diff options
| -rw-r--r-- | src/dev/uart8250.cc | 20 | ||||
| -rw-r--r-- | src/dev/uart8250.hh | 1 |
2 files changed, 16 insertions, 5 deletions
diff --git a/src/dev/uart8250.cc b/src/dev/uart8250.cc index ddee33695..d178bd1af 100644 --- a/src/dev/uart8250.cc +++ b/src/dev/uart8250.cc @@ -68,6 +68,7 @@ Uart8250::IntrEvent::process() DPRINTF(Uart, "UART InterEvent, interrupting\n"); uart->platform->postConsoleInt(); uart->status |= intrBit; + uart->lastTxInt = curTick; } else DPRINTF(Uart, "UART InterEvent, not interrupting\n"); @@ -153,13 +154,13 @@ Uart8250::read(PacketPtr pkt) if (status & RX_INT) /* Rx data interrupt has a higher priority */ pkt->set(IIR_RXID); - else if (status & TX_INT) + else if (status & TX_INT) { pkt->set(IIR_TXID); - else + //Tx interrupts are cleared on IIR reads + status &= ~TX_INT; + } else pkt->set(IIR_NOPEND); - //Tx interrupts are cleared on IIR reads - status &= ~TX_INT; break; case 0x3: // Line Control Register (LCR) pkt->set(LCR); @@ -222,7 +223,16 @@ Uart8250::write(PacketPtr pkt) if (UART_IER_THRI & IER) { DPRINTF(Uart, "IER: IER_THRI set, scheduling TX intrrupt\n"); - txIntrEvent.scheduleIntr(); + if (curTick - lastTxInt > + (Tick)((Clock::Float::s / 2e9) * 450)) { + DPRINTF(Uart, "-- Interrupting Immediately... %d,%d\n", + curTick, lastTxInt); + txIntrEvent.process(); + } else { + DPRINTF(Uart, "-- Delaying interrupt... %d,%d\n", + curTick, lastTxInt); + txIntrEvent.scheduleIntr(); + } } else { diff --git a/src/dev/uart8250.hh b/src/dev/uart8250.hh index c28200592..c9c878aed 100644 --- a/src/dev/uart8250.hh +++ b/src/dev/uart8250.hh @@ -74,6 +74,7 @@ class Uart8250 : public Uart protected: uint8_t IER, DLAB, LCR, MCR; + Tick lastTxInt; class IntrEvent : public Event { |