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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * IDT Winchip specific Machine Check Exception Reporting | |
87c6fe26 | 4 | * (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 | 5 | */ |
1da177e4 | 6 | #include <linux/interrupt.h> |
91425084 IM |
7 | #include <linux/kernel.h> |
8 | #include <linux/types.h> | |
1da177e4 | 9 | |
4de81629 | 10 | #include <asm/processor.h> |
95927475 | 11 | #include <asm/traps.h> |
375074cc | 12 | #include <asm/tlbflush.h> |
9e55e44e | 13 | #include <asm/mce.h> |
1da177e4 LT |
14 | #include <asm/msr.h> |
15 | ||
91425084 | 16 | /* Machine check handler for WinChip C6: */ |
4de81629 | 17 | static void winchip_machine_check(struct pt_regs *regs, long error_code) |
1da177e4 | 18 | { |
8c84014f | 19 | ist_enter(regs); |
95927475 | 20 | |
1b74dde7 | 21 | pr_emerg("CPU0: Machine Check Exception.\n"); |
373d4d09 | 22 | add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE); |
95927475 | 23 | |
8c84014f | 24 | ist_exit(regs); |
1da177e4 LT |
25 | } |
26 | ||
27 | /* Set up machine check reporting on the Winchip C6 series */ | |
31ab269a | 28 | void winchip_mcheck_init(struct cpuinfo_x86 *c) |
1da177e4 LT |
29 | { |
30 | u32 lo, hi; | |
91425084 | 31 | |
1da177e4 | 32 | machine_check_vector = winchip_machine_check; |
91425084 | 33 | /* Make sure the vector pointer is visible before we enable MCEs: */ |
1da177e4 | 34 | wmb(); |
91425084 | 35 | |
1da177e4 | 36 | rdmsr(MSR_IDT_FCR1, lo, hi); |
4de81629 PC |
37 | lo |= (1<<2); /* Enable EIERRINT (int 18 MCE) */ |
38 | lo &= ~(1<<4); /* Enable MCE */ | |
1da177e4 | 39 | wrmsr(MSR_IDT_FCR1, lo, hi); |
91425084 | 40 | |
375074cc | 41 | cr4_set_bits(X86_CR4_MCE); |
91425084 | 42 | |
1b74dde7 | 43 | pr_info("Winchip machine check reporting enabled on CPU#0.\n"); |
1da177e4 | 44 | } |