1 // SPDX-License-Identifier: GPL-2.0
3 * IDT Winchip specific Machine Check Exception Reporting
4 * (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk>
6 #include <linux/interrupt.h>
7 #include <linux/kernel.h>
8 #include <linux/types.h>
10 #include <asm/processor.h>
11 #include <asm/traps.h>
12 #include <asm/tlbflush.h>
16 /* Machine check handler for WinChip C6: */
17 static void winchip_machine_check(struct pt_regs *regs, long error_code)
21 pr_emerg("CPU0: Machine Check Exception.\n");
22 add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
27 /* Set up machine check reporting on the Winchip C6 series */
28 void winchip_mcheck_init(struct cpuinfo_x86 *c)
32 machine_check_vector = winchip_machine_check;
33 /* Make sure the vector pointer is visible before we enable MCEs: */
36 rdmsr(MSR_IDT_FCR1, lo, hi);
37 lo |= (1<<2); /* Enable EIERRINT (int 18 MCE) */
38 lo &= ~(1<<4); /* Enable MCE */
39 wrmsr(MSR_IDT_FCR1, lo, hi);
41 cr4_set_bits(X86_CR4_MCE);
43 pr_info("Winchip machine check reporting enabled on CPU#0.\n");