bridge.cc revision 4877
12568SN/A 22568SN/A/* 32568SN/A * Copyright (c) 2006 The Regents of The University of Michigan 42568SN/A * All rights reserved. 52568SN/A * 62568SN/A * Redistribution and use in source and binary forms, with or without 72568SN/A * modification, are permitted provided that the following conditions are 82568SN/A * met: redistributions of source code must retain the above copyright 92568SN/A * notice, this list of conditions and the following disclaimer; 102568SN/A * redistributions in binary form must reproduce the above copyright 112568SN/A * notice, this list of conditions and the following disclaimer in the 122568SN/A * documentation and/or other materials provided with the distribution; 132568SN/A * neither the name of the copyright holders nor the names of its 142568SN/A * contributors may be used to endorse or promote products derived from 152568SN/A * this software without specific prior written permission. 162568SN/A * 172568SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 182568SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 192568SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 202568SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 212568SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 222568SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 232568SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 242568SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 252568SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 262568SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 272568SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 282665Ssaidi@eecs.umich.edu * 292665Ssaidi@eecs.umich.edu * Authors: Ali Saidi 302665Ssaidi@eecs.umich.edu * Steve Reinhardt 312568SN/A */ 322568SN/A 332568SN/A/** 342982Sstever@eecs.umich.edu * @file 352982Sstever@eecs.umich.edu * Definition of a simple bus bridge without buffering. 362568SN/A */ 372568SN/A 382643Sstever@eecs.umich.edu#include <algorithm> 392568SN/A 402568SN/A#include "base/trace.hh" 412568SN/A#include "mem/bridge.hh" 422568SN/A#include "sim/builder.hh" 432568SN/A 442643Sstever@eecs.umich.eduBridge::BridgePort::BridgePort(const std::string &_name, 452643Sstever@eecs.umich.edu Bridge *_bridge, BridgePort *_otherPort, 464435Ssaidi@eecs.umich.edu int _delay, int _nack_delay, int _req_limit, 474435Ssaidi@eecs.umich.edu int _resp_limit, bool fix_partial_write) 482643Sstever@eecs.umich.edu : Port(_name), bridge(_bridge), otherPort(_otherPort), 494435Ssaidi@eecs.umich.edu delay(_delay), nackDelay(_nack_delay), fixPartialWrite(fix_partial_write), 504435Ssaidi@eecs.umich.edu outstandingResponses(0), queuedRequests(0), inRetry(false), 514435Ssaidi@eecs.umich.edu reqQueueLimit(_req_limit), respQueueLimit(_resp_limit), sendEvent(this) 522643Sstever@eecs.umich.edu{ 532643Sstever@eecs.umich.edu} 542643Sstever@eecs.umich.edu 554435Ssaidi@eecs.umich.eduBridge::Bridge(Params *p) 564435Ssaidi@eecs.umich.edu : MemObject(p->name), 574435Ssaidi@eecs.umich.edu portA(p->name + "-portA", this, &portB, p->delay, p->nack_delay, 584435Ssaidi@eecs.umich.edu p->req_size_a, p->resp_size_a, p->fix_partial_write_a), 594435Ssaidi@eecs.umich.edu portB(p->name + "-portB", this, &portA, p->delay, p->nack_delay, 604435Ssaidi@eecs.umich.edu p->req_size_b, p->resp_size_b, p->fix_partial_write_b), 614435Ssaidi@eecs.umich.edu ackWrites(p->write_ack), _params(p) 622643Sstever@eecs.umich.edu{ 634432Ssaidi@eecs.umich.edu if (ackWrites) 644432Ssaidi@eecs.umich.edu panic("No support for acknowledging writes\n"); 652643Sstever@eecs.umich.edu} 662643Sstever@eecs.umich.edu 672643Sstever@eecs.umich.eduPort * 682738Sstever@eecs.umich.eduBridge::getPort(const std::string &if_name, int idx) 692643Sstever@eecs.umich.edu{ 702643Sstever@eecs.umich.edu BridgePort *port; 712643Sstever@eecs.umich.edu 722643Sstever@eecs.umich.edu if (if_name == "side_a") 732643Sstever@eecs.umich.edu port = &portA; 742643Sstever@eecs.umich.edu else if (if_name == "side_b") 752643Sstever@eecs.umich.edu port = &portB; 762643Sstever@eecs.umich.edu else 772643Sstever@eecs.umich.edu return NULL; 782643Sstever@eecs.umich.edu 792643Sstever@eecs.umich.edu if (port->getPeer() != NULL) 802643Sstever@eecs.umich.edu panic("bridge side %s already connected to.", if_name); 812643Sstever@eecs.umich.edu return port; 822643Sstever@eecs.umich.edu} 832643Sstever@eecs.umich.edu 842643Sstever@eecs.umich.edu 852568SN/Avoid 862568SN/ABridge::init() 872568SN/A{ 882568SN/A // Make sure that both sides are connected to. 892643Sstever@eecs.umich.edu if (portA.getPeer() == NULL || portB.getPeer() == NULL) 904432Ssaidi@eecs.umich.edu fatal("Both ports of bus bridge are not connected to a bus.\n"); 914432Ssaidi@eecs.umich.edu 924432Ssaidi@eecs.umich.edu if (portA.peerBlockSize() != portB.peerBlockSize()) 934432Ssaidi@eecs.umich.edu fatal("Busses don't have the same block size... Not supported.\n"); 942568SN/A} 952568SN/A 964433Ssaidi@eecs.umich.edubool 974435Ssaidi@eecs.umich.eduBridge::BridgePort::respQueueFull() 984433Ssaidi@eecs.umich.edu{ 994435Ssaidi@eecs.umich.edu assert(outstandingResponses >= 0 && outstandingResponses <= respQueueLimit); 1004435Ssaidi@eecs.umich.edu return outstandingResponses >= respQueueLimit; 1014435Ssaidi@eecs.umich.edu} 1024435Ssaidi@eecs.umich.edu 1034435Ssaidi@eecs.umich.edubool 1044435Ssaidi@eecs.umich.eduBridge::BridgePort::reqQueueFull() 1054435Ssaidi@eecs.umich.edu{ 1064435Ssaidi@eecs.umich.edu assert(queuedRequests >= 0 && queuedRequests <= reqQueueLimit); 1074435Ssaidi@eecs.umich.edu return queuedRequests >= reqQueueLimit; 1084433Ssaidi@eecs.umich.edu} 1092568SN/A 1102643Sstever@eecs.umich.edu/** Function called by the port when the bus is receiving a Timing 1112568SN/A * transaction.*/ 1122568SN/Abool 1133349Sbinkertn@umich.eduBridge::BridgePort::recvTiming(PacketPtr pkt) 1142568SN/A{ 1154433Ssaidi@eecs.umich.edu DPRINTF(BusBridge, "recvTiming: src %d dest %d addr 0x%x\n", 1163662Srdreslin@umich.edu pkt->getSrc(), pkt->getDest(), pkt->getAddr()); 1172643Sstever@eecs.umich.edu 1184450Ssaidi@eecs.umich.edu DPRINTF(BusBridge, "Local queue size: %d outreq: %d outresp: %d\n", 1194450Ssaidi@eecs.umich.edu sendQueue.size(), queuedRequests, outstandingResponses); 1204450Ssaidi@eecs.umich.edu DPRINTF(BusBridge, "Remove queue size: %d outreq: %d outresp: %d\n", 1214450Ssaidi@eecs.umich.edu otherPort->sendQueue.size(), otherPort->queuedRequests, 1224450Ssaidi@eecs.umich.edu otherPort->outstandingResponses); 1234450Ssaidi@eecs.umich.edu 1244870Sstever@eecs.umich.edu if (pkt->isRequest() && otherPort->reqQueueFull() && !pkt->wasNacked()) { 1254433Ssaidi@eecs.umich.edu DPRINTF(BusBridge, "Remote queue full, nacking\n"); 1264433Ssaidi@eecs.umich.edu nackRequest(pkt); 1274433Ssaidi@eecs.umich.edu return true; 1283662Srdreslin@umich.edu } 1294433Ssaidi@eecs.umich.edu 1304870Sstever@eecs.umich.edu if (pkt->needsResponse() && !pkt->wasNacked()) 1314435Ssaidi@eecs.umich.edu if (respQueueFull()) { 1324433Ssaidi@eecs.umich.edu DPRINTF(BusBridge, "Local queue full, no space for response, nacking\n"); 1334433Ssaidi@eecs.umich.edu DPRINTF(BusBridge, "queue size: %d outreq: %d outstanding resp: %d\n", 1344433Ssaidi@eecs.umich.edu sendQueue.size(), queuedRequests, outstandingResponses); 1354433Ssaidi@eecs.umich.edu nackRequest(pkt); 1364433Ssaidi@eecs.umich.edu return true; 1374433Ssaidi@eecs.umich.edu } else { 1384433Ssaidi@eecs.umich.edu DPRINTF(BusBridge, "Request Needs response, reserving space\n"); 1394433Ssaidi@eecs.umich.edu ++outstandingResponses; 1404433Ssaidi@eecs.umich.edu } 1414433Ssaidi@eecs.umich.edu 1424433Ssaidi@eecs.umich.edu otherPort->queueForSendTiming(pkt); 1434433Ssaidi@eecs.umich.edu 1444433Ssaidi@eecs.umich.edu return true; 1452657Ssaidi@eecs.umich.edu} 1462657Ssaidi@eecs.umich.edu 1474433Ssaidi@eecs.umich.eduvoid 1484433Ssaidi@eecs.umich.eduBridge::BridgePort::nackRequest(PacketPtr pkt) 1494433Ssaidi@eecs.umich.edu{ 1504433Ssaidi@eecs.umich.edu // Nack the packet 1514870Sstever@eecs.umich.edu pkt->setNacked(); 1524433Ssaidi@eecs.umich.edu pkt->setDest(pkt->getSrc()); 1532657Ssaidi@eecs.umich.edu 1544433Ssaidi@eecs.umich.edu //put it on the list to send 1554435Ssaidi@eecs.umich.edu Tick readyTime = curTick + nackDelay; 1564433Ssaidi@eecs.umich.edu PacketBuffer *buf = new PacketBuffer(pkt, readyTime, true); 1574435Ssaidi@eecs.umich.edu 1584435Ssaidi@eecs.umich.edu // nothing on the list, add it and we're done 1594433Ssaidi@eecs.umich.edu if (sendQueue.empty()) { 1604435Ssaidi@eecs.umich.edu assert(!sendEvent.scheduled()); 1614433Ssaidi@eecs.umich.edu sendEvent.schedule(readyTime); 1624435Ssaidi@eecs.umich.edu sendQueue.push_back(buf); 1634435Ssaidi@eecs.umich.edu return; 1644433Ssaidi@eecs.umich.edu } 1654435Ssaidi@eecs.umich.edu 1664435Ssaidi@eecs.umich.edu assert(sendEvent.scheduled() || inRetry); 1674435Ssaidi@eecs.umich.edu 1684435Ssaidi@eecs.umich.edu // does it go at the end? 1694435Ssaidi@eecs.umich.edu if (readyTime >= sendQueue.back()->ready) { 1704435Ssaidi@eecs.umich.edu sendQueue.push_back(buf); 1714435Ssaidi@eecs.umich.edu return; 1724435Ssaidi@eecs.umich.edu } 1734435Ssaidi@eecs.umich.edu 1744435Ssaidi@eecs.umich.edu // ok, somewhere in the middle, fun 1754435Ssaidi@eecs.umich.edu std::list<PacketBuffer*>::iterator i = sendQueue.begin(); 1764435Ssaidi@eecs.umich.edu std::list<PacketBuffer*>::iterator end = sendQueue.end(); 1774435Ssaidi@eecs.umich.edu std::list<PacketBuffer*>::iterator begin = sendQueue.begin(); 1784435Ssaidi@eecs.umich.edu bool done = false; 1794435Ssaidi@eecs.umich.edu 1804435Ssaidi@eecs.umich.edu while (i != end && !done) { 1814435Ssaidi@eecs.umich.edu if (readyTime < (*i)->ready) { 1824435Ssaidi@eecs.umich.edu if (i == begin) 1834435Ssaidi@eecs.umich.edu sendEvent.reschedule(readyTime); 1844435Ssaidi@eecs.umich.edu sendQueue.insert(i,buf); 1854435Ssaidi@eecs.umich.edu done = true; 1864435Ssaidi@eecs.umich.edu } 1874435Ssaidi@eecs.umich.edu i++; 1884435Ssaidi@eecs.umich.edu } 1894435Ssaidi@eecs.umich.edu assert(done); 1904433Ssaidi@eecs.umich.edu} 1914433Ssaidi@eecs.umich.edu 1924433Ssaidi@eecs.umich.edu 1934433Ssaidi@eecs.umich.eduvoid 1943349Sbinkertn@umich.eduBridge::BridgePort::queueForSendTiming(PacketPtr pkt) 1952657Ssaidi@eecs.umich.edu{ 1964870Sstever@eecs.umich.edu if (pkt->isResponse() || pkt->wasNacked()) { 1972643Sstever@eecs.umich.edu // This is a response for a request we forwarded earlier. The 1982643Sstever@eecs.umich.edu // corresponding PacketBuffer should be stored in the packet's 1992643Sstever@eecs.umich.edu // senderState field. 2002643Sstever@eecs.umich.edu PacketBuffer *buf = dynamic_cast<PacketBuffer*>(pkt->senderState); 2012643Sstever@eecs.umich.edu assert(buf != NULL); 2022643Sstever@eecs.umich.edu // set up new packet dest & senderState based on values saved 2032643Sstever@eecs.umich.edu // from original request 2042643Sstever@eecs.umich.edu buf->fixResponse(pkt); 2054433Ssaidi@eecs.umich.edu 2064450Ssaidi@eecs.umich.edu // Check if this packet was expecting a response and it's a nacked 2074450Ssaidi@eecs.umich.edu // packet, in which case we will never being seeing it 2084870Sstever@eecs.umich.edu if (buf->expectResponse && pkt->wasNacked()) 2094433Ssaidi@eecs.umich.edu --outstandingResponses; 2104433Ssaidi@eecs.umich.edu 2114433Ssaidi@eecs.umich.edu 2122657Ssaidi@eecs.umich.edu DPRINTF(BusBridge, "restoring sender state: %#X, from packet buffer: %#X\n", 2132657Ssaidi@eecs.umich.edu pkt->senderState, buf); 2142643Sstever@eecs.umich.edu DPRINTF(BusBridge, " is response, new dest %d\n", pkt->getDest()); 2152643Sstever@eecs.umich.edu delete buf; 2162643Sstever@eecs.umich.edu } 2172643Sstever@eecs.umich.edu 2184450Ssaidi@eecs.umich.edu 2194870Sstever@eecs.umich.edu if (pkt->isRequest() && !pkt->wasNacked()) { 2204450Ssaidi@eecs.umich.edu ++queuedRequests; 2214450Ssaidi@eecs.umich.edu } 2224450Ssaidi@eecs.umich.edu 2234450Ssaidi@eecs.umich.edu 2244450Ssaidi@eecs.umich.edu 2252643Sstever@eecs.umich.edu Tick readyTime = curTick + delay; 2262643Sstever@eecs.umich.edu PacketBuffer *buf = new PacketBuffer(pkt, readyTime); 2272657Ssaidi@eecs.umich.edu DPRINTF(BusBridge, "old sender state: %#X, new sender state: %#X\n", 2282657Ssaidi@eecs.umich.edu buf->origSenderState, buf); 2292643Sstever@eecs.umich.edu 2302643Sstever@eecs.umich.edu // If we're about to put this packet at the head of the queue, we 2312643Sstever@eecs.umich.edu // need to schedule an event to do the transmit. Otherwise there 2322643Sstever@eecs.umich.edu // should already be an event scheduled for sending the head 2332643Sstever@eecs.umich.edu // packet. 2342643Sstever@eecs.umich.edu if (sendQueue.empty()) { 2352643Sstever@eecs.umich.edu sendEvent.schedule(readyTime); 2362568SN/A } 2372643Sstever@eecs.umich.edu sendQueue.push_back(buf); 2382568SN/A} 2392568SN/A 2402568SN/Avoid 2412643Sstever@eecs.umich.eduBridge::BridgePort::trySend() 2422568SN/A{ 2432643Sstever@eecs.umich.edu assert(!sendQueue.empty()); 2442568SN/A 2452643Sstever@eecs.umich.edu PacketBuffer *buf = sendQueue.front(); 2462643Sstever@eecs.umich.edu 2472643Sstever@eecs.umich.edu assert(buf->ready <= curTick); 2482643Sstever@eecs.umich.edu 2493349Sbinkertn@umich.edu PacketPtr pkt = buf->pkt; 2502643Sstever@eecs.umich.edu 2514454Ssaidi@eecs.umich.edu // Ugly! @todo When multilevel coherence works this will be removed 2524432Ssaidi@eecs.umich.edu if (pkt->cmd == MemCmd::WriteInvalidateReq && fixPartialWrite && 2534870Sstever@eecs.umich.edu !pkt->wasNacked()) { 2544454Ssaidi@eecs.umich.edu PacketPtr funcPkt = new Packet(pkt->req, MemCmd::WriteReq, 2554454Ssaidi@eecs.umich.edu Packet::Broadcast); 2564454Ssaidi@eecs.umich.edu funcPkt->dataStatic(pkt->getPtr<uint8_t>()); 2574454Ssaidi@eecs.umich.edu sendFunctional(funcPkt); 2584454Ssaidi@eecs.umich.edu pkt->cmd = MemCmd::WriteReq; 2594454Ssaidi@eecs.umich.edu delete funcPkt; 2604432Ssaidi@eecs.umich.edu } 2614432Ssaidi@eecs.umich.edu 2622643Sstever@eecs.umich.edu DPRINTF(BusBridge, "trySend: origSrc %d dest %d addr 0x%x\n", 2632643Sstever@eecs.umich.edu buf->origSrc, pkt->getDest(), pkt->getAddr()); 2642643Sstever@eecs.umich.edu 2654450Ssaidi@eecs.umich.edu bool wasReq = pkt->isRequest(); 2664870Sstever@eecs.umich.edu bool wasNacked = pkt->wasNacked(); 2674432Ssaidi@eecs.umich.edu 2682643Sstever@eecs.umich.edu if (sendTiming(pkt)) { 2692643Sstever@eecs.umich.edu // send successful 2702643Sstever@eecs.umich.edu sendQueue.pop_front(); 2712643Sstever@eecs.umich.edu buf->pkt = NULL; // we no longer own packet, so it's not safe to look at it 2722657Ssaidi@eecs.umich.edu 2732657Ssaidi@eecs.umich.edu if (buf->expectResponse) { 2744433Ssaidi@eecs.umich.edu // Must wait for response 2752657Ssaidi@eecs.umich.edu DPRINTF(BusBridge, " successful: awaiting response (%d)\n", 2762657Ssaidi@eecs.umich.edu outstandingResponses); 2772657Ssaidi@eecs.umich.edu } else { 2782657Ssaidi@eecs.umich.edu // no response expected... deallocate packet buffer now. 2792657Ssaidi@eecs.umich.edu DPRINTF(BusBridge, " successful: no response expected\n"); 2802657Ssaidi@eecs.umich.edu delete buf; 2812657Ssaidi@eecs.umich.edu } 2822657Ssaidi@eecs.umich.edu 2834450Ssaidi@eecs.umich.edu if (!wasNacked) { 2844450Ssaidi@eecs.umich.edu if (wasReq) 2854433Ssaidi@eecs.umich.edu --queuedRequests; 2864450Ssaidi@eecs.umich.edu else 2874450Ssaidi@eecs.umich.edu --outstandingResponses; 2884450Ssaidi@eecs.umich.edu } 2894433Ssaidi@eecs.umich.edu 2902657Ssaidi@eecs.umich.edu // If there are more packets to send, schedule event to try again. 2912657Ssaidi@eecs.umich.edu if (!sendQueue.empty()) { 2922657Ssaidi@eecs.umich.edu buf = sendQueue.front(); 2934433Ssaidi@eecs.umich.edu DPRINTF(BusBridge, "Scheduling next send\n"); 2942657Ssaidi@eecs.umich.edu sendEvent.schedule(std::max(buf->ready, curTick + 1)); 2952657Ssaidi@eecs.umich.edu } 2962643Sstever@eecs.umich.edu } else { 2972643Sstever@eecs.umich.edu DPRINTF(BusBridge, " unsuccessful\n"); 2984435Ssaidi@eecs.umich.edu inRetry = true; 2992643Sstever@eecs.umich.edu } 3004433Ssaidi@eecs.umich.edu DPRINTF(BusBridge, "trySend: queue size: %d outreq: %d outstanding resp: %d\n", 3014433Ssaidi@eecs.umich.edu sendQueue.size(), queuedRequests, outstandingResponses); 3022568SN/A} 3032568SN/A 3042568SN/A 3052657Ssaidi@eecs.umich.eduvoid 3062568SN/ABridge::BridgePort::recvRetry() 3072568SN/A{ 3084435Ssaidi@eecs.umich.edu inRetry = false; 3094435Ssaidi@eecs.umich.edu Tick nextReady = sendQueue.front()->ready; 3104435Ssaidi@eecs.umich.edu if (nextReady <= curTick) 3114435Ssaidi@eecs.umich.edu trySend(); 3124435Ssaidi@eecs.umich.edu else 3134435Ssaidi@eecs.umich.edu sendEvent.schedule(nextReady); 3142568SN/A} 3152568SN/A 3162643Sstever@eecs.umich.edu/** Function called by the port when the bus is receiving a Atomic 3172568SN/A * transaction.*/ 3182568SN/ATick 3193349Sbinkertn@umich.eduBridge::BridgePort::recvAtomic(PacketPtr pkt) 3202568SN/A{ 3214450Ssaidi@eecs.umich.edu // fix partial atomic writes... similar to the timing code that does the 3224454Ssaidi@eecs.umich.edu // same... will be removed once our code gets this right 3234454Ssaidi@eecs.umich.edu if (pkt->cmd == MemCmd::WriteInvalidateReq && fixPartialWrite) { 3244450Ssaidi@eecs.umich.edu 3254454Ssaidi@eecs.umich.edu PacketPtr funcPkt = new Packet(pkt->req, MemCmd::WriteReq, 3264454Ssaidi@eecs.umich.edu Packet::Broadcast); 3274454Ssaidi@eecs.umich.edu funcPkt->dataStatic(pkt->getPtr<uint8_t>()); 3284450Ssaidi@eecs.umich.edu otherPort->sendFunctional(funcPkt); 3294450Ssaidi@eecs.umich.edu delete funcPkt; 3304454Ssaidi@eecs.umich.edu pkt->cmd = MemCmd::WriteReq; 3314450Ssaidi@eecs.umich.edu } 3324454Ssaidi@eecs.umich.edu return delay + otherPort->sendAtomic(pkt); 3332568SN/A} 3342568SN/A 3352643Sstever@eecs.umich.edu/** Function called by the port when the bus is receiving a Functional 3362568SN/A * transaction.*/ 3372568SN/Avoid 3383349Sbinkertn@umich.eduBridge::BridgePort::recvFunctional(PacketPtr pkt) 3392568SN/A{ 3402643Sstever@eecs.umich.edu std::list<PacketBuffer*>::iterator i; 3412568SN/A 3422643Sstever@eecs.umich.edu for (i = sendQueue.begin(); i != sendQueue.end(); ++i) { 3434626Sstever@eecs.umich.edu if (pkt->checkFunctional((*i)->pkt)) 3444626Sstever@eecs.umich.edu return; 3452568SN/A } 3462568SN/A 3474626Sstever@eecs.umich.edu // fall through if pkt still not satisfied 3484626Sstever@eecs.umich.edu otherPort->sendFunctional(pkt); 3492568SN/A} 3502568SN/A 3512643Sstever@eecs.umich.edu/** Function called by the port when the bus is receiving a status change.*/ 3522568SN/Avoid 3532643Sstever@eecs.umich.eduBridge::BridgePort::recvStatusChange(Port::Status status) 3542568SN/A{ 3552643Sstever@eecs.umich.edu otherPort->sendStatusChange(status); 3562568SN/A} 3572568SN/A 3582568SN/Avoid 3592643Sstever@eecs.umich.eduBridge::BridgePort::getDeviceAddressRanges(AddrRangeList &resp, 3604475Sstever@eecs.umich.edu bool &snoop) 3612568SN/A{ 3622643Sstever@eecs.umich.edu otherPort->getPeerAddressRanges(resp, snoop); 3634877Sstever@eecs.umich.edu // we don't allow snooping across bridges 3644877Sstever@eecs.umich.edu snoop = false; 3652568SN/A} 3662568SN/A 3672568SN/ABEGIN_DECLARE_SIM_OBJECT_PARAMS(Bridge) 3682568SN/A 3694435Ssaidi@eecs.umich.edu Param<int> req_size_a; 3704435Ssaidi@eecs.umich.edu Param<int> req_size_b; 3714435Ssaidi@eecs.umich.edu Param<int> resp_size_a; 3724435Ssaidi@eecs.umich.edu Param<int> resp_size_b; 3732568SN/A Param<Tick> delay; 3744435Ssaidi@eecs.umich.edu Param<Tick> nack_delay; 3752568SN/A Param<bool> write_ack; 3764432Ssaidi@eecs.umich.edu Param<bool> fix_partial_write_a; 3774432Ssaidi@eecs.umich.edu Param<bool> fix_partial_write_b; 3782568SN/A 3792568SN/AEND_DECLARE_SIM_OBJECT_PARAMS(Bridge) 3802568SN/A 3812568SN/ABEGIN_INIT_SIM_OBJECT_PARAMS(Bridge) 3822568SN/A 3834435Ssaidi@eecs.umich.edu INIT_PARAM(req_size_a, "The size of the queue for requests coming into side a"), 3844435Ssaidi@eecs.umich.edu INIT_PARAM(req_size_b, "The size of the queue for requests coming into side b"), 3854435Ssaidi@eecs.umich.edu INIT_PARAM(resp_size_a, "The size of the queue for responses coming into side a"), 3864435Ssaidi@eecs.umich.edu INIT_PARAM(resp_size_b, "The size of the queue for responses coming into side b"), 3872568SN/A INIT_PARAM(delay, "The miminum delay to cross this bridge"), 3884435Ssaidi@eecs.umich.edu INIT_PARAM(nack_delay, "The minimum delay to nack a packet"), 3894432Ssaidi@eecs.umich.edu INIT_PARAM(write_ack, "Acknowledge any writes that are received."), 3904432Ssaidi@eecs.umich.edu INIT_PARAM(fix_partial_write_a, "Fixup any partial block writes that are received"), 3914432Ssaidi@eecs.umich.edu INIT_PARAM(fix_partial_write_b, "Fixup any partial block writes that are received") 3922568SN/A 3932568SN/AEND_INIT_SIM_OBJECT_PARAMS(Bridge) 3942568SN/A 3952568SN/ACREATE_SIM_OBJECT(Bridge) 3962568SN/A{ 3974435Ssaidi@eecs.umich.edu Bridge::Params *p = new Bridge::Params; 3984435Ssaidi@eecs.umich.edu p->name = getInstanceName(); 3994435Ssaidi@eecs.umich.edu p->req_size_a = req_size_a; 4004435Ssaidi@eecs.umich.edu p->req_size_b = req_size_b; 4014435Ssaidi@eecs.umich.edu p->resp_size_a = resp_size_a; 4024435Ssaidi@eecs.umich.edu p->resp_size_b = resp_size_b; 4034435Ssaidi@eecs.umich.edu p->delay = delay; 4044435Ssaidi@eecs.umich.edu p->nack_delay = nack_delay; 4054435Ssaidi@eecs.umich.edu p->write_ack = write_ack; 4064435Ssaidi@eecs.umich.edu p->fix_partial_write_a = fix_partial_write_a; 4074435Ssaidi@eecs.umich.edu p->fix_partial_write_b = fix_partial_write_b; 4084435Ssaidi@eecs.umich.edu return new Bridge(p); 4092568SN/A} 4102568SN/A 4112568SN/AREGISTER_SIM_OBJECT("Bridge", Bridge) 4124433Ssaidi@eecs.umich.edu 4134454Ssaidi@eecs.umich.edu 414