18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Machine specific NMI handling for generic. 48c2ecf20Sopenharmony_ci * Split out from traps.c by Osamu Tomita <tomita@cinet.co.jp> 58c2ecf20Sopenharmony_ci */ 68c2ecf20Sopenharmony_ci#ifndef _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H 78c2ecf20Sopenharmony_ci#define _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ci#include <asm/mc146818rtc.h> 108c2ecf20Sopenharmony_ci 118c2ecf20Sopenharmony_ci#define NMI_REASON_PORT 0x61 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_ci#define NMI_REASON_SERR 0x80 148c2ecf20Sopenharmony_ci#define NMI_REASON_IOCHK 0x40 158c2ecf20Sopenharmony_ci#define NMI_REASON_MASK (NMI_REASON_SERR | NMI_REASON_IOCHK) 168c2ecf20Sopenharmony_ci 178c2ecf20Sopenharmony_ci#define NMI_REASON_CLEAR_SERR 0x04 188c2ecf20Sopenharmony_ci#define NMI_REASON_CLEAR_IOCHK 0x08 198c2ecf20Sopenharmony_ci#define NMI_REASON_CLEAR_MASK 0x0f 208c2ecf20Sopenharmony_ci 218c2ecf20Sopenharmony_cistatic inline unsigned char default_get_nmi_reason(void) 228c2ecf20Sopenharmony_ci{ 238c2ecf20Sopenharmony_ci return inb(NMI_REASON_PORT); 248c2ecf20Sopenharmony_ci} 258c2ecf20Sopenharmony_ci 268c2ecf20Sopenharmony_cistatic inline void reassert_nmi(void) 278c2ecf20Sopenharmony_ci{ 288c2ecf20Sopenharmony_ci int old_reg = -1; 298c2ecf20Sopenharmony_ci 308c2ecf20Sopenharmony_ci if (do_i_have_lock_cmos()) 318c2ecf20Sopenharmony_ci old_reg = current_lock_cmos_reg(); 328c2ecf20Sopenharmony_ci else 338c2ecf20Sopenharmony_ci lock_cmos(0); /* register doesn't matter here */ 348c2ecf20Sopenharmony_ci outb(0x8f, 0x70); 358c2ecf20Sopenharmony_ci inb(0x71); /* dummy */ 368c2ecf20Sopenharmony_ci outb(0x0f, 0x70); 378c2ecf20Sopenharmony_ci inb(0x71); /* dummy */ 388c2ecf20Sopenharmony_ci if (old_reg >= 0) 398c2ecf20Sopenharmony_ci outb(old_reg, 0x70); 408c2ecf20Sopenharmony_ci else 418c2ecf20Sopenharmony_ci unlock_cmos(); 428c2ecf20Sopenharmony_ci} 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ci#endif /* _ASM_X86_MACH_DEFAULT_MACH_TRAPS_H */ 45