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i8254: Factor out base class for KVM reuse

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Applying the concept used for the *PICs once again: establish a base
class for the i8254 that can be used both by the current user space
emulation and the upcoming KVM in-kernel version. We share most of the
public interface of the i8254, specifically to the pcspk, vmstate, reset
and certain init parts.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka 2012-03-02 20:28:46 +01:00 committed by Avi Kivity
parent e32605062c
commit d11e859e4a
4 changed files with 424 additions and 239 deletions

2
Makefile.objs

@ -210,7 +210,7 @@ hw-obj-$(CONFIG_EMPTY_SLOT) += empty_slot.o
hw-obj-$(CONFIG_SERIAL) += serial.o
hw-obj-$(CONFIG_PARALLEL) += parallel.o
hw-obj-$(CONFIG_I8254) += i8254.o
hw-obj-$(CONFIG_I8254) += i8254_common.o i8254.o
hw-obj-$(CONFIG_PCSPK) += pcspk.o
hw-obj-$(CONFIG_PCKBD) += pckbd.o
hw-obj-$(CONFIG_USB_UHCI) += usb-uhci.o

269
hw/i8254.c

@ -26,6 +26,7 @@
#include "isa.h"
#include "qemu-timer.h"
#include "i8254.h"
#include "i8254_internal.h"
//#define DEBUG_PIT
@ -34,34 +35,6 @@
#define RW_STATE_WORD0 3
#define RW_STATE_WORD1 4
typedef struct PITChannelState {
int count; /* can be 65536 */
uint16_t latched_count;
uint8_t count_latched;
uint8_t status_latched;
uint8_t status;
uint8_t read_state;
uint8_t write_state;
uint8_t write_latch;
uint8_t rw_mode;
uint8_t mode;
uint8_t bcd; /* not supported */
uint8_t gate; /* timer start */
int64_t count_load_time;
/* irq handling */
int64_t next_transition_time;
QEMUTimer *irq_timer;
qemu_irq irq;
uint32_t irq_disabled;
} PITChannelState;
typedef struct PITState {
ISADevice dev;
MemoryRegion ioports;
uint32_t iobase;
PITChannelState channels[3];
} PITState;
static void pit_irq_timer_update(PITChannelState *s, int64_t current_time);
static int pit_get_count(PITChannelState *s)
@ -89,99 +62,11 @@ static int pit_get_count(PITChannelState *s)
return counter;
}
/* get pit output bit */
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,
get_ticks_per_sec());
switch(s->mode) {
default:
case 0:
out = (d >= s->count);
break;
case 1:
out = (d < s->count);
break;
case 2:
if ((d % s->count) == 0 && d != 0)
out = 1;
else
out = 0;
break;
case 3:
out = (d % s->count) < ((s->count + 1) >> 1);
break;
case 4:
case 5:
out = (d == s->count);
break;
}
return out;
}
/* 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,
get_ticks_per_sec());
switch(s->mode) {
default:
case 0:
case 1:
if (d < s->count)
next_time = s->count;
else
return -1;
break;
case 2:
base = (d / s->count) * s->count;
if ((d - base) == 0 && d != 0)
next_time = base + s->count;
else
next_time = base + s->count + 1;
break;
case 3:
base = (d / s->count) * s->count;
period2 = ((s->count + 1) >> 1);
if ((d - base) < period2)
next_time = base + period2;
else
next_time = base + s->count;
break;
case 4:
case 5:
if (d < s->count)
next_time = s->count;
else if (d == s->count)
next_time = s->count + 1;
else
return -1;
break;
}
/* convert to timer units */
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)
next_time = current_time + 1;
return next_time;
}
/* val must be 0 or 1 */
void pit_set_gate(ISADevice *dev, int channel, int val)
static void pit_set_channel_gate(PITCommonState *s, PITChannelState *sc,
int val)
{
PITState *pit = DO_UPCAST(PITState, dev, dev);
PITChannelState *s = &pit->channels[channel];
switch(s->mode) {
switch (sc->mode) {
default:
case 0:
case 4:
@ -189,34 +74,23 @@ void pit_set_gate(ISADevice *dev, int channel, int val)
break;
case 1:
case 5:
if (s->gate < val) {
if (sc->gate < val) {
/* restart counting on rising edge */
s->count_load_time = qemu_get_clock_ns(vm_clock);
pit_irq_timer_update(s, s->count_load_time);
sc->count_load_time = qemu_get_clock_ns(vm_clock);
pit_irq_timer_update(sc, sc->count_load_time);
}
break;
case 2:
case 3:
if (s->gate < val) {
if (sc->gate < val) {
/* restart counting on rising edge */
s->count_load_time = qemu_get_clock_ns(vm_clock);
pit_irq_timer_update(s, s->count_load_time);
sc->count_load_time = qemu_get_clock_ns(vm_clock);
pit_irq_timer_update(sc, sc->count_load_time);
}
/* XXX: disable/enable counting */
break;
}
s->gate = val;
}
void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info)
{
PITState *pit = DO_UPCAST(PITState, dev, dev);
PITChannelState *s = &pit->channels[channel];
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));
sc->gate = val;
}
static inline void pit_load_count(PITChannelState *s, int val)
@ -239,7 +113,7 @@ static void pit_latch_count(PITChannelState *s)
static void pit_ioport_write(void *opaque, uint32_t addr, uint32_t val)
{
PITState *pit = opaque;
PITCommonState *pit = opaque;
int channel, access;
PITChannelState *s;
@ -306,7 +180,7 @@ static void pit_ioport_write(void *opaque, uint32_t addr, uint32_t val)
static uint32_t pit_ioport_read(void *opaque, uint32_t addr)
{
PITState *pit = opaque;
PITCommonState *pit = opaque;
int ret, count;
PITChannelState *s;
@ -387,94 +261,16 @@ static void pit_irq_timer(void *opaque)
pit_irq_timer_update(s, s->next_transition_time);
}
static const VMStateDescription vmstate_pit_channel = {
.name = "pit channel",
.version_id = 2,
.minimum_version_id = 2,
.minimum_version_id_old = 2,
.fields = (VMStateField []) {
VMSTATE_INT32(count, PITChannelState),
VMSTATE_UINT16(latched_count, PITChannelState),
VMSTATE_UINT8(count_latched, PITChannelState),
VMSTATE_UINT8(status_latched, PITChannelState),
VMSTATE_UINT8(status, PITChannelState),
VMSTATE_UINT8(read_state, PITChannelState),
VMSTATE_UINT8(write_state, PITChannelState),
VMSTATE_UINT8(write_latch, PITChannelState),
VMSTATE_UINT8(rw_mode, PITChannelState),
VMSTATE_UINT8(mode, PITChannelState),
VMSTATE_UINT8(bcd, PITChannelState),
VMSTATE_UINT8(gate, PITChannelState),
VMSTATE_INT64(count_load_time, PITChannelState),
VMSTATE_INT64(next_transition_time, PITChannelState),
VMSTATE_END_OF_LIST()
}
};
static int pit_load_old(QEMUFile *f, void *opaque, int version_id)
{
PITState *pit = opaque;
PITChannelState *s;
int i;
if (version_id != 1)
return -EINVAL;
for(i = 0; i < 3; i++) {
s = &pit->channels[i];
s->count=qemu_get_be32(f);
qemu_get_be16s(f, &s->latched_count);
qemu_get_8s(f, &s->count_latched);
qemu_get_8s(f, &s->status_latched);
qemu_get_8s(f, &s->status);
qemu_get_8s(f, &s->read_state);
qemu_get_8s(f, &s->write_state);
qemu_get_8s(f, &s->write_latch);
qemu_get_8s(f, &s->rw_mode);
qemu_get_8s(f, &s->mode);
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);
}
}
return 0;
}
static const VMStateDescription vmstate_pit = {
.name = "i8254",
.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(DeviceState *dev)
{
PITState *pit = container_of(dev, PITState, dev.qdev);
PITCommonState *pit = DO_UPCAST(PITCommonState, dev.qdev, dev);
PITChannelState *s;
int i;
for(i = 0;i < 3; i++) {
s = &pit->channels[i];
s->mode = 3;
s->gate = (i != 2);
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);
}
pit_reset_common(pit);
s = &pit->channels[0];
if (!s->irq_disabled) {
qemu_mod_timer(s->irq_timer, s->next_transition_time);
}
}
@ -482,7 +278,7 @@ static void pit_reset(DeviceState *dev)
* reenable it when legacy mode is left again. */
static void pit_irq_control(void *opaque, int n, int enable)
{
PITState *pit = opaque;
PITCommonState *pit = opaque;
PITChannelState *s = &pit->channels[0];
if (enable) {
@ -504,46 +300,43 @@ static const MemoryRegionOps pit_ioport_ops = {
.old_portio = pit_portio
};
static int pit_initfn(ISADevice *dev)
static int pit_initfn(PITCommonState *pit)
{
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_ns(vm_clock, pit_irq_timer, s);
qdev_init_gpio_out(&dev->qdev, &s->irq, 1);
qdev_init_gpio_out(&pit->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);
qdev_init_gpio_in(&dev->qdev, pit_irq_control, 1);
qdev_set_legacy_instance_id(&dev->qdev, pit->iobase, 2);
qdev_init_gpio_in(&pit->dev.qdev, pit_irq_control, 1);
return 0;
}
static Property pit_properties[] = {
DEFINE_PROP_HEX32("iobase", PITState, iobase, -1),
DEFINE_PROP_HEX32("iobase", PITCommonState, iobase, -1),
DEFINE_PROP_END_OF_LIST(),
};
static void pit_class_initfn(ObjectClass *klass, void *data)
{
PITCommonClass *k = PIT_COMMON_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
ic->init = pit_initfn;
dc->no_user = 1;
k->init = pit_initfn;
k->set_channel_gate = pit_set_channel_gate;
k->get_channel_info = pit_get_channel_info_common;
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),
.parent = TYPE_PIT_COMMON,
.instance_size = sizeof(PITCommonState),
.class_init = pit_class_initfn,
};

307
hw/i8254_common.c Normal file

@ -0,0 +1,307 @@
/*
* QEMU 8253/8254 - common bits of emulated and KVM kernel model
*
* Copyright (c) 2003-2004 Fabrice Bellard
* Copyright (c) 2012 Jan Kiszka, Siemens AG
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "hw.h"
#include "pc.h"
#include "isa.h"
#include "qemu-timer.h"
#include "i8254.h"
#include "i8254_internal.h"
/* val must be 0 or 1 */
void pit_set_gate(ISADevice *dev, int channel, int val)
{
PITCommonState *pit = PIT_COMMON(dev);
PITChannelState *s = &pit->channels[channel];
PITCommonClass *c = PIT_COMMON_GET_CLASS(pit);
c->set_channel_gate(pit, s, val);
}
/* get pit output bit */
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,
get_ticks_per_sec());
switch (s->mode) {
default:
case 0:
out = (d >= s->count);
break;
case 1:
out = (d < s->count);
break;
case 2:
if ((d % s->count) == 0 && d != 0) {
out = 1;
} else {
out = 0;
}
break;
case 3:
out = (d % s->count) < ((s->count + 1) >> 1);
break;
case 4:
case 5:
out = (d == s->count);
break;
}
return out;
}
/* return -1 if no transition will occur. */
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,
get_ticks_per_sec());
switch (s->mode) {
default:
case 0:
case 1:
if (d < s->count) {
next_time = s->count;
} else {
return -1;
}
break;
case 2:
base = (d / s->count) * s->count;
if ((d - base) == 0 && d != 0) {
next_time = base + s->count;
} else {
next_time = base + s->count + 1;
}
break;
case 3:
base = (d / s->count) * s->count;
period2 = ((s->count + 1) >> 1);
if ((d - base) < period2) {
next_time = base + period2;
} else {
next_time = base + s->count;
}
break;
case 4:
case 5:
if (d < s->count) {
next_time = s->count;
} else if (d == s->count) {
next_time = s->count + 1;
} else {
return -1;
}
break;
}
/* convert to timer units */
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) {
next_time = current_time + 1;
}
return next_time;
}
void pit_get_channel_info_common(PITCommonState *s, PITChannelState *sc,
PITChannelInfo *info)
{
info->gate = sc->gate;
info->mode = sc->mode;
info->initial_count = sc->count;
info->out = pit_get_out(sc, qemu_get_clock_ns(vm_clock));
}
void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info)
{
PITCommonState *pit = PIT_COMMON(dev);
PITChannelState *s = &pit->channels[channel];
PITCommonClass *c = PIT_COMMON_GET_CLASS(pit);
c->get_channel_info(pit, s, info);
}
void pit_reset_common(PITCommonState *pit)
{
PITChannelState *s;
int i;
for (i = 0; i < 3; i++) {
s = &pit->channels[i];
s->mode = 3;
s->gate = (i != 2);
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);
}
}
}
static int pit_init_common(ISADevice *dev)
{
PITCommonState *pit = PIT_COMMON(dev);
PITCommonClass *c = PIT_COMMON_GET_CLASS(pit);
int ret;
ret = c->init(pit);
if (ret < 0) {
return ret;
}
isa_register_ioport(dev, &pit->ioports, pit->iobase);
qdev_set_legacy_instance_id(&dev->qdev, pit->iobase, 2);
return 0;
}
static const VMStateDescription vmstate_pit_channel = {
.name = "pit channel",
.version_id = 2,
.minimum_version_id = 2,
.minimum_version_id_old = 2,
.fields = (VMStateField[]) {
VMSTATE_INT32(count, PITChannelState),
VMSTATE_UINT16(latched_count, PITChannelState),
VMSTATE_UINT8(count_latched, PITChannelState),
VMSTATE_UINT8(status_latched, PITChannelState),
VMSTATE_UINT8(status, PITChannelState),
VMSTATE_UINT8(read_state, PITChannelState),
VMSTATE_UINT8(write_state, PITChannelState),
VMSTATE_UINT8(write_latch, PITChannelState),
VMSTATE_UINT8(rw_mode, PITChannelState),
VMSTATE_UINT8(mode, PITChannelState),
VMSTATE_UINT8(bcd, PITChannelState),
VMSTATE_UINT8(gate, PITChannelState),
VMSTATE_INT64(count_load_time, PITChannelState),
VMSTATE_INT64(next_transition_time, PITChannelState),
VMSTATE_END_OF_LIST()
}
};
static int pit_load_old(QEMUFile *f, void *opaque, int version_id)
{
PITCommonState *pit = opaque;
PITChannelState *s;
int i;
if (version_id != 1) {
return -EINVAL;
}
for (i = 0; i < 3; i++) {
s = &pit->channels[i];
s->count = qemu_get_be32(f);
qemu_get_be16s(f, &s->latched_count);
qemu_get_8s(f, &s->count_latched);
qemu_get_8s(f, &s->status_latched);
qemu_get_8s(f, &s->status);
qemu_get_8s(f, &s->read_state);
qemu_get_8s(f, &s->write_state);
qemu_get_8s(f, &s->write_latch);
qemu_get_8s(f, &s->rw_mode);
qemu_get_8s(f, &s->mode);
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);
}
}
return 0;
}
static void pit_dispatch_pre_save(void *opaque)
{
PITCommonState *s = opaque;
PITCommonClass *c = PIT_COMMON_GET_CLASS(s);
if (c->pre_save) {
c->pre_save(s);
}
}
static int pit_dispatch_post_load(void *opaque, int version_id)
{
PITCommonState *s = opaque;
PITCommonClass *c = PIT_COMMON_GET_CLASS(s);
if (c->post_load) {
c->post_load(s);
}
return 0;
}
static const VMStateDescription vmstate_pit_common = {
.name = "i8254",
.version_id = 3,
.minimum_version_id = 2,
.minimum_version_id_old = 1,
.load_state_old = pit_load_old,
.pre_save = pit_dispatch_pre_save,
.post_load = pit_dispatch_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT32_V(channels[0].irq_disabled, PITCommonState, 3),
VMSTATE_STRUCT_ARRAY(channels, PITCommonState, 3, 2,
vmstate_pit_channel, PITChannelState),
VMSTATE_TIMER(channels[0].irq_timer, PITCommonState),
VMSTATE_END_OF_LIST()
}
};
static void pit_common_class_init(ObjectClass *klass, void *data)
{
ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
ic->init = pit_init_common;
dc->vmsd = &vmstate_pit_common;
dc->no_user = 1;
}
static TypeInfo pit_common_type = {
.name = TYPE_PIT_COMMON,
.parent = TYPE_ISA_DEVICE,
.instance_size = sizeof(PITCommonState),
.class_size = sizeof(PITCommonClass),
.class_init = pit_common_class_init,
.abstract = true,
};
static void register_devices(void)
{
type_register_static(&pit_common_type);
}
type_init(register_devices);

85
hw/i8254_internal.h Normal file

@ -0,0 +1,85 @@
/*
* QEMU 8253/8254 - internal interfaces
*
* Copyright (c) 2011 Jan Kiszka, Siemens AG
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef QEMU_I8254_INTERNAL_H
#define QEMU_I8254_INTERNAL_H
#include "hw.h"
#include "pc.h"
#include "isa.h"
typedef struct PITChannelState {
int count; /* can be 65536 */
uint16_t latched_count;
uint8_t count_latched;
uint8_t status_latched;
uint8_t status;
uint8_t read_state;
uint8_t write_state;
uint8_t write_latch;
uint8_t rw_mode;
uint8_t mode;
uint8_t bcd; /* not supported */
uint8_t gate; /* timer start */
int64_t count_load_time;
/* irq handling */
int64_t next_transition_time;
QEMUTimer *irq_timer;
qemu_irq irq;
uint32_t irq_disabled;
} PITChannelState;
typedef struct PITCommonState {
ISADevice dev;
MemoryRegion ioports;
uint32_t iobase;
PITChannelState channels[3];
} PITCommonState;
#define TYPE_PIT_COMMON "pit-common"
#define PIT_COMMON(obj) \
OBJECT_CHECK(PITCommonState, (obj), TYPE_PIT_COMMON)
#define PIT_COMMON_CLASS(klass) \
OBJECT_CLASS_CHECK(PITCommonClass, (klass), TYPE_PIT_COMMON)
#define PIT_COMMON_GET_CLASS(obj) \
OBJECT_GET_CLASS(PITCommonClass, (obj), TYPE_PIT_COMMON)
typedef struct PITCommonClass {
ISADeviceClass parent_class;
int (*init)(PITCommonState *s);
void (*set_channel_gate)(PITCommonState *s, PITChannelState *sc, int val);
void (*get_channel_info)(PITCommonState *s, PITChannelState *sc,
PITChannelInfo *info);
void (*pre_save)(PITCommonState *s);
void (*post_load)(PITCommonState *s);
} PITCommonClass;
int pit_get_out(PITChannelState *s, int64_t current_time);
int64_t pit_get_next_transition_time(PITChannelState *s, int64_t current_time);
void pit_get_channel_info_common(PITCommonState *s, PITChannelState *sc,
PITChannelInfo *info);
void pit_reset_common(PITCommonState *s);
#endif /* !QEMU_I8254_INTERNAL_H */