Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * P5 specific Machine Check Exception Reporting
 * (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk>
 */
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/smp.h>
#include <linux/hardirq.h>
 
#include <asm/processor.h>
#include <asm/traps.h>
#include <asm/tlbflush.h>
#include <asm/mce.h>
#include <asm/msr.h>
 
#include "internal.h"
 
/* By default disabled */
int mce_p5_enabled __read_mostly;
 
/* Machine check handler for Pentium class Intel CPUs: */
static noinstr void pentium_machine_check(struct pt_regs *regs)
{
<------>u32 loaddr, hi, lotype;
 
<------>instrumentation_begin();
<------>rdmsr(MSR_IA32_P5_MC_ADDR, loaddr, hi);
<------>rdmsr(MSR_IA32_P5_MC_TYPE, lotype, hi);
 
<------>pr_emerg("CPU#%d: Machine Check Exception:  0x%8X (type 0x%8X).\n",
<------><------> smp_processor_id(), loaddr, lotype);
 
<------>if (lotype & (1<<5)) {
<------><------>pr_emerg("CPU#%d: Possible thermal failure (CPU on fire ?).\n",
<------><------><------> smp_processor_id());
<------>}
 
<------>add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
<------>instrumentation_end();
}
 
/* Set up machine check reporting for processors with Intel style MCE: */
void intel_p5_mcheck_init(struct cpuinfo_x86 *c)
{
<------>u32 l, h;
 
<------>/* Default P5 to off as its often misconnected: */
<------>if (!mce_p5_enabled)
<------><------>return;
 
<------>/* Check for MCE support: */
<------>if (!cpu_has(c, X86_FEATURE_MCE))
<------><------>return;
 
<------>machine_check_vector = pentium_machine_check;
<------>/* Make sure the vector pointer is visible before we enable MCEs: */
<------>wmb();
 
<------>/* Read registers before enabling: */
<------>rdmsr(MSR_IA32_P5_MC_ADDR, l, h);
<------>rdmsr(MSR_IA32_P5_MC_TYPE, l, h);
<------>pr_info("Intel old style machine check architecture supported.\n");
 
<------>/* Enable MCE: */
<------>cr4_set_bits(X86_CR4_MCE);
<------>pr_info("Intel old style machine check reporting enabled on CPU#%d.\n",
<------><------>smp_processor_id());
}