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windows-nt/Source/XPSP1/NT/base/boot/lib/i386/entry.c

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/*++
Copyright (c) 1992 Microsoft Corporation
Module Name:
entry.c
Abstract:
x86-specific startup for setupldr
Author:
John Vert (jvert) 14-Oct-1993
Revision History:
--*/
#include "bootx86.h"
#include "stdio.h"
#include "flop.h"
#include <ramdisk.h>
#if 0
#define DBGOUT(x) BlPrint x
#define DBGPAUSE while(!GET_KEY());
#else
#define DBGOUT(x)
#define DBGPAUSE
#endif
//
// Prototypes for Internal Routines
//
VOID
DoGlobalInitialization(
PBOOT_CONTEXT
);
#if defined(ELTORITO)
BOOLEAN ElToritoCDBoot = FALSE;
#endif
extern CHAR NetBootPath[];
//
// Global context pointers. These are passed to us by the SU module or
// the bootstrap code.
//
PCONFIGURATION_COMPONENT_DATA FwConfigurationTree = NULL;
PEXTERNAL_SERVICES_TABLE ExternalServicesTable;
UCHAR BootPartitionName[80];
ULONG MachineType = 0;
ULONG OsLoaderBase;
ULONG OsLoaderExports;
extern PUCHAR BlpResourceDirectory;
extern PUCHAR BlpResourceFileOffset;
ULONG PcrBasePage;
ULONG TssBasePage;
ULONG BootFlags = 0;
ULONG NtDetectStart = 0;
ULONG NtDetectEnd = 0;
#ifdef FORCE_CD_BOOT
BOOLEAN
BlGetCdRomDrive(
PUCHAR DriveId
)
{
BOOLEAN Result = FALSE;
UCHAR Id = 0;
do {
if (BlIsElToritoCDBoot(Id)) {
*DriveId = Id;
Result = TRUE;
break;
}
Id++;
}
while (Id != 0);
return Result;
}
#endif
VOID
NtProcessStartup(
IN PBOOT_CONTEXT BootContextRecord
)
/*++
Routine Description:
Main entry point for setup loader. Control is transferred here by the
start-up (SU) module.
Arguments:
BootContextRecord - Supplies the boot context, particularly the
ExternalServicesTable.
Returns:
Does not return. Control eventually passed to the kernel.
--*/
{
ARC_STATUS Status;
#ifdef FORCE_CD_BOOT
BOOLEAN CdFound;
UCHAR CdId;
#endif
ULONG_PTR pFirmwareHeapAddress;
ULONG TssSize,TssPages;
//
// Initialize the boot loader's video
//
DoGlobalInitialization(BootContextRecord);
BlFillInSystemParameters(BootContextRecord);
//
// Set the global bootflags
//
BootFlags = BootContextRecord->BootFlags;
#ifdef FORCE_CD_BOOT
CdFound = BlGetCdRomDrive(&CdId);
if (CdFound) {
BlPrint("CD/DVD-Rom drive found with id:%u\n", CdId);
BootContextRecord->FSContextPointer->BootDrive = CdId;
} else {
BlPrint("CD/DVD-Rom drive not found");
}
#endif // for FORCE_CD_BOOT
if (BootContextRecord->FSContextPointer->BootDrive == 0) {
//
// Boot was from A:
//
strcpy(BootPartitionName,"multi(0)disk(0)fdisk(0)");
//
// To get around an apparent bug on the BIOS of some MCA machines
// (specifically the NCR 386sx/MC20 w/ BIOS version 1.04.00 (3421),
// Phoenix BIOS 1.02.07), whereby the first int13 to floppy results
// in a garbage buffer, reset drive 0 here.
//
GET_SECTOR(0,0,0,0,0,0,NULL);
} else if (BootContextRecord->FSContextPointer->BootDrive == 0x40) {
//
// Boot was from the net
//
strcpy(BootPartitionName,"net(0)");
BlBootingFromNet = TRUE;
#if defined(REMOTE_BOOT)
BlGetActivePartition(NetBootActivePartitionName);
NetFindCSCPartitionName();
#endif
} else if (BootContextRecord->FSContextPointer->BootDrive == 0x41) {
//
// Boot was from an SDI image
//
strcpy(BootPartitionName,"ramdisk(0)");
} else if (BlIsElToritoCDBoot(BootContextRecord->FSContextPointer->BootDrive)) {
//
// Boot was from El Torito CD
//
sprintf(BootPartitionName, "multi(0)disk(0)cdrom(%u)", BootContextRecord->FSContextPointer->BootDrive);
ElToritoCDBoot = TRUE;
} else {
//
// Find the partition we have been booted from. Note that this
// is *NOT* necessarily the active partition. If the system has
// Boot Mangler installed, it will be the active partition, and
// we have to go figure out what partition we are actually on.
//
BlGetActivePartition(BootPartitionName);
#if defined(REMOTE_BOOT)
strcpy(NetBootActivePartitionName, BootPartitionName);
NetFindCSCPartitionName();
#endif
}
//
// We need to make sure that we've got a signature on disk 80.
// If not, then write one.
//
{
ULONG DriveId;
ULONG NewSignature;
UCHAR SectorBuffer[4096+256];
PUCHAR Sector;
LARGE_INTEGER SeekValue;
ULONG Count;
Status = ArcOpen("multi(0)disk(0)rdisk(0)partition(0)", ArcOpenReadWrite, &DriveId);
if (Status == ESUCCESS) {
//
// Get a reasonably unique seed to start with.
//
NewSignature = ArcGetRelativeTime();
NewSignature = (NewSignature & 0xFFFF) << 16;
NewSignature += ArcGetRelativeTime();
//
// Now we have a valid new signature to put on the disk.
// Read the sector off disk, put the new signature in,
// write the sector back, and recompute the checksum.
//
Sector = ALIGN_BUFFER(SectorBuffer);
SeekValue.QuadPart = 0;
Status = ArcSeek(DriveId, &SeekValue, SeekAbsolute);
if (Status == ESUCCESS) {
Status = ArcRead(DriveId,Sector,512,&Count);
if( Status == ESUCCESS ) {
if( ((PULONG)Sector)[PARTITION_TABLE_OFFSET/2-1] == 0 ) {
//
// He's 0. Write a real signature in there.
//
((PULONG)Sector)[PARTITION_TABLE_OFFSET/2-1] = NewSignature;
Status = ArcSeek(DriveId, &SeekValue, SeekAbsolute);
if (Status == ESUCCESS) {
Status = ArcWrite(DriveId,Sector,512,&Count);
if( Status != ESUCCESS ) {
#if DBG
BlPrint( "Falied to write the new signature on the boot partition.\n" );
#endif
}
} else {
#if DBG
BlPrint( "Failed second ArcSeek on the boot partition to check for a signature.\n" );
#endif
}
}
} else {
#if DBG
BlPrint( "Failed to ArcRead the boot partition to check for a signature.\n" );
#endif
}
} else {
#if DBG
BlPrint( "Failed to ArcSeek the boot partition to check for a signature.\n" );
#endif
}
ArcClose(DriveId);
} else {
#if DBG
BlPrint( "Couldn't Open the boot partition to check for a signature.\n" );
#endif
}
}
//
// squirrel away some memory for the PCR and TSS so that we get the
// preferred memory location (<16MB) for this data.
//
pFirmwareHeapAddress = (ULONG_PTR)FwAllocateHeapPermanent( 2 );
if (!pFirmwareHeapAddress) {
BlPrint("Couldn't allocate memory for PCR\n");
goto BootFailed;
}
PcrBasePage = (ULONG)(pFirmwareHeapAddress>>PAGE_SHIFT);
TssSize = (sizeof(KTSS) + PAGE_SIZE) & ~(PAGE_SIZE - 1);
TssPages = TssSize / PAGE_SIZE;
pFirmwareHeapAddress = (ULONG_PTR)FwAllocateHeapPermanent( TssPages );
if (!pFirmwareHeapAddress) {
BlPrint("Couldn't allocate memory for TSS\n");
goto BootFailed;
}
TssBasePage = (ULONG)(pFirmwareHeapAddress>>PAGE_SHIFT);
//
// Initialize the memory descriptor list, the OS loader heap, and the
// OS loader parameter block.
//
Status = BlMemoryInitialize();
if (Status != ESUCCESS) {
BlPrint("Couldn't initialize memory\n");
goto BootFailed;
}
//
// Initialize the OS loader I/O system.
//
AEInitializeStall();
Status = BlIoInitialize();
if (Status != ESUCCESS) {
BlPrint("Couldn't initialize I/O\n");
goto BootFailed;
}
//
// Call off to regular startup code
//
BlStartup(BootPartitionName);
//
// we should never get here!
//
BootFailed:
if (BootFlags & BOOTFLAG_REBOOT_ON_FAILURE) {
ULONG StartTime = ArcGetRelativeTime();
BlPrint(TEXT("\nRebooting in 5 seconds...\n"));
while ( ArcGetRelativeTime() - StartTime < 5) {}
ArcRestart();
}
do {
GET_KEY(); // BOOT FAILED!
if (BlTerminalHandleLoaderFailure()) {
ArcRestart();
}
} while ( 1 );
}
BOOLEAN
BlDetectHardware(
IN ULONG DriveId,
IN PCHAR LoadOptions
)
/*++
Routine Description:
Loads and runs NTDETECT.COM to populate the ARC configuration tree.
Arguments:
DriveId - Supplies drive id where NTDETECT is located.
LoadOptions - Supplies Load Options string to ntdetect.
Return Value:
TRUE - NTDETECT successfully run.
FALSE - Error
--*/
{
// Current Loader stack size is 8K, so make sure you do not
// blow that space. Make sure this is not smaller than 140.
#define LOAD_OPTIONS_BUFFER_SIZE 512
ARC_STATUS Status;
PCONFIGURATION_COMPONENT_DATA TempFwTree;
ULONG TempFwHeapUsed;
ULONG FileSize;
ULONG DetectFileId;
FILE_INFORMATION FileInformation;
PUCHAR DetectionBuffer = (PUCHAR)DETECTION_LOADED_ADDRESS;
PUCHAR Options = NULL;
UCHAR Buffer[LOAD_OPTIONS_BUFFER_SIZE];
LARGE_INTEGER SeekPosition;
ULONG Read;
BOOLEAN SkipLegacyDetection;
BOOLEAN Success = FALSE;
ULONG HeapStart;
ULONG HeapSize;
ULONG RequiredLength = 0;
//
// Check if the ntdetect.com was bundled as a data section
// in the loader executable.
//
if (NtDetectStart == 0) {
//
// Now check if we have ntdetect.com in the root directory, if yes,
// we will load it to predefined location and transfer control to
// it.
//
#if defined(ELTORITO)
if (ElToritoCDBoot) {
// we assume ntdetect.com is in the i386 directory
Status = BlOpen( DriveId,
"\\i386\\ntdetect.com",
ArcOpenReadOnly,
&DetectFileId );
} else {
#endif
if (BlBootingFromNet
#if defined(REMOTE_BOOT)
&& NetworkBootRom
#endif // defined(REMOTE_BOOT)
) {
strcpy(Buffer, NetBootPath);
#if defined(REMOTE_BOOT)
//
// This is the way it was done for remote BOOT, where we were
// booting out of a client's machine directory.
//
strcat(Buffer, "BootDrive\\ntdetect.com");
#else
//
// This is how it is done for remote INSTALL, where we are
// booting out of the templates directory under a setup directory.
//
strcat(Buffer, "ntdetect.com");
#endif // defined(REMOTE_BOOT)
Status = BlOpen( DriveId,
Buffer,
ArcOpenReadOnly,
&DetectFileId );
} else {
Status = BlOpen( DriveId,
"\\ntdetect.com",
ArcOpenReadOnly,
&DetectFileId );
}
#if defined(ELTORITO)
}
#endif
if (Status != ESUCCESS) {
#if DBG
BlPrint("Error opening NTDETECT.COM, status = %x\n", Status);
BlPrint("Press any key to continue\n");
#endif
goto Exit;
}
//
// Determine the length of the ntdetect.com file
//
Status = BlGetFileInformation(DetectFileId, &FileInformation);
if (Status != ESUCCESS) {
BlClose(DetectFileId);
#if DBG
BlPrint("Error getting NTDETECT.COM file information, status = %x\n", Status);
BlPrint("Press any key to continue\n");
#endif
goto Exit;
}
FileSize = FileInformation.EndingAddress.LowPart;
if (FileSize == 0) {
BlClose(DetectFileId);
#if DBG
BlPrint("Error: size of NTDETECT.COM is zero.\n");
BlPrint("Press any key to continue\n");
#endif
goto Exit;
}
SeekPosition.QuadPart = 0;
Status = BlSeek(DetectFileId,
&SeekPosition,
SeekAbsolute);
if (Status != ESUCCESS) {
BlClose(DetectFileId);
#if DBG
BlPrint("Error seeking to start of NTDETECT.COM file\n");
BlPrint("Press any key to continue\n");
#endif
goto Exit;
}
Status = BlRead( DetectFileId,
DetectionBuffer,
FileSize,
&Read );
BlClose(DetectFileId);
if (Status != ESUCCESS) {
#if DBG
BlPrint("Error reading from NTDETECT.COM\n");
BlPrint("Read %lx bytes\n",Read);
BlPrint("Press any key to continue\n");
#endif
goto Exit;
}
} else {
// ntdetect.com was bundled in the loader image
// as a data section. We will use it contents
// instead of opening the file.
RtlCopyMemory( DetectionBuffer, (PVOID)NtDetectStart, NtDetectEnd - NtDetectStart );
}
//
// Set the heap start and size used by ntdetect
//
HeapStart = (TEMPORARY_HEAP_START - 0x10) * PAGE_SIZE;
HeapSize = 0x10000; // 64K
//
// We need to pass NTDETECT pointers < 1Mb, so
// use local storage off the stack if possible. (which is
// always < 1Mb.) If not possible (boot.ini is too big)
// and we will add it to the heap used by ntdetect.com, thereby
// reducing the heap space used by ntdetect.com
//
if ( LoadOptions ) {
// count the characters in LoadOptions + null terminator +
// room for " NOLEGACY" that might be appended later
RequiredLength = strlen(LoadOptions) + strlen(" NOLEGACY") + 1;
// check if the buffer on the stack is big enough
if ( RequiredLength > LOAD_OPTIONS_BUFFER_SIZE ) {
//
// Buffer is too small. let move it to the
// end of the ntdetect heap
//
Options = (PCHAR)( HeapStart + HeapSize - RequiredLength );
HeapSize -= RequiredLength;
strcpy( Options, LoadOptions );
} else {
//
// Load options will fit on the stack. copy them there
//
strcpy( Buffer, LoadOptions );
Options = Buffer;
}
} else {
//
// No load options
//
Options = NULL;
}
//
// Check whether we need to add the NOLEGACY option
//
if (BlDetectLegacyFreeBios()) {
if (Options != NULL) {
strcat(Options, " NOLEGACY");
} else {
strcpy(Buffer, " NOLEGACY");
Options = Buffer;
}
}
DETECT_HARDWARE((ULONG)HeapStart,
(ULONG)HeapSize,
(PVOID)&TempFwTree,
(PULONG)&TempFwHeapUsed,
(PCHAR)Options,
(Options != NULL) ? strlen(Options) : 0
);
FwConfigurationTree = TempFwTree;
Status = BlpMarkExtendedVideoRegionOffLimits();
Success = (BOOLEAN)(Status == ESUCCESS);
Exit:
//
// Reinitialize the headless port - detect wipes it out.
//
BlInitializeHeadlessPort();
return(Success);
}
VOID
DoGlobalInitialization(
IN PBOOT_CONTEXT BootContextRecord
)
/*++
Routine Description
This routine calls all of the subsytem initialization routines.
Arguments:
None
Returns:
Nothing
--*/
{
ARC_STATUS Status;
//
// Set base address of OS Loader image for the debugger.
//
OsLoaderBase = BootContextRecord->OsLoaderBase;
OsLoaderExports = BootContextRecord->OsLoaderExports;
//
// Initialize memory.
//
Status = InitializeMemorySubsystem(BootContextRecord);
if (Status != ESUCCESS) {
BlPrint("InitializeMemory failed %lx\n",Status);
while (1) {
}
}
ExternalServicesTable=BootContextRecord->ExternalServicesTable;
MachineType = BootContextRecord->MachineType;
//
// Turn the cursor off
//
HW_CURSOR(0,127);
BlpResourceDirectory = (PUCHAR)(BootContextRecord->ResourceDirectory);
BlpResourceFileOffset = (PUCHAR)(BootContextRecord->ResourceOffset);
NtDetectStart = BootContextRecord->NtDetectStart;
NtDetectEnd = BootContextRecord->NtDetectEnd;
//
// If this is an SDI boot, copy the address of the SDI image out of the
// boot context record. SdiAddress is declared in boot\inc\ramdisk.h and
// initialized to 0 in boot\lib\ramdisk.c.
//
if (BootContextRecord->FSContextPointer->BootDrive == 0x41) {
SdiAddress = BootContextRecord->SdiAddress;
}
InitializeMemoryDescriptors ();
}
VOID
BlGetActivePartition(
OUT PUCHAR BootPartitionName
)
/*++
Routine Description:
Determine the ARC name for the partition NTLDR was started from
Arguments:
BootPartitionName - Supplies a buffer where the ARC name of the
partition will be returned.
Return Value:
Name of the partition is in BootPartitionName.
Must always succeed.
--*/
{
UCHAR SectorBuffer[512];
ARC_STATUS Status;
ULONG FileId;
ULONG Count;
int i;
//
// The boot sector used to boot us is still in memory at 0x7c00.
// The hidden sectors field in the BPB is pretty much guaranteed
// to be intact, since all boot codes use that field and thus
// are unlikely to have overwritten it.
// We open each partition and compare the in-memory hidden sector count
// at 0x7c1c to the hidden sector value in the BPB.
//
i = 1;
do {
sprintf(BootPartitionName,"multi(0)disk(0)rdisk(0)partition(%u)",i);
Status = ArcOpen(BootPartitionName,ArcOpenReadOnly,&FileId);
if(Status == ESUCCESS) {
//
// Read the first part of the partition.
//
Status = ArcRead(FileId,SectorBuffer,512,&Count);
ArcClose(FileId);
if((Status == ESUCCESS) && !memcmp(SectorBuffer+0x1c,(PVOID)0x7c1c,4)) {
//
// Found it, BootPartitionName is already set for return.
//
return;
}
Status = ESUCCESS;
}
i++;
} while (Status == ESUCCESS);
//
// Run out of partitions without finding match. Fall back on partition 1.
//
strcpy(BootPartitionName,"multi(0)disk(0)rdisk(0)partition(1)");
}
BOOLEAN
BlIsElToritoCDBoot(
UCHAR DriveNum
)
{
//
// Note, even though args are short, they are pushed on the stack with
// 32bit alignment so the effect on the stack seen by the 16bit real
// mode code is the same as if we were pushing longs here.
//
// GET_ELTORITO_STATUS is 0 if we are in emulation mode
if (DriveNum > 0x81) {
if (!GET_ELTORITO_STATUS(FwDiskCache,DriveNum)) {
return(TRUE);
} else {
return(FALSE);
}
} else {
return(FALSE);
}
}
#if defined(REMOTE_BOOT)
BOOLEAN
NetFindCSCPartitionName(
)
{
UCHAR FileName[80];
UCHAR DiskName[80];
UCHAR PartitionName[80];
PUCHAR p;
ULONG Part;
ULONG FileId;
ULONG DeviceId;
if (NetBootSearchedForCSC) {
return((BOOLEAN)strlen(NetBootCSCPartitionName));
}
if (!strlen(NetBootActivePartitionName)) {
BlGetActivePartition(NetBootActivePartitionName);
}
strcpy(DiskName, NetBootActivePartitionName);
p = strstr(DiskName, "partition");
ASSERT( p != NULL );
*p = '\0';
Part = 1;
while (TRUE) {
sprintf(PartitionName, "%spartition(%u)", DiskName, Part);
if (ArcOpen(PartitionName, ArcOpenReadOnly, &DeviceId) != ESUCCESS) {
break;
}
ArcClose(DeviceId);
sprintf(FileName,
"%s%s",
PartitionName,
REMOTE_BOOT_IMIRROR_PATH_A REMOTE_BOOT_CSC_SUBDIR_A);
if (ArcOpen(FileName, ArcOpenReadOnly, &FileId) == ESUCCESS) {
ArcClose(FileId);
NetBootSearchedForCSC = TRUE;
strcpy(NetBootCSCPartitionName, PartitionName);
return TRUE;
}
ArcClose(FileId);
Part++;
}
strcpy(NetBootCSCPartitionName, NetBootActivePartitionName);
return FALSE;
}
#endif // defined(REMOTE_BOOT)
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