1 #ifndef __I8254_H 2 #define __I8254_H 3 4 #include <linux/kthread.h> 5 6 #include <kvm/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 /* 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 struct kvm *kvm; 35 struct kvm_pit *pit; 36 bool reinject; 37 atomic_t pending; /* accumulated triggered timers */ 38 atomic_t irq_ack; 39 struct kvm_irq_ack_notifier irq_ack_notifier; 40 }; 41 42 struct kvm_pit { 43 struct kvm_io_device dev; 44 struct kvm_io_device speaker_dev; 45 struct kvm *kvm; 46 struct kvm_kpit_state pit_state; 47 int irq_source_id; 48 struct kvm_irq_mask_notifier mask_notifier; 49 struct kthread_worker worker; 50 struct task_struct *worker_task; 51 struct kthread_work expired; 52 }; 53 54 #define KVM_PIT_BASE_ADDRESS 0x40 55 #define KVM_SPEAKER_BASE_ADDRESS 0x61 56 #define KVM_PIT_MEM_LENGTH 4 57 #define KVM_PIT_FREQ 1193181 58 #define KVM_MAX_PIT_INTR_INTERVAL HZ / 100 59 #define KVM_PIT_CHANNEL_MASK 0x3 60 61 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags); 62 void kvm_free_pit(struct kvm *kvm); 63 64 void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val, 65 int hpet_legacy_start); 66 67 #endif 68