1130812Smarcel/* SPDX-License-Identifier: GPL-2.0 */
2130812Smarcel/*
3130812Smarcel *  Machine specific NMI handling for generic.
4130812Smarcel *  Split out from traps.c by Osamu Tomita <tomita@cinet.co.jp>
5130812Smarcel */
6130812Smarcel#ifndef _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
7130812Smarcel#define _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
8130812Smarcel
9130812Smarcel#include <asm/mc146818rtc.h>
10130812Smarcel
11130812Smarcel#define NMI_REASON_PORT		0x61
12130812Smarcel
13130812Smarcel#define NMI_REASON_SERR		0x80
14130812Smarcel#define NMI_REASON_IOCHK	0x40
15130812Smarcel#define NMI_REASON_MASK		(NMI_REASON_SERR | NMI_REASON_IOCHK)
16130812Smarcel
17130812Smarcel#define NMI_REASON_CLEAR_SERR	0x04
18130812Smarcel#define NMI_REASON_CLEAR_IOCHK	0x08
19130812Smarcel#define NMI_REASON_CLEAR_MASK	0x0f
20130812Smarcel
21130812Smarcelstatic inline unsigned char default_get_nmi_reason(void)
22130812Smarcel{
23130812Smarcel	return inb(NMI_REASON_PORT);
24130812Smarcel}
25130812Smarcel
26130812Smarcelstatic inline void reassert_nmi(void)
27130812Smarcel{
28130812Smarcel	int old_reg = -1;
29130812Smarcel
30130812Smarcel	if (do_i_have_lock_cmos())
31130812Smarcel		old_reg = current_lock_cmos_reg();
32130812Smarcel	else
33130812Smarcel		lock_cmos(0); /* register doesn't matter here */
34130812Smarcel	outb(0x8f, 0x70);
35130812Smarcel	inb(0x71);		/* dummy */
36130812Smarcel	outb(0x0f, 0x70);
37130812Smarcel	inb(0x71);		/* dummy */
38130812Smarcel	if (old_reg >= 0)
39130812Smarcel		outb(old_reg, 0x70);
40130812Smarcel	else
41130812Smarcel		unlock_cmos();
42130812Smarcel}
43130812Smarcel
44130812Smarcel#endif /* _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H */
45130812Smarcel