i8259.hh revision 5631:38912b6250d0 
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 * Authors: Gabe Black
29 */
30
31#ifndef __DEV_X86_I8259_HH__
32#define __DEV_X86_I8259_HH__
33
34#include "dev/io_device.hh"
35#include "params/I8259.hh"
36
37namespace X86ISA
38{
39
40class I8259 : public BasicPioDevice
41{
42  protected:
43    Tick latency;
44    bool master;
45
46    // Interrupt Request Register
47    uint8_t IRR;
48    // In Service Register
49    uint8_t ISR;
50    // Interrupt Mask Register
51    uint8_t IMR;
52
53    bool edgeTriggered;
54    bool cascadeMode;
55    bool expectICW4;
56    bool readIRR;
57    int initControlWord;
58
59  public:
60    typedef I8259Params Params;
61
62    const Params *
63    params() const
64    {
65        return dynamic_cast<const Params *>(_params);
66    }
67
68    I8259(Params * p) : BasicPioDevice(p)
69    {
70        pioSize = 2;
71        initControlWord = 0;
72        readIRR = true;
73        latency = p->pio_latency;
74        master = p->master;
75    }
76
77    Tick read(PacketPtr pkt);
78
79    Tick write(PacketPtr pkt);
80};
81
82}; // namespace X86ISA
83
84#endif //__DEV_X86_I8259_HH__
85