//------------------------------------------------- // start - called by interface_pre_start so we // can set ourselves up //------------------------------------------------- public void start(device_execute_interface execute, int linenum) { m_execute = execute; m_linenum = linenum; reset(); device_t device = m_execute.device(); device.save_item(m_stored_vector, "m_stored_vector", m_linenum); device.save_item(m_curvector, "m_curvector", m_linenum); device.save_item(m_curstate, "m_curstate", m_linenum); }
//------------------------------------------------- // set_state_synced - enqueue an event for later // execution via timer //------------------------------------------------- public void set_state_synced(int state, UInt32 vector = USE_STORED_VECTOR) { LOG("set_state_synced('{0}',{1},{2},{3})\n", m_execute.device().tag(), m_linenum, state, vector); if (TEMPLOG) { osd_printf_info("setline({0},{1},{2},{3})\n", m_execute.device().tag(), m_linenum, state, (vector == USE_STORED_VECTOR) ? 0 : vector); } assert(state == (int)line_state.ASSERT_LINE || state == (int)line_state.HOLD_LINE || state == (int)line_state.CLEAR_LINE); // if we're full of events, flush the queue and log a message int event_index = m_qindex++; if (event_index >= m_queue.Length) { m_qindex--; empty_event_queue(); event_index = m_qindex++; m_execute.device().logerror("Exceeded pending input line event queue on device '{0}'!\n", m_execute.device().tag()); } // enqueue the event if (event_index < m_queue.Length) { if (vector == USE_STORED_VECTOR) { vector = (UInt32)m_stored_vector; } m_queue[event_index] = (int)(((UInt32)state & 0xff) | (vector << 8)); // if this is the first one, set the timer if (event_index == 0) { m_execute.scheduler().synchronize(empty_event_queue, 0, this); } } }
// execution //------------------------------------------------- // timeslice - execute all devices for a single // timeslice //------------------------------------------------- public void timeslice() { bool call_debugger = (machine().debug_flags & DEBUG_FLAG_ENABLED) != 0; // build the execution list if we don't have one yet //if (UNEXPECTED(m_execute_list == null)) if (m_execute_list == null) { rebuild_execute_list(); } // if the current quantum has expired, find a new one while (m_basetime >= m_quantum_list.first().expire()) { m_quantum_allocator.reclaim(m_quantum_list.detach_head()); } // loop until we hit the next timer while (m_basetime < m_timer_list.expire()) { // by default, assume our target is the end of the next quantum attotime target = m_basetime + new attotime(0, m_quantum_list.first().actual()); // however, if the next timer is going to fire before then, override if (m_timer_list.expire() < target) { target = m_timer_list.expire(); } if (machine().video().frame_update_count() % 1000 == 0) { //LOG(("------------------\n")); LOG("device_scheduler.timeslice() - cpu_timeslice: target = {0}, m_timer_list.expire: {1}\n", target.as_string(), m_timer_list.expire().as_string()); } // do we have pending suspension changes? if (m_suspend_changes_pending) { apply_suspend_changes(); } // loop over all CPUs for (device_execute_interface exec = m_execute_list; exec != null; exec = exec.m_nextexec) { // only process if this CPU is executing or truly halted (not yielding) // and if our target is later than the CPU's current time (coarse check) if ((exec.m_suspend == 0 || exec.m_eatcycles > 0) && target.seconds() >= exec.m_localtime.seconds()) //if (EXPECTED((exec->m_suspend == 0 || exec->m_eatcycles) && target.seconds() >= exec->m_localtime.seconds())) { // compute how many attoseconds to execute this CPU attoseconds_t delta = target.attoseconds() - exec.m_localtime.attoseconds(); if (delta < 0 && target.seconds() > exec.m_localtime.seconds()) { delta += ATTOSECONDS_PER_SECOND; } assert(delta == (target - exec.m_localtime).as_attoseconds()); if (exec.m_attoseconds_per_cycle == 0) { exec.m_localtime = target; } // if we have enough for at least 1 cycle, do the math else if (delta >= exec.m_attoseconds_per_cycle) { // compute how many cycles we want to execute int ran = exec.m_cycles_running = (int)divu_64x32((u64)delta >> exec.m_divshift, (u32)exec.m_divisor); if (machine().video().frame_update_count() % 1000 == 0) { LOG("device_scheduler.timeslice() - cpu '{0}': {1} ({2} cycles)\n", exec.device().tag(), delta, exec.m_cycles_running); } // if we're not suspended, actually execute if (exec.m_suspend == 0) { g_profiler.start(exec.m_profiler); // note that this global variable cycles_stolen can be modified // via the call to cpu_execute exec.m_cycles_stolen = 0; m_executing_device = exec; exec.m_icountptr.i = exec.m_cycles_running; // *exec->m_icountptr = exec->m_cycles_running; if (!call_debugger) { exec.run(); } else { exec.debugger_start_cpu_hook(target); exec.run(); exec.debugger_stop_cpu_hook(); } // adjust for any cycles we took back //throw new emu_unimplemented(); #if false assert(ran >= *exec->m_icountptr); #endif ran -= exec.m_icountptr.i; //ran -= *exec->m_icountptr; //throw new emu_unimplemented(); #if false assert(ran >= exec->m_cycles_stolen); #endif ran -= exec.m_cycles_stolen; g_profiler.stop(); } // account for these cycles exec.m_totalcycles += (u64)ran; // update the local time for this CPU attotime deltatime; if (ran < exec.m_cycles_per_second) { deltatime = new attotime(0, exec.m_attoseconds_per_cycle * ran); } else { u32 remainder; s32 secs = (s32)divu_64x32_rem((u64)ran, exec.m_cycles_per_second, out remainder); deltatime = new attotime(secs, remainder * exec.m_attoseconds_per_cycle); } assert(deltatime >= attotime.zero); exec.m_localtime += deltatime; if (machine().video().frame_update_count() % 100 == 0) { LOG("device_scheduler.timeslice() - {0} ran, {1} total, time = {2}\n", ran, exec.m_totalcycles, exec.m_localtime.as_string()); } // if the new local CPU time is less than our target, move the target up, but not before the base if (exec.m_localtime < target) { target = std.max(exec.m_localtime, m_basetime); if (machine().video().frame_update_count() % 1000 == 0) { LOG("device_scheduler.timeslice() - (new target)\n"); } } } } } m_executing_device = null; // update the base time m_basetime = target; } // execute timers execute_timers(); }