text: /*
   * 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 <asm/processor.h>
  #include <asm/traps.h>
  #include <asm/tlbflush.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)
  {
  	enum ctx_state prev_state = ist_enter(regs);
  
  	printk(KERN_EMERG "CPU0: Machine Check Exception.\n");
  	add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
  
  	ist_exit(regs, prev_state);
  }
  
  /* 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);
  
  	printk(KERN_INFO
  	       "Winchip machine check reporting enabled on CPU#0.\n");
  }
  