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winchip.c

/*
 * IDT Winchip specific Machine Check Exception Reporting
 * (C) Copyright 2002 Alan Cox <alan@redhat.com>
 */

#include <linux/init.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>

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

#include "mce.h"

/* Machine check handler for WinChip C6 */
static fastcall 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;
      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");
}

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