src/cpu/o3/free_list.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: Kevin Lim
  29  */
  30
  31 #include "base/trace.hh"
  32
  33 #include "cpu/o3/free_list.hh"
  34
  35 SimpleFreeList::SimpleFreeList(unsigned activeThreads,
  36                                unsigned _numLogicalIntRegs,
  37                                unsigned _numPhysicalIntRegs,
  38                                unsigned _numLogicalFloatRegs,
  39                                unsigned _numPhysicalFloatRegs)
  40     : numLogicalIntRegs(_numLogicalIntRegs),
  41       numPhysicalIntRegs(_numPhysicalIntRegs),
  42       numLogicalFloatRegs(_numLogicalFloatRegs),
  43       numPhysicalFloatRegs(_numPhysicalFloatRegs),
  44       numPhysicalRegs(numPhysicalIntRegs + numPhysicalFloatRegs)
  45 {
  46     DPRINTF(FreeList, "Creating new free list object.\n");
  47
  48     // Put all of the extra physical registers onto the free list.  This
  49     // means excluding all of the base logical registers.
  50     for (PhysRegIndex i = numLogicalIntRegs * activeThreads;
  51          i < numPhysicalIntRegs; ++i)
  52     {
  53         freeIntRegs.push(i);
  54     }
  55
  56     // Put all of the extra physical registers onto the free list.  This
  57     // means excluding all of the base logical registers.  Because the
  58     // float registers' indices start where the physical registers end,
  59     // some math must be done to determine where the free registers start.
  60     PhysRegIndex i = numPhysicalIntRegs + (numLogicalFloatRegs * activeThreads);
  61
  62     for ( ; i < numPhysicalRegs; ++i)
  63     {
  64         freeFloatRegs.push(i);
  65     }
  66 }
  67
  68 std::string
  69 SimpleFreeList::name() const
  70 {
  71     return "cpu.freelist";
  72 }