//protected uint ClusterToFirstSector (uint cluster)
//{
// return ((cluster - 2) * sectorspercluster) + firstdatasector;
//}
protected uint GetClusterEntryValue(uint cluster)
{
uint fatoffset = 0;
if (fatType == FATType.FAT12)
{
fatoffset = (cluster + (cluster / 2));
}
else if (fatType == FATType.FAT16)
{
fatoffset = cluster * 2;
}
else //if (type == FatType.FAT32)
{
fatoffset = cluster * 4;
}
uint sector = fatStart + (fatoffset / bytesPerSector);
uint sectorOffset = fatoffset % bytesPerSector;
uint nbrSectors = 1;
if ((fatType == FATType.FAT12) && (sectorOffset == bytesPerSector - 1))
{
nbrSectors = 2;
}
BinaryFormat fat = new BinaryFormat(partition.ReadBlock(sector, nbrSectors));
uint clusterValue;
if (fatType == FATType.FAT12)
{
clusterValue = fat.GetUShort(sectorOffset);
if (cluster % 2 == 1)
{
clusterValue = clusterValue >> 4;
}
else
{
clusterValue = clusterValue & 0x0fff;
}
}
else if (fatType == FATType.FAT16)
{
clusterValue = fat.GetUShort(sectorOffset);
}
else //if (type == FatType.FAT32)
{
clusterValue = fat.GetUInt(sectorOffset) & 0x0fffffff;
}
return(clusterValue);
}
static public uint GetClusterEntry(byte[] data, uint index, FATType type)
{
BinaryFormat entry = new BinaryFormat(data);
uint cluster = entry.GetUShort((index * Entry.EntrySize) + Entry.FirstCluster);
if (type == FATType.FAT32)
{
uint clusterhi = ((uint)entry.GetUShort((index * Entry.EntrySize) + Entry.EAIndex)) << 16;
cluster = cluster | clusterhi;
}
return(cluster);
}
static public uint GetClusterEntry(byte[] data, uint index, FatType type)
{
BinaryFormat entry = new BinaryFormat(data);
uint cluster = entry.GetUShort(Entry.FirstCluster + (index * Entry.EntrySize));
if (type == FatType.FAT32)
{
cluster |= ((uint)entry.GetUShort(Entry.EAIndex + (index * Entry.EntrySize))) << 16;
}
if (cluster == 0)
{
cluster = 2;
}
return(cluster);
}
/// <summary>
/// Reads the LBA48.
/// </summary>
/// <param name="operation">The operation.</param>
/// <param name="drive">The drive.</param>
/// <param name="lba">The lba.</param>
/// <param name="data">The data.</param>
/// <param name="offset">The offset.</param>
/// <returns></returns>
protected bool ReadLBA48(SectorOperation operation, uint drive, uint lba, byte[] data, uint offset)
{
if (drive > MaximunDriveCount)
{
return(false);
}
FeaturePort.Write8(0);
FeaturePort.Write8(0);
SectorCountPort.Write8(0);
SectorCountPort.Write8(1);
LBALowPort.Write8((byte)((lba >> 24) & 0xFF));
LBALowPort.Write8((byte)(lba & 0xFF));
LBAMidPort.Write8((byte)((lba >> 32) & 0xFF));
LBAMidPort.Write8((byte)((lba >> 8) & 0xFF));
LBAHighPort.Write8((byte)((lba >> 40) & 0xFF));
LBAHighPort.Write8((byte)((lba >> 16) & 0xFF));
DeviceHeadPort.Write8((byte)(0x40 | (drive << 4)));
if (operation == SectorOperation.Write)
{
CommandPort.Write8(0x34);
}
else
{
CommandPort.Write8(0x24);
}
if (!WaitForReqisterReady())
{
return(false);
}
BinaryFormat sector = new BinaryFormat(data);
//TODO: Don't use PIO
if (operation == SectorOperation.Read)
{
for (uint index = 0; index < 256; index++)
{
sector.SetUShort(offset + (index * 2), DataPort.Read16());
}
}
else
{
for (uint index = 0; index < 256; index++)
{
DataPort.Write16(sector.GetUShort(offset + (index * 2)));
}
}
return(true);
}
protected bool SetClusterEntryValue(uint cluster, uint nextcluster)
{
uint fatOffset = 0;
if (fatType == FATType.FAT12)
{
fatOffset = (cluster + (cluster / 2));
}
else if (fatType == FATType.FAT16)
{
fatOffset = cluster * 2;
}
else //if (type == FatType.FAT32)
{
fatOffset = cluster * 4;
}
uint sector = fatStart + (fatOffset / bytesPerSector);
uint sectorOffset = fatOffset % bytesPerSector;
uint nbrSectors = 1;
if ((fatType == FATType.FAT12) && (sectorOffset == bytesPerSector - 1))
{
nbrSectors = 2;
}
BinaryFormat fat = new BinaryFormat(partition.ReadBlock(sector, nbrSectors));
if (fatType == FATType.FAT12)
{
uint clustervalue = fat.GetUShort(sectorOffset);
if (cluster % 2 == 1)
{
clustervalue = ((clustervalue & 0xF) | (nextcluster << 4));
}
else
{
clustervalue = ((clustervalue & 0xf000) | (nextcluster));
}
fat.SetUShort(sectorOffset, (ushort)clustervalue);
}
else if (fatType == FATType.FAT16)
{
fat.SetUShort(sectorOffset, (ushort)nextcluster);
}
else //if (type == FatType.FAT32)
{
fat.SetUInt(sectorOffset, nextcluster);
}
partition.WriteBlock(sector, nbrSectors, fat.Data);
return(true);
}
// doesn't work since uint should be uint64
//protected bool ReadLBA48 (SectorOperation operation, uint drive, uint lba, MemoryBlock memory)
//{
// FeaturePort.Write8 (0);
// FeaturePort.Write8 (0);
// SectorCountPort.Write8 (0);
// SectorCountPort.Write8 (1);
// LBALowPort.Write8 ((byte)((lba >> 24) & 0xFF));
// LBALowPort.Write8 ((byte)(lba & 0xFF));
// LBAMidPort.Write8 ((byte)((lba >> 32) & 0xFF));
// LBAMidPort.Write8 ((byte)((lba >> 8) & 0xFF));
// LBAHighPort.Write8 ((byte)((lba >> 40) & 0xFF));
// LBAHighPort.Write8 ((byte)((lba >> 16) & 0xFF));
// DeviceHeadPort.Write8 ((byte)(0x40 | (drive << 4)));
// if (operation == SectorOperation.Write)
// CommandPort.Write8 (0x34);
// else
// CommandPort.Write8 (0x24);
// if (!WaitForReqisterReady ())
// return false;
// //TODO: Don't use PIO
// if (operation == SectorOperation.Read) {
// for (uint index = 0; index < 256; index++)
// memory.SetUShort (index * 2, DataPort.Read16 ());
// }
// else {
// for (uint index = 0; index < 256; index++)
// DataPort.WriteUShort (memory.GetUShort (index * 2));
// }
// return true;
//}
public bool Open(uint driveNbr)
{
if (driveNbr == 0)
{
DeviceHeadPort.Write8(0xA0);
}
else
if (driveNbr == 1)
{
DeviceHeadPort.Write8(0xB0);
}
else
{
return(false);
}
CommandPort.Write8(IDECommand.IdentifyDrive);
if (!WaitForReqisterReady())
{
return(false);
}
BinaryFormat info = new BinaryFormat(new byte[512]);
for (uint index = 0; index < 256; index++)
{
info.SetUShort(index * 2, DataPort.Read16());
}
driveInfo[driveNbr].MaxLBA = info.GetUInt(IdentifyDrive.MaxLBA28);
// legacy info
driveInfo[driveNbr].Heads = info.GetUShort(IdentifyDrive.LogicalHeads);
driveInfo[driveNbr].Cylinders = info.GetUShort(IdentifyDrive.LogicalCylinders);
driveInfo[driveNbr].SectorsPerTrack = info.GetUShort(IdentifyDrive.LogicalSectors);
return(true);
}
/// <summary>
/// Reads the master boot block.
/// </summary>
/// <returns></returns>
public bool Read()
{
valid = false;
if (diskDevice.BlockSize != 512)
{
return(false); // only going to work with 512 sector sizes
}
if (diskDevice.TotalBlocks < 3)
{
return(false);
}
BinaryFormat masterboot = new BinaryFormat(diskDevice.ReadBlock(0, 1));
if (masterboot.GetUShort(MBR.MBRSignature) != MBRConstant.MBRSignature)
{
return(false);
}
valid = true;
diskSignature = masterboot.GetUInt(MBR.DiskSignature);
for (uint index = 0; index < MaxMBRPartitions; index++)
{
uint offset = MBR.FirstPartition + (index * MBRConstant.PartitionSize);
GenericPartition partition = new GenericPartition(index);
partition.Bootable = masterboot.GetByte(offset + PartitionRecord.Status) == MBRConstant.Bootable;
partition.PartitionType = masterboot.GetByte(offset + PartitionRecord.PartitionType);
partition.StartLBA = masterboot.GetUInt(offset + PartitionRecord.LBA);
partition.TotalBlocks = masterboot.GetUInt(offset + PartitionRecord.Sectors);
Partitions[index] = partition;
}
//TODO: Extended Partitions
code = new byte[MBRConstant.CodeAreaSize];
for (uint index = 0; index < MBRConstant.CodeAreaSize; index++)
{
code[index] = masterboot.GetByte(index);
}
return(valid);
}
protected bool PerformLBA28(SectorOperation operation, uint driveNbr, uint lba, byte[] data, uint offset)
{
FeaturePort.Write8(0);
SectorCountPort.Write8(1);
LBALowPort.Write8((byte)(lba & 0xFF));
LBAMidPort.Write8((byte)((lba >> 8) & 0xFF));
LBAHighPort.Write8((byte)((lba >> 16) & 0xFF));
DeviceHeadPort.Write8((byte)(0xE0 | (driveNbr << 4) | ((lba >> 24) & 0x0F)));
if (operation == SectorOperation.Write)
{
CommandPort.Write8(IDECommand.WriteSectorsWithRetry);
}
else
{
CommandPort.Write8(IDECommand.ReadSectorsWithRetry);
}
if (!WaitForReqisterReady())
{
return(false);
}
BinaryFormat sector = new BinaryFormat(data);
//TODO: Don't use PIO
if (operation == SectorOperation.Read)
{
for (uint index = 0; index < 256; index++)
{
sector.SetUShort(offset + (index * 2), DataPort.Read16());
}
}
else
{
for (uint index = 0; index < 256; index++)
{
DataPort.Write16(sector.GetUShort(offset + (index * 2)));
}
}
return(true);
}
protected bool ReadBootSector()
{
valid = false;
if (blockSize != 512) // only going to work with 512 sector sizes (for now)
{
return(false);
}
BinaryFormat bootSector = new BinaryFormat(partition.ReadBlock(0, 1));
byte bootSignature = bootSector.GetByte(BootSector.ExtendedBootSignature);
if ((bootSignature != 0x29) && (bootSignature != 0x28))
{
return(false);
}
//TextMode.Write ("EOM NAME: ");
//for (uint i = 0; i < 8; i++)
// TextMode.WriteChar (bootsector.GetByte (BootSector.EOMName + i));
//TextMode.WriteLine ();
bytesPerSector = bootSector.GetUShort(BootSector.BytesPerSector);
sectorsPerCluster = bootSector.GetByte(BootSector.SectorsPerCluster);
reservedSectors = bootSector.GetByte(BootSector.ReservedSectors);
nbrFats = bootSector.GetByte(BootSector.FatAllocationTables);
rootEntries = bootSector.GetUShort(BootSector.MaxRootDirEntries);
uint sectorsPerFat16 = bootSector.GetUShort(BootSector.SectorsPerFAT);
uint sectorsPerFat32 = bootSector.GetUInt(BootSector.FAT32_SectorPerFAT);
uint totalSectors16 = bootSector.GetUShort(BootSector.TotalSectors);
uint totalSectors32 = bootSector.GetUInt(BootSector.FAT32_TotalSectors);
uint sectorsPerFat = (sectorsPerFat16 != 0) ? sectorsPerFat16 : sectorsPerFat32;
uint fatSectors = nbrFats * sectorsPerFat;
clusterSizeInBytes = sectorsPerCluster * blockSize;
rootDirSectors = (((rootEntries * 32) + (bytesPerSector - 1)) / bytesPerSector);
firstDataSector = reservedSectors + (nbrFats * sectorsPerFat) + rootDirSectors;
if (totalSectors16 != 0)
{
totalSectors = totalSectors16;
}
else
{
totalSectors = totalSectors32;
}
dataSectors = totalSectors - (reservedSectors + (nbrFats * sectorsPerFat) + rootDirSectors);
totalClusters = dataSectors / sectorsPerCluster;
entriesPerSector = (bytesPerSector / 32);
firstRootDirectorySector = reservedSectors + fatSectors;
dataAreaStart = firstRootDirectorySector + rootDirSectors;
fatStart = reservedSectors;
if (totalClusters < 4085)
{
fatType = FATType.FAT12;
}
else if (totalClusters < 65525)
{
fatType = FATType.FAT16;
}
else
{
fatType = FATType.FAT32;
}
if (fatType == FATType.FAT12)
{
reserved = 0xFF0;
last = 0x0FF8;
bad = 0x0FF7;
fatMask = 0xFFFFFFFF;
fatEntries = sectorsPerFat * 3 * blockSize / 2;
}
else if (fatType == FATType.FAT16)
{
reserved = 0xFFF0;
last = 0xFFF8;
bad = 0xFFF7;
fatMask = 0xFFFFFFFF;
fatEntries = sectorsPerFat * blockSize / 2;
}
else // if (type == FatType.FAT32) {
{
reserved = 0xFFF0;
last = 0x0FFFFFF8;
bad = 0x0FFFFFF7;
fatMask = 0x0FFFFFFF;
fatEntries = sectorsPerFat * blockSize / 4;
}
// some basic checks
if ((nbrFats == 0) || (nbrFats > 2))
{
valid = false;
}
else if (totalSectors == 0)
{
valid = false;
}
else if (sectorsPerFat == 0)
{
valid = false;
}
else if (!((fatType == FATType.FAT12) || (fatType == FATType.FAT16))) // no support for Fat32 yet
{
valid = false;
}
else
{
valid = true;
}
if (valid)
{
base.volumeLabel = bootSector.GetString(fatType != FATType.FAT32 ? BootSector.VolumeLabel : BootSector.FAT32_VolumeLabel, 11);
base.serialNbr = bootSector.GetBytes(fatType != FATType.FAT32 ? BootSector.IDSerialNumber : BootSector.FAT32_IDSerialNumber, 4);
}
return(valid);
}
