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// ----------------------------------------------------------------------------

// SystemC OpenRISC 1200 Monitor: implementation

// Copyright (C) 2008  Embecosm Limited <info@embecosm.com>

// Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

// Contributor Julius Baxter <jb@orsoc.se>

// This file is part of the cycle accurate model of the OpenRISC 1000 based

// system-on-chip, ORPSoC, built using Verilator.

// This program is free software: you can redistribute it and/or modify it

// under the terms of the GNU Lesser General Public License as published by

// the Free Software Foundation, either version 3 of the License, or (at your

// option) any later version.

// This program is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public

// License for more details.

// You should have received a copy of the GNU Lesser General Public License

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// ----------------------------------------------------------------------------

// $Id: Or1200MonitorSC.cpp 303 2009-02-16 11:20:17Z jeremy $

#include <iostream>

#include <iomanip>

#include <fstream>

using namespace std;

#include "Or1200MonitorSC.h"

#include "OrpsocMain.h"

SC_HAS_PROCESS( Or1200MonitorSC );

//! Constructor for the OpenRISC 1200 monitor

//! @param[in] name  Name of this module, passed to the parent constructor.

//! @param[in] accessor  Accessor class for this Verilated ORPSoC model

Or1200MonitorSC::Or1200MonitorSC (sc_core::sc_module_name   name,

                                  OrpsocAccess             *_accessor,

                                  int argc,

                                  char *argv[]) :

  sc_module (name),

  accessor (_accessor)

{

  // If not -log option, then don't log

  string logfileDefault("vlt-executed.log");

  string logfileNameString;

  exit_perf_summary_enabled = 1; // Simulation exit performance summary is 

                                 // on by default. Turn off with "-q" on the cmd line

  // Parse the command line options

  int cmdline_name_found=0;

  if (argc > 1)

    {

      // Search through the command line parameters for the "-log" option

      for(int i=1; i < argc; i++)

        {

          if ((strcmp(argv[i], "-l")==0) ||

              (strcmp(argv[i], "--log")==0))

            {

              logfileNameString = (argv[i+1]);

              cmdline_name_found=1;

              break;

            }

        }

      // Search through the command line parameters for the "-q","--no-perf-summary" option

      for(int i=1; i < argc; i++)

        {

          if ((strcmp(argv[i], "-q")==0) ||

              (strcmp(argv[i], "--quiet")==0))

            {

              exit_perf_summary_enabled = 0;

              break;

            }

        }

    }

  if(cmdline_name_found==1) // No -log option specified so don't turn on logging

    {

      logging_enabled = 0; // Default is logging disabled      

      statusFile.open(logfileNameString.c_str(), ios::out ); // open file to write to it

      if(statusFile.is_open())

        {

          // If we could open the file then turn on logging

          logging_enabled = 1;

          cout << "* Processor execution logged to file: " << logfileNameString << endl;

        }

    }

  SC_METHOD (displayState);

  sensitive << clk.pos();

  dont_initialize();

  start = clock();

  // checkInstruction monitors the bus for special NOP instructionsl

  SC_METHOD (checkInstruction);

  sensitive << clk.pos();

  dont_initialize();

}       // Or1200MonitorSC ()

//! Print command line switches for the options of this module

void

Or1200MonitorSC::printSwitches()

{

  printf(" [-l <file>] [-q]");

}

//! Print usage for the options of this module

void

Or1200MonitorSC::printUsage()

{

  printf("  -l, --log\t\tLog processor execution to file\n");

  printf("  -q, --quiet\t\tDisable the performance summary at end of simulation\n");

}

//! Method to handle special instrutions

//! These are l.nop instructions with constant values. At present the

//! following are implemented:

//! - l.nop 1  Terminate the program

//! - l.nop 2  Report the value in R3

//! - l.nop 3  Printf the string with the arguments in R3, etc

//! - l.nop 4  Print a character

extern int SIM_RUNNING;

void

Or1200MonitorSC::checkInstruction()

{

  uint32_t  r3;

  double    ts;

  // Check the instruction when the freeze signal is low.

  if (!accessor->getWbFreeze())

    {

      // Do something if we have l.nop

      switch (accessor->getWbInsn())

        {

        case NOP_EXIT:

          r3 = accessor->getGpr (3);

          ts = sc_time_stamp().to_seconds() * 1000000000.0;

          std::cout << std::fixed << std::setprecision (2) << ts;

          std::cout << " ns: Exiting (" << r3 << ")" << std::endl;

          perfSummary();

          if (logging_enabled != 0) statusFile.close();

          SIM_RUNNING=0;

          sc_stop();

          break;

        case NOP_REPORT:

          ts = sc_time_stamp().to_seconds() * 1000000000.0;

          r3 = accessor->getGpr (3);

          std::cout << std::fixed << std::setprecision (2) << ts;

          std::cout << " ns: report (" << hex << r3 << ")" << std::endl;

          break;

        case NOP_PRINTF:

          ts = sc_time_stamp().to_seconds() * 1000000000.0;

          std::cout << std::fixed << std::setprecision (2) << ts;

          std::cout << " ns: printf" << std::endl;

          break;

        case NOP_PUTC:

          r3 = accessor->getGpr (3);

          std::cout << (char)r3 << std::flush;

          break;

        default:

          break;

        }

    }

}       // checkInstruction()

//! Method to output the state of the processor

//! This function will output to a file, if enabled, the status of the processor

//! For now, it's just the PPC and instruction.

#define PRINT_REGS 0

void

Or1200MonitorSC::displayState()

{

  uint32_t  wbinsn;

  // Calculate how many instructions we've actually calculated by ignoring cycles where we're frozen, delay slots and flushpipe cycles

  if ((!accessor->getWbFreeze()) && !(accessor->getExceptFlushpipe() && accessor->getExDslot()))

        // Increment instruction counter

        insn_count++;

  if (logging_enabled == 0)

        return; // If we didn't inialise a file, then just return.

  // Output the state if we're not frozen and not flushing during a delay slot

  if ((!accessor->getWbFreeze()) && !(accessor->getExceptFlushpipe() && accessor->getExDslot()))

    {

        // Print PC, instruction

        statusFile << "\nEXECUTED("<< std::setfill(' ') << std::setw(11) << dec << insn_count << "): " << std::setfill('0') << hex << std::setw(8) << accessor->getWbPC() << ": " << hex << accessor->getWbInsn() <<  endl;

#if PRINT_REGS

        // Print general purpose register contents

        for (int i=0; i<32; i++)

          {

                if ((i%4 == 0)&&(i>0)) statusFile << endl;

                statusFile << std::setfill('0');

                statusFile << "GPR" << dec << std::setw(2) << i << ": " <<  hex << std::setw(8) << (uint32_t) accessor->getGpr(i) << "  ";

        }

        statusFile << endl;

        statusFile << "SR   : " <<  hex << std::setw(8) << (uint32_t) accessor->getSprSr() << "  ";

        statusFile << "EPCR0: " <<  hex << std::setw(8) << (uint32_t) accessor->getSprEpcr() << "  ";

        statusFile << "EEAR0: " <<  hex << std::setw(8) << (uint32_t) accessor->getSprEear() << "  ";

        statusFile << "ESR0 : " <<  hex << std::setw(8) << (uint32_t) accessor->getSprEsr() << endl;

#endif

    }

  return;

}       // displayState()

//! Function to calculate the number of instructions performed and the time taken

void

Or1200MonitorSC::perfSummary()

{

  if (exit_perf_summary_enabled)

    {

      double ts;

      ts = sc_time_stamp().to_seconds() * 1000000000.0;

      int cycles = ts / (BENCH_CLK_HALFPERIOD*2); // Number of clock cycles we had

      clock_t finish = clock();

      double elapsed_time = (double(finish)-double(start))/CLOCKS_PER_SEC;

      // It took elapsed_time seconds to do insn_count instructions. Divide insn_count by the time to get instructions/second.

      double ips = (insn_count/elapsed_time);

      double mips = (insn_count/elapsed_time)/1000000;

      int hertz = (int) ((cycles/elapsed_time)/1000);

      std::cout << "* Or1200Monitor: simulated " << sc_time_stamp() << ",time elapsed: " << elapsed_time << " seconds" << endl;

      std::cout << "* Or1200Monitor: simulated " << dec << cycles << " clock cycles, executed at approx " << hertz << "kHz" << endl;

      std::cout << "* Or1200Monitor: simulated " << insn_count << " instructions, insn/sec. = " << ips << ", mips = " << mips << endl;

    }

  return;

}       // perfSummary