src/dev/arm/amba_fake.cc

   1 /*
   2  * Copyright (c) 2010, 2019 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  * Copyright (c) 2005 The Regents of The University of Michigan
  15  * All rights reserved.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions are
  19  * met: redistributions of source code must retain the above copyright
  20  * notice, this list of conditions and the following disclaimer;
  21  * redistributions in binary form must reproduce the above copyright
  22  * notice, this list of conditions and the following disclaimer in the
  23  * documentation and/or other materials provided with the distribution;
  24  * neither the name of the copyright holders nor the names of its
  25  * contributors may be used to endorse or promote products derived from
  26  * this software without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  32  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  33  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  34  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  35  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  36  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  37  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  38  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  39  */
  40
  41 #include "dev/arm/amba_fake.hh"
  42
  43 #include "base/trace.hh"
  44 #include "debug/AMBA.hh"
  45 #include "mem/packet.hh"
  46 #include "mem/packet_access.hh"
  47
  48 AmbaFake::AmbaFake(const Params *p)
  49     : AmbaPioDevice(p, 0x1000)
  50 {
  51 }
  52
  53 Tick
  54 AmbaFake::read(PacketPtr pkt)
  55 {
  56     assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
  57
  58     Addr daddr = pkt->getAddr() - pioAddr;
  59
  60     DPRINTF(AMBA, " read register %#x\n", daddr);
  61
  62     pkt->setLE<uint32_t>(0);
  63     if (!readId(pkt, ambaId, pioAddr) && !params()->ignore_access)
  64         panic("Tried to read AmbaFake %s at offset %#x that doesn't exist\n",
  65               name(), daddr);
  66
  67     pkt->makeAtomicResponse();
  68     return pioDelay;
  69 }
  70
  71 Tick
  72 AmbaFake::write(PacketPtr pkt)
  73 {
  74
  75     Addr daddr = pkt->getAddr() - pioAddr;
  76
  77     if (!params()->ignore_access)
  78         panic("Tried to write AmbaFake %s at offset %#x that doesn't exist\n",
  79               name(), daddr);
  80
  81     pkt->makeAtomicResponse();
  82     return pioDelay;
  83 }
  84
  85
  86 AmbaFake *
  87 AmbaFakeParams::create()
  88 {
  89     return new AmbaFake(this);
  90 }