introduce Delay in MPC565 !!

Hi all,
   I am working with MPC565. and  i have made a routine which can introduce delay in  microseconds.
   
  Dummy Routine to Introduce Delay in MicroSeconds :
  -----------------------------------------------------------------------
  micro_second_delay( int  microsecs )
{
  int  time_base_start = get_tb_time();
   
     //Keep wait until the parameter 
     while( ( get_tb_time() - time_base_start ) < microsecs );  
  }

  get_tb_time ( void )
{
    mftb    r3,TB           
  }
  -------------------------------------------------------------------------
  Is it possible to have a function which can introduce delay in nanoseconds  ?
  i know that ,TB register is 64-bit incrementing counter. 
  how will i be able to manage to get specific delay ? Can i make generic funtions ?
   
    
  Thanks in advance 
   
  Praven 
   
   
   

 		
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