[IA64] Use bitmaps for efficient context allocation/free

[linux-2.6] / arch / ia64 / kernel / setup.c

/*
 * Architecture-specific setup.
 *
 * Copyright (C) 1998-2001, 2003-2004 Hewlett-Packard Co
 *      David Mosberger-Tang <davidm@hpl.hp.com>
 *      Stephane Eranian <eranian@hpl.hp.com>
 * Copyright (C) 2000, 2004 Intel Corp
 *      Rohit Seth <rohit.seth@intel.com>
 *      Suresh Siddha <suresh.b.siddha@intel.com>
 *      Gordon Jin <gordon.jin@intel.com>
 * Copyright (C) 1999 VA Linux Systems
 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 *
 * 12/26/04 S.Siddha, G.Jin, R.Seth
 *                      Add multi-threading and multi-core detection
 * 11/12/01 D.Mosberger Convert get_cpuinfo() to seq_file based show_cpuinfo().
 * 04/04/00 D.Mosberger renamed cpu_initialized to cpu_online_map
 * 03/31/00 R.Seth      cpu_initialized and current->processor fixes
 * 02/04/00 D.Mosberger some more get_cpuinfo fixes...
 * 02/01/00 R.Seth      fixed get_cpuinfo for SMP
 * 01/07/99 S.Eranian   added the support for command line argument
 * 06/24/99 W.Drummond  added boot_cpu_data.
 * 05/28/05 Z. Menyhart Dynamic stride size for "flush_icache_range()"
 */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>

#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <linux/threads.h>
#include <linux/tty.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/efi.h>
#include <linux/initrd.h>
#include <linux/platform.h>
#include <linux/pm.h>

#include <asm/ia32.h>
#include <asm/machvec.h>
#include <asm/mca.h>
#include <asm/meminit.h>
#include <asm/page.h>
#include <asm/patch.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/sal.h>
#include <asm/sections.h>
#include <asm/serial.h>
#include <asm/setup.h>
#include <asm/smp.h>
#include <asm/system.h>
#include <asm/unistd.h>

#if defined(CONFIG_SMP) && (IA64_CPU_SIZE > PAGE_SIZE)
# error "struct cpuinfo_ia64 too big!"
#endif

#ifdef CONFIG_SMP
unsigned long __per_cpu_offset[NR_CPUS];
EXPORT_SYMBOL(__per_cpu_offset);
#endif

DEFINE_PER_CPU(struct cpuinfo_ia64, cpu_info);
DEFINE_PER_CPU(unsigned long, local_per_cpu_offset);
DEFINE_PER_CPU(unsigned long, ia64_phys_stacked_size_p8);
unsigned long ia64_cycles_per_usec;
struct ia64_boot_param *ia64_boot_param;
struct screen_info screen_info;
unsigned long vga_console_iobase;
unsigned long vga_console_membase;

static struct resource data_resource = {
        .name   = "Kernel data",
        .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
};

static struct resource code_resource = {
        .name   = "Kernel code",
        .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
};
extern void efi_initialize_iomem_resources(struct resource *,
                struct resource *);
extern char _text[], _end[], _etext[];

unsigned long ia64_max_cacheline_size;
unsigned long ia64_iobase;      /* virtual address for I/O accesses */
EXPORT_SYMBOL(ia64_iobase);
struct io_space io_space[MAX_IO_SPACES];
EXPORT_SYMBOL(io_space);
unsigned int num_io_spaces;

/*
 * "flush_icache_range()" needs to know what processor dependent stride size to use
 * when it makes i-cache(s) coherent with d-caches.
 */
#define I_CACHE_STRIDE_SHIFT    5       /* Safest way to go: 32 bytes by 32 bytes */
unsigned long ia64_i_cache_stride_shift = ~0;

/*
 * The merge_mask variable needs to be set to (max(iommu_page_size(iommu)) - 1).  This
 * mask specifies a mask of address bits that must be 0 in order for two buffers to be
 * mergeable by the I/O MMU (i.e., the end address of the first buffer and the start
 * address of the second buffer must be aligned to (merge_mask+1) in order to be
 * mergeable).  By default, we assume there is no I/O MMU which can merge physically
 * discontiguous buffers, so we set the merge_mask to ~0UL, which corresponds to a iommu
 * page-size of 2^64.
 */
unsigned long ia64_max_iommu_merge_mask = ~0UL;
EXPORT_SYMBOL(ia64_max_iommu_merge_mask);

/*
 * We use a special marker for the end of memory and it uses the extra (+1) slot
 */
struct rsvd_region rsvd_region[IA64_MAX_RSVD_REGIONS + 1];
int num_rsvd_regions;


/*
 * Filter incoming memory segments based on the primitive map created from the boot
 * parameters. Segments contained in the map are removed from the memory ranges. A
 * caller-specified function is called with the memory ranges that remain after filtering.
 * This routine does not assume the incoming segments are sorted.
 */
int
filter_rsvd_memory (unsigned long start, unsigned long end, void *arg)
{
        unsigned long range_start, range_end, prev_start;
        void (*func)(unsigned long, unsigned long, int);
        int i;

#if IGNORE_PFN0
        if (start == PAGE_OFFSET) {
                printk(KERN_WARNING "warning: skipping physical page 0\n");
                start += PAGE_SIZE;
                if (start >= end) return 0;
        }
#endif
        /*
         * lowest possible address(walker uses virtual)
         */
        prev_start = PAGE_OFFSET;
        func = arg;

        for (i = 0; i < num_rsvd_regions; ++i) {
                range_start = max(start, prev_start);
                range_end   = min(end, rsvd_region[i].start);

                if (range_start < range_end)
                        call_pernode_memory(__pa(range_start), range_end - range_start, func);

                /* nothing more available in this segment */
                if (range_end == end) return 0;

                prev_start = rsvd_region[i].end;
        }
        /* end of memory marker allows full processing inside loop body */
        return 0;
}

static void
sort_regions (struct rsvd_region *rsvd_region, int max)
{
        int j;

        /* simple bubble sorting */
        while (max--) {
                for (j = 0; j < max; ++j) {
                        if (rsvd_region[j].start > rsvd_region[j+1].start) {
                                struct rsvd_region tmp;
                                tmp = rsvd_region[j];
                                rsvd_region[j] = rsvd_region[j + 1];
                                rsvd_region[j + 1] = tmp;
                        }
                }
        }
}

/*
 * Request address space for all standard resources
 */
static int __init register_memory(void)
{
        code_resource.start = ia64_tpa(_text);
        code_resource.end   = ia64_tpa(_etext) - 1;
        data_resource.start = ia64_tpa(_etext);
        data_resource.end   = ia64_tpa(_end) - 1;
        efi_initialize_iomem_resources(&code_resource, &data_resource);

        return 0;
}

__initcall(register_memory);

/**
 * reserve_memory - setup reserved memory areas
 *
 * Setup the reserved memory areas set aside for the boot parameters,
 * initrd, etc.  There are currently %IA64_MAX_RSVD_REGIONS defined,
 * see include/asm-ia64/meminit.h if you need to define more.
 */
void
reserve_memory (void)
{
        int n = 0;

        /*
         * none of the entries in this table overlap
         */
        rsvd_region[n].start = (unsigned long) ia64_boot_param;
        rsvd_region[n].end   = rsvd_region[n].start + sizeof(*ia64_boot_param);
        n++;

        rsvd_region[n].start = (unsigned long) __va(ia64_boot_param->efi_memmap);
        rsvd_region[n].end   = rsvd_region[n].start + ia64_boot_param->efi_memmap_size;
        n++;

        rsvd_region[n].start = (unsigned long) __va(ia64_boot_param->command_line);
        rsvd_region[n].end   = (rsvd_region[n].start
                                + strlen(__va(ia64_boot_param->command_line)) + 1);
        n++;

        rsvd_region[n].start = (unsigned long) ia64_imva((void *)KERNEL_START);
        rsvd_region[n].end   = (unsigned long) ia64_imva(_end);
        n++;

#ifdef CONFIG_BLK_DEV_INITRD
        if (ia64_boot_param->initrd_start) {
                rsvd_region[n].start = (unsigned long)__va(ia64_boot_param->initrd_start);
                rsvd_region[n].end   = rsvd_region[n].start + ia64_boot_param->initrd_size;
                n++;
        }
#endif

        efi_memmap_init(&rsvd_region[n].start, &rsvd_region[n].end);
        n++;

        /* end of memory marker */
        rsvd_region[n].start = ~0UL;
        rsvd_region[n].end   = ~0UL;
        n++;

        num_rsvd_regions = n;

        sort_regions(rsvd_region, num_rsvd_regions);
}

/**
 * find_initrd - get initrd parameters from the boot parameter structure
 *
 * Grab the initrd start and end from the boot parameter struct given us by
 * the boot loader.
 */
void
find_initrd (void)
{
#ifdef CONFIG_BLK_DEV_INITRD
        if (ia64_boot_param->initrd_start) {
                initrd_start = (unsigned long)__va(ia64_boot_param->initrd_start);
                initrd_end   = initrd_start+ia64_boot_param->initrd_size;

                printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n",
                       initrd_start, ia64_boot_param->initrd_size);
        }
#endif
}

static void __init
io_port_init (void)
{
        unsigned long phys_iobase;

        /*
         * Set `iobase' based on the EFI memory map or, failing that, the
         * value firmware left in ar.k0.
         *
         * Note that in ia32 mode, IN/OUT instructions use ar.k0 to compute
         * the port's virtual address, so ia32_load_state() loads it with a
         * user virtual address.  But in ia64 mode, glibc uses the
         * *physical* address in ar.k0 to mmap the appropriate area from
         * /dev/mem, and the inX()/outX() interfaces use MMIO.  In both
         * cases, user-mode can only use the legacy 0-64K I/O port space.
         *
         * ar.k0 is not involved in kernel I/O port accesses, which can use
         * any of the I/O port spaces and are done via MMIO using the
         * virtual mmio_base from the appropriate io_space[].
         */
        phys_iobase = efi_get_iobase();
        if (!phys_iobase) {
                phys_iobase = ia64_get_kr(IA64_KR_IO_BASE);
                printk(KERN_INFO "No I/O port range found in EFI memory map, "
                        "falling back to AR.KR0 (0x%lx)\n", phys_iobase);
        }
        ia64_iobase = (unsigned long) ioremap(phys_iobase, 0);
        ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase));

        /* setup legacy IO port space */
        io_space[0].mmio_base = ia64_iobase;
        io_space[0].sparse = 1;
        num_io_spaces = 1;
}

/**
 * early_console_setup - setup debugging console
 *
 * Consoles started here require little enough setup that we can start using
 * them very early in the boot process, either right after the machine
 * vector initialization, or even before if the drivers can detect their hw.
 *
 * Returns non-zero if a console couldn't be setup.
 */
static inline int __init
early_console_setup (char *cmdline)
{
        int earlycons = 0;

#ifdef CONFIG_SERIAL_SGI_L1_CONSOLE
        {
                extern int sn_serial_console_early_setup(void);
                if (!sn_serial_console_early_setup())
                        earlycons++;
        }
#endif
#ifdef CONFIG_EFI_PCDP
        if (!efi_setup_pcdp_console(cmdline))
                earlycons++;
#endif
#ifdef CONFIG_SERIAL_8250_CONSOLE
        if (!early_serial_console_init(cmdline))
                earlycons++;
#endif

        return (earlycons) ? 0 : -1;
}

static inline void
mark_bsp_online (void)
{
#ifdef CONFIG_SMP
        /* If we register an early console, allow CPU 0 to printk */
        cpu_set(smp_processor_id(), cpu_online_map);
#endif
}

#ifdef CONFIG_SMP
static void
check_for_logical_procs (void)
{
        pal_logical_to_physical_t info;
        s64 status;

        status = ia64_pal_logical_to_phys(0, &info);
        if (status == -1) {
                printk(KERN_INFO "No logical to physical processor mapping "
                       "available\n");
                return;
        }
        if (status) {
                printk(KERN_ERR "ia64_pal_logical_to_phys failed with %ld\n",
                       status);
                return;
        }
        /*
         * Total number of siblings that BSP has.  Though not all of them 
         * may have booted successfully. The correct number of siblings 
         * booted is in info.overview_num_log.
         */
        smp_num_siblings = info.overview_tpc;
        smp_num_cpucores = info.overview_cpp;
}
#endif

void __init
setup_arch (char **cmdline_p)
{
        unw_init();

        ia64_patch_vtop((u64) __start___vtop_patchlist, (u64) __end___vtop_patchlist);

        *cmdline_p = __va(ia64_boot_param->command_line);
        strlcpy(saved_command_line, *cmdline_p, COMMAND_LINE_SIZE);

        efi_init();
        io_port_init();

#ifdef CONFIG_IA64_GENERIC
        {
                const char *mvec_name = strstr (*cmdline_p, "machvec=");
                char str[64];

                if (mvec_name) {
                        const char *end;
                        size_t len;

                        mvec_name += 8;
                        end = strchr (mvec_name, ' ');
                        if (end)
                                len = end - mvec_name;
                        else
                                len = strlen (mvec_name);
                        len = min(len, sizeof (str) - 1);
                        strncpy (str, mvec_name, len);
                        str[len] = '\0';
                        mvec_name = str;
                } else
                        mvec_name = acpi_get_sysname();
                machvec_init(mvec_name);
        }
#endif

        if (early_console_setup(*cmdline_p) == 0)
                mark_bsp_online();

#ifdef CONFIG_ACPI
        /* Initialize the ACPI boot-time table parser */
        acpi_table_init();
# ifdef CONFIG_ACPI_NUMA
        acpi_numa_init();
# endif
#else
# ifdef CONFIG_SMP
        smp_build_cpu_map();    /* happens, e.g., with the Ski simulator */
# endif
#endif /* CONFIG_APCI_BOOT */

        find_memory();

        /* process SAL system table: */
        ia64_sal_init(efi.sal_systab);

#ifdef CONFIG_SMP
        cpu_physical_id(0) = hard_smp_processor_id();

        cpu_set(0, cpu_sibling_map[0]);
        cpu_set(0, cpu_core_map[0]);

        check_for_logical_procs();
        if (smp_num_cpucores > 1)
                printk(KERN_INFO
                       "cpu package is Multi-Core capable: number of cores=%d\n",
                       smp_num_cpucores);
        if (smp_num_siblings > 1)
                printk(KERN_INFO
                       "cpu package is Multi-Threading capable: number of siblings=%d\n",
                       smp_num_siblings);
#endif

        cpu_init();     /* initialize the bootstrap CPU */
        mmu_context_init();     /* initialize context_id bitmap */

#ifdef CONFIG_ACPI
        acpi_boot_init();
#endif

#ifdef CONFIG_VT
        if (!conswitchp) {
# if defined(CONFIG_DUMMY_CONSOLE)
                conswitchp = &dummy_con;
# endif
# if defined(CONFIG_VGA_CONSOLE)
                /*
                 * Non-legacy systems may route legacy VGA MMIO range to system
                 * memory.  vga_con probes the MMIO hole, so memory looks like
                 * a VGA device to it.  The EFI memory map can tell us if it's
                 * memory so we can avoid this problem.
                 */
                if (efi_mem_type(0xA0000) != EFI_CONVENTIONAL_MEMORY)
                        conswitchp = &vga_con;
# endif
        }
#endif

        /* enable IA-64 Machine Check Abort Handling unless disabled */
        if (!strstr(saved_command_line, "nomca"))
                ia64_mca_init();

        platform_setup(cmdline_p);
        paging_init();
}

/*
 * Display cpu info for all cpu's.
 */
static int
show_cpuinfo (struct seq_file *m, void *v)
{
#ifdef CONFIG_SMP
#       define lpj      c->loops_per_jiffy
#       define cpunum   c->cpu
#else
#       define lpj      loops_per_jiffy
#       define cpunum   0
#endif
        static struct {
                unsigned long mask;
                const char *feature_name;
        } feature_bits[] = {
                { 1UL << 0, "branchlong" },
                { 1UL << 1, "spontaneous deferral"},
                { 1UL << 2, "16-byte atomic ops" }
        };
        char family[32], features[128], *cp, sep;
        struct cpuinfo_ia64 *c = v;
        unsigned long mask;
        int i;

        mask = c->features;

        switch (c->family) {
              case 0x07:        memcpy(family, "Itanium", 8); break;
              case 0x1f:        memcpy(family, "Itanium 2", 10); break;
              default:          sprintf(family, "%u", c->family); break;
        }

        /* build the feature string: */
        memcpy(features, " standard", 10);
        cp = features;
        sep = 0;
        for (i = 0; i < (int) ARRAY_SIZE(feature_bits); ++i) {
                if (mask & feature_bits[i].mask) {
                        if (sep)
                                *cp++ = sep;
                        sep = ',';
                        *cp++ = ' ';
                        strcpy(cp, feature_bits[i].feature_name);
                        cp += strlen(feature_bits[i].feature_name);
                        mask &= ~feature_bits[i].mask;
                }
        }
        if (mask) {
                /* print unknown features as a hex value: */
                if (sep)
                        *cp++ = sep;
                sprintf(cp, " 0x%lx", mask);
        }

        seq_printf(m,
                   "processor  : %d\n"
                   "vendor     : %s\n"
                   "arch       : IA-64\n"
                   "family     : %s\n"
                   "model      : %u\n"
                   "revision   : %u\n"
                   "archrev    : %u\n"
                   "features   :%s\n"   /* don't change this---it _is_ right! */
                   "cpu number : %lu\n"
                   "cpu regs   : %u\n"
                   "cpu MHz    : %lu.%06lu\n"
                   "itc MHz    : %lu.%06lu\n"
                   "BogoMIPS   : %lu.%02lu\n",
                   cpunum, c->vendor, family, c->model, c->revision, c->archrev,
                   features, c->ppn, c->number,
                   c->proc_freq / 1000000, c->proc_freq % 1000000,
                   c->itc_freq / 1000000, c->itc_freq % 1000000,
                   lpj*HZ/500000, (lpj*HZ/5000) % 100);
#ifdef CONFIG_SMP
        seq_printf(m, "siblings   : %u\n", cpus_weight(cpu_core_map[cpunum]));
        if (c->threads_per_core > 1 || c->cores_per_socket > 1)
                seq_printf(m,
                           "physical id: %u\n"
                           "core id    : %u\n"
                           "thread id  : %u\n",
                           c->socket_id, c->core_id, c->thread_id);
#endif
        seq_printf(m,"\n");

        return 0;
}

static void *
c_start (struct seq_file *m, loff_t *pos)
{
#ifdef CONFIG_SMP
        while (*pos < NR_CPUS && !cpu_isset(*pos, cpu_online_map))
                ++*pos;
#endif
        return *pos < NR_CPUS ? cpu_data(*pos) : NULL;
}

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

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

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

void
identify_cpu (struct cpuinfo_ia64 *c)
{
        union {
                unsigned long bits[5];
                struct {
                        /* id 0 & 1: */
                        char vendor[16];

                        /* id 2 */
                        u64 ppn;                /* processor serial number */

                        /* id 3: */
                        unsigned number         :  8;
                        unsigned revision       :  8;
                        unsigned model          :  8;
                        unsigned family         :  8;
                        unsigned archrev        :  8;
                        unsigned reserved       : 24;

                        /* id 4: */
                        u64 features;
                } field;
        } cpuid;
        pal_vm_info_1_u_t vm1;
        pal_vm_info_2_u_t vm2;
        pal_status_t status;
        unsigned long impl_va_msb = 50, phys_addr_size = 44;    /* Itanium defaults */
        int i;

        for (i = 0; i < 5; ++i)
                cpuid.bits[i] = ia64_get_cpuid(i);

        memcpy(c->vendor, cpuid.field.vendor, 16);
#ifdef CONFIG_SMP
        c->cpu = smp_processor_id();

        /* below default values will be overwritten  by identify_siblings() 
         * for Multi-Threading/Multi-Core capable cpu's
         */
        c->threads_per_core = c->cores_per_socket = c->num_log = 1;
        c->socket_id = -1;

        identify_siblings(c);
#endif
        c->ppn = cpuid.field.ppn;
        c->number = cpuid.field.number;
        c->revision = cpuid.field.revision;
        c->model = cpuid.field.model;
        c->family = cpuid.field.family;
        c->archrev = cpuid.field.archrev;
        c->features = cpuid.field.features;

        status = ia64_pal_vm_summary(&vm1, &vm2);
        if (status == PAL_STATUS_SUCCESS) {
                impl_va_msb = vm2.pal_vm_info_2_s.impl_va_msb;
                phys_addr_size = vm1.pal_vm_info_1_s.phys_add_size;
        }
        c->unimpl_va_mask = ~((7L<<61) | ((1L << (impl_va_msb + 1)) - 1));
        c->unimpl_pa_mask = ~((1L<<63) | ((1L << phys_addr_size) - 1));
}

void
setup_per_cpu_areas (void)
{
        /* start_kernel() requires this... */
}

/*
 * Calculate the max. cache line size.
 *
 * In addition, the minimum of the i-cache stride sizes is calculated for
 * "flush_icache_range()".
 */
static void
get_max_cacheline_size (void)
{
        unsigned long line_size, max = 1;
        u64 l, levels, unique_caches;
        pal_cache_config_info_t cci;
        s64 status;

        status = ia64_pal_cache_summary(&levels, &unique_caches);
        if (status != 0) {
                printk(KERN_ERR "%s: ia64_pal_cache_summary() failed (status=%ld)\n",
                       __FUNCTION__, status);
                max = SMP_CACHE_BYTES;
                /* Safest setup for "flush_icache_range()" */
                ia64_i_cache_stride_shift = I_CACHE_STRIDE_SHIFT;
                goto out;
        }

        for (l = 0; l < levels; ++l) {
                status = ia64_pal_cache_config_info(l, /* cache_type (data_or_unified)= */ 2,
                                                    &cci);
                if (status != 0) {
                        printk(KERN_ERR
                               "%s: ia64_pal_cache_config_info(l=%lu, 2) failed (status=%ld)\n",
                               __FUNCTION__, l, status);
                        max = SMP_CACHE_BYTES;
                        /* The safest setup for "flush_icache_range()" */
                        cci.pcci_stride = I_CACHE_STRIDE_SHIFT;
                        cci.pcci_unified = 1;
                }
                line_size = 1 << cci.pcci_line_size;
                if (line_size > max)
                        max = line_size;
                if (!cci.pcci_unified) {
                        status = ia64_pal_cache_config_info(l,
                                                    /* cache_type (instruction)= */ 1,
                                                    &cci);
                        if (status != 0) {
                                printk(KERN_ERR
                                "%s: ia64_pal_cache_config_info(l=%lu, 1) failed (status=%ld)\n",
                                        __FUNCTION__, l, status);
                                /* The safest setup for "flush_icache_range()" */
                                cci.pcci_stride = I_CACHE_STRIDE_SHIFT;
                        }
                }
                if (cci.pcci_stride < ia64_i_cache_stride_shift)
                        ia64_i_cache_stride_shift = cci.pcci_stride;
        }
  out:
        if (max > ia64_max_cacheline_size)
                ia64_max_cacheline_size = max;
}

/*
 * cpu_init() initializes state that is per-CPU.  This function acts
 * as a 'CPU state barrier', nothing should get across.
 */
void
cpu_init (void)
{
        extern void __devinit ia64_mmu_init (void *);
        unsigned long num_phys_stacked;
        pal_vm_info_2_u_t vmi;
        unsigned int max_ctx;
        struct cpuinfo_ia64 *cpu_info;
        void *cpu_data;

        cpu_data = per_cpu_init();

        /*
         * We set ar.k3 so that assembly code in MCA handler can compute
         * physical addresses of per cpu variables with a simple:
         *   phys = ar.k3 + &per_cpu_var
         */
        ia64_set_kr(IA64_KR_PER_CPU_DATA,
                    ia64_tpa(cpu_data) - (long) __per_cpu_start);

        get_max_cacheline_size();

        /*
         * We can't pass "local_cpu_data" to identify_cpu() because we haven't called
         * ia64_mmu_init() yet.  And we can't call ia64_mmu_init() first because it
         * depends on the data returned by identify_cpu().  We break the dependency by
         * accessing cpu_data() through the canonical per-CPU address.
         */
        cpu_info = cpu_data + ((char *) &__ia64_per_cpu_var(cpu_info) - __per_cpu_start);
        identify_cpu(cpu_info);

#ifdef CONFIG_MCKINLEY
        {
#               define FEATURE_SET 16
                struct ia64_pal_retval iprv;

                if (cpu_info->family == 0x1f) {
                        PAL_CALL_PHYS(iprv, PAL_PROC_GET_FEATURES, 0, FEATURE_SET, 0);
                        if ((iprv.status == 0) && (iprv.v0 & 0x80) && (iprv.v2 & 0x80))
                                PAL_CALL_PHYS(iprv, PAL_PROC_SET_FEATURES,
                                              (iprv.v1 | 0x80), FEATURE_SET, 0);
                }
        }
#endif

        /* Clear the stack memory reserved for pt_regs: */
        memset(ia64_task_regs(current), 0, sizeof(struct pt_regs));

        ia64_set_kr(IA64_KR_FPU_OWNER, 0);

        /*
         * Initialize the page-table base register to a global
         * directory with all zeroes.  This ensure that we can handle
         * TLB-misses to user address-space even before we created the
         * first user address-space.  This may happen, e.g., due to
         * aggressive use of lfetch.fault.
         */
        ia64_set_kr(IA64_KR_PT_BASE, __pa(ia64_imva(empty_zero_page)));

        /*
         * Initialize default control register to defer speculative faults except
         * for those arising from TLB misses, which are not deferred.  The
         * kernel MUST NOT depend on a particular setting of these bits (in other words,
         * the kernel must have recovery code for all speculative accesses).  Turn on
         * dcr.lc as per recommendation by the architecture team.  Most IA-32 apps
         * shouldn't be affected by this (moral: keep your ia32 locks aligned and you'll
         * be fine).
         */
        ia64_setreg(_IA64_REG_CR_DCR,  (  IA64_DCR_DP | IA64_DCR_DK | IA64_DCR_DX | IA64_DCR_DR
                                        | IA64_DCR_DA | IA64_DCR_DD | IA64_DCR_LC));
        atomic_inc(&init_mm.mm_count);
        current->active_mm = &init_mm;
        if (current->mm)
                BUG();

        ia64_mmu_init(ia64_imva(cpu_data));
        ia64_mca_cpu_init(ia64_imva(cpu_data));

#ifdef CONFIG_IA32_SUPPORT
        ia32_cpu_init();
#endif

        /* Clear ITC to eliminiate sched_clock() overflows in human time.  */
        ia64_set_itc(0);

        /* disable all local interrupt sources: */
        ia64_set_itv(1 << 16);
        ia64_set_lrr0(1 << 16);
        ia64_set_lrr1(1 << 16);
        ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
        ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);

        /* clear TPR & XTP to enable all interrupt classes: */
        ia64_setreg(_IA64_REG_CR_TPR, 0);
#ifdef CONFIG_SMP
        normal_xtp();
#endif

        /* set ia64_ctx.max_rid to the maximum RID that is supported by all CPUs: */
        if (ia64_pal_vm_summary(NULL, &vmi) == 0)
                max_ctx = (1U << (vmi.pal_vm_info_2_s.rid_size - 3)) - 1;
        else {
                printk(KERN_WARNING "cpu_init: PAL VM summary failed, assuming 18 RID bits\n");
                max_ctx = (1U << 15) - 1;       /* use architected minimum */
        }
        while (max_ctx < ia64_ctx.max_ctx) {
                unsigned int old = ia64_ctx.max_ctx;
                if (cmpxchg(&ia64_ctx.max_ctx, old, max_ctx) == old)
                        break;
        }

        if (ia64_pal_rse_info(&num_phys_stacked, NULL) != 0) {
                printk(KERN_WARNING "cpu_init: PAL RSE info failed; assuming 96 physical "
                       "stacked regs\n");
                num_phys_stacked = 96;
        }
        /* size of physical stacked register partition plus 8 bytes: */
        __get_cpu_var(ia64_phys_stacked_size_p8) = num_phys_stacked*8 + 8;
        platform_cpu_init();
        pm_idle = default_idle;
}

void
check_bugs (void)
{
        ia64_patch_mckinley_e9((unsigned long) __start___mckinley_e9_bundles,
                               (unsigned long) __end___mckinley_e9_bundles);
}