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boot.c

/*
 *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
 *
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@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/init.h>
#include <linux/acpi.h>
#include <linux/acpi_pmtmr.h>
#include <linux/efi.h>
#include <linux/cpumask.h>
#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/irq.h>
#include <linux/bootmem.h>
#include <linux/ioport.h>

#include <asm/pgtable.h>
#include <asm/io_apic.h>
#include <asm/apic.h>
#include <asm/io.h>
#include <asm/mpspec.h>

static int __initdata acpi_force = 0;

#ifdef      CONFIG_ACPI
int acpi_disabled = 0;
#else
int acpi_disabled = 1;
#endif
EXPORT_SYMBOL(acpi_disabled);

#ifdef      CONFIG_X86_64

#include <asm/proto.h>

static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return 0; }


#else                   /* X86 */

#ifdef      CONFIG_X86_LOCAL_APIC
#include <mach_apic.h>
#include <mach_mpparse.h>
#endif                        /* CONFIG_X86_LOCAL_APIC */

#endif                        /* X86 */

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

#define PREFIX                "ACPI: "

int acpi_noirq;                     /* skip ACPI IRQ initialization */
int acpi_pci_disabled __initdata;   /* skip ACPI PCI scan and IRQ initialization */
int acpi_ht __initdata = 1;   /* enable HT */

int acpi_lapic;
int acpi_ioapic;
int acpi_strict;
EXPORT_SYMBOL(acpi_strict);

u8 acpi_sci_flags __initdata;
int acpi_sci_override_gsi __initdata;
int acpi_skip_timer_override __initdata;
int acpi_use_timer_override __initdata;

#ifdef CONFIG_X86_LOCAL_APIC
static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
#endif

#ifndef __HAVE_ARCH_CMPXCHG
#warning ACPI uses CMPXCHG, i486 and later hardware
#endif

/* --------------------------------------------------------------------------
                              Boot-time Configuration
   -------------------------------------------------------------------------- */

/*
 * The default interrupt routing model is PIC (8259).  This gets
 * overridden if IOAPICs are enumerated (below).
 */
enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;

#ifdef      CONFIG_X86_64

/* rely on all ACPI tables being in the direct mapping */
char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
{
      if (!phys_addr || !size)
            return NULL;

      if (phys_addr+size <= (end_pfn_map << PAGE_SHIFT) + PAGE_SIZE)
            return __va(phys_addr);

      return NULL;
}

#else

/*
 * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
 * to map the target physical address. The problem is that set_fixmap()
 * provides a single page, and it is possible that the page is not
 * sufficient.
 * By using this area, we can map up to MAX_IO_APICS pages temporarily,
 * i.e. until the next __va_range() call.
 *
 * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
 * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
 * count idx down while incrementing the phys address.
 */
char *__acpi_map_table(unsigned long phys, unsigned long size)
{
      unsigned long base, offset, mapped_size;
      int idx;

      if (phys + size < 8 * 1024 * 1024)
            return __va(phys);

      offset = phys & (PAGE_SIZE - 1);
      mapped_size = PAGE_SIZE - offset;
      set_fixmap(FIX_ACPI_END, phys);
      base = fix_to_virt(FIX_ACPI_END);

      /*
       * Most cases can be covered by the below.
       */
      idx = FIX_ACPI_END;
      while (mapped_size < size) {
            if (--idx < FIX_ACPI_BEGIN)
                  return NULL;      /* cannot handle this */
            phys += PAGE_SIZE;
            set_fixmap(idx, phys);
            mapped_size += PAGE_SIZE;
      }

      return ((unsigned char *)base + offset);
}
#endif

#ifdef CONFIG_PCI_MMCONFIG
/* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
struct acpi_mcfg_allocation *pci_mmcfg_config;
int pci_mmcfg_config_num;

int __init acpi_parse_mcfg(struct acpi_table_header *header)
{
      struct acpi_table_mcfg *mcfg;
      unsigned long i;
      int config_size;

      if (!header)
            return -EINVAL;

      mcfg = (struct acpi_table_mcfg *)header;

      /* how many config structures do we have */
      pci_mmcfg_config_num = 0;
      i = header->length - sizeof(struct acpi_table_mcfg);
      while (i >= sizeof(struct acpi_mcfg_allocation)) {
            ++pci_mmcfg_config_num;
            i -= sizeof(struct acpi_mcfg_allocation);
      };
      if (pci_mmcfg_config_num == 0) {
            printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
            return -ENODEV;
      }

      config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
      pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
      if (!pci_mmcfg_config) {
            printk(KERN_WARNING PREFIX
                   "No memory for MCFG config tables\n");
            return -ENOMEM;
      }

      memcpy(pci_mmcfg_config, &mcfg[1], config_size);
      for (i = 0; i < pci_mmcfg_config_num; ++i) {
            if (pci_mmcfg_config[i].address > 0xFFFFFFFF) {
                  printk(KERN_ERR PREFIX
                         "MMCONFIG not in low 4GB of memory\n");
                  kfree(pci_mmcfg_config);
                  pci_mmcfg_config_num = 0;
                  return -ENODEV;
            }
      }

      return 0;
}
#endif                        /* CONFIG_PCI_MMCONFIG */

#ifdef CONFIG_X86_LOCAL_APIC
static int __init acpi_parse_madt(struct acpi_table_header *table)
{
      struct acpi_table_madt *madt = NULL;

      if (!cpu_has_apic)
            return -EINVAL;

      madt = (struct acpi_table_madt *)table;
      if (!madt) {
            printk(KERN_WARNING PREFIX "Unable to map MADT\n");
            return -ENODEV;
      }

      if (madt->address) {
            acpi_lapic_addr = (u64) madt->address;

            printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
                   madt->address);
      }

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

      return 0;
}

static int __init
acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
{
      struct acpi_madt_local_apic *processor = NULL;

      processor = (struct acpi_madt_local_apic *)header;

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

      acpi_table_print_madt_entry(header);

      /*
       * We need to register disabled CPU as well to permit
       * counting disabled CPUs. This allows us to size
       * cpus_possible_map more accurately, to permit
       * to not preallocating memory for all NR_CPUS
       * when we use CPU hotplug.
       */
      mp_register_lapic(processor->id,    /* APIC ID */
                    processor->lapic_flags & ACPI_MADT_ENABLED);  /* Enabled? */

      return 0;
}

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

      lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;

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

      acpi_lapic_addr = lapic_addr_ovr->address;

      return 0;
}

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

      lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;

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

      acpi_table_print_madt_entry(header);

      if (lapic_nmi->lint != 1)
            printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");

      return 0;
}

#endif                        /*CONFIG_X86_LOCAL_APIC */

#ifdef CONFIG_X86_IO_APIC

static int __init
acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
{
      struct acpi_madt_io_apic *ioapic = NULL;

      ioapic = (struct acpi_madt_io_apic *)header;

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

      acpi_table_print_madt_entry(header);

      mp_register_ioapic(ioapic->id,
                     ioapic->address, ioapic->global_irq_base);

      return 0;
}

/*
 * Parse Interrupt Source Override for the ACPI SCI
 */
static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
{
      if (trigger == 0) /* compatible SCI trigger is level */
            trigger = 3;

      if (polarity == 0)      /* compatible SCI polarity is low */
            polarity = 3;

      /* Command-line over-ride via acpi_sci= */
      if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
            trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;

      if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
            polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;

      /*
       * mp_config_acpi_legacy_irqs() already setup IRQs < 16
       * If GSI is < 16, this will update its flags,
       * else it will create a new mp_irqs[] entry.
       */
      mp_override_legacy_irq(gsi, polarity, trigger, gsi);

      /*
       * stash over-ride to indicate we've been here
       * and for later update of acpi_gbl_FADT
       */
      acpi_sci_override_gsi = gsi;
      return;
}

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

      intsrc = (struct acpi_madt_interrupt_override *)header;

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

      acpi_table_print_madt_entry(header);

      if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
            acpi_sci_ioapic_setup(intsrc->global_irq,
                              intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
                              (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
            return 0;
      }

      if (acpi_skip_timer_override &&
          intsrc->source_irq == 0 && intsrc->global_irq == 2) {
            printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
            return 0;
      }

      mp_override_legacy_irq(intsrc->source_irq,
                        intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
                        (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
                        intsrc->global_irq);

      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 = NULL;

      nmi_src = (struct acpi_madt_nmi_source *)header;

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

      acpi_table_print_madt_entry(header);

      /* TBD: Support nimsrc entries? */

      return 0;
}

#endif                        /* CONFIG_X86_IO_APIC */

/*
 * acpi_pic_sci_set_trigger()
 *
 * use ELCR to set PIC-mode trigger type for SCI
 *
 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 * it may require Edge Trigger -- use "acpi_sci=edge"
 *
 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
 */

void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
{
      unsigned int mask = 1 << irq;
      unsigned int old, new;

      /* Real old ELCR mask */
      old = inb(0x4d0) | (inb(0x4d1) << 8);

      /*
       * If we use ACPI to set PCI IRQs, then we should clear ELCR
       * since we will set it correctly as we enable the PCI irq
       * routing.
       */
      new = acpi_noirq ? old : 0;

      /*
       * Update SCI information in the ELCR, it isn't in the PCI
       * routing tables..
       */
      switch (trigger) {
      case 1:           /* Edge - clear */
            new &= ~mask;
            break;
      case 3:           /* Level - set */
            new |= mask;
            break;
      }

      if (old == new)
            return;

      printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
      outb(new, 0x4d0);
      outb(new >> 8, 0x4d1);
}

int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
{
      *irq = gsi;
      return 0;
}

/*
 * success: return IRQ number (>=0)
 * failure: return < 0
 */
int acpi_register_gsi(u32 gsi, int triggering, int polarity)
{
      unsigned int irq;
      unsigned int plat_gsi = gsi;

#ifdef CONFIG_PCI
      /*
       * Make sure all (legacy) PCI IRQs are set as level-triggered.
       */
      if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
            extern void eisa_set_level_irq(unsigned int irq);

            if (triggering == ACPI_LEVEL_SENSITIVE)
                  eisa_set_level_irq(gsi);
      }
#endif

#ifdef CONFIG_X86_IO_APIC
      if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
            plat_gsi = mp_register_gsi(gsi, triggering, polarity);
      }
#endif
      acpi_gsi_to_irq(plat_gsi, &irq);
      return irq;
}

EXPORT_SYMBOL(acpi_register_gsi);

/*
 *  ACPI based hotplug support for CPU
 */
#ifdef CONFIG_ACPI_HOTPLUG_CPU
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_apic *lapic;
      cpumask_t tmp_map, new_map;
      u8 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 ||
          obj->buffer.length < sizeof(*lapic)) {
            kfree(buffer.pointer);
            return -EINVAL;
      }

      lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;

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

      physid = lapic->id;

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

      tmp_map = cpu_present_map;
      mp_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);

      /*
       * If mp_register_lapic successfully generates a new logical cpu
       * number, then the following will get us exactly what was mapped
       */
      cpus_andnot(new_map, cpu_present_map, tmp_map);
      if (cpus_empty(new_map)) {
            printk ("Unable to map lapic to logical cpu number\n");
            return -EINVAL;
      }

      cpu = first_cpu(new_map);

      *pcpu = cpu;
      return 0;
}

EXPORT_SYMBOL(acpi_map_lsapic);

int acpi_unmap_lsapic(int cpu)
{
      per_cpu(x86_cpu_to_apicid, cpu) = -1;
      cpu_clear(cpu, cpu_present_map);
      num_processors--;

      return (0);
}

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

int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
{
      /* TBD */
      return -EINVAL;
}

EXPORT_SYMBOL(acpi_register_ioapic);

int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
{
      /* TBD */
      return -EINVAL;
}

EXPORT_SYMBOL(acpi_unregister_ioapic);

static unsigned long __init
acpi_scan_rsdp(unsigned long start, unsigned long length)
{
      unsigned long offset = 0;
      unsigned long sig_len = sizeof("RSD PTR ") - 1;

      /*
       * Scan all 16-byte boundaries of the physical memory region for the
       * RSDP signature.
       */
      for (offset = 0; offset < length; offset += 16) {
            if (strncmp((char *)(phys_to_virt(start) + offset), "RSD PTR ", sig_len))
                  continue;
            return (start + offset);
      }

      return 0;
}

static int __init acpi_parse_sbf(struct acpi_table_header *table)
{
      struct acpi_table_boot *sb;

      sb = (struct acpi_table_boot *)table;
      if (!sb) {
            printk(KERN_WARNING PREFIX "Unable to map SBF\n");
            return -ENODEV;
      }

      sbf_port = sb->cmos_index;    /* Save CMOS port */

      return 0;
}

#ifdef CONFIG_HPET_TIMER
#include <asm/hpet.h>

static struct __initdata resource *hpet_res;

static int __init acpi_parse_hpet(struct acpi_table_header *table)
{
      struct acpi_table_hpet *hpet_tbl;

      hpet_tbl = (struct acpi_table_hpet *)table;
      if (!hpet_tbl) {
            printk(KERN_WARNING PREFIX "Unable to map HPET\n");
            return -ENODEV;
      }

      if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
            printk(KERN_WARNING PREFIX "HPET timers must be located in "
                   "memory.\n");
            return -1;
      }

      hpet_address = hpet_tbl->address.address;

      /*
       * Some broken BIOSes advertise HPET at 0x0. We really do not
       * want to allocate a resource there.
       */
      if (!hpet_address) {
            printk(KERN_WARNING PREFIX
                   "HPET id: %#x base: %#lx is invalid\n",
                   hpet_tbl->id, hpet_address);
            return 0;
      }
#ifdef CONFIG_X86_64
      /*
       * Some even more broken BIOSes advertise HPET at
       * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
       * some noise:
       */
      if (hpet_address == 0xfed0000000000000UL) {
            if (!hpet_force_user) {
                  printk(KERN_WARNING PREFIX "HPET id: %#x "
                         "base: 0xfed0000000000000 is bogus\n "
                         "try hpet=force on the kernel command line to "
                         "fix it up to 0xfed00000.\n", hpet_tbl->id);
                  hpet_address = 0;
                  return 0;
            }
            printk(KERN_WARNING PREFIX
                   "HPET id: %#x base: 0xfed0000000000000 fixed up "
                   "to 0xfed00000.\n", hpet_tbl->id);
            hpet_address >>= 32;
      }
#endif
      printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
             hpet_tbl->id, hpet_address);

      /*
       * Allocate and initialize the HPET firmware resource for adding into
       * the resource tree during the lateinit timeframe.
       */
#define HPET_RESOURCE_NAME_SIZE 9
      hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);

      if (!hpet_res)
            return 0;

      memset(hpet_res, 0, sizeof(*hpet_res));
      hpet_res->name = (void *)&hpet_res[1];
      hpet_res->flags = IORESOURCE_MEM;
      snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
             hpet_tbl->sequence);

      hpet_res->start = hpet_address;
      hpet_res->end = hpet_address + (1 * 1024) - 1;

      return 0;
}

/*
 * hpet_insert_resource inserts the HPET resources used into the resource
 * tree.
 */
static __init int hpet_insert_resource(void)
{
      if (!hpet_res)
            return 1;

      return insert_resource(&iomem_resource, hpet_res);
}

late_initcall(hpet_insert_resource);

#else
#define     acpi_parse_hpet   NULL
#endif

static int __init acpi_parse_fadt(struct acpi_table_header *table)
{

#ifdef CONFIG_X86_PM_TIMER
      /* detect the location of the ACPI PM Timer */
      if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
            /* FADT rev. 2 */
            if (acpi_gbl_FADT.xpm_timer_block.space_id !=
                ACPI_ADR_SPACE_SYSTEM_IO)
                  return 0;

            pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
            /*
             * "X" fields are optional extensions to the original V1.0
             * fields, so we must selectively expand V1.0 fields if the
             * corresponding X field is zero.
             */
            if (!pmtmr_ioport)
                  pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
      } else {
            /* FADT rev. 1 */
            pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
      }
      if (pmtmr_ioport)
            printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
                   pmtmr_ioport);
#endif
      return 0;
}

unsigned long __init acpi_find_rsdp(void)
{
      unsigned long rsdp_phys = 0;

      if (efi_enabled) {
            if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
                  return efi.acpi20;
            else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
                  return efi.acpi;
      }
      /*
       * Scan memory looking for the RSDP signature. First search EBDA (low
       * memory) paragraphs and then search upper memory (E0000-FFFFF).
       */
      rsdp_phys = acpi_scan_rsdp(0, 0x400);
      if (!rsdp_phys)
            rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);

      return rsdp_phys;
}

#ifdef      CONFIG_X86_LOCAL_APIC
/*
 * Parse LAPIC entries in MADT
 * returns 0 on success, < 0 on error
 */
static int __init acpi_parse_madt_lapic_entries(void)
{
      int count;

      if (!cpu_has_apic)
            return -ENODEV;

      /*
       * Note that the LAPIC address is obtained from the MADT (32-bit value)
       * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
       */

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

      mp_register_lapic_address(acpi_lapic_addr);

      count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC, acpi_parse_lapic,
                              MAX_APICS);
      if (!count) {
            printk(KERN_ERR PREFIX "No LAPIC entries present\n");
            /* TBD: Cleanup to allow fallback to MPS */
            return -ENODEV;
      } else if (count < 0) {
            printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
            /* TBD: Cleanup to allow fallback to MPS */
            return count;
      }

      count =
          acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
      if (count < 0) {
            printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
            /* TBD: Cleanup to allow fallback to MPS */
            return count;
      }
      return 0;
}
#endif                        /* CONFIG_X86_LOCAL_APIC */

#ifdef      CONFIG_X86_IO_APIC
/*
 * Parse IOAPIC related entries in MADT
 * returns 0 on success, < 0 on error
 */
static int __init acpi_parse_madt_ioapic_entries(void)
{
      int count;

      /*
       * ACPI interpreter is required to complete interrupt setup,
       * so if it is off, don't enumerate the io-apics with ACPI.
       * If MPS is present, it will handle them,
       * otherwise the system will stay in PIC mode
       */
      if (acpi_disabled || acpi_noirq) {
            return -ENODEV;
      }

      if (!cpu_has_apic)
            return -ENODEV;

      /*
       * if "noapic" boot option, don't look for IO-APICs
       */
      if (skip_ioapic_setup) {
            printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
                   "due to 'noapic' option.\n");
            return -ENODEV;
      }

      count =
          acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
                          MAX_IO_APICS);
      if (!count) {
            printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
            return -ENODEV;
      } else if (count < 0) {
            printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
            return count;
      }

      count =
          acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
                          NR_IRQ_VECTORS);
      if (count < 0) {
            printk(KERN_ERR PREFIX
                   "Error parsing interrupt source overrides entry\n");
            /* TBD: Cleanup to allow fallback to MPS */
            return count;
      }

      /*
       * If BIOS did not supply an INT_SRC_OVR for the SCI
       * pretend we got one so we can set the SCI flags.
       */
      if (!acpi_sci_override_gsi)
            acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);

      /* Fill in identity legacy mapings where no override */
      mp_config_acpi_legacy_irqs();

      count =
          acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
                          NR_IRQ_VECTORS);
      if (count < 0) {
            printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
            /* TBD: Cleanup to allow fallback to MPS */
            return count;
      }

      return 0;
}
#else
static inline int acpi_parse_madt_ioapic_entries(void)
{
      return -1;
}
#endif      /* !CONFIG_X86_IO_APIC */

static void __init acpi_process_madt(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
      int error;

      if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {

            /*
             * Parse MADT LAPIC entries
             */
            error = acpi_parse_madt_lapic_entries();
            if (!error) {
                  acpi_lapic = 1;

#ifdef CONFIG_X86_GENERICARCH
                  generic_bigsmp_probe();
#endif
                  /*
                   * Parse MADT IO-APIC entries
                   */
                  error = acpi_parse_madt_ioapic_entries();
                  if (!error) {
                        acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
                        acpi_irq_balance_set(NULL);
                        acpi_ioapic = 1;

                        smp_found_config = 1;
                        setup_apic_routing();
                  }
            }
            if (error == -EINVAL) {
                  /*
                   * Dell Precision Workstation 410, 610 come here.
                   */
                  printk(KERN_ERR PREFIX
                         "Invalid BIOS MADT, disabling ACPI\n");
                  disable_acpi();
            }
      }
#endif
      return;
}

#ifdef __i386__

static int __init disable_acpi_irq(const struct dmi_system_id *d)
{
      if (!acpi_force) {
            printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
                   d->ident);
            acpi_noirq_set();
      }
      return 0;
}

static int __init disable_acpi_pci(const struct dmi_system_id *d)
{
      if (!acpi_force) {
            printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
                   d->ident);
            acpi_disable_pci();
      }
      return 0;
}

static int __init dmi_disable_acpi(const struct dmi_system_id *d)
{
      if (!acpi_force) {
            printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
            disable_acpi();
      } else {
            printk(KERN_NOTICE
                   "Warning: DMI blacklist says broken, but acpi forced\n");
      }
      return 0;
}

/*
 * Limit ACPI to CPU enumeration for HT
 */
static int __init force_acpi_ht(const struct dmi_system_id *d)
{
      if (!acpi_force) {
            printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
                   d->ident);
            disable_acpi();
            acpi_ht = 1;
      } else {
            printk(KERN_NOTICE
                   "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
      }
      return 0;
}

/*
 * If your system is blacklisted here, but you find that acpi=force
 * works for you, please contact acpi-devel@sourceforge.net
 */
static struct dmi_system_id __initdata acpi_dmi_table[] = {
      /*
       * Boxes that need ACPI disabled
       */
      {
       .callback = dmi_disable_acpi,
       .ident = "IBM Thinkpad",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
                 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
                 },
       },

      /*
       * Boxes that need acpi=ht
       */
      {
       .callback = force_acpi_ht,
       .ident = "FSC Primergy T850",
       .matches = {
                 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
                 DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
                 },
       },
      {
       .callback = force_acpi_ht,
       .ident = "HP VISUALIZE NT Workstation",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
                 DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
                 },
       },
      {
       .callback = force_acpi_ht,
       .ident = "Compaq Workstation W8000",
       .matches = {
                 DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
                 DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
                 },
       },
      {
       .callback = force_acpi_ht,
       .ident = "ASUS P4B266",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
                 DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
                 },
       },
      {
       .callback = force_acpi_ht,
       .ident = "ASUS P2B-DS",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
                 DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
                 },
       },
      {
       .callback = force_acpi_ht,
       .ident = "ASUS CUR-DLS",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
                 DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
                 },
       },
      {
       .callback = force_acpi_ht,
       .ident = "ABIT i440BX-W83977",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
                 DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
                 },
       },
      {
       .callback = force_acpi_ht,
       .ident = "IBM Bladecenter",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
                 DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
                 },
       },
      {
       .callback = force_acpi_ht,
       .ident = "IBM eServer xSeries 360",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
                 DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
                 },
       },
      {
       .callback = force_acpi_ht,
       .ident = "IBM eserver xSeries 330",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
                 DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
                 },
       },
      {
       .callback = force_acpi_ht,
       .ident = "IBM eserver xSeries 440",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
                 DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
                 },
       },

      /*
       * Boxes that need ACPI PCI IRQ routing disabled
       */
      {
       .callback = disable_acpi_irq,
       .ident = "ASUS A7V",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
                 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
                 /* newer BIOS, Revision 1011, does work */
                 DMI_MATCH(DMI_BIOS_VERSION,
                         "ASUS A7V ACPI BIOS Revision 1007"),
                 },
       },
      {
            /*
             * Latest BIOS for IBM 600E (1.16) has bad pcinum
             * for LPC bridge, which is needed for the PCI
             * interrupt links to work. DSDT fix is in bug 5966.
             * 2645, 2646 model numbers are shared with 600/600E/600X
             */
       .callback = disable_acpi_irq,
       .ident = "IBM Thinkpad 600 Series 2645",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
                 DMI_MATCH(DMI_BOARD_NAME, "2645"),
                 },
       },
      {
       .callback = disable_acpi_irq,
       .ident = "IBM Thinkpad 600 Series 2646",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
                 DMI_MATCH(DMI_BOARD_NAME, "2646"),
                 },
       },
      /*
       * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
       */
      {                 /* _BBN 0 bug */
       .callback = disable_acpi_pci,
       .ident = "ASUS PR-DLS",
       .matches = {
                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
                 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
                 DMI_MATCH(DMI_BIOS_VERSION,
                         "ASUS PR-DLS ACPI BIOS Revision 1010"),
                 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
                 },
       },
      {
       .callback = disable_acpi_pci,
       .ident = "Acer TravelMate 36x Laptop",
       .matches = {
                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
                 },
       },
      {}
};

#endif                        /* __i386__ */

/*
 * acpi_boot_table_init() and acpi_boot_init()
 *  called from setup_arch(), always.
 *    1. checksums all tables
 *    2. enumerates lapics
 *    3. enumerates io-apics
 *
 * acpi_table_init() is separate to allow reading SRAT without
 * other side effects.
 *
 * side effects of acpi_boot_init:
 *    acpi_lapic = 1 if LAPIC found
 *    acpi_ioapic = 1 if IOAPIC found
 *    if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
 *    if acpi_blacklisted() acpi_disabled = 1;
 *    acpi_irq_model=...
 *    ...
 *
 * return value: (currently ignored)
 *    0: success
 *    !0: failure
 */

int __init acpi_boot_table_init(void)
{
      int error;

#ifdef __i386__
      dmi_check_system(acpi_dmi_table);
#endif

      /*
       * If acpi_disabled, bail out
       * One exception: acpi=ht continues far enough to enumerate LAPICs
       */
      if (acpi_disabled && !acpi_ht)
            return 1;

      /*
       * Initialize the ACPI boot-time table parser.
       */
      error = acpi_table_init();
      if (error) {
            disable_acpi();
            return error;
      }

      acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);

      /*
       * blacklist may disable ACPI entirely
       */
      error = acpi_blacklisted();
      if (error) {
            if (acpi_force) {
                  printk(KERN_WARNING PREFIX "acpi=force override\n");
            } else {
                  printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
                  disable_acpi();
                  return error;
            }
      }

      return 0;
}

int __init acpi_boot_init(void)
{
      /*
       * If acpi_disabled, bail out
       * One exception: acpi=ht continues far enough to enumerate LAPICs
       */
      if (acpi_disabled && !acpi_ht)
            return 1;

      acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);

      /*
       * set sci_int and PM timer address
       */
      acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);

      /*
       * Process the Multiple APIC Description Table (MADT), if present
       */
      acpi_process_madt();

      acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);

      return 0;
}

static int __init parse_acpi(char *arg)
{
      if (!arg)
            return -EINVAL;

      /* "acpi=off" disables both ACPI table parsing and interpreter */
      if (strcmp(arg, "off") == 0) {
            disable_acpi();
      }
      /* acpi=force to over-ride black-list */
      else if (strcmp(arg, "force") == 0) {
            acpi_force = 1;
            acpi_ht = 1;
            acpi_disabled = 0;
      }
      /* acpi=strict disables out-of-spec workarounds */
      else if (strcmp(arg, "strict") == 0) {
            acpi_strict = 1;
      }
      /* Limit ACPI just to boot-time to enable HT */
      else if (strcmp(arg, "ht") == 0) {
            if (!acpi_force)
                  disable_acpi();
            acpi_ht = 1;
      }
      /* "acpi=noirq" disables ACPI interrupt routing */
      else if (strcmp(arg, "noirq") == 0) {
            acpi_noirq_set();
      } else {
            /* Core will printk when we return error. */
            return -EINVAL;
      }
      return 0;
}
early_param("acpi", parse_acpi);

/* FIXME: Using pci= for an ACPI parameter is a travesty. */
static int __init parse_pci(char *arg)
{
      if (arg && strcmp(arg, "noacpi") == 0)
            acpi_disable_pci();
      return 0;
}
early_param("pci", parse_pci);

#ifdef CONFIG_X86_IO_APIC
static int __init parse_acpi_skip_timer_override(char *arg)
{
      acpi_skip_timer_override = 1;
      return 0;
}
early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);

static int __init parse_acpi_use_timer_override(char *arg)
{
      acpi_use_timer_override = 1;
      return 0;
}
early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
#endif /* CONFIG_X86_IO_APIC */

static int __init setup_acpi_sci(char *s)
{
      if (!s)
            return -EINVAL;
      if (!strcmp(s, "edge"))
            acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
                  (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
      else if (!strcmp(s, "level"))
            acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
                  (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
      else if (!strcmp(s, "high"))
            acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
                  (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
      else if (!strcmp(s, "low"))
            acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
                  (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
      else
            return -EINVAL;
      return 0;
}
early_param("acpi_sci", setup_acpi_sci);

int __acpi_acquire_global_lock(unsigned int *lock)
{
      unsigned int old, new, val;
      do {
            old = *lock;
            new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
            val = cmpxchg(lock, old, new);
      } while (unlikely (val != old));
      return (new < 3) ? -1 : 0;
}

int __acpi_release_global_lock(unsigned int *lock)
{
      unsigned int old, new, val;
      do {
            old = *lock;
            new = old & ~0x3;
            val = cmpxchg(lock, old, new);
      } while (unlikely (val != old));
      return old & 0x1;
}

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