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/*
 * Project: S.Ha.R.K.
 *
 * Coordinators:
 *   Giorgio Buttazzo    <giorgio@sssup.it>
 *   Paolo Gai           <pj@gandalf.sssup.it>
 *
 * Authors     :
 *   Giacomo Guidi       <giacomo@gandalf.sssup.it>
 *
 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
 *
 * http://www.sssup.it
 * http://retis.sssup.it
 * http://shark.sssup.it
 */

/*
 * 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
 */

/*
 * Advanced Timer Demo
 *
 */

#include "kernel/kern.h"
#include "ll/i386/cons.h"
#include "ll/i386/advtimer.h"

#include "drivers/shark_keyb26.h"

#define UPDATE_PERIOD   10000
#define UPDATE_WCET     1000

extern unsigned int clk_per_msec;
extern unsigned int apic_clk_per_msec;

void program_key_end(KEY_EVT *k)
{

  sys_end();

}

TASK Update(void *arg)
{  
  struct timespec actual_timer;
 
  long nsec,sec,min,hrs,day;
  long mean_delay,tot_delay,num_delay;

  signed long long start,end,res;
  struct timespec s_test,startts,endts;

  task_nopreempt();

  num_delay = tot_delay = mean_delay = 0;

  while (1) {

        if (clk_per_msec != 0) {

          rdtscll(start);
          sys_gettime(&actual_timer);
          rdtscll(end);
          res = end - start;
          rdtscll(start);
          rdtscll(end);
          res -= (end - start);
          s_test.tv_nsec = res * 1000000 / clk_per_msec;


        } else {

          sys_gettime(&startts);
          sys_gettime(&actual_timer);
          sys_gettime(&endts);
          SUBTIMESPEC(&endts,&startts,&s_test);
          sys_gettime(&startts);
          sys_gettime(&endts);
          SUBTIMESPEC(&endts,&startts,&endts);
          SUBTIMESPEC(&s_test,&endts,&s_test);

        }

        if (tot_delay < 1000000000) {
          tot_delay += s_test.tv_nsec;
          num_delay ++;
          mean_delay = tot_delay / num_delay;
        }
         
        nsec = actual_timer.tv_nsec;
        sec = actual_timer.tv_sec;
        min = sec / 60;
        sec %= 60;
        hrs = min / 60;
        min %= 60;
        day = hrs / 24;
        hrs %= 24;
       
        printf_xy(0,5,WHITE,"Actual CPU Clk/msec:  %12d",clk_per_msec);
        printf_xy(0,6,WHITE,"Actual APIC Clk/msec: %12d",apic_clk_per_msec);  
        printf_xy(0,7,WHITE,"Actual Timer: %2ld d %2ld h %2ld m %2ld s %12ld ns",day,hrs,min,sec,(long)nsec);

        printf_xy(0,9,WHITE,"Timer Access Delay: %12ld ns",mean_delay);
       
        task_endcycle();

  }

  sys_end();
 
}

void set_screen()
{

        printf_xy(20,0,WHITE,"          Advanced Timer Demo           ");
        printf_xy(20,1,WHITE,"Giacomo Guidi <giacomo@gandalf.sssup.it>");
        printf_xy(20,2,WHITE,"         Press Alt + c to exit          ");
       
}
                               
                               
int main(int argc, char **argv)
{
       
  HARD_TASK_MODEL   mp; //Show current setting
  PID               update;
  KEY_EVT           k;
 
  k.flag = ALTL_BIT;
  k.scan = KEY_C;
  k.ascii = 'c';
  k.status = KEY_PRESSED;
  keyb_hook(k,program_key_end,FALSE);

  set_screen();
 
  hard_task_default_model(mp);
  hard_task_def_ctrl_jet(mp);
  hard_task_def_group(mp, 1);
  hard_task_def_wcet(mp,UPDATE_WCET);
  hard_task_def_mit(mp,UPDATE_PERIOD);
  hard_task_def_usemath(mp);
  update = task_create("Update", Update, &mp, NULL);
  if (update != NIL) task_activate(update);

  return 0;

}