internal IoDma(byte ugly)
{
channel = (byte)ugly;
byte addrReg;
byte countReg;
byte pageReg;
byte maskReg;
byte clearReg;
byte modeReg;
eightBit = true;
controlByte = 0;
modeByte = 0;
controlByteMask = 0;
if (channel < 4)
{
// 8 bit transfer
addrReg = (byte)(0x00 + (channel * 2));
countReg = (byte)(0x01 + (channel * 2));
pageReg = (byte)(0x80 + (new byte[4] {
0x7, 0x3, 0x1, 0x2
})[channel]);
maskReg = 0x0A;
clearReg = 0x0C;
modeReg = 0x0B;
eightBit = true;
}
else if (channel > 4 && channel < 8)
{
channel -= 4;
//16 bit channel
addrReg = (byte)(0xC0 + (channel * 4));
countReg = (byte)(0xC2 + (channel * 4));
pageReg = (byte)(0x88 + (new byte[4] {
0x7, 0x3, 0x1, 0x2
})[channel]);
maskReg = 0xD4;
clearReg = 0xD8;
modeReg = 0xD6;
eightBit = false;
}
else
{
Tracing.Log(Tracing.Fatal, "Invalid DMA Channel {0}", channel);
throw new Exception("Invalid DMA Channel");
}
// create ports
addrPort = new IoPort(addrReg, 1, Access.ReadWrite);
countPort = new IoPort(countReg, 1, Access.ReadWrite);
pagePort = new IoPort(pageReg, 1, Access.ReadWrite);
maskPort = new IoPort(maskReg, 1, Access.ReadWrite);
clearPort = new IoPort(clearReg, 1, Access.ReadWrite);
modePort = new IoPort(modeReg, 1, Access.ReadWrite);
}
public PciPort(IoPort addressPort, IoPort dataPort, ushort identifier)
{
this.addressPort = addressPort;
this.dataPort = dataPort;
this.identifier = identifier;
}
