src/cpu/o3/cpu_builder.cc

   1 /*
   2  * Copyright (c) 2004-2006 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: Kevin Lim
  29  */
  30
  31 #include <string>
  32
  33 #include "config/full_system.hh"
  34 #include "config/use_checker.hh"
  35 #include "cpu/o3/cpu.hh"
  36 #include "cpu/o3/impl.hh"
  37 #include "params/DerivO3CPU.hh"
  38
  39 class DerivO3CPU : public FullO3CPU<O3CPUImpl>
  40 {
  41   public:
  42     DerivO3CPU(DerivO3CPUParams *p)
  43         : FullO3CPU<O3CPUImpl>(p)
  44     { }
  45 };
  46
  47 DerivO3CPU *
  48 DerivO3CPUParams::create()
  49 {
  50 #if FULL_SYSTEM
  51     // Full-system only supports a single thread for the moment.
  52     ThreadID actual_num_threads = 1;
  53 #else
  54     if (workload.size() > numThreads) {
  55         fatal("Workload Size (%i) > Max Supported Threads (%i) on This CPU",
  56               workload.size(), numThreads);
  57     } else if (workload.size() == 0) {
  58         fatal("Must specify at least one workload!");
  59     }
  60
  61     // In non-full-system mode, we infer the number of threads from
  62     // the workload if it's not explicitly specified.
  63     ThreadID actual_num_threads =
  64         (numThreads >= workload.size()) ? numThreads : workload.size();
  65 #endif
  66
  67     numThreads = actual_num_threads;
  68
  69     // Default smtFetchPolicy to "RoundRobin", if necessary.
  70     std::string round_robin_policy = "RoundRobin";
  71     std::string single_thread = "SingleThread";
  72
  73     if (actual_num_threads > 1 && single_thread.compare(smtFetchPolicy) == 0)
  74         smtFetchPolicy = round_robin_policy;
  75     else
  76         smtFetchPolicy = smtFetchPolicy;
  77
  78     instShiftAmt = 2;
  79
  80     return new DerivO3CPU(this);
  81 }