arch/x86/kvm/i8254.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __I8254_H
   3 #define __I8254_H
   4
   5 #include <linux/kthread.h>
   6
   7 #include <kvm/iodev.h>
   8
   9 struct kvm_kpit_channel_state {
  10         u32 count; /* can be 65536 */
  11         u16 latched_count;
  12         u8 count_latched;
  13         u8 status_latched;
  14         u8 status;
  15         u8 read_state;
  16         u8 write_state;
  17         u8 write_latch;
  18         u8 rw_mode;
  19         u8 mode;
  20         u8 bcd; /* not supported */
  21         u8 gate; /* timer start */
  22         ktime_t count_load_time;
  23 };
  24
  25 struct kvm_kpit_state {
  26         /* All members before "struct mutex lock" are protected by the lock. */
  27         struct kvm_kpit_channel_state channels[3];
  28         u32 flags;
  29         bool is_periodic;
  30         s64 period;                             /* unit: ns */
  31         struct hrtimer timer;
  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 kthread_work expired;
  49 };
  50
  51 #define KVM_PIT_BASE_ADDRESS        0x40
  52 #define KVM_SPEAKER_BASE_ADDRESS    0x61
  53 #define KVM_PIT_MEM_LENGTH          4
  54 #define KVM_PIT_FREQ                1193181
  55 #define KVM_MAX_PIT_INTR_INTERVAL   HZ / 100
  56 #define KVM_PIT_CHANNEL_MASK        0x3
  57
  58 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
  59 void kvm_free_pit(struct kvm *kvm);
  60
  61 void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val,
  62                 int hpet_legacy_start);
  63 void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject);
  64
  65 #endif