[IA64] IA64 Kexec/kdump

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / ia64 / sn / kernel / setup.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1999,2001-2006 Silicon Graphics, Inc. All rights reserved.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/kdev_t.h>
#include <linux/string.h>
#include <linux/screen_info.h>
#include <linux/console.h>
#include <linux/timex.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/serial.h>
#include <linux/irq.h>
#include <linux/bootmem.h>
#include <linux/mmzone.h>
#include <linux/interrupt.h>
#include <linux/acpi.h>
#include <linux/compiler.h>
#include <linux/sched.h>
#include <linux/root_dev.h>
#include <linux/nodemask.h>
#include <linux/pm.h>
#include <linux/efi.h>

#include <asm/io.h>
#include <asm/sal.h>
#include <asm/machvec.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/vga.h>
#include <asm/sn/arch.h>
#include <asm/sn/addrs.h>
#include <asm/sn/pda.h>
#include <asm/sn/nodepda.h>
#include <asm/sn/sn_cpuid.h>
#include <asm/sn/simulator.h>
#include <asm/sn/leds.h>
#include <asm/sn/bte.h>
#include <asm/sn/shub_mmr.h>
#include <asm/sn/clksupport.h>
#include <asm/sn/sn_sal.h>
#include <asm/sn/geo.h>
#include <asm/sn/sn_feature_sets.h>
#include "xtalk/xwidgetdev.h"
#include "xtalk/hubdev.h"
#include <asm/sn/klconfig.h>


DEFINE_PER_CPU(struct pda_s, pda_percpu);

#define MAX_PHYS_MEMORY         (1UL << IA64_MAX_PHYS_BITS)     /* Max physical address supported */

extern void bte_init_node(nodepda_t *, cnodeid_t);

extern void sn_timer_init(void);
extern unsigned long last_time_offset;
extern void (*ia64_mark_idle) (int);
extern void snidle(int);
extern unsigned long long (*ia64_printk_clock)(void);

unsigned long sn_rtc_cycles_per_second;
EXPORT_SYMBOL(sn_rtc_cycles_per_second);

DEFINE_PER_CPU(struct sn_hub_info_s, __sn_hub_info);
EXPORT_PER_CPU_SYMBOL(__sn_hub_info);

DEFINE_PER_CPU(short, __sn_cnodeid_to_nasid[MAX_COMPACT_NODES]);
EXPORT_PER_CPU_SYMBOL(__sn_cnodeid_to_nasid);

DEFINE_PER_CPU(struct nodepda_s *, __sn_nodepda);
EXPORT_PER_CPU_SYMBOL(__sn_nodepda);

char sn_system_serial_number_string[128];
EXPORT_SYMBOL(sn_system_serial_number_string);
u64 sn_partition_serial_number;
EXPORT_SYMBOL(sn_partition_serial_number);
u8 sn_partition_id;
EXPORT_SYMBOL(sn_partition_id);
u8 sn_system_size;
EXPORT_SYMBOL(sn_system_size);
u8 sn_sharing_domain_size;
EXPORT_SYMBOL(sn_sharing_domain_size);
u8 sn_coherency_id;
EXPORT_SYMBOL(sn_coherency_id);
u8 sn_region_size;
EXPORT_SYMBOL(sn_region_size);
int sn_prom_type;       /* 0=hardware, 1=medusa/realprom, 2=medusa/fakeprom */

short physical_node_map[MAX_NUMALINK_NODES];
static unsigned long sn_prom_features[MAX_PROM_FEATURE_SETS];

EXPORT_SYMBOL(physical_node_map);

int num_cnodes;

static void sn_init_pdas(char **);
static void build_cnode_tables(void);

static nodepda_t *nodepdaindr[MAX_COMPACT_NODES];

/*
 * The format of "screen_info" is strange, and due to early i386-setup
 * code. This is just enough to make the console code think we're on a
 * VGA color display.
 */
struct screen_info sn_screen_info = {
        .orig_x = 0,
        .orig_y = 0,
        .orig_video_mode = 3,
        .orig_video_cols = 80,
        .orig_video_ega_bx = 3,
        .orig_video_lines = 25,
        .orig_video_isVGA = 1,
        .orig_video_points = 16
};

/*
 * This routine can only be used during init, since
 * smp_boot_data is an init data structure.
 * We have to use smp_boot_data.cpu_phys_id to find
 * the physical id of the processor because the normal
 * cpu_physical_id() relies on data structures that
 * may not be initialized yet.
 */

static int __init pxm_to_nasid(int pxm)
{
        int i;
        int nid;

        nid = pxm_to_node(pxm);
        for (i = 0; i < num_node_memblks; i++) {
                if (node_memblk[i].nid == nid) {
                        return NASID_GET(node_memblk[i].start_paddr);
                }
        }
        return -1;
}

/**
 * early_sn_setup - early setup routine for SN platforms
 *
 * Sets up an initial console to aid debugging.  Intended primarily
 * for bringup.  See start_kernel() in init/main.c.
 */

void __init early_sn_setup(void)
{
        efi_system_table_t *efi_systab;
        efi_config_table_t *config_tables;
        struct ia64_sal_systab *sal_systab;
        struct ia64_sal_desc_entry_point *ep;
        char *p;
        int i, j;

        /*
         * Parse enough of the SAL tables to locate the SAL entry point. Since, console
         * IO on SN2 is done via SAL calls, early_printk won't work without this.
         *
         * This code duplicates some of the ACPI table parsing that is in efi.c & sal.c.
         * Any changes to those file may have to be made hereas well.
         */
        efi_systab = (efi_system_table_t *) __va(ia64_boot_param->efi_systab);
        config_tables = __va(efi_systab->tables);
        for (i = 0; i < efi_systab->nr_tables; i++) {
                if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) ==
                    0) {
                        sal_systab = __va(config_tables[i].table);
                        p = (char *)(sal_systab + 1);
                        for (j = 0; j < sal_systab->entry_count; j++) {
                                if (*p == SAL_DESC_ENTRY_POINT) {
                                        ep = (struct ia64_sal_desc_entry_point
                                              *)p;
                                        ia64_sal_handler_init(__va
                                                              (ep->sal_proc),
                                                              __va(ep->gp));
                                        return;
                                }
                                p += SAL_DESC_SIZE(*p);
                        }
                }
        }
        /* Uh-oh, SAL not available?? */
        printk(KERN_ERR "failed to find SAL entry point\n");
}

extern int platform_intr_list[];
static int __initdata shub_1_1_found;

/*
 * sn_check_for_wars
 *
 * Set flag for enabling shub specific wars
 */

static inline int __init is_shub_1_1(int nasid)
{
        unsigned long id;
        int rev;

        if (is_shub2())
                return 0;
        id = REMOTE_HUB_L(nasid, SH1_SHUB_ID);
        rev = (id & SH1_SHUB_ID_REVISION_MASK) >> SH1_SHUB_ID_REVISION_SHFT;
        return rev <= 2;
}

static void __init sn_check_for_wars(void)
{
        int cnode;

        if (is_shub2()) {
                /* none yet */
        } else {
                for_each_online_node(cnode) {
                        if (is_shub_1_1(cnodeid_to_nasid(cnode)))
                                shub_1_1_found = 1;
                }
        }
}

/*
 * Scan the EFI PCDP table (if it exists) for an acceptable VGA console
 * output device.  If one exists, pick it and set sn_legacy_{io,mem} to
 * reflect the bus offsets needed to address it.
 *
 * Since pcdp support in SN is not supported in the 2.4 kernel (or at least
 * the one lbs is based on) just declare the needed structs here.
 *
 * Reference spec http://www.dig64.org/specifications/DIG64_PCDPv20.pdf
 *
 * Returns 0 if no acceptable vga is found, !0 otherwise.
 *
 * Note:  This stuff is duped here because Altix requires the PCDP to
 * locate a usable VGA device due to lack of proper ACPI support.  Structures
 * could be used from drivers/firmware/pcdp.h, but it was decided that moving
 * this file to a more public location just for Altix use was undesireable.
 */

struct hcdp_uart_desc {
        u8      pad[45];
};

struct pcdp {
        u8      signature[4];   /* should be 'HCDP' */
        u32     length;
        u8      rev;            /* should be >=3 for pcdp, <3 for hcdp */
        u8      sum;
        u8      oem_id[6];
        u64     oem_tableid;
        u32     oem_rev;
        u32     creator_id;
        u32     creator_rev;
        u32     num_type0;
        struct hcdp_uart_desc uart[0];  /* num_type0 of these */
        /* pcdp descriptors follow */
}  __attribute__((packed));

struct pcdp_device_desc {
        u8      type;
        u8      primary;
        u16     length;
        u16     index;
        /* interconnect specific structure follows */
        /* device specific structure follows that */
}  __attribute__((packed));

struct pcdp_interface_pci {
        u8      type;           /* 1 == pci */
        u8      reserved;
        u16     length;
        u8      segment;
        u8      bus;
        u8      dev;
        u8      fun;
        u16     devid;
        u16     vendid;
        u32     acpi_interrupt;
        u64     mmio_tra;
        u64     ioport_tra;
        u8      flags;
        u8      translation;
}  __attribute__((packed));

struct pcdp_vga_device {
        u8      num_eas_desc;
        /* ACPI Extended Address Space Desc follows */
}  __attribute__((packed));

/* from pcdp_device_desc.primary */
#define PCDP_PRIMARY_CONSOLE    0x01

/* from pcdp_device_desc.type */
#define PCDP_CONSOLE_INOUT      0x0
#define PCDP_CONSOLE_DEBUG      0x1
#define PCDP_CONSOLE_OUT        0x2
#define PCDP_CONSOLE_IN         0x3
#define PCDP_CONSOLE_TYPE_VGA   0x8

#define PCDP_CONSOLE_VGA        (PCDP_CONSOLE_TYPE_VGA | PCDP_CONSOLE_OUT)

/* from pcdp_interface_pci.type */
#define PCDP_IF_PCI             1

/* from pcdp_interface_pci.translation */
#define PCDP_PCI_TRANS_IOPORT   0x02
#define PCDP_PCI_TRANS_MMIO     0x01

#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
static void
sn_scan_pcdp(void)
{
        u8 *bp;
        struct pcdp *pcdp;
        struct pcdp_device_desc device;
        struct pcdp_interface_pci if_pci;
        extern struct efi efi;

        if (efi.hcdp == EFI_INVALID_TABLE_ADDR)
                return;         /* no hcdp/pcdp table */

        pcdp = __va(efi.hcdp);

        if (pcdp->rev < 3)
                return;         /* only support PCDP (rev >= 3) */

        for (bp = (u8 *)&pcdp->uart[pcdp->num_type0];
             bp < (u8 *)pcdp + pcdp->length;
             bp += device.length) {
                memcpy(&device, bp, sizeof(device));
                if (! (device.primary & PCDP_PRIMARY_CONSOLE))
                        continue;       /* not primary console */

                if (device.type != PCDP_CONSOLE_VGA)
                        continue;       /* not VGA descriptor */

                memcpy(&if_pci, bp+sizeof(device), sizeof(if_pci));
                if (if_pci.type != PCDP_IF_PCI)
                        continue;       /* not PCI interconnect */

                if (if_pci.translation & PCDP_PCI_TRANS_IOPORT)
                        vga_console_iobase =
                                if_pci.ioport_tra | __IA64_UNCACHED_OFFSET;

                if (if_pci.translation & PCDP_PCI_TRANS_MMIO)
                        vga_console_membase =
                                if_pci.mmio_tra | __IA64_UNCACHED_OFFSET;

                break; /* once we find the primary, we're done */
        }
}
#endif

static unsigned long sn2_rtc_initial;

static unsigned long long ia64_sn2_printk_clock(void)
{
        unsigned long rtc_now = rtc_time();

        return (rtc_now - sn2_rtc_initial) *
                (1000000000 / sn_rtc_cycles_per_second);
}

/**
 * sn_setup - SN platform setup routine
 * @cmdline_p: kernel command line
 *
 * Handles platform setup for SN machines.  This includes determining
 * the RTC frequency (via a SAL call), initializing secondary CPUs, and
 * setting up per-node data areas.  The console is also initialized here.
 */
void __init sn_setup(char **cmdline_p)
{
        long status, ticks_per_sec, drift;
        u32 version = sn_sal_rev();
        extern void sn_cpu_init(void);

        sn2_rtc_initial = rtc_time();
        ia64_sn_plat_set_error_handling_features();     // obsolete
        ia64_sn_set_os_feature(OSF_MCA_SLV_TO_OS_INIT_SLV);
        ia64_sn_set_os_feature(OSF_FEAT_LOG_SBES);
        /*
         * Note: The calls to notify the PROM of ACPI and PCI Segment
         *       support must be done prior to acpi_load_tables(), as
         *       an ACPI capable PROM will rebuild the DSDT as result
         *       of the call.
         */
        ia64_sn_set_os_feature(OSF_PCISEGMENT_ENABLE);
        ia64_sn_set_os_feature(OSF_ACPI_ENABLE);


#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
        /*
         * Handle SN vga console.
         *
         * SN systems do not have enough ACPI table information
         * being passed from prom to identify VGA adapters and the legacy
         * addresses to access them.  Until that is done, SN systems rely
         * on the PCDP table to identify the primary VGA console if one
         * exists.
         *
         * However, kernel PCDP support is optional, and even if it is built
         * into the kernel, it will not be used if the boot cmdline contains
         * console= directives.
         *
         * So, to work around this mess, we duplicate some of the PCDP code
         * here so that the primary VGA console (as defined by PCDP) will
         * work on SN systems even if a different console (e.g. serial) is
         * selected on the boot line (or CONFIG_EFI_PCDP is off).
         */

        if (! vga_console_membase)
                sn_scan_pcdp();

        /*
         *      Setup legacy IO space.
         *      vga_console_iobase maps to PCI IO Space address 0 on the
         *      bus containing the VGA console.
         */
        if (vga_console_iobase) {
                io_space[0].mmio_base = vga_console_iobase;
                io_space[0].sparse = 0;
        }

        if (vga_console_membase) {
                /* usable vga ... make tty0 the preferred default console */
                if (!strstr(*cmdline_p, "console="))
                        add_preferred_console("tty", 0, NULL);
        } else {
                printk(KERN_DEBUG "SGI: Disabling VGA console\n");
                if (!strstr(*cmdline_p, "console="))
                        add_preferred_console("ttySG", 0, NULL);
#ifdef CONFIG_DUMMY_CONSOLE
                conswitchp = &dummy_con;
#else
                conswitchp = NULL;
#endif                          /* CONFIG_DUMMY_CONSOLE */
        }
#endif                          /* def(CONFIG_VT) && def(CONFIG_VGA_CONSOLE) */

        MAX_DMA_ADDRESS = PAGE_OFFSET + MAX_PHYS_MEMORY;

        /*
         * Build the tables for managing cnodes.
         */
        build_cnode_tables();

        status =
            ia64_sal_freq_base(SAL_FREQ_BASE_REALTIME_CLOCK, &ticks_per_sec,
                               &drift);
        if (status != 0 || ticks_per_sec < 100000) {
                printk(KERN_WARNING
                       "unable to determine platform RTC clock frequency, guessing.\n");
                /* PROM gives wrong value for clock freq. so guess */
                sn_rtc_cycles_per_second = 1000000000000UL / 30000UL;
        } else
                sn_rtc_cycles_per_second = ticks_per_sec;

        platform_intr_list[ACPI_INTERRUPT_CPEI] = IA64_CPE_VECTOR;

        ia64_printk_clock = ia64_sn2_printk_clock;

        printk("SGI SAL version %x.%02x\n", version >> 8, version & 0x00FF);

        /*
         * we set the default root device to /dev/hda
         * to make simulation easy
         */
        ROOT_DEV = Root_HDA1;

        /*
         * Create the PDAs and NODEPDAs for all the cpus.
         */
        sn_init_pdas(cmdline_p);

        ia64_mark_idle = &snidle;

        /*
         * For the bootcpu, we do this here. All other cpus will make the
         * call as part of cpu_init in slave cpu initialization.
         */
        sn_cpu_init();

#ifdef CONFIG_SMP
        init_smp_config();
#endif
        screen_info = sn_screen_info;

        sn_timer_init();

        /*
         * set pm_power_off to a SAL call to allow
         * sn machines to power off. The SAL call can be replaced
         * by an ACPI interface call when ACPI is fully implemented
         * for sn.
         */
        pm_power_off = ia64_sn_power_down;
        current->thread.flags |= IA64_THREAD_MIGRATION;
}

/**
 * sn_init_pdas - setup node data areas
 *
 * One time setup for Node Data Area.  Called by sn_setup().
 */
static void __init sn_init_pdas(char **cmdline_p)
{
        cnodeid_t cnode;

        /*
         * Allocate & initalize the nodepda for each node.
         */
        for_each_online_node(cnode) {
                nodepdaindr[cnode] =
                    alloc_bootmem_node(NODE_DATA(cnode), sizeof(nodepda_t));
                memset(nodepdaindr[cnode], 0, sizeof(nodepda_t));
                memset(nodepdaindr[cnode]->phys_cpuid, -1,
                    sizeof(nodepdaindr[cnode]->phys_cpuid));
                spin_lock_init(&nodepdaindr[cnode]->ptc_lock);
        }

        /*
         * Allocate & initialize nodepda for TIOs.  For now, put them on node 0.
         */
        for (cnode = num_online_nodes(); cnode < num_cnodes; cnode++) {
                nodepdaindr[cnode] =
                    alloc_bootmem_node(NODE_DATA(0), sizeof(nodepda_t));
                memset(nodepdaindr[cnode], 0, sizeof(nodepda_t));
        }

        /*
         * Now copy the array of nodepda pointers to each nodepda.
         */
        for (cnode = 0; cnode < num_cnodes; cnode++)
                memcpy(nodepdaindr[cnode]->pernode_pdaindr, nodepdaindr,
                       sizeof(nodepdaindr));

        /*
         * Set up IO related platform-dependent nodepda fields.
         * The following routine actually sets up the hubinfo struct
         * in nodepda.
         */
        for_each_online_node(cnode) {
                bte_init_node(nodepdaindr[cnode], cnode);
        }

        /*
         * Initialize the per node hubdev.  This includes IO Nodes and
         * headless/memless nodes.
         */
        for (cnode = 0; cnode < num_cnodes; cnode++) {
                hubdev_init_node(nodepdaindr[cnode], cnode);
        }
}

/**
 * sn_cpu_init - initialize per-cpu data areas
 * @cpuid: cpuid of the caller
 *
 * Called during cpu initialization on each cpu as it starts.
 * Currently, initializes the per-cpu data area for SNIA.
 * Also sets up a few fields in the nodepda.  Also known as
 * platform_cpu_init() by the ia64 machvec code.
 */
void __cpuinit sn_cpu_init(void)
{
        int cpuid;
        int cpuphyid;
        int nasid;
        int subnode;
        int slice;
        int cnode;
        int i;
        static int wars_have_been_checked;

        cpuid = smp_processor_id();
        if (cpuid == 0 && IS_MEDUSA()) {
                if (ia64_sn_is_fake_prom())
                        sn_prom_type = 2;
                else
                        sn_prom_type = 1;
                printk(KERN_INFO "Running on medusa with %s PROM\n",
                       (sn_prom_type == 1) ? "real" : "fake");
        }

        memset(pda, 0, sizeof(pda));
        if (ia64_sn_get_sn_info(0, &sn_hub_info->shub2,
                                &sn_hub_info->nasid_bitmask,
                                &sn_hub_info->nasid_shift,
                                &sn_system_size, &sn_sharing_domain_size,
                                &sn_partition_id, &sn_coherency_id,
                                &sn_region_size))
                BUG();
        sn_hub_info->as_shift = sn_hub_info->nasid_shift - 2;

        /*
         * Don't check status. The SAL call is not supported on all PROMs
         * but a failure is harmless.
         */
        (void) ia64_sn_set_cpu_number(cpuid);

        /*
         * The boot cpu makes this call again after platform initialization is
         * complete.
         */
        if (nodepdaindr[0] == NULL)
                return;

        for (i = 0; i < MAX_PROM_FEATURE_SETS; i++)
                if (ia64_sn_get_prom_feature_set(i, &sn_prom_features[i]) != 0)
                        break;

        cpuphyid = get_sapicid();

        if (ia64_sn_get_sapic_info(cpuphyid, &nasid, &subnode, &slice))
                BUG();

        for (i=0; i < MAX_NUMNODES; i++) {
                if (nodepdaindr[i]) {
                        nodepdaindr[i]->phys_cpuid[cpuid].nasid = nasid;
                        nodepdaindr[i]->phys_cpuid[cpuid].slice = slice;
                        nodepdaindr[i]->phys_cpuid[cpuid].subnode = subnode;
                }
        }

        cnode = nasid_to_cnodeid(nasid);

        sn_nodepda = nodepdaindr[cnode];

        pda->led_address =
            (typeof(pda->led_address)) (LED0 + (slice << LED_CPU_SHIFT));
        pda->led_state = LED_ALWAYS_SET;
        pda->hb_count = HZ / 2;
        pda->hb_state = 0;
        pda->idle_flag = 0;

        if (cpuid != 0) {
                /* copy cpu 0's sn_cnodeid_to_nasid table to this cpu's */
                memcpy(sn_cnodeid_to_nasid,
                       (&per_cpu(__sn_cnodeid_to_nasid, 0)),
                       sizeof(__ia64_per_cpu_var(__sn_cnodeid_to_nasid)));
        }

        /*
         * Check for WARs.
         * Only needs to be done once, on BSP.
         * Has to be done after loop above, because it uses this cpu's
         * sn_cnodeid_to_nasid table which was just initialized if this
         * isn't cpu 0.
         * Has to be done before assignment below.
         */
        if (!wars_have_been_checked) {
                sn_check_for_wars();
                wars_have_been_checked = 1;
        }
        sn_hub_info->shub_1_1_found = shub_1_1_found;

        /*
         * Set up addresses of PIO/MEM write status registers.
         */
        {
                u64 pio1[] = {SH1_PIO_WRITE_STATUS_0, 0, SH1_PIO_WRITE_STATUS_1, 0};
                u64 pio2[] = {SH2_PIO_WRITE_STATUS_0, SH2_PIO_WRITE_STATUS_2,
                        SH2_PIO_WRITE_STATUS_1, SH2_PIO_WRITE_STATUS_3};
                u64 *pio;
                pio = is_shub1() ? pio1 : pio2;
                pda->pio_write_status_addr =
                   (volatile unsigned long *)GLOBAL_MMR_ADDR(nasid, pio[slice]);
                pda->pio_write_status_val = is_shub1() ? SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK : 0;
        }

        /*
         * WAR addresses for SHUB 1.x.
         */
        if (local_node_data->active_cpu_count++ == 0 && is_shub1()) {
                int buddy_nasid;
                buddy_nasid =
                    cnodeid_to_nasid(numa_node_id() ==
                                     num_online_nodes() - 1 ? 0 : numa_node_id() + 1);
                pda->pio_shub_war_cam_addr =
                    (volatile unsigned long *)GLOBAL_MMR_ADDR(nasid,
                                                              SH1_PI_CAM_CONTROL);
        }
}

/*
 * Build tables for converting between NASIDs and cnodes.
 */
static inline int __init board_needs_cnode(int type)
{
        return (type == KLTYPE_SNIA || type == KLTYPE_TIO);
}

void __init build_cnode_tables(void)
{
        int nasid;
        int node;
        lboard_t *brd;

        memset(physical_node_map, -1, sizeof(physical_node_map));
        memset(sn_cnodeid_to_nasid, -1,
                        sizeof(__ia64_per_cpu_var(__sn_cnodeid_to_nasid)));

        /*
         * First populate the tables with C/M bricks. This ensures that
         * cnode == node for all C & M bricks.
         */
        for_each_online_node(node) {
                nasid = pxm_to_nasid(node_to_pxm(node));
                sn_cnodeid_to_nasid[node] = nasid;
                physical_node_map[nasid] = node;
        }

        /*
         * num_cnodes is total number of C/M/TIO bricks. Because of the 256 node
         * limit on the number of nodes, we can't use the generic node numbers 
         * for this. Note that num_cnodes is incremented below as TIOs or
         * headless/memoryless nodes are discovered.
         */
        num_cnodes = num_online_nodes();

        /* fakeprom does not support klgraph */
        if (IS_RUNNING_ON_FAKE_PROM())
                return;

        /* Find TIOs & headless/memoryless nodes and add them to the tables */
        for_each_online_node(node) {
                kl_config_hdr_t *klgraph_header;
                nasid = cnodeid_to_nasid(node);
                klgraph_header = ia64_sn_get_klconfig_addr(nasid);
                if (klgraph_header == NULL)
                        BUG();
                brd = NODE_OFFSET_TO_LBOARD(nasid, klgraph_header->ch_board_info);
                while (brd) {
                        if (board_needs_cnode(brd->brd_type) && physical_node_map[brd->brd_nasid] < 0) {
                                sn_cnodeid_to_nasid[num_cnodes] = brd->brd_nasid;
                                physical_node_map[brd->brd_nasid] = num_cnodes++;
                        }
                        brd = find_lboard_next(brd);
                }
        }
}

int
nasid_slice_to_cpuid(int nasid, int slice)
{
        long cpu;

        for (cpu = 0; cpu < NR_CPUS; cpu++)
                if (cpuid_to_nasid(cpu) == nasid &&
                                        cpuid_to_slice(cpu) == slice)
                        return cpu;

        return -1;
}

int sn_prom_feature_available(int id)
{
        if (id >= BITS_PER_LONG * MAX_PROM_FEATURE_SETS)
                return 0;
        return test_bit(id, sn_prom_features);
}

void
sn_kernel_launch_event(void)
{
        /* ignore status until we understand possible failure, if any*/
        if (ia64_sn_kernel_launch_event())
                printk(KERN_ERR "KEXEC is not supported in this PROM, Please update the PROM.\n");
}
EXPORT_SYMBOL(sn_prom_feature_available);