src/dev/sparc/dtod.cc

   1 /*
   2  * Copyright (c) 2004-2006 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: Ali Saidi
  29  */
  30
  31 /** @file
  32  * Time of date device implementation
  33  */
  34 #include <sys/time.h>
  35
  36 #include <deque>
  37 #include <string>
  38 #include <vector>
  39
  40 #include "base/time.hh"
  41 #include "base/trace.hh"
  42 #include "dev/sparc/dtod.hh"
  43 #include "dev/platform.hh"
  44 #include "mem/packet_access.hh"
  45 #include "mem/port.hh"
  46 #include "sim/system.hh"
  47
  48 using namespace std;
  49 using namespace TheISA;
  50
  51 DumbTOD::DumbTOD(const Params *p)
  52     : BasicPioDevice(p)
  53 {
  54     struct tm tm = p->time;
  55     char *tz;
  56
  57     pioSize = 0x08;
  58
  59     tz = getenv("TZ");
  60     setenv("TZ", "", 1);
  61     tzset();
  62     todTime = mktime(&tm);
  63     if (tz)
  64         setenv("TZ", tz, 1);
  65     else
  66         unsetenv("TZ");
  67     tzset();
  68
  69     DPRINTFN("Real-time clock set to %s\n", asctime(&tm));
  70     DPRINTFN("Real-time clock set to %d\n", todTime);
  71 }
  72
  73 Tick
  74 DumbTOD::read(PacketPtr pkt)
  75 {
  76     assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
  77     assert(pkt->getSize() == 8);
  78
  79     pkt->allocate();
  80     pkt->set(todTime);
  81     todTime += 1000;
  82
  83     pkt->makeAtomicResponse();
  84     return pioDelay;
  85 }
  86
  87 Tick
  88 DumbTOD::write(PacketPtr pkt)
  89 {
  90     panic("Dumb tod device doesn't support writes\n");
  91 }
  92
  93 void
  94 DumbTOD::serialize(std::ostream &os)
  95 {
  96     SERIALIZE_SCALAR(todTime);
  97 }
  98
  99 void
 100 DumbTOD::unserialize(Checkpoint *cp, const std::string &section)
 101 {
 102     UNSERIALIZE_SCALAR(todTime);
 103 }
 104
 105 DumbTOD *
 106 DumbTODParams::create()
 107 {
 108     return new DumbTOD(this);
 109 }