1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Machine specific NMI handling for generic.
4 * Split out from traps.c by Osamu Tomita <tomita@cinet.co.jp>
5 */
6 #ifndef _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
7 #define _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
8
9 #include <asm/mc146818rtc.h>
10
11 #define NMI_REASON_PORT 0x61
12
13 #define NMI_REASON_SERR 0x80
14 #define NMI_REASON_IOCHK 0x40
15 #define NMI_REASON_MASK (NMI_REASON_SERR | NMI_REASON_IOCHK)
16
17 #define NMI_REASON_CLEAR_SERR 0x04
18 #define NMI_REASON_CLEAR_IOCHK 0x08
19 #define NMI_REASON_CLEAR_MASK 0x0f
20
21 static inline unsigned char default_get_nmi_reason(void)
22 {
23 return inb(NMI_REASON_PORT);
24 }
25
26 static inline void reassert_nmi(void)
27 {
28 int old_reg = -1;
29
30 if (do_i_have_lock_cmos())
31 old_reg = current_lock_cmos_reg();
32 else
33 lock_cmos(0); /* register doesn't matter here */
34 outb(0x8f, 0x70);
35 inb(0x71); /* dummy */
36 outb(0x0f, 0x70);
37 inb(0x71); /* dummy */
38 if (old_reg >= 0)
39 outb(old_reg, 0x70);
40 else
41 unlock_cmos();
42 }
43
44 #endif /* _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H */
45
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