linux/arch/x86/include/asm/nmi.h

#ifndef _ASM_X86_NMI_H
#define _ASM_X86_NMI_H

#include <linux/pm.h>
#include <asm/irq.h>
#include <asm/io.h>

#ifdef CONFIG_X86_LOCAL_APIC

extern int avail_to_resrv_perfctr_nmi_bit(unsigned int);
extern int reserve_perfctr_nmi(unsigned int);
extern void release_perfctr_nmi(unsigned int);
extern int reserve_evntsel_nmi(unsigned int);
extern void release_evntsel_nmi(unsigned int);

struct ctl_table;
extern int proc_nmi_enabled(struct ctl_table *, int ,
			void __user *, size_t *, loff_t *);
extern int unknown_nmi_panic;

void arch_trigger_all_cpu_backtrace(void);
#define arch_trigger_all_cpu_backtrace arch_trigger_all_cpu_backtrace
#endif

#define NMI_FLAG_FIRST	1

enum {
	NMI_LOCAL=0,
	NMI_UNKNOWN,
	NMI_SERR,
	NMI_IO_CHECK,
	NMI_MAX
};

#define NMI_DONE	0
#define NMI_HANDLED	1

typedef int (*nmi_handler_t)(unsigned int, struct pt_regs *);

struct nmiaction {
	struct list_head	list;
	nmi_handler_t		handler;
	unsigned long		flags;
	const char		*name;
};

#define register_nmi_handler(t, fn, fg, n)		\
({							\
	static struct nmiaction fn##_na = {		\
		.handler = (fn),			\
		.name = (n),				\
		.flags = (fg),				\
	};						\
	__register_nmi_handler((t), &fn##_na);	\
})

/*
 * For special handlers that register/unregister in the
 * init section only.  This should be considered rare.
 */
#define register_nmi_handler_initonly(t, fn, fg, n)		\
({							\
	static struct nmiaction fn##_na __initdata = {		\
		.handler = (fn),			\
		.name = (n),				\
		.flags = (fg),				\
	};						\
	__register_nmi_handler((t), &fn##_na);	\
})

int __register_nmi_handler(unsigned int, struct nmiaction *);

void unregister_nmi_handler(unsigned int, const char *);

void stop_nmi(void);
void restart_nmi(void);
void local_touch_nmi(void);

#endif /* _ASM_X86_NMI_H */