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i8254.h
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1 #ifndef __I8254_H
2 #define __I8254_H
3 
4 #include <linux/kthread.h>
5 
6 #include "iodev.h"
7 
8 struct kvm_kpit_channel_state {
9  u32 count; /* can be 65536 */
10  u16 latched_count;
11  u8 count_latched;
12  u8 status_latched;
13  u8 status;
14  u8 read_state;
15  u8 write_state;
16  u8 write_latch;
17  u8 rw_mode;
18  u8 mode;
19  u8 bcd; /* not supported */
20  u8 gate; /* timer start */
21  ktime_t count_load_time;
22 };
23 
24 struct kvm_kpit_state {
25  struct kvm_kpit_channel_state channels[3];
26  u32 flags;
27  bool is_periodic;
28  s64 period; /* unit: ns */
29  struct hrtimer timer;
30  atomic_t pending; /* accumulated triggered timers */
31  bool reinject;
32  struct kvm *kvm;
33  u32 speaker_data_on;
34  struct mutex lock;
35  struct kvm_pit *pit;
36  spinlock_t inject_lock;
37  unsigned long irq_ack;
38  struct kvm_irq_ack_notifier irq_ack_notifier;
39 };
40 
41 struct kvm_pit {
42  struct kvm_io_device dev;
43  struct kvm_io_device speaker_dev;
44  struct kvm *kvm;
45  struct kvm_kpit_state pit_state;
46  int irq_source_id;
47  struct kvm_irq_mask_notifier mask_notifier;
48  struct kthread_worker worker;
49  struct task_struct *worker_task;
50  struct kthread_work expired;
51 };
52 
53 #define KVM_PIT_BASE_ADDRESS 0x40
54 #define KVM_SPEAKER_BASE_ADDRESS 0x61
55 #define KVM_PIT_MEM_LENGTH 4
56 #define KVM_PIT_FREQ 1193181
57 #define KVM_MAX_PIT_INTR_INTERVAL HZ / 100
58 #define KVM_PIT_CHANNEL_MASK 0x3
59 
60 void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start);
61 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
62 void kvm_free_pit(struct kvm *kvm);
63 void kvm_pit_reset(struct kvm_pit *pit);
64 
65 #endif
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