1. 根目录:
2. arch
3. x86
4. include
5. asm
6. irqdomain.h

#ifndef _ASM_IRQDOMAIN_H
#define _ASM_IRQDOMAIN_H

#include <linux/irqdomain.h>
#include <asm/hw_irq.h>

#ifdef CONFIG_X86_LOCAL_APIC
enum {
	/* Allocate contiguous CPU vectors */
	X86_IRQ_ALLOC_CONTIGUOUS_VECTORS		= 0x1,
};

extern struct irq_domain *x86_vector_domain;

extern void init_irq_alloc_info(struct irq_alloc_info *info,
				const struct cpumask *mask);
extern void copy_irq_alloc_info(struct irq_alloc_info *dst,
				struct irq_alloc_info *src);
#endif /* CONFIG_X86_LOCAL_APIC */

#ifdef CONFIG_X86_IO_APIC
struct device_node;
struct irq_data;

enum ioapic_domain_type {
	IOAPIC_DOMAIN_INVALID,
	IOAPIC_DOMAIN_LEGACY,
	IOAPIC_DOMAIN_STRICT,
	IOAPIC_DOMAIN_DYNAMIC,
};

struct ioapic_domain_cfg {
	enum ioapic_domain_type		type;
	const struct irq_domain_ops	*ops;
	struct device_node		*dev;
};

extern const struct irq_domain_ops mp_ioapic_irqdomain_ops;

extern int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
			      unsigned int nr_irqs, void *arg);
extern void mp_irqdomain_free(struct irq_domain *domain, unsigned int virq,
			      unsigned int nr_irqs);
extern void mp_irqdomain_activate(struct irq_domain *domain,
				  struct irq_data *irq_data);
extern void mp_irqdomain_deactivate(struct irq_domain *domain,
				    struct irq_data *irq_data);
extern int mp_irqdomain_ioapic_idx(struct irq_domain *domain);
#endif /* CONFIG_X86_IO_APIC */

#ifdef CONFIG_PCI_MSI
extern void arch_init_msi_domain(struct irq_domain *domain);
#else
static inline void arch_init_msi_domain(struct irq_domain *domain) { }
#endif

#ifdef CONFIG_HT_IRQ
extern void arch_init_htirq_domain(struct irq_domain *domain);
#else
static inline void arch_init_htirq_domain(struct irq_domain *domain) { }
#endif

#endif