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-rw-r--r--src/emu/diexec.cpp903
1 files changed, 903 insertions, 0 deletions
diff --git a/src/emu/diexec.cpp b/src/emu/diexec.cpp
new file mode 100644
index 00000000000..f1f1528f826
--- /dev/null
+++ b/src/emu/diexec.cpp
@@ -0,0 +1,903 @@
+// license:BSD-3-Clause
+// copyright-holders:Aaron Giles
+/***************************************************************************
+
+ diexec.c
+
+ Device execution interfaces.
+
+***************************************************************************/
+
+#include "emu.h"
+#include "debugger.h"
+
+
+//**************************************************************************
+// DEBUGGING
+//**************************************************************************
+
+#define VERBOSE 0
+
+#define LOG(x) do { if (VERBOSE) m_execute->device().logerror x; } while (0)
+
+#define TEMPLOG 0
+
+
+
+//**************************************************************************
+// CONSTANTS
+//**************************************************************************
+
+const int TRIGGER_INT = -2000;
+const int TRIGGER_SUSPENDTIME = -4000;
+
+
+
+//**************************************************************************
+// EXECUTING DEVICE CONFIG
+//**************************************************************************
+
+//-------------------------------------------------
+// device_execute_interface - constructor
+//-------------------------------------------------
+
+device_execute_interface::device_execute_interface(const machine_config &mconfig, device_t &device)
+ : device_interface(device, "execute"),
+ m_disabled(false),
+ m_vblank_interrupt_screen(NULL),
+ m_timed_interrupt_period(attotime::zero),
+ m_is_octal(false),
+ m_nextexec(NULL),
+ m_timedint_timer(NULL),
+ m_profiler(PROFILER_IDLE),
+ m_icountptr(NULL),
+ m_cycles_running(0),
+ m_cycles_stolen(0),
+ m_suspend(0),
+ m_nextsuspend(0),
+ m_eatcycles(0),
+ m_nexteatcycles(0),
+ m_trigger(0),
+ m_inttrigger(0),
+ m_totalcycles(0),
+ m_divisor(0),
+ m_divshift(0),
+ m_cycles_per_second(0),
+ m_attoseconds_per_cycle(0)
+{
+ memset(&m_localtime, 0, sizeof(m_localtime));
+
+ // configure the fast accessor
+ device.m_execute = this;
+}
+
+
+//-------------------------------------------------
+// device_execute_interface - destructor
+//-------------------------------------------------
+
+device_execute_interface::~device_execute_interface()
+{
+}
+
+
+//-------------------------------------------------
+// static_set_disable - configuration helper to
+// set the disabled state of a device
+//-------------------------------------------------
+
+void device_execute_interface::static_set_disable(device_t &device)
+{
+ device_execute_interface *exec;
+ if (!device.interface(exec))
+ throw emu_fatalerror("MCFG_DEVICE_DISABLE called on device '%s' with no execute interface", device.tag());
+ exec->m_disabled = true;
+}
+
+
+//-------------------------------------------------
+// static_set_vblank_int - configuration helper
+// to set up VBLANK interrupts on the device
+//-------------------------------------------------
+
+void device_execute_interface::static_set_vblank_int(device_t &device, device_interrupt_delegate function, const char *tag, int rate)
+{
+ device_execute_interface *exec;
+ if (!device.interface(exec))
+ throw emu_fatalerror("MCFG_DEVICE_VBLANK_INT called on device '%s' with no execute interface", device.tag());
+ exec->m_vblank_interrupt = function;
+ exec->m_vblank_interrupt_screen = tag;
+}
+
+
+//-------------------------------------------------
+// static_set_periodic_int - configuration helper
+// to set up periodic interrupts on the device
+//-------------------------------------------------
+
+void device_execute_interface::static_set_periodic_int(device_t &device, device_interrupt_delegate function, const attotime &rate)
+{
+ device_execute_interface *exec;
+ if (!device.interface(exec))
+ throw emu_fatalerror("MCFG_DEVICE_PERIODIC_INT called on device '%s' with no execute interface", device.tag());
+ exec->m_timed_interrupt = function;
+ exec->m_timed_interrupt_period = rate;
+}
+
+
+//-------------------------------------------------
+// set_irq_acknowledge_callback - configuration helper
+// to setup callback for IRQ acknowledge
+//-------------------------------------------------
+
+void device_execute_interface::static_set_irq_acknowledge_callback(device_t &device, device_irq_acknowledge_delegate callback)
+{
+ device_execute_interface *exec;
+ if (!device.interface(exec))
+ throw emu_fatalerror("MCFG_DEVICE_IRQ_ACKNOWLEDGE called on device '%s' with no execute interface", device.tag());
+ exec->m_driver_irq = callback;
+}
+
+
+//-------------------------------------------------
+// executing - return true if this device is
+// within its execute function
+//-------------------------------------------------
+
+bool device_execute_interface::executing() const
+{
+ return (this == m_scheduler->currently_executing());
+}
+
+
+//-------------------------------------------------
+// cycles_remaining - return the number of cycles
+// remaining in this timeslice
+//-------------------------------------------------
+
+INT32 device_execute_interface::cycles_remaining() const
+{
+ return executing() ? *m_icountptr : 0;
+}
+
+
+//-------------------------------------------------
+// eat_cycles - safely eats cycles so we don't
+// cross a timeslice boundary
+//-------------------------------------------------
+
+void device_execute_interface::eat_cycles(int cycles)
+{
+ // ignore if not the executing device
+ if (!executing())
+ return;
+
+ // clamp cycles to the icount and update
+ if (cycles > *m_icountptr)
+ cycles = *m_icountptr;
+ *m_icountptr -= cycles;
+}
+
+
+//-------------------------------------------------
+// adjust_icount - apply a +/- to the current
+// icount
+//-------------------------------------------------
+
+void device_execute_interface::adjust_icount(int delta)
+{
+ // ignore if not the executing device
+ if (!executing())
+ return;
+
+ // apply the delta directly
+ *m_icountptr += delta;
+}
+
+
+//-------------------------------------------------
+// abort_timeslice - abort execution for the
+// current timeslice, allowing other devices to
+// run before we run again
+//-------------------------------------------------
+
+void device_execute_interface::abort_timeslice()
+{
+ // ignore if not the executing device
+ if (!executing())
+ return;
+
+ // swallow the remaining cycles
+ if (m_icountptr != NULL)
+ {
+ int delta = *m_icountptr;
+ m_cycles_stolen += delta;
+ m_cycles_running -= delta;
+ *m_icountptr -= delta;
+ }
+}
+
+
+//-------------------------------------------------
+// suspend_resume_changed
+//-------------------------------------------------
+
+void device_execute_interface::suspend_resume_changed()
+{
+ // inform the scheduler
+ m_scheduler->suspend_resume_changed();
+
+ // if we're active, synchronize
+ abort_timeslice();
+}
+
+
+//-------------------------------------------------
+// suspend - set a suspend reason for this device
+//-------------------------------------------------
+
+void device_execute_interface::suspend(UINT32 reason, bool eatcycles)
+{
+if (TEMPLOG) printf("suspend %s (%X)\n", device().tag(), reason);
+ // set the suspend reason and eat cycles flag
+ m_nextsuspend |= reason;
+ m_nexteatcycles = eatcycles;
+ suspend_resume_changed();
+}
+
+
+//-------------------------------------------------
+// resume - clear a suspend reason for this
+// device
+//-------------------------------------------------
+
+void device_execute_interface::resume(UINT32 reason)
+{
+if (TEMPLOG) printf("resume %s (%X)\n", device().tag(), reason);
+ // clear the suspend reason and eat cycles flag
+ m_nextsuspend &= ~reason;
+ suspend_resume_changed();
+}
+
+
+//-------------------------------------------------
+// spin_until_time - burn cycles for a specific
+// period of time
+//-------------------------------------------------
+
+void device_execute_interface::spin_until_time(const attotime &duration)
+{
+ static int timetrig = 0;
+
+ // suspend until the given trigger fires
+ suspend_until_trigger(TRIGGER_SUSPENDTIME + timetrig, true);
+
+ // then set a timer for it
+ m_scheduler->timer_set(duration, FUNC(static_timed_trigger_callback), TRIGGER_SUSPENDTIME + timetrig, this);
+ timetrig = (timetrig + 1) % 256;
+}
+
+
+//-------------------------------------------------
+// suspend_until_trigger - suspend execution
+// until the given trigger fires
+//-------------------------------------------------
+
+void device_execute_interface::suspend_until_trigger(int trigid, bool eatcycles)
+{
+ // suspend the device immediately if it's not already
+ suspend(SUSPEND_REASON_TRIGGER, eatcycles);
+
+ // set the trigger
+ m_trigger = trigid;
+}
+
+
+//-------------------------------------------------
+// trigger - respond to a trigger event
+//-------------------------------------------------
+
+void device_execute_interface::trigger(int trigid)
+{
+ // if we're executing, for an immediate abort
+ abort_timeslice();
+
+ // see if this is a matching trigger
+ if ((m_nextsuspend & SUSPEND_REASON_TRIGGER) != 0 && m_trigger == trigid)
+ {
+ resume(SUSPEND_REASON_TRIGGER);
+ m_trigger = 0;
+ }
+}
+
+
+//-------------------------------------------------
+// local_time - returns the current local time
+// for a device
+//-------------------------------------------------
+
+attotime device_execute_interface::local_time() const
+{
+ // if we're active, add in the time from the current slice
+ if (executing())
+ {
+ assert(m_cycles_running >= *m_icountptr);
+ int cycles = m_cycles_running - *m_icountptr;
+ return m_localtime + cycles_to_attotime(cycles);
+ }
+ return m_localtime;
+}
+
+
+//-------------------------------------------------
+// total_cycles - return the total number of
+// cycles executed on this device
+//-------------------------------------------------
+
+UINT64 device_execute_interface::total_cycles() const
+{
+ if (executing())
+ {
+ assert(m_cycles_running >= *m_icountptr);
+ return m_totalcycles + m_cycles_running - *m_icountptr;
+ }
+ else
+ return m_totalcycles;
+}
+
+
+//-------------------------------------------------
+// execute_clocks_to_cycles - convert the number
+// of clocks to cycles, rounding down if necessary
+//-------------------------------------------------
+
+UINT64 device_execute_interface::execute_clocks_to_cycles(UINT64 clocks) const
+{
+ return clocks;
+}
+
+
+//-------------------------------------------------
+// execute_cycles_to_clocks - convert the number
+// of cycles to clocks, rounding down if necessary
+//-------------------------------------------------
+
+UINT64 device_execute_interface::execute_cycles_to_clocks(UINT64 cycles) const
+{
+ return cycles;
+}
+
+
+//-------------------------------------------------
+// execute_min_cycles - return the smallest number
+// of cycles that a single instruction or
+// operation can take
+//-------------------------------------------------
+
+UINT32 device_execute_interface::execute_min_cycles() const
+{
+ return 1;
+}
+
+
+//-------------------------------------------------
+// execute_max_cycles - return the maximum number
+// of cycles that a single instruction or
+// operation can take
+//-------------------------------------------------
+
+UINT32 device_execute_interface::execute_max_cycles() const
+{
+ return 1;
+}
+
+
+//-------------------------------------------------
+// execute_input_lines - return the total number
+// of input lines for the device
+//-------------------------------------------------
+
+UINT32 device_execute_interface::execute_input_lines() const
+{
+ return 0;
+}
+
+
+//-------------------------------------------------
+// execute_default_irq_vector - return the default
+// IRQ vector when an acknowledge is processed
+//-------------------------------------------------
+
+UINT32 device_execute_interface::execute_default_irq_vector() const
+{
+ return 0;
+}
+
+
+//-------------------------------------------------
+// execute_burn - called after we consume a bunch
+// of cycles for artifical reasons (such as
+// spinning devices for performance optimization)
+//-------------------------------------------------
+
+void device_execute_interface::execute_burn(INT32 cycles)
+{
+ // by default, do nothing
+}
+
+
+//-------------------------------------------------
+// execute_set_input - called when a synchronized
+// input is changed
+//-------------------------------------------------
+
+void device_execute_interface::execute_set_input(int linenum, int state)
+{
+ // by default, do nothing
+}
+
+
+//-------------------------------------------------
+// interface_validity_check - validation for a
+// device after the configuration has been
+// constructed
+//-------------------------------------------------
+
+void device_execute_interface::interface_validity_check(validity_checker &valid) const
+{
+ // validate the interrupts
+ if (!m_vblank_interrupt.isnull())
+ {
+ screen_device_iterator iter(device().mconfig().root_device());
+ if (iter.first() == NULL)
+ osd_printf_error("VBLANK interrupt specified, but the driver is screenless\n");
+ else if (m_vblank_interrupt_screen != NULL && device().siblingdevice(m_vblank_interrupt_screen) == NULL)
+ osd_printf_error("VBLANK interrupt references a non-existant screen tag '%s'\n", m_vblank_interrupt_screen);
+ }
+
+ if (!m_timed_interrupt.isnull() && m_timed_interrupt_period == attotime::zero)
+ osd_printf_error("Timed interrupt handler specified with 0 period\n");
+ else if (m_timed_interrupt.isnull() && m_timed_interrupt_period != attotime::zero)
+ osd_printf_error("No timer interrupt handler specified, but has a non-0 period given\n");
+}
+
+
+//-------------------------------------------------
+// interface_pre_start - work to be done prior to
+// actually starting a device
+//-------------------------------------------------
+
+void device_execute_interface::interface_pre_start()
+{
+ m_scheduler = &device().machine().scheduler();
+
+ // bind delegates
+ m_vblank_interrupt.bind_relative_to(*device().owner());
+ m_timed_interrupt.bind_relative_to(*device().owner());
+ m_driver_irq.bind_relative_to(*device().owner());
+
+ // fill in the initial states
+ device_iterator iter(device().machine().root_device());
+ int index = iter.indexof(*this);
+ m_suspend = SUSPEND_REASON_RESET;
+ m_profiler = profile_type(index + PROFILER_DEVICE_FIRST);
+ m_inttrigger = index + TRIGGER_INT;
+
+ // allocate timers if we need them
+ if (m_timed_interrupt_period != attotime::zero)
+ m_timedint_timer = m_scheduler->timer_alloc(FUNC(static_trigger_periodic_interrupt), (void *)this);
+}
+
+
+//-------------------------------------------------
+// interface_post_start - work to be done after
+// actually starting a device
+//-------------------------------------------------
+
+void device_execute_interface::interface_post_start()
+{
+ // make sure somebody set us up the icount
+ assert_always(m_icountptr != NULL, "m_icountptr never initialized!");
+
+ // register for save states
+ device().save_item(NAME(m_suspend));
+ device().save_item(NAME(m_nextsuspend));
+ device().save_item(NAME(m_eatcycles));
+ device().save_item(NAME(m_nexteatcycles));
+ device().save_item(NAME(m_trigger));
+ device().save_item(NAME(m_totalcycles));
+ device().save_item(NAME(m_localtime));
+
+ // fill in the input states and IRQ callback information
+ for (int line = 0; line < ARRAY_LENGTH(m_input); line++)
+ m_input[line].start(this, line);
+}
+
+
+//-------------------------------------------------
+// interface_pre_reset - work to be done prior to
+// actually resetting a device
+//-------------------------------------------------
+
+void device_execute_interface::interface_pre_reset()
+{
+ // reset the total number of cycles
+ m_totalcycles = 0;
+
+ // enable all devices (except for disabled devices)
+ if (!disabled())
+ resume(SUSPEND_ANY_REASON);
+ else
+ suspend(SUSPEND_REASON_DISABLE, true);
+}
+
+
+//-------------------------------------------------
+// interface_post_reset - work to be done after a
+// device is reset
+//-------------------------------------------------
+
+void device_execute_interface::interface_post_reset()
+{
+ // reset the interrupt vectors and queues
+ for (int line = 0; line < ARRAY_LENGTH(m_input); line++)
+ m_input[line].reset();
+
+ // reconfingure VBLANK interrupts
+ if (m_vblank_interrupt_screen != NULL)
+ {
+ // get the screen that will trigger the VBLANK
+ screen_device *screen = downcast<screen_device *>(device().machine().device(device().siblingtag(m_vblank_interrupt_screen).c_str()));
+
+ assert(screen != NULL);
+ screen->register_vblank_callback(vblank_state_delegate(FUNC(device_execute_interface::on_vblank), this));
+ }
+
+ // reconfigure periodic interrupts
+ if (m_timed_interrupt_period != attotime::zero)
+ {
+ attotime timedint_period = m_timed_interrupt_period;
+ assert(m_timedint_timer != NULL);
+ m_timedint_timer->adjust(timedint_period, 0, timedint_period);
+ }
+}
+
+
+//-------------------------------------------------
+// interface_clock_changed - recomputes clock
+// information for this device
+//-------------------------------------------------
+
+void device_execute_interface::interface_clock_changed()
+{
+ // a clock of zero disables the device
+ if (device().clock() == 0)
+ {
+ suspend(SUSPEND_REASON_CLOCK, true);
+ return;
+ }
+
+ // if we were suspended because we had no clock, enable us now
+ if (suspended(SUSPEND_REASON_CLOCK))
+ resume(SUSPEND_REASON_CLOCK);
+
+ // recompute cps and spc
+ m_cycles_per_second = clocks_to_cycles(device().clock());
+ m_attoseconds_per_cycle = HZ_TO_ATTOSECONDS(m_cycles_per_second);
+
+ // update the device's divisor
+ INT64 attos = m_attoseconds_per_cycle;
+ m_divshift = 0;
+ while (attos >= (1UL << 31))
+ {
+ m_divshift++;
+ attos >>= 1;
+ }
+ m_divisor = attos;
+
+ // re-compute the perfect interleave factor
+ m_scheduler->compute_perfect_interleave();
+}
+
+
+//-------------------------------------------------
+// standard_irq_callback_member - IRQ acknowledge
+// callback; handles HOLD_LINE case and signals
+// to the debugger
+//-------------------------------------------------
+
+IRQ_CALLBACK_MEMBER( device_execute_interface::standard_irq_callback_member )
+{
+ return device.execute().standard_irq_callback(irqline);
+}
+
+int device_execute_interface::standard_irq_callback(int irqline)
+{
+ // get the default vector and acknowledge the interrupt if needed
+ int vector = m_input[irqline].default_irq_callback();
+
+ if (VERBOSE) device().logerror("standard_irq_callback('%s', %d) $%04x\n", device().tag(), irqline, vector);
+
+ // if there's a driver callback, run it to get the vector
+ if (!m_driver_irq.isnull())
+ vector = m_driver_irq(device(),irqline);
+
+ // notify the debugger
+ debugger_interrupt_hook(&device(), irqline);
+ return vector;
+}
+
+
+//-------------------------------------------------
+// minimum_quantum - return the minimum quantum
+// required for this device
+//-------------------------------------------------
+
+attoseconds_t device_execute_interface::minimum_quantum() const
+{
+ // if we don't have a clock, return a huge factor
+ if (device().clock() == 0)
+ return ATTOSECONDS_PER_SECOND - 1;
+
+ // if we don't have the quantum time, compute it
+ attoseconds_t basetick = m_attoseconds_per_cycle;
+ if (basetick == 0)
+ basetick = HZ_TO_ATTOSECONDS(clocks_to_cycles(device().clock()));
+
+ // apply the minimum cycle count
+ return basetick * min_cycles();
+}
+
+
+//-------------------------------------------------
+// static_timed_trigger_callback - signal a timed
+// trigger
+//-------------------------------------------------
+
+TIMER_CALLBACK( device_execute_interface::static_timed_trigger_callback )
+{
+ device_execute_interface *device = reinterpret_cast<device_execute_interface *>(ptr);
+ device->trigger(param);
+}
+
+
+//-------------------------------------------------
+// on_vblank - calls any external callbacks
+// for this screen
+//-------------------------------------------------
+
+void device_execute_interface::on_vblank(screen_device &screen, bool vblank_state)
+{
+ // ignore VBLANK end
+ if (!vblank_state)
+ return;
+
+ // generate the interrupt callback
+ if (!suspended(SUSPEND_REASON_HALT | SUSPEND_REASON_RESET | SUSPEND_REASON_DISABLE | SUSPEND_REASON_CLOCK))
+ {
+ if (!m_vblank_interrupt.isnull())
+ m_vblank_interrupt(device());
+ }
+}
+
+
+//-------------------------------------------------
+// static_trigger_periodic_interrupt - timer
+// callback for timed interrupts
+//-------------------------------------------------
+
+TIMER_CALLBACK( device_execute_interface::static_trigger_periodic_interrupt )
+{
+ reinterpret_cast<device_execute_interface *>(ptr)->trigger_periodic_interrupt();
+}
+
+void device_execute_interface::trigger_periodic_interrupt()
+{
+ // bail if there is no routine
+ if (!suspended(SUSPEND_REASON_HALT | SUSPEND_REASON_RESET | SUSPEND_REASON_DISABLE | SUSPEND_REASON_CLOCK))
+ {
+ if (!m_timed_interrupt.isnull())
+ m_timed_interrupt(device());
+ }
+}
+
+
+
+//**************************************************************************
+// DEVICE INPUT
+//**************************************************************************
+
+//-------------------------------------------------
+// device_input - constructor
+//-------------------------------------------------
+
+device_execute_interface::device_input::device_input()
+ : m_execute(NULL),
+ m_linenum(0),
+ m_stored_vector(0),
+ m_curvector(0),
+ m_curstate(CLEAR_LINE),
+ m_qindex(0)
+{
+ memset(m_queue, 0, sizeof(m_queue));
+}
+
+
+//-------------------------------------------------
+// start - called by interface_pre_start so we
+// can set ourselves up
+//-------------------------------------------------
+
+void device_execute_interface::device_input::start(device_execute_interface *execute, int linenum)
+{
+ m_execute = execute;
+ m_linenum = linenum;
+
+ reset();
+
+ device_t &device = m_execute->device();
+ device.save_item(NAME(m_stored_vector), m_linenum);
+ device.save_item(NAME(m_curvector), m_linenum);
+ device.save_item(NAME(m_curstate), m_linenum);
+}
+
+
+//-------------------------------------------------
+// reset - reset our input states
+//-------------------------------------------------
+
+void device_execute_interface::device_input::reset()
+{
+ m_curvector = m_stored_vector = m_execute->default_irq_vector();
+ m_qindex = 0;
+}
+
+
+//-------------------------------------------------
+// set_state_synced - enqueue an event for later
+// execution via timer
+//-------------------------------------------------
+
+void device_execute_interface::device_input::set_state_synced(int state, int vector)
+{
+ LOG(("set_state_synced('%s',%d,%d,%02x)\n", m_execute->device().tag(), m_linenum, state, vector));
+
+if (TEMPLOG) printf("setline(%s,%d,%d,%d)\n", m_execute->device().tag(), m_linenum, state, (vector == USE_STORED_VECTOR) ? 0 : vector);
+ assert(state == ASSERT_LINE || state == HOLD_LINE || state == CLEAR_LINE || state == PULSE_LINE);
+
+ // treat PULSE_LINE as ASSERT+CLEAR
+ if (state == PULSE_LINE)
+ {
+ // catch errors where people use PULSE_LINE for devices that don't support it
+ if (m_linenum != INPUT_LINE_NMI && m_linenum != INPUT_LINE_RESET)
+ throw emu_fatalerror("device '%s': PULSE_LINE can only be used for NMI and RESET lines\n", m_execute->device().tag());
+
+ set_state_synced(ASSERT_LINE, vector);
+ set_state_synced(CLEAR_LINE, vector);
+ return;
+ }
+
+ // if we're full of events, flush the queue and log a message
+ int event_index = m_qindex++;
+ if (event_index >= ARRAY_LENGTH(m_queue))
+ {
+ m_qindex--;
+ empty_event_queue();
+ event_index = m_qindex++;
+ m_execute->device().logerror("Exceeded pending input line event queue on device '%s'!\n", m_execute->device().tag());
+ }
+
+ // enqueue the event
+ if (event_index < ARRAY_LENGTH(m_queue))
+ {
+ if (vector == USE_STORED_VECTOR)
+ vector = m_stored_vector;
+ m_queue[event_index] = (state & 0xff) | (vector << 8);
+
+ // if this is the first one, set the timer
+ if (event_index == 0)
+ m_execute->scheduler().synchronize(FUNC(static_empty_event_queue), 0, (void *)this);
+ }
+}
+
+
+//-------------------------------------------------
+// empty_event_queue - empty our event queue
+//-------------------------------------------------
+
+TIMER_CALLBACK( device_execute_interface::device_input::static_empty_event_queue )
+{
+ reinterpret_cast<device_input *>(ptr)->empty_event_queue();
+}
+
+void device_execute_interface::device_input::empty_event_queue()
+{
+if (TEMPLOG) printf("empty_queue(%s,%d,%d)\n", m_execute->device().tag(), m_linenum, m_qindex);
+ // loop over all events
+ for (int curevent = 0; curevent < m_qindex; curevent++)
+ {
+ INT32 input_event = m_queue[curevent];
+
+ // set the input line state and vector
+ m_curstate = input_event & 0xff;
+ m_curvector = input_event >> 8;
+if (TEMPLOG) printf(" (%d,%d)\n", m_curstate, m_curvector);
+
+ assert(m_curstate == ASSERT_LINE || m_curstate == HOLD_LINE || m_curstate == CLEAR_LINE);
+
+ // special case: RESET
+ if (m_linenum == INPUT_LINE_RESET)
+ {
+ // if we're asserting the line, just halt the device
+ if (m_curstate == ASSERT_LINE)
+ m_execute->suspend(SUSPEND_REASON_RESET, true);
+
+ // if we're clearing the line that was previously asserted, reset the device
+ else if (m_execute->suspended(SUSPEND_REASON_RESET))
+ {
+ m_execute->device().reset();
+ m_execute->resume(SUSPEND_REASON_RESET);
+ }
+ }
+
+ // special case: HALT
+ else if (m_linenum == INPUT_LINE_HALT)
+ {
+ // if asserting, halt the device
+ if (m_curstate == ASSERT_LINE)
+ m_execute->suspend(SUSPEND_REASON_HALT, true);
+
+ // if clearing, unhalt the device
+ else if (m_curstate == CLEAR_LINE)
+ m_execute->resume(SUSPEND_REASON_HALT);
+ }
+
+ // all other cases
+ else
+ {
+ // switch off the requested state
+ switch (m_curstate)
+ {
+ case HOLD_LINE:
+ case ASSERT_LINE:
+ m_execute->execute_set_input(m_linenum, ASSERT_LINE);
+ break;
+
+ case CLEAR_LINE:
+ m_execute->execute_set_input(m_linenum, CLEAR_LINE);
+ break;
+
+ default:
+ m_execute->device().logerror("empty_event_queue device '%s', line %d, unknown state %d\n", m_execute->device().tag(), m_linenum, m_curstate);
+ break;
+ }
+
+ // generate a trigger to unsuspend any devices waiting on the interrupt
+ if (m_curstate != CLEAR_LINE)
+ m_execute->signal_interrupt_trigger();
+ }
+ }
+
+ // reset counter
+ m_qindex = 0;
+}
+
+
+//-------------------------------------------------
+// default_irq_callback - the default IRQ
+// callback for this input line
+//-------------------------------------------------
+
+int device_execute_interface::device_input::default_irq_callback()
+{
+ int vector = m_curvector;
+
+ // if the IRQ state is HOLD_LINE, clear it
+ if (m_curstate == HOLD_LINE)
+ {
+ LOG(("->set_irq_line('%s',%d,%d)\n", m_execute->device().tag(), m_linenum, CLEAR_LINE));
+ m_execute->execute_set_input(m_linenum, CLEAR_LINE);
+ m_curstate = CLEAR_LINE;
+ }
+ return vector;
+}