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
   9 #include <asm/processor.h>
  10 #include <asm/traps.h>
  11 #include <asm/tlbflush.h>
  12 #include <asm/mce.h>
  13 #include <asm/msr.h>
  14
  15 /* Machine check handler for WinChip C6: */
  16 static void winchip_machine_check(struct pt_regs *regs, long error_code)
  17 {
  18         enum ctx_state prev_state = ist_enter(regs);
  19
  20         printk(KERN_EMERG "CPU0: Machine Check Exception.\n");
  21         add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
  22
  23         ist_exit(regs, prev_state);
  24 }
  25
  26 /* Set up machine check reporting on the Winchip C6 series */
  27 void winchip_mcheck_init(struct cpuinfo_x86 *c)
  28 {
  29         u32 lo, hi;
  30
  31         machine_check_vector = winchip_machine_check;
  32         /* Make sure the vector pointer is visible before we enable MCEs: */
  33         wmb();
  34
  35         rdmsr(MSR_IDT_FCR1, lo, hi);
  36         lo |= (1<<2);   /* Enable EIERRINT (int 18 MCE) */
  37         lo &= ~(1<<4);  /* Enable MCE */
  38         wrmsr(MSR_IDT_FCR1, lo, hi);
  39
  40         cr4_set_bits(X86_CR4_MCE);
  41
  42         printk(KERN_INFO
  43                "Winchip machine check reporting enabled on CPU#0.\n");
  44 }