src/arch/power/isa/bitfields.isa

   1 // -*- mode:c++ -*-
   2
   3 // Copyright (c) 2009 The University of Edinburgh
   4 // All rights reserved.
   5 //
   6 // Redistribution and use in source and binary forms, with or without
   7 // modification, are permitted provided that the following conditions are
   8 // met: redistributions of source code must retain the above copyright
   9 // notice, this list of conditions and the following disclaimer;
  10 // redistributions in binary form must reproduce the above copyright
  11 // notice, this list of conditions and the following disclaimer in the
  12 // documentation and/or other materials provided with the distribution;
  13 // neither the name of the copyright holders nor the names of its
  14 // contributors may be used to endorse or promote products derived from
  15 // this software without specific prior written permission.
  16 //
  17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28 //
  29 // Authors: Timothy M. Jones
  30
  31 ////////////////////////////////////////////////////////////////////
  32 //
  33 // Bitfield definitions.
  34 //
  35 // The endianness is the opposite to what's used here, so things
  36 // are reversed sometimes. Not sure of a fix to this though...
  37
  38 // Opcode fields
  39 def bitfield OPCODE        <31:26>;
  40 def bitfield X_XO          <10:0>;
  41 def bitfield XO_XO         <10:1>;
  42 def bitfield A_XO          <5:1>;
  43
  44 // Register fields
  45 def bitfield RA            <20:16>;
  46 def bitfield RB            <15:11>;
  47 def bitfield RS            <25:21>;
  48 def bitfield RT            <25:21>;
  49 def bitfield FRA           <20:16>;
  50 def bitfield FRB           <15:11>;
  51 def bitfield FRC           <10:6>;
  52 def bitfield FRS           <25:21>;
  53 def bitfield FRT           <25:21>;
  54
  55 // The record bit can be in two positions
  56 // Used to enable setting of the condition register
  57 def bitfield RC31          <0>;
  58 def bitfield RC21          <10>;
  59
  60 // Used to enable setting of the overflow flags
  61 def bitfield OE            <10>;
  62
  63 // SPR field for mtspr instruction
  64 def bitfield SPR           <20:11>;
  65
  66 // FXM field for mtcrf instruction
  67 def bitfield FXM           <19:12>;
  68
  69 // Branch fields
  70 def bitfield LK            <0>;
  71 def bitfield AA            <1>;
  72
  73 // Specifies a CR or FPSCR field
  74 def bitfield BF            <25:23>;
  75
  76 // Fields for FPSCR manipulation instructions
  77 def bitfield FLM           <24:17>;
  78 def bitfield L             <25>;
  79 def bitfield W             <16>;
  80 // Named so to avoid conflicts with range.hh
  81 def bitfield U_FIELD       <15:12>;
  82
  83 // Field for specifying a bit in CR or FPSCR
  84 def bitfield BT            <25:21>;