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/system.hh"
  40
  41 using namespace std;
  42
  43 IsaFake::IsaFake(Params *p)
  44     : BasicPioDevice(p)
  45 {
  46     if (!p->ret_bad_addr)
  47         pioSize = p->pio_size;
  48
  49     retData8 = p->ret_data8;
  50     retData16 = p->ret_data16;
  51     retData32 = p->ret_data32;
  52     retData64 = p->ret_data64;
  53 }
  54
  55 Tick
  56 IsaFake::read(PacketPtr pkt)
  57 {
  58     assert(pkt->result == Packet::Unknown);
  59
  60     if (params()->warn_access != "")
  61         warn("Device %s accessed by read to address %#x size=%d\n",
  62                 name(), pkt->getAddr(), pkt->getSize());
  63     if (params()->ret_bad_addr) {
  64         DPRINTF(Tsunami, "read to bad address va=%#x size=%d\n",
  65                 pkt->getAddr(), pkt->getSize());
  66         pkt->result = Packet::BadAddress;
  67     } else {
  68         assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
  69         DPRINTF(Tsunami, "read  va=%#x size=%d\n",
  70                 pkt->getAddr(), pkt->getSize());
  71         switch (pkt->getSize()) {
  72           case sizeof(uint64_t):
  73              pkt->set(retData64);
  74              break;
  75           case sizeof(uint32_t):
  76              pkt->set(retData32);
  77              break;
  78           case sizeof(uint16_t):
  79              pkt->set(retData16);
  80              break;
  81           case sizeof(uint8_t):
  82              pkt->set(retData8);
  83              break;
  84           default:
  85             panic("invalid access size!\n");
  86         }
  87         pkt->result = Packet::Success;
  88     }
  89     return pioDelay;
  90 }
  91
  92 Tick
  93 IsaFake::write(PacketPtr pkt)
  94 {
  95     if (params()->warn_access != "") {
  96         uint64_t data;
  97         switch (pkt->getSize()) {
  98           case sizeof(uint64_t):
  99             data = pkt->get<uint64_t>();
 100             break;
 101           case sizeof(uint32_t):
 102             data = pkt->get<uint32_t>();
 103             break;
 104           case sizeof(uint16_t):
 105             data = pkt->get<uint16_t>();
 106             break;
 107           case sizeof(uint8_t):
 108             data = pkt->get<uint8_t>();
 109             break;
 110           default:
 111             panic("invalid access size!\n");
 112         }
 113         warn("Device %s accessed by write to address %#x size=%d data=%#x\n",
 114                 name(), pkt->getAddr(), pkt->getSize(), data);
 115     }
 116     if (params()->ret_bad_addr) {
 117         DPRINTF(Tsunami, "write to bad address va=%#x size=%d \n",
 118                 pkt->getAddr(), pkt->getSize());
 119         pkt->result = Packet::BadAddress;
 120     } else {
 121         DPRINTF(Tsunami, "write - va=%#x size=%d \n",
 122                 pkt->getAddr(), pkt->getSize());
 123
 124         if (params()->update_data) {
 125             switch (pkt->getSize()) {
 126               case sizeof(uint64_t):
 127                 retData64 = pkt->get<uint64_t>();
 128                 break;
 129               case sizeof(uint32_t):
 130                 retData32 = pkt->get<uint32_t>();
 131                 break;
 132               case sizeof(uint16_t):
 133                 retData16 = pkt->get<uint16_t>();
 134                 break;
 135               case sizeof(uint8_t):
 136                 retData8 = pkt->get<uint8_t>();
 137                 break;
 138               default:
 139                 panic("invalid access size!\n");
 140             }
 141         }
 142         pkt->result = Packet::Success;
 143     }
 144     return pioDelay;
 145 }
 146
 147 IsaFake *
 148 IsaFakeParams::create()
 149 {
 150     return new IsaFake(this);
 151 }