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acpi.c

/*
 *  acpi.c - Architecture-Specific Low-Level ACPI Support
 *
 *  Copyright (C) 1999 VA Linux Systems
 *  Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
 *  Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
 *    David Mosberger-Tang <davidm@hpl.hp.com>
 *  Copyright (C) 2000 Intel Corp.
 *  Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
 *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
 *  Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
 *  Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
 *  Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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 <asm/io.h>
#include <asm/iosapic.h>
#include <asm/machvec.h>
#include <asm/page.h>
#include <asm/system.h>
#include <asm/numa.h>
#include <asm/sal.h>
#include <asm/cyclone.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: "

void (*pm_idle) (void);
EXPORT_SYMBOL(pm_idle);
void (*pm_power_off) (void);
EXPORT_SYMBOL(pm_power_off);

unsigned int acpi_cpei_override;
unsigned int acpi_cpei_phys_cpuid;

unsigned long acpi_wakeup_address = 0;

const char __init *
acpi_get_sysname(void)
{
#ifdef CONFIG_IA64_GENERIC
      unsigned long rsdp_phys;
      struct acpi_table_rsdp *rsdp;
      struct acpi_table_xsdt *xsdt;
      struct acpi_table_header *hdr;

      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")) {
            return "sn2";
      }

      return "dig";
#else
# if defined (CONFIG_IA64_HP_SIM)
      return "hpsim";
# elif defined (CONFIG_IA64_HP_ZX1)
      return "hpzx1";
# elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
      return "hpzx1_swiotlb";
# elif defined (CONFIG_IA64_SGI_SN2)
      return "sn2";
# elif defined (CONFIG_IA64_DIG)
      return "dig";
# else
#     error Unknown platform.  Fix acpi.c.
# endif
#endif
}

#ifdef CONFIG_ACPI

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

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

static int total_cpus __initdata;
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_HIGH) ?
                         IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
                         ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
                         ACPI_MADT_TRIGGER_EDGE) ?
                         IOSAPIC_EDGE : IOSAPIC_LEVEL);
      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;

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

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

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

      pxm = ma->proximity_domain;
      if (!ia64_platform_is("sn2"))
            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);
            memset(numa_slit, 10, sizeof(numa_slit));
            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;

      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;
      srat_num_cpus++;
}

void __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;

      /* 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++;
}

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 (i = 0; i < srat_num_cpus; 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)
            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(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);
}

EXPORT_SYMBOL(acpi_register_gsi);

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

      iosapic_unregister_intr(gsi);
}

EXPORT_SYMBOL(acpi_unregister_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(fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
      return 0;
}

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;
}

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_SAPIC, acpi_parse_lsapic, NR_CPUS)
          < 1)
            printk(KERN_ERR PREFIX
                   "Error parsing MADT - no LAPIC entries\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_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;

      smp_build_cpu_map();
# ifdef CONFIG_ACPI_NUMA
      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
#endif
#ifdef CONFIG_ACPI_NUMA
      build_cpu_to_node_map();
#endif
      /* Make boot-up look pretty */
      printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
             total_cpus);
      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;
}

/*
 *  ACPI based hotplug CPU support
 */
#ifdef CONFIG_ACPI_HOTPLUG_CPU
static
int acpi_map_cpu2node(acpi_handle handle, int cpu, long 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_map 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_map 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_CPUS)
            possible = NR_CPUS;

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

      for (i = 0; i < possible; i++)
            cpu_set(i, cpu_possible_map);
}

int 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;
      long physid;
      int cpu;

      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;

      cpus_complement(tmp_map, cpu_present_map);
      cpu = first_cpu(tmp_map);
      if (cpu >= NR_CPUS)
            return -EINVAL;

      acpi_map_cpu2node(handle, cpu, physid);

      cpu_set(cpu, cpu_present_map);
      ia64_cpu_to_sapicid[cpu] = physid;

      *pcpu = cpu;
      return (0);
}

EXPORT_SYMBOL(acpi_map_lsapic);

int acpi_unmap_lsapic(int cpu)
{
      ia64_cpu_to_sapicid[cpu] = -1;
      cpu_clear(cpu, cpu_present_map);

#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) ||
          cpus_empty(node_to_cpumask(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 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_save_state_mem() - save kernel state
 *
 * TBD when when IA64 starts to support suspend...
 */
int acpi_save_state_mem(void) { return 0; } 

/*
 * acpi_restore_state()
 */
void acpi_restore_state_mem(void) {}

/*
 * do_suspend_lowlevel()
 */
void do_suspend_lowlevel(void) {}

#endif                        /* CONFIG_ACPI */

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