arch/x86/kvm/i8254.h

   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         u32 flags;
  25         struct kvm_timer pit_timer;
  26         bool is_periodic;
  27         u32    speaker_data_on;
  28         struct mutex lock;
  29         struct kvm_pit *pit;
  30         spinlock_t inject_lock;
  31         unsigned long irq_ack;
  32         struct kvm_irq_ack_notifier irq_ack_notifier;
  33 };
  34
  35 struct kvm_pit {
  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         struct workqueue_struct *wq;
  43         struct work_struct expired;
  44 };
  45
  46 #define KVM_PIT_BASE_ADDRESS        0x40
  47 #define KVM_SPEAKER_BASE_ADDRESS    0x61
  48 #define KVM_PIT_MEM_LENGTH          4
  49 #define KVM_PIT_FREQ                1193181
  50 #define KVM_MAX_PIT_INTR_INTERVAL   HZ / 100
  51 #define KVM_PIT_CHANNEL_MASK        0x3
  52
  53 void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start);
  54 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
  55 void kvm_free_pit(struct kvm *kvm);
  56 void kvm_pit_reset(struct kvm_pit *pit);
  57
  58 #endif