The main thread, run, invokes the Or1ksim ISS to run for ever (by passing a negative time argument). The ISS will use the upcalls (see Section 4.2.6) to request reads from and writes to the peripheral address space.

The thread is called automatically when the SystemC kernel has completed elaboration (i.e. is initialized).

void
Or1ksimSC::run()
{
  scLastUpTime   = sc_core::sc_time_stamp();
  or1kLastUpTime = or1ksim_time();

  (void)or1ksim_run( -1.0 );

}       // Or1ksimSC()