1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * IDT Winchip specific Machine Check Exception Reporting
4 * (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk>
5 */
6 #include <linux/interrupt.h>
7 #include <linux/kernel.h>
8 #include <linux/types.h>
9 #include <linux/hardirq.h>
10
11 #include <asm/processor.h>
12 #include <asm/traps.h>
13 #include <asm/tlbflush.h>
14 #include <asm/mce.h>
15 #include <asm/msr.h>
16
17 #include "internal.h"
18
19 /* Machine check handler for WinChip C6: */
20 noinstr void winchip_machine_check(struct pt_regs *regs)
21 {
22 instrumentation_begin();
23 pr_emerg("CPU0: Machine Check Exception.\n");
24 add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
25 instrumentation_end();
26 }
27
28 /* Set up machine check reporting on the Winchip C6 series */
29 void winchip_mcheck_init(struct cpuinfo_x86 *c)
30 {
31 u32 lo, hi;
32
33 rdmsr(MSR_IDT_FCR1, lo, hi);
34 lo |= (1<<2); /* Enable EIERRINT (int 18 MCE) */
35 lo &= ~(1<<4); /* Enable MCE */
36 wrmsr(MSR_IDT_FCR1, lo, hi);
37
38 cr4_set_bits(X86_CR4_MCE);
39
40 pr_info("Winchip machine check reporting enabled on CPU#0.\n");
41 }
42
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