1#ifndef __I8254_H 2#define __I8254_H 3 4#include <linux/kthread.h> 5 6#include <kvm/iodev.h> 7 8struct 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 24struct kvm_kpit_state { 25 /* All members before "struct mutex lock" are protected by the lock. */ 26 struct kvm_kpit_channel_state channels[3]; 27 u32 flags; 28 bool is_periodic; 29 s64 period; /* unit: ns */ 30 struct hrtimer timer; 31 u32 speaker_data_on; 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 40struct 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 task_struct *worker_task; 49 struct kthread_work expired; 50}; 51 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 58 59struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags); 60void kvm_free_pit(struct kvm *kvm); 61 62void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val, 63 int hpet_legacy_start); 64void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject); 65 66#endif 67