arch/x86/kvm/i8254.h

   1 #ifndef __I8254_H
   2 #define __I8254_H
   3
   4 #include <linux/kthread.h>
   5
   6 #include <kvm/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         /* All members before "struct mutex lock" are protected by the lock. */
  26         struct kvm_kpit_channel_state channels[3];
  27         u32 flags;
  28         bool is_periodic;
  29         s64 period;                             /* unit: ns */
  30         struct hrtimer timer;
  31         u32    speaker_data_on;
  32
  33         struct mutex lock;
  34         atomic_t reinject;
  35         atomic_t pending; /* accumulated triggered timers */
  36         atomic_t irq_ack;
  37         struct kvm_irq_ack_notifier irq_ack_notifier;
  38 };
  39
  40 struct kvm_pit {
  41         struct kvm_io_device dev;
  42         struct kvm_io_device speaker_dev;
  43         struct kvm *kvm;
  44         struct kvm_kpit_state pit_state;
  45         int irq_source_id;
  46         struct kvm_irq_mask_notifier mask_notifier;
  47         struct kthread_worker worker;
  48         struct task_struct *worker_task;
  49         struct kthread_work expired;
  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 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
  60 void kvm_free_pit(struct kvm *kvm);
  61
  62 void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val,
  63                 int hpet_legacy_start);
  64 void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject);
  65
  66 #endif