malta_io.hh revision 6379:75d4aaf7dd54 
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: Ali Saidi
29 *          Andrew Schultz
30 *          Miguel Serrano
31 */
32
33/** @file
34 * Malta I/O Space mapping including RTC/timer interrupts
35 */
36
37#ifndef __DEV_MALTA_IO_HH__
38#define __DEV_MALTA_IO_HH__
39
40#include "base/range.hh"
41#include "dev/mips/malta.hh"
42#include "dev/intel_8254_timer.hh"
43#include "dev/io_device.hh"
44#include "dev/mc146818.hh"
45#include "params/MaltaIO.hh"
46#include "sim/eventq.hh"
47
48/**
49 * Malta I/O device is a catch all for all the south bridge stuff we care
50 * to implement.
51 */
52class MaltaIO : public BasicPioDevice
53{
54  private:
55    struct tm tm;
56
57  protected:
58
59    class RTC : public MC146818
60    {
61      public:
62        Malta *malta;
63        RTC(const std::string &name, const MaltaIOParams *p);
64
65      protected:
66        void handleEvent()
67        {
68            //Actually interrupt the processor here
69            malta->cchip->postRTC();
70        }
71    };
72
73    /** Mask of the PIC1 */
74    uint8_t mask1;
75
76    /** Mask of the PIC2 */
77    uint8_t mask2;
78
79    /** Mode of PIC1. Not used for anything */
80    uint8_t mode1;
81
82    /** Mode of PIC2. Not used for anything */
83    uint8_t mode2;
84
85    /** Raw PIC interrupt register before masking */
86    uint8_t picr; //Raw PIC interrput register
87
88    /** Is the pic interrupting right now or not. */
89    bool picInterrupting;
90
91    /** A pointer to the Malta device which be belong to */
92    Malta *malta;
93
94    /** Intel 8253 Periodic Interval Timer */
95    Intel8254Timer pitimer;
96
97    RTC rtc;
98
99    /** The interval is set via two writes to the PIT.
100     * This variable contains a flag as to how many writes have happened, and
101     * the time so far.
102     */
103    uint16_t timerData;
104
105  public:
106    /**
107     * Return the freqency of the RTC
108     * @return interrupt rate of the RTC
109     */
110    Tick frequency() const;
111
112    typedef MaltaIOParams Params;
113
114    const Params *
115    params() const
116    {
117        return dynamic_cast<const Params *>(_params);
118    }
119
120    /**
121     * Initialize all the data for devices supported by Malta I/O.
122     * @param p pointer to Params struct
123     */
124    MaltaIO(const Params *p);
125
126    virtual Tick read(PacketPtr pkt);
127    virtual Tick write(PacketPtr pkt);
128
129
130    /** Post an Interrupt to the CPU */
131    void postIntr(uint8_t interrupt);
132
133    /** Clear an Interrupt to the CPU */
134    void clearIntr(uint8_t interrupt);
135
136    /**
137     * Serialize this object to the given output stream.
138     * @param os The stream to serialize to.
139     */
140    virtual void serialize(std::ostream &os);
141
142    /**
143     * Reconstruct the state of this object from a checkpoint.
144     * @param cp The checkpoint use.
145     * @param section The section name of this object
146     */
147    virtual void unserialize(Checkpoint *cp, const std::string &section);
148
149};
150
151#endif // __DEV_MALTA_IO_HH__
152