private void ReceiveFrameInner(EthernetFrame frame)
{
lock (sync)
{
this.Log(LogLevel.Noisy, "Received packet len {0}", frame.Bytes.Length);
if ((registers.Control & (1u << 2)) == 0)
{
this.Log(LogLevel.Debug, "Receiver not enabled, dropping frame.");
return;
}
if (!registers.IgnoreFCS && !EthernetFrame.CheckCRC(frame.Bytes))
{
this.Log(LogLevel.Info, "Invalid CRC, packet discarded");
return;
}
bool interrupt = false;
rxBufferDescriptor rxBD = new rxBufferDescriptor(machine.SystemBus);
rxBD.Fetch(registers.RxQueueBaseAddr);
if (!rxBD.Ownership)//if we could write data to this BD
{
interrupt = false;
rxBD.Ownership = true;
rxBD.StartOfFrame = true;
rxBD.EndOfFrame = true;
rxBD.Length = (ushort)frame.Bytes.Length;
machine.SystemBus.WriteBytes(frame.Bytes, rxBD.BufferAddress);
rxBD.WriteBack();
if (rxBD.Wrap)
{
registers.RxQueueBaseAddr = rxBufferBase;
}
else
{
registers.RxQueueBaseAddr += 8;
}
registers.RxStatus |= 1u << 1;
if ((registers.InterruptMask & (1u << 1)) == 0)
{
registers.InterruptStatus |= 1u << 1;
interrupt = true;
}
if (interrupt)
{
IRQ.Set();
}
}
}
}
private void ReceiveFrameInner(EthernetFrame frame)
{
lock(sync)
{
this.Log(LogLevel.Noisy, "Received packet len {0}", frame.Length);
if((registers.Control & (1u << 2)) == 0)
{
this.Log(LogLevel.Debug, "Receiver not enabled, dropping frame.");
return;
}
bool interrupt = false;
rxBufferDescriptor rxBD = new rxBufferDescriptor(machine.SystemBus);
rxBD.Fetch(registers.RxQueueBaseAddr);
if(!rxBD.Ownership)//if we could write data to this BD
{
interrupt = false;
rxBD.Ownership = true;
rxBD.StartOfFrame = true;
rxBD.EndOfFrame = true;
rxBD.Length = (ushort)frame.Length;
machine.SystemBus.WriteBytes(frame.Bytes, rxBD.BufferAddress);
rxBD.WriteBack();
if(rxBD.Wrap)
{
registers.RxQueueBaseAddr = rxBufferBase;
}
else
{
registers.RxQueueBaseAddr += 8;
}
registers.RxStatus |= 1u << 1;
if((registers.InterruptMask & (1u << 1)) == 0)
{
registers.InterruptStatus |= 1u << 1;
interrupt = true;
}
if(interrupt)
{
IRQ.Set();
}
}
}
}
