cmos.cc revision 13229:b45254f2733a 
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#include "dev/x86/cmos.hh"
32
33#include "debug/CMOS.hh"
34#include "dev/x86/intdev.hh"
35#include "mem/packet_access.hh"
36
37void
38X86ISA::Cmos::X86RTC::handleEvent()
39{
40    assert(intPin);
41    intPin->raise();
42    //XXX This is a hack.
43    intPin->lower();
44}
45
46Tick
47X86ISA::Cmos::read(PacketPtr pkt)
48{
49    assert(pkt->getSize() == 1);
50    switch(pkt->getAddr() - pioAddr)
51    {
52      case 0x0:
53        pkt->setLE(address);
54        break;
55      case 0x1:
56        pkt->setLE(readRegister(address));
57        break;
58      default:
59        panic("Read from undefined CMOS port.\n");
60    }
61    pkt->makeAtomicResponse();
62    return latency;
63}
64
65Tick
66X86ISA::Cmos::write(PacketPtr pkt)
67{
68    assert(pkt->getSize() == 1);
69    switch(pkt->getAddr() - pioAddr)
70    {
71      case 0x0:
72        address = pkt->getLE<uint8_t>();
73        break;
74      case 0x1:
75        writeRegister(address, pkt->getLE<uint8_t>());
76        break;
77      default:
78        panic("Write to undefined CMOS port.\n");
79    }
80    pkt->makeAtomicResponse();
81    return latency;
82}
83
84uint8_t
85X86ISA::Cmos::readRegister(uint8_t reg)
86{
87    assert(reg < numRegs);
88    uint8_t val;
89    if (reg <= 0xD) {
90        val = rtc.readData(reg);
91        DPRINTF(CMOS,
92            "Reading CMOS RTC reg %x as %x.\n", reg, val);
93    } else {
94        val = regs[reg];
95        DPRINTF(CMOS,
96            "Reading non-volitile CMOS address %x as %x.\n", reg, val);
97    }
98    return val;
99}
100
101void
102X86ISA::Cmos::writeRegister(uint8_t reg, uint8_t val)
103{
104    assert(reg < numRegs);
105    if (reg <= 0xD) {
106        DPRINTF(CMOS, "Writing CMOS RTC reg %x with %x.\n",
107                reg, val);
108        rtc.writeData(reg, val);
109    } else {
110        DPRINTF(CMOS, "Writing non-volitile CMOS address %x with %x.\n",
111                reg, val);
112        regs[reg] = val;
113    }
114}
115
116void
117X86ISA::Cmos::startup()
118{
119    rtc.startup();
120}
121
122void
123X86ISA::Cmos::serialize(CheckpointOut &cp) const
124{
125    SERIALIZE_SCALAR(address);
126    SERIALIZE_ARRAY(regs, numRegs);
127
128    // Serialize the timer
129    rtc.serialize("rtc", cp);
130}
131
132void
133X86ISA::Cmos::unserialize(CheckpointIn &cp)
134{
135    UNSERIALIZE_SCALAR(address);
136    UNSERIALIZE_ARRAY(regs, numRegs);
137
138    // Serialize the timer
139    rtc.unserialize("rtc", cp);
140}
141
142X86ISA::Cmos *
143CmosParams::create()
144{
145    return new X86ISA::Cmos(this);
146}
147