i8254.h revision 0be839bfb4b12f17fba2d982353b0f674e327f9e 
1#ifndef __I8254_H
2#define __I8254_H
3
4#include "iodev.h"
5
6struct 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
22struct 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
35struct 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
53void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu);
54void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start);
55struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
56void kvm_free_pit(struct kvm *kvm);
57void kvm_pit_reset(struct kvm_pit *pit);
58
59#endif
60