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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Machine specific NMI handling for generic.
* Split out from traps.c by Osamu Tomita <tomita@cinet.co.jp>
*/
#ifndef _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
#define _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
#include <asm/mc146818rtc.h>
#define NMI_REASON_PORT 0x61
#define NMI_REASON_SERR 0x80
#define NMI_REASON_IOCHK 0x40
#define NMI_REASON_MASK (NMI_REASON_SERR | NMI_REASON_IOCHK)
#define NMI_REASON_CLEAR_SERR 0x04
#define NMI_REASON_CLEAR_IOCHK 0x08
#define NMI_REASON_CLEAR_MASK 0x0f
static inline unsigned char default_get_nmi_reason(void)
{
return inb(NMI_REASON_PORT);
}
static inline void reassert_nmi(void)
{
int old_reg = -1;
if (do_i_have_lock_cmos())
old_reg = current_lock_cmos_reg();
else
lock_cmos(0); /* register doesn't matter here */
outb(0x8f, 0x70);
inb(0x71); /* dummy */
outb(0x0f, 0x70);
inb(0x71); /* dummy */
if (old_reg >= 0)
outb(old_reg, 0x70);
else
unlock_cmos();
}
#endif /* _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H */