io_device.cc revision 2512
1/* 2 * Copyright (c) 2006 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include "dev/io_device.hh" 30#include "sim/builder.hh" 31 32 33PioPort::PioPort(PioDevice *dev, Platform *p) 34 : device(dev), platform(p) 35{ } 36 37 38Tick 39PioPort::recvAtomic(Packet &pkt) 40{ 41 return device->recvAtomic(pkt); 42} 43 44void 45PioPort::recvFunctional(Packet &pkt) 46{ 47 device->recvAtomic(pkt); 48} 49 50void 51PioPort::getDeviceAddressRanges(AddrRangeList &range_list, bool &owner) 52{ 53 device->addressRanges(range_list, owner); 54} 55 56 57Packet * 58PioPort::recvRetry() 59{ 60 Packet* pkt = transmitList.front(); 61 transmitList.pop_front(); 62 return pkt; 63} 64 65 66void 67PioPort::SendEvent::process() 68{ 69 if (port->Port::sendTiming(packet) == Success) 70 return; 71 72 port->transmitList.push_back(&packet); 73} 74 75 76bool 77PioPort::recvTiming(Packet &pkt) 78{ 79 device->recvAtomic(pkt); 80 sendTiming(pkt, pkt.time-pkt.req->time); 81 return Success; 82} 83 84PioDevice::~PioDevice() 85{ 86 if (pioPort) 87 delete pioPort; 88} 89 90 91DmaPort::DmaPort(DmaDevice *dev) 92 : device(dev) 93{ } 94 95bool 96DmaPort::recvTiming(Packet &pkt) 97{ 98 completionEvent->schedule(curTick+1); 99 completionEvent = NULL; 100 return Success; 101} 102 103DmaDevice::DmaDevice(const std::string &name, Platform *p) 104 : PioDevice(name, p) 105{ 106 dmaPort = new DmaPort(this); 107} 108 109void 110DmaPort::SendEvent::process() 111{ 112 if (port->Port::sendTiming(packet) == Success) 113 return; 114 115 port->transmitList.push_back(&packet); 116} 117 118Packet * 119DmaPort::recvRetry() 120{ 121 Packet* pkt = transmitList.front(); 122 transmitList.pop_front(); 123 return pkt; 124} 125void 126DmaPort::dmaAction(Command cmd, DmaPort port, Addr addr, int size, 127 Event *event, uint8_t *data) 128{ 129 130 assert(event); 131 132 int prevSize = 0; 133 Packet basePkt; 134 Request baseReq; 135 136 basePkt.flags = 0; 137 basePkt.coherence = NULL; 138 basePkt.senderState = NULL; 139 basePkt.src = 0; 140 basePkt.dest = 0; 141 basePkt.cmd = cmd; 142 basePkt.result = Unknown; 143 basePkt.req = NULL; 144 baseReq.nicReq = true; 145 baseReq.time = curTick; 146 147 completionEvent = event; 148 149 for (ChunkGenerator gen(addr, size, peerBlockSize()); 150 !gen.done(); gen.next()) { 151 Packet *pkt = new Packet(basePkt); 152 Request *req = new Request(baseReq); 153 pkt->addr = gen.addr(); 154 pkt->size = gen.size(); 155 pkt->req = req; 156 pkt->req->paddr = pkt->addr; 157 pkt->req->size = pkt->size; 158 // Increment the data pointer on a write 159 pkt->data = data ? data + prevSize : NULL ; 160 prevSize += pkt->size; 161 162 sendDma(*pkt); 163 } 164} 165 166 167void 168DmaPort::sendDma(Packet &pkt) 169{ 170 // some kind of selction between access methods 171 // more work is going to have to be done to make 172 // switching actually work 173 /* MemState state = device->platform->system->memState; 174 175 if (state == Timing) { 176 if (sendTiming(pkt) == Failure) 177 transmitList.push_back(&packet); 178 } else if (state == Atomic) {*/ 179 sendAtomic(pkt); 180 completionEvent->schedule(pkt.time - pkt.req->time); 181 completionEvent = NULL; 182/* } else if (state == Functional) { 183 sendFunctional(pkt); 184 // Is this correct??? 185 completionEvent->schedule(pkt.req->responseTime - pkt.req->requestTime); 186 completionEvent == NULL; 187 } else 188 panic("Unknown memory command state."); 189 */ 190} 191 192DmaDevice::~DmaDevice() 193{ 194 if (dmaPort) 195 delete dmaPort; 196} 197 198void 199BasePioDevice::addressRanges(AddrRangeList &range_list, bool &owner) 200{ 201 assert(pioSize != 0); 202 owner = true; 203 range_list.clear(); 204 range_list.push_back(RangeSize(pio_addr, sizeof(struct alphaAccess))); 205} 206 207 208