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: */
winchip_machine_check(struct pt_regs * regs,long error_code)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);
19 }
20 
21 /* Set up machine check reporting on the Winchip C6 series */
winchip_mcheck_init(struct cpuinfo_x86 * c)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 }
40