winchip.c

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/*
 * IDT Winchip specific Machine Check Exception Reporting
 * (C) Copyright 2002 Alan Cox <[email protected]>
 */
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>

#include <asm/processor.h>
#include <asm/mce.h>
#include <asm/msr.h>

/* Machine check handler for WinChip C6: */
static void winchip_machine_check(struct pt_regs *regs, long error_code)
{
    printk(KERN_EMERG "CPU0: Machine Check Exception.\n");
    add_taint(TAINT_MACHINE_CHECK);
}

/* 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);

    set_in_cr4(X86_CR4_MCE);

    printk(KERN_INFO
           "Winchip machine check reporting enabled on CPU#0.\n");
}