#include <stdio.h>
#include <syscall-nr.h>
#include "userprog/syscall.h"
#include "threads/interrupt.h"
#include "threads/thread.h"

/* header files you probably need, they are not used yet */
#include <string.h>
#include "filesys/filesys.h"
#include "filesys/file.h"
#include "threads/vaddr.h"
#include "threads/init.h"
#include "userprog/pagedir.h"
#include "userprog/process.h"
#include "devices/input.h"

static void syscall_handler (struct intr_frame *);

void
syscall_init (void) 
{
  intr_register_int (0x30, 3, INTR_ON, syscall_handler, "syscall");
}


/* This array defined the number of arguments each syscall expects.
   For example, if you want to find out the number of arguments for
   the read system call you shall write:
   
   int sys_read_arg_count = argc[ SYS_READ ];
   
   All system calls have a name such as SYS_READ defined as an enum
   type, see `lib/syscall-nr.h'. Use them instead of numbers.
 */
const int argc[] = {
  /* basic calls */
  0, 1, 1, 1, 2, 1, 1, 1, 3, 3, 2, 1, 1, 
  /* not implemented */
  2, 1,    1, 1, 2, 1, 1,
  /* extended */
  0
};

//static void
//syscall_handler (struct intr_frame *f) 
//{
//  int32_t* esp = (int32_t*)f->esp;
//  
//  switch ( 0 /* retrive syscall number */ )
//  {
//    default:
//    {
//      printf ("Executed an unknown system call!\n");
//      
//      printf ("Stack top + 0: %d\n", esp[0]);
//      printf ("Stack top + 1: %d\n", esp[1]);
//      
//      thread_exit ();
//    }
//  }
//}