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: */
16 static 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 */
23 void 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
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