LXR linux/arch/x86/kernel/cpu/mcheck/winchip.c

   1/*
   2 * IDT Winchip specific Machine Check Exception Reporting
   3 * (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk>
   4 */
   5#include <linux/interrupt.h>
   6#include <linux/kernel.h>
   7#include <linux/types.h>
   8#include <linux/init.h>
   9
  10#include <asm/processor.h>
  11#include <asm/system.h>
  12#include <asm/mce.h>
  13#include <asm/msr.h>
  14
  15/* Machine check handler for WinChip C6: */
  16static void winchip_machine_check(struct pt_regs *regs, long error_code)
  17{
  18        printk(KERN_EMERG "CPU0: Machine Check Exception.\n");
  19        add_taint(TAINT_MACHINE_CHECK);
  20}
  21
  22/* Set up machine check reporting on the Winchip C6 series */
  23void winchip_mcheck_init(struct cpuinfo_x86 *c)
  24{
  25        u32 lo, hi;
  26
  27        machine_check_vector = winchip_machine_check;
  28        /* Make sure the vector pointer is visible before we enable MCEs: */
  29        wmb();
  30
  31        rdmsr(MSR_IDT_FCR1, lo, hi);
  32        lo |= (1<<2);   /* Enable EIERRINT (int 18 MCE) */
  33        lo &= ~(1<<4);  /* Enable MCE */
  34        wrmsr(MSR_IDT_FCR1, lo, hi);
  35
  36        set_in_cr4(X86_CR4_MCE);
  37
  38        printk(KERN_INFO
  39               "Winchip machine check reporting enabled on CPU#0.\n");
  40}
  41