///////////////////////////////////////////
// ieu.sv
//
// Written: David_Harris@hmc.edu 9 January 2021
// Modified: 
//
// Purpose: Integer Execution Unit: datapath and controller
// 
// A component of the Wally configurable RISC-V project.
// 
// Copyright (C) 2021 Harvey Mudd College & Oklahoma State University
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, 
// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software 
// is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT 
// OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
///////////////////////////////////////////

`include "wally-config.vh"

module ieu (
  input  logic            clk, reset,
  output logic [`XLEN-1:0] PCF,
  input  logic [31:0]     InstrF,
  output logic [1:0]      MemRWM,
  output logic [7:0]      ByteMaskM,
  output logic [`XLEN-1:0] ALUResultM, WriteDataM,
  input  logic [`XLEN-1:0] ReadDataM,
  input  logic            DataAccessFaultM,
  input  logic [1:0]      ForwardAE, ForwardBE,
  input  logic            StallF, StallD, FlushD, FlushE, FlushM, FlushW,
  output logic        PCSrcE,
  output logic        RegWriteM,
  output logic 	     MemReadE,
  output logic        RegWriteW,
  output logic        CSRWriteM, PrivilegedM,
  output logic        CSRWritePendingDEM,
  output logic [31:0]     InstrM,
  output logic [`XLEN-1:0] SrcAM,
  output logic [`XLEN-1:0] PCM,
  input  logic [`XLEN-1:0] CSRReadValM,
  input   logic [`XLEN-1:0] PrivilegedNextPCM, // *** eentually move to ifu
  output logic [`XLEN-1:0] InstrMisalignedAdrM,
  output logic InstrMisalignedFaultM,
  output logic LoadMisalignedFaultM, LoadAccessFaultM, // *** eventually move these to the memory interface, along with memdp
  output logic StoreMisalignedFaultM, StoreAccessFaultM,
  output  logic        IllegalIEUInstrFaultD,
  output logic [4:0] Rs1D, Rs2D, Rs1E, Rs2E, RdE, RdM, RdW,
  output logic       FloatRegWriteW,
  output logic       InstrValidW,
  input  logic        RetM, TrapM,
  input logic        LoadStallD

);

  logic [2:0]  Funct3D;
  logic        Funct7b5D;
  logic [6:0]  OpD;
  logic [2:0]  ImmSrcD;
  logic        IllegalCompInstrD;
  logic [2:0]  FlagsE;
  logic [4:0]  ALUControlE;
  logic        ALUSrcAE, ALUSrcBE;
  logic        IllegalInstrFaultM;
  logic [2:0]  Funct3M;
  logic [1:0]  ResultSrcW;

  logic       TargetSrcE;
           
  controller c(.*);
  datapath   dp(.*);             
endmodule