1
2/*
3 * Copyright (c) 2006 The Regents of The University of Michigan
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met: redistributions of source code must retain the above copyright

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32
33/**
34 * @file
35 * Definition of a simple bus bridge without buffering.
36 */
37
38#include <algorithm>
39
40#include "base/range_ops.hh"
41#include "base/trace.hh"
42#include "mem/bridge.hh"
43#include "params/Bridge.hh"
44
45Bridge::BridgePort::BridgePort(const std::string &_name,
46 Bridge *_bridge, BridgePort *_otherPort,
47 int _delay, int _nack_delay, int _req_limit,
48 int _resp_limit,
49 std::vector<Range<Addr> > filter_ranges)
50 : Port(_name), bridge(_bridge), otherPort(_otherPort),
51 delay(_delay), nackDelay(_nack_delay), filterRanges(filter_ranges),
52 outstandingResponses(0), queuedRequests(0), inRetry(false),
53 reqQueueLimit(_req_limit), respQueueLimit(_resp_limit), sendEvent(this)
54{
55}
56
57Bridge::Bridge(Params *p)
58 : MemObject(p->name),
59 portA(p->name + "-portA", this, &portB, p->delay, p->nack_delay,
60 p->req_size_a, p->resp_size_a, p->filter_ranges_a),
61 portB(p->name + "-portB", this, &portA, p->delay, p->nack_delay,
62 p->req_size_b, p->resp_size_b, p->filter_ranges_b),
63 ackWrites(p->write_ack), _params(p)
64{
65 if (ackWrites)
66 panic("No support for acknowledging writes\n");
67}
68
69Port *
70Bridge::getPort(const std::string &if_name, int idx)

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240 assert(!sendQueue.empty());
241
242 PacketBuffer *buf = sendQueue.front();
243
244 assert(buf->ready <= curTick);
245
246 PacketPtr pkt = buf->pkt;
247
248 DPRINTF(BusBridge, "trySend: origSrc %d dest %d addr 0x%x\n",
249 buf->origSrc, pkt->getDest(), pkt->getAddr());
250
251 bool wasReq = pkt->isRequest();
252 bool wasNacked = pkt->wasNacked();
253
254 if (sendTiming(pkt)) {
255 // send successful

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299 sendEvent.schedule(nextReady);
300}
301
302/** Function called by the port when the bus is receiving a Atomic
303 * transaction.*/
304Tick
305Bridge::BridgePort::recvAtomic(PacketPtr pkt)
306{
307 return delay + otherPort->sendAtomic(pkt);
308}
309
310/** Function called by the port when the bus is receiving a Functional
311 * transaction.*/
312void
313Bridge::BridgePort::recvFunctional(PacketPtr pkt)
314{

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330 otherPort->sendStatusChange(status);
331}
332
333void
334Bridge::BridgePort::getDeviceAddressRanges(AddrRangeList &resp,
335 bool &snoop)
336{
337 otherPort->getPeerAddressRanges(resp, snoop);
338 FilterRangeList(filterRanges, resp);
339 // we don't allow snooping across bridges
340 snoop = false;
341}
342
343Bridge *
344BridgeParams::create()
345{
346 return new Bridge(this);
347}