acpi.c

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/*
 *  acpi.c - Architecture-Specific Low-Level ACPI Support
 *
 *  Copyright (C) 1999 VA Linux Systems
 *  Copyright (C) 1999,2000 Walt Drummond <[email protected]>
 *  Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
 *  David Mosberger-Tang <[email protected]>
 *  Copyright (C) 2000 Intel Corp.
 *  Copyright (C) 2000,2001 J.I. Lee <[email protected]>
 *  Copyright (C) 2001 Paul Diefenbaugh <[email protected]>
 *  Copyright (C) 2001 Jenna Hall <[email protected]>
 *  Copyright (C) 2001 Takayoshi Kochi <[email protected]>
 *  Copyright (C) 2002 Erich Focht <[email protected]>
 *  Copyright (C) 2004 Ashok Raj <[email protected]>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/irq.h>
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/mmzone.h>
#include <linux/nodemask.h>
#include <linux/slab.h>
#include <acpi/processor.h>
#include <asm/io.h>
#include <asm/iosapic.h>
#include <asm/machvec.h>
#include <asm/page.h>
#include <asm/numa.h>
#include <asm/sal.h>
#include <asm/cyclone.h>
#include <asm/xen/hypervisor.h>

#define BAD_MADT_ENTRY(entry, end) (                                        \
        (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
        ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))

#define PREFIX          "ACPI: "

u32 acpi_rsdt_forced;
unsigned int acpi_cpei_override;
unsigned int acpi_cpei_phys_cpuid;

unsigned long acpi_wakeup_address = 0;

#ifdef CONFIG_IA64_GENERIC
static unsigned long __init acpi_find_rsdp(void)
{
    unsigned long rsdp_phys = 0;

    if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
        rsdp_phys = efi.acpi20;
    else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
        printk(KERN_WARNING PREFIX
               "v1.0/r0.71 tables no longer supported\n");
    return rsdp_phys;
}

const char __init *
acpi_get_sysname(void)
{
    unsigned long rsdp_phys;
    struct acpi_table_rsdp *rsdp;
    struct acpi_table_xsdt *xsdt;
    struct acpi_table_header *hdr;
#ifdef CONFIG_INTEL_IOMMU
    u64 i, nentries;
#endif

    rsdp_phys = acpi_find_rsdp();
    if (!rsdp_phys) {
        printk(KERN_ERR
               "ACPI 2.0 RSDP not found, default to \"dig\"\n");
        return "dig";
    }

    rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
    if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
        printk(KERN_ERR
               "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
        return "dig";
    }

    xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
    hdr = &xsdt->header;
    if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
        printk(KERN_ERR
               "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
        return "dig";
    }

    if (!strcmp(hdr->oem_id, "HP")) {
        return "hpzx1";
    } else if (!strcmp(hdr->oem_id, "SGI")) {
        if (!strcmp(hdr->oem_table_id + 4, "UV"))
            return "uv";
        else
            return "sn2";
    } else if (xen_pv_domain() && !strcmp(hdr->oem_id, "XEN")) {
        return "xen";
    }

#ifdef CONFIG_INTEL_IOMMU
    /* Look for Intel IOMMU */
    nentries = (hdr->length - sizeof(*hdr)) /
             sizeof(xsdt->table_offset_entry[0]);
    for (i = 0; i < nentries; i++) {
        hdr = __va(xsdt->table_offset_entry[i]);
        if (strncmp(hdr->signature, ACPI_SIG_DMAR,
            sizeof(ACPI_SIG_DMAR) - 1) == 0)
            return "dig_vtd";
    }
#endif

    return "dig";
}
#endif /* CONFIG_IA64_GENERIC */

#define ACPI_MAX_PLATFORM_INTERRUPTS    256

/* Array to record platform interrupt vectors for generic interrupt routing. */
int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
    [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
};

enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;

/*
 * Interrupt routing API for device drivers.  Provides interrupt vector for
 * a generic platform event.  Currently only CPEI is implemented.
 */
int acpi_request_vector(u32 int_type)
{
    int vector = -1;

    if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
        /* corrected platform error interrupt */
        vector = platform_intr_list[int_type];
    } else
        printk(KERN_ERR
               "acpi_request_vector(): invalid interrupt type\n");
    return vector;
}

char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
{
    return __va(phys_addr);
}

void __init __acpi_unmap_table(char *map, unsigned long size)
{
}

/* --------------------------------------------------------------------------
                            Boot-time Table Parsing
   -------------------------------------------------------------------------- */

static int available_cpus __initdata;
struct acpi_table_madt *acpi_madt __initdata;
static u8 has_8259;

static int __init
acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
              const unsigned long end)
{
    struct acpi_madt_local_apic_override *lapic;

    lapic = (struct acpi_madt_local_apic_override *)header;

    if (BAD_MADT_ENTRY(lapic, end))
        return -EINVAL;

    if (lapic->address) {
        iounmap(ipi_base_addr);
        ipi_base_addr = ioremap(lapic->address, 0);
    }
    return 0;
}

static int __init
acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
{
    struct acpi_madt_local_sapic *lsapic;

    lsapic = (struct acpi_madt_local_sapic *)header;

    /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */

    if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
#ifdef CONFIG_SMP
        smp_boot_data.cpu_phys_id[available_cpus] =
            (lsapic->id << 8) | lsapic->eid;
#endif
        ++available_cpus;
    }

    total_cpus++;
    return 0;
}

static int __init
acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
{
    struct acpi_madt_local_apic_nmi *lacpi_nmi;

    lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;

    if (BAD_MADT_ENTRY(lacpi_nmi, end))
        return -EINVAL;

    /* TBD: Support lapic_nmi entries */
    return 0;
}

static int __init
acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
{
    struct acpi_madt_io_sapic *iosapic;

    iosapic = (struct acpi_madt_io_sapic *)header;

    if (BAD_MADT_ENTRY(iosapic, end))
        return -EINVAL;

    return iosapic_init(iosapic->address, iosapic->global_irq_base);
}

static unsigned int __initdata acpi_madt_rev;

static int __init
acpi_parse_plat_int_src(struct acpi_subtable_header * header,
            const unsigned long end)
{
    struct acpi_madt_interrupt_source *plintsrc;
    int vector;

    plintsrc = (struct acpi_madt_interrupt_source *)header;

    if (BAD_MADT_ENTRY(plintsrc, end))
        return -EINVAL;

    /*
     * Get vector assignment for this interrupt, set attributes,
     * and program the IOSAPIC routing table.
     */
    vector = iosapic_register_platform_intr(plintsrc->type,
                        plintsrc->global_irq,
                        plintsrc->io_sapic_vector,
                        plintsrc->eid,
                        plintsrc->id,
                        ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
                         ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
                        IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
                        ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
                         ACPI_MADT_TRIGGER_EDGE) ?
                        IOSAPIC_EDGE : IOSAPIC_LEVEL);

    platform_intr_list[plintsrc->type] = vector;
    if (acpi_madt_rev > 1) {
        acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
    }

    /*
     * Save the physical id, so we can check when its being removed
     */
    acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;

    return 0;
}

#ifdef CONFIG_HOTPLUG_CPU
unsigned int can_cpei_retarget(void)
{
    extern int cpe_vector;
    extern unsigned int force_cpei_retarget;

    /*
     * Only if CPEI is supported and the override flag
     * is present, otherwise return that its re-targettable
     * if we are in polling mode.
     */
    if (cpe_vector > 0) {
        if (acpi_cpei_override || force_cpei_retarget)
            return 1;
        else
            return 0;
    }
    return 1;
}

unsigned int is_cpu_cpei_target(unsigned int cpu)
{
    unsigned int logical_id;

    logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);

    if (logical_id == cpu)
        return 1;
    else
        return 0;
}

void set_cpei_target_cpu(unsigned int cpu)
{
    acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
}
#endif

unsigned int get_cpei_target_cpu(void)
{
    return acpi_cpei_phys_cpuid;
}

static int __init
acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
               const unsigned long end)
{
    struct acpi_madt_interrupt_override *p;

    p = (struct acpi_madt_interrupt_override *)header;

    if (BAD_MADT_ENTRY(p, end))
        return -EINVAL;

    iosapic_override_isa_irq(p->source_irq, p->global_irq,
                 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
                  ACPI_MADT_POLARITY_ACTIVE_LOW) ?
                 IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
                 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
                 ACPI_MADT_TRIGGER_LEVEL) ?
                 IOSAPIC_LEVEL : IOSAPIC_EDGE);
    return 0;
}

static int __init
acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
{
    struct acpi_madt_nmi_source *nmi_src;

    nmi_src = (struct acpi_madt_nmi_source *)header;

    if (BAD_MADT_ENTRY(nmi_src, end))
        return -EINVAL;

    /* TBD: Support nimsrc entries */
    return 0;
}

static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
    if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {

        /*
         * Unfortunately ITC_DRIFT is not yet part of the
         * official SAL spec, so the ITC_DRIFT bit is not
         * set by the BIOS on this hardware.
         */
        sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;

        cyclone_setup();
    }
}

static int __init acpi_parse_madt(struct acpi_table_header *table)
{
    if (!table)
        return -EINVAL;

    acpi_madt = (struct acpi_table_madt *)table;

    acpi_madt_rev = acpi_madt->header.revision;

    /* remember the value for reference after free_initmem() */
#ifdef CONFIG_ITANIUM
    has_8259 = 1;       /* Firmware on old Itanium systems is broken */
#else
    has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
#endif
    iosapic_system_init(has_8259);

    /* Get base address of IPI Message Block */

    if (acpi_madt->address)
        ipi_base_addr = ioremap(acpi_madt->address, 0);

    printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);

    acpi_madt_oem_check(acpi_madt->header.oem_id,
                acpi_madt->header.oem_table_id);

    return 0;
}

#ifdef CONFIG_ACPI_NUMA

#undef SLIT_DEBUG

#define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)

static int __initdata srat_num_cpus;    /* number of cpus */
static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
#define pxm_bit_set(bit)    (set_bit(bit,(void *)pxm_flag))
#define pxm_bit_test(bit)   (test_bit(bit,(void *)pxm_flag))
static struct acpi_table_slit __initdata *slit_table;
cpumask_t early_cpu_possible_map = CPU_MASK_NONE;

static int __init
get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
{
    int pxm;

    pxm = pa->proximity_domain_lo;
    if (ia64_platform_is("sn2") || acpi_srat_revision >= 2)
        pxm += pa->proximity_domain_hi[0] << 8;
    return pxm;
}

static int __init
get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
{
    int pxm;

    pxm = ma->proximity_domain;
    if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
        pxm &= 0xff;

    return pxm;
}

/*
 * ACPI 2.0 SLIT (System Locality Information Table)
 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 */
void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
{
    u32 len;

    len = sizeof(struct acpi_table_header) + 8
        + slit->locality_count * slit->locality_count;
    if (slit->header.length != len) {
        printk(KERN_ERR
               "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
               len, slit->header.length);
        return;
    }
    slit_table = slit;
}

void __init
acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
{
    int pxm;

    if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
        return;

    if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
        printk_once(KERN_WARNING
                "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
                ARRAY_SIZE(node_cpuid));
        return;
    }
    pxm = get_processor_proximity_domain(pa);

    /* record this node in proximity bitmap */
    pxm_bit_set(pxm);

    node_cpuid[srat_num_cpus].phys_id =
        (pa->apic_id << 8) | (pa->local_sapic_eid);
    /* nid should be overridden as logical node id later */
    node_cpuid[srat_num_cpus].nid = pxm;
    cpu_set(srat_num_cpus, early_cpu_possible_map);
    srat_num_cpus++;
}

int __init
acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
{
    unsigned long paddr, size;
    int pxm;
    struct node_memblk_s *p, *q, *pend;

    pxm = get_memory_proximity_domain(ma);

    /* fill node memory chunk structure */
    paddr = ma->base_address;
    size = ma->length;

    /* Ignore disabled entries */
    if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
        return -1;

    /* record this node in proximity bitmap */
    pxm_bit_set(pxm);

    /* Insertion sort based on base address */
    pend = &node_memblk[num_node_memblks];
    for (p = &node_memblk[0]; p < pend; p++) {
        if (paddr < p->start_paddr)
            break;
    }
    if (p < pend) {
        for (q = pend - 1; q >= p; q--)
            *(q + 1) = *q;
    }
    p->start_paddr = paddr;
    p->size = size;
    p->nid = pxm;
    num_node_memblks++;
    return 0;
}

void __init acpi_numa_arch_fixup(void)
{
    int i, j, node_from, node_to;

    /* If there's no SRAT, fix the phys_id and mark node 0 online */
    if (srat_num_cpus == 0) {
        node_set_online(0);
        node_cpuid[0].phys_id = hard_smp_processor_id();
        return;
    }

    /*
     * MCD - This can probably be dropped now.  No need for pxm ID to node ID
     * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
     */
    nodes_clear(node_online_map);
    for (i = 0; i < MAX_PXM_DOMAINS; i++) {
        if (pxm_bit_test(i)) {
            int nid = acpi_map_pxm_to_node(i);
            node_set_online(nid);
        }
    }

    /* set logical node id in memory chunk structure */
    for (i = 0; i < num_node_memblks; i++)
        node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);

    /* assign memory bank numbers for each chunk on each node */
    for_each_online_node(i) {
        int bank;

        bank = 0;
        for (j = 0; j < num_node_memblks; j++)
            if (node_memblk[j].nid == i)
                node_memblk[j].bank = bank++;
    }

    /* set logical node id in cpu structure */
    for_each_possible_early_cpu(i)
        node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);

    printk(KERN_INFO "Number of logical nodes in system = %d\n",
           num_online_nodes());
    printk(KERN_INFO "Number of memory chunks in system = %d\n",
           num_node_memblks);

    if (!slit_table) {
        for (i = 0; i < MAX_NUMNODES; i++)
            for (j = 0; j < MAX_NUMNODES; j++)
                node_distance(i, j) = i == j ? LOCAL_DISTANCE :
                            REMOTE_DISTANCE;
        return;
    }

    memset(numa_slit, -1, sizeof(numa_slit));
    for (i = 0; i < slit_table->locality_count; i++) {
        if (!pxm_bit_test(i))
            continue;
        node_from = pxm_to_node(i);
        for (j = 0; j < slit_table->locality_count; j++) {
            if (!pxm_bit_test(j))
                continue;
            node_to = pxm_to_node(j);
            node_distance(node_from, node_to) =
                slit_table->entry[i * slit_table->locality_count + j];
        }
    }

#ifdef SLIT_DEBUG
    printk("ACPI 2.0 SLIT locality table:\n");
    for_each_online_node(i) {
        for_each_online_node(j)
            printk("%03d ", node_distance(i, j));
        printk("\n");
    }
#endif
}
#endif              /* CONFIG_ACPI_NUMA */

/*
 * success: return IRQ number (>=0)
 * failure: return < 0
 */
int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
{
    if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
        return gsi;

    if (has_8259 && gsi < 16)
        return isa_irq_to_vector(gsi);

    return iosapic_register_intr(gsi,
                     (polarity ==
                      ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
                     IOSAPIC_POL_LOW,
                     (triggering ==
                      ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
                     IOSAPIC_LEVEL);
}

void acpi_unregister_gsi(u32 gsi)
{
    if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
        return;

    if (has_8259 && gsi < 16)
        return;

    iosapic_unregister_intr(gsi);
}

static int __init acpi_parse_fadt(struct acpi_table_header *table)
{
    struct acpi_table_header *fadt_header;
    struct acpi_table_fadt *fadt;

    if (!table)
        return -EINVAL;

    fadt_header = (struct acpi_table_header *)table;
    if (fadt_header->revision != 3)
        return -ENODEV; /* Only deal with ACPI 2.0 FADT */

    fadt = (struct acpi_table_fadt *)fadt_header;

    acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
                 ACPI_ACTIVE_LOW);
    return 0;
}

int __init early_acpi_boot_init(void)
{
    int ret;

    /*
     * do a partial walk of MADT to determine how many CPUs
     * we have including offline CPUs
     */
    if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
        printk(KERN_ERR PREFIX "Can't find MADT\n");
        return 0;
    }

    ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
        acpi_parse_lsapic, NR_CPUS);
    if (ret < 1)
        printk(KERN_ERR PREFIX
               "Error parsing MADT - no LAPIC entries\n");

#ifdef CONFIG_SMP
    if (available_cpus == 0) {
        printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
        printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
        smp_boot_data.cpu_phys_id[available_cpus] =
            hard_smp_processor_id();
        available_cpus = 1; /* We've got at least one of these, no? */
    }
    smp_boot_data.cpu_count = available_cpus;
#endif
    /* Make boot-up look pretty */
    printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
           total_cpus);

    return 0;
}

int __init acpi_boot_init(void)
{

    /*
     * MADT
     * ----
     * Parse the Multiple APIC Description Table (MADT), if exists.
     * Note that this table provides platform SMP configuration
     * information -- the successor to MPS tables.
     */

    if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
        printk(KERN_ERR PREFIX "Can't find MADT\n");
        goto skip_madt;
    }

    /* Local APIC */

    if (acpi_table_parse_madt
        (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
        printk(KERN_ERR PREFIX
               "Error parsing LAPIC address override entry\n");

    if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
        < 0)
        printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");

    /* I/O APIC */

    if (acpi_table_parse_madt
        (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
        if (!ia64_platform_is("sn2"))
            printk(KERN_ERR PREFIX
                   "Error parsing MADT - no IOSAPIC entries\n");
    }

    /* System-Level Interrupt Routing */

    if (acpi_table_parse_madt
        (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
         ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
        printk(KERN_ERR PREFIX
               "Error parsing platform interrupt source entry\n");

    if (acpi_table_parse_madt
        (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
        printk(KERN_ERR PREFIX
               "Error parsing interrupt source overrides entry\n");

    if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
        printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
      skip_madt:

    /*
     * FADT says whether a legacy keyboard controller is present.
     * The FADT also contains an SCI_INT line, by which the system
     * gets interrupts such as power and sleep buttons.  If it's not
     * on a Legacy interrupt, it needs to be setup.
     */
    if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
        printk(KERN_ERR PREFIX "Can't find FADT\n");

#ifdef CONFIG_ACPI_NUMA
#ifdef CONFIG_SMP
    if (srat_num_cpus == 0) {
        int cpu, i = 1;
        for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
            if (smp_boot_data.cpu_phys_id[cpu] !=
                hard_smp_processor_id())
                node_cpuid[i++].phys_id =
                    smp_boot_data.cpu_phys_id[cpu];
    }
#endif
    build_cpu_to_node_map();
#endif
    return 0;
}

int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
{
    int tmp;

    if (has_8259 && gsi < 16)
        *irq = isa_irq_to_vector(gsi);
    else {
        tmp = gsi_to_irq(gsi);
        if (tmp == -1)
            return -1;
        *irq = tmp;
    }
    return 0;
}

int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
{
    if (isa_irq >= 16)
        return -1;
    *gsi = isa_irq;
    return 0;
}

/*
 *  ACPI based hotplug CPU support
 */
#ifdef CONFIG_ACPI_HOTPLUG_CPU
static __cpuinit
int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
{
#ifdef CONFIG_ACPI_NUMA
    int pxm_id;
    int nid;

    pxm_id = acpi_get_pxm(handle);
    /*
     * We don't have cpu-only-node hotadd. But if the system equips
     * SRAT table, pxm is already found and node is ready.
     * So, just pxm_to_nid(pxm) is OK.
     * This code here is for the system which doesn't have full SRAT
     * table for possible cpus.
     */
    nid = acpi_map_pxm_to_node(pxm_id);
    node_cpuid[cpu].phys_id = physid;
    node_cpuid[cpu].nid = nid;
#endif
    return (0);
}

int additional_cpus __initdata = -1;

static __init int setup_additional_cpus(char *s)
{
    if (s)
        additional_cpus = simple_strtol(s, NULL, 0);

    return 0;
}

early_param("additional_cpus", setup_additional_cpus);

/*
 * cpu_possible_mask should be static, it cannot change as CPUs
 * are onlined, or offlined. The reason is per-cpu data-structures
 * are allocated by some modules at init time, and dont expect to
 * do this dynamically on cpu arrival/departure.
 * cpu_present_mask on the other hand can change dynamically.
 * In case when cpu_hotplug is not compiled, then we resort to current
 * behaviour, which is cpu_possible == cpu_present.
 * - Ashok Raj
 *
 * Three ways to find out the number of additional hotplug CPUs:
 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 * - The user can overwrite it with additional_cpus=NUM
 * - Otherwise don't reserve additional CPUs.
 */
__init void prefill_possible_map(void)
{
    int i;
    int possible, disabled_cpus;

    disabled_cpus = total_cpus - available_cpus;

    if (additional_cpus == -1) {
        if (disabled_cpus > 0)
            additional_cpus = disabled_cpus;
        else
            additional_cpus = 0;
    }

    possible = available_cpus + additional_cpus;

    if (possible > nr_cpu_ids)
        possible = nr_cpu_ids;

    printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
        possible, max((possible - available_cpus), 0));

    for (i = 0; i < possible; i++)
        set_cpu_possible(i, true);
}

static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
{
    struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
    union acpi_object *obj;
    struct acpi_madt_local_sapic *lsapic;
    cpumask_t tmp_map;
    int cpu, physid;

    if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
        return -EINVAL;

    if (!buffer.length || !buffer.pointer)
        return -EINVAL;

    obj = buffer.pointer;
    if (obj->type != ACPI_TYPE_BUFFER)
    {
        kfree(buffer.pointer);
        return -EINVAL;
    }

    lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;

    if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
        (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
        kfree(buffer.pointer);
        return -EINVAL;
    }

    physid = ((lsapic->id << 8) | (lsapic->eid));

    kfree(buffer.pointer);
    buffer.length = ACPI_ALLOCATE_BUFFER;
    buffer.pointer = NULL;

    cpumask_complement(&tmp_map, cpu_present_mask);
    cpu = cpumask_first(&tmp_map);
    if (cpu >= nr_cpu_ids)
        return -EINVAL;

    acpi_map_cpu2node(handle, cpu, physid);

    set_cpu_present(cpu, true);
    ia64_cpu_to_sapicid[cpu] = physid;

    acpi_processor_set_pdc(handle);

    *pcpu = cpu;
    return (0);
}

/* wrapper to silence section mismatch warning */
int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
{
    return _acpi_map_lsapic(handle, pcpu);
}
EXPORT_SYMBOL(acpi_map_lsapic);

int acpi_unmap_lsapic(int cpu)
{
    ia64_cpu_to_sapicid[cpu] = -1;
    set_cpu_present(cpu, false);

#ifdef CONFIG_ACPI_NUMA
    /* NUMA specific cleanup's */
#endif

    return (0);
}

EXPORT_SYMBOL(acpi_unmap_lsapic);
#endif              /* CONFIG_ACPI_HOTPLUG_CPU */

#ifdef CONFIG_ACPI_NUMA
static acpi_status __devinit
acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
{
    struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
    union acpi_object *obj;
    struct acpi_madt_io_sapic *iosapic;
    unsigned int gsi_base;
    int pxm, node;

    /* Only care about objects w/ a method that returns the MADT */
    if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
        return AE_OK;

    if (!buffer.length || !buffer.pointer)
        return AE_OK;

    obj = buffer.pointer;
    if (obj->type != ACPI_TYPE_BUFFER ||
        obj->buffer.length < sizeof(*iosapic)) {
        kfree(buffer.pointer);
        return AE_OK;
    }

    iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;

    if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
        kfree(buffer.pointer);
        return AE_OK;
    }

    gsi_base = iosapic->global_irq_base;

    kfree(buffer.pointer);

    /*
     * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
     * us which node to associate this with.
     */
    pxm = acpi_get_pxm(handle);
    if (pxm < 0)
        return AE_OK;

    node = pxm_to_node(pxm);

    if (node >= MAX_NUMNODES || !node_online(node) ||
        cpumask_empty(cpumask_of_node(node)))
        return AE_OK;

    /* We know a gsi to node mapping! */
    map_iosapic_to_node(gsi_base, node);
    return AE_OK;
}

static int __init
acpi_map_iosapics (void)
{
    acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
    return 0;
}

fs_initcall(acpi_map_iosapics);
#endif              /* CONFIG_ACPI_NUMA */

int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
{
    int err;

    if ((err = iosapic_init(phys_addr, gsi_base)))
        return err;

#ifdef CONFIG_ACPI_NUMA
    acpi_map_iosapic(handle, 0, NULL, NULL);
#endif              /* CONFIG_ACPI_NUMA */

    return 0;
}

EXPORT_SYMBOL(acpi_register_ioapic);

int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
{
    return iosapic_remove(gsi_base);
}

EXPORT_SYMBOL(acpi_unregister_ioapic);

/*
 * acpi_suspend_lowlevel() - save kernel state and suspend.
 *
 * TBD when when IA64 starts to support suspend...
 */
int acpi_suspend_lowlevel(void) { return 0; }