arch/x86/kernel/head32.c

   1 /*
   2  *  linux/arch/i386/kernel/head32.c -- prepare to run common code
   3  *
   4  *  Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
   5  *  Copyright (C) 2007 Eric Biederman <ebiederm@xmission.com>
   6  */
   7
   8 #include <linux/init.h>
   9 #include <linux/start_kernel.h>
  10 #include <linux/mm.h>
  11 #include <linux/memblock.h>
  12
  13 #include <asm/setup.h>
  14 #include <asm/sections.h>
  15 #include <asm/e820.h>
  16 #include <asm/page.h>
  17 #include <asm/apic.h>
  18 #include <asm/io_apic.h>
  19 #include <asm/bios_ebda.h>
  20 #include <asm/tlbflush.h>
  21 #include <asm/bootparam_utils.h>
  22
  23 static void __init i386_default_early_setup(void)
  24 {
  25         /* Initialize 32bit specific setup functions */
  26         x86_init.resources.reserve_resources = i386_reserve_resources;
  27         x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;
  28
  29         reserve_ebda_region();
  30 }
  31
  32 asmlinkage __visible void __init i386_start_kernel(void)
  33 {
  34         cr4_init_shadow();
  35         sanitize_boot_params(&boot_params);
  36
  37         /* Call the subarch specific early setup function */
  38         switch (boot_params.hdr.hardware_subarch) {
  39         case X86_SUBARCH_INTEL_MID:
  40                 x86_intel_mid_early_setup();
  41                 break;
  42         case X86_SUBARCH_CE4100:
  43                 x86_ce4100_early_setup();
  44                 break;
  45         default:
  46                 i386_default_early_setup();
  47                 break;
  48         }
  49
  50         start_kernel();
  51 }