1 #ifndef __I8254_H 2 #define __I8254_H 3 4 #include "iodev.h" 5 6 struct kvm_kpit_channel_state { 7 u32 count; /* can be 65536 */ 8 u16 latched_count; 9 u8 count_latched; 10 u8 status_latched; 11 u8 status; 12 u8 read_state; 13 u8 write_state; 14 u8 write_latch; 15 u8 rw_mode; 16 u8 mode; 17 u8 bcd; /* not supported */ 18 u8 gate; /* timer start */ 19 ktime_t count_load_time; 20 }; 21 22 struct kvm_kpit_state { 23 struct kvm_kpit_channel_state channels[3]; 24 struct kvm_timer pit_timer; 25 bool is_periodic; 26 u32 speaker_data_on; 27 struct mutex lock; 28 struct kvm_pit *pit; 29 spinlock_t inject_lock; 30 unsigned long irq_ack; 31 struct kvm_irq_ack_notifier irq_ack_notifier; 32 }; 33 34 struct kvm_pit { 35 unsigned long base_addresss; 36 struct kvm_io_device dev; 37 struct kvm_io_device speaker_dev; 38 struct kvm *kvm; 39 struct kvm_kpit_state pit_state; 40 int irq_source_id; 41 struct kvm_irq_mask_notifier mask_notifier; 42 }; 43 44 #define KVM_PIT_BASE_ADDRESS 0x40 45 #define KVM_SPEAKER_BASE_ADDRESS 0x61 46 #define KVM_PIT_MEM_LENGTH 4 47 #define KVM_PIT_FREQ 1193181 48 #define KVM_MAX_PIT_INTR_INTERVAL HZ / 100 49 #define KVM_PIT_CHANNEL_MASK 0x3 50 51 void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu); 52 void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val); 53 struct kvm_pit *kvm_create_pit(struct kvm *kvm); 54 void kvm_free_pit(struct kvm *kvm); 55 void kvm_pit_reset(struct kvm_pit *pit); 56 57 #endif 58