cmos.cc revision 7799:5d0f62927d75 
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#include "dev/x86/intdev.hh"
33#include "mem/packet_access.hh"
34
35void
36X86ISA::Cmos::X86RTC::handleEvent()
37{
38    assert(intPin);
39    intPin->raise();
40    //XXX This is a hack.
41    intPin->lower();
42}
43
44Tick
45X86ISA::Cmos::read(PacketPtr pkt)
46{
47    assert(pkt->getSize() == 1);
48    switch(pkt->getAddr() - pioAddr)
49    {
50      case 0x0:
51        pkt->set(address);
52        break;
53      case 0x1:
54        pkt->set(readRegister(address));
55        break;
56      default:
57        panic("Read from undefined CMOS port.\n");
58    }
59    pkt->makeAtomicResponse();
60    return latency;
61}
62
63Tick
64X86ISA::Cmos::write(PacketPtr pkt)
65{
66    assert(pkt->getSize() == 1);
67    switch(pkt->getAddr() - pioAddr)
68    {
69      case 0x0:
70        address = pkt->get<uint8_t>();
71        break;
72      case 0x1:
73        writeRegister(address, pkt->get<uint8_t>());
74        break;
75      default:
76        panic("Write to undefined CMOS port.\n");
77    }
78    pkt->makeAtomicResponse();
79    return latency;
80}
81
82uint8_t
83X86ISA::Cmos::readRegister(uint8_t reg)
84{
85    assert(reg < numRegs);
86    uint8_t val;
87    if (reg <= 0xD) {
88        val = rtc.readData(reg);
89        DPRINTF(CMOS,
90            "Reading CMOS RTC reg %x as %x.\n", reg, val);
91    } else {
92        val = regs[reg];
93        DPRINTF(CMOS,
94            "Reading non-volitile CMOS address %x as %x.\n", reg, val);
95    }
96    return val;
97}
98
99void
100X86ISA::Cmos::writeRegister(uint8_t reg, uint8_t val)
101{
102    assert(reg < numRegs);
103    if (reg <= 0xD) {
104        DPRINTF(CMOS, "Writing CMOS RTC reg %x with %x.\n",
105                reg, val);
106        rtc.writeData(reg, val);
107    } else {
108        DPRINTF(CMOS, "Writing non-volitile CMOS address %x with %x.\n",
109                reg, val);
110        regs[reg] = val;
111    }
112}
113
114X86ISA::Cmos *
115CmosParams::create()
116{
117    return new X86ISA::Cmos(this);
118}
119