src/mem/addr_mapper.cc

   1 /*
   2  * Copyright (c) 2012 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: Andreas Hansson
  38  */
  39
  40 #include "mem/addr_mapper.hh"
  41
  42 AddrMapper::AddrMapper(const AddrMapperParams* p)
  43     : MemObject(p),
  44       masterPort(name() + "-master", *this),
  45       slavePort(name() + "-slave", *this)
  46 {
  47 }
  48
  49 void
  50 AddrMapper::init()
  51 {
  52     if (!slavePort.isConnected() || !masterPort.isConnected())
  53         fatal("Address mapper is not connected on both sides.\n");
  54 }
  55
  56 BaseMasterPort&
  57 AddrMapper::getMasterPort(const std::string& if_name, PortID idx)
  58 {
  59     if (if_name == "master") {
  60         return masterPort;
  61     } else {
  62         return MemObject::getMasterPort(if_name, idx);
  63     }
  64 }
  65
  66 BaseSlavePort&
  67 AddrMapper::getSlavePort(const std::string& if_name, PortID idx)
  68 {
  69     if (if_name == "slave") {
  70         return slavePort;
  71     } else {
  72         return MemObject::getSlavePort(if_name, idx);
  73     }
  74 }
  75
  76 void
  77 AddrMapper::recvFunctional(PacketPtr pkt)
  78 {
  79     Addr orig_addr = pkt->getAddr();
  80     pkt->setAddr(remapAddr(orig_addr));
  81     masterPort.sendFunctional(pkt);
  82     pkt->setAddr(orig_addr);
  83 }
  84
  85 void
  86 AddrMapper::recvFunctionalSnoop(PacketPtr pkt)
  87 {
  88     Addr orig_addr = pkt->getAddr();
  89     pkt->setAddr(remapAddr(orig_addr));
  90     slavePort.sendFunctionalSnoop(pkt);
  91     pkt->setAddr(orig_addr);
  92 }
  93
  94 Tick
  95 AddrMapper::recvAtomic(PacketPtr pkt)
  96 {
  97     Addr orig_addr = pkt->getAddr();
  98     pkt->setAddr(remapAddr(orig_addr));
  99     Tick ret_tick =  masterPort.sendAtomic(pkt);
 100     pkt->setAddr(orig_addr);
 101     return ret_tick;
 102 }
 103
 104 Tick
 105 AddrMapper::recvAtomicSnoop(PacketPtr pkt)
 106 {
 107     Addr orig_addr = pkt->getAddr();
 108     pkt->setAddr(remapAddr(orig_addr));
 109     Tick ret_tick = slavePort.sendAtomicSnoop(pkt);
 110     pkt->setAddr(orig_addr);
 111     return ret_tick;
 112 }
 113
 114 bool
 115 AddrMapper::recvTimingReq(PacketPtr pkt)
 116 {
 117     Addr orig_addr = pkt->getAddr();
 118     bool needsResponse = pkt->needsResponse();
 119     bool memInhibitAsserted = pkt->memInhibitAsserted();
 120
 121     if (needsResponse && !memInhibitAsserted) {
 122         pkt->pushSenderState(new AddrMapperSenderState(orig_addr));
 123     }
 124
 125     pkt->setAddr(remapAddr(orig_addr));
 126
 127     // Attempt to send the packet (always succeeds for inhibited
 128     // packets)
 129     bool successful = masterPort.sendTimingReq(pkt);
 130
 131     // If not successful, restore the address and sender state
 132     if (!successful) {
 133         pkt->setAddr(orig_addr);
 134
 135         if (needsResponse) {
 136             delete pkt->popSenderState();
 137         }
 138     }
 139
 140     return successful;
 141 }
 142
 143 bool
 144 AddrMapper::recvTimingResp(PacketPtr pkt)
 145 {
 146     AddrMapperSenderState* receivedState =
 147         dynamic_cast<AddrMapperSenderState*>(pkt->senderState);
 148
 149     // Restore initial sender state
 150     if (receivedState == NULL)
 151         panic("AddrMapper %s got a response without sender state\n",
 152               name());
 153
 154     Addr remapped_addr = pkt->getAddr();
 155
 156     // Restore the state and address
 157     pkt->senderState = receivedState->predecessor;
 158     pkt->setAddr(receivedState->origAddr);
 159
 160     // Attempt to send the packet
 161     bool successful = slavePort.sendTimingResp(pkt);
 162
 163     // If packet successfully sent, delete the sender state, otherwise
 164     // restore state
 165     if (successful) {
 166         delete receivedState;
 167     } else {
 168         // Don't delete anything and let the packet look like we did
 169         // not touch it
 170         pkt->senderState = receivedState;
 171         pkt->setAddr(remapped_addr);
 172     }
 173     return successful;
 174 }
 175
 176 void
 177 AddrMapper::recvTimingSnoopReq(PacketPtr pkt)
 178 {
 179     slavePort.sendTimingSnoopReq(pkt);
 180 }
 181
 182 bool
 183 AddrMapper::recvTimingSnoopResp(PacketPtr pkt)
 184 {
 185     return masterPort.sendTimingSnoopResp(pkt);
 186 }
 187
 188 bool
 189 AddrMapper::isSnooping() const
 190 {
 191     if (slavePort.isSnooping())
 192         fatal("AddrMapper doesn't support remapping of snooping requests\n");
 193     return false;
 194 }
 195
 196 void
 197 AddrMapper::recvReqRetry()
 198 {
 199     slavePort.sendRetryReq();
 200 }
 201
 202 void
 203 AddrMapper::recvRespRetry()
 204 {
 205     masterPort.sendRetryResp();
 206 }
 207
 208 void
 209 AddrMapper::recvRangeChange()
 210 {
 211     slavePort.sendRangeChange();
 212 }
 213
 214 RangeAddrMapper::RangeAddrMapper(const RangeAddrMapperParams* p) :
 215     AddrMapper(p),
 216     originalRanges(p->original_ranges),
 217     remappedRanges(p->remapped_ranges)
 218 {
 219     if (originalRanges.size() != remappedRanges.size())
 220         fatal("AddrMapper: original and shadowed range list must "
 221               "be same size\n");
 222
 223     for (size_t x = 0; x < originalRanges.size(); x++) {
 224         if (originalRanges[x].size() != remappedRanges[x].size())
 225             fatal("AddrMapper: original and shadowed range list elements"
 226                   " aren't all of the same size\n");
 227     }
 228 }
 229
 230 RangeAddrMapper*
 231 RangeAddrMapperParams::create()
 232 {
 233     return new RangeAddrMapper(this);
 234 }
 235
 236 Addr
 237 RangeAddrMapper::remapAddr(Addr addr) const
 238 {
 239     for (int i = 0; i < originalRanges.size(); ++i) {
 240         if (originalRanges[i].contains(addr)) {
 241             Addr offset = addr - originalRanges[i].start();
 242             return offset + remappedRanges[i].start();
 243         }
 244     }
 245
 246     return addr;
 247 }
 248
 249 AddrRangeList
 250 RangeAddrMapper::getAddrRanges() const
 251 {
 252     // Simply return the original ranges as given by the parameters
 253     AddrRangeList ranges(originalRanges.begin(), originalRanges.end());
 254     return ranges;
 255 }
 256
 257