1  /* SPDX-License-Identifier: GPL-2.0 */
2  #ifndef _ASM_X86_NMI_H
3  #define _ASM_X86_NMI_H
4  
5  #include <linux/irq_work.h>
6  #include <linux/pm.h>
7  #include <asm/irq.h>
8  #include <asm/io.h>
9  
10  #ifdef CONFIG_X86_LOCAL_APIC
11  
12  extern int reserve_perfctr_nmi(unsigned int);
13  extern void release_perfctr_nmi(unsigned int);
14  extern int reserve_evntsel_nmi(unsigned int);
15  extern void release_evntsel_nmi(unsigned int);
16  
17  struct ctl_table;
18  extern int proc_nmi_enabled(struct ctl_table *, int ,
19  			void __user *, size_t *, loff_t *);
20  extern int unknown_nmi_panic;
21  
22  #endif /* CONFIG_X86_LOCAL_APIC */
23  
24  #define NMI_FLAG_FIRST	1
25  
26  enum {
27  	NMI_LOCAL=0,
28  	NMI_UNKNOWN,
29  	NMI_SERR,
30  	NMI_IO_CHECK,
31  	NMI_MAX
32  };
33  
34  #define NMI_DONE	0
35  #define NMI_HANDLED	1
36  
37  typedef int (*nmi_handler_t)(unsigned int, struct pt_regs *);
38  
39  struct nmiaction {
40  	struct list_head	list;
41  	nmi_handler_t		handler;
42  	u64			max_duration;
43  	unsigned long		flags;
44  	const char		*name;
45  };
46  
47  #define register_nmi_handler(t, fn, fg, n, init...)	\
48  ({							\
49  	static struct nmiaction init fn##_na = {	\
50  		.list = LIST_HEAD_INIT(fn##_na.list),	\
51  		.handler = (fn),			\
52  		.name = (n),				\
53  		.flags = (fg),				\
54  	};						\
55  	__register_nmi_handler((t), &fn##_na);		\
56  })
57  
58  int __register_nmi_handler(unsigned int, struct nmiaction *);
59  
60  void unregister_nmi_handler(unsigned int, const char *);
61  
62  void stop_nmi(void);
63  void restart_nmi(void);
64  void local_touch_nmi(void);
65  
66  #endif /* _ASM_X86_NMI_H */
67