arch/x86/kvm/i8254.h

   1 #ifndef __I8254_H
   2 #define __I8254_H
   3
   4 #include <linux/kthread.h>
   5
   6 #include "iodev.h"
   7
   8 struct kvm_kpit_channel_state {
   9         u32 count; /* can be 65536 */
  10         u16 latched_count;
  11         u8 count_latched;
  12         u8 status_latched;
  13         u8 status;
  14         u8 read_state;
  15         u8 write_state;
  16         u8 write_latch;
  17         u8 rw_mode;
  18         u8 mode;
  19         u8 bcd; /* not supported */
  20         u8 gate; /* timer start */
  21         ktime_t count_load_time;
  22 };
  23
  24 struct kvm_pit_timer {
  25         struct hrtimer timer;
  26         s64 period;                             /* unit: ns */
  27         u32 timer_mode_mask;
  28         u64 tscdeadline;
  29         atomic_t pending;                       /* accumulated triggered timers */
  30         bool reinject;
  31         struct kvm_pit_timer_ops *t_ops;
  32         struct kvm *kvm;
  33         struct kvm_vcpu *vcpu;
  34 };
  35
  36 struct kvm_pit_timer_ops {
  37         bool (*is_periodic)(struct kvm_pit_timer *);
  38 };
  39
  40 struct kvm_kpit_state {
  41         struct kvm_kpit_channel_state channels[3];
  42         u32 flags;
  43         struct kvm_pit_timer pit_timer;
  44         bool is_periodic;
  45         u32    speaker_data_on;
  46         struct mutex lock;
  47         struct kvm_pit *pit;
  48         spinlock_t inject_lock;
  49         unsigned long irq_ack;
  50         struct kvm_irq_ack_notifier irq_ack_notifier;
  51 };
  52
  53 struct kvm_pit {
  54         struct kvm_io_device dev;
  55         struct kvm_io_device speaker_dev;
  56         struct kvm *kvm;
  57         struct kvm_kpit_state pit_state;
  58         int irq_source_id;
  59         struct kvm_irq_mask_notifier mask_notifier;
  60         struct kthread_worker worker;
  61         struct task_struct *worker_task;
  62         struct kthread_work expired;
  63 };
  64
  65 #define KVM_PIT_BASE_ADDRESS        0x40
  66 #define KVM_SPEAKER_BASE_ADDRESS    0x61
  67 #define KVM_PIT_MEM_LENGTH          4
  68 #define KVM_PIT_FREQ                1193181
  69 #define KVM_MAX_PIT_INTR_INTERVAL   HZ / 100
  70 #define KVM_PIT_CHANNEL_MASK        0x3
  71
  72 void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start);
  73 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
  74 void kvm_free_pit(struct kvm *kvm);
  75 void kvm_pit_reset(struct kvm_pit *pit);
  76
  77 #endif