DMASequencer.hh revision 7008:90c097fb76e1 
1/*
2 * Copyright (c) 2008 Mark D. Hill and David A. Wood
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#ifndef DMASEQUENCER_H
30#define DMASEQUENCER_H
31
32#include <ostream>
33#include "mem/ruby/common/DataBlock.hh"
34#include "mem/ruby/system/RubyPort.hh"
35
36#include "params/DMASequencer.hh"
37
38struct DMARequest {
39  uint64_t start_paddr;
40  int len;
41  bool write;
42  int bytes_completed;
43  int bytes_issued;
44  uint8* data;
45  PacketPtr pkt;
46};
47
48class DMASequencer :public RubyPort {
49public:
50    typedef DMASequencerParams Params;
51  DMASequencer(const Params *);
52  void init();
53  /* external interface */
54  RequestStatus makeRequest(const RubyRequest & request);
55  bool busy() { return m_is_busy;}
56
57  /* SLICC callback */
58  void dataCallback(const DataBlock & dblk);
59  void ackCallback();
60
61  void printConfig(std::ostream & out);
62
63private:
64  void issueNext();
65
66private:
67  bool m_is_busy;
68  uint64_t m_data_block_mask;
69  DMARequest active_request;
70  int num_active_requests;
71};
72
73#endif // DMACONTROLLER_H
74