2 * linux/arch/i386/kernel/head32.c -- prepare to run common code
4 * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
5 * Copyright (C) 2007 Eric Biederman <ebiederm@xmission.com>
8 #include <linux/init.h>
9 #include <linux/start_kernel.h>
12 #include <asm/setup.h>
13 #include <asm/sections.h>
16 #include <asm/trampoline.h>
18 #include <asm/io_apic.h>
19 #include <asm/bios_ebda.h>
20 #include <asm/tlbflush.h>
22 static void __init i386_default_early_setup(void)
24 /* Initialize 32bit specific setup functions */
25 x86_init.resources.probe_roms = probe_roms;
26 x86_init.resources.reserve_resources = i386_reserve_resources;
27 x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;
29 reserve_ebda_region();
32 void __init i386_start_kernel(void)
34 #ifdef CONFIG_X86_TRAMPOLINE
36 * But first pinch a few for the stack/trampoline stuff
37 * FIXME: Don't need the extra page at 4K, but need to fix
38 * trampoline before removing it. (see the GDT stuff)
40 reserve_early_overlap_ok(PAGE_SIZE, PAGE_SIZE + PAGE_SIZE,
44 reserve_early(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS");
46 #ifdef CONFIG_BLK_DEV_INITRD
48 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
49 /* Assume only end is not page aligned */
50 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
51 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
52 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
53 reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
57 /* Call the subarch specific early setup function */
58 switch (boot_params.hdr.hardware_subarch) {
59 case X86_SUBARCH_MRST:
60 x86_mrst_early_setup();
63 i386_default_early_setup();
68 * At this point everything still needed from the boot loader
69 * or BIOS or kernel text should be early reserved or marked not
70 * RAM in e820. All other memory is free game.