src/cpu/func_unit.hh

   1 /*
   2  * Copyright (c) 2002-2006 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
  29 #ifndef __CPU_FUNC_UNIT_HH__
  30 #define __CPU_FUNC_UNIT_HH__
  31
  32 #include <array>
  33 #include <bitset>
  34 #include <string>
  35 #include <vector>
  36
  37 #include "cpu/op_class.hh"
  38 #include "params/FUDesc.hh"
  39 #include "params/OpDesc.hh"
  40 #include "sim/sim_object.hh"
  41
  42 ////////////////////////////////////////////////////////////////////////////
  43 //
  44 //  The SimObjects we use to get the FU information into the simulator
  45 //
  46 ////////////////////////////////////////////////////////////////////////////
  47
  48 //
  49 //  We use 2 objects to specify this data in the INI file:
  50 //    (1) OpDesc - Describes the operation class & latencies
  51 //                   (multiple OpDesc objects can refer to the same
  52 //                   operation classes)
  53 //    (2) FUDesc - Describes the operations available in the unit &
  54 //                   the number of these units
  55 //
  56 //
  57
  58 ////////////////////////////////////////////////////////////////////////////
  59 //
  60 //  Structures used ONLY during the initialization phase...
  61 //
  62 //
  63 //
  64
  65 class OpDesc : public SimObject
  66 {
  67   public:
  68     OpClass opClass;
  69     Cycles opLat;
  70     bool pipelined;
  71
  72     OpDesc(const OpDescParams &p)
  73         : SimObject(p), opClass(p.opClass), opLat(p.opLat),
  74           pipelined(p.pipelined) {};
  75 };
  76
  77 class FUDesc : public SimObject
  78 {
  79   public:
  80     std::vector<OpDesc *> opDescList;
  81     unsigned         number;
  82
  83     FUDesc(const FUDescParams &p)
  84         : SimObject(p), opDescList(p.opList), number(p.count) {};
  85 };
  86
  87 typedef std::vector<OpDesc *>::const_iterator OPDDiterator;
  88 typedef std::vector<FUDesc *>::const_iterator FUDDiterator;
  89
  90
  91
  92
  93 ////////////////////////////////////////////////////////////////////////////
  94 //
  95 //  The actual FU object
  96 //
  97 //
  98 //
  99 class FuncUnit
 100 {
 101   private:
 102     std::array<unsigned, Num_OpClasses> opLatencies;
 103     std::array<bool, Num_OpClasses> pipelined;
 104     std::bitset<Num_OpClasses> capabilityList;
 105
 106   public:
 107     FuncUnit();
 108     FuncUnit(const FuncUnit &fu);
 109
 110     std::string name;
 111
 112     void addCapability(OpClass cap, unsigned oplat, bool pipelined);
 113
 114     bool provides(OpClass capability);
 115     std::bitset<Num_OpClasses> capabilities();
 116
 117     unsigned &opLatency(OpClass capability);
 118     bool isPipelined(OpClass capability);
 119 };
 120
 121 #endif // __FU_POOL_HH__