path: root/arch/x86/kernel/acpi/boot.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  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>
 */
#define pr_fmt(fmt) "ACPI: " fmt

#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/acpi_pmtmr.h>
#include <linux/efi.h>
#include <linux/cpumask.h>
#include <linux/export.h>
#include <linux/dmi.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/memblock.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/efi-bgrt.h>
#include <linux/serial_core.h>
#include <linux/pgtable.h>

#include <asm/e820/api.h>
#include <asm/irqdomain.h>
#include <asm/pci_x86.h>
#include <asm/io_apic.h>
#include <asm/apic.h>
#include <asm/io.h>
#include <asm/mpspec.h>
#include <asm/smp.h>
#include <asm/i8259.h>
#include <asm/setup.h>

#include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
static int __initdata acpi_force = 0;
int acpi_disabled;
EXPORT_SYMBOL(acpi_disabled);

#ifdef	CONFIG_X86_64
# include <asm/proto.h>
#endif				/* X86 */

int acpi_noirq;				/* skip ACPI IRQ initialization */
static int acpi_nobgrt;			/* skip ACPI BGRT */
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;
int acpi_disable_cmcff;
bool acpi_int_src_ovr[NR_IRQS_LEGACY];

/* ACPI SCI override configuration */
u8 acpi_sci_flags __initdata;
u32 acpi_sci_override_gsi __initdata = INVALID_ACPI_IRQ;
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;
static bool has_lapic_cpus __initdata;
static bool acpi_support_online_capable;
#endif

#ifdef CONFIG_X86_64
/* Physical address of the Multiprocessor Wakeup Structure mailbox */
static u64 acpi_mp_wake_mailbox_paddr;
/* Virtual address of the Multiprocessor Wakeup Structure mailbox */
static struct acpi_madt_multiproc_wakeup_mailbox *acpi_mp_wake_mailbox;
#endif

#ifdef CONFIG_X86_IO_APIC
/*
 * Locks related to IOAPIC hotplug
 * Hotplug side:
 *	->device_hotplug_lock
 *		->acpi_ioapic_lock
 *			->ioapic_lock
 * Interrupt mapping side:
 *	->acpi_ioapic_lock
 *		->ioapic_mutex
 *			->ioapic_lock
 */
static DEFINE_MUTEX(acpi_ioapic_lock);
#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
};

/*
 * This is just a simple wrapper around early_memremap(),
 * with sanity checks for phys == 0 and size == 0.
 */
void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
{

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

	return early_memremap(phys, size);
}

void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
{
	if (!map || !size)
		return;

	early_memunmap(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 (!boot_cpu_has(X86_FEATURE_APIC))
		return -EINVAL;

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

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

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

	if (madt->flags & ACPI_MADT_PCAT_COMPAT)
		legacy_pic_pcat_compat();

	/* ACPI 6.3 and newer support the online capable bit. */
	if (acpi_gbl_FADT.header.revision > 6 ||
	    (acpi_gbl_FADT.header.revision == 6 &&
	     acpi_gbl_FADT.minor_revision >= 3))
		acpi_support_online_capable = true;

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

	return 0;
}

/**
 * acpi_register_lapic - register a local apic and generates a logic cpu number
 * @id: local apic id to register
 * @acpiid: ACPI id to register
 * @enabled: this cpu is enabled or not
 *
 * Returns the logic cpu number which maps to the local apic
 */
static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
{
	int cpu;

	if (id >= MAX_LOCAL_APIC) {
		pr_info("skipped apicid that is too big\n");
		return -EINVAL;
	}

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

	cpu = generic_processor_info(id);
	if (cpu >= 0)
		early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;

	return cpu;
}

static bool __init acpi_is_processor_usable(u32 lapic_flags)
{
	if (lapic_flags & ACPI_MADT_ENABLED)
		return true;

	if (!acpi_support_online_capable ||
	    (lapic_flags & ACPI_MADT_ONLINE_CAPABLE))
		return true;

	return false;
}

static int __init
acpi_parse_x2apic(union acpi_subtable_headers *header, const unsigned long end)
{
	struct acpi_madt_local_x2apic *processor = NULL;
#ifdef CONFIG_X86_X2APIC
	u32 apic_id;
	u8 enabled;
#endif

	processor = (struct acpi_madt_local_x2apic *)header;

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

	acpi_table_print_madt_entry(&header->common);

#ifdef CONFIG_X86_X2APIC
	apic_id = processor->local_apic_id;
	enabled = processor->lapic_flags & ACPI_MADT_ENABLED;

	/* Ignore invalid ID */
	if (apic_id == 0xffffffff)
		return 0;

	/* don't register processors that cannot be onlined */
	if (!acpi_is_processor_usable(processor->lapic_flags))
		return 0;

	/*
	 * According to https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#processor-local-x2apic-structure
	 * when MADT provides both valid LAPIC and x2APIC entries, the APIC ID
	 * in x2APIC must be equal or greater than 0xff.
	 */
	if (has_lapic_cpus && apic_id < 0xff)
		return 0;

	/*
	 * 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_id_valid(apic_id)) {
		if (enabled)
			pr_warn("x2apic entry ignored\n");
		return 0;
	}

	acpi_register_lapic(apic_id, processor->uid, enabled);
#else
	pr_warn("x2apic entry ignored\n");
#endif

	return 0;
}

static int __init
acpi_parse_lapic(union acpi_subtable_headers * 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->common);

	/* Ignore invalid ID */
	if (processor->id == 0xff)
		return 0;

	/* don't register processors that can not be onlined */
	if (!acpi_is_processor_usable(processor->lapic_flags))
		return 0;

	/*
	 * 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->processor_id, /* ACPI ID */
			    processor->lapic_flags & ACPI_MADT_ENABLED);

	has_lapic_cpus = true;
	return 0;
}

static int __init
acpi_parse_sapic(union acpi_subtable_headers *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->common);

	acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
			    processor->processor_id, /* ACPI ID */
			    processor->lapic_flags & ACPI_MADT_ENABLED);

	return 0;
}

static int __init
acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * 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_table_print_madt_entry(&header->common);

	acpi_lapic_addr = lapic_addr_ovr->address;

	return 0;
}

static int __init
acpi_parse_x2apic_nmi(union acpi_subtable_headers *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->common);

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

	return 0;
}

static int __init
acpi_parse_lapic_nmi(union acpi_subtable_headers * 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->common);

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

	return 0;
}

#ifdef CONFIG_X86_64
static int acpi_wakeup_cpu(u32 apicid, unsigned long start_ip)
{
	/*
	 * Remap mailbox memory only for the first call to acpi_wakeup_cpu().
	 *
	 * Wakeup of secondary CPUs is fully serialized in the core code.
	 * No need to protect acpi_mp_wake_mailbox from concurrent accesses.
	 */
	if (!acpi_mp_wake_mailbox) {
		acpi_mp_wake_mailbox = memremap(acpi_mp_wake_mailbox_paddr,
						sizeof(*acpi_mp_wake_mailbox),
						MEMREMAP_WB);
	}

	/*
	 * Mailbox memory is shared between the firmware and OS. Firmware will
	 * listen on mailbox command address, and once it receives the wakeup
	 * command, the CPU associated with the given apicid will be booted.
	 *
	 * The value of 'apic_id' and 'wakeup_vector' must be visible to the
	 * firmware before the wakeup command is visible.  smp_store_release()
	 * ensures ordering and visibility.
	 */
	acpi_mp_wake_mailbox->apic_id	    = apicid;
	acpi_mp_wake_mailbox->wakeup_vector = start_ip;
	smp_store_release(&acpi_mp_wake_mailbox->command,
			  ACPI_MP_WAKE_COMMAND_WAKEUP);

	/*
	 * Wait for the CPU to wake up.
	 *
	 * The CPU being woken up is essentially in a spin loop waiting to be
	 * woken up. It should not take long for it wake up and acknowledge by
	 * zeroing out ->command.
	 *
	 * ACPI specification doesn't provide any guidance on how long kernel
	 * has to wait for a wake up acknowledgement. It also doesn't provide
	 * a way to cancel a wake up request if it takes too long.
	 *
	 * In TDX environment, the VMM has control over how long it takes to
	 * wake up secondary. It can postpone scheduling secondary vCPU
	 * indefinitely. Giving up on wake up request and reporting error opens
	 * possible attack vector for VMM: it can wake up a secondary CPU when
	 * kernel doesn't expect it. Wait until positive result of the wake up
	 * request.
	 */
	while (READ_ONCE(acpi_mp_wake_mailbox->command))
		cpu_relax();

	return 0;
}
#endif /* CONFIG_X86_64 */
#endif /* CONFIG_X86_LOCAL_APIC */

#ifdef CONFIG_X86_IO_APIC
#define MP_ISA_BUS		0

static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
						u8 trigger, u32 gsi);

static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
					  u32 gsi)
{
	/*
	 * Check bus_irq boundary.
	 */
	if (bus_irq >= NR_IRQS_LEGACY) {
		pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
		return;
	}

	/*
	 * 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;

	if (mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi) < 0)
		return;
	/*
	 * Reset default identity mapping if gsi is also an legacy IRQ,
	 * otherwise there will be more than one entry with the same GSI
	 * and acpi_isa_irq_to_gsi() may give wrong result.
	 */
	if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
		isa_irq_to_gsi[gsi] = INVALID_ACPI_IRQ;
	isa_irq_to_gsi[bus_irq] = gsi;
}

static void 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;
	if (!dev || !dev_is_pci(dev))
		return;

	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
}

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

	/* Convert 'gsi' to 'ioapic.pin'(INTIN#) */
	ioapic = mp_find_ioapic(gsi);
	if (ioapic < 0) {
		pr_warn("Failed to find ioapic for gsi : %u\n", gsi);
		return ioapic;
	}

	pin = mp_find_ioapic_pin(ioapic, gsi);

	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;
	mp_irq.dstapic = mpc_ioapic_id(ioapic);
	mp_irq.dstirq = pin;

	mp_save_irq(&mp_irq);

	return 0;
}

static int __init
acpi_parse_ioapic(union acpi_subtable_headers * header, const unsigned long end)
{
	struct acpi_madt_io_apic *ioapic = NULL;
	struct ioapic_domain_cfg cfg = {
		.type = IOAPIC_DOMAIN_DYNAMIC,
		.ops = &mp_ioapic_irqdomain_ops,
	};

	ioapic = (struct acpi_madt_io_apic *)header;

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

	acpi_table_print_madt_entry(&header->common);

	/* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
	if (ioapic->global_irq_base < nr_legacy_irqs())
		cfg.type = IOAPIC_DOMAIN_LEGACY;

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

	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;

	if (bus_irq < NR_IRQS_LEGACY)
		mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
	else
		mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi);

	acpi_penalize_sci_irq(bus_irq, trigger, polarity);

	/*
	 * 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(union acpi_subtable_headers * 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->common);

	if (intsrc->source_irq < NR_IRQS_LEGACY)
		acpi_int_src_ovr[intsrc->source_irq] = true;

	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) {
			pr_warn("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;
			pr_warn("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(union acpi_subtable_headers * 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->common);

	/* 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 ELCR1 and ELCR2, the Edge/Level Control Registers
 * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 * ELCR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
 * ELCR2 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(PIC_ELCR1) | (inb(PIC_ELCR2) << 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;

	pr_warn("setting ELCR to %04x (from %04x)\n", new, old);
	outb(new, PIC_ELCR1);
	outb(new >> 8, PIC_ELCR2);
}

int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
{
	int rc, irq, trigger, polarity;

	if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
		*irqp = gsi;
		return 0;
	}

	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
	if (rc)
		return rc;

	trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
	polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
	irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
	if (irq < 0)
		return irq;

	*irqp = irq;
	return 0;
}
EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);

int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
{
	if (isa_irq < nr_legacy_irqs() &&
	    isa_irq_to_gsi[isa_irq] != INVALID_ACPI_IRQ) {
		*gsi = isa_irq_to_gsi[isa_irq];
		return 0;
	}

	return -1;
}

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)
		elcr_set_level_irq(gsi);
#endif

	return gsi;
}

#ifdef CONFIG_X86_LOCAL_APIC
static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
				    int trigger, int polarity)
{
	int irq = gsi;
#ifdef CONFIG_X86_IO_APIC
	int node;
	struct irq_alloc_info info;

	node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
	trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
	polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
	ioapic_set_alloc_attr(&info, node, trigger, polarity);

	mutex_lock(&acpi_ioapic_lock);
	irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
	/* Don't set up the ACPI SCI because it's already set up */
	if (irq >= 0 && enable_update_mptable && gsi != acpi_gbl_FADT.sci_interrupt)
		mp_config_acpi_gsi(dev, gsi, trigger, polarity);
	mutex_unlock(&acpi_ioapic_lock);
#endif

	return irq;
}

static void acpi_unregister_gsi_ioapic(u32 gsi)
{
#ifdef CONFIG_X86_IO_APIC
	int irq;

	mutex_lock(&acpi_ioapic_lock);
	irq = mp_map_gsi_to_irq(gsi, 0, NULL);
	if (irq > 0)
		mp_unmap_irq(irq);
	mutex_unlock(&acpi_ioapic_lock);
#endif
}
#endif

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

#ifdef CONFIG_ACPI_SLEEP
int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
#else
int (*acpi_suspend_lowlevel)(void);
#endif

/*
 * success: return IRQ number (>=0)
 * failure: return < 0
 */
int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
{
	return __acpi_register_gsi(dev, gsi, trigger, polarity);
}
EXPORT_SYMBOL_GPL(acpi_register_gsi);

void acpi_unregister_gsi(u32 gsi)
{
	if (__acpi_unregister_gsi)
		__acpi_unregister_gsi(gsi);
}
EXPORT_SYMBOL_GPL(acpi_unregister_gsi);

#ifdef CONFIG_X86_LOCAL_APIC
static void __init acpi_set_irq_model_ioapic(void)
{
	acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
	__acpi_register_gsi = acpi_register_gsi_ioapic;
	__acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
	acpi_ioapic = 1;
}
#endif

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

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

	nid = acpi_get_node(handle);
	if (nid != NUMA_NO_NODE) {
		set_apicid_to_node(physid, nid);
		numa_set_node(cpu, nid);
	}
#endif
	return 0;
}

int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
		 int *pcpu)
{
	int cpu;

	cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED);
	if (cpu < 0) {
		pr_info("Unable to map lapic to logical cpu number\n");
		return cpu;
	}

	acpi_processor_set_pdc(handle);
	acpi_map_cpu2node(handle, cpu, physid);

	*pcpu = cpu;
	return 0;
}
EXPORT_SYMBOL(acpi_map_cpu);

int acpi_unmap_cpu(int cpu)
{
#ifdef CONFIG_ACPI_NUMA
	set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
#endif

	per_cpu(x86_cpu_to_apicid, cpu) = BAD_APICID;
	set_cpu_present(cpu, false);
	num_processors--;

	return (0);
}
EXPORT_SYMBOL(acpi_unmap_cpu);
#endif				/* CONFIG_ACPI_HOTPLUG_CPU */

int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
{
	int ret = -ENOSYS;
#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
	int ioapic_id;
	u64 addr;
	struct ioapic_domain_cfg cfg = {
		.type = IOAPIC_DOMAIN_DYNAMIC,
		.ops = &mp_ioapic_irqdomain_ops,
	};

	ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
	if (ioapic_id < 0) {
		unsigned long long uid;
		acpi_status status;

		status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
					       NULL, &uid);
		if (ACPI_FAILURE(status)) {
			acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
			return -EINVAL;
		}
		ioapic_id = (int)uid;
	}

	mutex_lock(&acpi_ioapic_lock);
	ret  = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
	mutex_unlock(&acpi_ioapic_lock);
#endif

	return ret;
}
EXPORT_SYMBOL(acpi_register_ioapic);

int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
{
	int ret = -ENOSYS;

#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
	mutex_lock(&acpi_ioapic_lock);
	ret  = mp_unregister_ioapic(gsi_base);
	mutex_unlock(&acpi_ioapic_lock);
#endif

	return ret;
}
EXPORT_SYMBOL(acpi_unregister_ioapic);

/**
 * acpi_ioapic_registered - Check whether IOAPIC associated with @gsi_base
 *			    has been registered
 * @handle:	ACPI handle of the IOAPIC device
 * @gsi_base:	GSI base associated with the IOAPIC
 *
 * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
 * with acpi_register_ioapic()/acpi_unregister_ioapic().
 */
int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
{
	int ret = 0;

#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
	mutex_lock(&acpi_ioapic_lock);
	ret  = mp_ioapic_registered(gsi_base);
	mutex_unlock(&acpi_ioapic_lock);
#endif

	return ret;
}

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

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

	return 0;
}

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

static struct resource *hpet_res __initdata;

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

	if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
		pr_warn("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) {
		pr_warn("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) {
			pr_warn("HPET id: %#x base: 0xfed0000000000000 is bogus, try hpet=force on the kernel command line to fix it up to 0xfed00000.\n",
				hpet_tbl->id);
			hpet_address = 0;
			return 0;
		}
		pr_warn("HPET id: %#x base: 0xfed0000000000000 fixed up to 0xfed00000.\n",
			hpet_tbl->id);
		hpet_address >>= 32;
	}
#endif
	pr_info("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 = memblock_alloc(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE,
				  SMP_CACHE_BYTES);
	if (!hpet_res)
		panic("%s: Failed to allocate %zu bytes\n", __func__,
		      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)
{
	if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
		pr_debug("no legacy devices present\n");
		x86_platform.legacy.devices.pnpbios = 0;
	}

	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
	    !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) &&
	    x86_platform.legacy.i8042 != X86_LEGACY_I8042_PLATFORM_ABSENT) {
		pr_debug("i8042 controller is absent\n");
		x86_platform.legacy.i8042 = X86_LEGACY_I8042_FIRMWARE_ABSENT;
	}

	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
		pr_debug("not registering RTC platform device\n");
		x86_platform.legacy.rtc = 0;
	}

	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_VGA) {
		pr_debug("probing for VGA not safe\n");
		x86_platform.legacy.no_vga = 1;
	}

#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)
		pr_info("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 (!boot_cpu_has(X86_FEATURE_APIC))
		return -ENODEV;

	/*
	 * Note that the LAPIC address is obtained from the MADT (32-bit value)
	 * and (optionally) overridden 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) {
		pr_err("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, x2count = 0;

	if (!boot_cpu_has(X86_FEATURE_APIC))
		return -ENODEV;

	count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
				      acpi_parse_sapic, MAX_LOCAL_APIC);

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

#ifdef CONFIG_X86_64
static int __init acpi_parse_mp_wake(union acpi_subtable_headers *header,
				     const unsigned long end)
{
	struct acpi_madt_multiproc_wakeup *mp_wake;

	if (!IS_ENABLED(CONFIG_SMP))
		return -ENODEV;

	mp_wake = (struct acpi_madt_multiproc_wakeup *)header;
	if (BAD_MADT_ENTRY(mp_wake, end))
		return -EINVAL;

	acpi_table_print_madt_entry(&header->common);

	acpi_mp_wake_mailbox_paddr = mp_wake->base_address;

	apic_update_callback(wakeup_secondary_cpu_64, acpi_wakeup_cpu);

	return 0;
}
#endif				/* CONFIG_X86_64 */
#endif				/* CONFIG_X86_LOCAL_APIC */

#ifdef	CONFIG_X86_IO_APIC
static 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 (nIRQs: %d)\n", MP_ISA_BUS, nr_legacy_irqs());

	/*
	 * Use the default configuration for the IRQs 0-15.  Unless
	 * overridden by (MADT) interrupt source override entries.
	 */
	for (i = 0; i < nr_legacy_irqs(); 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) {
			pr_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);
	}
}

/*
 * 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 (!boot_cpu_has(X86_FEATURE_APIC))
		return -ENODEV;

	/*
	 * if "noapic" boot option, don't look for IO-APICs
	 */
	if (ioapic_is_disabled) {
		pr_info("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) {
		pr_err("No IOAPIC entries present\n");
		return -ENODEV;
	} else if (count < 0) {
		pr_err("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) {
		pr_err("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.
	 * But ignore setting up SCI on hardware reduced platforms.
	 */
	if (acpi_sci_override_gsi == INVALID_ACPI_IRQ && !acpi_gbl_reduced_hardware)
		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) {
		pr_err("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.
			 */
			pr_err("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
			 */
			mutex_lock(&acpi_ioapic_lock);
			error = acpi_parse_madt_ioapic_entries();
			mutex_unlock(&acpi_ioapic_lock);
			if (!error) {
				acpi_set_irq_model_ioapic();

				smp_found_config = 1;
			}

#ifdef CONFIG_X86_64
			/*
			 * Parse MADT MP Wake entry.
			 */
			acpi_table_parse_madt(ACPI_MADT_TYPE_MULTIPROC_WAKEUP,
					      acpi_parse_mp_wake, 1);
#endif
		}
		if (error == -EINVAL) {
			/*
			 * Dell Precision Workstation 410, 610 come here.
			 */
			pr_err("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) {
			pr_warn("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)
		pr_info("Using ACPI (MADT) for SMP configuration information\n");
	else if (acpi_lapic)
		pr_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) {
		pr_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) {
		pr_notice("%s detected: force use of pci=noacpi\n", d->ident);
		acpi_disable_pci();
	}
	return 0;
}

static int __init disable_acpi_xsdt(const struct dmi_system_id *d)
{
	if (!acpi_force) {
		pr_notice("%s detected: force use of acpi=rsdt\n", d->ident);
		acpi_gbl_do_not_use_xsdt = TRUE;
	} else {
		pr_notice("Warning: DMI blacklist says broken, but acpi XSDT forced\n");
	}
	return 0;
}

static int __init dmi_disable_acpi(const struct dmi_system_id *d)
{
	if (!acpi_force) {
		pr_notice("%s detected: acpi off\n", d->ident);
		disable_acpi();
	} else {
		pr_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;
}

/*
 * ACPI offers an alternative platform interface model that removes
 * ACPI hardware requirements for platforms that do not implement
 * the PC Architecture.
 *
 * We initialize the Hardware-reduced ACPI model here:
 */
void __init acpi_generic_reduced_hw_init(void)
{
	/*
	 * Override x86_init functions and bypass legacy PIC in
	 * hardware reduced ACPI mode.
	 */
	x86_init.timers.timer_init	= x86_init_noop;
	x86_init.irqs.pre_vector_init	= x86_init_noop;
	legacy_pic			= &null_legacy_pic;
}

static void __init acpi_reduced_hw_init(void)
{
	if (acpi_gbl_reduced_hardware)
		x86_init.acpi.reduced_hw_early_init();
}

/*
 * If your system is blacklisted here, but you find that acpi=force
 * works for you, please contact linux-acpi@vger.kernel.org
 */
static const struct dmi_system_id acpi_dmi_table[] __initconst = {
	/*
	 * 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"),
		     },
	 },
	/*
	 * Boxes that need ACPI XSDT use disabled due to corrupted tables
	 */
	{
	 .callback = disable_acpi_xsdt,
	 .ident = "Advantech DAC-BJ01",
	 .matches = {
		     DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
		     DMI_MATCH(DMI_PRODUCT_NAME, "Bearlake CRB Board"),
		     DMI_MATCH(DMI_BIOS_VERSION, "V1.12"),
		     DMI_MATCH(DMI_BIOS_DATE, "02/01/2011"),
		     },
	 },
	{}
};

/* second table for DMI checks that should run after early-quirks */
static const struct dmi_system_id acpi_dmi_table_late[] __initconst = {
	/*
	 * 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_locate_initial_tables())
		disable_acpi();
	else
		acpi_reserve_initial_tables();
}

int __init early_acpi_boot_init(void)
{
	if (acpi_disabled)
		return 1;

	acpi_table_init_complete();

	acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);

	/*
	 * blacklist may disable ACPI entirely
	 */
	if (acpi_blacklisted()) {
		if (acpi_force) {
			pr_warn("acpi=force override\n");
		} else {
			pr_warn("Disabling ACPI support\n");
			disable_acpi();
			return 1;
		}
	}

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

	/*
	 * Hardware-reduced ACPI mode initialization:
	 */
	acpi_reduced_hw_init();

	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 (IS_ENABLED(CONFIG_ACPI_BGRT) && !acpi_nobgrt)
		acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);

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

	/* Do not enable ACPI SPCR console by default */
	acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
	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_gbl_do_not_use_xsdt = TRUE;
	}
	/* "acpi=noirq" disables ACPI interrupt routing */
	else if (strcmp(arg, "noirq") == 0) {
		acpi_noirq_set();
	}
	/* "acpi=copy_dsdt" copies DSDT */
	else if (strcmp(arg, "copy_dsdt") == 0) {
		acpi_gbl_copy_dsdt_locally = 1;
	}
	/* "acpi=nocmcff" disables FF mode for corrected errors */
	else if (strcmp(arg, "nocmcff") == 0) {
		acpi_disable_cmcff = 1;
	} else {
		/* Core will printk when we return error. */
		return -EINVAL;
	}
	return 0;
}
early_param("acpi", parse_acpi);

static int __init parse_acpi_bgrt(char *arg)
{
	acpi_nobgrt = true;
	return 0;
}
early_param("bgrt_disable", parse_acpi_bgrt);

/* 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) {
		pr_warn("MPS support code is not built-in, 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;

	old = READ_ONCE(*lock);
	do {
		val = (old >> 1) & 0x1;
		new = (old & ~0x3) + 2 + val;
	} while (!try_cmpxchg(lock, &old, new));

	if (val)
		return 0;

	return -1;
}

int __acpi_release_global_lock(unsigned int *lock)
{
	unsigned int old, new;

	old = READ_ONCE(*lock);
	do {
		new = old & ~0x3;
	} while (!try_cmpxchg(lock, &old, new));
	return old & 0x1;
}

void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
{
	e820__range_add(addr, size, E820_TYPE_NVS);
	e820__update_table_print();
}

void x86_default_set_root_pointer(u64 addr)
{
	boot_params.acpi_rsdp_addr = addr;
}

u64 x86_default_get_root_pointer(void)
{
	return boot_params.acpi_rsdp_addr;
}