[linux-block.git] / arch / i386 / kernel / setup.c

/*
 *  linux/arch/i386/kernel/setup.c
 *
 *  Copyright (C) 1995  Linus Torvalds
 *
 *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
 *
 *  Memory region support
 *	David Parsons <orc@pell.chi.il.us>, July-August 1999
 *
 *  Added E820 sanitization routine (removes overlapping memory regions);
 *  Brian Moyle <bmoyle@mvista.com>, February 2001
 *
 * Moved CPU detection code to cpu/${cpu}.c
 *    Patrick Mochel <mochel@osdl.org>, March 2002
 *
 *  Provisions for empty E820 memory regions (reported by certain BIOSes).
 *  Alex Achenbach <xela@slit.de>, December 2002.
 *
 */

/*
 * This file handles the architecture-dependent parts of initialization
 */

#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/screen_info.h>
#include <linux/ioport.h>
#include <linux/acpi.h>
#include <linux/apm_bios.h>
#include <linux/initrd.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/console.h>
#include <linux/mca.h>
#include <linux/root_dev.h>
#include <linux/highmem.h>
#include <linux/module.h>
#include <linux/efi.h>
#include <linux/init.h>
#include <linux/edd.h>
#include <linux/nodemask.h>
#include <linux/kexec.h>
#include <linux/crash_dump.h>
#include <linux/dmi.h>
#include <linux/pfn.h>

#include <video/edid.h>

#include <asm/apic.h>
#include <asm/e820.h>
#include <asm/mpspec.h>
#include <asm/mmzone.h>
#include <asm/setup.h>
#include <asm/arch_hooks.h>
#include <asm/sections.h>
#include <asm/io_apic.h>
#include <asm/ist.h>
#include <asm/io.h>
#include <asm/vmi.h>
#include <setup_arch.h>
#include <bios_ebda.h>

/* This value is set up by the early boot code to point to the value
   immediately after the boot time page tables.  It contains a *physical*
   address, and must not be in the .bss segment! */
unsigned long init_pg_tables_end __initdata = ~0UL;

int disable_pse __devinitdata = 0;

/*
 * Machine setup..
 */
extern struct resource code_resource;
extern struct resource data_resource;

/* cpu data as detected by the assembly code in head.S */
struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
/* common cpu data for all cpus */
struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
EXPORT_SYMBOL(boot_cpu_data);

unsigned long mmu_cr4_features;

/* for MCA, but anyone else can use it if they want */
unsigned int machine_id;
#ifdef CONFIG_MCA
EXPORT_SYMBOL(machine_id);
#endif
unsigned int machine_submodel_id;
unsigned int BIOS_revision;
unsigned int mca_pentium_flag;

/* Boot loader ID as an integer, for the benefit of proc_dointvec */
int bootloader_type;

/* user-defined highmem size */
static unsigned int highmem_pages = -1;

/*
 * Setup options
 */
struct screen_info screen_info;
EXPORT_SYMBOL(screen_info);
struct apm_info apm_info;
EXPORT_SYMBOL(apm_info);
struct edid_info edid_info;
EXPORT_SYMBOL_GPL(edid_info);
struct ist_info ist_info;
#if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
	defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
EXPORT_SYMBOL(ist_info);
#endif

extern void early_cpu_init(void);
extern int root_mountflags;

unsigned long saved_videomode;

#define RAMDISK_IMAGE_START_MASK  	0x07FF
#define RAMDISK_PROMPT_FLAG		0x8000
#define RAMDISK_LOAD_FLAG		0x4000	

static char __initdata command_line[COMMAND_LINE_SIZE];

struct boot_params __initdata boot_params;

#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
struct edd edd;
#ifdef CONFIG_EDD_MODULE
EXPORT_SYMBOL(edd);
#endif
/**
 * copy_edd() - Copy the BIOS EDD information
 *              from boot_params into a safe place.
 *
 */
static inline void copy_edd(void)
{
     memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
     memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
     edd.mbr_signature_nr = EDD_MBR_SIG_NR;
     edd.edd_info_nr = EDD_NR;
}
#else
static inline void copy_edd(void)
{
}
#endif

int __initdata user_defined_memmap = 0;

/*
 * "mem=nopentium" disables the 4MB page tables.
 * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
 * to <mem>, overriding the bios size.
 * "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
 * <start> to <start>+<mem>, overriding the bios size.
 *
 * HPA tells me bootloaders need to parse mem=, so no new
 * option should be mem=  [also see Documentation/i386/boot.txt]
 */
static int __init parse_mem(char *arg)
{
	if (!arg)
		return -EINVAL;

	if (strcmp(arg, "nopentium") == 0) {
		clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
		disable_pse = 1;
	} else {
		/* If the user specifies memory size, we
		 * limit the BIOS-provided memory map to
		 * that size. exactmap can be used to specify
		 * the exact map. mem=number can be used to
		 * trim the existing memory map.
		 */
		unsigned long long mem_size;
 
		mem_size = memparse(arg, &arg);
		limit_regions(mem_size);
		user_defined_memmap = 1;
	}
	return 0;
}
early_param("mem", parse_mem);

#ifdef CONFIG_PROC_VMCORE
/* elfcorehdr= specifies the location of elf core header
 * stored by the crashed kernel.
 */
static int __init parse_elfcorehdr(char *arg)
{
	if (!arg)
		return -EINVAL;

	elfcorehdr_addr = memparse(arg, &arg);
	return 0;
}
early_param("elfcorehdr", parse_elfcorehdr);
#endif /* CONFIG_PROC_VMCORE */

/*
 * highmem=size forces highmem to be exactly 'size' bytes.
 * This works even on boxes that have no highmem otherwise.
 * This also works to reduce highmem size on bigger boxes.
 */
static int __init parse_highmem(char *arg)
{
	if (!arg)
		return -EINVAL;

	highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
	return 0;
}
early_param("highmem", parse_highmem);

/*
 * vmalloc=size forces the vmalloc area to be exactly 'size'
 * bytes. This can be used to increase (or decrease) the
 * vmalloc area - the default is 128m.
 */
static int __init parse_vmalloc(char *arg)
{
	if (!arg)
		return -EINVAL;

	__VMALLOC_RESERVE = memparse(arg, &arg);
	return 0;
}
early_param("vmalloc", parse_vmalloc);

/*
 * reservetop=size reserves a hole at the top of the kernel address space which
 * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 * so relocating the fixmap can be done before paging initialization.
 */
static int __init parse_reservetop(char *arg)
{
	unsigned long address;

	if (!arg)
		return -EINVAL;

	address = memparse(arg, &arg);
	reserve_top_address(address);
	return 0;
}
early_param("reservetop", parse_reservetop);

/*
 * Determine low and high memory ranges:
 */
unsigned long __init find_max_low_pfn(void)
{
	unsigned long max_low_pfn;

	max_low_pfn = max_pfn;
	if (max_low_pfn > MAXMEM_PFN) {
		if (highmem_pages == -1)
			highmem_pages = max_pfn - MAXMEM_PFN;
		if (highmem_pages + MAXMEM_PFN < max_pfn)
			max_pfn = MAXMEM_PFN + highmem_pages;
		if (highmem_pages + MAXMEM_PFN > max_pfn) {
			printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
			highmem_pages = 0;
		}
		max_low_pfn = MAXMEM_PFN;
#ifndef CONFIG_HIGHMEM
		/* Maximum memory usable is what is directly addressable */
		printk(KERN_WARNING "Warning only %ldMB will be used.\n",
					MAXMEM>>20);
		if (max_pfn > MAX_NONPAE_PFN)
			printk(KERN_WARNING "Use a PAE enabled kernel.\n");
		else
			printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
		max_pfn = MAXMEM_PFN;
#else /* !CONFIG_HIGHMEM */
#ifndef CONFIG_X86_PAE
		if (max_pfn > MAX_NONPAE_PFN) {
			max_pfn = MAX_NONPAE_PFN;
			printk(KERN_WARNING "Warning only 4GB will be used.\n");
			printk(KERN_WARNING "Use a PAE enabled kernel.\n");
		}
#endif /* !CONFIG_X86_PAE */
#endif /* !CONFIG_HIGHMEM */
	} else {
		if (highmem_pages == -1)
			highmem_pages = 0;
#ifdef CONFIG_HIGHMEM
		if (highmem_pages >= max_pfn) {
			printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
			highmem_pages = 0;
		}
		if (highmem_pages) {
			if (max_low_pfn-highmem_pages < 64*1024*1024/PAGE_SIZE){
				printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
				highmem_pages = 0;
			}
			max_low_pfn -= highmem_pages;
		}
#else
		if (highmem_pages)
			printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
#endif
	}
	return max_low_pfn;
}

/*
 * workaround for Dell systems that neglect to reserve EBDA
 */
static void __init reserve_ebda_region(void)
{
	unsigned int addr;
	addr = get_bios_ebda();
	if (addr)
		reserve_bootmem(addr, PAGE_SIZE);	
}

#ifndef CONFIG_NEED_MULTIPLE_NODES
void __init setup_bootmem_allocator(void);
static unsigned long __init setup_memory(void)
{
	/*
	 * partially used pages are not usable - thus
	 * we are rounding upwards:
	 */
	min_low_pfn = PFN_UP(init_pg_tables_end);

	find_max_pfn();

	max_low_pfn = find_max_low_pfn();

#ifdef CONFIG_HIGHMEM
	highstart_pfn = highend_pfn = max_pfn;
	if (max_pfn > max_low_pfn) {
		highstart_pfn = max_low_pfn;
	}
	printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
		pages_to_mb(highend_pfn - highstart_pfn));
	num_physpages = highend_pfn;
	high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
#else
	num_physpages = max_low_pfn;
	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
#endif
#ifdef CONFIG_FLATMEM
	max_mapnr = num_physpages;
#endif
	printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
			pages_to_mb(max_low_pfn));

	setup_bootmem_allocator();

	return max_low_pfn;
}

void __init zone_sizes_init(void)
{
	unsigned long max_zone_pfns[MAX_NR_ZONES];
	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
	max_zone_pfns[ZONE_DMA] =
		virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
#ifdef CONFIG_HIGHMEM
	max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
	add_active_range(0, 0, highend_pfn);
#else
	add_active_range(0, 0, max_low_pfn);
#endif

	free_area_init_nodes(max_zone_pfns);
}
#else
extern unsigned long __init setup_memory(void);
extern void zone_sizes_init(void);
#endif /* !CONFIG_NEED_MULTIPLE_NODES */

void __init setup_bootmem_allocator(void)
{
	unsigned long bootmap_size;
	/*
	 * Initialize the boot-time allocator (with low memory only):
	 */
	bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);

	register_bootmem_low_pages(max_low_pfn);

	/*
	 * Reserve the bootmem bitmap itself as well. We do this in two
	 * steps (first step was init_bootmem()) because this catches
	 * the (very unlikely) case of us accidentally initializing the
	 * bootmem allocator with an invalid RAM area.
	 */
	reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
			 bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));

	/*
	 * reserve physical page 0 - it's a special BIOS page on many boxes,
	 * enabling clean reboots, SMP operation, laptop functions.
	 */
	reserve_bootmem(0, PAGE_SIZE);

	/* reserve EBDA region, it's a 4K region */
	reserve_ebda_region();

    /* could be an AMD 768MPX chipset. Reserve a page  before VGA to prevent
       PCI prefetch into it (errata #56). Usually the page is reserved anyways,
       unless you have no PS/2 mouse plugged in. */
	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
	    boot_cpu_data.x86 == 6)
	     reserve_bootmem(0xa0000 - 4096, 4096);

#ifdef CONFIG_SMP
	/*
	 * But first pinch a few for the stack/trampoline stuff
	 * FIXME: Don't need the extra page at 4K, but need to fix
	 * trampoline before removing it. (see the GDT stuff)
	 */
	reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
#endif
#ifdef CONFIG_ACPI_SLEEP
	/*
	 * Reserve low memory region for sleep support.
	 */
	acpi_reserve_bootmem();
#endif
#ifdef CONFIG_X86_FIND_SMP_CONFIG
	/*
	 * Find and reserve possible boot-time SMP configuration:
	 */
	find_smp_config();
#endif
	numa_kva_reserve();
#ifdef CONFIG_BLK_DEV_INITRD
	if (LOADER_TYPE && INITRD_START) {
		if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
			reserve_bootmem(INITRD_START, INITRD_SIZE);
			initrd_start = INITRD_START + PAGE_OFFSET;
			initrd_end = initrd_start+INITRD_SIZE;
		}
		else {
			printk(KERN_ERR "initrd extends beyond end of memory "
			    "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
			    INITRD_START + INITRD_SIZE,
			    max_low_pfn << PAGE_SHIFT);
			initrd_start = 0;
		}
	}
#endif
#ifdef CONFIG_KEXEC
	if (crashk_res.start != crashk_res.end)
		reserve_bootmem(crashk_res.start,
			crashk_res.end - crashk_res.start + 1);
#endif
}

/*
 * The node 0 pgdat is initialized before all of these because
 * it's needed for bootmem.  node>0 pgdats have their virtual
 * space allocated before the pagetables are in place to access
 * them, so they can't be cleared then.
 *
 * This should all compile down to nothing when NUMA is off.
 */
void __init remapped_pgdat_init(void)
{
	int nid;

	for_each_online_node(nid) {
		if (nid != 0)
			memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
	}
}

#ifdef CONFIG_MCA
static void set_mca_bus(int x)
{
	MCA_bus = x;
}
#else
static void set_mca_bus(int x) { }
#endif

/* Overridden in paravirt.c if CONFIG_PARAVIRT */
char * __init __attribute__((weak)) memory_setup(void)
{
	return machine_specific_memory_setup();
}

/*
 * Determine if we were loaded by an EFI loader.  If so, then we have also been
 * passed the efi memmap, systab, etc., so we should use these data structures
 * for initialization.  Note, the efi init code path is determined by the
 * global efi_enabled. This allows the same kernel image to be used on existing
 * systems (with a traditional BIOS) as well as on EFI systems.
 */
void __init setup_arch(char **cmdline_p)
{
	unsigned long max_low_pfn;

	memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
	pre_setup_arch_hook();
	early_cpu_init();

	/*
	 * FIXME: This isn't an official loader_type right
	 * now but does currently work with elilo.
	 * If we were configured as an EFI kernel, check to make
	 * sure that we were loaded correctly from elilo and that
	 * the system table is valid.  If not, then initialize normally.
	 */
#ifdef CONFIG_EFI
	if ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
		efi_enabled = 1;
#endif

 	ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 	screen_info = SCREEN_INFO;
	edid_info = EDID_INFO;
	apm_info.bios = APM_BIOS_INFO;
	ist_info = IST_INFO;
	saved_videomode = VIDEO_MODE;
	if( SYS_DESC_TABLE.length != 0 ) {
		set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2);
		machine_id = SYS_DESC_TABLE.table[0];
		machine_submodel_id = SYS_DESC_TABLE.table[1];
		BIOS_revision = SYS_DESC_TABLE.table[2];
	}
	bootloader_type = LOADER_TYPE;

#ifdef CONFIG_BLK_DEV_RAM
	rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
	rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
	rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
#endif
	ARCH_SETUP
	if (efi_enabled)
		efi_init();
	else {
		printk(KERN_INFO "BIOS-provided physical RAM map:\n");
		print_memory_map(memory_setup());
	}

	copy_edd();

	if (!MOUNT_ROOT_RDONLY)
		root_mountflags &= ~MS_RDONLY;
	init_mm.start_code = (unsigned long) _text;
	init_mm.end_code = (unsigned long) _etext;
	init_mm.end_data = (unsigned long) _edata;
	init_mm.brk = init_pg_tables_end + PAGE_OFFSET;

	code_resource.start = virt_to_phys(_text);
	code_resource.end = virt_to_phys(_etext)-1;
	data_resource.start = virt_to_phys(_etext);
	data_resource.end = virt_to_phys(_edata)-1;

	parse_early_param();

	if (user_defined_memmap) {
		printk(KERN_INFO "user-defined physical RAM map:\n");
		print_memory_map("user");
	}

	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
	*cmdline_p = command_line;

	max_low_pfn = setup_memory();

#ifdef CONFIG_VMI
	/*
	 * Must be after max_low_pfn is determined, and before kernel
	 * pagetables are setup.
	 */
	vmi_init();
#endif

	/*
	 * NOTE: before this point _nobody_ is allowed to allocate
	 * any memory using the bootmem allocator.  Although the
	 * alloctor is now initialised only the first 8Mb of the kernel
	 * virtual address space has been mapped.  All allocations before
	 * paging_init() has completed must use the alloc_bootmem_low_pages()
	 * variant (which allocates DMA'able memory) and care must be taken
	 * not to exceed the 8Mb limit.
	 */

#ifdef CONFIG_SMP
	smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
#endif
	paging_init();
	remapped_pgdat_init();
	sparse_init();
	zone_sizes_init();

	/*
	 * NOTE: at this point the bootmem allocator is fully available.
	 */

	paravirt_post_allocator_init();

	dmi_scan_machine();

#ifdef CONFIG_X86_GENERICARCH
	generic_apic_probe();
#endif	
	if (efi_enabled)
		efi_map_memmap();

#ifdef CONFIG_ACPI
	/*
	 * Parse the ACPI tables for possible boot-time SMP configuration.
	 */
	acpi_boot_table_init();
#endif

#ifdef CONFIG_PCI
#ifdef CONFIG_X86_IO_APIC
	check_acpi_pci();	/* Checks more than just ACPI actually */
#endif
#endif

#ifdef CONFIG_ACPI
	acpi_boot_init();

#if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
	if (def_to_bigsmp)
		printk(KERN_WARNING "More than 8 CPUs detected and "
			"CONFIG_X86_PC cannot handle it.\nUse "
			"CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
#endif
#endif
#ifdef CONFIG_X86_LOCAL_APIC
	if (smp_found_config)
		get_smp_config();
#endif

	e820_register_memory();

#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
	if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
		conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif
#endif
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/i386/kernel/setup.c
	3	*
	4	* Copyright (C) 1995 Linus Torvalds
	5	*
	6	* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
	7	*
	8	* Memory region support
	9	* David Parsons <orc@pell.chi.il.us>, July-August 1999
	10	*
	11	* Added E820 sanitization routine (removes overlapping memory regions);
	12	* Brian Moyle <bmoyle@mvista.com>, February 2001
	13	*
	14	* Moved CPU detection code to cpu/${cpu}.c
	15	* Patrick Mochel <mochel@osdl.org>, March 2002
	16	*
	17	* Provisions for empty E820 memory regions (reported by certain BIOSes).
	18	* Alex Achenbach <xela@slit.de>, December 2002.
	19	*
	20	*/
	21
	22	/*
	23	* This file handles the architecture-dependent parts of initialization
	24	*/
	25
	26	#include <linux/sched.h>
	27	#include <linux/mm.h>
05b79bdc	28	#include <linux/mmzone.h>
894673ee	29	#include <linux/screen_info.h>
1da177e4 LT	30	#include <linux/ioport.h>
	31	#include <linux/acpi.h>
	32	#include <linux/apm_bios.h>
	33	#include <linux/initrd.h>
	34	#include <linux/bootmem.h>
	35	#include <linux/seq_file.h>
	36	#include <linux/console.h>
	37	#include <linux/mca.h>
	38	#include <linux/root_dev.h>
	39	#include <linux/highmem.h>
	40	#include <linux/module.h>
	41	#include <linux/efi.h>
	42	#include <linux/init.h>
	43	#include <linux/edd.h>
	44	#include <linux/nodemask.h>
1bc3b91a	45	#include <linux/kexec.h>
2030eae5	46	#include <linux/crash_dump.h>
e9928674	47	#include <linux/dmi.h>
22a9835c	48	#include <linux/pfn.h>
1bc3b91a	49
1da177e4	50	#include <video/edid.h>
1bc3b91a	51
9635b47d	52	#include <asm/apic.h>
1da177e4 LT	53	#include <asm/e820.h>
1da177e4 LT	54	#include <asm/mpspec.h>
91023300	55	#include <asm/mmzone.h>
1da177e4 LT	56	#include <asm/setup.h>
	57	#include <asm/arch_hooks.h>
	58	#include <asm/sections.h>
	59	#include <asm/io_apic.h>
	60	#include <asm/ist.h>
	61	#include <asm/io.h>
7ce0bcfd	62	#include <asm/vmi.h>
e75eac33	63	#include <setup_arch.h>
1da177e4 LT	64	#include <bios_ebda.h>
	65
	66	/* This value is set up by the early boot code to point to the value
	67	immediately after the boot time page tables. It contains a physical
	68	address, and must not be in the .bss segment! */
	69	unsigned long init_pg_tables_end __initdata = ~0UL;
	70
0bb3184d	71	int disable_pse __devinitdata = 0;
1da177e4 LT	72
	73	/*
	74	* Machine setup..
	75	*/
269c2d81	76	extern struct resource code_resource;
269c2d81	77	extern struct resource data_resource;
1da177e4 LT	78
1da177e4 LT	79	/* cpu data as detected by the assembly code in head.S */
4a5d107a	80	struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
1da177e4	81	/* common cpu data for all cpus */
c3d8c141	82	struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
129f6946	83	EXPORT_SYMBOL(boot_cpu_data);
1da177e4 LT	84
	85	unsigned long mmu_cr4_features;
	86
1da177e4 LT	87	/* for MCA, but anyone else can use it if they want */
1da177e4 LT	88	unsigned int machine_id;
129f6946 AD	89	#ifdef CONFIG_MCA
	90	EXPORT_SYMBOL(machine_id);
	91	#endif
1da177e4 LT	92	unsigned int machine_submodel_id;
	93	unsigned int BIOS_revision;
	94	unsigned int mca_pentium_flag;
	95
1da177e4 LT	96	/* Boot loader ID as an integer, for the benefit of proc_dointvec */
	97	int bootloader_type;
	98
	99	/* user-defined highmem size */
	100	static unsigned int highmem_pages = -1;
	101
	102	/*
	103	* Setup options
	104	*/
1da177e4	105	struct screen_info screen_info;
129f6946	106	EXPORT_SYMBOL(screen_info);
1da177e4	107	struct apm_info apm_info;
129f6946	108	EXPORT_SYMBOL(apm_info);
1da177e4	109	struct edid_info edid_info;
5e518d76	110	EXPORT_SYMBOL_GPL(edid_info);
1da177e4	111	struct ist_info ist_info;
129f6946 AD	112	#if defined(CONFIG_X86_SPEEDSTEP_SMI) \|\| \
	113	defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
	114	EXPORT_SYMBOL(ist_info);
	115	#endif
1da177e4 LT	116
1da177e4 LT	117	extern void early_cpu_init(void);
1da177e4 LT	118	extern int root_mountflags;
	119
	120	unsigned long saved_videomode;
	121
	122	#define RAMDISK_IMAGE_START_MASK 0x07FF
	123	#define RAMDISK_PROMPT_FLAG 0x8000
	124	#define RAMDISK_LOAD_FLAG 0x4000
	125
4e498b66	126	static char __initdata command_line[COMMAND_LINE_SIZE];
1da177e4	127
48c7ae67	128	struct boot_params __initdata boot_params;
1da177e4	129
1da177e4 LT	130	#if defined(CONFIG_EDD) \|\| defined(CONFIG_EDD_MODULE)
	131	struct edd edd;
	132	#ifdef CONFIG_EDD_MODULE
	133	EXPORT_SYMBOL(edd);
	134	#endif
	135	/**
	136	* copy_edd() - Copy the BIOS EDD information
	137	* from boot_params into a safe place.
	138	*
	139	*/
	140	static inline void copy_edd(void)
	141	{
	142	memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
	143	memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
	144	edd.mbr_signature_nr = EDD_MBR_SIG_NR;
	145	edd.edd_info_nr = EDD_NR;
	146	}
	147	#else
	148	static inline void copy_edd(void)
	149	{
	150	}
	151	#endif
	152
cef518e8	153	int __initdata user_defined_memmap = 0;
1da177e4	154
1a3f239d RR	155	/*
	156	* "mem=nopentium" disables the 4MB page tables.
	157	* "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
	158	* to <mem>, overriding the bios size.
	159	* "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
	160	* <start> to <start>+<mem>, overriding the bios size.
	161	*
	162	* HPA tells me bootloaders need to parse mem=, so no new
	163	* option should be mem= [also see Documentation/i386/boot.txt]
	164	*/
	165	static int __init parse_mem(char *arg)
	166	{
	167	if (!arg)
	168	return -EINVAL;
1da177e4	169
1a3f239d RR	170	if (strcmp(arg, "nopentium") == 0) {
	171	clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
	172	disable_pse = 1;
	173	} else {
	174	/* If the user specifies memory size, we
	175	* limit the BIOS-provided memory map to
	176	* that size. exactmap can be used to specify
	177	* the exact map. mem=number can be used to
	178	* trim the existing memory map.
1da177e4	179	*/
1a3f239d	180	unsigned long long mem_size;
1da177e4	181
1a3f239d RR	182	mem_size = memparse(arg, &arg);
	183	limit_regions(mem_size);
	184	user_defined_memmap = 1;
	185	}
	186	return 0;
	187	}
	188	early_param("mem", parse_mem);
1da177e4	189
1a3f239d RR	190	#ifdef CONFIG_PROC_VMCORE
	191	/* elfcorehdr= specifies the location of elf core header
	192	* stored by the crashed kernel.
	193	*/
	194	static int __init parse_elfcorehdr(char *arg)
	195	{
	196	if (!arg)
	197	return -EINVAL;
66759a01	198
1a3f239d RR	199	elfcorehdr_addr = memparse(arg, &arg);
	200	return 0;
	201	}
	202	early_param("elfcorehdr", parse_elfcorehdr);
	203	#endif /* CONFIG_PROC_VMCORE */
1da177e4	204
1a3f239d RR	205	/*
	206	* highmem=size forces highmem to be exactly 'size' bytes.
	207	* This works even on boxes that have no highmem otherwise.
	208	* This also works to reduce highmem size on bigger boxes.
	209	*/
	210	static int __init parse_highmem(char *arg)
	211	{
	212	if (!arg)
	213	return -EINVAL;
9635b47d	214
1a3f239d RR	215	highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
	216	return 0;
	217	}
	218	early_param("highmem", parse_highmem);
9635b47d	219
1a3f239d RR	220	/*
	221	* vmalloc=size forces the vmalloc area to be exactly 'size'
	222	* bytes. This can be used to increase (or decrease) the
	223	* vmalloc area - the default is 128m.
	224	*/
	225	static int __init parse_vmalloc(char *arg)
	226	{
	227	if (!arg)
	228	return -EINVAL;
1bc3b91a	229
1a3f239d RR	230	__VMALLOC_RESERVE = memparse(arg, &arg);
1a3f239d RR	231	return 0;
1da177e4	232	}
1a3f239d	233	early_param("vmalloc", parse_vmalloc);
1da177e4	234
461a9aff ZA	235	/*
	236	* reservetop=size reserves a hole at the top of the kernel address space which
	237	* a hypervisor can load into later. Needed for dynamically loaded hypervisors,
	238	* so relocating the fixmap can be done before paging initialization.
	239	*/
	240	static int __init parse_reservetop(char *arg)
	241	{
	242	unsigned long address;
	243
	244	if (!arg)
	245	return -EINVAL;
	246
	247	address = memparse(arg, &arg);
	248	reserve_top_address(address);
	249	return 0;
	250	}
	251	early_param("reservetop", parse_reservetop);
	252
1da177e4 LT	253	/*
	254	* Determine low and high memory ranges:
	255	*/
	256	unsigned long __init find_max_low_pfn(void)
	257	{
	258	unsigned long max_low_pfn;
	259
	260	max_low_pfn = max_pfn;
	261	if (max_low_pfn > MAXMEM_PFN) {
	262	if (highmem_pages == -1)
	263	highmem_pages = max_pfn - MAXMEM_PFN;
	264	if (highmem_pages + MAXMEM_PFN < max_pfn)
	265	max_pfn = MAXMEM_PFN + highmem_pages;
	266	if (highmem_pages + MAXMEM_PFN > max_pfn) {
	267	printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
	268	highmem_pages = 0;
	269	}
	270	max_low_pfn = MAXMEM_PFN;
	271	#ifndef CONFIG_HIGHMEM
	272	/* Maximum memory usable is what is directly addressable */
	273	printk(KERN_WARNING "Warning only %ldMB will be used.\n",
	274	MAXMEM>>20);
	275	if (max_pfn > MAX_NONPAE_PFN)
	276	printk(KERN_WARNING "Use a PAE enabled kernel.\n");
	277	else
	278	printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
	279	max_pfn = MAXMEM_PFN;
	280	#else /* !CONFIG_HIGHMEM */
	281	#ifndef CONFIG_X86_PAE
	282	if (max_pfn > MAX_NONPAE_PFN) {
	283	max_pfn = MAX_NONPAE_PFN;
	284	printk(KERN_WARNING "Warning only 4GB will be used.\n");
	285	printk(KERN_WARNING "Use a PAE enabled kernel.\n");
	286	}
	287	#endif /* !CONFIG_X86_PAE */
	288	#endif /* !CONFIG_HIGHMEM */
	289	} else {
	290	if (highmem_pages == -1)
	291	highmem_pages = 0;
	292	#ifdef CONFIG_HIGHMEM
	293	if (highmem_pages >= max_pfn) {
	294	printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
	295	highmem_pages = 0;
	296	}
	297	if (highmem_pages) {
	298	if (max_low_pfn-highmem_pages < 6410241024/PAGE_SIZE){
	299	printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
	300	highmem_pages = 0;
	301	}
	302	max_low_pfn -= highmem_pages;
	303	}
	304	#else
	305	if (highmem_pages)
	306	printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
	307	#endif
	308	}
	309	return max_low_pfn;
	310	}
	311
1da177e4 LT	312	/*
	313	* workaround for Dell systems that neglect to reserve EBDA
	314	*/
	315	static void __init reserve_ebda_region(void)
	316	{
	317	unsigned int addr;
	318	addr = get_bios_ebda();
	319	if (addr)
	320	reserve_bootmem(addr, PAGE_SIZE);
	321	}
	322
05b79bdc	323	#ifndef CONFIG_NEED_MULTIPLE_NODES
1da177e4 LT	324	void __init setup_bootmem_allocator(void);
	325	static unsigned long __init setup_memory(void)
	326	{
	327	/*
	328	* partially used pages are not usable - thus
	329	* we are rounding upwards:
	330	*/
	331	min_low_pfn = PFN_UP(init_pg_tables_end);
	332
	333	find_max_pfn();
	334
	335	max_low_pfn = find_max_low_pfn();
	336
	337	#ifdef CONFIG_HIGHMEM
	338	highstart_pfn = highend_pfn = max_pfn;
	339	if (max_pfn > max_low_pfn) {
	340	highstart_pfn = max_low_pfn;
	341	}
	342	printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
	343	pages_to_mb(highend_pfn - highstart_pfn));
ba9c231f JB	344	num_physpages = highend_pfn;
	345	high_memory = (void ) __va(highstart_pfn PAGE_SIZE - 1) + 1;
	346	#else
	347	num_physpages = max_low_pfn;
	348	high_memory = (void ) __va(max_low_pfn PAGE_SIZE - 1) + 1;
	349	#endif
	350	#ifdef CONFIG_FLATMEM
	351	max_mapnr = num_physpages;
1da177e4 LT	352	#endif
	353	printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
	354	pages_to_mb(max_low_pfn));
	355
	356	setup_bootmem_allocator();
	357
	358	return max_low_pfn;
	359	}
	360
	361	void __init zone_sizes_init(void)
	362	{
6391af17 MG	363	unsigned long max_zone_pfns[MAX_NR_ZONES];
	364	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
	365	max_zone_pfns[ZONE_DMA] =
	366	virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	367	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
1da177e4	368	#ifdef CONFIG_HIGHMEM
6391af17	369	max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
4cfee88a MG	370	add_active_range(0, 0, highend_pfn);
4cfee88a MG	371	#else
4cfee88a	372	add_active_range(0, 0, max_low_pfn);
1da177e4	373	#endif
4cfee88a MG	374
4cfee88a MG	375	free_area_init_nodes(max_zone_pfns);
1da177e4 LT	376	}
1da177e4 LT	377	#else
05b79bdc	378	extern unsigned long __init setup_memory(void);
1da177e4	379	extern void zone_sizes_init(void);
05b79bdc	380	#endif /* !CONFIG_NEED_MULTIPLE_NODES */
1da177e4 LT	381
	382	void __init setup_bootmem_allocator(void)
	383	{
	384	unsigned long bootmap_size;
	385	/*
	386	* Initialize the boot-time allocator (with low memory only):
	387	*/
	388	bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
	389
	390	register_bootmem_low_pages(max_low_pfn);
	391
	392	/*
	393	* Reserve the bootmem bitmap itself as well. We do this in two
	394	* steps (first step was init_bootmem()) because this catches
	395	* the (very unlikely) case of us accidentally initializing the
	396	* bootmem allocator with an invalid RAM area.
	397	*/
8621b81c EB	398	reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
8621b81c EB	399	bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
1da177e4 LT	400
	401	/*
	402	* reserve physical page 0 - it's a special BIOS page on many boxes,
	403	* enabling clean reboots, SMP operation, laptop functions.
	404	*/
	405	reserve_bootmem(0, PAGE_SIZE);
	406
	407	/* reserve EBDA region, it's a 4K region */
	408	reserve_ebda_region();
	409
	410	/* could be an AMD 768MPX chipset. Reserve a page before VGA to prevent
	411	PCI prefetch into it (errata #56). Usually the page is reserved anyways,
	412	unless you have no PS/2 mouse plugged in. */
	413	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
	414	boot_cpu_data.x86 == 6)
	415	reserve_bootmem(0xa0000 - 4096, 4096);
	416
	417	#ifdef CONFIG_SMP
	418	/*
	419	* But first pinch a few for the stack/trampoline stuff
	420	* FIXME: Don't need the extra page at 4K, but need to fix
	421	* trampoline before removing it. (see the GDT stuff)
	422	*/
	423	reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
	424	#endif
	425	#ifdef CONFIG_ACPI_SLEEP
	426	/*
	427	* Reserve low memory region for sleep support.
	428	*/
	429	acpi_reserve_bootmem();
	430	#endif
	431	#ifdef CONFIG_X86_FIND_SMP_CONFIG
	432	/*
	433	* Find and reserve possible boot-time SMP configuration:
	434	*/
	435	find_smp_config();
	436	#endif
91023300	437	numa_kva_reserve();
1da177e4 LT	438	#ifdef CONFIG_BLK_DEV_INITRD
	439	if (LOADER_TYPE && INITRD_START) {
	440	if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
	441	reserve_bootmem(INITRD_START, INITRD_SIZE);
19e5d9c0	442	initrd_start = INITRD_START + PAGE_OFFSET;
1da177e4 LT	443	initrd_end = initrd_start+INITRD_SIZE;
	444	}
	445	else {
	446	printk(KERN_ERR "initrd extends beyond end of memory "
	447	"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
	448	INITRD_START + INITRD_SIZE,
	449	max_low_pfn << PAGE_SHIFT);
	450	initrd_start = 0;
	451	}
	452	}
	453	#endif
1bc3b91a EB	454	#ifdef CONFIG_KEXEC
	455	if (crashk_res.start != crashk_res.end)
	456	reserve_bootmem(crashk_res.start,
	457	crashk_res.end - crashk_res.start + 1);
	458	#endif
1da177e4 LT	459	}
	460
	461	/*
	462	* The node 0 pgdat is initialized before all of these because
	463	* it's needed for bootmem. node>0 pgdats have their virtual
	464	* space allocated before the pagetables are in place to access
	465	* them, so they can't be cleared then.
	466	*
	467	* This should all compile down to nothing when NUMA is off.
	468	*/
	469	void __init remapped_pgdat_init(void)
	470	{
	471	int nid;
	472
	473	for_each_online_node(nid) {
	474	if (nid != 0)
	475	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
	476	}
	477	}
	478
1da177e4 LT	479	#ifdef CONFIG_MCA
	480	static void set_mca_bus(int x)
	481	{
	482	MCA_bus = x;
	483	}
	484	#else
	485	static void set_mca_bus(int x) { }
	486	#endif
	487
d3561b7f	488	/* Overridden in paravirt.c if CONFIG_PARAVIRT */
88d20328	489	char * __init __attribute__((weak)) memory_setup(void)
d3561b7f RR	490	{
	491	return machine_specific_memory_setup();
	492	}
	493
1da177e4 LT	494	/*
	495	* Determine if we were loaded by an EFI loader. If so, then we have also been
	496	* passed the efi memmap, systab, etc., so we should use these data structures
	497	* for initialization. Note, the efi init code path is determined by the
	498	* global efi_enabled. This allows the same kernel image to be used on existing
	499	* systems (with a traditional BIOS) as well as on EFI systems.
	500	*/
	501	void __init setup_arch(char **cmdline_p)
	502	{
	503	unsigned long max_low_pfn;
	504
	505	memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
	506	pre_setup_arch_hook();
	507	early_cpu_init();
	508
	509	/*
	510	* FIXME: This isn't an official loader_type right
	511	* now but does currently work with elilo.
	512	* If we were configured as an EFI kernel, check to make
	513	* sure that we were loaded correctly from elilo and that
	514	* the system table is valid. If not, then initialize normally.
	515	*/
	516	#ifdef CONFIG_EFI
	517	if ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
	518	efi_enabled = 1;
	519	#endif
	520
	521	ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
1da177e4 LT	522	screen_info = SCREEN_INFO;
	523	edid_info = EDID_INFO;
	524	apm_info.bios = APM_BIOS_INFO;
	525	ist_info = IST_INFO;
	526	saved_videomode = VIDEO_MODE;
	527	if( SYS_DESC_TABLE.length != 0 ) {
	528	set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2);
	529	machine_id = SYS_DESC_TABLE.table[0];
	530	machine_submodel_id = SYS_DESC_TABLE.table[1];
	531	BIOS_revision = SYS_DESC_TABLE.table[2];
	532	}
	533	bootloader_type = LOADER_TYPE;
	534
	535	#ifdef CONFIG_BLK_DEV_RAM
	536	rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
	537	rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
	538	rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
	539	#endif
	540	ARCH_SETUP
	541	if (efi_enabled)
	542	efi_init();
	543	else {
	544	printk(KERN_INFO "BIOS-provided physical RAM map:\n");
d3561b7f	545	print_memory_map(memory_setup());
1da177e4 LT	546	}
	547
	548	copy_edd();
	549
	550	if (!MOUNT_ROOT_RDONLY)
	551	root_mountflags &= ~MS_RDONLY;
	552	init_mm.start_code = (unsigned long) _text;
	553	init_mm.end_code = (unsigned long) _etext;
	554	init_mm.end_data = (unsigned long) _edata;
	555	init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
	556
	557	code_resource.start = virt_to_phys(_text);
	558	code_resource.end = virt_to_phys(_etext)-1;
	559	data_resource.start = virt_to_phys(_etext);
	560	data_resource.end = virt_to_phys(_edata)-1;
	561
1a3f239d	562	parse_early_param();
1da177e4	563
1a3f239d RR	564	if (user_defined_memmap) {
	565	printk(KERN_INFO "user-defined physical RAM map:\n");
	566	print_memory_map("user");
99b7de33	567	}
1a3f239d	568
4e498b66	569	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
1a3f239d	570	*cmdline_p = command_line;
99b7de33	571
1da177e4 LT	572	max_low_pfn = setup_memory();
1da177e4 LT	573
7ce0bcfd ZA	574	#ifdef CONFIG_VMI
	575	/*
	576	* Must be after max_low_pfn is determined, and before kernel
	577	* pagetables are setup.
	578	*/
	579	vmi_init();
	580	#endif
	581
1da177e4 LT	582	/*
	583	* NOTE: before this point _nobody_ is allowed to allocate
	584	* any memory using the bootmem allocator. Although the
	585	* alloctor is now initialised only the first 8Mb of the kernel
	586	* virtual address space has been mapped. All allocations before
	587	* paging_init() has completed must use the alloc_bootmem_low_pages()
	588	* variant (which allocates DMA'able memory) and care must be taken
	589	* not to exceed the 8Mb limit.
	590	*/
	591
	592	#ifdef CONFIG_SMP
	593	smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
	594	#endif
	595	paging_init();
	596	remapped_pgdat_init();
05b79bdc	597	sparse_init();
1da177e4 LT	598	zone_sizes_init();
	599
	600	/*
	601	* NOTE: at this point the bootmem allocator is fully available.
	602	*/
	603
6996d3b6 JF	604	paravirt_post_allocator_init();
6996d3b6 JF	605
1da177e4 LT	606	dmi_scan_machine();
	607
	608	#ifdef CONFIG_X86_GENERICARCH
1a3f239d	609	generic_apic_probe();
1da177e4 LT	610	#endif
	611	if (efi_enabled)
	612	efi_map_memmap();
	613
888ba6c6	614	#ifdef CONFIG_ACPI
1da177e4 LT	615	/*
	616	* Parse the ACPI tables for possible boot-time SMP configuration.
	617	*/
	618	acpi_boot_table_init();
d44647b0 AC	619	#endif
d44647b0 AC	620
f157cbb1	621	#ifdef CONFIG_PCI
d44647b0 AC	622	#ifdef CONFIG_X86_IO_APIC
	623	check_acpi_pci(); /* Checks more than just ACPI actually */
	624	#endif
f157cbb1	625	#endif
d44647b0 AC	626
d44647b0 AC	627	#ifdef CONFIG_ACPI
1da177e4 LT	628	acpi_boot_init();
1da177e4 LT	629
911a62d4 VP	630	#if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
	631	if (def_to_bigsmp)
	632	printk(KERN_WARNING "More than 8 CPUs detected and "
	633	"CONFIG_X86_PC cannot handle it.\nUse "
	634	"CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
	635	#endif
	636	#endif
1da177e4 LT	637	#ifdef CONFIG_X86_LOCAL_APIC
	638	if (smp_found_config)
	639	get_smp_config();
	640	#endif
	641
5c95da9f	642	e820_register_memory();
1da177e4 LT	643
	644	#ifdef CONFIG_VT
	645	#if defined(CONFIG_VGA_CONSOLE)
	646	if (!efi_enabled \|\| (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
	647	conswitchp = &vga_con;
	648	#elif defined(CONFIG_DUMMY_CONSOLE)
	649	conswitchp = &dummy_con;
	650	#endif
	651	#endif
	652	}