original_kernel/arch/x86/kernel/cpu/bugs_64.c

/*
 *  Copyright (C) 1994  Linus Torvalds
 *  Copyright (C) 2000  SuSE
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/alternative.h>
#include <asm/bugs.h>
#include <asm/processor.h>
#include <asm/mtrr.h>
#include <asm/cacheflush.h>

void __init check_bugs(void)
{
	identify_boot_cpu();
#if !defined(CONFIG_SMP)
	printk("CPU: ");
	print_cpu_info(&boot_cpu_data);
#endif
	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);
}