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 struct kvm_kpit_channel_state channels[3]; 26 u32 flags; 27 bool is_periodic; 28 s64 period; /* unit: ns */ 29 struct hrtimer timer; 30 atomic_t pending; /* accumulated triggered timers */ 31 bool reinject; 32 struct kvm *kvm; 33 u32 speaker_data_on; 34 struct mutex lock; 35 struct kvm_pit *pit; 36 atomic_t irq_ack; 37 struct kvm_irq_ack_notifier irq_ack_notifier; 38 }; 39 40 struct 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 59 void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start); 60 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags); 61 void kvm_free_pit(struct kvm *kvm); 62 void kvm_pit_reset(struct kvm_pit *pit); 63 64 #endif 65