208 lines
8 KiB
C
208 lines
8 KiB
C
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/*++
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Copyright (c) 1993 Microsoft Corporation
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Module Name:
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bpb.h
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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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Adapted from utils\ifsutil\inc\bpb.hxx
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--*/
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#if !defined( _BPB_DEFN_ )
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#define _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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} PACKED_BIOS_PARAMETER_BLOCK; // sizeof = 0x019
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typedef PACKED_BIOS_PARAMETER_BLOCK *PPACKED_BIOS_PARAMETER_BLOCK;
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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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} 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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((PUCHAR1)(Dst))->Uchar[0] = ((PUCHAR1)(Src))->Uchar[0]; \
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}
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#define CopyUchar2(Dst,Src) { \
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((PUCHAR2)(Dst))->Uchar[0] = ((PUCHAR2)(Src))->Uchar[0]; \
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((PUCHAR2)(Dst))->Uchar[1] = ((PUCHAR2)(Src))->Uchar[1]; \
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}
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#define CopyUchar4(Dst,Src) { \
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((PUCHAR4)(Dst))->Uchar[0] = ((PUCHAR4)(Src))->Uchar[0]; \
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((PUCHAR4)(Dst))->Uchar[1] = ((PUCHAR4)(Src))->Uchar[1]; \
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((PUCHAR4)(Dst))->Uchar[2] = ((PUCHAR4)(Src))->Uchar[2]; \
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((PUCHAR4)(Dst))->Uchar[3] = ((PUCHAR4)(Src))->Uchar[3]; \
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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 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 PackBios(Bios,Pbios) { \
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CopyUchar2((Pbios)->BytesPerSector, &((Bios)->BytesPerSector) ); \
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CopyUchar1((Pbios)->SectorsPerCluster, &((Bios)->SectorsPerCluster)); \
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CopyUchar2((Pbios)->ReservedSectors, &((Bios)->ReservedSectors) ); \
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CopyUchar1((Pbios)->Fats, &((Bios)->Fats) ); \
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CopyUchar2((Pbios)->RootEntries, &((Bios)->RootEntries) ); \
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CopyUchar2((Pbios)->Sectors, &((Bios)->Sectors) ); \
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CopyUchar1((Pbios)->Media, &((Bios)->Media) ); \
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CopyUchar2((Pbios)->SectorsPerFat, &((Bios)->SectorsPerFat) ); \
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CopyUchar2((Pbios)->SectorsPerTrack, &((Bios)->SectorsPerTrack) ); \
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CopyUchar2((Pbios)->Heads, &((Bios)->Heads) ); \
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CopyUchar4((Pbios)->HiddenSectors, &((Bios)->HiddenSectors) ); \
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CopyUchar4((Pbios)->LargeSectors, &((Bios)->LargeSectors) ); \
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}
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//
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// And now, an extended BPBP:
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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]; // not used by fs utils
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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 _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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#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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UnpackBios( &((Bios)->Bpb), &((Pbios)->Bpb)); \
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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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// This macro packs a Packed Extended BPB.
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//
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#define PackExtendedBios( Bios, Pbios ) { \
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PackBios( &((Bios)->Bpb), &((Pbios)->Bpb)); \
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CopyUchar1( (Pbios)->IntelNearJumpCommand, &((Bios)->IntelNearJumpCommand) ); \
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CopyUchar2( (Pbios)->BootStrapJumpOffset, &((Bios)->BootStrapJumpOffset) ); \
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memcpy( (Pbios)->OemData, (Bios)->OemData, cOEM ); \
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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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CopyUchar4( (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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#endif
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