src/arch/sparc/floatregfile.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_FLOATREGFILE_HH__
  33 #define __ARCH_SPARC_FLOATREGFILE_HH__
  34
  35 #include "arch/sparc/faults.hh"
  36 #include "arch/sparc/isa_traits.hh"
  37 #include "arch/sparc/types.hh"
  38
  39 #include <string>
  40
  41 class Checkpoint;
  42
  43 namespace SparcISA
  44 {
  45     std::string getFloatRegName(RegIndex);
  46
  47     const int NumFloatArchRegs = 64;
  48     const int NumFloatRegs = 64;
  49
  50     typedef float float32_t;
  51     typedef double float64_t;
  52     //FIXME long double refers to a 10 byte float, rather than a
  53     //16 byte float as required. This data type may have to be emulated.
  54     typedef double float128_t;
  55
  56     class FloatRegFile
  57     {
  58       public:
  59         static const int SingleWidth = 32;
  60         static const int DoubleWidth = 64;
  61         static const int QuadWidth = 128;
  62
  63       protected:
  64
  65         //Since the floating point registers overlap each other,
  66         //A generic storage space is used. The float to be returned is
  67         //pulled from the appropriate section of this region.
  68         char regSpace[(SingleWidth / 8) * NumFloatRegs];
  69
  70       public:
  71
  72         void clear();
  73
  74         FloatReg readReg(int floatReg, int width);
  75
  76         FloatRegBits readRegBits(int floatReg, int width);
  77
  78         Fault setReg(int floatReg, const FloatReg &val, int width);
  79
  80         Fault setRegBits(int floatReg, const FloatRegBits &val, int width);
  81
  82         void serialize(std::ostream &os);
  83
  84         void unserialize(Checkpoint *cp, const std::string &section);
  85     };
  86 }
  87
  88 #endif