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 "base/misc.hh"
  35 #include "sim/serialize.hh"
  36
  37 #include <string.h>
  38
  39 using namespace SparcISA;
  40 using namespace std;
  41
  42 class Checkpoint;
  43
  44 string SparcISA::getIntRegName(RegIndex index)
  45 {
  46     static std::string intRegName[NumIntArchRegs] =
  47         {"g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
  48          "o0", "o1", "o2", "o3", "o4", "o5", "o6", "o7",
  49          "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
  50          "i0", "i1", "i2", "i3", "i4", "i5", "i6", "i7"};
  51     return intRegName[index];
  52 }
  53
  54 int IntRegFile::flattenIndex(int reg)
  55 {
  56     int flatIndex = offset[reg >> FrameOffsetBits]
  57         | (reg & FrameOffsetMask);
  58     DPRINTF(Sparc, "Flattened index %d into %d.\n", reg, flatIndex);
  59     return flatIndex;
  60 }
  61
  62 void IntRegFile::clear()
  63 {
  64     int x;
  65     for (x = 0; x < MaxGL; x++)
  66         memset(regGlobals[x], 0, sizeof(IntReg) * RegsPerFrame);
  67     for(int x = 0; x < 2 * NWindows; x++)
  68         memset(regSegments[x], 0, sizeof(IntReg) * RegsPerFrame);
  69     memset(regs, 0, sizeof(IntReg) * NumIntRegs);
  70 }
  71
  72 IntRegFile::IntRegFile()
  73 {
  74     offset[Globals] = 0;
  75     regView[Globals] = regGlobals[0];
  76     setCWP(0);
  77     clear();
  78 }
  79
  80 IntReg IntRegFile::readReg(int intReg)
  81 {
  82     DPRINTF(Sparc, "Read register %d = 0x%x\n", intReg, regs[intReg]);
  83     return regs[intReg];
  84     /* XXX Currently not used. When used again regView/offset need to be
  85      * serialized!
  86     IntReg val;
  87     if(intReg < NumIntArchRegs)
  88         val = regView[intReg >> FrameOffsetBits][intReg & FrameOffsetMask];
  89     else if((intReg -= NumIntArchRegs) < NumMicroIntRegs)
  90         val = microRegs[intReg];
  91     else
  92         panic("Tried to read non-existant integer register %d, %d\n",
  93                 NumIntArchRegs + NumMicroIntRegs + intReg, intReg);
  94
  95     DPRINTF(Sparc, "Read register %d = 0x%x\n", intReg, val);
  96     return val;
  97     */
  98 }
  99
 100 void IntRegFile::setReg(int intReg, const IntReg &val)
 101 {
 102     if(intReg)
 103     {
 104         DPRINTF(Sparc, "Wrote register %d = 0x%x\n", intReg, val);
 105         regs[intReg] = val;
 106     }
 107     return;
 108     /* XXX Currently not used. When used again regView/offset need to be
 109      * serialized!
 110     if(intReg)
 111     {
 112         DPRINTF(Sparc, "Wrote register %d = 0x%x\n", intReg, val);
 113         if(intReg < NumIntArchRegs)
 114             regView[intReg >> FrameOffsetBits][intReg & FrameOffsetMask] = val;
 115         else if((intReg -= NumIntArchRegs) < NumMicroIntRegs)
 116             microRegs[intReg] = val;
 117         else
 118             panic("Tried to set non-existant integer register\n");
 119     } */
 120 }
 121
 122 //This doesn't effect the actual CWP register.
 123 //It's purpose is to adjust the view of the register file
 124 //to what it would be if CWP = cwp.
 125 void IntRegFile::setCWP(int cwp)
 126 {
 127     int index = ((NWindows - cwp) % NWindows) * 2;
 128     if (index < 0)
 129         panic("Index less than 0. cwp=%d nwin=%d\n", cwp, NWindows);
 130     offset[Outputs] = FrameOffset + (index * RegsPerFrame);
 131     offset[Locals] = FrameOffset + ((index+1) * RegsPerFrame);
 132     offset[Inputs] = FrameOffset +
 133         (((index+2) % (NWindows * 2)) * RegsPerFrame);
 134     regView[Outputs] = regSegments[index];
 135     regView[Locals] = regSegments[index+1];
 136     regView[Inputs] = regSegments[(index+2) % (NWindows * 2)];
 137
 138     DPRINTF(Sparc, "Changed the CWP value to %d\n", cwp);
 139 }
 140
 141 void IntRegFile::setGlobals(int gl)
 142 {
 143     DPRINTF(Sparc, "Now using %d globals\n", gl);
 144
 145     regView[Globals] = regGlobals[gl];
 146     offset[Globals] = RegGlobalOffset + gl * RegsPerFrame;
 147
 148     if (regView[Globals] == regView[Inputs] ||
 149         regView[Globals] == regView[Locals] ||
 150         regView[Globals] == regView[Outputs] )
 151         panic("Two register arrays set to the same thing!\n");
 152 }
 153
 154 void IntRegFile::serialize(std::ostream &os)
 155 {
 156     SERIALIZE_ARRAY(regs, NumIntRegs);
 157     SERIALIZE_ARRAY(microRegs, NumMicroIntRegs);
 158
 159     /* the below doesn't seem needed unless gabe makes regview work*/
 160     unsigned int x;
 161     for(x = 0; x < MaxGL; x++)
 162         SERIALIZE_ARRAY(regGlobals[x], RegsPerFrame);
 163     for(x = 0; x < 2 * NWindows; x++)
 164         SERIALIZE_ARRAY(regSegments[x], RegsPerFrame);
 165 }
 166
 167 void IntRegFile::unserialize(Checkpoint *cp, const std::string &section)
 168 {
 169     UNSERIALIZE_ARRAY(regs, NumIntRegs);
 170     UNSERIALIZE_ARRAY(microRegs, NumMicroIntRegs);
 171
 172     /* the below doesn't seem needed unless gabe makes regview work*/
 173     unsigned int x;
 174     for(x = 0; x < MaxGL; x++)
 175         UNSERIALIZE_ARRAY(regGlobals[x], RegsPerFrame);
 176     for(unsigned int x = 0; x < 2 * NWindows; x++)
 177         UNSERIALIZE_ARRAY(regSegments[x], RegsPerFrame);
 178 }