第一部分：
ARC_STATUS
BiosPartitionOpen(
IN PCHAR OpenPath,
IN OPEN_MODE OpenMode,
OUT PULONG FileId
)
{
//
// Find the partition number to open
//
if (FwGetPathMnemonicKey(OpenPath,"partition",&Key)) {
BiosPartitionClose(DiskFileId);
return(EBADF);
}
dv
Key = 1
//
// Before we open the partition, we need to find an available
// file descriptor.
//
*FileId=2;
while (BlFileTable[*FileId].Flags.Open != 0) {
*FileId += 1;
if (*FileId == BL_FILE_TABLE_SIZE) {
return(ENOENT);
}
}
kd> dv
OpenPath = 0x00000001 "--- memory read error at address 0x00000001 ---"
OpenMode = ArcOpenReadOnly (0n0)
FileId = 0x00060ecc
kd> dx -r1 ((osloader!unsigned long *)0x60ecc)
((osloader!unsigned long *)0x60ecc) : 0x60ecc : 0x3 [Type: unsigned long *]
0x3 [Type: unsigned long]
//
// We found an entry we can use, so mark it as open.
//
BlFileTable[*FileId].Flags.Open = 1;
BlFileTable[*FileId].DeviceEntryTable=&BiosPartitionEntryTable;
kd> x osloader!BiosPartitionEntryTable
0044621c osloader!BiosPartitionEntryTable = struct _BL_DEVICE_ENTRY_TABLE
kd> dx -r1 (*((osloader!_BL_DEVICE_ENTRY_TABLE *)0x44621c))
(*((osloader!_BL_DEVICE_ENTRY_TABLE *)0x44621c)) [Type: _BL_DEVICE_ENTRY_TABLE]
+0x000\] Close : 0x414d4b \[Type: unsigned long (\*)(unsigned long)
+0x004\] Mount : 0x406a56 \[Type: unsigned long (\*)(char \*,_MOUNT_OPERATION)
+0x008\] Open : 0x416019 \[Type: unsigned long (\*)(char \*,_OPEN_MODE,unsigned long \*)
+0x00c\] Read : 0x414d86 \[Type: unsigned long (\*)(unsigned long,void \*,unsigned long,unsigned long \*)
+0x010\] GetReadStatus : 0x406a56 \[Type: unsigned long (\*)(unsigned long)
+0x014\] Seek : 0x414dfb \[Type: unsigned long (\*)(unsigned long,_LARGE_INTEGER \*,_SEEK_MODE)
+0x018\] Write : 0x414e58 \[Type: unsigned long (\*)(unsigned long,void \*,unsigned long,unsigned long \*)
+0x01c\] GetFileInformation : 0x415f1b \[Type: unsigned long (\*)(unsigned long,_FILE_INFORMATION \*)
+0x020\] SetFileInformation : 0x406a56 \[Type: unsigned long (\*)(unsigned long,unsigned long,unsigned long)
+0x024\] Rename : 0x406a56 \[Type: unsigned long (\*)(unsigned long,char \*)
+0x028\] GetDirectoryEntry : 0x406a56 \[Type: unsigned long (\*)(unsigned long,_DIRECTORY_ENTRY \*,unsigned long,unsigned long \*)
+0x02c\] BootFsInfo : 0x0 \[Type: _BOOTFS_INFO \*
kd> u 406a56
osloader!BlArcNotYetImplemented [d:\srv03rtm\base\boot\lib\i386\arcemul.c @ 813]:
00406a56 55 push ebp
00406a57 8bec mov ebp,esp
00406a59 ff7508 push dword ptr [ebp+8]
00406a5c 68e8c74300 push offset osloader!`string' (0043c7e8)
00406a61 e869eeffff call osloader!BlPrint (004058cf)
00406a66 59 pop ecx
00406a67 59 pop ecx
00406a68 6a07 push 7
尚未实施;未实现;
kd> x osloader!BlFileTable
00479a00 osloader!BlFileTable = struct _BL_FILE_TABLE [48]
kd> dx -r1 (*((osloader!_BL_FILE_TABLE (*)[48])0x479a00))
(*((osloader!_BL_FILE_TABLE (*)[48])0x479a00)) [Type: _BL_FILE_TABLE [48]]
0\] \[Type: _BL_FILE_TABLE
1\] \[Type: _BL_FILE_TABLE
2\] \[Type: _BL_FILE_TABLE
3\] \[Type: _BL_FILE_TABLE
kd> dx -r1 (*((osloader!_BL_FILE_TABLE *)0x479b38))
(*((osloader!_BL_FILE_TABLE *)0x479b38)) [Type: _BL_FILE_TABLE]
+0x000\] Flags \[Type: _BL_FILE_FLAGS
+0x004\] DeviceId : 0x0 \[Type: unsigned long
+0x008\] Position : {0} \[Type: _LARGE_INTEGER
+0x010\] StructureContext : 0x0 \[Type: void \*
+0x014\] DeviceEntryTable : 0x44621c \[Type: _BL_DEVICE_ENTRY_TABLE \*\] //DeviceEntryTable : 0x44621c \[+0x018\] FileNameLength : 0x0 \[Type: unsigned char
+0x019\] FileName : "" \[Type: char \[32\]
+0x040\] u \[Type: __unnamed
kd> x osloader!BiosPartitionEntryTable
0044621c osloader!BiosPartitionEntryTable = struct _BL_DEVICE_ENTRY_TABLE
第二部分：
kd> p
osloader!BiosPartitionOpen+0x1fa:
00416213 e8c40bffff call osloader!HardDiskPartitionOpen (00406ddc)
kd> t
osloader!HardDiskPartitionOpen:
00406ddc 55 push ebp
kd> kc
00 osloader!HardDiskPartitionOpen
01 osloader!BiosPartitionOpen
02 osloader!AEOpen
03 osloader!BlGetActivePartition
04 osloader!NtProcessStartup
WARNING: Frame IP not in any known module. Following frames may be wrong.
05 0x0
06 0x0
07 osloader!`string'
08 0x0
kd> dv
FileId = 3
DiskId = 2
PartitionNumber = 0x00 ''
kd> dx -r1 ((osloader!_BL_DEVICE_ENTRY_TABLE *)0x44624c)
((osloader!_BL_DEVICE_ENTRY_TABLE *)0x44624c) : 0x44624c [Type: _BL_DEVICE_ENTRY_TABLE *]
+0x000\] Close : 0x414d0c \[Type: unsigned long (\*)(unsigned long)
+0x004\] Mount : 0x406a56 \[Type: unsigned long (\*)(char \*,_MOUNT_OPERATION)
+0x008\] Open : 0x415526 \[Type: unsigned long (\*)(char \*,_OPEN_MODE,unsigned long \*)
+0x00c\] Read : 0x415edd \[Type: unsigned long (\*)(unsigned long,void \*,unsigned long,unsigned long \*)
+0x010\] GetReadStatus : 0x406a56 \[Type: unsigned long (\*)(unsigned long)
+0x014\] Seek : 0x414dfb \[Type: unsigned long (\*)(unsigned long,_LARGE_INTEGER \*,_SEEK_MODE)
+0x018\] Write : 0x415798 \[Type: unsigned long (\*)(unsigned long,void \*,unsigned long,unsigned long \*)
+0x01c\] GetFileInformation : 0x415f70 \[Type: unsigned long (\*)(unsigned long,_FILE_INFORMATION \*)
+0x020\] SetFileInformation : 0x406a56 \[Type: unsigned long (\*)(unsigned long,unsigned long,unsigned long)
+0x024\] Rename : 0x406a56 \[Type: unsigned long (\*)(unsigned long,char \*)
+0x028\] GetDirectoryEntry : 0x406a56 \[Type: unsigned long (\*)(unsigned long,_DIRECTORY_ENTRY \*,unsigned long,unsigned long \*)
+0x02c\] BootFsInfo : 0x0 \[Type: _BOOTFS_INFO \*
kd> u 414dfb
osloader!BiosPartitionSeek [d:\srv03rtm\base\boot\lib\i386\biosdrv.c @ 548]:
00414dfb 55 push ebp
00414dfc 8bec mov ebp,esp
00414dfe 8b4510 mov eax,dword ptr [ebp+10h]
00414e01 83e800 sub eax,0
00414e04 7432 je osloader!BiosPartitionSeek+0x3d (00414e38)
00414e06 48 dec eax
00414e07 7414 je osloader!BiosPartitionSeek+0x22 (00414e1d)
00414e09 ff7510 push dword ptr [ebp+10h]
ULONG PartitionOffset=0;
dv
PartitionOffset = 0
kd> p
osloader!HardDiskPartitionOpen+0x5e:
00406e3a ff5014 call dword ptr [eax+14h]
kd> r
eax=0044624c ebx=00000200 ecx=00060bd0 edx=00000000 esi=00000138 edi=00479ae4
eip=00406e3a esp=000609b4 ebp=00060be4 iopl=0 nv up di pl nz na pe nc
cs=0008 ss=0010 ds=0010 es=0010 fs=0030 gs=0000 efl=00000006
osloader!HardDiskPartitionOpen+0x5e:
00406e3a ff5014 call dword ptr [eax+14h] ds:0010:00446260={osloader!BiosPartitionSeek (00414dfb)}
第三部分：
kd> r
eax=0044624c ebx=00000200 ecx=00060bd0 edx=00000000 esi=00000138 edi=00479ae4
eip=00406e3a esp=000609b4 ebp=00060be4 iopl=0 nv up di pl nz na pe nc
cs=0008 ss=0010 ds=0010 es=0010 fs=0030 gs=0000 efl=00000006
osloader!HardDiskPartitionOpen+0x5e:
00406e3a ff5014 call dword ptr [eax+14h] ds:0010:00446260={osloader!BiosPartitionSeek (00414dfb)}
kd> t
osloader!BiosPartitionSeek:
00414dfb 55 push ebp
kd> kc
00 osloader!BiosPartitionSeek
01 osloader!HardDiskPartitionOpen
02 osloader!BiosPartitionOpen
03 osloader!AEOpen
04 osloader!BlGetActivePartition
05 osloader!NtProcessStartup
WARNING: Frame IP not in any known module. Following frames may be wrong.
06 0x0
07 0x0
08 osloader!`string'
09 0x0
ARC_STATUS
BiosPartitionSeek (
IN ULONG FileId,
IN PLARGE_INTEGER Offset,
IN SEEK_MODE SeekMode
)
{
switch (SeekMode) {
case SeekAbsolute:
BlFileTable[FileId].Position = *Offset;
break;
case SeekRelative:
BlFileTable[FileId].Position.QuadPart += Offset->QuadPart;
break;
default:
#if DBG
BlPrint("SeekMode %lx not supported\n",SeekMode);
#endif
return(EACCES);
}
第四部分：
kd> dx -r1 (*((osloader!_BL_FILE_TABLE *)0x479ad0))
(*((osloader!_BL_FILE_TABLE *)0x479ad0)) [Type: _BL_FILE_TABLE]
+0x000\] Flags \[Type: _BL_FILE_FLAGS
+0x004\] DeviceId : 0x0 \[Type: unsigned long
+0x008\] Position : {0} \[Type: _LARGE_INTEGER
+0x010\] StructureContext : 0x0 \[Type: void \*
+0x014\] DeviceEntryTable : 0x44624c \[Type: _BL_DEVICE_ENTRY_TABLE \*
+0x018\] FileNameLength : 0x0 \[Type: unsigned char
+0x019\] FileName : "" \[Type: char \[32\]
+0x040\] u \[Type: __unnamed
Status = (BlFileTable[DiskId].DeviceEntryTable->Read)(DiskId,
DataBuffer,
SECTOR_SIZE,
&Count );
kd> p
osloader!HardDiskPartitionOpen+0x7a:
00406e56 ff500c call dword ptr [eax+0Ch]
kd> r
eax=0044624c ebx=00000200 ecx=000609cc edx=00000000 esi=00000138 edi=00479ae4
eip=00406e56 esp=000609b0 ebp=00060be4 iopl=0 nv up di pl zr na pe nc
cs=0008 ss=0010 ds=0010 es=0010 fs=0030 gs=0000 efl=00000046
osloader!HardDiskPartitionOpen+0x7a:
00406e56 ff500c call dword ptr [eax+0Ch] ds:0010:00446258={osloader!BiosDiskRead (00415edd)}
第五部分：
ARC_STATUS
BiosDiskRead(
IN ULONG FileId,
OUT PVOID Buffer,
IN ULONG Length,
OUT PULONG Count
)
{
USHORT PhysicalSectors;
PhysicalSectors = SECTOR_SIZE;
return(pBiosDiskReadWorker(FileId,Buffer,Length,Count,PhysicalSectors,FALSE));
}
kd> t
osloader!BiosDiskRead:
00415edd 55 push ebp
kd> dv
FileId = 2
Buffer = 0x000609cc
Length = 0x200
Count = 0x00060bcc
kd> kc
00 osloader!BiosDiskRead
01 osloader!HardDiskPartitionOpen
02 osloader!BiosPartitionOpen
03 osloader!AEOpen
04 osloader!BlGetActivePartition
05 osloader!NtProcessStartup
WARNING: Frame IP not in any known module. Following frames may be wrong.
06 0x0
07 0x0
08 osloader!`string'
09 0x0
第六部分：
kd> p
osloader!BiosDiskRead+0x16:
00415ef3 e8bcfbffff call osloader!pBiosDiskReadWorker (00415ab4)
kd> t
osloader!pBiosDiskReadWorker:
00415ab4 55 push ebp
kd> kc
00 osloader!pBiosDiskReadWorker
01 osloader!BiosDiskRead
02 osloader!HardDiskPartitionOpen
03 osloader!BiosPartitionOpen
04 osloader!AEOpen
05 osloader!BlGetActivePartition
06 osloader!NtProcessStartup
WARNING: Frame IP not in any known module. Following frames may be wrong.
07 0x0
08 0x0
09 osloader!`string'
0a 0x0
kd> dv
FileId = 2
Buffer = 0x000609cc
Length = 0x200
Count = 0x00060bcc
SectorSize = 0x200
xInt13 = 0x00 ''
kd> x osloader!FwLastSectorCache
00446eb0 osloader!FwLastSectorCache = struct _BL_LAST_SECTOR_CACHE
kd> dx -r1 (*((osloader!_BL_LAST_SECTOR_CACHE *)0x446eb0))
(*((osloader!_BL_LAST_SECTOR_CACHE *)0x446eb0)) [Type: _BL_LAST_SECTOR_CACHE]
+0x000\] Initialized : 0x0 \[Type: unsigned char
+0x001\] Valid : 0x0 \[Type: unsigned char
+0x004\] DeviceId : 0x0 \[Type: unsigned long
+0x008\] SectorNumber : 0x0 \[Type: unsigned __int64
+0x010\] Data : 0x0 \[Type: unsigned char \*
//
// Initialize the last sector cache if it has not been
// initialized.
//
if (!FwLastSectorCache.Initialized) {
FwLastSectorCache.Data =
FwAllocatePool(BL_LAST_SECTOR_CACHE_MAX_SIZE);
if (FwLastSectorCache.Data) {
FwLastSectorCache.Initialized = TRUE;
}
}
kd> x osloader!FwLastSectorCache
00446eb0 osloader!FwLastSectorCache = struct _BL_LAST_SECTOR_CACHE
kd> dx -r1 (*((osloader!_BL_LAST_SECTOR_CACHE *)0x446eb0))
(*((osloader!_BL_LAST_SECTOR_CACHE *)0x446eb0)) [Type: _BL_LAST_SECTOR_CACHE]
+0x000\] Initialized : 0x1 \[Type: unsigned char
+0x001\] Valid : 0x0 \[Type: unsigned char
+0x004\] DeviceId : 0x0 \[Type: unsigned long
+0x008\] SectorNumber : 0x0 \[Type: unsigned __int64
+0x010\] Data : 0x48a000 : 0x0 \[Type: unsigned char \*
//
// Gather disk stats. 搜集磁盘状态，就是上面的osloader!BiosDiskOpen之后存储在BlFileTable[FileId]的信息
//
SectorsPerTrack = BlFileTable[FileId].u.DriveContext.Sectors;
Heads = BlFileTable[FileId].u.DriveContext.Heads;
Cylinders = BlFileTable[FileId].u.DriveContext.Cylinders;
AllowXInt13 = BlFileTable[FileId].u.DriveContext.xInt13;
Int13Unit = BlFileTable[FileId].u.DriveContext.Drive;
dv
Heads = 0xff
Cylinders = 0x3ff
SectorsPerTrack = 0x3f '?'
AllowXInt13 = 0x01 ''
参考BlFileTable[2]：
kd> dx -r1 (*((osloader!_DRIVE_CONTEXT *)0x479b10))
(*((osloader!_DRIVE_CONTEXT *)0x479b10)) [Type: _DRIVE_CONTEXT]
+0x000\] IsCd : 0x0 \[Type: unsigned char
+0x001\] Drive : 0x80 \[Type: unsigned char
+0x002\] Sectors : 0x3f \[Type: unsigned char
+0x004\] Cylinders : 0x3ff \[Type: unsigned short
+0x006\] Heads : 0xff \[Type: unsigned short
+0x008\] xInt13 : 0x1 \[Type: unsigned char
参考BlFileTable[2]：
HeadSector = BlFileTable[FileId].Position.QuadPart / SectorSize;
HeadOffset = (ULONG)(BlFileTable[FileId].Position.QuadPart % SectorSize);
TailSector = (BlFileTable[FileId].Position.QuadPart + Length - 1) / SectorSize;
TailByteCount = (ULONG)((BlFileTable[FileId].Position.QuadPart + Length - 1) % SectorSize);
TailByteCount ++;
if (((ULONG_PTR) pDestInUserBuffer + NumBytesToTransfer < BIOSDISK_1MB) &&
(((ULONG_PTR) pDestInUserBuffer & BIOSDISK_64KB_MASK) ==
(((ULONG_PTR) pDestInUserBuffer + NumBytesToTransfer) & BIOSDISK_64KB_MASK)) &&
((pEndOfUserBuffer - pDestInUserBuffer) >= (LONG) NumBytesToTransfer)) {
pTransferDest = pDestInUserBuffer;
}
kd> dv pTransferDest
pTransferDest = 0x000609cc "???"
第七部分：
//
// Perform the read.
//
if(xInt13) {
Status = ReadExtendedPhysicalSectors(Int13Unit,
CurrentSector,
SectorsToTransfer,
pTransferDest);
} else {
Status = ReadPhysicalSectors(Int13Unit,
CurrentSector,
SectorsToTransfer,
pTransferDest,
SectorsPerTrack,
Heads,
Cylinders,
AllowXInt13);
}
kd> dv xInt13
xInt13 = 0x00 ''
+0x008\] xInt13 : 0x1 \[Type: unsigned char
kd> p
osloader!pBiosDiskReadWorker+0x26b:
00415d1f ff75e4 push dword ptr [ebp-1Ch]
kd> p
osloader!pBiosDiskReadWorker+0x26e:
00415d22 e8997f0000 call osloader!XferPhysicalDiskSectors (0041dcc0)
kd> x osloader!XferPhysicalDiskSectors
0041dcc0 osloader!XferPhysicalDiskSectors (unsigned char, unsigned int64, unsigned char, unsigned char *, unsigned char, unsigned short, unsigned short, unsigned char, unsigned char)
kd> u 41dcc0
osloader!XferPhysicalDiskSectors [d:\srv03rtm\base\boot\lib\i386\machine.c @ 171]:
0041dcc0 55 push ebp
0041dcc1 8bec mov ebp,esp
0041dcc3 83ec10 sub esp,10h
0041dcc6 0fb64514 movzx eax,byte ptr [ebp+14h]
0041dcca c1e009 shl eax,9
0041dccd 034518 add eax,dword ptr [ebp+18h]
0041dcd0 3d00001000 cmp eax,100000h
0041dcd5 7608 jbe osloader!XferPhysicalDiskSectors+0x1f (0041dcdf)
kd> kc 8
00 osloader!XferPhysicalDiskSectors
01 osloader!pBiosDiskReadWorker
02 osloader!BiosDiskRead
03 osloader!HardDiskPartitionOpen
04 osloader!BiosPartitionOpen
05 osloader!AEOpen
06 osloader!BlGetActivePartition
07 osloader!NtProcessStartup
//
// Figure out CHS values. Note that we use a ULONGLONG for the cylinder,
// because it could overflow 1023 if the start sector is large.
//
SectorsPerCylinder = SectorsPerTrack * Heads;
cylinder = (ULONG)(StartSector / SectorsPerCylinder);
r = StartSector % SectorsPerCylinder;
head = (USHORT)(r / SectorsPerTrack);
sector = (UCHAR)(r % SectorsPerTrack) + 1;
kd> dv
Int13UnitNumber = 0x80 ''
StartSector = 0
SectorCount = 0x01 ''
Buffer = 0x000609cc "???"
SectorsPerTrack = 0x3f '?'
Heads = 0xff
Cylinders = 0x3ff
AllowExtendedInt13 = 0x01 ''
Write = 0x00 ''
sector = 0x3f '?'
s = 0xffffff01
第八部分：
D:\srv03rtm\base\boot/inc/bldrx86.h:251:#define GET_SECTOR (*ExternalServicesTable->DiskIOSystem)
//
// OK, xfer the sectors via conventional int13.
//
retry = (Int13UnitNumber < 128) ? 3 : 1;
do {
s = GET_SECTOR(
(UCHAR)(Write ? 3 : 2), // int13 function number
Int13UnitNumber,
head,
(USHORT)cylinder, // we know it's 0-1023
sector,
SectorCount,
Buffer
);
kd> p
osloader!XferPhysicalDiskSectors+0x131:
0041ddf1 ff5004 call dword ptr [eax+4]
kd> r
eax=000244ec ebx=00000002 ecx=00000001 edx=00000000 esi=00000001 edi=00000000
eip=0041ddf1 esp=000608b0 ebp=000608e8 iopl=0 nv up di pl nz na po nc
cs=0008 ss=0010 ds=0010 es=0010 fs=0030 gs=0000 efl=00000002
osloader!XferPhysicalDiskSectors+0x131:
0041ddf1 ff5004 call dword ptr [eax+4] ds:0010:000244f0=00022e6c
参考：
kd> dx -r1 ((osloader!_EXTERNAL_SERVICES_TABLE *)0x244ec)
((osloader!_EXTERNAL_SERVICES_TABLE *)0x244ec) : 0x244ec [Type: _EXTERNAL_SERVICES_TABLE *]
+0x000\] RebootProcessor : 0x22e60 \[Type: void (__cdecl\*)()
+0x004\] DiskIOSystem : 0x22e6c \[Type: long (__cdecl\*)(unsigned char,unsigned char,unsigned short,unsigned short,unsigned char,unsigned char,unsigned char \*)\]//DiskIOSystem : 0x22e6c \[+0x008\] GetKey : 0x22e84 \[Type: unsigned long (__cdecl\*)()
+0x00c\] GetCounter : 0x22e90 \[Type: unsigned long (__cdecl\*)()
+0x010\] Reboot : 0x22e9c \[Type: void (__cdecl\*)(unsigned long)
+0x014\] DetectHardware : 0x22ec0 \[Type: void (__cdecl\*)(unsigned long,unsigned long,void \*,unsigned long \*,char \*,unsigned long)
+0x018\] HardwareCursor : 0x22ea8 \[Type: void (__cdecl\*)(unsigned long,unsigned long)
+0x01c\] GetDateTime : 0x22eb4 \[Type: void (__cdecl\*)(unsigned long \*,unsigned long \*)
+0x020\] ComPort : 0x22ecc \[Type: void (__cdecl\*)(long,unsigned long,unsigned char)
+0x024\] GetStallCount : 0x22ed8 \[Type: unsigned long (__cdecl\*)()
+0x028\] InitializeDisplayForNt : 0x22ee4 \[Type: void (__cdecl\*)()
+0x02c\] GetMemoryDescriptor : 0x22ef0 \[Type: void (__cdecl\*)()
+0x030\] GetEddsSector : 0x22e78 \[Type: long (__cdecl\*)(unsigned char,unsigned long,unsigned long,unsigned short,unsigned char \*,unsigned char)
+0x034\] GetElToritoStatus : 0x22efc \[Type: long (__cdecl\*)(unsigned char \*,unsigned char)
+0x038\] GetExtendedInt13Params : 0x22f08 \[Type: unsigned char (__cdecl\*)(unsigned char \*,unsigned char)
+0x03c\] NetPcRomServices : 0x0 \[Type: unsigned short (__cdecl\*)(unsigned long,void \*)
+0x040\] ApmAttemptReconnect : 0x22f14 \[Type: void (__cdecl\*)()
+0x044\] BiosRedirectService : 0x0 \[Type: unsigned long (__cdecl\*)(unsigned long)
参考：