ACPICA: minimal patch to integrate new tables into Linux

[mirror_ubuntu-zesty-kernel.git] / arch / i386 / kernel / acpi / boot.c

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

#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/cpumask.h>
#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/irq.h>
#include <linux/bootmem.h>
#include <linux/ioport.h>

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

static int __initdata acpi_force = 0;

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

#ifdef  CONFIG_X86_64

#include <asm/proto.h>

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


#else                           /* X86 */

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

#endif                          /* X86 */

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

#define PREFIX                  "ACPI: "

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

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

acpi_interrupt_flags 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

#define MAX_MADT_ENTRIES        256
u8 x86_acpiid_to_apicid[MAX_MADT_ENTRIES] =
    {[0 ... MAX_MADT_ENTRIES - 1] = 0xff };
EXPORT_SYMBOL(x86_acpiid_to_apicid);

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

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

#ifdef  CONFIG_X86_64

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

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

        return NULL;
}

#else

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

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

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

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

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

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

int __init acpi_parse_mcfg(unsigned long phys_addr, unsigned long size)
{
        struct acpi_table_mcfg *mcfg;
        unsigned long i;
        int config_size;

        if (!phys_addr || !size)
                return -EINVAL;

        mcfg = (struct acpi_table_mcfg *)__acpi_map_table(phys_addr, size);
        if (!mcfg) {
                printk(KERN_WARNING PREFIX "Unable to map MCFG\n");
                return -ENODEV;
        }

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

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

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

        return 0;
}
#endif                          /* CONFIG_PCI_MMCONFIG */

#ifdef CONFIG_X86_LOCAL_APIC
static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
{
        struct acpi_table_madt *madt = NULL;

        if (!phys_addr || !size || !cpu_has_apic)
                return -EINVAL;

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

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

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

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

        return 0;
}

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

        processor = (struct acpi_table_lapic *)header;

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

        acpi_table_print_madt_entry(header);

        /* Record local apic id only when enabled */
        if (processor->flags.enabled)
                x86_acpiid_to_apicid[processor->acpi_id] = processor->id;

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

        return 0;
}

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

        lapic_addr_ovr = (struct acpi_table_lapic_addr_ovr *)header;

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

        acpi_lapic_addr = lapic_addr_ovr->address;

        return 0;
}

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

        lapic_nmi = (struct acpi_table_lapic_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(acpi_table_entry_header * header, const unsigned long end)
{
        struct acpi_table_ioapic *ioapic = NULL;

        ioapic = (struct acpi_table_ioapic *)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.trigger)
                trigger = acpi_sci_flags.trigger;

        if (acpi_sci_flags.polarity)
                polarity = acpi_sci_flags.polarity;

        /*
         * 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_fadt
         */
        acpi_sci_override_gsi = gsi;
        return;
}

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

        intsrc = (struct acpi_table_int_src_ovr *)header;

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

        acpi_table_print_madt_entry(header);

        if (intsrc->bus_irq == acpi_fadt.sci_int) {
                acpi_sci_ioapic_setup(intsrc->global_irq,
                                      intsrc->flags.polarity,
                                      intsrc->flags.trigger);
                return 0;
        }

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

        mp_override_legacy_irq(intsrc->bus_irq,
                               intsrc->flags.polarity,
                               intsrc->flags.trigger, intsrc->global_irq);

        return 0;
}

static int __init
acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
{
        struct acpi_table_nmi_src *nmi_src = NULL;

        nmi_src = (struct acpi_table_nmi_src *)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 IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
 * ECLR2 is IRQ's 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 irq's, then we should clear ELCR
         * since we will set it correctly as we enable the PCI irq
         * routing.
         */
        new = acpi_noirq ? old : 0;

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

        if (old == new)
                return;

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

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

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

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

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

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

EXPORT_SYMBOL(acpi_register_gsi);

/*
 *  ACPI based hotplug support for CPU
 */
#ifdef CONFIG_ACPI_HOTPLUG_CPU
int acpi_map_lsapic(acpi_handle handle, int *pcpu)
{
        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
        union acpi_object *obj;
        struct acpi_table_lapic *lapic;
        cpumask_t tmp_map, new_map;
        u8 physid;
        int cpu;

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

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

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

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

        if ((lapic->header.type != ACPI_MADT_LAPIC) ||
            (!lapic->flags.enabled)) {
                kfree(buffer.pointer);
                return -EINVAL;
        }

        physid = lapic->id;

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

        tmp_map = cpu_present_map;
        mp_register_lapic(physid, lapic->flags.enabled);

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

        cpu = first_cpu(new_map);

        *pcpu = cpu;
        return 0;
}

EXPORT_SYMBOL(acpi_map_lsapic);

int acpi_unmap_lsapic(int cpu)
{
        int i;

        for_each_possible_cpu(i) {
                if (x86_acpiid_to_apicid[i] == x86_cpu_to_apicid[cpu]) {
                        x86_acpiid_to_apicid[i] = -1;
                        break;
                }
        }
        x86_cpu_to_apicid[cpu] = -1;
        cpu_clear(cpu, cpu_present_map);
        num_processors--;

        return (0);
}

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

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

EXPORT_SYMBOL(acpi_register_ioapic);

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

EXPORT_SYMBOL(acpi_unregister_ioapic);

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

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

        return 0;
}

static int __init acpi_parse_sbf(unsigned long phys_addr, unsigned long size)
{
        struct acpi_table_sbf *sb;

        if (!phys_addr || !size)
                return -EINVAL;

        sb = (struct acpi_table_sbf *)__acpi_map_table(phys_addr, size);
        if (!sb) {
                printk(KERN_WARNING PREFIX "Unable to map SBF\n");
                return -ENODEV;
        }

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

        return 0;
}

#ifdef CONFIG_HPET_TIMER

static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
{
        struct acpi_table_hpet *hpet_tbl;
        struct resource *hpet_res;
        resource_size_t res_start;

        if (!phys || !size)
                return -EINVAL;

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

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

#define HPET_RESOURCE_NAME_SIZE 9
        hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
        if (hpet_res) {
                memset(hpet_res, 0, sizeof(*hpet_res));
                hpet_res->name = (void *)&hpet_res[1];
                hpet_res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
                snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE,
                         "HPET %u", hpet_tbl->number);
                hpet_res->end = (1 * 1024) - 1;
        }

#ifdef  CONFIG_X86_64
        vxtime.hpet_address = hpet_tbl->addr.addrl |
            ((long)hpet_tbl->addr.addrh << 32);

        printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
               hpet_tbl->id, vxtime.hpet_address);

        res_start = vxtime.hpet_address;
#else                           /* X86 */
        {
                extern unsigned long hpet_address;

                hpet_address = hpet_tbl->addr.addrl;
                printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
                       hpet_tbl->id, hpet_address);

                res_start = hpet_address;
        }
#endif                          /* X86 */

        if (hpet_res) {
                hpet_res->start = res_start;
                hpet_res->end += res_start;
                insert_resource(&iomem_resource, hpet_res);
        }

        return 0;
}
#else
#define acpi_parse_hpet NULL
#endif

#ifdef CONFIG_X86_PM_TIMER
extern u32 pmtmr_ioport;
#endif

static int __init acpi_parse_fadt(unsigned long phys, unsigned long size)
{
        struct fadt_descriptor *fadt = NULL;

        fadt = (struct fadt_descriptor *)__acpi_map_table(phys, size);
        if (!fadt) {
                printk(KERN_WARNING PREFIX "Unable to map FADT\n");
                return 0;
        }

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

                pmtmr_ioport = 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 = fadt->pm_timer_block;
        } else {
                /* FADT rev. 1 */
                pmtmr_ioport = fadt->pm_timer_block;
        }
        if (pmtmr_ioport)
                printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
                       pmtmr_ioport);
#endif
        return 0;
}

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

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

        return rsdp_phys;
}

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

        if (!cpu_has_apic)
                return -ENODEV;

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

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

        mp_register_lapic_address(acpi_lapic_addr);

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

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

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

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

        if (!cpu_has_apic) 
                return -ENODEV;

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

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

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

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

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

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

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

        count = acpi_table_parse(ACPI_APIC, acpi_parse_madt);
        if (count >= 1) {

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

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

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

#ifdef __i386__

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

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

        /*
         * Boxes that need acpi=ht
         */
        {
         .callback = force_acpi_ht,
         .ident = "FSC Primergy T850",
         .matches = {
                     DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
                     DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
                     },
         },
        {
         .callback = force_acpi_ht,
         .ident = "DELL GX240",
         .matches = {
                     DMI_MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
                     DMI_MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
                     },
         },
        {
         .callback = force_acpi_ht,
         .ident = "HP VISUALIZE NT Workstation",
         .matches = {
                     DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
                     DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
                     },
         },
        {
         .callback = force_acpi_ht,
         .ident = "Compaq Workstation W8000",
         .matches = {
                     DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
                     DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
                     },
         },
        {
         .callback = force_acpi_ht,
         .ident = "ASUS P4B266",
         .matches = {
                     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
                     DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
                     },
         },
        {
         .callback = force_acpi_ht,
         .ident = "ASUS P2B-DS",
         .matches = {
                     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
                     DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
                     },
         },
        {
         .callback = force_acpi_ht,
         .ident = "ASUS CUR-DLS",
         .matches = {
                     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
                     DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
                     },
         },
        {
         .callback = force_acpi_ht,
         .ident = "ABIT i440BX-W83977",
         .matches = {
                     DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
                     DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
                     },
         },
        {
         .callback = force_acpi_ht,
         .ident = "IBM Bladecenter",
         .matches = {
                     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
                     DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
                     },
         },
        {
         .callback = force_acpi_ht,
         .ident = "IBM eServer xSeries 360",
         .matches = {
                     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
                     DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
                     },
         },
        {
         .callback = force_acpi_ht,
         .ident = "IBM eserver xSeries 330",
         .matches = {
                     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
                     DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
                     },
         },
        {
         .callback = force_acpi_ht,
         .ident = "IBM eserver xSeries 440",
         .matches = {
                     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
                     DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
                     },
         },

        /*
         * Boxes that need ACPI PCI IRQ routing disabled
         */
        {
         .callback = disable_acpi_irq,
         .ident = "ASUS A7V",
         .matches = {
                     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
                     DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
                     /* newer BIOS, Revision 1011, does work */
                     DMI_MATCH(DMI_BIOS_VERSION,
                               "ASUS A7V ACPI BIOS Revision 1007"),
                     },
         },

        /*
         * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
         */
        {                       /* _BBN 0 bug */
         .callback = disable_acpi_pci,
         .ident = "ASUS PR-DLS",
         .matches = {
                     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
                     DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
                     DMI_MATCH(DMI_BIOS_VERSION,
                               "ASUS PR-DLS ACPI BIOS Revision 1010"),
                     DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
                     },
         },
        {
         .callback = disable_acpi_pci,
         .ident = "Acer TravelMate 36x Laptop",
         .matches = {
                     DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                     DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
                     },
         },
        {}
};

#endif                          /* __i386__ */

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

int __init acpi_boot_table_init(void)
{
        int error;

#ifdef __i386__
        dmi_check_system(acpi_dmi_table);
#endif

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

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

        acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);

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

        return 0;
}

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

        acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);

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

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

        acpi_table_parse(ACPI_HPET, acpi_parse_hpet);

        return 0;
}

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

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

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

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

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

static int __init setup_acpi_sci(char *s)
{
        if (!s)
                return -EINVAL;
        if (!strcmp(s, "edge"))
                acpi_sci_flags.trigger = 1;
        else if (!strcmp(s, "level"))
                acpi_sci_flags.trigger = 3;
        else if (!strcmp(s, "high"))
                acpi_sci_flags.polarity = 1;
        else if (!strcmp(s, "low"))
                acpi_sci_flags.polarity = 3;
        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;
}