io_device.cc revision 2641
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    : Port(dev->name() + "-pioport"), 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 &resp, AddrRangeList &snoop)
52{
53    snoop.clear();
54    device->addressRanges(resp);
55}
56
57
58Packet *
59PioPort::recvRetry()
60{
61    Packet* pkt = transmitList.front();
62    transmitList.pop_front();
63    return pkt;
64}
65
66
67void
68PioPort::SendEvent::process()
69{
70    if (port->Port::sendTiming(packet))
71        return;
72
73    port->transmitList.push_back(packet);
74}
75
76
77bool
78PioPort::recvTiming(Packet *pkt)
79{
80    device->recvAtomic(pkt);
81    // turn packet around to go back to requester
82    pkt->makeTimingResponse();
83    sendTiming(pkt, pkt->time - pkt->req->getTime());
84    return true;
85}
86
87PioDevice::~PioDevice()
88{
89    if (pioPort)
90        delete pioPort;
91}
92
93void
94PioDevice::init()
95{
96    if (!pioPort)
97        panic("Pio port not connected to anything!");
98    pioPort->sendStatusChange(Port::RangeChange);
99}
100
101void
102BasicPioDevice::addressRanges(AddrRangeList &range_list)
103{
104    assert(pioSize != 0);
105    range_list.clear();
106    range_list.push_back(RangeSize(pioAddr, pioSize));
107}
108
109
110DmaPort::DmaPort(DmaDevice *dev, Platform *p)
111    : Port(dev->name() + "-dmaport"), device(dev), platform(p), pendingCount(0)
112{ }
113
114bool
115DmaPort::recvTiming(Packet *pkt)
116{
117    if (pkt->senderState) {
118        DmaReqState *state;
119        state = dynamic_cast<DmaReqState*>(pkt->senderState);
120        state->completionEvent->schedule(pkt->time - pkt->req->getTime());
121        delete pkt->req;
122        delete pkt;
123    }  else {
124        delete pkt->req;
125        delete pkt;
126    }
127
128    return Packet::Success;
129}
130
131DmaDevice::DmaDevice(Params *p)
132    : PioDevice(p), dmaPort(NULL)
133{ }
134
135void
136DmaPort::SendEvent::process()
137{
138    if (port->Port::sendTiming(packet))
139        return;
140
141    port->transmitList.push_back(packet);
142}
143
144Packet *
145DmaPort::recvRetry()
146{
147    Packet* pkt = transmitList.front();
148    transmitList.pop_front();
149    return pkt;
150}
151
152
153void
154DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
155                   uint8_t *data)
156{
157    assert(event);
158
159    int prevSize = 0;
160
161    for (ChunkGenerator gen(addr, size, peerBlockSize());
162         !gen.done(); gen.next()) {
163            Request *req = new Request(false);
164            req->setPaddr(gen.addr());
165            req->setSize(gen.size());
166            req->setTime(curTick);
167            Packet *pkt = new Packet(req, cmd, Packet::Broadcast);
168
169            // Increment the data pointer on a write
170            if (data)
171                pkt->dataStatic(data + prevSize) ;
172
173            prevSize += gen.size();
174
175            // Set the last bit of the dma as the final packet for this dma
176            // and set it's completion event.
177            if (prevSize == size) {
178                pkt->senderState = new DmaReqState(event, true);
179            }
180            assert(pendingCount >= 0);
181            pendingCount++;
182            sendDma(pkt);
183    }
184}
185
186
187void
188DmaPort::sendDma(Packet *pkt)
189{
190   // some kind of selction between access methods
191   // more work is going to have to be done to make
192   // switching actually work
193  /* MemState state = device->platform->system->memState;
194
195   if (state == Timing) {
196       if (!sendTiming(pkt))
197           transmitList.push_back(&packet);
198    } else if (state == Atomic) {*/
199       sendAtomic(pkt);
200       if (pkt->senderState) {
201           DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState);
202           state->completionEvent->schedule(curTick + (pkt->time - pkt->req->getTime()) +1);
203       }
204       pendingCount--;
205       assert(pendingCount >= 0);
206       delete pkt->req;
207       delete pkt;
208
209/*   } else if (state == Functional) {
210       sendFunctional(pkt);
211       // Is this correct???
212       completionEvent->schedule(pkt->req->responseTime - pkt->req->requestTime);
213       completionEvent == NULL;
214   } else
215       panic("Unknown memory command state.");
216  */
217}
218
219DmaDevice::~DmaDevice()
220{
221    if (dmaPort)
222        delete dmaPort;
223}
224
225
226