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
  11 #include <asm/setup.h>
  12 #include <asm/sections.h>
  13 #include <asm/e820.h>
  14 #include <asm/bios_ebda.h>
  15
  16 void __init i386_start_kernel(void)
  17 {
  18         reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS");
  19
  20 #ifdef CONFIG_BLK_DEV_INITRD
  21         /* Reserve INITRD */
  22         if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
  23                 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
  24                 u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
  25                 u64 ramdisk_end   = ramdisk_image + ramdisk_size;
  26                 reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
  27         }
  28 #endif
  29         reserve_early(init_pg_tables_start, init_pg_tables_end,
  30                         "INIT_PG_TABLE");
  31
  32         reserve_ebda_region();
  33
  34         /*
  35          * At this point everything still needed from the boot loader
  36          * or BIOS or kernel text should be early reserved or marked not
  37          * RAM in e820. All other memory is free game.
  38          */
  39
  40         start_kernel();
  41 }