icache.cpp

来自「system C源码 一种替代verilog的语言」· C++ 代码 · 共 104 行

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

  The following code is derived, directly or indirectly, from the SystemC
  source code Copyright (c) 1996-2006 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.

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

/*****************************************************************************
 
  icache.cpp -- Instruction 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: Gene Bushuyev, Synopsys, Inc.
  Description of Modification: - bug - read/write outside of allocated memory
 
      Name, Affiliation, Date:
  Description of Modification:

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


#include "systemc.h"
#include "icache.h"
#include "directive.h"


void icache::entry()
{
    unsigned int 	address;

 while (true) {
    	do { wait(); } while ( !(cs == true) ); 
    	address = addr.read();
	if (address == BOOT_LENGTH) {
		 printf("ICU ALERT: *********************************************************************\n");
		 printf("         : *****************************AFTER RESET*****************************\n");
		 printf("ICU ALERT: *********************************************************************\n");
	}
	if (address >= BOOT_LENGTH) {
		if (ld_valid.read() == true) {
			pid = ld_data.read();
			printf("------------------------\n");
			printf("ICU: PID = [%d]", pid); 
                       	cout << " at CSIM " << sc_time_stamp() << endl;
			printf("------------------------\n");
      			wait();
      			wait();
		}
    		if (we.read() == true) { // Write operation
      			wait();
			if (address < MAX_CODE_LENGTH && address >= 0)
                          icmemory[address] = datain.read();
                        else
                          printf("ICU ALERT: **MEMORY OUT OF RANGE**\n");
      			wait();
    		}
    		else { // Read operation
			wait(); // Introduce delay needed
			if (address >= MAX_CODE_LENGTH || address < 0) {
				dataout.write(0xffffffff);
				printf("ICU ALERT: **MEMORY OUT OF RANGE**\n");
			}
                        else
        		  dataout.write(icmemory[address]);

			icache_valid.write(true);

			if (PRINT_ICU) {
				printf("------------------------\n");
				printf("ICU: fetching mem[%d]\n", address);
                                if (address < MAX_CODE_LENGTH && address >= 0) 
				  printf("ICU: (%0x)", icmemory[address]); 
       		                cout.setf(ios::dec,ios::basefield);
                        	cout << " at CSIM " << sc_time_stamp() << endl;
				printf("------------------------\n");
			}

      			wait();
			icache_valid.write(false);
      			wait();
    		}    
	}
 }
} // end of entry function