forked from Minki/linux
7837699fa6
The patch moves the PIT model from userspace to kernel, and increases the timer accuracy greatly. [marcelo: make last_injected_time per-guest] Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Tested-and-Acked-by: Alex Davis <alex14641@yahoo.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
#ifndef __I8254_H
|
|
#define __I8254_H
|
|
|
|
#include "iodev.h"
|
|
|
|
struct kvm_kpit_timer {
|
|
struct hrtimer timer;
|
|
int irq;
|
|
s64 period; /* unit: ns */
|
|
s64 scheduled;
|
|
ktime_t last_update;
|
|
atomic_t pending;
|
|
};
|
|
|
|
struct kvm_kpit_channel_state {
|
|
u32 count; /* can be 65536 */
|
|
u16 latched_count;
|
|
u8 count_latched;
|
|
u8 status_latched;
|
|
u8 status;
|
|
u8 read_state;
|
|
u8 write_state;
|
|
u8 write_latch;
|
|
u8 rw_mode;
|
|
u8 mode;
|
|
u8 bcd; /* not supported */
|
|
u8 gate; /* timer start */
|
|
ktime_t count_load_time;
|
|
};
|
|
|
|
struct kvm_kpit_state {
|
|
struct kvm_kpit_channel_state channels[3];
|
|
struct kvm_kpit_timer pit_timer;
|
|
u32 speaker_data_on;
|
|
struct mutex lock;
|
|
struct kvm_pit *pit;
|
|
bool inject_pending; /* if inject pending interrupts */
|
|
unsigned long last_injected_time;
|
|
};
|
|
|
|
struct kvm_pit {
|
|
unsigned long base_addresss;
|
|
struct kvm_io_device dev;
|
|
struct kvm_io_device speaker_dev;
|
|
struct kvm *kvm;
|
|
struct kvm_kpit_state pit_state;
|
|
};
|
|
|
|
#define KVM_PIT_BASE_ADDRESS 0x40
|
|
#define KVM_SPEAKER_BASE_ADDRESS 0x61
|
|
#define KVM_PIT_MEM_LENGTH 4
|
|
#define KVM_PIT_FREQ 1193181
|
|
#define KVM_MAX_PIT_INTR_INTERVAL HZ / 100
|
|
#define KVM_PIT_CHANNEL_MASK 0x3
|
|
|
|
void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu);
|
|
void kvm_pit_timer_intr_post(struct kvm_vcpu *vcpu, int vec);
|
|
struct kvm_pit *kvm_create_pit(struct kvm *kvm);
|
|
void kvm_free_pit(struct kvm *kvm);
|
|
|
|
#endif
|