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// SPDX-License-Identifier: GPL-2.0
/*
* IDT Winchip specific Machine Check Exception Reporting
* (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk>
*/
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/hardirq.h>
#include <asm/processor.h>
#include <asm/traps.h>
#include <asm/tlbflush.h>
#include <asm/mce.h>
#include <asm/msr.h>
#include "internal.h"
/* Machine check handler for WinChip C6: */
static noinstr void winchip_machine_check(struct pt_regs *regs)
{
instrumentation_begin();
pr_emerg("CPU0: Machine Check Exception.\n");
add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
instrumentation_end();
}
/* Set up machine check reporting on the Winchip C6 series */
void winchip_mcheck_init(struct cpuinfo_x86 *c)
{
u32 lo, hi;
machine_check_vector = winchip_machine_check;
/* Make sure the vector pointer is visible before we enable MCEs: */
wmb();
rdmsr(MSR_IDT_FCR1, lo, hi);
lo |= (1<<2); /* Enable EIERRINT (int 18 MCE) */
lo &= ~(1<<4); /* Enable MCE */
wrmsr(MSR_IDT_FCR1, lo, hi);
cr4_set_bits(X86_CR4_MCE);
pr_info("Winchip machine check reporting enabled on CPU#0.\n");
}
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