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/*

 * Project: S.Ha.R.K.

 *

 * Coordinators:

 *   Giorgio Buttazzo    <giorgio@sssup.it>

 *   Paolo Gai           <pj@gandalf.sssup.it>

 *

 * Authors     :

 *   Paolo Gai           <pj@gandalf.sssup.it>

 *   (see the web pages for full authors list)

 *

 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)

 *

 * http://www.sssup.it

 * http://retis.sssup.it

 * http://shark.sssup.it

 */

/**

 ------------

 CVS :        $Id: jet.c,v 1.3 2005-01-08 14:47:16 pj Exp $

 File:        $File$

 Revision:    $Revision: 1.3 $

 Last update: $Date: 2005-01-08 14:47:16 $

 ------------

 Kernel Job Execution Time functions

 This file contains:

 jet_delstat

 jet_getstat

 jet_gettable

 jet_update_endcycle

 jet_update_slice

**/

/*

 * Copyright (C) 2000 Paolo Gai

 *

 * 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 2 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, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 */

#include <stdarg.h>

#include <ll/ll.h>

#include <arch/stdlib.h>

#include <arch/stdio.h>

#include <arch/string.h>

#include <kernel/config.h>

#include <kernel/model.h>

#include <kernel/const.h>

#include <sys/types.h>

#include <kernel/types.h>

#include <kernel/descr.h>

#include <errno.h>

#include <kernel/var.h>

#include <kernel/func.h>

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

/* Jet management primitives                                           */

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

/*+ This primitive returns the maximum execution time and the total

    execution time from the task_create or the last jet_delstat

    It returns also the number of instances to use to calculate the mean

    time and the current job execution time.

    The value returned is 0 if all ok, -1 if the PID is not correct or

    the task doesn't have the JET_ENABLE bit set.

+*/

int jet_getstat(PID p, TIME *sum, TIME *max, int *n, TIME *curr)

{

  SYS_FLAGS f;

  f = kern_fsave();

  if (p<0 || p>=MAX_PROC ||

      !(proc_table[p].control & JET_ENABLED) ||

      proc_table[p].status == FREE) {

    kern_frestore(f);

    return -1;

  }

  if (sum != NULL)  *sum = proc_table[p].jet_sum;

  if (max != NULL)  *max = proc_table[p].jet_max;

  if (n != NULL)    *n   = proc_table[p].jet_n;

  if (curr != NULL) *curr= proc_table[p].jet_table[proc_table[p].jet_curr];

  kern_frestore(f);

  return 0;

}

/*+ This primitive reset to 0 the maximum execution time and the mean

    execution time of the task p, and reset to 0 all the entries in

    jet_table.

    The value returned is 0 if all ok, -1 if the PID is not correct or

    the task doesn't have the JET_ENABLE bit set.                     +*/

int jet_delstat(PID p)

{

  SYS_FLAGS f;

  f = kern_fsave();

  if (p<0 || p>=MAX_PROC ||

      !(proc_table[p].control & JET_ENABLED) ||

      proc_table[p].status == FREE) {

    kern_frestore(f);

    return -1;

  }

  proc_table[p].jet_sum = 0;

  proc_table[p].jet_n   = 0;

  proc_table[p].jet_max = 0;

  kern_frestore(f);

  return 0;

}

/*+ This primitive returns the last n values of the task execution time

    recorded after the last call to jet_gettable or jet_delstat.

    If n is

    <0 it will be set only the last values inserted in the table

       since the last call of jet_gettable.

    >0 it will be set up to JET_TABLE_DIM datas.

    The value returned is -1 if the PID is not correct or

    the task doesn't have the JET_ENABLE bit set, otherwise it returns the

    number of values set in the parameter table.

    (can be from 0 to JET_TABLE_DIM-1)

+*/

int jet_gettable(PID p, TIME *table, int n)

{

  int i;

  SYS_FLAGS f;

  f = kern_fsave();

  if (p<0 || p>=MAX_PROC ||

      !(proc_table[p].control & JET_ENABLED) ||

      proc_table[p].status == FREE) {

    kern_frestore(f);

    return -1;

  }

  /* Copy all the info to the user */

  if (n < 0) {

    n = proc_table[p].jet_tvalid;

    proc_table[p].jet_tvalid = 0;

  }

  else if (n > JET_TABLE_DIM-1)

    n = JET_TABLE_DIM-1;

  for (i=(proc_table[p].jet_curr + JET_TABLE_DIM - n) % JET_TABLE_DIM;

       i!= proc_table[p].jet_curr;

       i= (i+1) % JET_TABLE_DIM)

     *table++ = proc_table[p].jet_table[i];

  kern_frestore(f);

  return n;

}

/*+ This function updates the jet information. +*/

void jet_update_slice(TIME t)

{

  if (proc_table[exec_shadow].control & JET_ENABLED)

    proc_table[exec_shadow].jet_table[ proc_table[exec_shadow].jet_curr ]

      += t;

  if (TIMESPEC_A_LT_B(&schedule_time, &cap_lasttime)) {

      kern_printf("scheduletime %lus %luns * caplasttime %lus %luns * exec=%d TIME = %lu \n",

                schedule_time.tv_sec,schedule_time.tv_nsec,

                cap_lasttime.tv_sec,cap_lasttime.tv_nsec, exec_shadow, t);

      kern_raise(XUNSPECIFIED_EXCEPTION,exec_shadow);

  }

}

/*+ This function updates the jet information at the task end period

    it is called in task_endcycle and task_sleep +*/

void jet_update_endcycle()

{

  int s,n;

  if (proc_table[exec_shadow].control & JET_ENABLED) {

    s = proc_table[exec_shadow].jet_table[proc_table[exec_shadow].jet_curr];

    n = proc_table[exec_shadow].jet_n;

    if (proc_table[exec_shadow].jet_max < s)

      proc_table[exec_shadow].jet_max = s;

    proc_table[exec_shadow].jet_sum += s;

    proc_table[exec_shadow].jet_n = n+1;

    proc_table[exec_shadow].jet_curr = (proc_table[exec_shadow].jet_curr + 1)

      % JET_TABLE_DIM;

    proc_table[exec_shadow].jet_table[proc_table[exec_shadow].jet_curr] = 0;

    /* we update the tvalid field... */

    if (proc_table[exec_shadow].jet_tvalid < JET_TABLE_DIM)

      proc_table[exec_shadow].jet_tvalid++;

  }

}