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/mce.h>
  12 #include <asm/msr.h>
  13
  14 /* Machine check handler for WinChip C6: */
  15 static void winchip_machine_check(struct pt_regs *regs, long error_code)
  16 {
  17         printk(KERN_EMERG "CPU0: Machine Check Exception.\n");
  18         add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
  19 }
  20
  21 /* Set up machine check reporting on the Winchip C6 series */
  22 void winchip_mcheck_init(struct cpuinfo_x86 *c)
  23 {
  24         u32 lo, hi;
  25
  26         machine_check_vector = winchip_machine_check;
  27         /* Make sure the vector pointer is visible before we enable MCEs: */
  28         wmb();
  29
  30         rdmsr(MSR_IDT_FCR1, lo, hi);
  31         lo |= (1<<2);   /* Enable EIERRINT (int 18 MCE) */
  32         lo &= ~(1<<4);  /* Enable MCE */
  33         wrmsr(MSR_IDT_FCR1, lo, hi);
  34
  35         set_in_cr4(X86_CR4_MCE);
  36
  37         printk(KERN_INFO
  38                "Winchip machine check reporting enabled on CPU#0.\n");
  39 }