \
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} else { \
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CopyUchar1( &((Bios)->PhysicalDrive), (Pbios)->PhysicalDrive ); \
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CopyUchar1( &((Bios)->CurrentHead), (Pbios)->CurrentHead ); \
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CopyUchar1( &((Bios)->Signature), (Pbios)->Signature ); \
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CopyUchar4( &((Bios)->SerialNumber), (Pbios)->SerialNumber ); \
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memcpy( (Bios)->Label, (Pbios)->Label, cLABEL ); \
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memcpy( (Bios)->SystemIdText, (Pbios)->SystemIdText, cSYSID ); \
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} \
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}
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//
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// This macro packs a Packed Extended BPB.
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//
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// The PACK with SectorsPerFat keeps FAT 16 boot sector unchanged on FORMAT
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#define PackExtendedBios( Bios, Pbios ) { \
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if ((Bios)->Bpb.SectorsPerFat) { \
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PackBios( &((Bios)->Bpb), &((Pbios)->Bpb)); \
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CopyUchar1( ((POLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK)(Pbios))->PhysicalDrive, &((Bios)->PhysicalDrive )); \
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CopyUchar1( ((POLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK)(Pbios))->CurrentHead, &((Bios)->CurrentHead )); \
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CopyUchar1( ((POLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK)(Pbios))->Signature, &((Bios)->Signature)); \
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CopyU4char( ((POLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK)(Pbios))->SerialNumber, &((Bios)->SerialNumber )); \
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memcpy( ((POLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK)(Pbios))->Label, (Bios)->Label, cLABEL ); \
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memcpy( ((POLD_PACKED_EXTENDED_BIOS_PARAMETER_BLOCK)(Pbios))->SystemIdText, (Bios)->SystemIdText, cSYSID ); \
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} else { \
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PackBios32( &((Bios)->Bpb), &((Pbios)->Bpb)); \
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CopyUchar1( (Pbios)->PhysicalDrive, &((Bios)->PhysicalDrive )); \
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CopyUchar1( (Pbios)->CurrentHead, &((Bios)->CurrentHead )); \
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CopyUchar1( (Pbios)->Signature, &((Bios)->Signature)); \
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CopyU4char( (Pbios)->SerialNumber, &((Bios)->SerialNumber )); \
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memcpy( (Pbios)->Label, (Bios)->Label, cLABEL ); \
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memcpy( (Pbios)->SystemIdText, (Bios)->SystemIdText, cSYSID ); \
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} \
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CopyUchar1( (Pbios)->IntelNearJumpCommand, &((Bios)->IntelNearJumpCommand) ); \
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CopyU2char( (Pbios)->BootStrapJumpOffset, &((Bios)->BootStrapJumpOffset) ); \
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memcpy( (Pbios)->OemData, (Bios)->OemData, cOEM ); \
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}
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#endif
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