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 66