45 lines
1013 B
C
45 lines
1013 B
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Machine specific NMI handling for generic.
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* Split out from traps.c by Osamu Tomita <tomita@cinet.co.jp>
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*/
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#ifndef _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
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#define _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
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#include <asm/mc146818rtc.h>
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#define NMI_REASON_PORT 0x61
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#define NMI_REASON_SERR 0x80
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#define NMI_REASON_IOCHK 0x40
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#define NMI_REASON_MASK (NMI_REASON_SERR | NMI_REASON_IOCHK)
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#define NMI_REASON_CLEAR_SERR 0x04
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#define NMI_REASON_CLEAR_IOCHK 0x08
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#define NMI_REASON_CLEAR_MASK 0x0f
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static inline unsigned char default_get_nmi_reason(void)
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{
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return inb(NMI_REASON_PORT);
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}
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static inline void reassert_nmi(void)
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{
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int old_reg = -1;
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if (do_i_have_lock_cmos())
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old_reg = current_lock_cmos_reg();
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else
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lock_cmos(0); /* register doesn't matter here */
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outb(0x8f, 0x70);
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inb(0x71); /* dummy */
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outb(0x0f, 0x70);
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inb(0x71); /* dummy */
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if (old_reg >= 0)
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outb(old_reg, 0x70);
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else
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unlock_cmos();
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}
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#endif /* _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H */
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