Release 4.14 arch/x86/kernel/cpu/bugs.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  Copyright (C) 1994  Linus Torvalds
 *
 *  Cyrix stuff, June 1998 by:
 *      - Rafael R. Reilova (moved everything from head.S),
 *        <rreilova@ececs.uc.edu>
 *      - Channing Corn (tests & fixes),
 *      - Andrew D. Balsa (code cleanup).
 */
#include <linux/init.h>
#include <linux/utsname.h>
#include <asm/bugs.h>
#include <asm/processor.h>
#include <asm/processor-flags.h>
#include <asm/fpu/internal.h>
#include <asm/msr.h>
#include <asm/paravirt.h>
#include <asm/alternative.h>
#include <asm/pgtable.h>
#include <asm/set_memory.h>



void __init check_bugs(void)
{
	identify_boot_cpu();

	if (!IS_ENABLED(CONFIG_SMP)) {
		pr_info("CPU: ");
		print_cpu_info(&boot_cpu_data);
	}

#ifdef CONFIG_X86_32
	/*
         * Check whether we are able to run this kernel safely on SMP.
         *
         * - i386 is no longer supported.
         * - In order to run on anything without a TSC, we need to be
         *   compiled for a i486.
         */
	if (boot_cpu_data.x86 < 4)
		panic("Kernel requires i486+ for 'invlpg' and other features");

	init_utsname()->machine[1] =
		'0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86);
	alternative_instructions();

	fpu__init_check_bugs();
#else /* CONFIG_X86_64 */
	alternative_instructions();

	/*
         * Make sure the first 2MB area is not mapped by huge pages
         * There are typically fixed size MTRRs in there and overlapping
         * MTRRs into large pages causes slow downs.
         *
         * Right now we don't do that with gbpages because there seems
         * very little benefit for that case.
         */
	if (!direct_gbpages)
		set_memory_4k((unsigned long)__va(0), 1);
#endif
}
Contributors
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Borislav Petkov
53
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2
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Jeremy Fitzhardinge
50
46.73%
1
16.67%
Suresh B. Siddha
2
1.87%
1
16.67%
Ingo Molnar
1
0.93%
1
16.67%
Joe Perches
1
0.93%
1
16.67%
Total
107
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6
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Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Jeremy Fitzhardinge
70
49.30%
1
8.33%
Borislav Petkov
58
40.85%
2
16.67%
Dave Jones
4
2.82%
2
16.67%
Josh Triplett
3
2.11%
1
8.33%
Ingo Molnar
2
1.41%
2
16.67%
Suresh B. Siddha
2
1.41%
1
8.33%
Laura Abbott
1
0.70%
1
8.33%
Greg Kroah-Hartman
1
0.70%
1
8.33%
Joe Perches
1
0.70%
1
8.33%
Total
142
100.00%
12
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Directory: arch/x86/kernel/cpu

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