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         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