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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Machine specific NMI handling for generic.
3 * Split out from traps.c by Osamu Tomita <tomita@cinet.co.jp>
4 */
H. Peter Anvin05e4d312008-10-23 00:01:39 -07005#ifndef _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
6#define _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H
Linus Torvalds1da177e2005-04-16 15:20:36 -07007
8#include <asm/mc146818rtc.h>
9
Huang Ying1c7b74d2011-01-06 16:18:47 -050010#define NMI_REASON_PORT 0x61
11
12#define NMI_REASON_SERR 0x80
13#define NMI_REASON_IOCHK 0x40
14#define NMI_REASON_MASK (NMI_REASON_SERR | NMI_REASON_IOCHK)
15
16#define NMI_REASON_CLEAR_SERR 0x04
17#define NMI_REASON_CLEAR_IOCHK 0x08
18#define NMI_REASON_CLEAR_MASK 0x0f
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020static inline unsigned char get_nmi_reason(void)
21{
Huang Ying1c7b74d2011-01-06 16:18:47 -050022 return inb(NMI_REASON_PORT);
Linus Torvalds1da177e2005-04-16 15:20:36 -070023}
24
25static inline void reassert_nmi(void)
26{
27 int old_reg = -1;
28
29 if (do_i_have_lock_cmos())
30 old_reg = current_lock_cmos_reg();
31 else
32 lock_cmos(0); /* register doesn't matter here */
33 outb(0x8f, 0x70);
34 inb(0x71); /* dummy */
35 outb(0x0f, 0x70);
36 inb(0x71); /* dummy */
37 if (old_reg >= 0)
38 outb(old_reg, 0x70);
39 else
40 unlock_cmos();
41}
42
H. Peter Anvin05e4d312008-10-23 00:01:39 -070043#endif /* _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H */