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 ktime_t last_update; 12 atomic_t pending; 13 }; 14 15 struct kvm_kpit_channel_state { 16 u32 count; /* can be 65536 */ 17 u16 latched_count; 18 u8 count_latched; 19 u8 status_latched; 20 u8 status; 21 u8 read_state; 22 u8 write_state; 23 u8 write_latch; 24 u8 rw_mode; 25 u8 mode; 26 u8 bcd; /* not supported */ 27 u8 gate; /* timer start */ 28 ktime_t count_load_time; 29 }; 30 31 struct kvm_kpit_state { 32 struct kvm_kpit_channel_state channels[3]; 33 struct kvm_kpit_timer pit_timer; 34 u32 speaker_data_on; 35 struct mutex lock; 36 struct kvm_pit *pit; 37 bool inject_pending; /* if inject pending interrupts */ 38 unsigned long last_injected_time; 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_timer_intr_post(struct kvm_vcpu *vcpu, int vec); 58 void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val); 59 struct kvm_pit *kvm_create_pit(struct kvm *kvm); 60 void kvm_free_pit(struct kvm *kvm); 61 void kvm_pit_reset(struct kvm_pit *pit); 62 63 #endif 64