1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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2 | #ifndef __I8254_H |
3 | #define __I8254_H |
4 | |
5 | #include <linux/kthread.h> |
6 | |
7 | #include <kvm/iodev.h> |
8 | |
9 | struct kvm_kpit_channel_state { |
10 | u32 count; /* can be 65536 */ |
11 | u16 latched_count; |
12 | u8 count_latched; |
13 | u8 status_latched; |
14 | u8 status; |
15 | u8 read_state; |
16 | u8 write_state; |
17 | u8 write_latch; |
18 | u8 rw_mode; |
19 | u8 mode; |
20 | u8 bcd; /* not supported */ |
21 | u8 gate; /* timer start */ |
22 | ktime_t count_load_time; |
23 | }; |
24 | |
25 | struct kvm_kpit_state { |
26 | /* All members before "struct mutex lock" are protected by the lock. */ |
27 | struct kvm_kpit_channel_state channels[3]; |
28 | u32 flags; |
29 | bool is_periodic; |
30 | s64 period; /* unit: ns */ |
31 | struct hrtimer timer; |
32 | |
33 | struct mutex lock; |
34 | atomic_t reinject; |
35 | atomic_t pending; /* accumulated triggered timers */ |
36 | atomic_t irq_ack; |
37 | struct kvm_irq_ack_notifier irq_ack_notifier; |
38 | }; |
39 | |
40 | struct kvm_pit { |
41 | struct kvm_io_device dev; |
42 | struct kvm_io_device speaker_dev; |
43 | struct kvm *kvm; |
44 | struct kvm_kpit_state pit_state; |
45 | int irq_source_id; |
46 | struct kvm_irq_mask_notifier mask_notifier; |
47 | struct kthread_worker *worker; |
48 | struct kthread_work expired; |
49 | }; |
50 | |
51 | #define KVM_PIT_BASE_ADDRESS 0x40 |
52 | #define KVM_SPEAKER_BASE_ADDRESS 0x61 |
53 | #define KVM_PIT_MEM_LENGTH 4 |
54 | #define KVM_PIT_FREQ 1193181 |
55 | #define KVM_MAX_PIT_INTR_INTERVAL HZ / 100 |
56 | #define KVM_PIT_CHANNEL_MASK 0x3 |
57 | |
58 | struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags); |
59 | void kvm_free_pit(struct kvm *kvm); |
60 | |
61 | void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val, |
62 | int hpet_legacy_start); |
63 | void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject); |
64 | |
65 | #endif |
66 |