src/dev/x86/cmos.cc

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