dma_device.cc revision 2384 
1/*
2 * Copyright (c) 2004-2005 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
32void
33PioPort::SendEvent::process()
34{
35    if (port->sendTiming(packet) == Success)
36        return;
37
38    port->transmitList.push_back(&packet);
39}
40
41PioDevice::PioDevice(const std::string &name, Platform *p)
42    : SimObject(name), platform(p)
43{
44    pioPort = new PioPort(this);
45}
46
47
48bool
49PioDevice::recvTiming(Packet &pkt)
50{
51    device->recvAtomic(pkt);
52    sendTiming(pkt, pkt.responseTime-pkt.requestTime);
53    return Success;
54}
55
56PioDevice::~PioDevice()
57{
58    if (pioPort)
59        delete pioInterface;
60}
61
62void
63DmaPort::sendDma(Packet &pkt)
64{
65    device->platform->system->memoryMode()
66    {
67        case MemAtomic:
68    }
69}
70
71DmaDevice::DmaDevice(const std::string &name, Platform *p)
72    : PioDevice(name, p)
73{
74    dmaPort = new dmaPort(this);
75}
76
77void
78DmaPort::dmaAction(Memory::Command cmd, DmaPort port, Addr addr, int size,
79                     Event *event, uint8_t *data = NULL)
80{
81
82    assert(event);
83
84    int prevSize = 0;
85    Packet basePkt;
86    Request baseReq;
87
88    basePkt.flags = 0;
89    basePkt.coherence = NULL;
90    basePkt.senderState = NULL;
91    basePkt.src = 0;
92    basePkt.dest = 0;
93    basePkt.cmd = cmd;
94    basePkt.result = Unknown;
95    basePkt.request = NULL;
96    baseReq.nicReq = true;
97    baseReq.time = curTick;
98
99    completionEvent = event;
100
101    for (ChunkGenerator gen(addr, size, sendBlockSizeQuery()); !gen.done(); gen.next()) {
102            Packet *pkt = new Packet(basePkt);
103            Request *req = new Request(baseReq);
104            pkt->addr = gen.addr();
105            pkt->size = gen.size();
106            pkt->req = req;
107            pkt->req->paddr = pkt->addr;
108            pkt->req->size = pkt->size;
109            // Increment the data pointer on a write
110            pkt->data = data ? data + prevSize : NULL ;
111            prevSize = pkt->size;
112
113            sendDma(*pkt);
114    }
115}
116
117
118void
119DmaPort::sendDma(Packet &pkt)
120{
121   // some kind of selction between access methods
122   // more work is going to have to be done to make
123   // switching actually work
124   MemState state = device->platform->system->memState;
125
126   if (state == Timing) {
127       if (sendTiming(pkt) == Failure)
128           transmitList.push_back(&packet);
129   } else if (state == Atomic) {
130       sendAtomic(pkt);
131       completionEvent->schedule(pkt.responseTime - pkt.requestTime);
132       completionEvent == NULL;
133   } else if (state == Functional) {
134       sendFunctional(pkt);
135       // Is this correct???
136       completionEvent->schedule(pkt.responseTime - pkt.requestTime);
137       completionEvent == NULL;
138   } else
139       panic("Unknown memory command state.");
140
141}
142
143DmaDevice::~DmaDevice()
144{
145    if (dmaInterface)
146        delete dmaInterface;
147}
148
149
150