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: */
winchip_machine_check(struct pt_regs * regs,long error_code)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 */
winchip_mcheck_init(struct cpuinfo_x86 * c)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