1 files changed, 65 insertions, 0 deletions
diff --git a/kernel/arch/x86/kvm/i8254.h b/kernel/arch/x86/kvm/i8254.h
new file mode 100644
index 000000000..c84990b42
--- /dev/null
+++ b/kernel/arch/x86/kvm/i8254.h
@@ -0,0 +1,65 @@
+#ifndef __I8254_H
+#define __I8254_H
+
+#include <linux/kthread.h>
+
+#include <kvm/iodev.h>
+
+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];
+	u32 flags;
+	bool is_periodic;
+	s64 period; 				/* unit: ns */
+	struct hrtimer timer;
+	atomic_t pending;			/* accumulated triggered timers */
+	bool reinject;
+	struct kvm *kvm;
+	u32    speaker_data_on;
+	struct mutex lock;
+	struct kvm_pit *pit;
+	spinlock_t inject_lock;
+	unsigned long irq_ack;
+	struct kvm_irq_ack_notifier irq_ack_notifier;
+};
+
+struct kvm_pit {
+	struct kvm_io_device dev;
+	struct kvm_io_device speaker_dev;
+	struct kvm *kvm;
+	struct kvm_kpit_state pit_state;
+	int irq_source_id;
+	struct kvm_irq_mask_notifier mask_notifier;
+	struct kthread_worker worker;
+	struct task_struct *worker_task;
+	struct kthread_work expired;
+};
+
+#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_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start);
+struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
+void kvm_free_pit(struct kvm *kvm);
+void kvm_pit_reset(struct kvm_pit *pit);
+
+#endif