arch/x86/kernel/cpu/bugs.c

   1 /*
   2  *  Copyright (C) 1994  Linus Torvalds
   3  *
   4  *  Cyrix stuff, June 1998 by:
   5  *      - Rafael R. Reilova (moved everything from head.S),
   6  *        <rreilova@ececs.uc.edu>
   7  *      - Channing Corn (tests & fixes),
   8  *      - Andrew D. Balsa (code cleanup).
   9  */
  10 #include <linux/init.h>
  11 #include <linux/utsname.h>
  12 #include <asm/bugs.h>
  13 #include <asm/processor.h>
  14 #include <asm/processor-flags.h>
  15 #include <asm/fpu/internal.h>
  16 #include <asm/msr.h>
  17 #include <asm/paravirt.h>
  18 #include <asm/alternative.h>
  19
  20 void __init check_bugs(void)
  21 {
  22         identify_boot_cpu();
  23 #ifndef CONFIG_SMP
  24         pr_info("CPU: ");
  25         print_cpu_info(&boot_cpu_data);
  26 #endif
  27
  28         /*
  29          * Check whether we are able to run this kernel safely on SMP.
  30          *
  31          * - i386 is no longer supported.
  32          * - In order to run on anything without a TSC, we need to be
  33          *   compiled for a i486.
  34          */
  35         if (boot_cpu_data.x86 < 4)
  36                 panic("Kernel requires i486+ for 'invlpg' and other features");
  37
  38         init_utsname()->machine[1] =
  39                 '0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86);
  40         alternative_instructions();
  41
  42         fpu__init_check_bugs();
  43 }