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Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kvm/i8254.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/arch/x86/kvm/i8254.h b/arch/x86/kvm/i8254.h new file mode 100644 index 000000000..a768212ba --- /dev/null +++ b/arch/x86/kvm/i8254.h @@ -0,0 +1,65 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __I8254_H +#define __I8254_H + +#include <linux/kthread.h> + +#include <kvm/iodev.h> + +struct kvm_kpit_channel_state { + u32 count; /* can be 65536 */ + u16 latched_count; + u8 count_latched; + u8 status_latched; + u8 status; + u8 read_state; + u8 write_state; + u8 write_latch; + u8 rw_mode; + u8 mode; + u8 bcd; /* not supported */ + u8 gate; /* timer start */ + ktime_t count_load_time; +}; + +struct kvm_kpit_state { + /* All members before "struct mutex lock" are protected by the lock. */ + struct kvm_kpit_channel_state channels[3]; + u32 flags; + bool is_periodic; + s64 period; /* unit: ns */ + struct hrtimer timer; + + struct mutex lock; + atomic_t reinject; + atomic_t pending; /* accumulated triggered timers */ + atomic_t irq_ack; + struct kvm_irq_ack_notifier irq_ack_notifier; +}; + +struct kvm_pit { + struct kvm_io_device dev; + struct kvm_io_device speaker_dev; + struct kvm *kvm; + struct kvm_kpit_state pit_state; + int irq_source_id; + struct kvm_irq_mask_notifier mask_notifier; + struct kthread_worker *worker; + struct kthread_work expired; +}; + +#define KVM_PIT_BASE_ADDRESS 0x40 +#define KVM_SPEAKER_BASE_ADDRESS 0x61 +#define KVM_PIT_MEM_LENGTH 4 +#define KVM_PIT_FREQ 1193181 +#define KVM_MAX_PIT_INTR_INTERVAL HZ / 100 +#define KVM_PIT_CHANNEL_MASK 0x3 + +struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags); +void kvm_free_pit(struct kvm *kvm); + +void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val, + int hpet_legacy_start); +void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject); + +#endif |