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1 /*
2  *  Machine specific NMI handling for generic.
3  *  Split out from traps.c by Osamu Tomita <tomita@cinet.co.jp>
4  */
5 #ifndef _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
6 #define _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
7 
8 #include <asm/mc146818rtc.h>
9 
10 #define NMI_REASON_PORT		0x61
11 
12 #define NMI_REASON_SERR		0x80
13 #define NMI_REASON_IOCHK	0x40
14 #define NMI_REASON_MASK		(NMI_REASON_SERR | NMI_REASON_IOCHK)
15 
16 #define NMI_REASON_CLEAR_SERR	0x04
17 #define NMI_REASON_CLEAR_IOCHK	0x08
18 #define NMI_REASON_CLEAR_MASK	0x0f
19 
default_get_nmi_reason(void)20 static inline unsigned char default_get_nmi_reason(void)
21 {
22 	return inb(NMI_REASON_PORT);
23 }
24 
reassert_nmi(void)25 static inline void reassert_nmi(void)
26 {
27 	int old_reg = -1;
28 
29 	if (do_i_have_lock_cmos())
30 		old_reg = current_lock_cmos_reg();
31 	else
32 		lock_cmos(0); /* register doesn't matter here */
33 	outb(0x8f, 0x70);
34 	inb(0x71);		/* dummy */
35 	outb(0x0f, 0x70);
36 	inb(0x71);		/* dummy */
37 	if (old_reg >= 0)
38 		outb(old_reg, 0x70);
39 	else
40 		unlock_cmos();
41 }
42 
43 #endif /* _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H */
44