static LONG DiskOpen(CHAR* Path, OPENMODE OpenMode, ULONG* FileId)
{
DISKCONTEXT* Context;
UCHAR DriveNumber;
ULONG DrivePartition, SectorSize;
ULONGLONG SectorOffset = 0;
ULONGLONG SectorCount = 0;
PARTITION_TABLE_ENTRY PartitionTableEntry;
CHAR FileName[1];
if (!DissectArcPath(Path, FileName, &DriveNumber, &DrivePartition))
return EINVAL;
if (DrivePartition == 0xff)
{
/* This is a CD-ROM device */
SectorSize = 2048;
}
else
{
/* This is either a floppy disk device (DrivePartition == 0) or
* a hard disk device (DrivePartition != 0 && DrivePartition != 0xFF) but
* it doesn't matter which one because they both have 512 bytes per sector */
SectorSize = 512;
}
if (DrivePartition != 0xff && DrivePartition != 0)
{
if (!DiskGetPartitionEntry(DriveNumber, DrivePartition, &PartitionTableEntry))
return EINVAL;
SectorOffset = PartitionTableEntry.SectorCountBeforePartition;
SectorCount = PartitionTableEntry.PartitionSectorCount;
}
Context = MmHeapAlloc(sizeof(DISKCONTEXT));
if (!Context)
return ENOMEM;
Context->DriveNumber = DriveNumber;
Context->SectorSize = SectorSize;
Context->SectorOffset = SectorOffset;
Context->SectorCount = SectorCount;
Context->SectorNumber = 0;
FsSetDeviceSpecific(*FileId, Context);
return ESUCCESS;
}
VOID
LoadAndBootPartition(IN OperatingSystemItem* OperatingSystem,
IN USHORT OperatingSystemVersion)
{
ULONG_PTR SectionId;
PCSTR SectionName = OperatingSystem->SystemPartition;
CHAR SettingName[80];
CHAR SettingValue[80];
PARTITION_TABLE_ENTRY PartitionTableEntry;
UCHAR DriveNumber;
ULONG PartitionNumber;
// Find all the message box settings and run them
UiShowMessageBoxesInSection(SectionName);
// Try to open the operating system section in the .ini file
if (!IniOpenSection(SectionName, &SectionId))
{
sprintf(SettingName, "Section [%s] not found in freeldr.ini.\n", SectionName);
UiMessageBox(SettingName);
return;
}
// Read the boot drive
if (!IniReadSettingByName(SectionId, "BootDrive", SettingValue, sizeof(SettingValue)))
{
UiMessageBox("Boot drive not specified for selected OS!");
return;
}
DriveNumber = DriveMapGetBiosDriveNumber(SettingValue);
// Read the boot partition
if (!IniReadSettingByName(SectionId, "BootPartition", SettingValue, sizeof(SettingValue)))
{
UiMessageBox("Boot partition not specified for selected OS!");
return;
}
PartitionNumber = atoi(SettingValue);
// Get the partition table entry
if (!DiskGetPartitionEntry(DriveNumber, PartitionNumber, &PartitionTableEntry))
{
return;
}
// Now try to read the partition boot sector
// If this fails then abort
if (!MachDiskReadLogicalSectors(DriveNumber, PartitionTableEntry.SectorCountBeforePartition, 1, (PVOID)0x7C00))
{
UiMessageBox("Unable to read partition's boot sector.");
return;
}
// Check for validity
if (*((USHORT*)(0x7c00 + 0x1fe)) != 0xaa55)
{
UiMessageBox("Invalid boot sector magic (0xaa55)");
return;
}
UiUnInitialize("Booting...");
// Don't stop the floppy drive motor when we
// are just booting a bootsector, or drive, or partition.
// If we were to stop the floppy motor then
// the BIOS wouldn't be informed and if the
// next read is to a floppy then the BIOS will
// still think the motor is on and this will
// result in a read error.
//DiskStopFloppyMotor();
//DisableA20();
ChainLoadBiosBootSectorCode();
}
VOID
GetHarddiskInformation(
UCHAR DriveNumber)
{
PMASTER_BOOT_RECORD Mbr;
ULONG *Buffer;
ULONG i;
ULONG Checksum;
ULONG Signature;
CHAR ArcName[256];
PARTITION_TABLE_ENTRY PartitionTableEntry;
PCHAR Identifier = PcDiskIdentifier[DriveNumber - 0x80];
/* Read the MBR */
if (!MachDiskReadLogicalSectors(DriveNumber, 0ULL, 1, (PVOID)DISKREADBUFFER))
{
ERR("Reading MBR failed\n");
return;
}
Buffer = (ULONG*)DISKREADBUFFER;
Mbr = (PMASTER_BOOT_RECORD)DISKREADBUFFER;
Signature = Mbr->Signature;
TRACE("Signature: %x\n", Signature);
/* Calculate the MBR checksum */
Checksum = 0;
for (i = 0; i < 128; i++)
{
Checksum += Buffer[i];
}
Checksum = ~Checksum + 1;
TRACE("Checksum: %x\n", Checksum);
/* Fill out the ARC disk block */
reactos_arc_disk_info[reactos_disk_count].Signature = Signature;
reactos_arc_disk_info[reactos_disk_count].CheckSum = Checksum;
sprintf(ArcName, "multi(0)disk(0)rdisk(%lu)", reactos_disk_count);
strcpy(reactos_arc_strings[reactos_disk_count], ArcName);
reactos_arc_disk_info[reactos_disk_count].ArcName =
reactos_arc_strings[reactos_disk_count];
reactos_disk_count++;
sprintf(ArcName, "multi(0)disk(0)rdisk(%u)partition(0)", DriveNumber - 0x80);
FsRegisterDevice(ArcName, &DiskVtbl);
/* Add partitions */
i = 1;
DiskReportError(FALSE);
while (DiskGetPartitionEntry(DriveNumber, i, &PartitionTableEntry))
{
if (PartitionTableEntry.SystemIndicator != PARTITION_ENTRY_UNUSED)
{
sprintf(ArcName, "multi(0)disk(0)rdisk(%u)partition(%lu)", DriveNumber - 0x80, i);
FsRegisterDevice(ArcName, &DiskVtbl);
}
i++;
}
DiskReportError(TRUE);
/* Convert checksum and signature to identifier string */
Identifier[0] = Hex[(Checksum >> 28) & 0x0F];
Identifier[1] = Hex[(Checksum >> 24) & 0x0F];
Identifier[2] = Hex[(Checksum >> 20) & 0x0F];
Identifier[3] = Hex[(Checksum >> 16) & 0x0F];
Identifier[4] = Hex[(Checksum >> 12) & 0x0F];
Identifier[5] = Hex[(Checksum >> 8) & 0x0F];
Identifier[6] = Hex[(Checksum >> 4) & 0x0F];
Identifier[7] = Hex[Checksum & 0x0F];
Identifier[8] = '-';
Identifier[9] = Hex[(Signature >> 28) & 0x0F];
Identifier[10] = Hex[(Signature >> 24) & 0x0F];
Identifier[11] = Hex[(Signature >> 20) & 0x0F];
Identifier[12] = Hex[(Signature >> 16) & 0x0F];
Identifier[13] = Hex[(Signature >> 12) & 0x0F];
Identifier[14] = Hex[(Signature >> 8) & 0x0F];
Identifier[15] = Hex[(Signature >> 4) & 0x0F];
Identifier[16] = Hex[Signature & 0x0F];
Identifier[17] = '-';
Identifier[18] = 'A';
Identifier[19] = 0;
TRACE("Identifier: %s\n", Identifier);
}
