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Eric W. Biederman700efc12008-02-23 09:58:20 +01001/*
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>
Yinghai Luc967da62010-03-28 19:42:55 -070010#include <linux/mm.h>
Yinghai Lu72d7c3b2010-08-25 13:39:17 -070011#include <linux/memblock.h>
Eric W. Biederman700efc12008-02-23 09:58:20 +010012
Yinghai Lua4c81cf2008-05-18 01:18:57 -070013#include <asm/setup.h>
14#include <asm/sections.h>
15#include <asm/e820.h>
Thomas Gleixner816c25e2009-08-19 14:36:27 +020016#include <asm/page.h>
Rafael J. Wysocki3e1e9002008-12-08 00:50:22 +010017#include <asm/trampoline.h>
Thomas Gleixnerde934102009-08-20 09:27:29 +020018#include <asm/apic.h>
19#include <asm/io_apic.h>
Thomas Gleixner47a3d5d2009-08-29 15:03:59 +020020#include <asm/bios_ebda.h>
Borislav Petkovb40827fa2010-08-28 15:58:33 +020021#include <asm/tlbflush.h>
Thomas Gleixner47a3d5d2009-08-29 15:03:59 +020022
23static void __init i386_default_early_setup(void)
24{
Uwe Kleine-König421f91d2010-06-11 12:17:00 +020025 /* Initialize 32bit specific setup functions */
Thomas Gleixner47a3d5d2009-08-29 15:03:59 +020026 x86_init.resources.probe_roms = probe_roms;
27 x86_init.resources.reserve_resources = i386_reserve_resources;
28 x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;
29
30 reserve_ebda_region();
31}
Yinghai Lua4c81cf2008-05-18 01:18:57 -070032
Eric W. Biederman700efc12008-02-23 09:58:20 +010033void __init i386_start_kernel(void)
34{
Yinghai Lu72d7c3b2010-08-25 13:39:17 -070035 memblock_init();
36
Yinghai Ludb8f77c2010-02-10 01:20:23 -080037#ifdef CONFIG_X86_TRAMPOLINE
38 /*
39 * But first pinch a few for the stack/trampoline stuff
40 * FIXME: Don't need the extra page at 4K, but need to fix
41 * trampoline before removing it. (see the GDT stuff)
42 */
Yinghai Lu72d7c3b2010-08-25 13:39:17 -070043 memblock_x86_reserve_range(PAGE_SIZE, PAGE_SIZE + PAGE_SIZE, "EX TRAMPOLINE");
Yinghai Ludb8f77c2010-02-10 01:20:23 -080044#endif
45
Yinghai Lua9ce6bc2010-08-25 13:39:17 -070046 memblock_x86_reserve_range(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS");
Yinghai Lua4c81cf2008-05-18 01:18:57 -070047
48#ifdef CONFIG_BLK_DEV_INITRD
49 /* Reserve INITRD */
50 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
Yinghai Luc967da62010-03-28 19:42:55 -070051 /* Assume only end is not page aligned */
Yinghai Lua4c81cf2008-05-18 01:18:57 -070052 u64 ramdisk_image = boot_params.hdr.ramdisk_image;
53 u64 ramdisk_size = boot_params.hdr.ramdisk_size;
Yinghai Luc967da62010-03-28 19:42:55 -070054 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
Yinghai Lua9ce6bc2010-08-25 13:39:17 -070055 memblock_x86_reserve_range(ramdisk_image, ramdisk_end, "RAMDISK");
Yinghai Lua4c81cf2008-05-18 01:18:57 -070056 }
57#endif
Thomas Gleixnerf7cf5a52009-08-19 14:43:56 +020058
Thomas Gleixner47a3d5d2009-08-29 15:03:59 +020059 /* Call the subarch specific early setup function */
60 switch (boot_params.hdr.hardware_subarch) {
Thomas Gleixner3f4110a2009-08-29 14:54:20 +020061 case X86_SUBARCH_MRST:
62 x86_mrst_early_setup();
63 break;
Thomas Gleixnerc751e172010-11-09 12:08:04 -080064 case X86_SUBARCH_CE4100:
65 x86_ce4100_early_setup();
66 break;
Thomas Gleixner47a3d5d2009-08-29 15:03:59 +020067 default:
68 i386_default_early_setup();
69 break;
70 }
Yinghai Lua4c81cf2008-05-18 01:18:57 -070071
72 /*
73 * At this point everything still needed from the boot loader
74 * or BIOS or kernel text should be early reserved or marked not
75 * RAM in e820. All other memory is free game.
76 */
77
Eric W. Biederman700efc12008-02-23 09:58:20 +010078 start_kernel();
79}