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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
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85
hw/i8254_internal.h Normal file
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/*
* 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 */