| /* 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 */ |
