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