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: */
16static 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 */
27void 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}
45