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linux-next/arch/x86/kernel/bugs_64.c
Andi Kleen f5c24a7fd0 x86: don't use large pages to map the first 2/4MB of memory
Intel recommends to not use large pages for the first 1MB
of the physical memory because there are fixed size MTRRs there
which cause splitups in the TLBs.

On AMD doing so is also a good idea.

The implementation is a little different between 32bit and 64bit.
On 32bit I just taught the initial page table set up about this
because it was very simple to do. This also has the advantage
that the risk of a prefetch ever seeing the page even
if it only exists for a short time is minimized.

On 64bit that is not quite possible, so use set_memory_4k() a little
later (in check_bugs) instead.

Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: andreas.herrmann3@amd.com
Cc: mingo@elte.hu
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-04-17 17:41:30 +02:00

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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);
}