x86: add extension fields for bootloader type and version

[mirror_ubuntu-zesty-kernel.git] / arch / x86 / 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/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/slab.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 <video/edid.h>

#include <asm/mtrr.h>
#include <asm/apic.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/vmi.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/percpu.h>
#include <asm/topology.h>
#include <asm/apicdef.h>
#ifdef CONFIG_X86_64
#include <asm/numa_64.h>
#endif

#ifndef ARCH_SETUP
#define ARCH_SETUP
#endif

RESERVE_BRK(dmi_alloc, 65536);

unsigned int boot_cpu_id __read_mostly;

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 boot_cpu_physical_apicid)
{
        return __default_check_phys_apicid_present(boot_cpu_physical_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
static struct resource video_ram_resource = {
        .name   = "Video RAM area",
        .start  = 0xa0000,
        .end    = 0xbffff,
        .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
};

/* 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 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 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;
}

static void __init reserve_brk(void)
{
        if (_brk_end > _brk_start)
                reserve_early(__pa(_brk_start), __pa(_brk_end), "BRK");

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

#ifdef CONFIG_BLK_DEV_INITRD

#ifdef CONFIG_X86_32

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

        u64 ramdisk_image = boot_params.hdr.ramdisk_image;
        u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
        u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
        u64 ramdisk_here;
        unsigned long slop, clen, mapaddr;
        char *p, *q;

        /* We need to move the initrd down into lowmem */
        ramdisk_here = find_e820_area(0, end_of_lowmem, ramdisk_size,
                                         PAGE_SIZE);

        if (ramdisk_here == -1ULL)
                panic("Cannot find place for new RAMDISK of size %lld\n",
                         ramdisk_size);

        /* Note: this includes all the lowmem currently occupied by
           the initrd, we rely on that fact to keep the data intact. */
        reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
                         "NEW RAMDISK");
        initrd_start = ramdisk_here + PAGE_OFFSET;
        initrd_end   = initrd_start + ramdisk_size;
        printk(KERN_INFO "Allocated new RAMDISK: %08llx - %08llx\n",
                         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\n",
                ramdisk_image, ramdisk_image + ramdisk_size - 1,
                ramdisk_here, ramdisk_here + ramdisk_size - 1);
}
#endif

static void __init reserve_initrd(void)
{
        u64 ramdisk_image = boot_params.hdr.ramdisk_image;
        u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
        u64 ramdisk_end   = ramdisk_image + ramdisk_size;
        u64 end_of_lowmem = max_low_pfn << 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)) {
                free_early(ramdisk_image, ramdisk_end);
                printk(KERN_ERR "initrd too large to handle, "
                       "disabling initrd\n");
                return;
        }

        printk(KERN_INFO "RAMDISK: %08llx - %08llx\n", 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;
        }

#ifdef CONFIG_X86_32
        relocate_initrd();
#else
        printk(KERN_ERR "initrd extends beyond end of memory "
               "(0x%08llx > 0x%08llx)\ndisabling initrd\n",
               ramdisk_end, end_of_lowmem);
        initrd_start = 0;
#endif
        free_early(ramdisk_image, ramdisk_end);
}
#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) {
                data = early_memremap(pa_data, PAGE_SIZE);
                switch (data->type) {
                case SETUP_E820_EXT:
                        parse_e820_ext(data, pa_data);
                        break;
                default:
                        break;
                }
                pa_data = data->next;
                early_iounmap(data, PAGE_SIZE);
        }
}

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:\n");
        e820_print_map("reserve setup_data");
}

static void __init reserve_early_setup_data(void)
{
        struct setup_data *data;
        u64 pa_data;
        char buf[32];

        if (boot_params.hdr.version < 0x0209)
                return;
        pa_data = boot_params.hdr.setup_data;
        while (pa_data) {
                data = early_memremap(pa_data, sizeof(*data));
                sprintf(buf, "setup data %x", data->type);
                reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
                pa_data = data->next;
                early_iounmap(data, sizeof(*data));
        }
}

/*
 * --------- Crashkernel reservation ------------------------------
 */

#ifdef CONFIG_KEXEC

/**
 * Reserve @size bytes of crashkernel memory at any suitable offset.
 *
 * @size: Size of the crashkernel memory to reserve.
 * Returns the base address on success, and -1ULL on failure.
 */
static
unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
{
        const unsigned long long alignment = 16<<20;    /* 16M */
        unsigned long long start = 0LL;

        while (1) {
                int ret;

                start = find_e820_area(start, ULONG_MAX, size, alignment);
                if (start == -1ULL)
                        return start;

                /* try to reserve it */
                ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
                if (ret >= 0)
                        return start;

                start += alignment;
        }
}

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

        total = max_low_pfn - min_low_pfn;
#ifdef CONFIG_HIGHMEM
        total += highend_pfn - highstart_pfn;
#endif

        return total << PAGE_SHIFT;
}

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) {
                crash_base = find_and_reserve_crashkernel(crash_size);
                if (crash_base == -1ULL) {
                        pr_info("crashkernel reservation failed. "
                                "No suitable area found.\n");
                        return;
                }
        } else {
                ret = reserve_bootmem_generic(crash_base, crash_size,
                                        BOOTMEM_EXCLUSIVE);
                if (ret < 0) {
                        pr_info("crashkernel reservation failed - "
                                "memory is in use\n");
                        return;
                }
        }

        printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
                        "for crashkernel (System RAM: %ldMB)\n",
                        (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 }
};

static 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]);

}

/*
 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 * is_kdump_kernel() to determine if we are booting after a panic. Hence
 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 */

#ifdef CONFIG_CRASH_DUMP
/* elfcorehdr= specifies the location of elf core header
 * stored by the crashed kernel. This option will be passed
 * by kexec loader to the capture kernel.
 */
static int __init setup_elfcorehdr(char *arg)
{
        char *end;
        if (!arg)
                return -EINVAL;
        elfcorehdr_addr = memparse(arg, &end);
        return end > arg ? 0 : -EINVAL;
}
early_param("elfcorehdr", setup_elfcorehdr);
#endif

static struct x86_quirks default_x86_quirks __initdata;

struct x86_quirks *x86_quirks __initdata = &default_x86_quirks;

#ifdef CONFIG_X86_RESERVE_LOW_64K
static int __init dmi_low_memory_corruption(const struct dmi_system_id *d)
{
        printk(KERN_NOTICE
                "%s detected: BIOS may corrupt low RAM, working around it.\n",
                d->ident);

        e820_update_range(0, 0x10000, E820_RAM, E820_RESERVED);
        sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);

        return 0;
}
#endif

/* List of systems that have known low memory corruption BIOS problems */
static struct dmi_system_id __initdata bad_bios_dmi_table[] = {
#ifdef CONFIG_X86_RESERVE_LOW_64K
        {
                .callback = dmi_low_memory_corruption,
                .ident = "AMI BIOS",
                .matches = {
                        DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
                },
        },
        {
                .callback = dmi_low_memory_corruption,
                .ident = "Phoenix BIOS",
                .matches = {
                        DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies"),
                },
        },
#endif
        {}
};

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

        /* VMI may relocate the fixmap; do this before touching ioremap area */
        vmi_init();

        early_cpu_init();
        early_ioremap_init();

        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,
#ifdef CONFIG_X86_32
                     "EL32",
#else
                     "EL64",
#endif
         4)) {
                efi_enabled = 1;
                efi_reserve_early();
        }
#endif

        ARCH_SETUP

        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;

        parse_early_param();

#ifdef CONFIG_X86_64
        check_efer();
#endif

        /* Must be before kernel pagetables are setup */
        vmi_activate();

        /* after early param, so could get panic from serial */
        reserve_early_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();

        dmi_check_system(bad_bios_dmi_table);

        /*
         * VMware detection requires dmi to be available, so this
         * needs to be done after dmi_scan_machine, for the BP.
         */
        init_hypervisor(&boot_cpu_data);

#ifdef CONFIG_X86_32
        probe_roms();
#endif

        /* 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);


#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:\n");
                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();

        /* preallocate 4k for mptable mpc */
        early_reserve_e820_mpc_new();
        /* 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

#ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
        setup_bios_corruption_check();
#endif

        reserve_brk();

        /* 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

        /*
         * 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

        reserve_initrd();

        vsmp_init();

        io_delay_init();

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

        early_acpi_boot_init();

#ifdef CONFIG_ACPI_NUMA
        /*
         * Parse SRAT to discover nodes.
         */
        acpi_numa_init();
#endif

        initmem_init(0, max_pfn);

#ifdef CONFIG_ACPI_SLEEP
        /*
         * Reserve low memory region for sleep support.
         */
        acpi_reserve_bootmem();
#endif
        /*
         * Find and reserve possible boot-time SMP configuration:
         */
        find_smp_config();

        reserve_crashkernel();

#ifdef CONFIG_X86_64
        /*
         * dma32_reserve_bootmem() allocates bootmem which may conflict
         * with the crashkernel command line, so do that after
         * reserve_crashkernel()
         */
        dma32_reserve_bootmem();
#endif

        reserve_ibft_region();

#ifdef CONFIG_KVM_CLOCK
        kvmclock_init();
#endif

        paravirt_pagetable_setup_start(swapper_pg_dir);
        paging_init();
        paravirt_pagetable_setup_done(swapper_pg_dir);
        paravirt_post_allocator_init();

#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();

#if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS)
        /*
         * get boot-time SMP configuration:
         */
        if (smp_found_config)
                get_smp_config();
#endif

        prefill_possible_map();

#ifdef CONFIG_X86_64
        init_cpu_to_node();
#endif

        init_apic_mappings();
        ioapic_init_mappings();

        /* need to wait for io_apic is mapped */
        probe_nr_irqs_gsi();

        kvm_guest_init();

        e820_reserve_resources();
        e820_mark_nosave_regions(max_low_pfn);

#ifdef CONFIG_X86_32
        request_resource(&iomem_resource, &video_ram_resource);
#endif
        reserve_standard_io_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
}

#ifdef CONFIG_X86_32

/**
 * x86_quirk_pre_intr_init - initialisation prior to setting up interrupt vectors
 *
 * Description:
 *      Perform any necessary interrupt initialisation prior to setting up
 *      the "ordinary" interrupt call gates.  For legacy reasons, the ISA
 *      interrupts should be initialised here if the machine emulates a PC
 *      in any way.
 **/
void __init x86_quirk_pre_intr_init(void)
{
        if (x86_quirks->arch_pre_intr_init) {
                if (x86_quirks->arch_pre_intr_init())
                        return;
        }
        init_ISA_irqs();
}

/**
 * x86_quirk_intr_init - post gate setup interrupt initialisation
 *
 * Description:
 *      Fill in any interrupts that may have been left out by the general
 *      init_IRQ() routine.  interrupts having to do with the machine rather
 *      than the devices on the I/O bus (like APIC interrupts in intel MP
 *      systems) are started here.
 **/
void __init x86_quirk_intr_init(void)
{
        if (x86_quirks->arch_intr_init) {
                if (x86_quirks->arch_intr_init())
                        return;
        }
}

/**
 * x86_quirk_trap_init - initialise system specific traps
 *
 * Description:
 *      Called as the final act of trap_init().  Used in VISWS to initialise
 *      the various board specific APIC traps.
 **/
void __init x86_quirk_trap_init(void)
{
        if (x86_quirks->arch_trap_init) {
                if (x86_quirks->arch_trap_init())
                        return;
        }
}

static struct irqaction irq0  = {
        .handler = timer_interrupt,
        .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
        .name = "timer"
};

/**
 * x86_quirk_pre_time_init - do any specific initialisations before.
 *
 **/
void __init x86_quirk_pre_time_init(void)
{
        if (x86_quirks->arch_pre_time_init)
                x86_quirks->arch_pre_time_init();
}

/**
 * x86_quirk_time_init - do any specific initialisations for the system timer.
 *
 * Description:
 *      Must plug the system timer interrupt source at HZ into the IRQ listed
 *      in irq_vectors.h:TIMER_IRQ
 **/
void __init x86_quirk_time_init(void)
{
        if (x86_quirks->arch_time_init) {
                /*
                 * A nonzero return code does not mean failure, it means
                 * that the architecture quirk does not want any
                 * generic (timer) setup to be performed after this:
                 */
                if (x86_quirks->arch_time_init())
                        return;
        }

        irq0.mask = cpumask_of_cpu(0);
        setup_irq(0, &irq0);
}
#endif /* CONFIG_X86_32 */