head32.c

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/*
 *  linux/arch/i386/kernel/head32.c -- prepare to run common code
 *
 *  Copyright (C) 2000 Andrea Arcangeli <[email protected]> SuSE
 *  Copyright (C) 2007 Eric Biederman <[email protected]>
 */

#include <linux/init.h>
#include <linux/start_kernel.h>
#include <linux/mm.h>
#include <linux/memblock.h>

#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/e820.h>
#include <asm/page.h>
#include <asm/apic.h>
#include <asm/io_apic.h>
#include <asm/bios_ebda.h>
#include <asm/tlbflush.h>

static void __init i386_default_early_setup(void)
{
    /* Initialize 32bit specific setup functions */
    x86_init.resources.reserve_resources = i386_reserve_resources;
    x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;

    reserve_ebda_region();
}

void __init i386_start_kernel(void)
{
    memblock_reserve(__pa_symbol(&_text),
             __pa_symbol(&__bss_stop) - __pa_symbol(&_text));

#ifdef CONFIG_BLK_DEV_INITRD
    /* Reserve INITRD */
    if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
        /* Assume only end is not page aligned */
        u64 ramdisk_image = boot_params.hdr.ramdisk_image;
        u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
        u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
        memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
    }
#endif

    /* Call the subarch specific early setup function */
    switch (boot_params.hdr.hardware_subarch) {
    case X86_SUBARCH_MRST:
        x86_mrst_early_setup();
        break;
    case X86_SUBARCH_CE4100:
        x86_ce4100_early_setup();
        break;
    default:
        i386_default_early_setup();
        break;
    }

    /*
     * At this point everything still needed from the boot loader
     * or BIOS or kernel text should be early reserved or marked not
     * RAM in e820. All other memory is free game.
     */

    start_kernel();
}