[deliverable/linux.git] / arch / x86 / kernel / setup_32.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 HIGHMEM64G enabled kernel.\n");
		else
			printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
		max_pfn = MAXMEM_PFN;
#else /* !CONFIG_HIGHMEM */
#ifndef CONFIG_HIGHMEM64G
		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 HIGHMEM64G enabled kernel.\n");
		}
#endif /* !CONFIG_HIGHMEM64G */
#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.
 */
static 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();
	e820_mark_nosave_regions();

#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	1	/*
1da177e4 LT	2	* Copyright (C) 1995 Linus Torvalds
	3	*
	4	* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
	5	*
	6	* Memory region support
	7	* David Parsons <orc@pell.chi.il.us>, July-August 1999
	8	*
	9	* Added E820 sanitization routine (removes overlapping memory regions);
	10	* Brian Moyle <bmoyle@mvista.com>, February 2001
	11	*
	12	* Moved CPU detection code to cpu/${cpu}.c
	13	* Patrick Mochel <mochel@osdl.org>, March 2002
	14	*
	15	* Provisions for empty E820 memory regions (reported by certain BIOSes).
	16	* Alex Achenbach <xela@slit.de>, December 2002.
	17	*
	18	*/
	19
	20	/*
	21	* This file handles the architecture-dependent parts of initialization
	22	*/
	23
	24	#include <linux/sched.h>
	25	#include <linux/mm.h>
05b79bdc	26	#include <linux/mmzone.h>
894673ee	27	#include <linux/screen_info.h>
1da177e4 LT	28	#include <linux/ioport.h>
	29	#include <linux/acpi.h>
	30	#include <linux/apm_bios.h>
	31	#include <linux/initrd.h>
	32	#include <linux/bootmem.h>
	33	#include <linux/seq_file.h>
	34	#include <linux/console.h>
	35	#include <linux/mca.h>
	36	#include <linux/root_dev.h>
	37	#include <linux/highmem.h>
	38	#include <linux/module.h>
	39	#include <linux/efi.h>
	40	#include <linux/init.h>
	41	#include <linux/edd.h>
	42	#include <linux/nodemask.h>
1bc3b91a	43	#include <linux/kexec.h>
2030eae5	44	#include <linux/crash_dump.h>
e9928674	45	#include <linux/dmi.h>
22a9835c	46	#include <linux/pfn.h>
1bc3b91a	47
1da177e4	48	#include <video/edid.h>
1bc3b91a	49
9635b47d	50	#include <asm/apic.h>
1da177e4 LT	51	#include <asm/e820.h>
1da177e4 LT	52	#include <asm/mpspec.h>
91023300	53	#include <asm/mmzone.h>
1da177e4 LT	54	#include <asm/setup.h>
	55	#include <asm/arch_hooks.h>
	56	#include <asm/sections.h>
	57	#include <asm/io_apic.h>
	58	#include <asm/ist.h>
	59	#include <asm/io.h>
7ce0bcfd	60	#include <asm/vmi.h>
e75eac33	61	#include <setup_arch.h>
1da177e4 LT	62	#include <bios_ebda.h>
	63
	64	/* This value is set up by the early boot code to point to the value
	65	immediately after the boot time page tables. It contains a physical
	66	address, and must not be in the .bss segment! */
	67	unsigned long init_pg_tables_end __initdata = ~0UL;
	68
0bb3184d	69	int disable_pse __devinitdata = 0;
1da177e4 LT	70
	71	/*
	72	* Machine setup..
	73	*/
269c2d81	74	extern struct resource code_resource;
269c2d81	75	extern struct resource data_resource;
1da177e4 LT	76
1da177e4 LT	77	/* cpu data as detected by the assembly code in head.S */
4a5d107a	78	struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
1da177e4	79	/* common cpu data for all cpus */
c3d8c141	80	struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
129f6946	81	EXPORT_SYMBOL(boot_cpu_data);
1da177e4 LT	82
	83	unsigned long mmu_cr4_features;
	84
1da177e4 LT	85	/* for MCA, but anyone else can use it if they want */
1da177e4 LT	86	unsigned int machine_id;
129f6946 AD	87	#ifdef CONFIG_MCA
	88	EXPORT_SYMBOL(machine_id);
	89	#endif
1da177e4 LT	90	unsigned int machine_submodel_id;
	91	unsigned int BIOS_revision;
	92	unsigned int mca_pentium_flag;
	93
1da177e4 LT	94	/* Boot loader ID as an integer, for the benefit of proc_dointvec */
	95	int bootloader_type;
	96
	97	/* user-defined highmem size */
	98	static unsigned int highmem_pages = -1;
	99
	100	/*
	101	* Setup options
	102	*/
1da177e4	103	struct screen_info screen_info;
129f6946	104	EXPORT_SYMBOL(screen_info);
1da177e4	105	struct apm_info apm_info;
129f6946	106	EXPORT_SYMBOL(apm_info);
1da177e4	107	struct edid_info edid_info;
5e518d76	108	EXPORT_SYMBOL_GPL(edid_info);
1da177e4	109	struct ist_info ist_info;
129f6946 AD	110	#if defined(CONFIG_X86_SPEEDSTEP_SMI) \|\| \
	111	defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
	112	EXPORT_SYMBOL(ist_info);
	113	#endif
1da177e4 LT	114
1da177e4 LT	115	extern void early_cpu_init(void);
1da177e4 LT	116	extern int root_mountflags;
	117
	118	unsigned long saved_videomode;
	119
	120	#define RAMDISK_IMAGE_START_MASK 0x07FF
	121	#define RAMDISK_PROMPT_FLAG 0x8000
	122	#define RAMDISK_LOAD_FLAG 0x4000
	123
4e498b66	124	static char __initdata command_line[COMMAND_LINE_SIZE];
1da177e4	125
48c7ae67	126	struct boot_params __initdata boot_params;
1da177e4	127
1da177e4 LT	128	#if defined(CONFIG_EDD) \|\| defined(CONFIG_EDD_MODULE)
	129	struct edd edd;
	130	#ifdef CONFIG_EDD_MODULE
	131	EXPORT_SYMBOL(edd);
	132	#endif
	133	/**
	134	* copy_edd() - Copy the BIOS EDD information
	135	* from boot_params into a safe place.
	136	*
	137	*/
	138	static inline void copy_edd(void)
	139	{
	140	memcpy(edd.mbr_signature, EDD_MBR_SIGNATURE, sizeof(edd.mbr_signature));
	141	memcpy(edd.edd_info, EDD_BUF, sizeof(edd.edd_info));
	142	edd.mbr_signature_nr = EDD_MBR_SIG_NR;
	143	edd.edd_info_nr = EDD_NR;
	144	}
	145	#else
	146	static inline void copy_edd(void)
	147	{
	148	}
	149	#endif
	150
cef518e8	151	int __initdata user_defined_memmap = 0;
1da177e4	152
1a3f239d RR	153	/*
	154	* "mem=nopentium" disables the 4MB page tables.
	155	* "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
	156	* to <mem>, overriding the bios size.
	157	* "memmap=XXX[KkmM]@XXX[KkmM]" defines a memory region from
	158	* <start> to <start>+<mem>, overriding the bios size.
	159	*
	160	* HPA tells me bootloaders need to parse mem=, so no new
	161	* option should be mem= [also see Documentation/i386/boot.txt]
	162	*/
	163	static int __init parse_mem(char *arg)
	164	{
	165	if (!arg)
	166	return -EINVAL;
1da177e4	167
1a3f239d RR	168	if (strcmp(arg, "nopentium") == 0) {
	169	clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
	170	disable_pse = 1;
	171	} else {
	172	/* If the user specifies memory size, we
	173	* limit the BIOS-provided memory map to
	174	* that size. exactmap can be used to specify
	175	* the exact map. mem=number can be used to
	176	* trim the existing memory map.
1da177e4	177	*/
1a3f239d	178	unsigned long long mem_size;
1da177e4	179
1a3f239d RR	180	mem_size = memparse(arg, &arg);
	181	limit_regions(mem_size);
	182	user_defined_memmap = 1;
	183	}
	184	return 0;
	185	}
	186	early_param("mem", parse_mem);
1da177e4	187
1a3f239d RR	188	#ifdef CONFIG_PROC_VMCORE
	189	/* elfcorehdr= specifies the location of elf core header
	190	* stored by the crashed kernel.
	191	*/
	192	static int __init parse_elfcorehdr(char *arg)
	193	{
	194	if (!arg)
	195	return -EINVAL;
66759a01	196
1a3f239d RR	197	elfcorehdr_addr = memparse(arg, &arg);
	198	return 0;
	199	}
	200	early_param("elfcorehdr", parse_elfcorehdr);
	201	#endif /* CONFIG_PROC_VMCORE */
1da177e4	202
1a3f239d RR	203	/*
	204	* highmem=size forces highmem to be exactly 'size' bytes.
	205	* This works even on boxes that have no highmem otherwise.
	206	* This also works to reduce highmem size on bigger boxes.
	207	*/
	208	static int __init parse_highmem(char *arg)
	209	{
	210	if (!arg)
	211	return -EINVAL;
9635b47d	212
1a3f239d RR	213	highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT;
	214	return 0;
	215	}
	216	early_param("highmem", parse_highmem);
9635b47d	217
1a3f239d RR	218	/*
	219	* vmalloc=size forces the vmalloc area to be exactly 'size'
	220	* bytes. This can be used to increase (or decrease) the
	221	* vmalloc area - the default is 128m.
	222	*/
	223	static int __init parse_vmalloc(char *arg)
	224	{
	225	if (!arg)
	226	return -EINVAL;
1bc3b91a	227
1a3f239d RR	228	__VMALLOC_RESERVE = memparse(arg, &arg);
1a3f239d RR	229	return 0;
1da177e4	230	}
1a3f239d	231	early_param("vmalloc", parse_vmalloc);
1da177e4	232
461a9aff ZA	233	/*
	234	* reservetop=size reserves a hole at the top of the kernel address space which
	235	* a hypervisor can load into later. Needed for dynamically loaded hypervisors,
	236	* so relocating the fixmap can be done before paging initialization.
	237	*/
	238	static int __init parse_reservetop(char *arg)
	239	{
	240	unsigned long address;
	241
	242	if (!arg)
	243	return -EINVAL;
	244
	245	address = memparse(arg, &arg);
	246	reserve_top_address(address);
	247	return 0;
	248	}
	249	early_param("reservetop", parse_reservetop);
	250
1da177e4 LT	251	/*
	252	* Determine low and high memory ranges:
	253	*/
	254	unsigned long __init find_max_low_pfn(void)
	255	{
	256	unsigned long max_low_pfn;
	257
	258	max_low_pfn = max_pfn;
	259	if (max_low_pfn > MAXMEM_PFN) {
	260	if (highmem_pages == -1)
	261	highmem_pages = max_pfn - MAXMEM_PFN;
	262	if (highmem_pages + MAXMEM_PFN < max_pfn)
	263	max_pfn = MAXMEM_PFN + highmem_pages;
	264	if (highmem_pages + MAXMEM_PFN > max_pfn) {
	265	printk("only %luMB highmem pages available, ignoring highmem size of %uMB.\n", pages_to_mb(max_pfn - MAXMEM_PFN), pages_to_mb(highmem_pages));
	266	highmem_pages = 0;
	267	}
	268	max_low_pfn = MAXMEM_PFN;
	269	#ifndef CONFIG_HIGHMEM
	270	/* Maximum memory usable is what is directly addressable */
	271	printk(KERN_WARNING "Warning only %ldMB will be used.\n",
	272	MAXMEM>>20);
	273	if (max_pfn > MAX_NONPAE_PFN)
c673f1a9	274	printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
1da177e4 LT	275	else
	276	printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
	277	max_pfn = MAXMEM_PFN;
	278	#else /* !CONFIG_HIGHMEM */
c673f1a9	279	#ifndef CONFIG_HIGHMEM64G
1da177e4 LT	280	if (max_pfn > MAX_NONPAE_PFN) {
	281	max_pfn = MAX_NONPAE_PFN;
	282	printk(KERN_WARNING "Warning only 4GB will be used.\n");
c673f1a9	283	printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n");
1da177e4	284	}
c673f1a9	285	#endif /* !CONFIG_HIGHMEM64G */
1da177e4 LT	286	#endif /* !CONFIG_HIGHMEM */
	287	} else {
	288	if (highmem_pages == -1)
	289	highmem_pages = 0;
	290	#ifdef CONFIG_HIGHMEM
	291	if (highmem_pages >= max_pfn) {
	292	printk(KERN_ERR "highmem size specified (%uMB) is bigger than pages available (%luMB)!.\n", pages_to_mb(highmem_pages), pages_to_mb(max_pfn));
	293	highmem_pages = 0;
	294	}
	295	if (highmem_pages) {
	296	if (max_low_pfn-highmem_pages < 6410241024/PAGE_SIZE){
	297	printk(KERN_ERR "highmem size %uMB results in smaller than 64MB lowmem, ignoring it.\n", pages_to_mb(highmem_pages));
	298	highmem_pages = 0;
	299	}
	300	max_low_pfn -= highmem_pages;
	301	}
	302	#else
	303	if (highmem_pages)
	304	printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n");
	305	#endif
	306	}
	307	return max_low_pfn;
	308	}
	309
1da177e4 LT	310	/*
	311	* workaround for Dell systems that neglect to reserve EBDA
	312	*/
	313	static void __init reserve_ebda_region(void)
	314	{
	315	unsigned int addr;
	316	addr = get_bios_ebda();
	317	if (addr)
	318	reserve_bootmem(addr, PAGE_SIZE);
	319	}
	320
05b79bdc	321	#ifndef CONFIG_NEED_MULTIPLE_NODES
1da177e4 LT	322	void __init setup_bootmem_allocator(void);
	323	static unsigned long __init setup_memory(void)
	324	{
	325	/*
	326	* partially used pages are not usable - thus
	327	* we are rounding upwards:
	328	*/
	329	min_low_pfn = PFN_UP(init_pg_tables_end);
	330
	331	find_max_pfn();
	332
	333	max_low_pfn = find_max_low_pfn();
	334
	335	#ifdef CONFIG_HIGHMEM
	336	highstart_pfn = highend_pfn = max_pfn;
	337	if (max_pfn > max_low_pfn) {
	338	highstart_pfn = max_low_pfn;
	339	}
	340	printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
	341	pages_to_mb(highend_pfn - highstart_pfn));
ba9c231f JB	342	num_physpages = highend_pfn;
	343	high_memory = (void ) __va(highstart_pfn PAGE_SIZE - 1) + 1;
	344	#else
	345	num_physpages = max_low_pfn;
	346	high_memory = (void ) __va(max_low_pfn PAGE_SIZE - 1) + 1;
	347	#endif
	348	#ifdef CONFIG_FLATMEM
	349	max_mapnr = num_physpages;
1da177e4 LT	350	#endif
	351	printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
	352	pages_to_mb(max_low_pfn));
	353
	354	setup_bootmem_allocator();
	355
	356	return max_low_pfn;
	357	}
	358
	359	void __init zone_sizes_init(void)
	360	{
6391af17 MG	361	unsigned long max_zone_pfns[MAX_NR_ZONES];
	362	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
	363	max_zone_pfns[ZONE_DMA] =
	364	virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	365	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
1da177e4	366	#ifdef CONFIG_HIGHMEM
6391af17	367	max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
4cfee88a MG	368	add_active_range(0, 0, highend_pfn);
4cfee88a MG	369	#else
4cfee88a	370	add_active_range(0, 0, max_low_pfn);
1da177e4	371	#endif
4cfee88a MG	372
4cfee88a MG	373	free_area_init_nodes(max_zone_pfns);
1da177e4 LT	374	}
1da177e4 LT	375	#else
05b79bdc	376	extern unsigned long __init setup_memory(void);
1da177e4	377	extern void zone_sizes_init(void);
05b79bdc	378	#endif /* !CONFIG_NEED_MULTIPLE_NODES */
1da177e4 LT	379
	380	void __init setup_bootmem_allocator(void)
	381	{
	382	unsigned long bootmap_size;
	383	/*
	384	* Initialize the boot-time allocator (with low memory only):
	385	*/
	386	bootmap_size = init_bootmem(min_low_pfn, max_low_pfn);
	387
	388	register_bootmem_low_pages(max_low_pfn);
	389
	390	/*
	391	* Reserve the bootmem bitmap itself as well. We do this in two
	392	* steps (first step was init_bootmem()) because this catches
	393	* the (very unlikely) case of us accidentally initializing the
	394	* bootmem allocator with an invalid RAM area.
	395	*/
8621b81c EB	396	reserve_bootmem(__pa_symbol(_text), (PFN_PHYS(min_low_pfn) +
8621b81c EB	397	bootmap_size + PAGE_SIZE-1) - __pa_symbol(_text));
1da177e4 LT	398
	399	/*
	400	* reserve physical page 0 - it's a special BIOS page on many boxes,
	401	* enabling clean reboots, SMP operation, laptop functions.
	402	*/
	403	reserve_bootmem(0, PAGE_SIZE);
	404
	405	/* reserve EBDA region, it's a 4K region */
	406	reserve_ebda_region();
	407
	408	/* could be an AMD 768MPX chipset. Reserve a page before VGA to prevent
	409	PCI prefetch into it (errata #56). Usually the page is reserved anyways,
	410	unless you have no PS/2 mouse plugged in. */
	411	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
	412	boot_cpu_data.x86 == 6)
	413	reserve_bootmem(0xa0000 - 4096, 4096);
	414
	415	#ifdef CONFIG_SMP
	416	/*
	417	* But first pinch a few for the stack/trampoline stuff
	418	* FIXME: Don't need the extra page at 4K, but need to fix
	419	* trampoline before removing it. (see the GDT stuff)
	420	*/
	421	reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
	422	#endif
673d5b43	423	#ifdef CONFIG_ACPI_SLEEP
1da177e4 LT	424	/*
	425	* Reserve low memory region for sleep support.
	426	*/
	427	acpi_reserve_bootmem();
	428	#endif
	429	#ifdef CONFIG_X86_FIND_SMP_CONFIG
	430	/*
	431	* Find and reserve possible boot-time SMP configuration:
	432	*/
	433	find_smp_config();
	434	#endif
91023300	435	numa_kva_reserve();
1da177e4 LT	436	#ifdef CONFIG_BLK_DEV_INITRD
	437	if (LOADER_TYPE && INITRD_START) {
	438	if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
	439	reserve_bootmem(INITRD_START, INITRD_SIZE);
19e5d9c0	440	initrd_start = INITRD_START + PAGE_OFFSET;
1da177e4 LT	441	initrd_end = initrd_start+INITRD_SIZE;
	442	}
	443	else {
	444	printk(KERN_ERR "initrd extends beyond end of memory "
	445	"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
	446	INITRD_START + INITRD_SIZE,
	447	max_low_pfn << PAGE_SHIFT);
	448	initrd_start = 0;
	449	}
	450	}
	451	#endif
1bc3b91a EB	452	#ifdef CONFIG_KEXEC
	453	if (crashk_res.start != crashk_res.end)
	454	reserve_bootmem(crashk_res.start,
	455	crashk_res.end - crashk_res.start + 1);
	456	#endif
1da177e4 LT	457	}
	458
	459	/*
	460	* The node 0 pgdat is initialized before all of these because
	461	* it's needed for bootmem. node>0 pgdats have their virtual
	462	* space allocated before the pagetables are in place to access
	463	* them, so they can't be cleared then.
	464	*
	465	* This should all compile down to nothing when NUMA is off.
	466	*/
10079ae3	467	static void __init remapped_pgdat_init(void)
1da177e4 LT	468	{
	469	int nid;
	470
	471	for_each_online_node(nid) {
	472	if (nid != 0)
	473	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
	474	}
	475	}
	476
1da177e4 LT	477	#ifdef CONFIG_MCA
	478	static void set_mca_bus(int x)
	479	{
	480	MCA_bus = x;
	481	}
	482	#else
	483	static void set_mca_bus(int x) { }
	484	#endif
	485
d3561b7f	486	/* Overridden in paravirt.c if CONFIG_PARAVIRT */
88d20328	487	char * __init __attribute__((weak)) memory_setup(void)
d3561b7f RR	488	{
	489	return machine_specific_memory_setup();
	490	}
	491
1da177e4 LT	492	/*
	493	* Determine if we were loaded by an EFI loader. If so, then we have also been
	494	* passed the efi memmap, systab, etc., so we should use these data structures
	495	* for initialization. Note, the efi init code path is determined by the
	496	* global efi_enabled. This allows the same kernel image to be used on existing
	497	* systems (with a traditional BIOS) as well as on EFI systems.
	498	*/
	499	void __init setup_arch(char **cmdline_p)
	500	{
	501	unsigned long max_low_pfn;
	502
	503	memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
	504	pre_setup_arch_hook();
	505	early_cpu_init();
	506
	507	/*
	508	* FIXME: This isn't an official loader_type right
	509	* now but does currently work with elilo.
	510	* If we were configured as an EFI kernel, check to make
	511	* sure that we were loaded correctly from elilo and that
	512	* the system table is valid. If not, then initialize normally.
	513	*/
	514	#ifdef CONFIG_EFI
	515	if ((LOADER_TYPE == 0x50) && EFI_SYSTAB)
	516	efi_enabled = 1;
	517	#endif
	518
	519	ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
1da177e4 LT	520	screen_info = SCREEN_INFO;
	521	edid_info = EDID_INFO;
	522	apm_info.bios = APM_BIOS_INFO;
	523	ist_info = IST_INFO;
	524	saved_videomode = VIDEO_MODE;
	525	if( SYS_DESC_TABLE.length != 0 ) {
	526	set_mca_bus(SYS_DESC_TABLE.table[3] & 0x2);
	527	machine_id = SYS_DESC_TABLE.table[0];
	528	machine_submodel_id = SYS_DESC_TABLE.table[1];
	529	BIOS_revision = SYS_DESC_TABLE.table[2];
	530	}
	531	bootloader_type = LOADER_TYPE;
	532
	533	#ifdef CONFIG_BLK_DEV_RAM
	534	rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
	535	rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
	536	rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
	537	#endif
	538	ARCH_SETUP
	539	if (efi_enabled)
	540	efi_init();
	541	else {
	542	printk(KERN_INFO "BIOS-provided physical RAM map:\n");
d3561b7f	543	print_memory_map(memory_setup());
1da177e4 LT	544	}
	545
	546	copy_edd();
	547
	548	if (!MOUNT_ROOT_RDONLY)
	549	root_mountflags &= ~MS_RDONLY;
	550	init_mm.start_code = (unsigned long) _text;
	551	init_mm.end_code = (unsigned long) _etext;
	552	init_mm.end_data = (unsigned long) _edata;
	553	init_mm.brk = init_pg_tables_end + PAGE_OFFSET;
	554
	555	code_resource.start = virt_to_phys(_text);
	556	code_resource.end = virt_to_phys(_etext)-1;
	557	data_resource.start = virt_to_phys(_etext);
	558	data_resource.end = virt_to_phys(_edata)-1;
	559
1a3f239d	560	parse_early_param();
1da177e4	561
1a3f239d RR	562	if (user_defined_memmap) {
	563	printk(KERN_INFO "user-defined physical RAM map:\n");
	564	print_memory_map("user");
99b7de33	565	}
1a3f239d	566
4e498b66	567	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
1a3f239d	568	*cmdline_p = command_line;
99b7de33	569
1da177e4 LT	570	max_low_pfn = setup_memory();
1da177e4 LT	571
7ce0bcfd ZA	572	#ifdef CONFIG_VMI
	573	/*
	574	* Must be after max_low_pfn is determined, and before kernel
	575	* pagetables are setup.
	576	*/
	577	vmi_init();
	578	#endif
	579
1da177e4 LT	580	/*
	581	* NOTE: before this point _nobody_ is allowed to allocate
	582	* any memory using the bootmem allocator. Although the
	583	* alloctor is now initialised only the first 8Mb of the kernel
	584	* virtual address space has been mapped. All allocations before
	585	* paging_init() has completed must use the alloc_bootmem_low_pages()
	586	* variant (which allocates DMA'able memory) and care must be taken
	587	* not to exceed the 8Mb limit.
	588	*/
	589
	590	#ifdef CONFIG_SMP
	591	smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
	592	#endif
	593	paging_init();
	594	remapped_pgdat_init();
05b79bdc	595	sparse_init();
1da177e4 LT	596	zone_sizes_init();
	597
	598	/*
	599	* NOTE: at this point the bootmem allocator is fully available.
	600	*/
	601
6996d3b6 JF	602	paravirt_post_allocator_init();
6996d3b6 JF	603
1da177e4 LT	604	dmi_scan_machine();
	605
	606	#ifdef CONFIG_X86_GENERICARCH
1a3f239d	607	generic_apic_probe();
1da177e4 LT	608	#endif
	609	if (efi_enabled)
	610	efi_map_memmap();
	611
888ba6c6	612	#ifdef CONFIG_ACPI
1da177e4 LT	613	/*
	614	* Parse the ACPI tables for possible boot-time SMP configuration.
	615	*/
	616	acpi_boot_table_init();
d44647b0 AC	617	#endif
d44647b0 AC	618
f157cbb1	619	#ifdef CONFIG_PCI
d44647b0 AC	620	#ifdef CONFIG_X86_IO_APIC
	621	check_acpi_pci(); /* Checks more than just ACPI actually */
	622	#endif
f157cbb1	623	#endif
d44647b0 AC	624
d44647b0 AC	625	#ifdef CONFIG_ACPI
1da177e4 LT	626	acpi_boot_init();
1da177e4 LT	627
911a62d4 VP	628	#if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
	629	if (def_to_bigsmp)
	630	printk(KERN_WARNING "More than 8 CPUs detected and "
	631	"CONFIG_X86_PC cannot handle it.\nUse "
	632	"CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
	633	#endif
	634	#endif
1da177e4 LT	635	#ifdef CONFIG_X86_LOCAL_APIC
	636	if (smp_found_config)
	637	get_smp_config();
	638	#endif
	639
5c95da9f	640	e820_register_memory();
1c10070a	641	e820_mark_nosave_regions();
1da177e4 LT	642
	643	#ifdef CONFIG_VT
	644	#if defined(CONFIG_VGA_CONSOLE)
	645	if (!efi_enabled \|\| (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
	646	conswitchp = &vga_con;
	647	#elif defined(CONFIG_DUMMY_CONSOLE)
	648	conswitchp = &dummy_con;
	649	#endif
	650	#endif
	651	}