src/dev/arm/rv_ctrl.cc

   1 /*
   2  * Copyright (c) 2010 ARM Limited
   3  * All rights reserved
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions are
  16  * met: redistributions of source code must retain the above copyright
  17  * notice, this list of conditions and the following disclaimer;
  18  * redistributions in binary form must reproduce the above copyright
  19  * notice, this list of conditions and the following disclaimer in the
  20  * documentation and/or other materials provided with the distribution;
  21  * neither the name of the copyright holders nor the names of its
  22  * contributors may be used to endorse or promote products derived from
  23  * this software without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  26  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  27  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  28  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  29  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  31  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  35  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * Authors: Ali Saidi
  38  */
  39
  40 #include "base/trace.hh"
  41 #include "dev/arm/rv_ctrl.hh"
  42 #include "mem/packet.hh"
  43 #include "mem/packet_access.hh"
  44
  45 RealViewCtrl::RealViewCtrl(Params *p)
  46     : BasicPioDevice(p)
  47 {
  48     pioSize = 0xD4;
  49 }
  50
  51 Tick
  52 RealViewCtrl::read(PacketPtr pkt)
  53 {
  54     assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
  55     assert(pkt->getSize() == 4);
  56     Addr daddr = pkt->getAddr() - pioAddr;
  57     pkt->allocate();
  58
  59     switch(daddr) {
  60       case ProcId:
  61         pkt->set(params()->proc_id);
  62         break;
  63       case Clock24:
  64         Tick clk;
  65         clk = (Tick)(curTick / (24 * SimClock::Float::MHz));
  66         pkt->set((uint32_t)(clk));
  67         break;
  68       case Flash:
  69         pkt->set<uint32_t>(0);
  70         break;
  71       default:
  72         panic("Tried to read RealView I/O at offset %#x that doesn't exist\n", daddr);
  73         break;
  74     }
  75     pkt->makeAtomicResponse();
  76     return pioDelay;
  77
  78 }
  79
  80 Tick
  81 RealViewCtrl::write(PacketPtr pkt)
  82 {
  83     assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
  84
  85     Addr daddr = pkt->getAddr() - pioAddr;
  86     switch (daddr) {
  87       case Flash:
  88         break;
  89       default:
  90         panic("Tried to write RVIO at offset %#x that doesn't exist\n", daddr);
  91         break;
  92     }
  93     pkt->makeAtomicResponse();
  94     return pioDelay;
  95 }
  96
  97 void
  98 RealViewCtrl::serialize(std::ostream &os)
  99 {
 100 }
 101
 102 void
 103 RealViewCtrl::unserialize(Checkpoint *cp, const std::string &section)
 104 {
 105 }
 106
 107 RealViewCtrl *
 108 RealViewCtrlParams::create()
 109 {
 110     return new RealViewCtrl(this);
 111 }