arch/x86/kernel/cpu/bugs_64.c

   1 /*
   2  *  Copyright (C) 1994  Linus Torvalds
   3  *  Copyright (C) 2000  SuSE
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/init.h>
   8 #include <asm/alternative.h>
   9 #include <asm/bugs.h>
  10 #include <asm/processor.h>
  11 #include <asm/mtrr.h>
  12 #include <asm/cacheflush.h>
  13
  14 void __init check_bugs(void)
  15 {
  16         identify_boot_cpu();
  17 #if !defined(CONFIG_SMP)
  18         printk(KERN_INFO "CPU: ");
  19         print_cpu_info(&boot_cpu_data);
  20 #endif
  21         alternative_instructions();
  22
  23         /*
  24          * Make sure the first 2MB area is not mapped by huge pages
  25          * There are typically fixed size MTRRs in there and overlapping
  26          * MTRRs into large pages causes slow downs.
  27          *
  28          * Right now we don't do that with gbpages because there seems
  29          * very little benefit for that case.
  30          */
  31         if (!direct_gbpages)
  32                 set_memory_4k((unsigned long)__va(0), 1);
  33 }