/// <summary>
/// This method discover the current ATA device and try to read all its configurations
/// </summary>
private void Discover()
{
mDevice = Device.IDE_None;
mBufferSize = 0;
Status xStatus;
bool Error = false;
// Select Drive
SelectDrive();
// Send Identify command
PortIO.Out8(CommandReg, (byte)Cmd.ATA_CMD_IDENTIFY);
Wait();
if (PortIO.In8(StatusReg) == 0)
{
return; // No Device
}
while (true)
{
xStatus = (Status)PortIO.In8(StatusReg);
if ((xStatus & Status.ATA_SR_ERR) != 0)
{
Error = true; // If Err, Device is not ATA.
break;
}
if (((xStatus & Status.ATA_SR_BSY) == 0) && ((xStatus & Status.ATA_SR_DRQ) != 0))
{
break; // Everything is fine
}
Wait();
}
mDevice = Device.IDE_ATA;
mBufferSize = 512;
// (IV) Probe for ATAPI Devices:
if (Error)
{
ushort xTypeID = (ushort)(PortIO.In8(LBA2) << 8 | PortIO.In8(LBA1));
if (xTypeID == 0xEB14 || xTypeID == 0x9669)
{
mDevice = Device.IDE_ATAPI;
mBufferSize = 2048;
mATAPI_Packet = new byte[12];
}
else
{
mDevice = Device.IDE_None;
mBufferSize = 0;
return;
}
// Send Identify packet command
PortIO.Out8(CommandReg, (byte)Cmd.ATA_CMD_IDENTIFY_PACKET);
Wait();
}
var xBuff = new ushort[256];
PortIO.Read16(DataReg, xBuff);
// ATA/ATAPI COnfig
mIsRemovable = (xBuff[(int)Identify.ATA_IDENT_DEVICETYPE] & (1 << 7)) > 0;
// CHS configurations
mCylinder = xBuff.ToUInt32((int)Identify.ATA_IDENT_CYLINDERS);
mHeads = xBuff.ToUInt32((int)Identify.ATA_IDENT_HEADS);
mSectorsPerTrack = xBuff.ToUInt32((int)Identify.ATA_IDENT_SECTORS);
mCommandSet = xBuff.ToUInt32((int)Identify.ATA_IDENT_COMMANDSETS);
ushort xFieldValid = xBuff[(int)Identify.ATA_IDENT_FIELDVALID];
// 1st bit determine weather it support LBA or not
mLBASupport = (bool)((xFieldValid & 1) == 1);
if ((mCommandSet & (1 << 26)) != 0)
{
// Device uses 48-Bit Addressing:
throw new Exception("48bit addresssing not supported");
}
//mSize = xBuff.ToUInt48((int)Identify.ATA_IDENT_MAX_LBA_EXT);
else
{
// Device uses CHS or 28-bit Addressing:
mSize = xBuff.ToUInt32((int)Identify.ATA_IDENT_MAX_LBA);
}
// Read Model, Firmware, SerialNo.
mModel = xBuff.GetString((int)Identify.ATA_IDENT_MODEL, 40);
mSerialNo = xBuff.GetString((int)Identify.ATA_IDENT_SERIAL, 20);
}
