cmos.cc revision 5393 
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/south_bridge/cmos.hh"
32#include "mem/packet_access.hh"
33
34Tick
35X86ISA::Cmos::read(PacketPtr pkt)
36{
37    assert(pkt->getSize() == 1);
38    switch(pkt->getAddr() - addrRange.start)
39    {
40      case 0x0:
41        pkt->set(address);
42        break;
43      case 0x1:
44        pkt->set(readRegister(address));
45        break;
46      default:
47        panic("Read from undefined CMOS port.\n");
48    }
49    return latency;
50}
51
52Tick
53X86ISA::Cmos::write(PacketPtr pkt)
54{
55    assert(pkt->getSize() == 1);
56    switch(pkt->getAddr() - addrRange.start)
57    {
58      case 0x0:
59        address = pkt->get<uint8_t>();
60        break;
61      case 0x1:
62        writeRegister(address, pkt->get<uint8_t>());
63        break;
64      default:
65        panic("Write to undefined CMOS port.\n");
66    }
67    return latency;
68}
69
70uint8_t
71X86ISA::Cmos::readRegister(uint8_t reg)
72{
73    assert(reg < numRegs);
74    if (reg <= 0xD) {
75        return rtc.readData(reg);
76    } else {
77        warn("Reading non-volitile CMOS address %x as %x.\n", reg, regs[reg]);
78    }
79    return regs[reg];
80}
81
82void
83X86ISA::Cmos::writeRegister(uint8_t reg, uint8_t val)
84{
85    assert(reg < numRegs);
86    if (reg <= 0xD) {
87        rtc.writeData(reg, val);
88        return;
89    } else {
90        warn("Writing non-volitile CMOS address %x with %x.\n", reg, val);
91    }
92    regs[reg] = val;
93}
94