#include "pc.h"
#include "isa.h"
#include "qemu-timer.h"
+#include "i8254.h"
//#define DEBUG_PIT
int64_t next_transition_time;
QEMUTimer *irq_timer;
qemu_irq irq;
+ uint32_t irq_disabled;
} PITChannelState;
-struct PITState {
+typedef struct PITState {
+ ISADevice dev;
+ MemoryRegion ioports;
+ uint32_t iobase;
PITChannelState channels[3];
-};
-
-static PITState pit_state;
+} PITState;
static void pit_irq_timer_update(PITChannelState *s, int64_t current_time);
uint64_t d;
int counter;
- d = muldiv64(qemu_get_clock(vm_clock) - s->count_load_time, PIT_FREQ, ticks_per_sec);
+ d = muldiv64(qemu_get_clock_ns(vm_clock) - s->count_load_time, PIT_FREQ,
+ get_ticks_per_sec());
switch(s->mode) {
case 0:
case 1:
}
/* get pit output bit */
-static int pit_get_out1(PITChannelState *s, int64_t current_time)
+static int pit_get_out(PITChannelState *s, int64_t current_time)
{
uint64_t d;
int out;
- d = muldiv64(current_time - s->count_load_time, PIT_FREQ, ticks_per_sec);
+ d = muldiv64(current_time - s->count_load_time, PIT_FREQ,
+ get_ticks_per_sec());
switch(s->mode) {
default:
case 0:
return out;
}
-int pit_get_out(PITState *pit, int channel, int64_t current_time)
-{
- PITChannelState *s = &pit->channels[channel];
- return pit_get_out1(s, current_time);
-}
-
/* return -1 if no transition will occur. */
static int64_t pit_get_next_transition_time(PITChannelState *s,
int64_t current_time)
uint64_t d, next_time, base;
int period2;
- d = muldiv64(current_time - s->count_load_time, PIT_FREQ, ticks_per_sec);
+ d = muldiv64(current_time - s->count_load_time, PIT_FREQ,
+ get_ticks_per_sec());
switch(s->mode) {
default:
case 0:
break;
}
/* convert to timer units */
- next_time = s->count_load_time + muldiv64(next_time, ticks_per_sec, PIT_FREQ);
+ next_time = s->count_load_time + muldiv64(next_time, get_ticks_per_sec(),
+ PIT_FREQ);
/* fix potential rounding problems */
/* XXX: better solution: use a clock at PIT_FREQ Hz */
if (next_time <= current_time)
}
/* val must be 0 or 1 */
-void pit_set_gate(PITState *pit, int channel, int val)
+void pit_set_gate(ISADevice *dev, int channel, int val)
{
+ PITState *pit = DO_UPCAST(PITState, dev, dev);
PITChannelState *s = &pit->channels[channel];
switch(s->mode) {
case 5:
if (s->gate < val) {
/* restart counting on rising edge */
- s->count_load_time = qemu_get_clock(vm_clock);
+ s->count_load_time = qemu_get_clock_ns(vm_clock);
pit_irq_timer_update(s, s->count_load_time);
}
break;
case 3:
if (s->gate < val) {
/* restart counting on rising edge */
- s->count_load_time = qemu_get_clock(vm_clock);
+ s->count_load_time = qemu_get_clock_ns(vm_clock);
pit_irq_timer_update(s, s->count_load_time);
}
/* XXX: disable/enable counting */
s->gate = val;
}
-int pit_get_gate(PITState *pit, int channel)
+void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info)
{
+ PITState *pit = DO_UPCAST(PITState, dev, dev);
PITChannelState *s = &pit->channels[channel];
- return s->gate;
-}
-
-int pit_get_initial_count(PITState *pit, int channel)
-{
- PITChannelState *s = &pit->channels[channel];
- return s->count;
-}
-int pit_get_mode(PITState *pit, int channel)
-{
- PITChannelState *s = &pit->channels[channel];
- return s->mode;
+ info->gate = s->gate;
+ info->mode = s->mode;
+ info->initial_count = s->count;
+ info->out = pit_get_out(s, qemu_get_clock_ns(vm_clock));
}
static inline void pit_load_count(PITChannelState *s, int val)
{
if (val == 0)
val = 0x10000;
- s->count_load_time = qemu_get_clock(vm_clock);
+ s->count_load_time = qemu_get_clock_ns(vm_clock);
s->count = val;
pit_irq_timer_update(s, s->count_load_time);
}
if (!(val & 0x10) && !s->status_latched) {
/* status latch */
/* XXX: add BCD and null count */
- s->status = (pit_get_out1(s, qemu_get_clock(vm_clock)) << 7) |
+ s->status =
+ (pit_get_out(s,
+ qemu_get_clock_ns(vm_clock)) << 7) |
(s->rw_mode << 4) |
(s->mode << 1) |
s->bcd;
int64_t expire_time;
int irq_level;
- if (!s->irq_timer)
+ if (!s->irq_timer || s->irq_disabled) {
return;
+ }
expire_time = pit_get_next_transition_time(s, current_time);
- irq_level = pit_get_out1(s, current_time);
+ irq_level = pit_get_out(s, current_time);
qemu_set_irq(s->irq, irq_level);
#ifdef DEBUG_PIT
printf("irq_level=%d next_delay=%f\n",
irq_level,
- (double)(expire_time - current_time) / ticks_per_sec);
+ (double)(expire_time - current_time) / get_ticks_per_sec());
#endif
s->next_transition_time = expire_time;
if (expire_time != -1)
qemu_get_8s(f, &s->bcd);
qemu_get_8s(f, &s->gate);
s->count_load_time=qemu_get_be64(f);
+ s->irq_disabled = 0;
if (s->irq_timer) {
s->next_transition_time=qemu_get_be64(f);
qemu_get_timer(f, s->irq_timer);
static const VMStateDescription vmstate_pit = {
.name = "i8254",
- .version_id = 2,
+ .version_id = 3,
.minimum_version_id = 2,
.minimum_version_id_old = 1,
.load_state_old = pit_load_old,
.fields = (VMStateField []) {
+ VMSTATE_UINT32_V(channels[0].irq_disabled, PITState, 3),
VMSTATE_STRUCT_ARRAY(channels, PITState, 3, 2, vmstate_pit_channel, PITChannelState),
VMSTATE_TIMER(channels[0].irq_timer, PITState),
VMSTATE_END_OF_LIST()
}
};
-static void pit_reset(void *opaque)
+static void pit_reset(DeviceState *dev)
{
- PITState *pit = opaque;
+ PITState *pit = container_of(dev, PITState, dev.qdev);
PITChannelState *s;
int i;
s = &pit->channels[i];
s->mode = 3;
s->gate = (i != 2);
- pit_load_count(s, 0);
+ s->count_load_time = qemu_get_clock_ns(vm_clock);
+ s->count = 0x10000;
+ if (i == 0 && !s->irq_disabled) {
+ s->next_transition_time =
+ pit_get_next_transition_time(s, s->count_load_time);
+ qemu_mod_timer(s->irq_timer, s->next_transition_time);
+ }
}
}
-/* When HPET is operating in legacy mode, i8254 timer0 is disabled */
-void hpet_pit_disable(void) {
- PITChannelState *s;
- s = &pit_state.channels[0];
- if (s->irq_timer)
+/* When HPET is operating in legacy mode, suppress the ignored timer IRQ,
+ * reenable it when legacy mode is left again. */
+static void pit_irq_control(void *opaque, int n, int enable)
+{
+ PITState *pit = opaque;
+ PITChannelState *s = &pit->channels[0];
+
+ if (enable) {
+ s->irq_disabled = 0;
+ pit_irq_timer_update(s, qemu_get_clock_ns(vm_clock));
+ } else {
+ s->irq_disabled = 1;
qemu_del_timer(s->irq_timer);
+ }
}
-/* When HPET is reset or leaving legacy mode, it must reenable i8254
- * timer 0
- */
+static const MemoryRegionPortio pit_portio[] = {
+ { 0, 4, 1, .write = pit_ioport_write },
+ { 0, 3, 1, .read = pit_ioport_read },
+ PORTIO_END_OF_LIST()
+};
-void hpet_pit_enable(void)
-{
- PITState *pit = &pit_state;
- PITChannelState *s;
- s = &pit->channels[0];
- s->mode = 3;
- s->gate = 1;
- pit_load_count(s, 0);
-}
+static const MemoryRegionOps pit_ioport_ops = {
+ .old_portio = pit_portio
+};
-PITState *pit_init(int base, qemu_irq irq)
+static int pit_initfn(ISADevice *dev)
{
- PITState *pit = &pit_state;
+ PITState *pit = DO_UPCAST(PITState, dev, dev);
PITChannelState *s;
s = &pit->channels[0];
/* the timer 0 is connected to an IRQ */
- s->irq_timer = qemu_new_timer(vm_clock, pit_irq_timer, s);
- s->irq = irq;
+ s->irq_timer = qemu_new_timer_ns(vm_clock, pit_irq_timer, s);
+ qdev_init_gpio_out(&dev->qdev, &s->irq, 1);
+
+ memory_region_init_io(&pit->ioports, &pit_ioport_ops, pit, "pit", 4);
+ isa_register_ioport(dev, &pit->ioports, pit->iobase);
- vmstate_register(base, &vmstate_pit, pit);
- qemu_register_reset(pit_reset, pit);
- register_ioport_write(base, 4, 1, pit_ioport_write, pit);
- register_ioport_read(base, 3, 1, pit_ioport_read, pit);
+ qdev_init_gpio_in(&dev->qdev, pit_irq_control, 1);
- pit_reset(pit);
+ qdev_set_legacy_instance_id(&dev->qdev, pit->iobase, 2);
- return pit;
+ return 0;
}
+
+static Property pit_properties[] = {
+ DEFINE_PROP_HEX32("iobase", PITState, iobase, -1),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void pit_class_initfn(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
+ ic->init = pit_initfn;
+ dc->no_user = 1;
+ dc->reset = pit_reset;
+ dc->vmsd = &vmstate_pit;
+ dc->props = pit_properties;
+}
+
+static TypeInfo pit_info = {
+ .name = "isa-pit",
+ .parent = TYPE_ISA_DEVICE,
+ .instance_size = sizeof(PITState),
+ .class_init = pit_class_initfn,
+};
+
+static void pit_register_types(void)
+{
+ type_register_static(&pit_info);
+}
+
+type_init(pit_register_types)
projects / qemu.git / blobdiff