arch/x86/kvm/i8254.h

Source file repositories/reference/linux-study-clean/arch/x86/kvm/i8254.h

File Facts

System
Linux kernel
Corpus path
arch/x86/kvm/i8254.h
Extension
.h
Size
1856 bytes
Lines
73
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

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;
	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

int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps);
int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps);
int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps);
int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps);
int kvm_vm_ioctl_reinject(struct kvm *kvm, struct kvm_reinject_control *control);

struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
void kvm_free_pit(struct kvm *kvm);
#endif /* CONFIG_KVM_IOAPIC */

#endif

Annotation

Implementation Notes