4 * Copyright (C) 1998-2003 Brian Palmer <brianp@sginet.com>
5 * Copyright (C) 2006 Aleksey Bragin <aleksey@reactos.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <ndk/ldrtypes.h>
27 //FIXME: Do a better way to retrieve Arc disk information
28 extern ULONG reactos_disk_count
;
29 extern ARC_DISK_SIGNATURE reactos_arc_disk_info
[];
30 extern char reactos_arc_strings
[32][256];
32 extern BOOLEAN UseRealHeap
;
35 WinLdrCheckForLoadedDll(IN OUT PLOADER_PARAMETER_BLOCK WinLdrBlock
,
37 OUT PLDR_DATA_TABLE_ENTRY
*LoadedEntry
);
40 VOID
DumpMemoryAllocMap(VOID
);
41 VOID
WinLdrpDumpMemoryDescriptors(PLOADER_PARAMETER_BLOCK LoaderBlock
);
42 VOID
WinLdrpDumpBootDriver(PLOADER_PARAMETER_BLOCK LoaderBlock
);
43 VOID
WinLdrpDumpArcDisks(PLOADER_PARAMETER_BLOCK LoaderBlock
);
48 AllocateAndInitLPB(PLOADER_PARAMETER_BLOCK
*OutLoaderBlock
)
50 PLOADER_PARAMETER_BLOCK LoaderBlock
;
52 /* Allocate and zero-init the LPB */
53 LoaderBlock
= MmHeapAlloc(sizeof(LOADER_PARAMETER_BLOCK
));
54 RtlZeroMemory(LoaderBlock
, sizeof(LOADER_PARAMETER_BLOCK
));
56 /* Init three critical lists, used right away */
57 InitializeListHead(&LoaderBlock
->LoadOrderListHead
);
58 InitializeListHead(&LoaderBlock
->MemoryDescriptorListHead
);
59 InitializeListHead(&LoaderBlock
->BootDriverListHead
);
61 /* Alloc space for NLS (it will be converted to VA in WinLdrLoadNLS) */
62 LoaderBlock
->NlsData
= MmHeapAlloc(sizeof(NLS_DATA_BLOCK
));
63 if (LoaderBlock
->NlsData
== NULL
)
65 UiMessageBox("Failed to allocate memory for NLS table data!");
68 RtlZeroMemory(LoaderBlock
->NlsData
, sizeof(NLS_DATA_BLOCK
));
70 *OutLoaderBlock
= LoaderBlock
;
75 WinLdrInitializePhase1(PLOADER_PARAMETER_BLOCK LoaderBlock
,
80 /* Examples of correct options and paths */
81 //CHAR Options[] = "/DEBUGPORT=COM1 /BAUDRATE=115200";
82 //CHAR Options[] = "/NODEBUG";
83 //CHAR SystemRoot[] = "\\WINNT\\";
84 //CHAR ArcBoot[] = "multi(0)disk(0)rdisk(0)partition(1)";
86 CHAR HalPath
[] = "\\";
89 ULONG i
, PathSeparator
;
90 PLOADER_PARAMETER_EXTENSION Extension
;
92 LoaderBlock
->u
.I386
.CommonDataArea
= NULL
; // Force No ABIOS support
94 /* Construct SystemRoot and ArcBoot from SystemPath */
95 PathSeparator
= strstr(SystemPath
, "\\") - SystemPath
;
96 strncpy(ArcBoot
, SystemPath
, PathSeparator
);
97 ArcBoot
[PathSeparator
] = 0;
98 strcpy(SystemRoot
, &SystemPath
[PathSeparator
]);
99 strcat(SystemRoot
, "\\");
101 DbgPrint((DPRINT_WINDOWS
, "ArcBoot: %s\n", ArcBoot
));
102 DbgPrint((DPRINT_WINDOWS
, "SystemRoot: %s\n", SystemRoot
));
103 DbgPrint((DPRINT_WINDOWS
, "Options: %s\n", Options
));
105 /* Fill Arc BootDevice */
106 LoaderBlock
->ArcBootDeviceName
= MmHeapAlloc(strlen(ArcBoot
)+1);
107 strcpy(LoaderBlock
->ArcBootDeviceName
, ArcBoot
);
108 LoaderBlock
->ArcBootDeviceName
= PaToVa(LoaderBlock
->ArcBootDeviceName
);
110 /* Fill Arc HalDevice, it matches ArcBoot path */
111 LoaderBlock
->ArcHalDeviceName
= MmHeapAlloc(strlen(ArcBoot
)+1);
112 strcpy(LoaderBlock
->ArcHalDeviceName
, ArcBoot
);
113 LoaderBlock
->ArcHalDeviceName
= PaToVa(LoaderBlock
->ArcHalDeviceName
);
115 /* Fill SystemRoot */
116 LoaderBlock
->NtBootPathName
= MmHeapAlloc(strlen(SystemRoot
)+1);
117 strcpy(LoaderBlock
->NtBootPathName
, SystemRoot
);
118 LoaderBlock
->NtBootPathName
= PaToVa(LoaderBlock
->NtBootPathName
);
120 /* Fill NtHalPathName */
121 LoaderBlock
->NtHalPathName
= MmHeapAlloc(strlen(HalPath
)+1);
122 strcpy(LoaderBlock
->NtHalPathName
, HalPath
);
123 LoaderBlock
->NtHalPathName
= PaToVa(LoaderBlock
->NtHalPathName
);
125 /* Fill load options */
126 LoaderBlock
->LoadOptions
= MmHeapAlloc(strlen(Options
)+1);
127 strcpy(LoaderBlock
->LoadOptions
, Options
);
128 LoaderBlock
->LoadOptions
= PaToVa(LoaderBlock
->LoadOptions
);
131 LoaderBlock
->ArcDiskInformation
= (PARC_DISK_INFORMATION
)MmHeapAlloc(sizeof(ARC_DISK_INFORMATION
));
132 InitializeListHead(&LoaderBlock
->ArcDiskInformation
->DiskSignatureListHead
);
134 /* Convert ARC disk information from freeldr to a correct format */
135 for (i
= 0; i
< reactos_disk_count
; i
++)
137 PARC_DISK_SIGNATURE ArcDiskInfo
;
139 /* Get the ARC structure */
140 ArcDiskInfo
= (PARC_DISK_SIGNATURE
)MmHeapAlloc(sizeof(ARC_DISK_SIGNATURE
));
141 RtlZeroMemory(ArcDiskInfo
, sizeof(ARC_DISK_SIGNATURE
));
143 /* Copy the data over */
144 ArcDiskInfo
->Signature
= reactos_arc_disk_info
[i
].Signature
;
145 ArcDiskInfo
->CheckSum
= reactos_arc_disk_info
[i
].CheckSum
;
147 /* Copy the ARC Name */
148 ArcDiskInfo
->ArcName
= (PCHAR
)MmHeapAlloc(sizeof(CHAR
)*256);
149 strcpy(ArcDiskInfo
->ArcName
, reactos_arc_disk_info
[i
].ArcName
);
150 ArcDiskInfo
->ArcName
= (PCHAR
)PaToVa(ArcDiskInfo
->ArcName
);
152 /* Mark partition table as valid */
153 ArcDiskInfo
->ValidPartitionTable
= TRUE
;
155 /* Insert into the list */
156 InsertTailList(&LoaderBlock
->ArcDiskInformation
->DiskSignatureListHead
,
157 &ArcDiskInfo
->ListEntry
);
160 /* Convert all list's to Virtual address */
162 /* Convert the ArcDisks list to virtual address */
163 List_PaToVa(&LoaderBlock
->ArcDiskInformation
->DiskSignatureListHead
);
164 LoaderBlock
->ArcDiskInformation
= PaToVa(LoaderBlock
->ArcDiskInformation
);
166 /* Convert configuration entries to VA */
167 ConvertConfigToVA(LoaderBlock
->ConfigurationRoot
);
168 LoaderBlock
->ConfigurationRoot
= PaToVa(LoaderBlock
->ConfigurationRoot
);
170 /* Convert all DTE into virtual addresses */
171 List_PaToVa(&LoaderBlock
->LoadOrderListHead
);
173 /* this one will be converted right before switching to
174 virtual paging mode */
175 //List_PaToVa(&LoaderBlock->MemoryDescriptorListHead);
177 /* Convert list of boot drivers */
178 List_PaToVa(&LoaderBlock
->BootDriverListHead
);
180 /* Initialize Extension now */
181 Extension
= MmHeapAlloc(sizeof(LOADER_PARAMETER_EXTENSION
));
182 if (Extension
== NULL
)
184 UiMessageBox("Failed to allocate LPB Extension!");
187 RtlZeroMemory(Extension
, sizeof(LOADER_PARAMETER_EXTENSION
));
189 /* Save size and version information */
190 Extension
->Size
= sizeof(LOADER_PARAMETER_EXTENSION
);
191 Extension
->MajorVersion
= (VersionToBoot
& 0xFF00) >> 8;
192 Extension
->MinorVersion
= VersionToBoot
& 0xFF;
193 Extension
->LoaderPagesSpanned
= LOADER_HIGH_ZONE
;
196 LoaderBlock
->Extension
= PaToVa(Extension
);
199 // Last step before going virtual
200 void WinLdrSetupForNt(PLOADER_PARAMETER_BLOCK LoaderBlock
,
209 ULONG BlockSize
, NumPages
;
211 LoaderBlock
->u
.I386
.CommonDataArea
= NULL
;//CommonDataArea;
212 //LoaderBlock->u.I386.MachineType = MachineType; //FIXME: MachineType?
214 /* Allocate 2 pages for PCR */
215 Pcr
= (ULONG_PTR
)MmAllocateMemoryWithType(2 * MM_PAGE_SIZE
, LoaderStartupPcrPage
);
216 *PcrBasePage
= Pcr
>> MM_PAGE_SHIFT
;
220 UiMessageBox("Can't allocate PCR\n");
225 TssSize
= (sizeof(KTSS
) + MM_PAGE_SIZE
) & ~(MM_PAGE_SIZE
- 1);
226 TssPages
= TssSize
/ MM_PAGE_SIZE
;
228 Tss
= (ULONG_PTR
)MmAllocateMemoryWithType(TssSize
, LoaderMemoryData
);
230 *TssBasePage
= Tss
>> MM_PAGE_SHIFT
;
232 /* Allocate space for new GDT + IDT */
233 BlockSize
= NUM_GDT
*sizeof(KGDTENTRY
) + NUM_IDT
*sizeof(KIDTENTRY
);//FIXME: Use GDT/IDT limits here?
234 NumPages
= (BlockSize
+ MM_PAGE_SIZE
- 1) >> MM_PAGE_SHIFT
;
235 *GdtIdt
= (PKGDTENTRY
)MmAllocateMemoryWithType(NumPages
* MM_PAGE_SIZE
, LoaderMemoryData
);
239 UiMessageBox("Can't allocate pages for GDT+IDT!\n");
243 /* Zero newly prepared GDT+IDT */
244 RtlZeroMemory(*GdtIdt
, NumPages
<< MM_PAGE_SHIFT
);
248 WinLdrLoadDeviceDriver(PLOADER_PARAMETER_BLOCK LoaderBlock
,
250 PUNICODE_STRING FilePath
,
252 PLDR_DATA_TABLE_ENTRY
*DriverDTE
)
255 CHAR DriverPath
[1024];
261 // Separate the path to file name and directory path
262 sprintf(DriverPath
, "%wZ", FilePath
);
263 DriverNamePos
= strrchr(DriverPath
, '\\');
264 if (DriverNamePos
!= NULL
)
267 strcpy(DllName
, DriverNamePos
+1);
269 // Cut out the name from the path
270 *(DriverNamePos
+1) = 0;
273 DbgPrint((DPRINT_WINDOWS
, "DriverPath: %s, DllName: %s, LPB %p\n", DriverPath
, DllName
, LoaderBlock
));
276 // Check if driver is already loaded
277 Status
= WinLdrCheckForLoadedDll(LoaderBlock
, DllName
, DriverDTE
);
280 // We've got the pointer to its DTE, just return success
284 // It's not loaded, we have to load it
285 sprintf(FullPath
,"%s%wZ", BootPath
, FilePath
);
286 Status
= WinLdrLoadImage(FullPath
, LoaderBootDriver
, &DriverBase
);
290 // Allocate a DTE for it
291 Status
= WinLdrAllocateDataTableEntry(LoaderBlock
, DllName
, DllName
, DriverBase
, DriverDTE
);
294 DbgPrint((DPRINT_WINDOWS
, "WinLdrAllocateDataTableEntry() failed\n"));
298 // Modify any flags, if needed
299 (*DriverDTE
)->Flags
|= Flags
;
301 // Look for any dependencies it may have, and load them too
302 sprintf(FullPath
,"%s%s", BootPath
, DriverPath
);
303 Status
= WinLdrScanImportDescriptorTable(LoaderBlock
, FullPath
, *DriverDTE
);
306 DbgPrint((DPRINT_WINDOWS
, "WinLdrScanImportDescriptorTable() failed for %s\n",
315 WinLdrLoadBootDrivers(PLOADER_PARAMETER_BLOCK LoaderBlock
,
319 PBOOT_DRIVER_LIST_ENTRY BootDriver
;
322 // Walk through the boot drivers list
323 NextBd
= LoaderBlock
->BootDriverListHead
.Flink
;
325 while (NextBd
!= &LoaderBlock
->BootDriverListHead
)
327 BootDriver
= CONTAINING_RECORD(NextBd
, BOOT_DRIVER_LIST_ENTRY
, ListEntry
);
329 DbgPrint((DPRINT_WINDOWS
, "BootDriver %wZ DTE %08X RegPath: %wZ\n", &BootDriver
->FilePath
,
330 BootDriver
->DataTableEntry
, &BootDriver
->RegistryPath
));
332 // Paths are relative (FIXME: Are they always relative?)
335 Status
= WinLdrLoadDeviceDriver(LoaderBlock
, BootPath
, &BootDriver
->FilePath
,
336 0, &BootDriver
->DataTableEntry
);
338 // If loading failed - cry loudly
339 //FIXME: Maybe remove it from the list and try to continue?
342 UiMessageBox("Can't load boot driver!");
346 // Convert the RegistryPath and DTE addresses to VA since we are not going to use it anymore
347 BootDriver
->RegistryPath
.Buffer
= PaToVa(BootDriver
->RegistryPath
.Buffer
);
348 BootDriver
->DataTableEntry
= PaToVa(BootDriver
->DataTableEntry
);
350 NextBd
= BootDriver
->ListEntry
.Flink
;
357 LoadAndBootWindows(PCSTR OperatingSystemName
, WORD OperatingSystemVersion
)
360 CHAR SystemPath
[512], SearchPath
[512];
363 CHAR BootOptions
[256];
364 PVOID NtosBase
= NULL
, HalBase
= NULL
, KdComBase
= NULL
;
368 PLOADER_PARAMETER_BLOCK LoaderBlock
, LoaderBlockVA
;
369 KERNEL_ENTRY_POINT KiSystemStartup
;
370 PLDR_DATA_TABLE_ENTRY KernelDTE
, HalDTE
, KdComDTE
= NULL
;
376 //sprintf(MsgBuffer,"Booting Microsoft(R) Windows(R) OS version '%04x' is not implemented yet", OperatingSystemVersion);
377 //UiMessageBox(MsgBuffer);
379 // Open the operating system section
380 // specified in the .ini file
381 if (!IniOpenSection(OperatingSystemName
, &SectionId
))
383 sprintf(MsgBuffer
,"Operating System section '%s' not found in freeldr.ini", OperatingSystemName
);
384 UiMessageBox(MsgBuffer
);
389 UiDrawStatusText("Detecting Hardware...");
390 UiDrawProgressBarCenter(1, 100, "Loading Windows...");
392 /* Make sure the system path is set in the .ini file */
393 if (!IniReadSettingByName(SectionId
, "SystemPath", SystemPath
, sizeof(SystemPath
)))
395 UiMessageBox("System path not specified for selected operating system.");
399 /* Read booting options */
400 if (!IniReadSettingByName(SectionId
, "Options", BootOptions
, sizeof(BootOptions
)))
402 /* Nothing read, make the string empty */
403 strcpy(BootOptions
, "");
406 /* Normalize system path */
407 if (!MachDiskNormalizeSystemPath(SystemPath
, sizeof(SystemPath
)))
409 UiMessageBox("Invalid system path");
413 /* Let user know we started loading */
414 UiDrawStatusText("Loading...");
416 /* Try to open system drive */
417 BootDevice
= 0xffffffff;
418 if (!FsOpenSystemVolume(SystemPath
, BootPath
, &BootDevice
))
420 UiMessageBox("Failed to open boot drive.");
424 /* append a backslash */
425 if ((strlen(BootPath
)==0) ||
426 BootPath
[strlen(BootPath
)] != '\\')
427 strcat(BootPath
, "\\");
429 DbgPrint((DPRINT_WINDOWS
,"SystemRoot: '%s'\n", BootPath
));
431 /* Allocate and minimalistic-initialize LPB */
432 AllocateAndInitLPB(&LoaderBlock
);
434 /* Detect hardware */
436 LoaderBlock
->ConfigurationRoot
= MachHwDetect();
439 strcpy(FileName
, BootPath
);
440 strcat(FileName
, "SYSTEM32\\NTOSKRNL.EXE");
441 Status
= WinLdrLoadImage(FileName
, LoaderSystemCode
, &NtosBase
);
442 DbgPrint((DPRINT_WINDOWS
, "Ntos loaded with status %d at %p\n", Status
, NtosBase
));
445 strcpy(FileName
, BootPath
);
446 strcat(FileName
, "SYSTEM32\\HAL.DLL");
447 Status
= WinLdrLoadImage(FileName
, LoaderHalCode
, &HalBase
);
448 DbgPrint((DPRINT_WINDOWS
, "HAL loaded with status %d at %p\n", Status
, HalBase
));
450 /* Load kernel-debugger support dll */
451 if (OperatingSystemVersion
> _WIN32_WINNT_WIN2K
)
453 strcpy(FileName
, BootPath
);
454 strcat(FileName
, "SYSTEM32\\KDCOM.DLL");
455 Status
= WinLdrLoadImage(FileName
, LoaderBootDriver
, &KdComBase
);
456 DbgPrint((DPRINT_WINDOWS
, "KdCom loaded with status %d at %p\n", Status
, KdComBase
));
459 /* Allocate data table entries for above-loaded modules */
460 WinLdrAllocateDataTableEntry(LoaderBlock
, "ntoskrnl.exe",
461 "WINNT\\SYSTEM32\\NTOSKRNL.EXE", NtosBase
, &KernelDTE
);
462 WinLdrAllocateDataTableEntry(LoaderBlock
, "hal.dll",
463 "WINNT\\SYSTEM32\\HAL.DLL", HalBase
, &HalDTE
);
464 if (OperatingSystemVersion
> _WIN32_WINNT_WIN2K
)
466 WinLdrAllocateDataTableEntry(LoaderBlock
, "kdcom.dll",
467 "WINNT\\SYSTEM32\\KDCOM.DLL", KdComBase
, &KdComDTE
);
470 /* Load all referenced DLLs for kernel, HAL and kdcom.dll */
471 strcpy(SearchPath
, BootPath
);
472 strcat(SearchPath
, "SYSTEM32\\");
473 WinLdrScanImportDescriptorTable(LoaderBlock
, SearchPath
, KernelDTE
);
474 WinLdrScanImportDescriptorTable(LoaderBlock
, SearchPath
, HalDTE
);
476 WinLdrScanImportDescriptorTable(LoaderBlock
, SearchPath
, KdComDTE
);
478 /* Load Hive, and then NLS data, OEM font, and prepare boot drivers list */
479 Status
= WinLdrLoadAndScanSystemHive(LoaderBlock
, BootPath
);
480 DbgPrint((DPRINT_WINDOWS
, "SYSTEM hive loaded and scanned with status %d\n", Status
));
482 /* Load boot drivers */
483 Status
= WinLdrLoadBootDrivers(LoaderBlock
, BootPath
);
484 DbgPrint((DPRINT_WINDOWS
, "Boot drivers loaded with status %d\n", Status
));
486 /* Initialize Phase 1 - no drivers loading anymore */
487 WinLdrInitializePhase1(LoaderBlock
, BootOptions
, SystemPath
, OperatingSystemVersion
);
489 /* Alloc PCR, TSS, do magic things with the GDT/IDT */
490 WinLdrSetupForNt(LoaderBlock
, &GdtIdt
, &PcrBasePage
, &TssBasePage
);
492 /* Save entry-point pointer and Loader block VAs */
493 KiSystemStartup
= (KERNEL_ENTRY_POINT
)KernelDTE
->EntryPoint
;
494 LoaderBlockVA
= PaToVa(LoaderBlock
);
496 /* "Stop all motors", change videomode */
497 DiskStopFloppyMotor();
498 if (OperatingSystemVersion
< _WIN32_WINNT_WIN2K
)
499 MachVideoPrepareForReactOS(TRUE
);
501 MachVideoPrepareForReactOS(FALSE
);
504 //DumpMemoryAllocMap();
506 /* Turn on paging mode of CPU*/
507 WinLdrTurnOnPaging(LoaderBlock
, PcrBasePage
, TssBasePage
, GdtIdt
);
509 DbgPrint((DPRINT_WINDOWS
, "Hello from paged mode, KiSystemStartup %p, LoaderBlockVA %p!\n",
510 KiSystemStartup
, LoaderBlockVA
));
512 WinLdrpDumpMemoryDescriptors(LoaderBlockVA
);
513 WinLdrpDumpBootDriver(LoaderBlockVA
);
514 WinLdrpDumpArcDisks(LoaderBlockVA
);
516 //FIXME: If I substitute this debugging checkpoint, GCC will "optimize away" the code below
518 /*asm(".intel_syntax noprefix\n");
521 asm(".att_syntax\n");*/
524 (*KiSystemStartup
)(LoaderBlockVA
);
530 WinLdrpDumpMemoryDescriptors(PLOADER_PARAMETER_BLOCK LoaderBlock
)
533 PMEMORY_ALLOCATION_DESCRIPTOR MemoryDescriptor
;
535 NextMd
= LoaderBlock
->MemoryDescriptorListHead
.Flink
;
537 while (NextMd
!= &LoaderBlock
->MemoryDescriptorListHead
)
539 MemoryDescriptor
= CONTAINING_RECORD(NextMd
, MEMORY_ALLOCATION_DESCRIPTOR
, ListEntry
);
541 DbgPrint((DPRINT_WINDOWS
, "BP %08X PC %04X MT %d\n", MemoryDescriptor
->BasePage
,
542 MemoryDescriptor
->PageCount
, MemoryDescriptor
->MemoryType
));
544 NextMd
= MemoryDescriptor
->ListEntry
.Flink
;
549 WinLdrpDumpBootDriver(PLOADER_PARAMETER_BLOCK LoaderBlock
)
552 PBOOT_DRIVER_LIST_ENTRY BootDriver
;
554 NextBd
= LoaderBlock
->BootDriverListHead
.Flink
;
556 while (NextBd
!= &LoaderBlock
->BootDriverListHead
)
558 BootDriver
= CONTAINING_RECORD(NextBd
, BOOT_DRIVER_LIST_ENTRY
, ListEntry
);
560 DbgPrint((DPRINT_WINDOWS
, "BootDriver %wZ DTE %08X RegPath: %wZ\n", &BootDriver
->FilePath
,
561 BootDriver
->DataTableEntry
, &BootDriver
->RegistryPath
));
563 NextBd
= BootDriver
->ListEntry
.Flink
;
568 WinLdrpDumpArcDisks(PLOADER_PARAMETER_BLOCK LoaderBlock
)
571 PARC_DISK_SIGNATURE ArcDisk
;
573 NextBd
= LoaderBlock
->ArcDiskInformation
->DiskSignatureListHead
.Flink
;
575 while (NextBd
!= &LoaderBlock
->ArcDiskInformation
->DiskSignatureListHead
)
577 ArcDisk
= CONTAINING_RECORD(NextBd
, ARC_DISK_SIGNATURE
, ListEntry
);
579 DbgPrint((DPRINT_WINDOWS
, "ArcDisk %s checksum: 0x%X, signature: 0x%X\n",
580 ArcDisk
->ArcName
, ArcDisk
->CheckSum
, ArcDisk
->Signature
));
582 NextBd
= ArcDisk
->ListEntry
.Flink
;