arch/x86/kvm/i8254.h

   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         bool reinject;
  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         spinlock_t inject_lock;
  38         unsigned long irq_ack;
  39         struct kvm_irq_ack_notifier irq_ack_notifier;
  40 };
  41
  42 struct kvm_pit {
  43         unsigned long base_addresss;
  44         struct kvm_io_device dev;
  45         struct kvm_io_device speaker_dev;
  46         struct kvm *kvm;
  47         struct kvm_kpit_state pit_state;
  48         int irq_source_id;
  49         struct kvm_irq_mask_notifier mask_notifier;
  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_inject_pit_timer_irqs(struct kvm_vcpu *vcpu);
  60 void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val);
  61 struct kvm_pit *kvm_create_pit(struct kvm *kvm);
  62 void kvm_free_pit(struct kvm *kvm);
  63 void kvm_pit_reset(struct kvm_pit *pit);
  64
  65 #endif