src/arch/sparc/intregfile.hh

   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 #ifndef __ARCH_SPARC_INTREGFILE_HH__
  33 #define __ARCH_SPARC_INTREGFILE_HH__
  34
  35 #include "arch/sparc/isa_traits.hh"
  36 #include "arch/sparc/types.hh"
  37 #include "base/bitfield.hh"
  38
  39 #include <string>
  40
  41 class Checkpoint;
  42
  43 namespace SparcISA
  44 {
  45     class RegFile;
  46
  47     //This function translates integer register file indices into names
  48     std::string getIntRegName(RegIndex);
  49
  50     const int NumIntArchRegs = 32;
  51     const int NumIntRegs = (MaxGL + 1) * 8 + NWindows * 16 + NumMicroIntRegs;
  52
  53     class IntRegFile
  54     {
  55       private:
  56         friend class RegFile;
  57       protected:
  58         //The number of bits needed to index into each 8 register frame
  59         static const int FrameOffsetBits = 3;
  60         //The number of bits to choose between the 4 sets of 8 registers
  61         static const int FrameNumBits = 2;
  62
  63         //The number of registers per "frame" (8)
  64         static const int RegsPerFrame = 1 << FrameOffsetBits;
  65         //A mask to get the frame number
  66         static const uint64_t FrameNumMask =
  67                 (FrameNumBits == sizeof(int)) ?
  68                 (unsigned int)(-1) :
  69                 (1 << FrameNumBits) - 1;
  70         static const uint64_t FrameOffsetMask =
  71                 (FrameOffsetBits == sizeof(int)) ?
  72                 (unsigned int)(-1) :
  73                 (1 << FrameOffsetBits) - 1;
  74
  75         IntReg regGlobals[MaxGL+1][RegsPerFrame];
  76         IntReg regSegments[2 * NWindows][RegsPerFrame];
  77         IntReg microRegs[NumMicroIntRegs];
  78         IntReg regs[NumIntRegs];
  79
  80         enum regFrame {Globals, Outputs, Locals, Inputs, NumFrames};
  81
  82         IntReg * regView[NumFrames];
  83
  84         static const int RegGlobalOffset = 0;
  85         static const int FrameOffset = (MaxGL + 1) * RegsPerFrame;
  86         int offset[NumFrames];
  87
  88       public:
  89
  90         int flattenIndex(int reg);
  91
  92         void clear();
  93
  94         IntRegFile();
  95
  96         IntReg readReg(int intReg);
  97
  98         void setReg(int intReg, const IntReg &val);
  99
 100         void serialize(std::ostream &os);
 101
 102         void unserialize(Checkpoint *cp, const std::string &section);
 103
 104       protected:
 105         //This doesn't effect the actual CWP register.
 106         //It's purpose is to adjust the view of the register file
 107         //to what it would be if CWP = cwp.
 108         void setCWP(int cwp);
 109
 110         void setGlobals(int gl);
 111     };
 112 }
 113
 114 #endif