[mirror_ubuntu-kernels.git] / arch / x86 / kernel / setup_64.c

/*
 *  Copyright (C) 1995  Linus Torvalds
 */

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

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/screen_info.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/highmem.h>
#include <linux/bootmem.h>
#include <linux/module.h>
#include <asm/processor.h>
#include <linux/console.h>
#include <linux/seq_file.h>
#include <linux/crash_dump.h>
#include <linux/root_dev.h>
#include <linux/pci.h>
#include <linux/efi.h>
#include <linux/acpi.h>
#include <linux/kallsyms.h>
#include <linux/edd.h>
#include <linux/mmzone.h>
#include <linux/kexec.h>
#include <linux/cpufreq.h>
#include <linux/dmi.h>
#include <linux/dma-mapping.h>
#include <linux/ctype.h>
#include <linux/uaccess.h>
#include <linux/init_ohci1394_dma.h>

#include <asm/mtrr.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/vsyscall.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/msr.h>
#include <asm/desc.h>
#include <video/edid.h>
#include <asm/e820.h>
#include <asm/dma.h>
#include <asm/gart.h>
#include <asm/mpspec.h>
#include <asm/mmu_context.h>
#include <asm/proto.h>
#include <asm/setup.h>
#include <asm/mach_apic.h>
#include <asm/numa.h>
#include <asm/sections.h>
#include <asm/dmi.h>
#include <asm/cacheflush.h>
#include <asm/mce.h>
#include <asm/ds.h>
#include <asm/topology.h>

#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else
#define ARCH_SETUP
#endif

/*
 * Machine setup..
 */

struct cpuinfo_x86 boot_cpu_data __read_mostly;
EXPORT_SYMBOL(boot_cpu_data);

__u32 cleared_cpu_caps[NCAPINTS] __cpuinitdata;

unsigned long mmu_cr4_features;

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

unsigned long saved_video_mode;

int force_mwait __cpuinitdata;

/*
 * Early DMI memory
 */
int dmi_alloc_index;
char dmi_alloc_data[DMI_MAX_DATA];

/*
 * Setup options
 */
struct screen_info screen_info;
EXPORT_SYMBOL(screen_info);
struct sys_desc_table_struct {
        unsigned short length;
        unsigned char table[0];
};

struct edid_info edid_info;
EXPORT_SYMBOL_GPL(edid_info);

extern int root_mountflags;

char __initdata command_line[COMMAND_LINE_SIZE];

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 = 0x6f,
                .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 }
};

#define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)

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

static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c);

#ifdef CONFIG_PROC_VMCORE
/* 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

#ifndef CONFIG_NUMA
static void __init
contig_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
{
        unsigned long bootmap_size, bootmap;

        bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
        bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
                                 PAGE_SIZE);
        if (bootmap == -1L)
                panic("Cannot find bootmem map of size %ld\n", bootmap_size);
        bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
        e820_register_active_regions(0, start_pfn, end_pfn);
        free_bootmem_with_active_regions(0, end_pfn);
        reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
}
#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

#ifdef CONFIG_KEXEC
static void __init reserve_crashkernel(void)
{
        unsigned long long total_mem;
        unsigned long long crash_size, crash_base;
        int ret;

        total_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;

        ret = parse_crashkernel(boot_command_line, total_mem,
                        &crash_size, &crash_base);
        if (ret == 0 && crash_size) {
                if (crash_base <= 0) {
                        printk(KERN_INFO "crashkernel reservation failed - "
                                        "you have to specify a base address\n");
                        return;
                }

                if (reserve_bootmem(crash_base, crash_size,
                                        BOOTMEM_EXCLUSIVE) < 0) {
                        printk(KERN_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;
        }
}
#else
static inline void __init reserve_crashkernel(void)
{}
#endif

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

/*
 * 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)
{
        unsigned i;

        printk(KERN_INFO "Command line: %s\n", boot_command_line);

        ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
        screen_info = boot_params.screen_info;
        edid_info = boot_params.edid_info;
        saved_video_mode = boot_params.hdr.vid_mode;
        bootloader_type = boot_params.hdr.type_of_loader;

#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,
                     "EL64", 4))
                efi_enabled = 1;
#endif

        ARCH_SETUP

        memory_setup();
        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 = (unsigned long) &_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;

        early_identify_cpu(&boot_cpu_data);

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

        parse_early_param();

#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
        if (init_ohci1394_dma_early)
                init_ohci1394_dma_on_all_controllers();
#endif

        finish_e820_parsing();

        early_gart_iommu_check();

        e820_register_active_regions(0, 0, -1UL);
        /*
         * partially used pages are not usable - thus
         * we are rounding upwards:
         */
        end_pfn = e820_end_of_ram();
        /* update e820 for memory not covered by WB MTRRs */
        mtrr_bp_init();
        if (mtrr_trim_uncached_memory(end_pfn)) {
                e820_register_active_regions(0, 0, -1UL);
                end_pfn = e820_end_of_ram();
        }

        num_physpages = end_pfn;

        check_efer();

        init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
        if (efi_enabled)
                efi_init();

        dmi_scan_machine();

        io_delay_init();

#ifdef CONFIG_SMP
        /* setup to use the early static init tables during kernel startup */
        x86_cpu_to_apicid_early_ptr = (void *)x86_cpu_to_apicid_init;
        x86_bios_cpu_apicid_early_ptr = (void *)x86_bios_cpu_apicid_init;
#ifdef CONFIG_NUMA
        x86_cpu_to_node_map_early_ptr = (void *)x86_cpu_to_node_map_init;
#endif
#endif

#ifdef CONFIG_ACPI
        /*
         * Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
         * Call this early for SRAT node setup.
         */
        acpi_boot_table_init();
#endif

        /* How many end-of-memory variables you have, grandma! */
        max_low_pfn = end_pfn;
        max_pfn = end_pfn;
        high_memory = (void *)__va(end_pfn * PAGE_SIZE - 1) + 1;

        /* Remove active ranges so rediscovery with NUMA-awareness happens */
        remove_all_active_ranges();

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

#ifdef CONFIG_NUMA
        numa_initmem_init(0, end_pfn);
#else
        contig_initmem_init(0, end_pfn);
#endif

        early_res_to_bootmem();

        dma32_reserve_bootmem();

#ifdef CONFIG_ACPI_SLEEP
        /*
         * Reserve low memory region for sleep support.
         */
       acpi_reserve_bootmem();
#endif

        if (efi_enabled)
                efi_reserve_bootmem();

       /*
        * Find and reserve possible boot-time SMP configuration:
        */
        find_smp_config();
#ifdef CONFIG_BLK_DEV_INITRD
        if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
                unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
                unsigned long ramdisk_size  = boot_params.hdr.ramdisk_size;
                unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
                unsigned long end_of_mem    = end_pfn << PAGE_SHIFT;

                if (ramdisk_end <= end_of_mem) {
                        reserve_bootmem_generic(ramdisk_image, ramdisk_size);
                        initrd_start = ramdisk_image + PAGE_OFFSET;
                        initrd_end = initrd_start+ramdisk_size;
                } else {
                        /* Assumes everything on node 0 */
                        free_bootmem(ramdisk_image, ramdisk_size);
                        printk(KERN_ERR "initrd extends beyond end of memory "
                               "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
                               ramdisk_end, end_of_mem);
                        initrd_start = 0;
                }
        }
#endif
        reserve_crashkernel();
        paging_init();
        map_vsyscall();

        early_quirks();

#ifdef CONFIG_ACPI
        /*
         * Read APIC and some other early information from ACPI tables.
         */
        acpi_boot_init();
#endif

        init_cpu_to_node();

        /*
         * get boot-time SMP configuration:
         */
        if (smp_found_config)
                get_smp_config();
        init_apic_mappings();
        ioapic_init_mappings();

        /*
         * We trust e820 completely. No explicit ROM probing in memory.
         */
        e820_reserve_resources(&code_resource, &data_resource, &bss_resource);
        e820_mark_nosave_regions();

        /* 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]);

        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
}

static int __cpuinit get_model_name(struct cpuinfo_x86 *c)
{
        unsigned int *v;

        if (c->extended_cpuid_level < 0x80000004)
                return 0;

        v = (unsigned int *) c->x86_model_id;
        cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]);
        cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]);
        cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]);
        c->x86_model_id[48] = 0;
        return 1;
}


static void __cpuinit display_cacheinfo(struct cpuinfo_x86 *c)
{
        unsigned int n, dummy, eax, ebx, ecx, edx;

        n = c->extended_cpuid_level;

        if (n >= 0x80000005) {
                cpuid(0x80000005, &dummy, &ebx, &ecx, &edx);
                printk(KERN_INFO "CPU: L1 I Cache: %dK (%d bytes/line), "
                       "D cache %dK (%d bytes/line)\n",
                       edx>>24, edx&0xFF, ecx>>24, ecx&0xFF);
                c->x86_cache_size = (ecx>>24) + (edx>>24);
                /* On K8 L1 TLB is inclusive, so don't count it */
                c->x86_tlbsize = 0;
        }

        if (n >= 0x80000006) {
                cpuid(0x80000006, &dummy, &ebx, &ecx, &edx);
                ecx = cpuid_ecx(0x80000006);
                c->x86_cache_size = ecx >> 16;
                c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff);

                printk(KERN_INFO "CPU: L2 Cache: %dK (%d bytes/line)\n",
                c->x86_cache_size, ecx & 0xFF);
        }
        if (n >= 0x80000008) {
                cpuid(0x80000008, &eax, &dummy, &dummy, &dummy);
                c->x86_virt_bits = (eax >> 8) & 0xff;
                c->x86_phys_bits = eax & 0xff;
        }
}

#ifdef CONFIG_NUMA
static int __cpuinit nearby_node(int apicid)
{
        int i, node;

        for (i = apicid - 1; i >= 0; i--) {
                node = apicid_to_node[i];
                if (node != NUMA_NO_NODE && node_online(node))
                        return node;
        }
        for (i = apicid + 1; i < MAX_LOCAL_APIC; i++) {
                node = apicid_to_node[i];
                if (node != NUMA_NO_NODE && node_online(node))
                        return node;
        }
        return first_node(node_online_map); /* Shouldn't happen */
}
#endif

/*
 * On a AMD dual core setup the lower bits of the APIC id distingush the cores.
 * Assumes number of cores is a power of two.
 */
static void __cpuinit amd_detect_cmp(struct cpuinfo_x86 *c)
{
#ifdef CONFIG_SMP
        unsigned bits;
#ifdef CONFIG_NUMA
        int cpu = smp_processor_id();
        int node = 0;
        unsigned apicid = hard_smp_processor_id();
#endif
        bits = c->x86_coreid_bits;

        /* Low order bits define the core id (index of core in socket) */
        c->cpu_core_id = c->phys_proc_id & ((1 << bits)-1);
        /* Convert the APIC ID into the socket ID */
        c->phys_proc_id = phys_pkg_id(bits);

#ifdef CONFIG_NUMA
        node = c->phys_proc_id;
        if (apicid_to_node[apicid] != NUMA_NO_NODE)
                node = apicid_to_node[apicid];
        if (!node_online(node)) {
                /* Two possibilities here:
                   - The CPU is missing memory and no node was created.
                   In that case try picking one from a nearby CPU
                   - The APIC IDs differ from the HyperTransport node IDs
                   which the K8 northbridge parsing fills in.
                   Assume they are all increased by a constant offset,
                   but in the same order as the HT nodeids.
                   If that doesn't result in a usable node fall back to the
                   path for the previous case.  */

                int ht_nodeid = apicid - (cpu_data(0).phys_proc_id << bits);

                if (ht_nodeid >= 0 &&
                    apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
                        node = apicid_to_node[ht_nodeid];
                /* Pick a nearby node */
                if (!node_online(node))
                        node = nearby_node(apicid);
        }
        numa_set_node(cpu, node);

        printk(KERN_INFO "CPU %d/%x -> Node %d\n", cpu, apicid, node);
#endif
#endif
}

static void __cpuinit early_init_amd_mc(struct cpuinfo_x86 *c)
{
#ifdef CONFIG_SMP
        unsigned bits, ecx;

        /* Multi core CPU? */
        if (c->extended_cpuid_level < 0x80000008)
                return;

        ecx = cpuid_ecx(0x80000008);

        c->x86_max_cores = (ecx & 0xff) + 1;

        /* CPU telling us the core id bits shift? */
        bits = (ecx >> 12) & 0xF;

        /* Otherwise recompute */
        if (bits == 0) {
                while ((1 << bits) < c->x86_max_cores)
                        bits++;
        }

        c->x86_coreid_bits = bits;

#endif
}

#define ENABLE_C1E_MASK         0x18000000
#define CPUID_PROCESSOR_SIGNATURE       1
#define CPUID_XFAM              0x0ff00000
#define CPUID_XFAM_K8           0x00000000
#define CPUID_XFAM_10H          0x00100000
#define CPUID_XFAM_11H          0x00200000
#define CPUID_XMOD              0x000f0000
#define CPUID_XMOD_REV_F        0x00040000

/* AMD systems with C1E don't have a working lAPIC timer. Check for that. */
static __cpuinit int amd_apic_timer_broken(void)
{
        u32 lo, hi, eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);

        switch (eax & CPUID_XFAM) {
        case CPUID_XFAM_K8:
                if ((eax & CPUID_XMOD) < CPUID_XMOD_REV_F)
                        break;
        case CPUID_XFAM_10H:
        case CPUID_XFAM_11H:
                rdmsr(MSR_K8_ENABLE_C1E, lo, hi);
                if (lo & ENABLE_C1E_MASK)
                        return 1;
                break;
        default:
                /* err on the side of caution */
                return 1;
        }
        return 0;
}

static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
{
        early_init_amd_mc(c);

        /* c->x86_power is 8000_0007 edx. Bit 8 is constant TSC */
        if (c->x86_power & (1<<8))
                set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
}

static void __cpuinit init_amd(struct cpuinfo_x86 *c)
{
        unsigned level;

#ifdef CONFIG_SMP
        unsigned long value;

        /*
         * Disable TLB flush filter by setting HWCR.FFDIS on K8
         * bit 6 of msr C001_0015
         *
         * Errata 63 for SH-B3 steppings
         * Errata 122 for all steppings (F+ have it disabled by default)
         */
        if (c->x86 == 15) {
                rdmsrl(MSR_K8_HWCR, value);
                value |= 1 << 6;
                wrmsrl(MSR_K8_HWCR, value);
        }
#endif

        /* Bit 31 in normal CPUID used for nonstandard 3DNow ID;
           3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
        clear_bit(0*32+31, (unsigned long *)&c->x86_capability);

        /* On C+ stepping K8 rep microcode works well for copy/memset */
        level = cpuid_eax(1);
        if (c->x86 == 15 && ((level >= 0x0f48 && level < 0x0f50) ||
                             level >= 0x0f58))
                set_cpu_cap(c, X86_FEATURE_REP_GOOD);
        if (c->x86 == 0x10 || c->x86 == 0x11)
                set_cpu_cap(c, X86_FEATURE_REP_GOOD);

        /* Enable workaround for FXSAVE leak */
        if (c->x86 >= 6)
                set_cpu_cap(c, X86_FEATURE_FXSAVE_LEAK);

        level = get_model_name(c);
        if (!level) {
                switch (c->x86) {
                case 15:
                        /* Should distinguish Models here, but this is only
                           a fallback anyways. */
                        strcpy(c->x86_model_id, "Hammer");
                        break;
                }
        }
        display_cacheinfo(c);

        /* Multi core CPU? */
        if (c->extended_cpuid_level >= 0x80000008)
                amd_detect_cmp(c);

        if (c->extended_cpuid_level >= 0x80000006 &&
                (cpuid_edx(0x80000006) & 0xf000))
                num_cache_leaves = 4;
        else
                num_cache_leaves = 3;

        if (c->x86 == 0xf || c->x86 == 0x10 || c->x86 == 0x11)
                set_cpu_cap(c, X86_FEATURE_K8);

        /* MFENCE stops RDTSC speculation */
        set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC);

        if (amd_apic_timer_broken())
                disable_apic_timer = 1;
}

void __cpuinit detect_ht(struct cpuinfo_x86 *c)
{
#ifdef CONFIG_SMP
        u32 eax, ebx, ecx, edx;
        int index_msb, core_bits;

        cpuid(1, &eax, &ebx, &ecx, &edx);


        if (!cpu_has(c, X86_FEATURE_HT))
                return;
        if (cpu_has(c, X86_FEATURE_CMP_LEGACY))
                goto out;

        smp_num_siblings = (ebx & 0xff0000) >> 16;

        if (smp_num_siblings == 1) {
                printk(KERN_INFO  "CPU: Hyper-Threading is disabled\n");
        } else if (smp_num_siblings > 1) {

                if (smp_num_siblings > NR_CPUS) {
                        printk(KERN_WARNING "CPU: Unsupported number of "
                               "siblings %d", smp_num_siblings);
                        smp_num_siblings = 1;
                        return;
                }

                index_msb = get_count_order(smp_num_siblings);
                c->phys_proc_id = phys_pkg_id(index_msb);

                smp_num_siblings = smp_num_siblings / c->x86_max_cores;

                index_msb = get_count_order(smp_num_siblings);

                core_bits = get_count_order(c->x86_max_cores);

                c->cpu_core_id = phys_pkg_id(index_msb) &
                                               ((1 << core_bits) - 1);
        }
out:
        if ((c->x86_max_cores * smp_num_siblings) > 1) {
                printk(KERN_INFO  "CPU: Physical Processor ID: %d\n",
                       c->phys_proc_id);
                printk(KERN_INFO  "CPU: Processor Core ID: %d\n",
                       c->cpu_core_id);
        }

#endif
}

/*
 * find out the number of processor cores on the die
 */
static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
{
        unsigned int eax, t;

        if (c->cpuid_level < 4)
                return 1;

        cpuid_count(4, 0, &eax, &t, &t, &t);

        if (eax & 0x1f)
                return ((eax >> 26) + 1);
        else
                return 1;
}

static void __cpuinit srat_detect_node(void)
{
#ifdef CONFIG_NUMA
        unsigned node;
        int cpu = smp_processor_id();
        int apicid = hard_smp_processor_id();

        /* Don't do the funky fallback heuristics the AMD version employs
           for now. */
        node = apicid_to_node[apicid];
        if (node == NUMA_NO_NODE)
                node = first_node(node_online_map);
        numa_set_node(cpu, node);

        printk(KERN_INFO "CPU %d/%x -> Node %d\n", cpu, apicid, node);
#endif
}

static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
{
        if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
            (c->x86 == 0x6 && c->x86_model >= 0x0e))
                set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
}

static void __cpuinit init_intel(struct cpuinfo_x86 *c)
{
        /* Cache sizes */
        unsigned n;

        init_intel_cacheinfo(c);
        if (c->cpuid_level > 9) {
                unsigned eax = cpuid_eax(10);
                /* Check for version and the number of counters */
                if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
                        set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
        }

        if (cpu_has_ds) {
                unsigned int l1, l2;
                rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
                if (!(l1 & (1<<11)))
                        set_cpu_cap(c, X86_FEATURE_BTS);
                if (!(l1 & (1<<12)))
                        set_cpu_cap(c, X86_FEATURE_PEBS);
        }


        if (cpu_has_bts)
                ds_init_intel(c);

        n = c->extended_cpuid_level;
        if (n >= 0x80000008) {
                unsigned eax = cpuid_eax(0x80000008);
                c->x86_virt_bits = (eax >> 8) & 0xff;
                c->x86_phys_bits = eax & 0xff;
                /* CPUID workaround for Intel 0F34 CPU */
                if (c->x86_vendor == X86_VENDOR_INTEL &&
                    c->x86 == 0xF && c->x86_model == 0x3 &&
                    c->x86_mask == 0x4)
                        c->x86_phys_bits = 36;
        }

        if (c->x86 == 15)
                c->x86_cache_alignment = c->x86_clflush_size * 2;
        if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
            (c->x86 == 0x6 && c->x86_model >= 0x0e))
                set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
        if (c->x86 == 6)
                set_cpu_cap(c, X86_FEATURE_REP_GOOD);
        set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
        c->x86_max_cores = intel_num_cpu_cores(c);

        srat_detect_node();
}

static void __cpuinit get_cpu_vendor(struct cpuinfo_x86 *c)
{
        char *v = c->x86_vendor_id;

        if (!strcmp(v, "AuthenticAMD"))
                c->x86_vendor = X86_VENDOR_AMD;
        else if (!strcmp(v, "GenuineIntel"))
                c->x86_vendor = X86_VENDOR_INTEL;
        else
                c->x86_vendor = X86_VENDOR_UNKNOWN;
}

/* Do some early cpuid on the boot CPU to get some parameter that are
   needed before check_bugs. Everything advanced is in identify_cpu
   below. */
static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
{
        u32 tfms, xlvl;

        c->loops_per_jiffy = loops_per_jiffy;
        c->x86_cache_size = -1;
        c->x86_vendor = X86_VENDOR_UNKNOWN;
        c->x86_model = c->x86_mask = 0; /* So far unknown... */
        c->x86_vendor_id[0] = '\0'; /* Unset */
        c->x86_model_id[0] = '\0';  /* Unset */
        c->x86_clflush_size = 64;
        c->x86_cache_alignment = c->x86_clflush_size;
        c->x86_max_cores = 1;
        c->x86_coreid_bits = 0;
        c->extended_cpuid_level = 0;
        memset(&c->x86_capability, 0, sizeof c->x86_capability);

        /* Get vendor name */
        cpuid(0x00000000, (unsigned int *)&c->cpuid_level,
              (unsigned int *)&c->x86_vendor_id[0],
              (unsigned int *)&c->x86_vendor_id[8],
              (unsigned int *)&c->x86_vendor_id[4]);

        get_cpu_vendor(c);

        /* Initialize the standard set of capabilities */
        /* Note that the vendor-specific code below might override */

        /* Intel-defined flags: level 0x00000001 */
        if (c->cpuid_level >= 0x00000001) {
                __u32 misc;
                cpuid(0x00000001, &tfms, &misc, &c->x86_capability[4],
                      &c->x86_capability[0]);
                c->x86 = (tfms >> 8) & 0xf;
                c->x86_model = (tfms >> 4) & 0xf;
                c->x86_mask = tfms & 0xf;
                if (c->x86 == 0xf)
                        c->x86 += (tfms >> 20) & 0xff;
                if (c->x86 >= 0x6)
                        c->x86_model += ((tfms >> 16) & 0xF) << 4;
                if (c->x86_capability[0] & (1<<19))
                        c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
        } else {
                /* Have CPUID level 0 only - unheard of */
                c->x86 = 4;
        }

#ifdef CONFIG_SMP
        c->phys_proc_id = (cpuid_ebx(1) >> 24) & 0xff;
#endif
        /* AMD-defined flags: level 0x80000001 */
        xlvl = cpuid_eax(0x80000000);
        c->extended_cpuid_level = xlvl;
        if ((xlvl & 0xffff0000) == 0x80000000) {
                if (xlvl >= 0x80000001) {
                        c->x86_capability[1] = cpuid_edx(0x80000001);
                        c->x86_capability[6] = cpuid_ecx(0x80000001);
                }
                if (xlvl >= 0x80000004)
                        get_model_name(c); /* Default name */
        }

        /* Transmeta-defined flags: level 0x80860001 */
        xlvl = cpuid_eax(0x80860000);
        if ((xlvl & 0xffff0000) == 0x80860000) {
                /* Don't set x86_cpuid_level here for now to not confuse. */
                if (xlvl >= 0x80860001)
                        c->x86_capability[2] = cpuid_edx(0x80860001);
        }

        c->extended_cpuid_level = cpuid_eax(0x80000000);
        if (c->extended_cpuid_level >= 0x80000007)
                c->x86_power = cpuid_edx(0x80000007);

        switch (c->x86_vendor) {
        case X86_VENDOR_AMD:
                early_init_amd(c);
                break;
        case X86_VENDOR_INTEL:
                early_init_intel(c);
                break;
        }

}

/*
 * This does the hard work of actually picking apart the CPU stuff...
 */
void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
{
        int i;

        early_identify_cpu(c);

        init_scattered_cpuid_features(c);

        c->apicid = phys_pkg_id(0);

        /*
         * Vendor-specific initialization.  In this section we
         * canonicalize the feature flags, meaning if there are
         * features a certain CPU supports which CPUID doesn't
         * tell us, CPUID claiming incorrect flags, or other bugs,
         * we handle them here.
         *
         * At the end of this section, c->x86_capability better
         * indicate the features this CPU genuinely supports!
         */
        switch (c->x86_vendor) {
        case X86_VENDOR_AMD:
                init_amd(c);
                break;

        case X86_VENDOR_INTEL:
                init_intel(c);
                break;

        case X86_VENDOR_UNKNOWN:
        default:
                display_cacheinfo(c);
                break;
        }

        detect_ht(c);

        /*
         * On SMP, boot_cpu_data holds the common feature set between
         * all CPUs; so make sure that we indicate which features are
         * common between the CPUs.  The first time this routine gets
         * executed, c == &boot_cpu_data.
         */
        if (c != &boot_cpu_data) {
                /* AND the already accumulated flags with these */
                for (i = 0; i < NCAPINTS; i++)
                        boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
        }

        /* Clear all flags overriden by options */
        for (i = 0; i < NCAPINTS; i++)
                c->x86_capability[i] &= ~cleared_cpu_caps[i];

#ifdef CONFIG_X86_MCE
        mcheck_init(c);
#endif
        select_idle_routine(c);

        if (c != &boot_cpu_data)
                mtrr_ap_init();
#ifdef CONFIG_NUMA
        numa_add_cpu(smp_processor_id());
#endif

}

static __init int setup_noclflush(char *arg)
{
        setup_clear_cpu_cap(X86_FEATURE_CLFLSH);
        return 1;
}
__setup("noclflush", setup_noclflush);

void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)
{
        if (c->x86_model_id[0])
                printk(KERN_CONT "%s", c->x86_model_id);

        if (c->x86_mask || c->cpuid_level >= 0)
                printk(KERN_CONT " stepping %02x\n", c->x86_mask);
        else
                printk(KERN_CONT "\n");
}

static __init int setup_disablecpuid(char *arg)
{
        int bit;
        if (get_option(&arg, &bit) && bit < NCAPINTS*32)
                setup_clear_cpu_cap(bit);
        else
                return 0;
        return 1;
}
__setup("clearcpuid=", setup_disablecpuid);

/*
 *      Get CPU information for use by the procfs.
 */

static int show_cpuinfo(struct seq_file *m, void *v)
{
        struct cpuinfo_x86 *c = v;
        int cpu = 0, i;

#ifdef CONFIG_SMP
        cpu = c->cpu_index;
#endif

        seq_printf(m, "processor\t: %u\n"
                   "vendor_id\t: %s\n"
                   "cpu family\t: %d\n"
                   "model\t\t: %d\n"
                   "model name\t: %s\n",
                   (unsigned)cpu,
                   c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
                   c->x86,
                   (int)c->x86_model,
                   c->x86_model_id[0] ? c->x86_model_id : "unknown");

        if (c->x86_mask || c->cpuid_level >= 0)
                seq_printf(m, "stepping\t: %d\n", c->x86_mask);
        else
                seq_printf(m, "stepping\t: unknown\n");

        if (cpu_has(c, X86_FEATURE_TSC)) {
                unsigned int freq = cpufreq_quick_get((unsigned)cpu);

                if (!freq)
                        freq = cpu_khz;
                seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
                           freq / 1000, (freq % 1000));
        }

        /* Cache size */
        if (c->x86_cache_size >= 0)
                seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);

#ifdef CONFIG_SMP
        if (smp_num_siblings * c->x86_max_cores > 1) {
                seq_printf(m, "physical id\t: %d\n", c->phys_proc_id);
                seq_printf(m, "siblings\t: %d\n",
                               cpus_weight(per_cpu(cpu_core_map, cpu)));
                seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
                seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
        }
#endif

        seq_printf(m,
                   "fpu\t\t: yes\n"
                   "fpu_exception\t: yes\n"
                   "cpuid level\t: %d\n"
                   "wp\t\t: yes\n"
                   "flags\t\t:",
                   c->cpuid_level);

        for (i = 0; i < 32*NCAPINTS; i++)
                if (cpu_has(c, i) && x86_cap_flags[i] != NULL)
                        seq_printf(m, " %s", x86_cap_flags[i]);

        seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
                   c->loops_per_jiffy/(500000/HZ),
                   (c->loops_per_jiffy/(5000/HZ)) % 100);

        if (c->x86_tlbsize > 0)
                seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize);
        seq_printf(m, "clflush size\t: %d\n", c->x86_clflush_size);
        seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment);

        seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n",
                   c->x86_phys_bits, c->x86_virt_bits);

        seq_printf(m, "power management:");
        for (i = 0; i < 32; i++) {
                if (c->x86_power & (1 << i)) {
                        if (i < ARRAY_SIZE(x86_power_flags) &&
                            x86_power_flags[i])
                                seq_printf(m, "%s%s",
                                           x86_power_flags[i][0]?" ":"",
                                           x86_power_flags[i]);
                        else
                                seq_printf(m, " [%d]", i);
                }
        }

        seq_printf(m, "\n\n");

        return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
        if (*pos == 0)  /* just in case, cpu 0 is not the first */
                *pos = first_cpu(cpu_online_map);
        if ((*pos) < NR_CPUS && cpu_online(*pos))
                return &cpu_data(*pos);
        return NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
        *pos = next_cpu(*pos, cpu_online_map);
        return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

const struct seq_operations cpuinfo_op = {
        .start = c_start,
        .next = c_next,
        .stop = c_stop,
        .show = show_cpuinfo,
};