/*
 *  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 <linux/pci.h>

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

static int __initdata acpi_force = 0;
u32 acpi_rsdt_forced;
int acpi_disabled;
EXPORT_SYMBOL(acpi_disabled);

#ifdef  CONFIG_X86_64
# include <asm/proto.h>
#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;          /* skip ACPI PCI scan and IRQ initialization */
EXPORT_SYMBOL(acpi_pci_disabled);
int acpi_ht __initdata = 1;     /* enable HT */

int acpi_lapic;
int acpi_ioapic;
int 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;


/*
 * 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 *__init __acpi_map_table(unsigned long phys, unsigned long size)
{

        if (!phys || !size)
                return NULL;

        return early_ioremap(phys, size);
}
void __init __acpi_unmap_table(char *map, unsigned long size)
{
        if (!map || !size)
                return;

        early_iounmap(map, size);
}

#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);
        }

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

        return 0;
}

static void __cpuinit acpi_register_lapic(int id, u8 enabled)
{
        unsigned int ver = 0;

        if (!enabled) {
                ++disabled_cpus;
                return;
        }

        if (boot_cpu_physical_apicid != -1U)
                ver = apic_version[boot_cpu_physical_apicid];

        generic_processor_info(id, ver);
}

static int __init
acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
{
        struct acpi_madt_local_x2apic *processor = NULL;

        processor = (struct acpi_madt_local_x2apic *)header;

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

        acpi_table_print_madt_entry(header);

#ifdef CONFIG_X86_X2APIC
        /*
         * 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.
         */
        acpi_register_lapic(processor->local_apic_id,   /* APIC ID */
                            processor->lapic_flags & ACPI_MADT_ENABLED);
#else
        printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
#endif

        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.
         */
        acpi_register_lapic(processor->id,      /* APIC ID */
                            processor->lapic_flags & ACPI_MADT_ENABLED);

        return 0;
}

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

        processor = (struct acpi_madt_local_sapic *)header;

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

        acpi_table_print_madt_entry(header);

        acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
                            processor->lapic_flags & ACPI_MADT_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_x2apic_nmi(struct acpi_subtable_header *header,
                      const unsigned long end)
{
        struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;

        x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;

        if (BAD_MADT_ENTRY(x2apic_nmi, end))
                return -EINVAL;

        acpi_table_print_madt_entry(header);

        if (x2apic_nmi->lint != 1)
                printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");

        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(struct device *dev, u32 gsi, int trigger, 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) {
                if (trigger == 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(dev, gsi, trigger, polarity);
        }
#endif
        acpi_gsi_to_irq(plat_gsi, &irq);
        return irq;
}

/*
 *  ACPI based hotplug support for CPU
 */
#ifdef CONFIG_ACPI_HOTPLUG_CPU

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_apic *lapic;
        cpumask_var_t tmp_map, new_map;
        u8 physid;
        int cpu;
        int retval = -ENOMEM;

        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;

        if (!alloc_cpumask_var(&tmp_map, GFP_KERNEL))
                goto out;

        if (!alloc_cpumask_var(&new_map, GFP_KERNEL))
                goto free_tmp_map;

        cpumask_copy(tmp_map, cpu_present_mask);
        acpi_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
         */
        cpumask_andnot(new_map, cpu_present_mask, tmp_map);
        if (cpumask_empty(new_map)) {
                printk ("Unable to map lapic to logical cpu number\n");
                retval = -EINVAL;
                goto free_new_map;
        }

        cpu = cpumask_first(new_map);

        *pcpu = cpu;
        retval = 0;

free_new_map:
        free_cpumask_var(new_map);
free_tmp_map:
        free_cpumask_var(tmp_map);
out:
        return retval;
}

/* 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)
{
        per_cpu(x86_cpu_to_apicid, cpu) = -1;
        set_cpu_present(cpu, false);
        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 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);

        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;
}

#ifdef  CONFIG_X86_LOCAL_APIC
/*
 * Parse LAPIC entries in MADT
 * returns 0 on success, < 0 on error
 */

static void __init acpi_register_lapic_address(unsigned long address)
{
        mp_lapic_addr = address;

        set_fixmap_nocache(FIX_APIC_BASE, address);
        if (boot_cpu_physical_apicid == -1U) {
                boot_cpu_physical_apicid  = read_apic_id();
                apic_version[boot_cpu_physical_apicid] =
                         GET_APIC_VERSION(apic_read(APIC_LVR));
        }
}

static int __init early_acpi_parse_madt_lapic_addr_ovr(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;
        }

        acpi_register_lapic_address(acpi_lapic_addr);

        return count;
}

static int __init acpi_parse_madt_lapic_entries(void)
{
        int count;
        int x2count = 0;

        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;
        }

        acpi_register_lapic_address(acpi_lapic_addr);

        count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
                                      acpi_parse_sapic, MAX_APICS);

        if (!count) {
                x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC,
                                                acpi_parse_x2apic, MAX_APICS);
                count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
                                              acpi_parse_lapic, MAX_APICS);
        }
        if (!count && !x2count) {
                printk(KERN_ERR PREFIX "No LAPIC entries present\n");
                /* TBD: Cleanup to allow fallback to MPS */
                return -ENODEV;
        } else if (count < 0 || x2count < 0) {
                printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
                /* TBD: Cleanup to allow fallback to MPS */
                return count;
        }

        x2count =
            acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
                                  acpi_parse_x2apic_nmi, 0);
        count =
            acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
        if (count < 0 || x2count < 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
#define MP_ISA_BUS              0

#ifdef CONFIG_X86_ES7000
extern int es7000_plat;
#endif

int __init acpi_probe_gsi(void)
{
        int idx;
        int gsi;
        int max_gsi = 0;

        if (acpi_disabled)
                return 0;

        if (!acpi_ioapic)
                return 0;

        max_gsi = 0;
        for (idx = 0; idx < nr_ioapics; idx++) {
                gsi = mp_gsi_routing[idx].gsi_end;

                if (gsi > max_gsi)
                        max_gsi = gsi;
        }

        return max_gsi + 1;
}

static void assign_to_mp_irq(struct mpc_intsrc *m,
                                    struct mpc_intsrc *mp_irq)
{
        memcpy(mp_irq, m, sizeof(struct mpc_intsrc));
}

static int mp_irq_cmp(struct mpc_intsrc *mp_irq,
                                struct mpc_intsrc *m)
{
        return memcmp(mp_irq, m, sizeof(struct mpc_intsrc));
}

static void save_mp_irq(struct mpc_intsrc *m)
{
        int i;

        for (i = 0; i < mp_irq_entries; i++) {
                if (!mp_irq_cmp(&mp_irqs[i], m))
                        return;
        }

        assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
        if (++mp_irq_entries == MAX_IRQ_SOURCES)
                panic("Max # of irq sources exceeded!!\n");
}

void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, u32 gsi)
{
        int ioapic;
        int pin;
        struct mpc_intsrc mp_irq;

        /*
         * Convert 'gsi' to 'ioapic.pin'.
         */
        ioapic = mp_find_ioapic(gsi);
        if (ioapic < 0)
                return;
        pin = mp_find_ioapic_pin(ioapic, gsi);

        /*
         * TBD: This check is for faulty timer entries, where the override
         *      erroneously sets the trigger to level, resulting in a HUGE
         *      increase of timer interrupts!
         */
        if ((bus_irq == 0) && (trigger == 3))
                trigger = 1;

        mp_irq.type = MP_INTSRC;
        mp_irq.irqtype = mp_INT;
        mp_irq.irqflag = (trigger << 2) | polarity;
        mp_irq.srcbus = MP_ISA_BUS;
        mp_irq.srcbusirq = bus_irq;     /* IRQ */
        mp_irq.dstapic = mp_ioapics[ioapic].apicid; /* APIC ID */
        mp_irq.dstirq = pin;    /* INTIN# */

        save_mp_irq(&mp_irq);
}

void __init mp_config_acpi_legacy_irqs(void)
{
        int i;
        int ioapic;
        unsigned int dstapic;
        struct mpc_intsrc mp_irq;

#if defined (CONFIG_MCA) || defined (CONFIG_EISA)
        /*
         * Fabricate the legacy ISA bus (bus #31).
         */
        mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
#endif
        set_bit(MP_ISA_BUS, mp_bus_not_pci);
        pr_debug("Bus #%d is ISA\n", MP_ISA_BUS);

#ifdef CONFIG_X86_ES7000
        /*
         * Older generations of ES7000 have no legacy identity mappings
         */
        if (es7000_plat == 1)
                return;
#endif

        /*
         * Locate the IOAPIC that manages the ISA IRQs (0-15).
         */
        ioapic = mp_find_ioapic(0);
        if (ioapic < 0)
                return;
        dstapic = mp_ioapics[ioapic].apicid;

        /*
         * Use the default configuration for the IRQs 0-15.  Unless
         * overridden by (MADT) interrupt source override entries.
         */
        for (i = 0; i < 16; i++) {
                int idx;

                for (idx = 0; idx < mp_irq_entries; idx++) {
                        struct mpc_intsrc *irq = mp_irqs + idx;

                        /* Do we already have a mapping for this ISA IRQ? */
                        if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
                                break;

                        /* Do we already have a mapping for this IOAPIC pin */
                        if (irq->dstapic == dstapic && irq->dstirq == i)
                                break;
                }

                if (idx != mp_irq_entries) {
                        printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
                        continue;       /* IRQ already used */
                }

                mp_irq.type = MP_INTSRC;
                mp_irq.irqflag = 0;     /* Conforming */
                mp_irq.srcbus = MP_ISA_BUS;
                mp_irq.dstapic = dstapic;
                mp_irq.irqtype = mp_INT;
                mp_irq.srcbusirq = i; /* Identity mapped */
                mp_irq.dstirq = i;

                save_mp_irq(&mp_irq);
        }
}

static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
                        int polarity)
{
#ifdef CONFIG_X86_MPPARSE
        struct mpc_intsrc mp_irq;
        struct pci_dev *pdev;
        unsigned char number;
        unsigned int devfn;
        int ioapic;
        u8 pin;

        if (!acpi_ioapic)
                return 0;
        if (!dev)
                return 0;

        if (dev->bus != &pci_bus_type)
                return 0;

        pdev = to_pci_dev(dev);
        number = pdev->bus->number;
        devfn = pdev->devfn;
        pin = pdev->pin;
        /* print the entry should happen on mptable identically */
        mp_irq.type = MP_INTSRC;
        mp_irq.irqtype = mp_INT;
        mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
                                (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
        mp_irq.srcbus = number;
        mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
        ioapic = mp_find_ioapic(gsi);
        mp_irq.dstapic = mp_ioapics[ioapic].apicid;
        mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);

        save_mp_irq(&mp_irq);
#endif
        return 0;
}

int mp_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
{
        int ioapic;
        int ioapic_pin;
        struct io_apic_irq_attr irq_attr;

        if (acpi_irq_model != ACPI_IRQ_MODEL_IOAPIC)
                return gsi;

        /* Don't set up the ACPI SCI because it's already set up */
        if (acpi_gbl_FADT.sci_interrupt == gsi)
                return gsi;

        ioapic = mp_find_ioapic(gsi);
        if (ioapic < 0) {
                printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
                return gsi;
        }

        ioapic_pin = mp_find_ioapic_pin(ioapic, gsi);

#ifdef CONFIG_X86_32
        if (ioapic_renumber_irq)
                gsi = ioapic_renumber_irq(ioapic, gsi);
#endif

        if (ioapic_pin > MP_MAX_IOAPIC_PIN) {
                printk(KERN_ERR "Invalid reference to IOAPIC pin "
                       "%d-%d\n", mp_ioapics[ioapic].apicid,
                       ioapic_pin);
                return gsi;
        }

        if (enable_update_mptable)
                mp_config_acpi_gsi(dev, gsi, trigger, polarity);

        set_io_apic_irq_attr(&irq_attr, ioapic, ioapic_pin,
                             trigger == ACPI_EDGE_SENSITIVE ? 0 : 1,
                             polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
        io_apic_set_pci_routing(dev, gsi, &irq_attr);

        return gsi;
}

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

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_BIGSMP
                        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_ioapic = 1;

                                smp_found_config = 1;
                                if (apic->setup_apic_routing)
                                        apic->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();
                }
        } else {
                /*
                 * ACPI found no MADT, and so ACPI wants UP PIC mode.
                 * In the event an MPS table was found, forget it.
                 * Boot with "acpi=off" to use MPS on such a system.
                 */
                if (smp_found_config) {
                        printk(KERN_WARNING PREFIX
                                "No APIC-table, disabling MPS\n");
                        smp_found_config = 0;
                }
        }

        /*
         * ACPI supports both logical (e.g. Hyper-Threading) and physical
         * processors, where MPS only supports physical.
         */
        if (acpi_lapic && acpi_ioapic)
                printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
                       "information\n");
        else if (acpi_lapic)
                printk(KERN_INFO "Using ACPI for processor (LAPIC) "
                       "configuration information\n");
#endif
        return;
}

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;
}

/*
 * Force ignoring BIOS IRQ0 pin2 override
 */
static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
{
        /*
         * The ati_ixp4x0_rev() early PCI quirk should have set
         * the acpi_skip_timer_override flag already:
         */
        if (!acpi_skip_timer_override) {
                WARN(1, KERN_ERR "ati_ixp4x0 quirk not complete.\n");
                pr_notice("%s detected: Ignoring BIOS IRQ0 pin2 override\n",
                        d->ident);
                acpi_skip_timer_override = 1;
        }
        return 0;
}

/*
 * If your system is blacklisted here, but you find that acpi=force
 * works for you, please contact linux-acpi@vger.kernel.org
 */
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 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"),
                     },
         },
        {}
};

/* second table for DMI checks that should run after early-quirks */
static struct dmi_system_id __initdata acpi_dmi_table_late[] = {
        /*
         * HP laptops which use a DSDT reporting as HP/SB400/10000,
         * which includes some code which overrides all temperature
         * trip points to 16C if the INTIN2 input of the I/O APIC
         * is enabled.  This input is incorrectly designated the
         * ISA IRQ 0 via an interrupt source override even though
         * it is wired to the output of the master 8259A and INTIN0
         * is not connected at all.  Force ignoring BIOS IRQ0 pin2
         * override in that cases.
         */
        {
         .callback = dmi_ignore_irq0_timer_override,
         .ident = "HP nx6115 laptop",
         .matches = {
                     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
                     },
         },
        {
         .callback = dmi_ignore_irq0_timer_override,
         .ident = "HP NX6125 laptop",
         .matches = {
                     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
                     },
         },
        {
         .callback = dmi_ignore_irq0_timer_override,
         .ident = "HP NX6325 laptop",
         .matches = {
                     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
                     },
         },
        {
         .callback = dmi_ignore_irq0_timer_override,
         .ident = "HP 6715b laptop",
         .matches = {
                     DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                     DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
                     },
         },
        {}
};

/*
 * 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;

        dmi_check_system(acpi_dmi_table);

        /*
         * 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 early_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;

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

        return 0;
}

int __init acpi_boot_init(void)
{
        /* those are executed after early-quirks are executed */
        dmi_check_system(acpi_dmi_table_late);

        /*
         * 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=rsdt use RSDT instead of XSDT */
        else if (strcmp(arg, "rsdt") == 0) {
                acpi_rsdt_forced = 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);

int __init acpi_mps_check(void)
{
#if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
/* mptable code is not built-in*/
        if (acpi_disabled || acpi_noirq) {
                printk(KERN_WARNING "MPS support code is not built-in.\n"
                       "Using acpi=off or acpi=noirq or pci=noacpi "
                       "may have problem\n");
                return 1;
        }
#endif
        return 0;
}

#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;
}