root/arch/x86/kvm/i8254.h

INCLUDED FROM

#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);
void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val);
struct kvm_pit *kvm_create_pit(struct kvm *kvm);
void kvm_free_pit(struct kvm *kvm);
void kvm_pit_reset(struct kvm_pit *pit);

#endif