cpu.vh

   1 /*
   2  * Copyright 2018 Jacob Lifshay
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in all
  12  * copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  * SOFTWARE.
  21  *
  22  */
  23 `ifndef cpu_vh_
  24 `define cpu_vh_
  25
  26 `define fetch_action [2:0]
  27
  28 `define fetch_action_default 3'h0
  29 `define fetch_action_fence 3'h1
  30 `define fetch_action_jump 3'h2
  31 `define fetch_action_wait 3'h3
  32 `define fetch_action_error_trap 3'h4
  33 `define fetch_action_noerror_trap 3'h5
  34 `define fetch_action_ack_trap 3'h6
  35
  36 `define fetch_output_state [1:0]
  37
  38 `define fetch_output_state_empty 2'h0
  39 `define fetch_output_state_valid 2'h1
  40 `define fetch_output_state_trap 2'h2
  41
  42 `define decode_action [11:0]
  43
  44 `define decode_action_trap_illegal_instruction 'h1
  45 `define decode_action_load 'h2
  46 `define decode_action_fence 'h4
  47 `define decode_action_fence_i 'h8
  48 `define decode_action_op_op_imm 'h10
  49 `define decode_action_lui_auipc 'h20
  50 `define decode_action_store 'h40
  51 `define decode_action_branch 'h80
  52 `define decode_action_jalr 'h100
  53 `define decode_action_jal 'h200
  54 `define decode_action_trap_ecall_ebreak 'h400
  55 `define decode_action_csr 'h800
  56
  57 `endif
  58