1 #ifndef __I8254_H
2 #define __I8254_H
3 
4 #include "iodev.h"
5 
6 struct kvm_kpit_channel_state {
7 	u32 count; /* can be 65536 */
8 	u16 latched_count;
9 	u8 count_latched;
10 	u8 status_latched;
11 	u8 status;
12 	u8 read_state;
13 	u8 write_state;
14 	u8 write_latch;
15 	u8 rw_mode;
16 	u8 mode;
17 	u8 bcd; /* not supported */
18 	u8 gate; /* timer start */
19 	ktime_t count_load_time;
20 };
21 
22 struct kvm_kpit_state {
23 	struct kvm_kpit_channel_state channels[3];
24 	u32 flags;
25 	struct kvm_timer pit_timer;
26 	bool is_periodic;
27 	u32    speaker_data_on;
28 	struct mutex lock;
29 	struct kvm_pit *pit;
30 	spinlock_t inject_lock;
31 	unsigned long irq_ack;
32 	struct kvm_irq_ack_notifier irq_ack_notifier;
33 };
34 
35 struct kvm_pit {
36 	struct kvm_io_device dev;
37 	struct kvm_io_device speaker_dev;
38 	struct kvm *kvm;
39 	struct kvm_kpit_state pit_state;
40 	int irq_source_id;
41 	struct kvm_irq_mask_notifier mask_notifier;
42 	struct workqueue_struct *wq;
43 	struct work_struct expired;
44 };
45 
46 #define KVM_PIT_BASE_ADDRESS	    0x40
47 #define KVM_SPEAKER_BASE_ADDRESS    0x61
48 #define KVM_PIT_MEM_LENGTH	    4
49 #define KVM_PIT_FREQ		    1193181
50 #define KVM_MAX_PIT_INTR_INTERVAL   HZ / 100
51 #define KVM_PIT_CHANNEL_MASK	    0x3
52 
53 void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start);
54 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
55 void kvm_free_pit(struct kvm *kvm);
56 void kvm_pit_reset(struct kvm_pit *pit);
57 
58 #endif
59