src/dev/isa_fake.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: Ali Saidi
  29  */
  30
  31 /** @file
  32  * Isa Fake Device implementation
  33  */
  34
  35 #include "base/trace.hh"
  36 #include "dev/isa_fake.hh"
  37 #include "mem/packet.hh"
  38 #include "mem/packet_access.hh"
  39 #include "sim/builder.hh"
  40 #include "sim/system.hh"
  41
  42 using namespace std;
  43
  44 IsaFake::IsaFake(Params *p)
  45     : BasicPioDevice(p)
  46 {
  47     if (!params()->retBadAddr)
  48         pioSize = p->pio_size;
  49
  50     memset(&retData, p->retData, sizeof(retData));
  51 }
  52
  53 void
  54 IsaFake::init()
  55 {
  56     // Only init this device if it's connected to anything.
  57     if (pioPort)
  58         PioDevice::init();
  59 }
  60
  61
  62 Tick
  63 IsaFake::read(PacketPtr pkt)
  64 {
  65     assert(pkt->result == Packet::Unknown);
  66
  67     if (params()->retBadAddr) {
  68         DPRINTF(Tsunami, "read to bad address va=%#x size=%d\n",
  69                 pkt->getAddr(), pkt->getSize());
  70         pkt->result = Packet::BadAddress;
  71     } else {
  72         assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
  73         DPRINTF(Tsunami, "read  va=%#x size=%d\n",
  74                 pkt->getAddr(), pkt->getSize());
  75         switch (pkt->getSize()) {
  76           case sizeof(uint64_t):
  77              pkt->set(retData);
  78              break;
  79           case sizeof(uint32_t):
  80              pkt->set((uint32_t)retData);
  81              break;
  82           case sizeof(uint16_t):
  83              pkt->set((uint16_t)retData);
  84              break;
  85           case sizeof(uint8_t):
  86              pkt->set((uint8_t)retData);
  87              break;
  88           default:
  89             panic("invalid access size!\n");
  90         }
  91         pkt->result = Packet::Success;
  92     }
  93     return pioDelay;
  94 }
  95
  96 Tick
  97 IsaFake::write(PacketPtr pkt)
  98 {
  99     if (params()->retBadAddr) {
 100         DPRINTF(Tsunami, "write to bad address va=%#x size=%d \n",
 101                 pkt->getAddr(), pkt->getSize());
 102         pkt->result = Packet::BadAddress;
 103     } else {
 104         DPRINTF(Tsunami, "write - va=%#x size=%d \n",
 105                 pkt->getAddr(), pkt->getSize());
 106         pkt->result = Packet::Success;
 107     }
 108     return pioDelay;
 109 }
 110
 111 BEGIN_DECLARE_SIM_OBJECT_PARAMS(IsaFake)
 112
 113     Param<Addr> pio_addr;
 114     Param<Tick> pio_latency;
 115     Param<Addr> pio_size;
 116     Param<bool> ret_bad_addr;
 117     Param<uint8_t> ret_data;
 118     SimObjectParam<Platform *> platform;
 119     SimObjectParam<System *> system;
 120
 121 END_DECLARE_SIM_OBJECT_PARAMS(IsaFake)
 122
 123 BEGIN_INIT_SIM_OBJECT_PARAMS(IsaFake)
 124
 125     INIT_PARAM(pio_addr, "Device Address"),
 126     INIT_PARAM(pio_latency, "Programmed IO latency"),
 127     INIT_PARAM(pio_size, "Size of address range"),
 128     INIT_PARAM(ret_bad_addr, "Return pkt status BadAddr"),
 129     INIT_PARAM(ret_data, "Data to return if not bad addr"),
 130     INIT_PARAM(platform, "platform"),
 131     INIT_PARAM(system, "system object")
 132
 133 END_INIT_SIM_OBJECT_PARAMS(IsaFake)
 134
 135 CREATE_SIM_OBJECT(IsaFake)
 136 {
 137     IsaFake::Params *p = new IsaFake::Params;
 138     p->name = getInstanceName();
 139     p->pio_addr = pio_addr;
 140     p->pio_delay = pio_latency;
 141     p->pio_size = pio_size;
 142     p->retBadAddr = ret_bad_addr;
 143     p->retData = ret_data;
 144     p->platform = platform;
 145     p->system = system;
 146     return new IsaFake(p);
 147 }
 148
 149 REGISTER_SIM_OBJECT("IsaFake", IsaFake)