src/dev/x86/cmos.hh

   1 /*
   2  * Copyright (c) 2008 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 #ifndef __DEV_X86_CMOS_HH__
  32 #define __DEV_X86_CMOS_HH__
  33
  34 #include "dev/io_device.hh"
  35 #include "dev/mc146818.hh"
  36 #include "params/Cmos.hh"
  37
  38 namespace X86ISA
  39 {
  40
  41 class Cmos : public BasicPioDevice
  42 {
  43   protected:
  44     Tick latency;
  45
  46     uint8_t address;
  47
  48     static const int numRegs = 128;
  49
  50     uint8_t regs[numRegs];
  51
  52     uint8_t readRegister(uint8_t reg);
  53     void writeRegister(uint8_t reg, uint8_t val);
  54
  55     class X86RTC : public MC146818
  56     {
  57       public:
  58         X86RTC(EventManager *em, const std::string &n, const struct tm time,
  59                 bool bcd, Tick frequency) :
  60             MC146818(em, n, time, bcd, frequency)
  61         {
  62         }
  63       protected:
  64         void handleEvent()
  65         {
  66             return;
  67         }
  68     } rtc;
  69
  70   public:
  71     typedef CmosParams Params;
  72
  73     Cmos(const Params *p) : BasicPioDevice(p), latency(p->pio_latency),
  74         rtc(this, "rtc", p->time, true, ULL(5000000000))
  75     {
  76         pioSize = 2;
  77         memset(regs, 0, numRegs * sizeof(uint8_t));
  78         address = 0;
  79     }
  80
  81     Tick read(PacketPtr pkt);
  82
  83     Tick write(PacketPtr pkt);
  84 };
  85
  86 }; // namespace X86ISA
  87
  88 #endif //__DEV_X86_CMOS_HH__