src/arch/sparc/intregfile.cc

   1 /*
   2  * Copyright (c) 2003-2005 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: Gabe Black
  29  *          Ali Saidi
  30  */
  31
  32 #include "arch/sparc/intregfile.hh"
  33 #include "base/trace.hh"
  34 #include "sim/serialize.hh"
  35
  36 using namespace SparcISA;
  37 using namespace std;
  38
  39 class Checkpoint;
  40
  41 string SparcISA::getIntRegName(RegIndex index)
  42 {
  43     static std::string intRegName[NumIntRegs] =
  44         {"g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
  45          "o0", "o1", "o2", "o3", "o4", "o5", "o6", "o7",
  46          "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
  47          "i0", "i1", "i2", "i3", "i4", "i5", "i6", "i7"};
  48     return intRegName[index];
  49 }
  50
  51 int IntRegFile::flattenIndex(int reg)
  52 {
  53     int flatIndex = offset[reg >> FrameOffsetBits]
  54         | (reg & FrameOffsetMask);
  55     DPRINTF(Sparc, "Flattened index %d into %d.\n", reg, flatIndex);
  56     return flatIndex;
  57 }
  58
  59 void IntRegFile::clear()
  60 {
  61     int x;
  62     for (x = 0; x < MaxGL; x++)
  63         memset(regGlobals[x], 0, sizeof(IntReg) * RegsPerFrame);
  64     for(int x = 0; x < 2 * NWindows; x++)
  65         bzero(regSegments[x], sizeof(IntReg) * RegsPerFrame);
  66 }
  67
  68 IntRegFile::IntRegFile()
  69 {
  70     offset[Globals] = 0;
  71     regView[Globals] = regGlobals[0];
  72     setCWP(0);
  73     clear();
  74 }
  75
  76 IntReg IntRegFile::readReg(int intReg)
  77 {
  78     IntReg val =
  79         regView[intReg >> FrameOffsetBits][intReg & FrameOffsetMask];
  80     DPRINTF(Sparc, "Read register %d = 0x%x\n", intReg, val);
  81     return val;
  82 }
  83
  84 Fault IntRegFile::setReg(int intReg, const IntReg &val)
  85 {
  86     if(intReg)
  87     {
  88         DPRINTF(Sparc, "Wrote register %d = 0x%x\n", intReg, val);
  89         regView[intReg >> FrameOffsetBits][intReg & FrameOffsetMask] = val;
  90     }
  91     return NoFault;
  92 }
  93
  94 //This doesn't effect the actual CWP register.
  95 //It's purpose is to adjust the view of the register file
  96 //to what it would be if CWP = cwp.
  97 void IntRegFile::setCWP(int cwp)
  98 {
  99     int index = ((NWindows - cwp) % NWindows) * 2;
 100     offset[Outputs] = FrameOffset + (index * RegsPerFrame);
 101     offset[Locals] = FrameOffset + ((index+1) * RegsPerFrame);
 102     offset[Inputs] = FrameOffset +
 103         (((index+2) % (NWindows * 2)) * RegsPerFrame);
 104     regView[Outputs] = regSegments[index];
 105     regView[Locals] = regSegments[index+1];
 106     regView[Inputs] = regSegments[(index+2) % (NWindows * 2)];
 107
 108     DPRINTF(Sparc, "Changed the CWP value to %d\n", cwp);
 109 }
 110
 111 void IntRegFile::setGlobals(int gl)
 112 {
 113     DPRINTF(Sparc, "Now using %d globals", gl);
 114
 115     regView[Globals] = regGlobals[gl];
 116     offset[Globals] = RegGlobalOffset + gl * RegsPerFrame;
 117 }
 118
 119 void IntRegFile::serialize(std::ostream &os)
 120 {
 121     unsigned int x;
 122     for(x = 0; x < MaxGL; x++)
 123         SERIALIZE_ARRAY(regGlobals[x], RegsPerFrame);
 124     for(x = 0; x < 2 * NWindows; x++)
 125         SERIALIZE_ARRAY(regSegments[x], RegsPerFrame);
 126 }
 127
 128 void IntRegFile::unserialize(Checkpoint *cp, const std::string &section)
 129 {
 130     unsigned int x;
 131     for(x = 0; x < MaxGL; x++)
 132         UNSERIALIZE_ARRAY(regGlobals[x], RegsPerFrame);
 133     for(unsigned int x = 0; x < 2 * NWindows; x++)
 134         UNSERIALIZE_ARRAY(regSegments[x], RegsPerFrame);
 135 }