private void SendFrames()
{
this.Log(LogLevel.Noisy, "Sending frame");
var transmitDescriptor = new TxDescriptor(machine.SystemBus);
var packetData = new List <byte>();
transmitDescriptor.Fetch(dmaTransmitDescriptorListAddress);
while (!transmitDescriptor.IsUsed)
{
transmitDescriptor.IsUsed = true;
this.Log(LogLevel.Noisy, "GOING TO READ FROM {0:X}, len={1}", transmitDescriptor.Address1, transmitDescriptor.Buffer1Length);
packetData.AddRange(machine.SystemBus.ReadBytes(transmitDescriptor.Address1, transmitDescriptor.Buffer1Length));
if (!transmitDescriptor.IsNextDescriptorChained)
{
packetData.AddRange(machine.SystemBus.ReadBytes(transmitDescriptor.Address2, transmitDescriptor.Buffer2Length));
}
transmitDescriptor.WriteBack();
if (transmitDescriptor.IsEndOfRing)
{
dmaTransmitDescriptorListAddress = dmaTransmitDescriptorListAddressBegin;
}
else if (transmitDescriptor.IsNextDescriptorChained)
{
dmaTransmitDescriptorListAddress = transmitDescriptor.Address2;
}
else
{
dmaTransmitDescriptorListAddress += 8;
}
if (transmitDescriptor.IsLast)
{
this.Log(LogLevel.Noisy, "Sending frame of {0} bytes.", packetData.Count);
if (Link.IsConnected)
{
var frame = new EthernetFrame(packetData.ToArray());
if (transmitDescriptor.ChecksumInstertionControl > 0)
{
this.Log(LogLevel.Noisy, "Calculating checksum (mode {0}).", transmitDescriptor.ChecksumInstertionControl);
if (transmitDescriptor.ChecksumInstertionControl == 1)
{
//IP only
frame.FillWithChecksums(supportedEtherChecksums, null);
}
else
{
//IP and payload
frame.FillWithChecksums(supportedEtherChecksums, supportedIPChecksums);
}
}
this.Log(LogLevel.Debug, Misc.DumpPacket(frame, true, machine));
packetSent = true;
Link.TransmitFrameFromInterface(frame);
}
}
transmitDescriptor.Fetch(dmaTransmitDescriptorListAddress);
}
//set TransmitBufferUnavailable
dmaStatus |= TransmitBufferUnavailableStatus;
if ((dmaInterruptEnable & (StartStopTransmission)) == 0)
{
IRQ.Set();
}
this.Log(LogLevel.Noisy, "Frame sent.");
}