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694 lines
15 KiB
694 lines
15 KiB
/*++
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Copyright (c) 1998 Microsoft Corporation
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Module Name:
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mbr.c
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Abstract:
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This module implements the FIXMBR command.
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Author:
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Wesley Witt (wesw) 21-Oct-1998
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Revision History:
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--*/
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#include "cmdcons.h"
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#pragma hdrstop
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#include <bootmbr.h>
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//
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// For NEC98 boot memu code.
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//
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#include <x86mboot.h>
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VOID
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RcDetermineDisk0(
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VOID
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);
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BOOL
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RcDetermineDisk0Enum(
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IN PPARTITIONED_DISK Disk,
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IN PDISK_REGION Region,
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IN ULONG_PTR Context
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);
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NTSTATUS
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RcOpenPartition(
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IN PWSTR DiskDevicePath,
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IN ULONG PartitionNumber,
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OUT HANDLE *Handle,
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IN BOOLEAN NeedWriteAccess
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);
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NTSTATUS
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RcReadDiskSectors(
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IN HANDLE Handle,
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IN ULONG SectorNumber,
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IN ULONG SectorCount,
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IN ULONG BytesPerSector,
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IN OUT PVOID AlignedBuffer
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);
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NTSTATUS
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RcWriteDiskSectors(
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IN HANDLE Handle,
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IN ULONG SectorNumber,
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IN ULONG SectorCount,
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IN ULONG BytesPerSector,
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IN OUT PVOID AlignedBuffer
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);
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#define MBRSIZE_NEC98 0x2000
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#define IPL_SIGNATURE_NEC98 "IPL1"
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ULONG
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RcCmdFixMBR(
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IN PTOKENIZED_LINE TokenizedLine
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)
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/*++
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Routine Description:
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Top-level routine supporting the FIXMBR command in the setup diagnostic
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command interpreter.
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FIXMBR writes a new master boot record. It will ask before writing the boot
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record if it cannot detect a valid mbr signature.
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Arguments:
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TokenizedLine - supplies structure built by the line parser describing
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each string on the line as typed by the user.
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Return Value:
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None.
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--*/
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{
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WCHAR DeviceName[256];
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ULONG i;
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ULONG SectorCount;
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ULONG BytesPerSector;
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PUCHAR Buffer = NULL;
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UCHAR InfoBuffer[2048];
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ULONG SectorId = 0;
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HANDLE handle = 0;
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NTSTATUS rc;
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PON_DISK_MBR mbr;
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IO_STATUS_BLOCK StatusBlock;
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Int13HookerType Int13Hooker = NoHooker;
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ULONG NextSector;
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WCHAR Text[2];
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PWSTR YesNo = NULL;
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BOOL Confirm = TRUE;
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BOOL SignatureInvalid = FALSE;
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BOOL Int13Detected = FALSE;
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PREAL_DISK_MBR_NEC98 MbrNec98;
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//
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// command is only supported on X86 platforms.
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// Alpha or other RISC platforms don't use
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// mbr code
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//
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#ifndef _X86_
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RcMessageOut( MSG_ONLY_ON_X86 );
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return 1;
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#else
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if (RcCmdParseHelp( TokenizedLine, MSG_FIXMBR_HELP )) {
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return 1;
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}
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if (TokenizedLine->TokenCount == 2) {
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wcscpy( DeviceName, TokenizedLine->Tokens->Next->String );
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} else {
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RtlZeroMemory(DeviceName,sizeof(DeviceName));
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SpEnumerateDiskRegions( (PSPENUMERATEDISKREGIONS)RcDetermineDisk0Enum, (ULONG_PTR)DeviceName );
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}
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rc = RcOpenPartition( DeviceName, 0, &handle, TRUE );
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if (!NT_SUCCESS(rc)) {
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DEBUG_PRINTF(( "failed to open partition zero!!!!!!" ));
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return 1;
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}
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//
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// get disk geometry
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//
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rc = ZwDeviceIoControlFile(
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handle,
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NULL,
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NULL,
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NULL,
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&StatusBlock,
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IOCTL_DISK_GET_DRIVE_GEOMETRY,
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NULL,
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0,
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InfoBuffer,
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sizeof( InfoBuffer )
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);
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if( !NT_SUCCESS( rc ) ) {
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RcMessageOut( MSG_FIXMBR_READ_ERROR );
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goto cleanup;
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}
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//
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// retrieve the sector size!
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//
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BytesPerSector = ((DISK_GEOMETRY*)InfoBuffer)->BytesPerSector;
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//
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// compute the sector count
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//
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SectorCount = max( 1, (!IsNEC_98
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? (sizeof( ON_DISK_MBR )/BytesPerSector)
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: (MBRSIZE_NEC98/BytesPerSector) ));
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//
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// allocate a buffer twice as big as necessary
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//
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Buffer = SpMemAlloc( 2 * SectorCount * BytesPerSector );
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//
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// align the buffer
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//
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if(!IsNEC_98) {
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mbr = ALIGN( Buffer, BytesPerSector );
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} else {
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MbrNec98 = ALIGN( Buffer, BytesPerSector );
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}
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//
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// take in the sectors
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//
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rc = RcReadDiskSectors(
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handle,
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SectorId,
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SectorCount,
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BytesPerSector,
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(!IsNEC_98 ? (PVOID)mbr : (PVOID)MbrNec98)
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);
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if (!NT_SUCCESS(rc)) {
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RcMessageOut( MSG_FIXMBR_READ_ERROR );
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goto cleanup;
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}
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if ((!IsNEC_98 && U_USHORT(mbr->AA55Signature) != MBR_SIGNATURE) ||
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(IsNEC_98 &&
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((U_USHORT(MbrNec98->AA55Signature) != MBR_SIGNATURE) ||
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_strnicmp(MbrNec98->IPLSignature,IPL_SIGNATURE_NEC98,sizeof(IPL_SIGNATURE_NEC98)-1)))
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) {
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SignatureInvalid = TRUE;
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RcMessageOut( MSG_FIXMBR_NO_VALID_SIGNATURE );
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}
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//
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// check for weird int13 hookers
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//
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// No NEC98 supports EZ Drive.
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//
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//
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if (!IsNEC_98) {
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//
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//
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// EZDrive support: if the first entry in the partition table is
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// type 0x55, then the actual partition table is on sector 1.
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//
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// Only for x86 because on non-x86, the firmware can't see EZDrive
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// partitions.
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//
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//
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if (mbr->PartitionTable[0].SystemId == 0x55) {
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Int13Hooker = HookerEZDrive;
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SectorId = 1;
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}
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//
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// Also check for on-track.
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//
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if( mbr->PartitionTable[0].SystemId == 0x54 ) {
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Int13Hooker = HookerOnTrackDiskManager;
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SectorId = 1;
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}
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//
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// there's a define for HookerMax but we don't appear
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// to check for it in setup so I don't check for it here
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//
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//
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// If we have an int13 hooker
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//
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if (Int13Hooker != NoHooker) {
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Int13Detected = TRUE;
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RcMessageOut( MSG_FIXMBR_INT13_HOOKER );
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}
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//
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// we have a valid signature AND int 13 hooker is detected
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//
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if (Int13Detected) {
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//
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// take sector 1 in, since sector 0 is the int hooker boot code
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//
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rc = RcReadDiskSectors(
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handle,
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SectorId,
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SectorCount,
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BytesPerSector,
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mbr
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);
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//
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// sector 1 should look like a valid MBR too
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//
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if (U_USHORT(mbr->AA55Signature) != MBR_SIGNATURE) {
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SignatureInvalid = TRUE;
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RcMessageOut( MSG_FIXMBR_NO_VALID_SIGNATURE );
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}
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}
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}
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RcMessageOut( MSG_FIXMBR_WARNING_BEFORE_PROCEED );
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if (!InBatchMode) {
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YesNo = SpRetreiveMessageText(ImageBase,MSG_YESNO,NULL,0);
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if(!YesNo) {
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Confirm = FALSE;
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}
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while(Confirm) {
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RcMessageOut( MSG_FIXMBR_ARE_YOU_SURE );
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if(RcLineIn(Text,2)) {
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if((Text[0] == YesNo[0]) || (Text[0] == YesNo[1])) {
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//
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// Wants to do it.
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//
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Confirm = FALSE;
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} else {
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if((Text[0] == YesNo[2]) || (Text[0] == YesNo[3])) {
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//
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// Doesn't want to do it.
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//
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goto cleanup;
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}
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}
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}
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}
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}
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//
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// now we need to slap in new boot code!
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// make sure the boot code starts at the start of the sector.
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//
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if(!IsNEC_98) {
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ASSERT(&((PON_DISK_MBR)0)->BootCode == 0);
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} else {
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ASSERT(&((PREAL_DISK_MBR_NEC98)0)->BootCode == 0);
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}
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RcMessageOut( MSG_FIXMBR_DOING_IT, DeviceName );
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//
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// clobber the existing boot code
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//
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if(!IsNEC_98) {
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RtlMoveMemory(mbr,x86BootCode,sizeof(mbr->BootCode));
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//
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// put a new signature in
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//
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U_USHORT(mbr->AA55Signature) = MBR_SIGNATURE;
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} else {
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//
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// Write MBR in 1st sector.
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//
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RtlMoveMemory(MbrNec98,x86PC98BootCode,0x200);
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//
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// Write continous MBR after 3rd sector.
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//
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RtlMoveMemory((PUCHAR)MbrNec98+0x400,x86PC98BootMenu,MBRSIZE_NEC98-0x400);
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}
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//
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// write out the sector
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//
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rc = RcWriteDiskSectors(
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handle,
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SectorId,
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SectorCount,
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BytesPerSector,
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(!IsNEC_98 ? (PVOID)mbr : (PVOID)MbrNec98)
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);
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if (!NT_SUCCESS( rc )) {
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DEBUG_PRINTF(( "failed writing out new MBR." ));
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RcMessageOut( MSG_FIXMBR_FAILED );
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goto cleanup;
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}
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RcMessageOut( MSG_FIXMBR_DONE );
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cleanup:
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if (handle) {
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NtClose(handle);
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}
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if (Buffer) {
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SpMemFree(Buffer);
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}
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if (YesNo) {
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SpMemFree(YesNo);
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}
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return 1;
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#endif
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}
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BOOL
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RcDetermineDisk0Enum(
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IN PPARTITIONED_DISK Disk,
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IN PDISK_REGION Region,
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IN ULONG_PTR Context
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)
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/*++
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Routine Description:
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Callback routine passed to SpEnumDiskRegions.
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Arguments:
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Region - a pointer to a disk region returned by SpEnumDiskRegions
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Ignore - ignored parameter
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Return Value:
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TRUE - to continue enumeration
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FALSE - to end enumeration
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--*/
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{
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WCHAR ArcName[256];
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PWSTR DeviceName = (PWSTR)Context;
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SpArcNameFromRegion(
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Region,
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ArcName,
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sizeof(ArcName),
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PartitionOrdinalCurrent,
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PrimaryArcPath
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);
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//
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// look for the one with arc path L"multi(0)disk(0)rdisk(0)"
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//
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if( wcsstr( ArcName, L"multi(0)disk(0)rdisk(0)" ) ) {
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*DeviceName = UNICODE_NULL;
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SpNtNameFromRegion(
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Region,
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DeviceName,
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MAX_PATH * sizeof(WCHAR),
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PartitionOrdinalCurrent
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);
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if (*DeviceName != UNICODE_NULL) {
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PWSTR PartitionKey = wcsstr(DeviceName, L"Partition");
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if (!PartitionKey) {
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PartitionKey = wcsstr(DeviceName, L"partition");
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}
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//
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// partition 0 represents the start of disk
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//
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if (PartitionKey) {
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*PartitionKey = UNICODE_NULL;
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wcscat(DeviceName, L"Partition0");
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} else {
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DeviceName[wcslen(DeviceName) - 1] = L'0';
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}
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}
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return FALSE;
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}
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return TRUE;
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}
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NTSTATUS
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RcReadDiskSectors(
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IN HANDLE Handle,
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IN ULONG SectorNumber,
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IN ULONG SectorCount,
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IN ULONG BytesPerSector,
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IN OUT PVOID AlignedBuffer
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)
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/*++
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Routine Description:
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Reads one or more disk sectors.
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Arguments:
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Handle - supplies handle to open partition object from which
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sectors are to be read or written. The handle must be
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opened for synchronous I/O.
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Return Value:
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NTSTATUS value indicating outcome of I/O operation.
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--*/
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{
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LARGE_INTEGER IoOffset;
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ULONG IoSize;
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IO_STATUS_BLOCK IoStatusBlock;
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NTSTATUS Status;
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|
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//
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// Calculate the large integer byte offset of the first sector
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// and the size of the I/O.
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//
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IoOffset.QuadPart = SectorNumber * BytesPerSector;
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IoSize = SectorCount * BytesPerSector;
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//
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// Perform the I/O.
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//
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Status = (NTSTATUS) ZwReadFile(
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Handle,
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NULL,
|
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NULL,
|
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NULL,
|
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&IoStatusBlock,
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AlignedBuffer,
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IoSize,
|
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&IoOffset,
|
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NULL
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);
|
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if (!NT_SUCCESS(Status)) {
|
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KdPrint(("SETUP: Unable to read %u sectors starting at sector %u\n",SectorCount,SectorNumber));
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}
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return(Status);
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}
|
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|
|
|
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NTSTATUS
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RcWriteDiskSectors(
|
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IN HANDLE Handle,
|
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IN ULONG SectorNumber,
|
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IN ULONG SectorCount,
|
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IN ULONG BytesPerSector,
|
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IN OUT PVOID AlignedBuffer
|
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)
|
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|
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/*++
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|
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Routine Description:
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Writes one or more disk sectors.
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|
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Arguments:
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|
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Handle - supplies handle to open partition object from which
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sectors are to be read or written. The handle must be
|
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opened for synchronous I/O.
|
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Return Value:
|
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|
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NTSTATUS value indicating outcome of I/O operation.
|
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|
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--*/
|
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|
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{
|
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LARGE_INTEGER IoOffset;
|
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ULONG IoSize;
|
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IO_STATUS_BLOCK IoStatusBlock;
|
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NTSTATUS Status;
|
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|
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//
|
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// Calculate the large integer byte offset of the first sector
|
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// and the size of the I/O.
|
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//
|
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IoOffset.QuadPart = SectorNumber * BytesPerSector;
|
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IoSize = SectorCount * BytesPerSector;
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|
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//
|
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// Perform the I/O.
|
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//
|
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|
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Status = (NTSTATUS) ZwWriteFile(
|
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Handle,
|
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NULL,
|
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NULL,
|
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NULL,
|
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&IoStatusBlock,
|
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AlignedBuffer,
|
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IoSize,
|
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&IoOffset,
|
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NULL
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);
|
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if (!NT_SUCCESS(Status)) {
|
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KdPrint(("SETUP: Unable to write %u sectors starting at sector %u\n",SectorCount,SectorNumber));
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}
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return(Status);
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}
|
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|
|
|
|
NTSTATUS
|
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RcOpenPartition(
|
|
IN PWSTR DiskDevicePath,
|
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IN ULONG PartitionNumber,
|
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OUT HANDLE *Handle,
|
|
IN BOOLEAN NeedWriteAccess
|
|
)
|
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|
|
/*++
|
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|
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Routine Description:
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Opens and returns a handle to the specified partition.
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|
|
Arguments:
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DiskDevicePath - the path to the device.
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|
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PartitionNumber - if the path doesn't already specify the Partition then
|
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the function will open the partition specified by this number
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|
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Handle - where the open handle will be returned.
|
|
The handle is opened for synchronous I/O.
|
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|
|
NeedWriteAccess - true to open in R/W
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|
|
Return Value:
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|
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NTSTATUS value indicating outcome of I/O operation.
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|
|
--*/
|
|
|
|
{
|
|
PWSTR PartitionPath;
|
|
UNICODE_STRING UnicodeString;
|
|
OBJECT_ATTRIBUTES Obja;
|
|
NTSTATUS Status;
|
|
IO_STATUS_BLOCK IoStatusBlock;
|
|
|
|
//
|
|
// Form the pathname of partition.
|
|
//
|
|
|
|
PartitionPath = SpMemAlloc((wcslen(DiskDevicePath) * sizeof(WCHAR)) + sizeof(L"\\partition000"));
|
|
if(PartitionPath == NULL) {
|
|
return STATUS_NO_MEMORY;
|
|
}
|
|
|
|
//
|
|
// if partition is already specified in the string, then don't bother appending
|
|
// it
|
|
//
|
|
|
|
if (wcsstr( DiskDevicePath, L"Partition" ) == 0) {
|
|
swprintf(PartitionPath,L"%ws\\partition%u",DiskDevicePath,PartitionNumber);
|
|
} else {
|
|
swprintf(PartitionPath,L"%ws",DiskDevicePath);
|
|
}
|
|
|
|
//
|
|
// Attempt to open partition0.
|
|
//
|
|
|
|
INIT_OBJA(&Obja,&UnicodeString,PartitionPath);
|
|
|
|
Status = ZwCreateFile(
|
|
Handle,
|
|
FILE_GENERIC_READ | (NeedWriteAccess ? FILE_GENERIC_WRITE : 0),
|
|
&Obja,
|
|
&IoStatusBlock,
|
|
NULL,
|
|
FILE_ATTRIBUTE_NORMAL,
|
|
FILE_SHARE_READ | (NeedWriteAccess ? FILE_SHARE_WRITE : 0),
|
|
FILE_OPEN,
|
|
FILE_SYNCHRONOUS_IO_NONALERT,
|
|
NULL,
|
|
0
|
|
);
|
|
if (!NT_SUCCESS(Status)) {
|
|
KdPrint(("CMDCONS: Unable to open %ws (%lx)\n",PartitionPath,Status));
|
|
}
|
|
|
|
SpMemFree(PartitionPath);
|
|
|
|
return Status;
|
|
}
|