tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start);
54struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
55void kvm_free_pit(struct kvm *kvm);
56void kvm_pit_reset(struct kvm_pit *pit);
57
58#endif