cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mach_traps.h (1013B)

      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
     21static inline unsigned char default_get_nmi_reason(void)
     22{
     23	return inb(NMI_REASON_PORT);
     24}
     25
     26static 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 */