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