1 #ifndef __I8254_H 2 #define __I8254_H 3 4 #include <linux/kthread.h> 5 6 #include "iodev.h" 7 8 struct 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 24 struct kvm_pit_timer { 25 struct hrtimer timer; 26 s64 period; /* unit: ns */ 27 u32 timer_mode_mask; 28 u64 tscdeadline; 29 atomic_t pending; /* accumulated triggered timers */ 30 bool reinject; 31 struct kvm_pit_timer_ops *t_ops; 32 struct kvm *kvm; 33 struct kvm_vcpu *vcpu; 34 }; 35 36 struct kvm_pit_timer_ops { 37 bool (*is_periodic)(struct kvm_pit_timer *); 38 }; 39 40 struct kvm_kpit_state { 41 struct kvm_kpit_channel_state channels[3]; 42 u32 flags; 43 struct kvm_pit_timer pit_timer; 44 bool is_periodic; 45 u32 speaker_data_on; 46 struct mutex lock; 47 struct kvm_pit *pit; 48 spinlock_t inject_lock; 49 unsigned long irq_ack; 50 struct kvm_irq_ack_notifier irq_ack_notifier; 51 }; 52 53 struct kvm_pit { 54 struct kvm_io_device dev; 55 struct kvm_io_device speaker_dev; 56 struct kvm *kvm; 57 struct kvm_kpit_state pit_state; 58 int irq_source_id; 59 struct kvm_irq_mask_notifier mask_notifier; 60 struct kthread_worker worker; 61 struct task_struct *worker_task; 62 struct kthread_work expired; 63 }; 64 65 #define KVM_PIT_BASE_ADDRESS 0x40 66 #define KVM_SPEAKER_BASE_ADDRESS 0x61 67 #define KVM_PIT_MEM_LENGTH 4 68 #define KVM_PIT_FREQ 1193181 69 #define KVM_MAX_PIT_INTR_INTERVAL HZ / 100 70 #define KVM_PIT_CHANNEL_MASK 0x3 71 72 void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start); 73 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags); 74 void kvm_free_pit(struct kvm *kvm); 75 void kvm_pit_reset(struct kvm_pit *pit); 76 77 #endif 78