arch/x86/kernel/cpu/mce/winchip.c

Source file repositories/reference/linux-study-clean/arch/x86/kernel/cpu/mce/winchip.c

File Facts

System
Linux kernel
Corpus path
arch/x86/kernel/cpu/mce/winchip.c
Extension
.c
Size
1035 bytes
Lines
42
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// 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: */
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;

	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");
}

Annotation

Implementation Notes