cpudefs.py

   1 """
   2 /*
   3  * Copyright 2018 Jacob Lifshay
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to deal
   7  * in the Software without restriction, including without limitation the rights
   8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9  * copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in all
  13  * copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  */
  24 """
  25
  26 from migen import Constant
  27 fetch_action = 3
  28
  29 class FA:
  30     """ Fetch action constants
  31     """
  32     default = Constant(0x0, fetch_action)
  33     fence = Constant(0x1, fetch_action)
  34     jump = Constant(0x2, fetch_action)
  35     wait = Constant(0x3, fetch_action)
  36     error_trap = Constant(0x4, fetch_action)
  37     noerror_trap = Constant(0x5, fetch_action)
  38     ack_trap = Constant(0x6, fetch_action)
  39
  40 fetch_output_state = 2
  41
  42 class FOS:
  43     """ Fetch output state constants
  44     """
  45     empty = Constant(0x0, fetch_output_state)
  46     valid = Constant(0x1, fetch_output_state)
  47     trap = Constant(0x2, fetch_output_state)
  48
  49 decode_action = 12
  50
  51 class DA:
  52     """ Decode action constants
  53     """
  54     trap_illegal_instruction = Constant(0x1, decode_action)
  55     load = Constant(0x2, decode_action)
  56     fence = Constant(0x4, decode_action)
  57     fence_i = Constant(0x8, decode_action)
  58     op_op_imm = Constant(0x10, decode_action)
  59     lui_auipc = Constant(0x20, decode_action)
  60     store = Constant(0x40, decode_action)
  61     branch = Constant(0x80, decode_action)
  62     jalr = Constant(0x100, decode_action)
  63     jal = Constant(0x200, decode_action)
  64     trap_ecall_ebreak = Constant(0x400, decode_action)
  65     csr = Constant(0x800, decode_action)