/*

   *  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/sfi.h>

  #include <linux/apm_bios.h>
  #include <linux/initrd.h>
  #include <linux/bootmem.h>

  #include <linux/memblock.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/iscsi_ibft.h>

  #include <linux/nodemask.h>

  #include <linux/kexec.h>

  #include <linux/dmi.h>

  #include <linux/pfn.h>

  #include <linux/pci.h>

  #include <asm/pci-direct.h>

  #include <linux/init_ohci1394_dma.h>

  #include <linux/kvm_para.h>

  #include <linux/errno.h>
  #include <linux/kernel.h>
  #include <linux/stddef.h>
  #include <linux/unistd.h>
  #include <linux/ptrace.h>

  #include <linux/user.h>
  #include <linux/delay.h>

  
  #include <linux/kallsyms.h>

  #include <linux/cpufreq.h>
  #include <linux/dma-mapping.h>
  #include <linux/ctype.h>
  #include <linux/uaccess.h>
  
  #include <linux/percpu.h>
  #include <linux/crash_dump.h>

  #include <linux/tboot.h>

  #include <video/edid.h>

  #include <asm/mtrr.h>

  #include <asm/apic.h>

  #include <asm/trampoline.h>

  #include <asm/e820.h>
  #include <asm/mpspec.h>
  #include <asm/setup.h>

  #include <asm/efi.h>

  #include <asm/timer.h>
  #include <asm/i8259.h>

  #include <asm/sections.h>

  #include <asm/dmi.h>

  #include <asm/io_apic.h>
  #include <asm/ist.h>

  #include <asm/setup_arch.h>

  #include <asm/bios_ebda.h>

  #include <asm/cacheflush.h>

  #include <asm/processor.h>

  #include <asm/bugs.h>

  #include <asm/system.h>
  #include <asm/vsyscall.h>

  #include <asm/cpu.h>

  #include <asm/desc.h>
  #include <asm/dma.h>

  #include <asm/iommu.h>

  #include <asm/gart.h>

  #include <asm/mmu_context.h>
  #include <asm/proto.h>

  #include <asm/paravirt.h>

  #include <asm/hypervisor.h>

  #include <asm/olpc_ofw.h>

  
  #include <asm/percpu.h>

  #include <asm/topology.h>
  #include <asm/apicdef.h>

  #include <asm/amd_nb.h>

  #ifdef CONFIG_X86_64
  #include <asm/numa_64.h>
  #endif

  #include <asm/mce.h>

  #include <asm/alternative.h>

  #include <asm/prom.h>

  /*
   * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
   * The direct mapping extends to max_pfn_mapped, so that we can directly access
   * apertures, ACPI and other tables without having to play with fixmaps.
   */
  unsigned long max_low_pfn_mapped;
  unsigned long max_pfn_mapped;

  #ifdef CONFIG_DMI

  RESERVE_BRK(dmi_alloc, 65536);

  #endif

  static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
  unsigned long _brk_end = (unsigned long)__brk_base;

  #ifdef CONFIG_X86_64
  int default_cpu_present_to_apicid(int mps_cpu)
  {
  	return __default_cpu_present_to_apicid(mps_cpu);
  }

  int default_check_phys_apicid_present(int phys_apicid)

  {

  	return __default_check_phys_apicid_present(phys_apicid);

  }
  #endif

  #ifndef CONFIG_DEBUG_BOOT_PARAMS
  struct boot_params __initdata boot_params;
  #else
  struct boot_params boot_params;
  #endif

  /*
   * Machine setup..
   */

  static struct resource data_resource = {
  	.name	= "Kernel data",
  	.start	= 0,
  	.end	= 0,
  	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
  };
  
  static struct resource code_resource = {
  	.name	= "Kernel code",
  	.start	= 0,
  	.end	= 0,
  	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
  };
  
  static struct resource bss_resource = {
  	.name	= "Kernel bss",
  	.start	= 0,
  	.end	= 0,
  	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
  };

  
  #ifdef CONFIG_X86_32

  /* 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);

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

  unsigned int def_to_bigsmp;

  /* for MCA, but anyone else can use it if they want */
  unsigned int machine_id;
  unsigned int machine_submodel_id;
  unsigned int BIOS_revision;

  struct apm_info apm_info;
  EXPORT_SYMBOL(apm_info);
  
  #if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
  	defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
  struct ist_info ist_info;
  EXPORT_SYMBOL(ist_info);
  #else
  struct ist_info ist_info;
  #endif
  
  #else

  struct cpuinfo_x86 boot_cpu_data __read_mostly = {
  	.x86_phys_bits = MAX_PHYSMEM_BITS,
  };

  EXPORT_SYMBOL(boot_cpu_data);
  #endif
  
  
  #if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
  unsigned long mmu_cr4_features;
  #else
  unsigned long mmu_cr4_features = X86_CR4_PAE;
  #endif

  /* Boot loader ID and version as integers, for the benefit of proc_dointvec */
  int bootloader_type, bootloader_version;

  /*
   * Setup options
   */

  struct screen_info screen_info;

  EXPORT_SYMBOL(screen_info);

  struct edid_info edid_info;

  EXPORT_SYMBOL_GPL(edid_info);

  extern int root_mountflags;

  unsigned long saved_video_mode;

  #define RAMDISK_IMAGE_START_MASK	0x07FF

  #define RAMDISK_PROMPT_FLAG		0x8000

  #define RAMDISK_LOAD_FLAG		0x4000

  static char __initdata command_line[COMMAND_LINE_SIZE];

  #ifdef CONFIG_CMDLINE_BOOL
  static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
  #endif

  #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 __init copy_edd(void)

  {

       memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
  	    sizeof(edd.mbr_signature));
       memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
       edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
       edd.edd_info_nr = boot_params.eddbuf_entries;

  }
  #else

  static inline void __init copy_edd(void)

  {
  }
  #endif

  void * __init extend_brk(size_t size, size_t align)
  {
  	size_t mask = align - 1;
  	void *ret;
  
  	BUG_ON(_brk_start == 0);
  	BUG_ON(align & mask);
  
  	_brk_end = (_brk_end + mask) & ~mask;
  	BUG_ON((char *)(_brk_end + size) > __brk_limit);
  
  	ret = (void *)_brk_end;
  	_brk_end += size;
  
  	memset(ret, 0, size);
  
  	return ret;
  }

  #ifdef CONFIG_X86_64
  static void __init init_gbpages(void)
  {
  	if (direct_gbpages && cpu_has_gbpages)
  		printk(KERN_INFO "Using GB pages for direct mapping
  ");
  	else
  		direct_gbpages = 0;
  }
  #else
  static inline void init_gbpages(void)
  {
  }

  static void __init cleanup_highmap(void)

  {
  }

  #endif

  static void __init reserve_brk(void)
  {
  	if (_brk_end > _brk_start)

  		memblock_reserve(__pa(_brk_start),
  				 __pa(_brk_end) - __pa(_brk_start));

  
  	/* Mark brk area as locked down and no longer taking any
  	   new allocations */
  	_brk_start = 0;
  }

  #ifdef CONFIG_BLK_DEV_INITRD

  #define MAX_MAP_CHUNK	(NR_FIX_BTMAPS << PAGE_SHIFT)
  static void __init relocate_initrd(void)

  {

  	/* Assume only end is not page aligned */

  	u64 ramdisk_image = boot_params.hdr.ramdisk_image;
  	u64 ramdisk_size  = boot_params.hdr.ramdisk_size;

  	u64 area_size     = PAGE_ALIGN(ramdisk_size);

  	u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;

  	u64 ramdisk_here;

  	unsigned long slop, clen, mapaddr;
  	char *p, *q;

  
  	/* We need to move the initrd down into lowmem */

  	ramdisk_here = memblock_find_in_range(0, end_of_lowmem, area_size,

  					 PAGE_SIZE);

  	if (!ramdisk_here)

  		panic("Cannot find place for new RAMDISK of size %lld
  ",
  			 ramdisk_size);

  	/* Note: this includes all the lowmem currently occupied by
  	   the initrd, we rely on that fact to keep the data intact. */

  	memblock_reserve(ramdisk_here, area_size);

  	initrd_start = ramdisk_here + PAGE_OFFSET;
  	initrd_end   = initrd_start + ramdisk_size;

  	printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx
  ",
  			 ramdisk_here, ramdisk_here + ramdisk_size);

  	q = (char *)initrd_start;
  
  	/* Copy any lowmem portion of the initrd */
  	if (ramdisk_image < end_of_lowmem) {
  		clen = end_of_lowmem - ramdisk_image;
  		p = (char *)__va(ramdisk_image);
  		memcpy(q, p, clen);
  		q += clen;
  		ramdisk_image += clen;
  		ramdisk_size  -= clen;
  	}
  
  	/* Copy the highmem portion of the initrd */
  	while (ramdisk_size) {
  		slop = ramdisk_image & ~PAGE_MASK;
  		clen = ramdisk_size;
  		if (clen > MAX_MAP_CHUNK-slop)
  			clen = MAX_MAP_CHUNK-slop;
  		mapaddr = ramdisk_image & PAGE_MASK;

  		p = early_memremap(mapaddr, clen+slop);

  		memcpy(q, p+slop, clen);

  		early_iounmap(p, clen+slop);

  		q += clen;
  		ramdisk_image += clen;
  		ramdisk_size  -= clen;
  	}

  	/* high pages is not converted by early_res_to_bootmem */

  	ramdisk_image = boot_params.hdr.ramdisk_image;
  	ramdisk_size  = boot_params.hdr.ramdisk_size;

  	printk(KERN_INFO "Move RAMDISK from %016llx - %016llx to"
  		" %08llx - %08llx
  ",

  		ramdisk_image, ramdisk_image + ramdisk_size - 1,
  		ramdisk_here, ramdisk_here + ramdisk_size - 1);

  }

  static void __init reserve_initrd(void)
  {

  	/* 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);

  	u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;

  
  	if (!boot_params.hdr.type_of_loader ||
  	    !ramdisk_image || !ramdisk_size)
  		return;		/* No initrd provided by bootloader */
  
  	initrd_start = 0;
  
  	if (ramdisk_size >= (end_of_lowmem>>1)) {

  		memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);

  		printk(KERN_ERR "initrd too large to handle, "
  		       "disabling initrd
  ");
  		return;
  	}
  
  	printk(KERN_INFO "RAMDISK: %08llx - %08llx
  ", ramdisk_image,
  			ramdisk_end);
  
  
  	if (ramdisk_end <= end_of_lowmem) {
  		/* All in lowmem, easy case */
  		/*
  		 * don't need to reserve again, already reserved early
  		 * in i386_start_kernel
  		 */
  		initrd_start = ramdisk_image + PAGE_OFFSET;
  		initrd_end = initrd_start + ramdisk_size;
  		return;
  	}

  	relocate_initrd();

  	memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);

  }

  #else

  static void __init reserve_initrd(void)

  {
  }

  #endif /* CONFIG_BLK_DEV_INITRD */

  static void __init parse_setup_data(void)

  {
  	struct setup_data *data;
  	u64 pa_data;
  
  	if (boot_params.hdr.version < 0x0209)
  		return;
  	pa_data = boot_params.hdr.setup_data;
  	while (pa_data) {

  		u32 data_len, map_len;
  
  		map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
  			      (u64)sizeof(struct setup_data));
  		data = early_memremap(pa_data, map_len);
  		data_len = data->len + sizeof(struct setup_data);
  		if (data_len > map_len) {
  			early_iounmap(data, map_len);
  			data = early_memremap(pa_data, data_len);
  			map_len = data_len;
  		}

  		switch (data->type) {
  		case SETUP_E820_EXT:

  			parse_e820_ext(data);

  			break;

  		case SETUP_DTB:
  			add_dtb(pa_data);

  			break;
  		default:
  			break;
  		}

  		pa_data = data->next;

  		early_iounmap(data, map_len);

  	}
  }

  static void __init e820_reserve_setup_data(void)

  {
  	struct setup_data *data;
  	u64 pa_data;

  	int found = 0;

  
  	if (boot_params.hdr.version < 0x0209)
  		return;
  	pa_data = boot_params.hdr.setup_data;
  	while (pa_data) {

  		data = early_memremap(pa_data, sizeof(*data));

  		e820_update_range(pa_data, sizeof(*data)+data->len,
  			 E820_RAM, E820_RESERVED_KERN);

  		found = 1;

  		pa_data = data->next;
  		early_iounmap(data, sizeof(*data));
  	}

  	if (!found)
  		return;

  	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);

  	memcpy(&e820_saved, &e820, sizeof(struct e820map));

  	printk(KERN_INFO "extended physical RAM map:
  ");
  	e820_print_map("reserve setup_data");
  }

  static void __init memblock_x86_reserve_range_setup_data(void)

  {
  	struct setup_data *data;
  	u64 pa_data;

  
  	if (boot_params.hdr.version < 0x0209)
  		return;
  	pa_data = boot_params.hdr.setup_data;
  	while (pa_data) {

  		data = early_memremap(pa_data, sizeof(*data));

  		memblock_reserve(pa_data, sizeof(*data) + data->len);

  		pa_data = data->next;
  		early_iounmap(data, sizeof(*data));
  	}
  }

  /*

   * --------- Crashkernel reservation ------------------------------
   */
  
  #ifdef CONFIG_KEXEC

  static inline unsigned long long get_total_mem(void)
  {
  	unsigned long long total;

  	total = max_pfn - min_low_pfn;

  
  	return total << PAGE_SHIFT;
  }

  /*
   * Keep the crash kernel below this limit.  On 32 bits earlier kernels
   * would limit the kernel to the low 512 MiB due to mapping restrictions.
   * On 64 bits, kexec-tools currently limits us to 896 MiB; increase this
   * limit once kexec-tools are fixed.
   */
  #ifdef CONFIG_X86_32
  # define CRASH_KERNEL_ADDR_MAX	(512 << 20)
  #else
  # define CRASH_KERNEL_ADDR_MAX	(896 << 20)
  #endif

  static void __init reserve_crashkernel(void)

  {
  	unsigned long long total_mem;
  	unsigned long long crash_size, crash_base;
  	int ret;
  
  	total_mem = get_total_mem();
  
  	ret = parse_crashkernel(boot_command_line, total_mem,
  			&crash_size, &crash_base);

  	if (ret != 0 || crash_size <= 0)
  		return;
  
  	/* 0 means: find the address automatically */
  	if (crash_base <= 0) {

  		const unsigned long long alignment = 16<<20;	/* 16M */

  		/*

  		 *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX

  		 */
  		crash_base = memblock_find_in_range(alignment,

  			       CRASH_KERNEL_ADDR_MAX, crash_size, alignment);

  		if (!crash_base) {

  			pr_info("crashkernel reservation failed - No suitable area found.
  ");

  			return;
  		}

  	} else {

  		unsigned long long start;

  		start = memblock_find_in_range(crash_base,
  				 crash_base + crash_size, crash_size, 1<<20);

  		if (start != crash_base) {
  			pr_info("crashkernel reservation failed - memory is in use.
  ");

  			return;
  		}

  	}

  	memblock_reserve(crash_base, crash_size);

  	printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
  			"for crashkernel (System RAM: %ldMB)
  ",
  			(unsigned long)(crash_size >> 20),
  			(unsigned long)(crash_base >> 20),
  			(unsigned long)(total_mem >> 20));

  	crashk_res.start = crash_base;
  	crashk_res.end   = crash_base + crash_size - 1;
  	insert_resource(&iomem_resource, &crashk_res);

  }
  #else

  static void __init reserve_crashkernel(void)

  {
  }
  #endif

  static struct resource standard_io_resources[] = {
  	{ .name = "dma1", .start = 0x00, .end = 0x1f,
  		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
  	{ .name = "pic1", .start = 0x20, .end = 0x21,
  		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
  	{ .name = "timer0", .start = 0x40, .end = 0x43,
  		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
  	{ .name = "timer1", .start = 0x50, .end = 0x53,
  		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
  	{ .name = "keyboard", .start = 0x60, .end = 0x60,
  		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
  	{ .name = "keyboard", .start = 0x64, .end = 0x64,
  		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
  	{ .name = "dma page reg", .start = 0x80, .end = 0x8f,
  		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
  	{ .name = "pic2", .start = 0xa0, .end = 0xa1,
  		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
  	{ .name = "dma2", .start = 0xc0, .end = 0xdf,
  		.flags = IORESOURCE_BUSY | IORESOURCE_IO },
  	{ .name = "fpu", .start = 0xf0, .end = 0xff,
  		.flags = IORESOURCE_BUSY | IORESOURCE_IO }
  };

  void __init reserve_standard_io_resources(void)

  {
  	int i;
  
  	/* request I/O space for devices used on all i[345]86 PCs */
  	for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
  		request_resource(&ioport_resource, &standard_io_resources[i]);
  
  }

  static __init void reserve_ibft_region(void)
  {
  	unsigned long addr, size = 0;
  
  	addr = find_ibft_region(&size);
  
  	if (size)

  		memblock_reserve(addr, size);

  }

  static unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;

  static void __init trim_bios_range(void)
  {
  	/*
  	 * A special case is the first 4Kb of memory;
  	 * This is a BIOS owned area, not kernel ram, but generally
  	 * not listed as such in the E820 table.

  	 *
  	 * This typically reserves additional memory (64KiB by default)
  	 * since some BIOSes are known to corrupt low memory.  See the

  	 * Kconfig help text for X86_RESERVE_LOW.

  	 */

  	e820_update_range(0, ALIGN(reserve_low, PAGE_SIZE),

  			  E820_RAM, E820_RESERVED);

  	/*
  	 * special case: Some BIOSen report the PC BIOS
  	 * area (640->1Mb) as ram even though it is not.
  	 * take them out.
  	 */
  	e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
  	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
  }

  static int __init parse_reservelow(char *p)
  {
  	unsigned long long size;
  
  	if (!p)
  		return -EINVAL;
  
  	size = memparse(p, &p);
  
  	if (size < 4096)
  		size = 4096;
  
  	if (size > 640*1024)
  		size = 640*1024;
  
  	reserve_low = size;
  
  	return 0;
  }
  
  early_param("reservelow", parse_reservelow);

  /*

   * 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.
   */

  /*
   * setup_arch - architecture-specific boot-time initializations
   *
   * Note: On x86_64, fixmaps are ready for use even before this is called.
   */

  void __init setup_arch(char **cmdline_p)
  {

  #ifdef CONFIG_X86_32

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

  	visws_early_detect();

  
  	/*
  	 * copy kernel address range established so far and switch
  	 * to the proper swapper page table
  	 */
  	clone_pgd_range(swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
  			initial_page_table + KERNEL_PGD_BOUNDARY,
  			KERNEL_PGD_PTRS);
  
  	load_cr3(swapper_pg_dir);
  	__flush_tlb_all();

  #else
  	printk(KERN_INFO "Command line: %s
  ", boot_command_line);
  #endif

  	/*
  	 * If we have OLPC OFW, we might end up relocating the fixmap due to
  	 * reserve_top(), so do this before touching the ioremap area.
  	 */

  	olpc_ofw_detect();

  	early_trap_init();

  	early_cpu_init();

  	early_ioremap_init();

  	setup_olpc_ofw_pgd();

  	ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
  	screen_info = boot_params.screen_info;
  	edid_info = boot_params.edid_info;

  #ifdef CONFIG_X86_32

  	apm_info.bios = boot_params.apm_bios_info;
  	ist_info = boot_params.ist_info;

  	if (boot_params.sys_desc_table.length != 0) {

  		set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
  		machine_id = boot_params.sys_desc_table.table[0];
  		machine_submodel_id = boot_params.sys_desc_table.table[1];
  		BIOS_revision = boot_params.sys_desc_table.table[2];

  	}

  #endif
  	saved_video_mode = boot_params.hdr.vid_mode;

  	bootloader_type = boot_params.hdr.type_of_loader;

  	if ((bootloader_type >> 4) == 0xe) {
  		bootloader_type &= 0xf;
  		bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
  	}
  	bootloader_version  = bootloader_type & 0xf;
  	bootloader_version |= boot_params.hdr.ext_loader_ver << 4;

  
  #ifdef CONFIG_BLK_DEV_RAM

  	rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
  	rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
  	rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);

  #endif

  #ifdef CONFIG_EFI
  	if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,

  		     EFI_LOADER_SIGNATURE, 4)) {

  		efi_enabled = 1;

  		efi_memblock_x86_reserve_range();

  	}
  #endif

  	x86_init.oem.arch_setup();

  	iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;

  	setup_memory_map();

  	parse_setup_data();

  	/* update the e820_saved too */
  	e820_reserve_setup_data();

  	copy_edd();

  	if (!boot_params.hdr.root_flags)

  		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 = _brk_end;

  
  	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;

  	bss_resource.start = virt_to_phys(&__bss_start);
  	bss_resource.end = virt_to_phys(&__bss_stop)-1;

  #ifdef CONFIG_CMDLINE_BOOL
  #ifdef CONFIG_CMDLINE_OVERRIDE
  	strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
  #else
  	if (builtin_cmdline[0]) {
  		/* append boot loader cmdline to builtin */
  		strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
  		strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
  		strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
  	}
  #endif
  #endif

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

  	/*

  	 * x86_configure_nx() is called before parse_early_param() to detect
  	 * whether hardware doesn't support NX (so that the early EHCI debug
  	 * console setup can safely call set_fixmap()). It may then be called
  	 * again from within noexec_setup() during parsing early parameters
  	 * to honor the respective command line option.

  	 */

  	x86_configure_nx();

  
  	parse_early_param();

  	x86_report_nx();

  	/* after early param, so could get panic from serial */

  	memblock_x86_reserve_range_setup_data();

  	if (acpi_mps_check()) {

  #ifdef CONFIG_X86_LOCAL_APIC

  		disable_apic = 1;
  #endif

  		setup_clear_cpu_cap(X86_FEATURE_APIC);

  	}

  #ifdef CONFIG_PCI
  	if (pci_early_dump_regs)
  		early_dump_pci_devices();
  #endif

  	finish_e820_parsing();

  	if (efi_enabled)
  		efi_init();

  	dmi_scan_machine();

  	/*
  	 * VMware detection requires dmi to be available, so this
  	 * needs to be done after dmi_scan_machine, for the BP.
  	 */

  	init_hypervisor_platform();

  	x86_init.resources.probe_roms();

  
  	/* after parse_early_param, so could debug it */
  	insert_resource(&iomem_resource, &code_resource);
  	insert_resource(&iomem_resource, &data_resource);
  	insert_resource(&iomem_resource, &bss_resource);

  	trim_bios_range();

  #ifdef CONFIG_X86_32

  	if (ppro_with_ram_bug()) {
  		e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
  				  E820_RESERVED);
  		sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
  		printk(KERN_INFO "fixed physical RAM map:
  ");
  		e820_print_map("bad_ppro");
  	}

  #else
  	early_gart_iommu_check();
  #endif

  	/*
  	 * partially used pages are not usable - thus
  	 * we are rounding upwards:
  	 */

  	max_pfn = e820_end_of_ram_pfn();

  	/* update e820 for memory not covered by WB MTRRs */
  	mtrr_bp_init();

  	if (mtrr_trim_uncached_memory(max_pfn))

  		max_pfn = e820_end_of_ram_pfn();

  #ifdef CONFIG_X86_32

  	/* max_low_pfn get updated here */

  	find_low_pfn_range();

  #else
  	num_physpages = max_pfn;

  	check_x2apic();

  
  	/* How many end-of-memory variables you have, grandma! */
  	/* need this before calling reserve_initrd */

  	if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
  		max_low_pfn = e820_end_of_low_ram_pfn();
  	else
  		max_low_pfn = max_pfn;

  	high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;

  #endif

  	/*
  	 * Find and reserve possible boot-time SMP configuration:
  	 */
  	find_smp_config();

  	reserve_ibft_region();

  	/*
  	 * Need to conclude brk, before memblock_x86_fill()
  	 *  it could use memblock_find_in_range, could overlap with
  	 *  brk area.
  	 */
  	reserve_brk();

  	cleanup_highmap();

  	memblock.current_limit = get_max_mapped();
  	memblock_x86_fill();

  	/*
  	 * The EFI specification says that boot service code won't be called
  	 * after ExitBootServices(). This is, in fact, a lie.
  	 */
  	if (efi_enabled)
  		efi_reserve_boot_services();

  	/* preallocate 4k for mptable mpc */
  	early_reserve_e820_mpc_new();
  
  #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
  	setup_bios_corruption_check();
  #endif
  
  	printk(KERN_DEBUG "initial memory mapped : 0 - %08lx
  ",
  			max_pfn_mapped<<PAGE_SHIFT);

  	setup_trampolines();

  	init_gbpages();

  	/* max_pfn_mapped is updated here */

  	max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
  	max_pfn_mapped = max_low_pfn_mapped;

  #ifdef CONFIG_X86_64
  	if (max_pfn > max_low_pfn) {
  		max_pfn_mapped = init_memory_mapping(1UL<<32,
  						     max_pfn<<PAGE_SHIFT);
  		/* can we preseve max_low_pfn ?*/
  		max_low_pfn = max_pfn;
  	}
  #endif

  	memblock.current_limit = get_max_mapped();

  	/*
  	 * NOTE: On x86-32, only from this point on, fixmaps are ready for use.
  	 */
  
  #ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
  	if (init_ohci1394_dma_early)
  		init_ohci1394_dma_on_all_controllers();
  #endif

  	/* Allocate bigger log buffer */
  	setup_log_buf(1);

  	reserve_initrd();

  	reserve_crashkernel();

  	vsmp_init();

  	io_delay_init();

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

  	early_acpi_boot_init();

  	initmem_init();

  	memblock_find_dma_reserve();

  #ifdef CONFIG_KVM_CLOCK
  	kvmclock_init();
  #endif

  	x86_init.paging.pagetable_setup_start(swapper_pg_dir);

  	paging_init();

  	x86_init.paging.pagetable_setup_done(swapper_pg_dir);

  	if (boot_cpu_data.cpuid_level >= 0) {
  		/* A CPU has %cr4 if and only if it has CPUID */
  		mmu_cr4_features = read_cr4();
  	}

  #ifdef CONFIG_X86_32
  	/* sync back kernel address range */
  	clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
  			swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
  			KERNEL_PGD_PTRS);
  #endif

  	tboot_probe();

  #ifdef CONFIG_X86_64
  	map_vsyscall();
  #endif

  	generic_apic_probe();

  	early_quirks();

  	/*
  	 * Read APIC and some other early information from ACPI tables.
  	 */

  	acpi_boot_init();

  	sfi_init();

  	x86_dtb_init();

  	/*
  	 * get boot-time SMP configuration:
  	 */

  	if (smp_found_config)
  		get_smp_config();

  	prefill_possible_map();

  	init_cpu_to_node();

  	init_apic_mappings();

  	ioapic_and_gsi_init();

  	kvm_guest_init();

  	e820_reserve_resources();

  	e820_mark_nosave_regions(max_low_pfn);

  	x86_init.resources.reserve_resources();

  
  	e820_setup_gap();

  #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

  	x86_init.oem.banner();

  	x86_init.timers.wallclock_init();

  	x86_platform.wallclock_init();

  	mcheck_init();

  	arch_init_ideal_nops();

  }

  #ifdef CONFIG_X86_32

  static struct resource video_ram_resource = {
  	.name	= "Video RAM area",
  	.start	= 0xa0000,
  	.end	= 0xbffff,
  	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM

  };

  void __init i386_reserve_resources(void)

  {

  	request_resource(&iomem_resource, &video_ram_resource);
  	reserve_standard_io_resources();

  }

  #endif /* CONFIG_X86_32 */