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/* libtoplevel.c -- Top level simulator library source file

   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org

   Copyright (C) 2008 Embecosm Limited

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

   This file is part of OpenRISC 1000 Architectural Simulator.

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

   under the terms of the GNU 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 General Public License for

   more details.

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

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

/* This program is commented throughout in a fashion suitable for processing

   with Doxygen. */

/* Autoconf and/or portability configuration */

#include "config.h"

/* System includes */

#include <stdlib.h>

#include <unistd.h>

#include <signal.h>

/* Package includes */

#include "or1ksim.h"

#include "sim-config.h"

#include "toplevel-support.h"

#include "sched.h"

#include "execute.h"

#include "pic.h"

/*---------------------------------------------------------------------------*/

/*!Initialize the simulator.

   Allows specification of an (optional) config file and an image file. Builds

   up dummy argc/argv to pass to the existing argument parser.

   @param[in] config_file  Or1ksim configuration file name

   @param[in] image_file   The program image to execute

   @param[in] class_ptr    Pointer to a C++ class instance (for use when

                           called by C++)

   @param[in] upr          Upcall routine for reads

   @param[in] upw          Upcall routine for writes

   @return  0 on success and an error code on failure                        */

/*---------------------------------------------------------------------------*/

int

or1ksim_init (const char *config_file,

              const char *image_file,

              void       *class_ptr,

              unsigned long int (*upr) (void *class_ptr,

                                        unsigned long int addr,

                                        unsigned long int mask),

              void (*upw) (void *class_ptr,

                           unsigned long int addr,

                           unsigned long int mask, unsigned long int wdata))

{

  int   dummy_argc;

  char *dummy_argv[4];

  /* Dummy argv array. Varies depending on whether an image file is

     specified. */

  dummy_argv[0] = "libsim";

  dummy_argv[1] = "-f";

  dummy_argv[2] = (char *) ((NULL != config_file) ? config_file : "sim.cfg");

  dummy_argv[3] = (char *) image_file;

  dummy_argc = (NULL == image_file) ? 3 : 4;

  /* Initialization copied from existing main() */

  srand (getpid ());

  init_defconfig ();

  reg_config_secs ();

  if (parse_args (dummy_argc, dummy_argv))

    {

      return OR1KSIM_RC_BADINIT;

    }

  config.sim.profile   = 0;      /* No profiling */

  config.sim.mprofile  = 0;

  config.ext.class_ptr = class_ptr;     /* SystemC linkage */

  config.ext.read_up   = upr;

  config.ext.write_up  = upw;

  print_config ();              /* Will go eventually */

  signal (SIGINT, ctrl_c);      /* Not sure we want this really */

  runtime.sim.hush = 1;         /* Not sure if this is needed */

  do_stats = config.cpu.superscalar ||

             config.cpu.dependstats ||

             config.sim.history     ||

             config.sim.exe_log;

  sim_init ();

  runtime.sim.ext_int_set = 0;   /* No interrupts pending to be set */

  runtime.sim.ext_int_clr = 0;   /* No interrupts pending to be cleared */

  return OR1KSIM_RC_OK;

}       /* or1ksim_init() */

/*---------------------------------------------------------------------------*/

/*!Run the simulator

   The argument is a time in seconds, which is converted to a number of

   cycles, if positive. A negative value means "run for ever".

   The semantics are that the duration for which the run may occur may be

   changed mid-run by a call to or1ksim_reset_duration(). This is to allow for

   the upcalls to generic components adding time, and reducing the time

   permitted for ISS execution before synchronization of the parent SystemC

   wrapper.

   This is over-ridden if the call was for a negative duration, which means

   run forever!

   Uses a simplified version of the old main program loop. Returns success if

   the requested number of cycles were run and an error code otherwise.

   @param[in] duration  Time to execute for (seconds)

   @return  OR1KSIM_RC_OK if we run to completion, OR1KSIM_RC_BRKPT if we hit

            a breakpoint (not clear how this can be set without CLI access)  */

/*---------------------------------------------------------------------------*/

int

or1ksim_run (double duration)

{

  const int  num_ints = sizeof (runtime.sim.ext_int_set) * 8;

  or1ksim_reset_duration (duration);

  /* Loop until we have done enough cycles (or forever if we had a negative

     duration) */

  while (duration < 0.0 || (runtime.sim.cycles < runtime.sim.end_cycles))

    {

      long long int time_start = runtime.sim.cycles;

      int i;                    /* Interrupt # */

      /* Each cycle has counter of mem_cycles; this value is joined with cycles

       * at the end of the cycle; no sim originated memory accesses should be

       * performed inbetween.

       */

      runtime.sim.mem_cycles = 0;

      if (cpu_clock ())

        {

          return OR1KSIM_RC_BRKPT;      /* Hit a breakpoint */

        }

      runtime.sim.cycles += runtime.sim.mem_cycles;

      /* Take any external interrupts. Outer test is for the common case for

         efficiency. */

      if (0 != runtime.sim.ext_int_set)

        {

          for (i = 0; i < num_ints; i++)

            {

              if (0x1 == ((runtime.sim.ext_int_set >> i) & 0x1))

                {

                  report_interrupt (i);

                  runtime.sim.ext_int_set &= ~(1 << i); /* Clear req flag */

                }

            }

        }

      /* Clear any interrupts as requested. For edge triggered interrupts this

         will happen in the same cycle. For level triggered, it must be an

         explicit call. */

      if (0 != runtime.sim.ext_int_clr)

        {

          for (i = 0; i < num_ints; i++)

            {

              /* Only clear interrupts that have been explicitly cleared */

              if(0x1 == ((runtime.sim.ext_int_clr >> i) & 0x1))

                {

                  clear_interrupt(i);

                  runtime.sim.ext_int_clr &= ~(1 << i); /* Clear clr flag */

                }

            }

        }

      /* Update the scheduler queue */

      scheduler.job_queue->time -= (runtime.sim.cycles - time_start);

      if (scheduler.job_queue->time <= 0)

        {

          do_scheduler ();

        }

    }

  return  OR1KSIM_RC_OK;

}       /* or1ksim_run() */

/*---------------------------------------------------------------------------*/

/*!Reset the run-time simulation end point

  Reset the time for which the simulation should run to the specified duration

  from NOW (i.e. NOT from when the run started).

  @param[in] duration  Time to run for in seconds                            */

/*---------------------------------------------------------------------------*/

void

or1ksim_reset_duration (double duration)

{

  runtime.sim.end_cycles =

    runtime.sim.cycles +

    (long long int) (duration * 1.0e12 / (double) config.sim.clkcycle_ps);

}       /* or1ksim_reset_duration() */

/*---------------------------------------------------------------------------*/

/*!Return time executed so far

   Internal utility to return the time executed so far. Note that this is a

   re-entrant routine.

   @return  Time executed so far in seconds                                  */

/*---------------------------------------------------------------------------*/

static double

internal_or1ksim_time ()

{

  return (double) runtime.sim.cycles * (double) config.sim.clkcycle_ps /

    1.0e12;

}       // or1ksim_cycle_count()

/*---------------------------------------------------------------------------*/

/*!Mark a time point in the simulation

   Sets the internal parameter recording this point in the simulation        */

/*---------------------------------------------------------------------------*/

void

or1ksim_set_time_point ()

{

  runtime.sim.time_point = internal_or1ksim_time ();

}       /* or1ksim_set_time_point() */

/*---------------------------------------------------------------------------*/

/*!Return the time since the time point was set

  Get the value from the internal parameter                                  */

/*---------------------------------------------------------------------------*/

double

or1ksim_get_time_period ()

{

  return internal_or1ksim_time () - runtime.sim.time_point;

}       /* or1ksim_get_time_period() */

/*---------------------------------------------------------------------------*/

/*!Return the endianism of the model

   Note that this is a re-entrant routine.

   @return 1 if the model is little endian, 0 otherwise.                     */

/*---------------------------------------------------------------------------*/

int

or1ksim_is_le ()

{

#ifdef OR32_BIG_ENDIAN

  return 0;

#else

  return 1;

#endif

}       /* or1ksim_is_le() */

/*---------------------------------------------------------------------------*/

/*!Return the clock rate

   Value is part of the configuration

   @return  Clock rate in Hz.                                                */

/*---------------------------------------------------------------------------*/

unsigned long int

or1ksim_clock_rate ()

{

  return (unsigned long int) (1000000000000ULL /

                              (unsigned long long int) (config.sim.

                                                        clkcycle_ps));

}       /* or1ksim_clock_rate() */

/*---------------------------------------------------------------------------*/

/*!Trigger an edge triggered interrupt

   This function is appropriate for edge triggered interrupts, which are taken

   and then immediately cleared.

   @note There is no check that the specified interrupt number is reasonable

   (i.e. <= 31).

   @param[in] i  The interrupt number                                        */

/*---------------------------------------------------------------------------*/

void

or1ksim_interrupt (int i)

{

  if (!config.pic.edge_trigger)

    {

      fprintf (stderr, "Warning: or1ksim_interrupt should not be used for "

               "edge triggered interrupts. Ignored\n");

    }

  else

    {

      runtime.sim.ext_int_set |= 1 << i;        // Better not be > 31!

      runtime.sim.ext_int_clr |= 1 << i;        // Better not be > 31!

    }

}       /* or1ksim_interrupt() */

/*---------------------------------------------------------------------------*/

/*!Set a level triggered interrupt

   This function is appropriate for level triggered interrupts, which must be

   explicitly cleared in a separate call.

   @note There is no check that the specified interrupt number is reasonable

   (i.e. <= 31).

   @param[in] i  The interrupt number to set                                 */

/*---------------------------------------------------------------------------*/

void

or1ksim_interrupt_set (int i)

{

  if (config.pic.edge_trigger)

    {

      fprintf (stderr, "Warning: or1ksim_interrupt_set should not be used for "

               "level triggered interrupts. Ignored\n");

    }

  else

    {

      runtime.sim.ext_int_set |= 1 << i;        // Better not be > 31!

    }

}       /* or1ksim_interrupt() */

/*---------------------------------------------------------------------------*/

/*!Clear a level triggered interrupt

   This function is appropriate for level triggered interrupts, which must be

   explicitly set first in a separate call.

   @note There is no check that the specified interrupt number is reasonable

   (i.e. <= 31).

   @param[in] i  The interrupt number to clear                               */

/*---------------------------------------------------------------------------*/

void

or1ksim_interrupt_clear (int i)

{

  if (config.pic.edge_trigger)

    {

      fprintf (stderr, "Warning: or1ksim_interrupt_clear should not be used "

               "for level triggered interrupts. Ignored\n");

    }

  else

    {

      runtime.sim.ext_int_clr |= 1 << i;        // Better not be > 31!

    }

}       /* or1ksim_interrupt() */