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_kpit_state {
  25         struct kvm_kpit_channel_state channels[3];
  26         u32 flags;
  27         struct kvm_timer pit_timer;
  28         bool is_periodic;
  29         u32    speaker_data_on;
  30         struct mutex lock;
  31         struct kvm_pit *pit;
  32         spinlock_t inject_lock;
  33         unsigned long irq_ack;
  34         struct kvm_irq_ack_notifier irq_ack_notifier;
  35 };
  36
  37 struct kvm_pit {
  38         struct kvm_io_device dev;
  39         struct kvm_io_device speaker_dev;
  40         struct kvm *kvm;
  41         struct kvm_kpit_state pit_state;
  42         int irq_source_id;
  43         struct kvm_irq_mask_notifier mask_notifier;
  44         struct kthread_worker worker;
  45         struct task_struct *worker_task;
  46         struct kthread_work expired;
  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_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start);
  57 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
  58 void kvm_free_pit(struct kvm *kvm);
  59 void kvm_pit_reset(struct kvm_pit *pit);
  60
  61 #endif