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(value: 0x8f, port: 0x70); |
35 | inb(port: 0x71); /* dummy */ |
36 | outb(value: 0x0f, port: 0x70); |
37 | inb(port: 0x71); /* dummy */ |
38 | if (old_reg >= 0) |
39 | outb(value: old_reg, port: 0x70); |
40 | else |
41 | unlock_cmos(); |
42 | } |
43 | |
44 | #endif /* _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H */ |
45 | |