75 x86emu_i8254_counter(struct x86emu_i8254_timer *timer, uint64_t curtick)  in x86emu_i8254_counter()  argument
80 	if (timer->gate_high || timer->start_tick > curtick)  in x86emu_i8254_counter()
81 		return timer->active_counter;  in x86emu_i8254_counter()
84 	if (timer->active_is_bcd)  in x86emu_i8254_counter()
89 	curtick -= timer->start_tick;  in x86emu_i8254_counter()
92 	if (curtick <= timer->active_counter)  in x86emu_i8254_counter()
93 		return timer->active_counter - curtick;  in x86emu_i8254_counter()
97 	if (timer->active_counter == 0 && curtick - 1 <= maxtick)  in x86emu_i8254_counter()
101 	if (timer->active_mode & 2)  in x86emu_i8254_counter()
102 		return timer->active_counter - curtick % timer->active_counter;  in x86emu_i8254_counter()
110 x86emu_i8254_out(struct x86emu_i8254_timer *timer, uint64_t curtick)  in x86emu_i8254_out()  argument
123 	if (timer->gate_high || timer->start_tick > curtick)  in x86emu_i8254_out()
124 		return (timer->active_mode != 0);  in x86emu_i8254_out()
126 	curtick -= timer->start_tick;  in x86emu_i8254_out()
129 	if (timer->active_mode == 0 || timer->active_mode == 1)  in x86emu_i8254_out()
130 		return curtick >= timer->start_tick;  in x86emu_i8254_out()
133 	if (timer->active_mode == 5 || timer->active_mode == 7)  in x86emu_i8254_out()
134 		return curtick != timer->start_tick;  in x86emu_i8254_out()
140 	if (timer->active_mode == 2 || timer->active_mode == 3) {  in x86emu_i8254_out()
141 		curtick %= timer->active_counter;  in x86emu_i8254_out()
142 		return curtick + 1 != timer->active_counter;  in x86emu_i8254_out()
149 	curtick %= timer->active_counter;  in x86emu_i8254_out()
150 	return curtick < (timer->active_counter + 1) / 2;  in x86emu_i8254_out()
154 x86emu_i8254_latch_status(struct x86emu_i8254_timer *timer, uint64_t curtick)  in x86emu_i8254_latch_status()  argument
156 	if (timer->status_is_latched)  in x86emu_i8254_latch_status()
158 	timer->latched_status = timer->active_is_bcd ? 1 : 0;  in x86emu_i8254_latch_status()
159 	timer->latched_status |= timer->active_mode << 1;  in x86emu_i8254_latch_status()
160 	timer->latched_status |= timer->rw_status;  in x86emu_i8254_latch_status()
161 	timer->latched_status |= timer->null_count ? 0x40 : 0;  in x86emu_i8254_latch_status()
165 x86emu_i8254_latch_counter(struct x86emu_i8254_timer *timer, uint64_t curtick)  in x86emu_i8254_latch_counter()  argument
167 	if (!timer->counter_is_latched)  in x86emu_i8254_latch_counter()
169 	timer->latched_counter = x86emu_i8254_counter(timer, curtick);  in x86emu_i8254_latch_counter()
170 	timer->counter_is_latched = true;  in x86emu_i8254_latch_counter()
176 	struct x86emu_i8254_timer *timer;  in x86emu_i8254_write_command()  local
185 			timer = &sc->timer[i];  in x86emu_i8254_write_command()
190 				x86emu_i8254_latch_status(timer, curtick);  in x86emu_i8254_write_command()
192 				x86emu_i8254_latch_counter(timer, curtick);  in x86emu_i8254_write_command()
197 	timer = &sc->timer[val >> 6];  in x86emu_i8254_write_command()
201 		x86emu_i8254_latch_counter(timer, x86emu_i8254_gettick(sc));  in x86emu_i8254_write_command()
204 		timer->write_lsb = timer->read_lsb = true;  in x86emu_i8254_write_command()
205 		timer->write_msb = timer->read_msb = false;  in x86emu_i8254_write_command()
208 		timer->write_lsb = timer->read_lsb = false;  in x86emu_i8254_write_command()
209 		timer->write_msb = timer->read_msb = true;  in x86emu_i8254_write_command()
212 		timer->write_lsb = timer->read_lsb = true;  in x86emu_i8254_write_command()
213 		timer->write_msb = timer->read_msb = true;  in x86emu_i8254_write_command()
216 	timer->rw_status = val & 0x30;  in x86emu_i8254_write_command()
217 	timer->null_count = true;  in x86emu_i8254_write_command()
218 	timer->new_mode = (val >> 1) & 0x7;  in x86emu_i8254_write_command()
219 	timer->new_is_bcd = (val & 1) == 1;  in x86emu_i8254_write_command()
224     struct x86emu_i8254_timer *timer)  in x86emu_i8254_read_counter()  argument
230 	if (timer->status_is_latched) {  in x86emu_i8254_read_counter()
231 		timer->status_is_latched = false;  in x86emu_i8254_read_counter()
232 		return timer->latched_status;  in x86emu_i8254_read_counter()
239 	if (timer->counter_is_latched)  in x86emu_i8254_read_counter()
240 		val = timer->latched_counter;  in x86emu_i8254_read_counter()
242 		val = x86emu_i8254_counter(&sc->timer[2],  in x86emu_i8254_read_counter()
245 	if (timer->active_is_bcd)  in x86emu_i8254_read_counter()
249 	if (timer->read_lsb) {  in x86emu_i8254_read_counter()
251 		timer->read_lsb = false;  in x86emu_i8254_read_counter()
252 	} else if (timer->read_msb) {  in x86emu_i8254_read_counter()
254 		timer->read_msb = false;  in x86emu_i8254_read_counter()
259 	if (!timer->read_lsb && !timer->read_msb)  in x86emu_i8254_read_counter()
260 		timer->counter_is_latched = false;  in x86emu_i8254_read_counter()
267     struct x86emu_i8254_timer *timer, uint8_t val)  in x86emu_i8254_write_counter()  argument
270 	if (!timer->write_lsb && !timer->write_msb)  in x86emu_i8254_write_counter()
274 	if (timer->write_lsb) {  in x86emu_i8254_write_counter()
275 		timer->new_counter &= ~0xff;  in x86emu_i8254_write_counter()
276 		timer->new_counter |= val;  in x86emu_i8254_write_counter()
277 		timer->write_lsb = false;  in x86emu_i8254_write_counter()
279 		KASSERT(timer->write_msb);  in x86emu_i8254_write_counter()
280 		timer->new_counter &= ~0xff00;  in x86emu_i8254_write_counter()
281 		timer->new_counter |= val << 8;  in x86emu_i8254_write_counter()
282 		timer->write_msb = false;  in x86emu_i8254_write_counter()
286 	if (!timer->write_lsb && !timer->write_msb) {  in x86emu_i8254_write_counter()
287 		timer->null_count = false;  in x86emu_i8254_write_counter()
288 		timer->counter_is_latched = false;  in x86emu_i8254_write_counter()
289 		timer->status_is_latched = false;  in x86emu_i8254_write_counter()
290 		timer->active_is_bcd = timer->new_is_bcd;  in x86emu_i8254_write_counter()
291 		timer->active_mode = timer->new_mode;  in x86emu_i8254_write_counter()
292 		timer->start_tick = x86emu_i8254_gettick(sc) + 1;  in x86emu_i8254_write_counter()
293 		if (timer->new_is_bcd)  in x86emu_i8254_write_counter()
294 			timer->active_counter = bcd2bin(timer->new_counter);  in x86emu_i8254_write_counter()
303 	val = (sc->timer[2].gate_high) ? 1 : 0;  in x86emu_i8254_read_nmi()
304 	if (x86emu_i8254_out(&sc->timer[2], x86emu_i8254_gettick(sc)))  in x86emu_i8254_read_nmi()
315 	old_gate = sc->timer[2].gate_high;  in x86emu_i8254_write_nmi()
316 	sc->timer[2].gate_high = (val & 1) == 1;  in x86emu_i8254_write_nmi()
317 	if (!old_gate && sc->timer[2].gate_high)  in x86emu_i8254_write_nmi()
318 		sc->timer[2].start_tick = x86emu_i8254_gettick(sc) + 1;  in x86emu_i8254_write_nmi()
324 	struct x86emu_i8254_timer *timer;  in x86emu_i8254_init()  local
331 		timer = &sc->timer[i];  in x86emu_i8254_init()
332 		timer->gate_high = false;  in x86emu_i8254_init()
333 		timer->start_tick = 0;  in x86emu_i8254_init()
334 		timer->active_counter = 0;  in x86emu_i8254_init()
335 		timer->active_mode = 0;  in x86emu_i8254_init()
336 		timer->active_is_bcd = false;  in x86emu_i8254_init()
337 		timer->counter_is_latched = false;  in x86emu_i8254_init()
338 		timer->read_lsb = false;  in x86emu_i8254_init()
339 		timer->read_msb = false;  in x86emu_i8254_init()
340 		timer->status_is_latched = false;  in x86emu_i8254_init()
341 		timer->null_count = false;  in x86emu_i8254_init()
350 		return x86emu_i8254_read_counter(sc, &sc->timer[0]);  in x86emu_i8254_inb()
352 		return x86emu_i8254_read_counter(sc, &sc->timer[1]);  in x86emu_i8254_inb()
354 		return x86emu_i8254_read_counter(sc, &sc->timer[2]);  in x86emu_i8254_inb()
365 		x86emu_i8254_write_counter(sc, &sc->timer[0], val);  in x86emu_i8254_outb()
367 		x86emu_i8254_write_counter(sc, &sc->timer[1], val);  in x86emu_i8254_outb()
369 		x86emu_i8254_write_counter(sc, &sc->timer[2], val);  in x86emu_i8254_outb()