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
20static inline unsigned char get_nmi_reason(void)
21{
22	return inb(NMI_REASON_PORT);
23}
24
25static 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 */