1 files changed, 128 insertions, 0 deletions
diff --git a/dev/etherbus.cc b/dev/etherbus.cc
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+++ b/dev/etherbus.cc
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+/*
+ * Copyright (c) 2003 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* @file
+ * Device module for modelling an ethernet hub
+ */
+
+#include <deque>
+#include <string>
+#include <vector>
+
+#include <math.h>
+
+#include "etherbus.hh"
+#include "etherdump.hh"
+#include "etherint.hh"
+#include "etherpkt.hh"
+#include "trace.hh"
+#include "universe.hh"
+
+using namespace std;
+
+EtherBus::EtherBus(const string &name, double rate, bool loop,
+                   EtherDump *packet_dump)
+    : SimObject(name), ticks_per_byte(rate), loopback(loop),
+      event(&mainEventQueue, this),
+      sender(0), dump(packet_dump)
+{ }
+
+void
+EtherBus::txDone()
+{
+    devlist_t::iterator i = devlist.begin();
+    devlist_t::iterator end = devlist.end();
+
+    DPRINTF(Ethernet, "ethernet packet received: length=%d\n", packet->length);
+    DDUMP(EthernetData, packet->data, packet->length);
+
+    while (i != end) {
+        if (loopback || *i != sender)
+            (*i)->sendPacket(packet);
+        ++i;
+    }
+
+    sender->sendDone();
+
+    if (dump)
+        dump->dump(packet);
+
+    sender = 0;
+    packet = 0;
+}
+
+void
+EtherBus::reg(EtherInt *dev)
+{ devlist.push_back(dev); }
+
+bool
+EtherBus::send(EtherInt *sndr, PacketPtr pkt)
+{
+    if (busy()) {
+        DPRINTF(Ethernet, "ethernet packet not sent, bus busy\n", curTick);
+        return false;
+    }
+
+    DPRINTF(Ethernet, "ethernet packet sent: length=%d\n", pkt->length);
+    DDUMP(EthernetData, pkt->data, pkt->length);
+
+    packet = pkt;
+    sender = sndr;
+    int delay = (int)ceil(((double)pkt->length * ticks_per_byte) + 1.0);
+    DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n",
+            delay, ticks_per_byte);
+    event.schedule(curTick + delay);
+
+    return true;
+}
+
+BEGIN_DECLARE_SIM_OBJECT_PARAMS(EtherBus)
+
+    Param<bool> loopback;
+    Param<int> speed;
+    SimObjectParam<EtherDump *> packet_dump;
+
+END_DECLARE_SIM_OBJECT_PARAMS(EtherBus)
+
+BEGIN_INIT_SIM_OBJECT_PARAMS(EtherBus)
+
+    INIT_PARAM_DFLT(loopback,
+                    "send the packet back to the interface from which it came",
+                    true),
+    INIT_PARAM_DFLT(speed, "bus speed in bits per second", 100000000),
+    INIT_PARAM_DFLT(packet_dump, "object to dump network packets to", NULL)
+
+END_INIT_SIM_OBJECT_PARAMS(EtherBus)
+
+CREATE_SIM_OBJECT(EtherBus)
+{
+    double rate = ((double)ticksPerSecond * 8.0) / (double)speed;
+    return new EtherBus(getInstanceName(), rate, loopback, packet_dump);
+}
+
+REGISTER_SIM_OBJECT("EtherBus", EtherBus)