src/cpu/inorder/resources/agen_unit.cc

   1 /*
   2  * Copyright (c) 2007 MIPS Technologies, Inc.
   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: Korey Sewell
  29  *
  30  */
  31
  32 #include "cpu/inorder/resources/agen_unit.hh"
  33 #include "debug/InOrderAGEN.hh"
  34
  35 AGENUnit::AGENUnit(std::string res_name, int res_id, int res_width,
  36                    Cycles res_latency, InOrderCPU *_cpu,
  37                    ThePipeline::Params *params)
  38     : Resource(res_name, res_id, res_width, res_latency, _cpu)
  39 { }
  40
  41 void
  42 AGENUnit::regStats()
  43 {
  44     agens
  45         .name(name() + ".agens")
  46         .desc("Number of Address Generations");
  47
  48     Resource::regStats();
  49 }
  50
  51 void
  52 AGENUnit::execute(int slot_num)
  53 {
  54     ResourceRequest* agen_req = reqs[slot_num];
  55     DynInstPtr inst = reqs[slot_num]->inst;
  56 #if TRACING_ON
  57     ThreadID tid = inst->readTid();
  58 #endif
  59     InstSeqNum seq_num = inst->seqNum;
  60
  61     if (inst->fault != NoFault) {
  62         DPRINTF(InOrderAGEN,
  63                 "[tid:%i]: [sn:%i]: Detected %s fault @ %x. Forwarding to "
  64                 "next stage.\n", tid, inst->seqNum, inst->fault->name(),
  65                 inst->pcState());
  66         agen_req->done();
  67         return;
  68     }
  69
  70     switch (agen_req->cmd)
  71     {
  72       case GenerateAddr:
  73         {
  74             // Load/Store Instruction
  75             if (inst->isMemRef()) {
  76                 DPRINTF(InOrderAGEN,
  77                         "[tid:%i] Generating Address for [sn:%i] (%s).\n",
  78                         tid, seq_num, inst->staticInst->getName());
  79
  80                 inst->fault = inst->calcEA();
  81                 inst->setMemAddr(inst->getEA());
  82
  83                 DPRINTF(InOrderAGEN,
  84                     "[tid:%i] [sn:%i] Effective address calculated as: %#x\n",
  85                     tid, seq_num, inst->getEA());
  86
  87                 if (inst->fault == NoFault) {
  88                     agen_req->done();
  89                 } else {
  90                     fatal("%s encountered while calculating address [sn:%i] %s",
  91                           inst->fault->name(), seq_num, inst->instName());
  92                 }
  93
  94                 agens++;
  95             } else {
  96                 DPRINTF(InOrderAGEN,
  97                         "[tid:] Ignoring non-memory instruction [sn:%i]\n",
  98                         tid, seq_num);
  99                 agen_req->done();
 100             }
 101         }
 102         break;
 103
 104       default:
 105         fatal("Unrecognized command to %s", resName);
 106     }
 107 }