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_kpit_state { 25 struct kvm_kpit_channel_state channels[3]; 26 u32 flags; 27 struct kvm_timer pit_timer; 28 bool is_periodic; 29 u32 speaker_data_on; 30 struct mutex lock; 31 struct kvm_pit *pit; 32 spinlock_t inject_lock; 33 unsigned long irq_ack; 34 struct kvm_irq_ack_notifier irq_ack_notifier; 35 }; 36 37 struct kvm_pit { 38 struct kvm_io_device dev; 39 struct kvm_io_device speaker_dev; 40 struct kvm *kvm; 41 struct kvm_kpit_state pit_state; 42 int irq_source_id; 43 struct kvm_irq_mask_notifier mask_notifier; 44 struct kthread_worker worker; 45 struct task_struct *worker_task; 46 struct kthread_work expired; 47 }; 48 49 #define KVM_PIT_BASE_ADDRESS 0x40 50 #define KVM_SPEAKER_BASE_ADDRESS 0x61 51 #define KVM_PIT_MEM_LENGTH 4 52 #define KVM_PIT_FREQ 1193181 53 #define KVM_MAX_PIT_INTR_INTERVAL HZ / 100 54 #define KVM_PIT_CHANNEL_MASK 0x3 55 56 void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start); 57 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags); 58 void kvm_free_pit(struct kvm *kvm); 59 void kvm_pit_reset(struct kvm_pit *pit); 60 61 #endif 62