Source to boot/windows/bootconfig.cpp


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/*
 Copyright (c) 2008-2012 TrueCrypt Developers Association. All rights reserved.

 Governed by the TrueCrypt License 3.0 the full text of which is contained in
 the file License.txt included in TrueCrypt binary and source code distribution
 packages.
*/

#include "BootConfig.h"

byte BootSectorFlags;

byte BootLoaderDrive;
byte BootDrive;
bool BootDriveGeometryValid = false;
bool PreventNormalSystemBoot = false;
bool PreventBootMenu = false;
char CustomUserMessage[TC_BOOT_SECTOR_USER_MESSAGE_MAX_LENGTH + 1];
uint32 OuterVolumeBackupHeaderCrc;

bool BootStarted = false;

DriveGeometry BootDriveGeometry;

CRYPTO_INFO *BootCryptoInfo;
Partition EncryptedVirtualPartition;

Partition ActivePartition;
Partition PartitionFollowingActive;
bool ExtraBootPartitionPresent = false;
uint64 HiddenVolumeStartUnitNo;
uint64 HiddenVolumeStartSector;

#ifndef TC_WINDOWS_BOOT_RESCUE_DISK_MODE

void ReadBootSectorUserConfiguration ()
{
	byte userConfig;

	AcquireSectorBuffer();

	if (ReadWriteMBR (false, BootLoaderDrive, true) != BiosResultSuccess)
		goto ret;

	userConfig = SectorBuffer[TC_BOOT_SECTOR_USER_CONFIG_OFFSET];

#ifdef TC_WINDOWS_BOOT_AES
	EnableHwEncryption (!(userConfig & TC_BOOT_USER_CFG_FLAG_DISABLE_HW_ENCRYPTION));
#endif

	PreventBootMenu = (userConfig & TC_BOOT_USER_CFG_FLAG_DISABLE_ESC);

	memcpy (CustomUserMessage, SectorBuffer + TC_BOOT_SECTOR_USER_MESSAGE_OFFSET, TC_BOOT_SECTOR_USER_MESSAGE_MAX_LENGTH);
	CustomUserMessage[TC_BOOT_SECTOR_USER_MESSAGE_MAX_LENGTH] = 0;

	if (userConfig & TC_BOOT_USER_CFG_FLAG_SILENT_MODE)
	{
		if (CustomUserMessage[0])
		{
			InitVideoMode();
			Print (CustomUserMessage);
		}

		DisableScreenOutput();
	}

	OuterVolumeBackupHeaderCrc = *(uint32 *) (SectorBuffer + TC_BOOT_SECTOR_OUTER_VOLUME_BAK_HEADER_CRC_OFFSET);

ret:
	ReleaseSectorBuffer();
}


BiosResult UpdateBootSectorConfiguration (byte drive)
{
	AcquireSectorBuffer();

	BiosResult result = ReadWriteMBR (false, drive);
	if (result != BiosResultSuccess)
		goto ret;

	SectorBuffer[TC_BOOT_SECTOR_CONFIG_OFFSET] = BootSectorFlags;
	result = ReadWriteMBR (true, drive);

ret:
	ReleaseSectorBuffer();
	return result;
}

#endif // !TC_WINDOWS_BOOT_RESCUE_DISK_MODE