boot.c

Go to the documentation of this file.

/*
 *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
 *
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
 *  Copyright (C) 2001 Jun Nakajima <[email protected]>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/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/slab.h>
#include <linux/bootmem.h>
#include <linux/ioport.h>
#include <linux/pci.h>

#include <asm/pci_x86.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>
# include <asm/numa_64.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_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;
int acpi_fix_pin2_polarity __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;


/*
 * ISA irqs by default are the first 16 gsis but can be
 * any gsi as specified by an interrupt source override.
 */
static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
};

static unsigned int gsi_to_irq(unsigned int gsi)
{
    unsigned int irq = gsi + NR_IRQS_LEGACY;
    unsigned int i;

    for (i = 0; i < NR_IRQS_LEGACY; i++) {
        if (isa_irq_to_gsi[i] == gsi) {
            return i;
        }
    }

    /* Provide an identity mapping of gsi == irq
     * except on truly weird platforms that have
     * non isa irqs in the first 16 gsis.
     */
    if (gsi >= NR_IRQS_LEGACY)
        irq = gsi;
    else
        irq = gsi_top + gsi;

    return irq;
}

static u32 irq_to_gsi(int irq)
{
    unsigned int gsi;

    if (irq < NR_IRQS_LEGACY)
        gsi = isa_irq_to_gsi[irq];
    else if (irq < gsi_top)
        gsi = irq;
    else if (irq < (gsi_top + NR_IRQS_LEGACY))
        gsi = irq - gsi_top;
    else
        gsi = 0xffffffff;

    return gsi;
}

/*
 * 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 (id >= (MAX_LOCAL_APIC-1)) {
        printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
        return;
    }

    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;
    int apic_id;
    u8 enabled;

    processor = (struct acpi_madt_local_x2apic *)header;

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

    acpi_table_print_madt_entry(header);

    apic_id = processor->local_apic_id;
    enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
#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.
     */
    if (!apic->apic_id_valid(apic_id) && enabled)
        printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
    else
        acpi_register_lapic(apic_id, 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(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
{
    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(bus_irq, 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->source_irq,
                      intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
                      (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
                      intsrc->global_irq);
        return 0;
    }

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

        if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
            && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
            intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
            printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
        }
    }

    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_to_irq(gsi);

#ifdef CONFIG_X86_IO_APIC
    if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
        setup_IO_APIC_irq_extra(gsi);
#endif

    return 0;
}
EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);

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

static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
                 int trigger, int polarity)
{
#ifdef CONFIG_PCI
    /*
     * Make sure all (legacy) PCI IRQs are set as level-triggered.
     */
    if (trigger == ACPI_LEVEL_SENSITIVE)
        eisa_set_level_irq(gsi);
#endif

    return gsi;
}

static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
                    int trigger, int polarity)
{
#ifdef CONFIG_X86_IO_APIC
    gsi = mp_register_gsi(dev, gsi, trigger, polarity);
#endif

    return gsi;
}

int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
               int trigger, int polarity) = acpi_register_gsi_pic;

/*
 * 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;

    plat_gsi = (*__acpi_register_gsi)(dev, gsi, trigger, polarity);
    irq = gsi_to_irq(plat_gsi);

    return irq;
}

void __init acpi_set_irq_model_pic(void)
{
    acpi_irq_model = ACPI_IRQ_MODEL_PIC;
    __acpi_register_gsi = acpi_register_gsi_pic;
    acpi_ioapic = 0;
}

void __init acpi_set_irq_model_ioapic(void)
{
    acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
    __acpi_register_gsi = acpi_register_gsi_ioapic;
    acpi_ioapic = 1;
}

/*
 *  ACPI based hotplug support for CPU
 */
#ifdef CONFIG_ACPI_HOTPLUG_CPU
#include <acpi/processor.h>

static void __cpuinit acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
{
#ifdef CONFIG_ACPI_NUMA
    int nid;

    nid = acpi_get_node(handle);
    if (nid == -1 || !node_online(nid))
        return;
    set_apicid_to_node(physid, nid);
    numa_set_node(cpu, nid);
#endif
}

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;
    lapic = 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, ACPI_MADT_ENABLED);

    /*
     * If acpi_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;
    }

    acpi_processor_set_pdc(handle);

    cpu = cpumask_first(new_map);
    acpi_map_cpu2node(handle, cpu, physid);

    *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;
    hpet_blockid = hpet_tbl->sequence;

    /*
     * 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 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;
    }

    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;
    }

    register_lapic_address(acpi_lapic_addr);

    count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
                      acpi_parse_sapic, MAX_LOCAL_APIC);

    if (!count) {
        x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC,
                    acpi_parse_x2apic, MAX_LOCAL_APIC);
        count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
                    acpi_parse_lapic, MAX_LOCAL_APIC);
    }
    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

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 = mpc_ioapic_id(ioapic); /* APIC ID */
    mp_irq.dstirq = pin;    /* INTIN# */

    mp_save_irq(&mp_irq);

    isa_irq_to_gsi[bus_irq] = gsi;
}

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

#ifdef 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

    /*
     * Use the default configuration for the IRQs 0-15.  Unless
     * overridden by (MADT) interrupt source override entries.
     */
    for (i = 0; i < 16; i++) {
        int ioapic, pin;
        unsigned int dstapic;
        int idx;
        u32 gsi;

        /* Locate the gsi that irq i maps to. */
        if (acpi_isa_irq_to_gsi(i, &gsi))
            continue;

        /*
         * Locate the IOAPIC that manages the ISA IRQ.
         */
        ioapic = mp_find_ioapic(gsi);
        if (ioapic < 0)
            continue;
        pin = mp_find_ioapic_pin(ioapic, gsi);
        dstapic = mpc_ioapic_id(ioapic);

        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 == pin)
                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 = pin;

        mp_save_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 = mpc_ioapic_id(ioapic);
    mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);

    mp_save_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);

    if (ioapic_pin > MP_MAX_IOAPIC_PIN) {
        printk(KERN_ERR "Invalid reference to IOAPIC pin "
               "%d-%d\n", mpc_ioapic_id(ioapic),
               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_to_irq(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,
                      acpi_gbl_FADT.sci_interrupt);

    /* Fill in identity legacy mappings 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;

            /*
             * Parse MADT IO-APIC entries
             */
            error = acpi_parse_madt_ioapic_entries();
            if (!error) {
                acpi_set_irq_model_ioapic();

                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();
        }
    } 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;
}

/*
 * Force ignoring BIOS IRQ0 override
 */
static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
{
    if (!acpi_skip_timer_override) {
        pr_notice("%s detected: Ignoring BIOS IRQ0 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 [email protected]
 */
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 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
     * 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"),
             },
     },
    {
     .callback = dmi_ignore_irq0_timer_override,
     .ident = "FUJITSU SIEMENS",
     .matches = {
             DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
             DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
             },
     },
    {}
};

/*
 * 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=...
 *  ...
 */

void __init acpi_boot_table_init(void)
{
    dmi_check_system(acpi_dmi_table);

    /*
     * If acpi_disabled, bail out
     */
    if (acpi_disabled)
        return; 

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

    acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);

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

int __init early_acpi_boot_init(void)
{
    /*
     * If acpi_disabled, bail out
     */
    if (acpi_disabled)
        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
     */
    if (acpi_disabled)
        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);

    if (!acpi_noirq)
        x86_init.pci.init = pci_acpi_init;

    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_disabled = 0;
    }
    /* acpi=strict disables out-of-spec workarounds */
    else if (strcmp(arg, "strict") == 0) {
        acpi_strict = 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();
    }
    /* "acpi=copy_dsdt" copys DSDT */
    else if (strcmp(arg, "copy_dsdt") == 0) {
        acpi_gbl_copy_dsdt_locally = 1;
    } 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;
}