/*****************************************************************************

  The following code is derived, directly or indirectly, from the SystemC
  source code Copyright (c) 1996-2004 by all Contributors.
  All Rights reserved.

  The contents of this file are subject to the restrictions and limitations
  set forth in the SystemC Open Source License Version 2.4 (the "License");
  You may not use this file except in compliance with such restrictions and
  limitations. You may obtain instructions on how to receive a copy of the
  License at http://www.systemc.org/. Software distributed by Contributors
  under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
  ANY KIND, either express or implied. See the License for the specific
  language governing rights and limitations under the License.

 *****************************************************************************/

/*****************************************************************************
 
  dcache.h -- Data Cache Unit.
 
  Original Author: Martin Wang, Synopsys, Inc.
 
 *****************************************************************************/
 
/*****************************************************************************
 
  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.
 
      Name, Affiliation, Date:
  Description of Modification:
 
 *****************************************************************************/


struct dcache : sc_module { 
  	sc_in<signed> 		datain; 	// input data
  	sc_in<unsigned>  	statein; 	// input state bit MESI(=3210)
  	sc_in<bool>  		cs;    		// chip select
  	sc_in<bool>  		we;    		// write enable 
  	sc_in<unsigned >  	addr;  		// address
  	sc_in<unsigned>  	dest;    	// write back to which register
  	sc_out<unsigned>  	destout;    	// write back to which register
  	sc_out<signed>  	dataout;  	// dataram data out
  	sc_out<bool>  		out_valid;    	// output valid
  	sc_out<unsigned>  	stateout;  	// state output
        sc_in_clk 		CLK;


  // Parameter
  unsigned *dmemory;	 				// data memory
  unsigned *dsmemory;	 				// data state memory
  unsigned *dtagmemory;	 				// tag memory
  int wait_cycles; 					// cycles # it takes to access dmemory

  void init_param(int given_delay_cycles) {
    wait_cycles = given_delay_cycles; 
  }
 
  //Constructor 
  SC_CTOR(dcache) {
        SC_CTHREAD(entry, CLK.pos());

	// initialize instruction dmemory from external file
	FILE *fp = fopen("dcache","r");
	int size=0;
	int i=0;
	int mem_word;
  	dmemory = new unsigned[4000];
  	dsmemory = new unsigned[4000];
  	dtagmemory = new unsigned[4000];
	printf("** ALERT ** DCU: initialize Data Cache\n");
	while (fscanf(fp,"%x", &mem_word) != EOF) {
		dmemory[size] = mem_word;
		dsmemory[size] = 0;
		dtagmemory[size] = size;
		size++;
	}
	for (i=size; i<4000; i++) {
		dtagmemory[i] = 0xdeadbeef;
		dmemory[i] = 0xdeadbeef;
		dsmemory[i] = 0;
	}
  }

  // Process functionality in member function below
  void entry();
};


