1 #ifndef __I8254_H 2 #define __I8254_H 3 4 #include "iodev.h" 5 6 struct kvm_kpit_timer { 7 struct hrtimer timer; 8 int irq; 9 s64 period; /* unit: ns */ 10 s64 scheduled; 11 atomic_t pending; 12 }; 13 14 struct kvm_kpit_channel_state { 15 u32 count; /* can be 65536 */ 16 u16 latched_count; 17 u8 count_latched; 18 u8 status_latched; 19 u8 status; 20 u8 read_state; 21 u8 write_state; 22 u8 write_latch; 23 u8 rw_mode; 24 u8 mode; 25 u8 bcd; /* not supported */ 26 u8 gate; /* timer start */ 27 ktime_t count_load_time; 28 }; 29 30 struct kvm_kpit_state { 31 struct kvm_kpit_channel_state channels[3]; 32 struct kvm_kpit_timer pit_timer; 33 u32 speaker_data_on; 34 struct mutex lock; 35 struct kvm_pit *pit; 36 spinlock_t inject_lock; 37 unsigned long irq_ack; 38 struct kvm_irq_ack_notifier irq_ack_notifier; 39 }; 40 41 struct kvm_pit { 42 unsigned long base_addresss; 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 }; 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_inject_pit_timer_irqs(struct kvm_vcpu *vcpu); 57 void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val); 58 struct kvm_pit *kvm_create_pit(struct kvm *kvm); 59 void kvm_free_pit(struct kvm *kvm); 60 void kvm_pit_reset(struct kvm_pit *pit); 61 62 #endif 63