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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winchip.c (1035B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * IDT Winchip specific Machine Check Exception Reporting
      4 * (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk>
      5 */
      6#include <linux/interrupt.h>
      7#include <linux/kernel.h>
      8#include <linux/types.h>
      9#include <linux/hardirq.h>
     10
     11#include <asm/processor.h>
     12#include <asm/traps.h>
     13#include <asm/tlbflush.h>
     14#include <asm/mce.h>
     15#include <asm/msr.h>
     16
     17#include "internal.h"
     18
     19/* Machine check handler for WinChip C6: */
     20noinstr void winchip_machine_check(struct pt_regs *regs)
     21{
     22	instrumentation_begin();
     23	pr_emerg("CPU0: Machine Check Exception.\n");
     24	add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
     25	instrumentation_end();
     26}
     27
     28/* Set up machine check reporting on the Winchip C6 series */
     29void winchip_mcheck_init(struct cpuinfo_x86 *c)
     30{
     31	u32 lo, hi;
     32
     33	rdmsr(MSR_IDT_FCR1, lo, hi);
     34	lo |= (1<<2);	/* Enable EIERRINT (int 18 MCE) */
     35	lo &= ~(1<<4);	/* Enable MCE */
     36	wrmsr(MSR_IDT_FCR1, lo, hi);
     37
     38	cr4_set_bits(X86_CR4_MCE);
     39
     40	pr_info("Winchip machine check reporting enabled on CPU#0.\n");
     41}