private void SendFrames()
{
lock(sync)
{
txBufferDescriptor txBD = new txBufferDescriptor(machine.SystemBus);
bool interrupt = false;
List <byte> packet = new List<byte>();
txBD.Fetch(registers.TxQueueBaseAddr);
while(!txBD.Used)
{
while(!txBD.Last)
{
packet.AddRange(machine.SystemBus.ReadBytes(txBD.Word0, txBD.Length));
txBD.Used = true;
txBD.WriteBack();
if(txBD.Wrap)
{
registers.TxQueueBaseAddr = txBufferBase;
}
else
{
registers.TxQueueBaseAddr += 8;
}
txBD.Fetch(registers.TxQueueBaseAddr);
}
interrupt = false;
txBD.Used = true;
packet.AddRange(machine.SystemBus.ReadBytes(txBD.Word0, txBD.Length));
if((registers.DMAConfig & 1u << 11) != 0)//if checksum offload enable
{
if((packet[14] & 0xF0) == 0x40) //IP packet
{
ushort cksum;
IPHeaderLength = (ushort)((packet[14] & 0x0F) * 4);
if(packet[23] == 0x06) // TCP packet
{
IPpacket tcpPacket = new IPpacket(IPHeaderLength, IPpacket.PacketType.TCP);
tcpPacket.ReadFromBuffer(packet.ToArray());
cksum = tcpPacket.GetChecksum();
cksum -= 1;
packet[MACHeaderLegth + IPHeaderLength + 16] = (byte)((cksum >> 8) & 0xFF);
packet[MACHeaderLegth + IPHeaderLength + 17] = (byte)((cksum) & 0xFF);
}
else if(packet[23] == 0x11) // UDP packet
{
IPpacket udpPacket = new IPpacket(IPHeaderLength, IPpacket.PacketType.UDP);
udpPacket.ReadFromBuffer(packet.ToArray());
cksum = udpPacket.GetChecksum();
cksum -= 1;
packet[MACHeaderLegth + IPHeaderLength + 6] = (byte)((cksum >> 8) & 0xFF);
packet[MACHeaderLegth + IPHeaderLength + 7] = (byte)((cksum) & 0xFF);
}
}
}
if(Link.IsConnected)
{
var frame = new EthernetFrame(packet.ToArray());
this.Log(LogLevel.Noisy, "Sending packet length {0}", packet.ToArray().Length);
Link.TransmitFrameFromInterface(frame);
}
txBD.WriteBack();
if(txBD.Wrap)
{
registers.TxQueueBaseAddr = txBufferBase;
}
else
{
registers.TxQueueBaseAddr += 8;
}
registers.TxStatus |= 1u << 5; //tx complete
txBD.Fetch(registers.TxQueueBaseAddr);
if(txBD.Used)
{
registers.TxStatus |= 0x01;
if((registers.InterruptMask & (1u << 3)) == 0)
{
registers.InterruptStatus |= 1u << 3;
interrupt = true;
}
}
if((registers.InterruptMask & (1u << 7)) == 0)
{
registers.InterruptStatus |= 1u << 7;
interrupt = true;
}
if(interrupt)
{
IRQ.Set();
}
}
}
}
private void SendFrames()
{
lock (sync)
{
txBufferDescriptor txBD = new txBufferDescriptor(machine.SystemBus);
bool interrupt = false;
List <byte> packet = new List <byte>();
txBD.Fetch(registers.TxQueueBaseAddr);
while (!txBD.Used)
{
while (!txBD.Last)
{
packet.AddRange(machine.SystemBus.ReadBytes(txBD.Word0, txBD.Length));
txBD.Used = true;
txBD.WriteBack();
if (txBD.Wrap)
{
registers.TxQueueBaseAddr = txBufferBase;
}
else
{
registers.TxQueueBaseAddr += 8;
}
txBD.Fetch(registers.TxQueueBaseAddr);
}
interrupt = false;
txBD.Used = true;
packet.AddRange(machine.SystemBus.ReadBytes(txBD.Word0, txBD.Length));
if ((registers.DMAConfig & 1u << 11) != 0) //if checksum offload enable
{
if ((packet[14] & 0xF0) == 0x40) //IP packet
{
ushort cksum;
IPHeaderLength = (ushort)((packet[14] & 0x0F) * 4);
if (packet[23] == 0x06) // TCP packet
{
IPpacket tcpPacket = new IPpacket(IPHeaderLength, IPpacket.PacketType.TCP);
tcpPacket.ReadFromBuffer(packet.ToArray());
cksum = tcpPacket.GetChecksum();
cksum -= 1;
packet[MACHeaderLegth + IPHeaderLength + 16] = (byte)((cksum >> 8) & 0xFF);
packet[MACHeaderLegth + IPHeaderLength + 17] = (byte)((cksum) & 0xFF);
}
else if (packet[23] == 0x11) // UDP packet
{
IPpacket udpPacket = new IPpacket(IPHeaderLength, IPpacket.PacketType.UDP);
udpPacket.ReadFromBuffer(packet.ToArray());
cksum = udpPacket.GetChecksum();
cksum -= 1;
packet[MACHeaderLegth + IPHeaderLength + 6] = (byte)((cksum >> 8) & 0xFF);
packet[MACHeaderLegth + IPHeaderLength + 7] = (byte)((cksum) & 0xFF);
}
}
}
if (Link.IsConnected)
{
EthernetFrame frame;
if (!txBD.NoCRC)
{
frame = EthernetFrame.CreateEthernetFrameWithCRC(packet.ToArray());
}
else
{
frame = EthernetFrame.CreateEthernetFrameWithoutCRC(packet.ToArray());
}
this.Log(LogLevel.Noisy, "Sending packet length {0}", packet.ToArray().Length);
Link.TransmitFrameFromInterface(frame);
}
txBD.WriteBack();
if (txBD.Wrap)
{
registers.TxQueueBaseAddr = txBufferBase;
}
else
{
registers.TxQueueBaseAddr += 8;
}
registers.TxStatus |= 1u << 5; //tx complete
txBD.Fetch(registers.TxQueueBaseAddr);
if (txBD.Used)
{
registers.TxStatus |= 0x01;
if ((registers.InterruptMask & (1u << 3)) == 0)
{
registers.InterruptStatus |= 1u << 3;
interrupt = true;
}
}
if ((registers.InterruptMask & (1u << 7)) == 0)
{
registers.InterruptStatus |= 1u << 7;
interrupt = true;
}
if (interrupt)
{
IRQ.Set();
}
}
}
}