1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/kthread.h>
9 struct kvm_kpit_channel_state {
10 u32 count; /* can be 65536 */
20 u8 bcd; /* not supported */
21 u8 gate; /* timer start */
22 ktime_t count_load_time;
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];
30 s64 period; /* unit: ns */
36 atomic_t pending; /* accumulated triggered timers */
38 struct kvm_irq_ack_notifier irq_ack_notifier;
42 struct kvm_io_device dev;
43 struct kvm_io_device speaker_dev;
45 struct kvm_kpit_state pit_state;
47 struct kvm_irq_mask_notifier mask_notifier;
48 struct kthread_worker *worker;
49 struct kthread_work expired;
52 #define KVM_PIT_BASE_ADDRESS 0x40
53 #define KVM_SPEAKER_BASE_ADDRESS 0x61
54 #define KVM_PIT_MEM_LENGTH 4
55 #define KVM_PIT_FREQ 1193181
56 #define KVM_MAX_PIT_INTR_INTERVAL HZ / 100
57 #define KVM_PIT_CHANNEL_MASK 0x3
59 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
60 void kvm_free_pit(struct kvm *kvm);
62 void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val,
63 int hpet_legacy_start);
64 void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject);