linux/arch/x86/kvm/i8254.h
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   1#ifndef __I8254_H
   2#define __I8254_H
   3
   4#include "iodev.h"
   5
   6struct 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
  15struct 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
  31struct 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
  41struct 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
  56void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu);
  57void kvm_pit_timer_intr_post(struct kvm_vcpu *vcpu, int vec);
  58void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val);
  59struct kvm_pit *kvm_create_pit(struct kvm *kvm);
  60void kvm_free_pit(struct kvm *kvm);
  61void kvm_pit_reset(struct kvm_pit *pit);
  62
  63#endif
  64