Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 4130 insertions, 0 deletions

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
new file mode 100644
index 00000000..e88300d8
--- /dev/null
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -0,0 +1,4130 @@
+/*
+ *	Intel IO-APIC support for multi-Pentium hosts.
+ *
+ *	Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
+ *
+ *	Many thanks to Stig Venaas for trying out countless experimental
+ *	patches and reporting/debugging problems patiently!
+ *
+ *	(c) 1999, Multiple IO-APIC support, developed by
+ *	Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
+ *      Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
+ *	further tested and cleaned up by Zach Brown <zab@redhat.com>
+ *	and Ingo Molnar <mingo@redhat.com>
+ *
+ *	Fixes
+ *	Maciej W. Rozycki	:	Bits for genuine 82489DX APICs;
+ *					thanks to Eric Gilmore
+ *					and Rolf G. Tews
+ *					for testing these extensively
+ *	Paul Diefenbaugh	:	Added full ACPI support
+ */
+
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/mc146818rtc.h>
+#include <linux/compiler.h>
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/syscore_ops.h>
+#include <linux/msi.h>
+#include <linux/htirq.h>
+#include <linux/freezer.h>
+#include <linux/kthread.h>
+#include <linux/jiffies.h>	/* time_after() */
+#include <linux/slab.h>
+#ifdef CONFIG_ACPI
+#include <acpi/acpi_bus.h>
+#endif
+#include <linux/bootmem.h>
+#include <linux/dmar.h>
+#include <linux/hpet.h>
+
+#include <asm/idle.h>
+#include <asm/io.h>
+#include <asm/smp.h>
+#include <asm/cpu.h>
+#include <asm/desc.h>
+#include <asm/proto.h>
+#include <asm/acpi.h>
+#include <asm/dma.h>
+#include <asm/timer.h>
+#include <asm/i8259.h>
+#include <asm/msidef.h>
+#include <asm/hypertransport.h>
+#include <asm/setup.h>
+#include <asm/irq_remapping.h>
+#include <asm/hpet.h>
+#include <asm/hw_irq.h>
+
+#include <asm/apic.h>
+
+#define __apicdebuginit(type) static type __init
+
+#define for_each_irq_pin(entry, head) \
+	for (entry = head; entry; entry = entry->next)
+
+static void		__init __ioapic_init_mappings(void);
+
+static unsigned int	__io_apic_read  (unsigned int apic, unsigned int reg);
+static void		__io_apic_write (unsigned int apic, unsigned int reg, unsigned int val);
+static void		__io_apic_modify(unsigned int apic, unsigned int reg, unsigned int val);
+
+static struct io_apic_ops io_apic_ops = {
+	.init	= __ioapic_init_mappings,
+	.read	= __io_apic_read,
+	.write	= __io_apic_write,
+	.modify = __io_apic_modify,
+};
+
+void __init set_io_apic_ops(const struct io_apic_ops *ops)
+{
+	io_apic_ops = *ops;
+}
+
+/*
+ *      Is the SiS APIC rmw bug present ?
+ *      -1 = don't know, 0 = no, 1 = yes
+ */
+int sis_apic_bug = -1;
+
+static DEFINE_RAW_SPINLOCK(ioapic_lock);
+static DEFINE_RAW_SPINLOCK(vector_lock);
+
+static struct ioapic {
+	/*
+	 * # of IRQ routing registers
+	 */
+	int nr_registers;
+	/*
+	 * Saved state during suspend/resume, or while enabling intr-remap.
+	 */
+	struct IO_APIC_route_entry *saved_registers;
+	/* I/O APIC config */
+	struct mpc_ioapic mp_config;
+	/* IO APIC gsi routing info */
+	struct mp_ioapic_gsi  gsi_config;
+	DECLARE_BITMAP(pin_programmed, MP_MAX_IOAPIC_PIN + 1);
+} ioapics[MAX_IO_APICS];
+
+#define mpc_ioapic_ver(ioapic_idx)	ioapics[ioapic_idx].mp_config.apicver
+
+int mpc_ioapic_id(int ioapic_idx)
+{
+	return ioapics[ioapic_idx].mp_config.apicid;
+}
+
+unsigned int mpc_ioapic_addr(int ioapic_idx)
+{
+	return ioapics[ioapic_idx].mp_config.apicaddr;
+}
+
+struct mp_ioapic_gsi *mp_ioapic_gsi_routing(int ioapic_idx)
+{
+	return &ioapics[ioapic_idx].gsi_config;
+}
+
+int nr_ioapics;
+
+/* The one past the highest gsi number used */
+u32 gsi_top;
+
+/* MP IRQ source entries */
+struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
+
+/* # of MP IRQ source entries */
+int mp_irq_entries;
+
+/* GSI interrupts */
+static int nr_irqs_gsi = NR_IRQS_LEGACY;
+
+#if defined (CONFIG_MCA) || defined (CONFIG_EISA)
+int mp_bus_id_to_type[MAX_MP_BUSSES];
+#endif
+
+DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
+
+int skip_ioapic_setup;
+
+/**
+ * disable_ioapic_support() - disables ioapic support at runtime
+ */
+void disable_ioapic_support(void)
+{
+#ifdef CONFIG_PCI
+	noioapicquirk = 1;
+	noioapicreroute = -1;
+#endif
+	skip_ioapic_setup = 1;
+}
+
+static int __init parse_noapic(char *str)
+{
+	/* disable IO-APIC */
+	disable_ioapic_support();
+	return 0;
+}
+early_param("noapic", parse_noapic);
+
+static int io_apic_setup_irq_pin(unsigned int irq, int node,
+				 struct io_apic_irq_attr *attr);
+
+/* Will be called in mpparse/acpi/sfi codes for saving IRQ info */
+void mp_save_irq(struct mpc_intsrc *m)
+{
+	int i;
+
+	apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
+		" IRQ %02x, APIC ID %x, APIC INT %02x\n",
+		m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
+		m->srcbusirq, m->dstapic, m->dstirq);
+
+	for (i = 0; i < mp_irq_entries; i++) {
+		if (!memcmp(&mp_irqs[i], m, sizeof(*m)))
+			return;
+	}
+
+	memcpy(&mp_irqs[mp_irq_entries], m, sizeof(*m));
+	if (++mp_irq_entries == MAX_IRQ_SOURCES)
+		panic("Max # of irq sources exceeded!!\n");
+}
+
+struct irq_pin_list {
+	int apic, pin;
+	struct irq_pin_list *next;
+};
+
+static struct irq_pin_list *alloc_irq_pin_list(int node)
+{
+	return kzalloc_node(sizeof(struct irq_pin_list), GFP_KERNEL, node);
+}
+
+
+/* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
+static struct irq_cfg irq_cfgx[NR_IRQS_LEGACY];
+
+int __init arch_early_irq_init(void)
+{
+	struct irq_cfg *cfg;
+	int count, node, i;
+
+	if (!legacy_pic->nr_legacy_irqs)
+		io_apic_irqs = ~0UL;
+
+	for (i = 0; i < nr_ioapics; i++) {
+		ioapics[i].saved_registers =
+			kzalloc(sizeof(struct IO_APIC_route_entry) *
+				ioapics[i].nr_registers, GFP_KERNEL);
+		if (!ioapics[i].saved_registers)
+			pr_err("IOAPIC %d: suspend/resume impossible!\n", i);
+	}
+
+	cfg = irq_cfgx;
+	count = ARRAY_SIZE(irq_cfgx);
+	node = cpu_to_node(0);
+
+	/* Make sure the legacy interrupts are marked in the bitmap */
+	irq_reserve_irqs(0, legacy_pic->nr_legacy_irqs);
+
+	for (i = 0; i < count; i++) {
+		irq_set_chip_data(i, &cfg[i]);
+		zalloc_cpumask_var_node(&cfg[i].domain, GFP_KERNEL, node);
+		zalloc_cpumask_var_node(&cfg[i].old_domain, GFP_KERNEL, node);
+		/*
+		 * For legacy IRQ's, start with assigning irq0 to irq15 to
+		 * IRQ0_VECTOR to IRQ15_VECTOR on cpu 0.
+		 */
+		if (i < legacy_pic->nr_legacy_irqs) {
+			cfg[i].vector = IRQ0_VECTOR + i;
+			cpumask_set_cpu(0, cfg[i].domain);
+		}
+	}
+
+	return 0;
+}
+
+static struct irq_cfg *irq_cfg(unsigned int irq)
+{
+	return irq_get_chip_data(irq);
+}
+
+static struct irq_cfg *alloc_irq_cfg(unsigned int irq, int node)
+{
+	struct irq_cfg *cfg;
+
+	cfg = kzalloc_node(sizeof(*cfg), GFP_KERNEL, node);
+	if (!cfg)
+		return NULL;
+	if (!zalloc_cpumask_var_node(&cfg->domain, GFP_KERNEL, node))
+		goto out_cfg;
+	if (!zalloc_cpumask_var_node(&cfg->old_domain, GFP_KERNEL, node))
+		goto out_domain;
+	return cfg;
+out_domain:
+	free_cpumask_var(cfg->domain);
+out_cfg:
+	kfree(cfg);
+	return NULL;
+}
+
+static void free_irq_cfg(unsigned int at, struct irq_cfg *cfg)
+{
+	if (!cfg)
+		return;
+	irq_set_chip_data(at, NULL);
+	free_cpumask_var(cfg->domain);
+	free_cpumask_var(cfg->old_domain);
+	kfree(cfg);
+}
+
+static struct irq_cfg *alloc_irq_and_cfg_at(unsigned int at, int node)
+{
+	int res = irq_alloc_desc_at(at, node);
+	struct irq_cfg *cfg;
+
+	if (res < 0) {
+		if (res != -EEXIST)
+			return NULL;
+		cfg = irq_get_chip_data(at);
+		if (cfg)
+			return cfg;
+	}
+
+	cfg = alloc_irq_cfg(at, node);
+	if (cfg)
+		irq_set_chip_data(at, cfg);
+	else
+		irq_free_desc(at);
+	return cfg;
+}
+
+static int alloc_irq_from(unsigned int from, int node)
+{
+	return irq_alloc_desc_from(from, node);
+}
+
+static void free_irq_at(unsigned int at, struct irq_cfg *cfg)
+{
+	free_irq_cfg(at, cfg);
+	irq_free_desc(at);
+}
+
+static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
+{
+	return io_apic_ops.read(apic, reg);
+}
+
+static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
+{
+	io_apic_ops.write(apic, reg, value);
+}
+
+static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
+{
+	io_apic_ops.modify(apic, reg, value);
+}
+
+
+struct io_apic {
+	unsigned int index;
+	unsigned int unused[3];
+	unsigned int data;
+	unsigned int unused2[11];
+	unsigned int eoi;
+};
+
+static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
+{
+	return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
+		+ (mpc_ioapic_addr(idx) & ~PAGE_MASK);
+}
+
+static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
+{
+	struct io_apic __iomem *io_apic = io_apic_base(apic);
+	writel(vector, &io_apic->eoi);
+}
+
+static unsigned int __io_apic_read(unsigned int apic, unsigned int reg)
+{
+	struct io_apic __iomem *io_apic = io_apic_base(apic);
+	writel(reg, &io_apic->index);
+	return readl(&io_apic->data);
+}
+
+static void __io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
+{
+	struct io_apic __iomem *io_apic = io_apic_base(apic);
+
+	writel(reg, &io_apic->index);
+	writel(value, &io_apic->data);
+}
+
+/*
+ * Re-write a value: to be used for read-modify-write
+ * cycles where the read already set up the index register.
+ *
+ * Older SiS APIC requires we rewrite the index register
+ */
+static void __io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
+{
+	struct io_apic __iomem *io_apic = io_apic_base(apic);
+
+	if (sis_apic_bug)
+		writel(reg, &io_apic->index);
+	writel(value, &io_apic->data);
+}
+
+static bool io_apic_level_ack_pending(struct irq_cfg *cfg)
+{
+	struct irq_pin_list *entry;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	for_each_irq_pin(entry, cfg->irq_2_pin) {
+		unsigned int reg;
+		int pin;
+
+		pin = entry->pin;
+		reg = io_apic_read(entry->apic, 0x10 + pin*2);
+		/* Is the remote IRR bit set? */
+		if (reg & IO_APIC_REDIR_REMOTE_IRR) {
+			raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+			return true;
+		}
+	}
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+
+	return false;
+}
+
+union entry_union {
+	struct { u32 w1, w2; };
+	struct IO_APIC_route_entry entry;
+};
+
+static struct IO_APIC_route_entry __ioapic_read_entry(int apic, int pin)
+{
+	union entry_union eu;
+
+	eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
+	eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
+
+	return eu.entry;
+}
+
+static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
+{
+	union entry_union eu;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	eu.entry = __ioapic_read_entry(apic, pin);
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+
+	return eu.entry;
+}
+
+/*
+ * When we write a new IO APIC routing entry, we need to write the high
+ * word first! If the mask bit in the low word is clear, we will enable
+ * the interrupt, and we need to make sure the entry is fully populated
+ * before that happens.
+ */
+static void __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
+{
+	union entry_union eu = {{0, 0}};
+
+	eu.entry = e;
+	io_apic_write(apic, 0x11 + 2*pin, eu.w2);
+	io_apic_write(apic, 0x10 + 2*pin, eu.w1);
+}
+
+static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	__ioapic_write_entry(apic, pin, e);
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+/*
+ * When we mask an IO APIC routing entry, we need to write the low
+ * word first, in order to set the mask bit before we change the
+ * high bits!
+ */
+static void ioapic_mask_entry(int apic, int pin)
+{
+	unsigned long flags;
+	union entry_union eu = { .entry.mask = 1 };
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	io_apic_write(apic, 0x10 + 2*pin, eu.w1);
+	io_apic_write(apic, 0x11 + 2*pin, eu.w2);
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+/*
+ * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
+ * shared ISA-space IRQs, so we have to support them. We are super
+ * fast in the common case, and fast for shared ISA-space IRQs.
+ */
+static int __add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
+{
+	struct irq_pin_list **last, *entry;
+
+	/* don't allow duplicates */
+	last = &cfg->irq_2_pin;
+	for_each_irq_pin(entry, cfg->irq_2_pin) {
+		if (entry->apic == apic && entry->pin == pin)
+			return 0;
+		last = &entry->next;
+	}
+
+	entry = alloc_irq_pin_list(node);
+	if (!entry) {
+		printk(KERN_ERR "can not alloc irq_pin_list (%d,%d,%d)\n",
+				node, apic, pin);
+		return -ENOMEM;
+	}
+	entry->apic = apic;
+	entry->pin = pin;
+
+	*last = entry;
+	return 0;
+}
+
+static void add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
+{
+	if (__add_pin_to_irq_node(cfg, node, apic, pin))
+		panic("IO-APIC: failed to add irq-pin. Can not proceed\n");
+}
+
+/*
+ * Reroute an IRQ to a different pin.
+ */
+static void __init replace_pin_at_irq_node(struct irq_cfg *cfg, int node,
+					   int oldapic, int oldpin,
+					   int newapic, int newpin)
+{
+	struct irq_pin_list *entry;
+
+	for_each_irq_pin(entry, cfg->irq_2_pin) {
+		if (entry->apic == oldapic && entry->pin == oldpin) {
+			entry->apic = newapic;
+			entry->pin = newpin;
+			/* every one is different, right? */
+			return;
+		}
+	}
+
+	/* old apic/pin didn't exist, so just add new ones */
+	add_pin_to_irq_node(cfg, node, newapic, newpin);
+}
+
+static void __io_apic_modify_irq(struct irq_pin_list *entry,
+				 int mask_and, int mask_or,
+				 void (*final)(struct irq_pin_list *entry))
+{
+	unsigned int reg, pin;
+
+	pin = entry->pin;
+	reg = io_apic_read(entry->apic, 0x10 + pin * 2);
+	reg &= mask_and;
+	reg |= mask_or;
+	io_apic_modify(entry->apic, 0x10 + pin * 2, reg);
+	if (final)
+		final(entry);
+}
+
+static void io_apic_modify_irq(struct irq_cfg *cfg,
+			       int mask_and, int mask_or,
+			       void (*final)(struct irq_pin_list *entry))
+{
+	struct irq_pin_list *entry;
+
+	for_each_irq_pin(entry, cfg->irq_2_pin)
+		__io_apic_modify_irq(entry, mask_and, mask_or, final);
+}
+
+static void io_apic_sync(struct irq_pin_list *entry)
+{
+	/*
+	 * Synchronize the IO-APIC and the CPU by doing
+	 * a dummy read from the IO-APIC
+	 */
+	struct io_apic __iomem *io_apic;
+
+	io_apic = io_apic_base(entry->apic);
+	readl(&io_apic->data);
+}
+
+static void mask_ioapic(struct irq_cfg *cfg)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	io_apic_modify_irq(cfg, ~0, IO_APIC_REDIR_MASKED, &io_apic_sync);
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+static void mask_ioapic_irq(struct irq_data *data)
+{
+	mask_ioapic(data->chip_data);
+}
+
+static void __unmask_ioapic(struct irq_cfg *cfg)
+{
+	io_apic_modify_irq(cfg, ~IO_APIC_REDIR_MASKED, 0, NULL);
+}
+
+static void unmask_ioapic(struct irq_cfg *cfg)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	__unmask_ioapic(cfg);
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+static void unmask_ioapic_irq(struct irq_data *data)
+{
+	unmask_ioapic(data->chip_data);
+}
+
+/*
+ * IO-APIC versions below 0x20 don't support EOI register.
+ * For the record, here is the information about various versions:
+ *     0Xh     82489DX
+ *     1Xh     I/OAPIC or I/O(x)APIC which are not PCI 2.2 Compliant
+ *     2Xh     I/O(x)APIC which is PCI 2.2 Compliant
+ *     30h-FFh Reserved
+ *
+ * Some of the Intel ICH Specs (ICH2 to ICH5) documents the io-apic
+ * version as 0x2. This is an error with documentation and these ICH chips
+ * use io-apic's of version 0x20.
+ *
+ * For IO-APIC's with EOI register, we use that to do an explicit EOI.
+ * Otherwise, we simulate the EOI message manually by changing the trigger
+ * mode to edge and then back to level, with RTE being masked during this.
+ */
+static void __eoi_ioapic_pin(int apic, int pin, int vector, struct irq_cfg *cfg)
+{
+	if (mpc_ioapic_ver(apic) >= 0x20) {
+		/*
+		 * Intr-remapping uses pin number as the virtual vector
+		 * in the RTE. Actual vector is programmed in
+		 * intr-remapping table entry. Hence for the io-apic
+		 * EOI we use the pin number.
+		 */
+		if (cfg && irq_remapped(cfg))
+			io_apic_eoi(apic, pin);
+		else
+			io_apic_eoi(apic, vector);
+	} else {
+		struct IO_APIC_route_entry entry, entry1;
+
+		entry = entry1 = __ioapic_read_entry(apic, pin);
+
+		/*
+		 * Mask the entry and change the trigger mode to edge.
+		 */
+		entry1.mask = 1;
+		entry1.trigger = IOAPIC_EDGE;
+
+		__ioapic_write_entry(apic, pin, entry1);
+
+		/*
+		 * Restore the previous level triggered entry.
+		 */
+		__ioapic_write_entry(apic, pin, entry);
+	}
+}
+
+static void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg)
+{
+	struct irq_pin_list *entry;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	for_each_irq_pin(entry, cfg->irq_2_pin)
+		__eoi_ioapic_pin(entry->apic, entry->pin, cfg->vector, cfg);
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
+{
+	struct IO_APIC_route_entry entry;
+
+	/* Check delivery_mode to be sure we're not clearing an SMI pin */
+	entry = ioapic_read_entry(apic, pin);
+	if (entry.delivery_mode == dest_SMI)
+		return;
+
+	/*
+	 * Make sure the entry is masked and re-read the contents to check
+	 * if it is a level triggered pin and if the remote-IRR is set.
+	 */
+	if (!entry.mask) {
+		entry.mask = 1;
+		ioapic_write_entry(apic, pin, entry);
+		entry = ioapic_read_entry(apic, pin);
+	}
+
+	if (entry.irr) {
+		unsigned long flags;
+
+		/*
+		 * Make sure the trigger mode is set to level. Explicit EOI
+		 * doesn't clear the remote-IRR if the trigger mode is not
+		 * set to level.
+		 */
+		if (!entry.trigger) {
+			entry.trigger = IOAPIC_LEVEL;
+			ioapic_write_entry(apic, pin, entry);
+		}
+
+		raw_spin_lock_irqsave(&ioapic_lock, flags);
+		__eoi_ioapic_pin(apic, pin, entry.vector, NULL);
+		raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+	}
+
+	/*
+	 * Clear the rest of the bits in the IO-APIC RTE except for the mask
+	 * bit.
+	 */
+	ioapic_mask_entry(apic, pin);
+	entry = ioapic_read_entry(apic, pin);
+	if (entry.irr)
+		printk(KERN_ERR "Unable to reset IRR for apic: %d, pin :%d\n",
+		       mpc_ioapic_id(apic), pin);
+}
+
+static void clear_IO_APIC (void)
+{
+	int apic, pin;
+
+	for (apic = 0; apic < nr_ioapics; apic++)
+		for (pin = 0; pin < ioapics[apic].nr_registers; pin++)
+			clear_IO_APIC_pin(apic, pin);
+}
+
+#ifdef CONFIG_X86_32
+/*
+ * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
+ * specific CPU-side IRQs.
+ */
+
+#define MAX_PIRQS 8
+static int pirq_entries[MAX_PIRQS] = {
+	[0 ... MAX_PIRQS - 1] = -1
+};
+
+static int __init ioapic_pirq_setup(char *str)
+{
+	int i, max;
+	int ints[MAX_PIRQS+1];
+
+	get_options(str, ARRAY_SIZE(ints), ints);
+
+	apic_printk(APIC_VERBOSE, KERN_INFO
+			"PIRQ redirection, working around broken MP-BIOS.\n");
+	max = MAX_PIRQS;
+	if (ints[0] < MAX_PIRQS)
+		max = ints[0];
+
+	for (i = 0; i < max; i++) {
+		apic_printk(APIC_VERBOSE, KERN_DEBUG
+				"... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
+		/*
+		 * PIRQs are mapped upside down, usually.
+		 */
+		pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
+	}
+	return 1;
+}
+
+__setup("pirq=", ioapic_pirq_setup);
+#endif /* CONFIG_X86_32 */
+
+/*
+ * Saves all the IO-APIC RTE's
+ */
+int save_ioapic_entries(void)
+{
+	int apic, pin;
+	int err = 0;
+
+	for (apic = 0; apic < nr_ioapics; apic++) {
+		if (!ioapics[apic].saved_registers) {
+			err = -ENOMEM;
+			continue;
+		}
+
+		for (pin = 0; pin < ioapics[apic].nr_registers; pin++)
+			ioapics[apic].saved_registers[pin] =
+				ioapic_read_entry(apic, pin);
+	}
+
+	return err;
+}
+
+/*
+ * Mask all IO APIC entries.
+ */
+void mask_ioapic_entries(void)
+{
+	int apic, pin;
+
+	for (apic = 0; apic < nr_ioapics; apic++) {
+		if (!ioapics[apic].saved_registers)
+			continue;
+
+		for (pin = 0; pin < ioapics[apic].nr_registers; pin++) {
+			struct IO_APIC_route_entry entry;
+
+			entry = ioapics[apic].saved_registers[pin];
+			if (!entry.mask) {
+				entry.mask = 1;
+				ioapic_write_entry(apic, pin, entry);
+			}
+		}
+	}
+}
+
+/*
+ * Restore IO APIC entries which was saved in the ioapic structure.
+ */
+int restore_ioapic_entries(void)
+{
+	int apic, pin;
+
+	for (apic = 0; apic < nr_ioapics; apic++) {
+		if (!ioapics[apic].saved_registers)
+			continue;
+
+		for (pin = 0; pin < ioapics[apic].nr_registers; pin++)
+			ioapic_write_entry(apic, pin,
+					   ioapics[apic].saved_registers[pin]);
+	}
+	return 0;
+}
+
+/*
+ * Find the IRQ entry number of a certain pin.
+ */
+static int find_irq_entry(int ioapic_idx, int pin, int type)
+{
+	int i;
+
+	for (i = 0; i < mp_irq_entries; i++)
+		if (mp_irqs[i].irqtype == type &&
+		    (mp_irqs[i].dstapic == mpc_ioapic_id(ioapic_idx) ||
+		     mp_irqs[i].dstapic == MP_APIC_ALL) &&
+		    mp_irqs[i].dstirq == pin)
+			return i;
+
+	return -1;
+}
+
+/*
+ * Find the pin to which IRQ[irq] (ISA) is connected
+ */
+static int __init find_isa_irq_pin(int irq, int type)
+{
+	int i;
+
+	for (i = 0; i < mp_irq_entries; i++) {
+		int lbus = mp_irqs[i].srcbus;
+
+		if (test_bit(lbus, mp_bus_not_pci) &&
+		    (mp_irqs[i].irqtype == type) &&
+		    (mp_irqs[i].srcbusirq == irq))
+
+			return mp_irqs[i].dstirq;
+	}
+	return -1;
+}
+
+static int __init find_isa_irq_apic(int irq, int type)
+{
+	int i;
+
+	for (i = 0; i < mp_irq_entries; i++) {
+		int lbus = mp_irqs[i].srcbus;
+
+		if (test_bit(lbus, mp_bus_not_pci) &&
+		    (mp_irqs[i].irqtype == type) &&
+		    (mp_irqs[i].srcbusirq == irq))
+			break;
+	}
+
+	if (i < mp_irq_entries) {
+		int ioapic_idx;
+
+		for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++)
+			if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic)
+				return ioapic_idx;
+	}
+
+	return -1;
+}
+
+#if defined(CONFIG_EISA) || defined(CONFIG_MCA)
+/*
+ * EISA Edge/Level control register, ELCR
+ */
+static int EISA_ELCR(unsigned int irq)
+{
+	if (irq < legacy_pic->nr_legacy_irqs) {
+		unsigned int port = 0x4d0 + (irq >> 3);
+		return (inb(port) >> (irq & 7)) & 1;
+	}
+	apic_printk(APIC_VERBOSE, KERN_INFO
+			"Broken MPtable reports ISA irq %d\n", irq);
+	return 0;
+}
+
+#endif
+
+/* ISA interrupts are always polarity zero edge triggered,
+ * when listed as conforming in the MP table. */
+
+#define default_ISA_trigger(idx)	(0)
+#define default_ISA_polarity(idx)	(0)
+
+/* EISA interrupts are always polarity zero and can be edge or level
+ * trigger depending on the ELCR value.  If an interrupt is listed as
+ * EISA conforming in the MP table, that means its trigger type must
+ * be read in from the ELCR */
+
+#define default_EISA_trigger(idx)	(EISA_ELCR(mp_irqs[idx].srcbusirq))
+#define default_EISA_polarity(idx)	default_ISA_polarity(idx)
+
+/* PCI interrupts are always polarity one level triggered,
+ * when listed as conforming in the MP table. */
+
+#define default_PCI_trigger(idx)	(1)
+#define default_PCI_polarity(idx)	(1)
+
+/* MCA interrupts are always polarity zero level triggered,
+ * when listed as conforming in the MP table. */
+
+#define default_MCA_trigger(idx)	(1)
+#define default_MCA_polarity(idx)	default_ISA_polarity(idx)
+
+static int irq_polarity(int idx)
+{
+	int bus = mp_irqs[idx].srcbus;
+	int polarity;
+
+	/*
+	 * Determine IRQ line polarity (high active or low active):
+	 */
+	switch (mp_irqs[idx].irqflag & 3)
+	{
+		case 0: /* conforms, ie. bus-type dependent polarity */
+			if (test_bit(bus, mp_bus_not_pci))
+				polarity = default_ISA_polarity(idx);
+			else
+				polarity = default_PCI_polarity(idx);
+			break;
+		case 1: /* high active */
+		{
+			polarity = 0;
+			break;
+		}
+		case 2: /* reserved */
+		{
+			printk(KERN_WARNING "broken BIOS!!\n");
+			polarity = 1;
+			break;
+		}
+		case 3: /* low active */
+		{
+			polarity = 1;
+			break;
+		}
+		default: /* invalid */
+		{
+			printk(KERN_WARNING "broken BIOS!!\n");
+			polarity = 1;
+			break;
+		}
+	}
+	return polarity;
+}
+
+static int irq_trigger(int idx)
+{
+	int bus = mp_irqs[idx].srcbus;
+	int trigger;
+
+	/*
+	 * Determine IRQ trigger mode (edge or level sensitive):
+	 */
+	switch ((mp_irqs[idx].irqflag>>2) & 3)
+	{
+		case 0: /* conforms, ie. bus-type dependent */
+			if (test_bit(bus, mp_bus_not_pci))
+				trigger = default_ISA_trigger(idx);
+			else
+				trigger = default_PCI_trigger(idx);
+#if defined(CONFIG_EISA) || defined(CONFIG_MCA)
+			switch (mp_bus_id_to_type[bus]) {
+				case MP_BUS_ISA: /* ISA pin */
+				{
+					/* set before the switch */
+					break;
+				}
+				case MP_BUS_EISA: /* EISA pin */
+				{
+					trigger = default_EISA_trigger(idx);
+					break;
+				}
+				case MP_BUS_PCI: /* PCI pin */
+				{
+					/* set before the switch */
+					break;
+				}
+				case MP_BUS_MCA: /* MCA pin */
+				{
+					trigger = default_MCA_trigger(idx);
+					break;
+				}
+				default:
+				{
+					printk(KERN_WARNING "broken BIOS!!\n");
+					trigger = 1;
+					break;
+				}
+			}
+#endif
+			break;
+		case 1: /* edge */
+		{
+			trigger = 0;
+			break;
+		}
+		case 2: /* reserved */
+		{
+			printk(KERN_WARNING "broken BIOS!!\n");
+			trigger = 1;
+			break;
+		}
+		case 3: /* level */
+		{
+			trigger = 1;
+			break;
+		}
+		default: /* invalid */
+		{
+			printk(KERN_WARNING "broken BIOS!!\n");
+			trigger = 0;
+			break;
+		}
+	}
+	return trigger;
+}
+
+static int pin_2_irq(int idx, int apic, int pin)
+{
+	int irq;
+	int bus = mp_irqs[idx].srcbus;
+	struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(apic);
+
+	/*
+	 * Debugging check, we are in big trouble if this message pops up!
+	 */
+	if (mp_irqs[idx].dstirq != pin)
+		printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
+
+	if (test_bit(bus, mp_bus_not_pci)) {
+		irq = mp_irqs[idx].srcbusirq;
+	} else {
+		u32 gsi = gsi_cfg->gsi_base + pin;
+
+		if (gsi >= NR_IRQS_LEGACY)
+			irq = gsi;
+		else
+			irq = gsi_top + gsi;
+	}
+
+#ifdef CONFIG_X86_32
+	/*
+	 * PCI IRQ command line redirection. Yes, limits are hardcoded.
+	 */
+	if ((pin >= 16) && (pin <= 23)) {
+		if (pirq_entries[pin-16] != -1) {
+			if (!pirq_entries[pin-16]) {
+				apic_printk(APIC_VERBOSE, KERN_DEBUG
+						"disabling PIRQ%d\n", pin-16);
+			} else {
+				irq = pirq_entries[pin-16];
+				apic_printk(APIC_VERBOSE, KERN_DEBUG
+						"using PIRQ%d -> IRQ %d\n",
+						pin-16, irq);
+			}
+		}
+	}
+#endif
+
+	return irq;
+}
+
+/*
+ * Find a specific PCI IRQ entry.
+ * Not an __init, possibly needed by modules
+ */
+int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin,
+				struct io_apic_irq_attr *irq_attr)
+{
+	int ioapic_idx, i, best_guess = -1;
+
+	apic_printk(APIC_DEBUG,
+		    "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
+		    bus, slot, pin);
+	if (test_bit(bus, mp_bus_not_pci)) {
+		apic_printk(APIC_VERBOSE,
+			    "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
+		return -1;
+	}
+	for (i = 0; i < mp_irq_entries; i++) {
+		int lbus = mp_irqs[i].srcbus;
+
+		for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++)
+			if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic ||
+			    mp_irqs[i].dstapic == MP_APIC_ALL)
+				break;
+
+		if (!test_bit(lbus, mp_bus_not_pci) &&
+		    !mp_irqs[i].irqtype &&
+		    (bus == lbus) &&
+		    (slot == ((mp_irqs[i].srcbusirq >> 2) & 0x1f))) {
+			int irq = pin_2_irq(i, ioapic_idx, mp_irqs[i].dstirq);
+
+			if (!(ioapic_idx || IO_APIC_IRQ(irq)))
+				continue;
+
+			if (pin == (mp_irqs[i].srcbusirq & 3)) {
+				set_io_apic_irq_attr(irq_attr, ioapic_idx,
+						     mp_irqs[i].dstirq,
+						     irq_trigger(i),
+						     irq_polarity(i));
+				return irq;
+			}
+			/*
+			 * Use the first all-but-pin matching entry as a
+			 * best-guess fuzzy result for broken mptables.
+			 */
+			if (best_guess < 0) {
+				set_io_apic_irq_attr(irq_attr, ioapic_idx,
+						     mp_irqs[i].dstirq,
+						     irq_trigger(i),
+						     irq_polarity(i));
+				best_guess = irq;
+			}
+		}
+	}
+	return best_guess;
+}
+EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
+
+void lock_vector_lock(void)
+{
+	/* Used to the online set of cpus does not change
+	 * during assign_irq_vector.
+	 */
+	raw_spin_lock(&vector_lock);
+}
+
+void unlock_vector_lock(void)
+{
+	raw_spin_unlock(&vector_lock);
+}
+
+static int
+__assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
+{
+	/*
+	 * NOTE! The local APIC isn't very good at handling
+	 * multiple interrupts at the same interrupt level.
+	 * As the interrupt level is determined by taking the
+	 * vector number and shifting that right by 4, we
+	 * want to spread these out a bit so that they don't
+	 * all fall in the same interrupt level.
+	 *
+	 * Also, we've got to be careful not to trash gate
+	 * 0x80, because int 0x80 is hm, kind of importantish. ;)
+	 */
+	static int current_vector = FIRST_EXTERNAL_VECTOR + VECTOR_OFFSET_START;
+	static int current_offset = VECTOR_OFFSET_START % 8;
+	unsigned int old_vector;
+	int cpu, err;
+	cpumask_var_t tmp_mask;
+
+	if (cfg->move_in_progress)
+		return -EBUSY;
+
+	if (!alloc_cpumask_var(&tmp_mask, GFP_ATOMIC))
+		return -ENOMEM;
+
+	old_vector = cfg->vector;
+	if (old_vector) {
+		cpumask_and(tmp_mask, mask, cpu_online_mask);
+		cpumask_and(tmp_mask, cfg->domain, tmp_mask);
+		if (!cpumask_empty(tmp_mask)) {
+			free_cpumask_var(tmp_mask);
+			return 0;
+		}
+	}
+
+	/* Only try and allocate irqs on cpus that are present */
+	err = -ENOSPC;
+	for_each_cpu_and(cpu, mask, cpu_online_mask) {
+		int new_cpu;
+		int vector, offset;
+
+		apic->vector_allocation_domain(cpu, tmp_mask);
+
+		vector = current_vector;
+		offset = current_offset;
+next:
+		vector += 8;
+		if (vector >= first_system_vector) {
+			/* If out of vectors on large boxen, must share them. */
+			offset = (offset + 1) % 8;
+			vector = FIRST_EXTERNAL_VECTOR + offset;
+		}
+		if (unlikely(current_vector == vector))
+			continue;
+
+		if (test_bit(vector, used_vectors))
+			goto next;
+
+		for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask)
+			if (per_cpu(vector_irq, new_cpu)[vector] != -1)
+				goto next;
+		/* Found one! */
+		current_vector = vector;
+		current_offset = offset;
+		if (old_vector) {
+			cfg->move_in_progress = 1;
+			cpumask_copy(cfg->old_domain, cfg->domain);
+		}
+		for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask)
+			per_cpu(vector_irq, new_cpu)[vector] = irq;
+		cfg->vector = vector;
+		cpumask_copy(cfg->domain, tmp_mask);
+		err = 0;
+		break;
+	}
+	free_cpumask_var(tmp_mask);
+	return err;
+}
+
+int assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
+{
+	int err;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&vector_lock, flags);
+	err = __assign_irq_vector(irq, cfg, mask);
+	raw_spin_unlock_irqrestore(&vector_lock, flags);
+	return err;
+}
+
+static void __clear_irq_vector(int irq, struct irq_cfg *cfg)
+{
+	int cpu, vector;
+
+	BUG_ON(!cfg->vector);
+
+	vector = cfg->vector;
+	for_each_cpu_and(cpu, cfg->domain, cpu_online_mask)
+		per_cpu(vector_irq, cpu)[vector] = -1;
+
+	cfg->vector = 0;
+	cpumask_clear(cfg->domain);
+
+	if (likely(!cfg->move_in_progress))
+		return;
+	for_each_cpu_and(cpu, cfg->old_domain, cpu_online_mask) {
+		for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS;
+								vector++) {
+			if (per_cpu(vector_irq, cpu)[vector] != irq)
+				continue;
+			per_cpu(vector_irq, cpu)[vector] = -1;
+			break;
+		}
+	}
+	cfg->move_in_progress = 0;
+}
+
+void __setup_vector_irq(int cpu)
+{
+	/* Initialize vector_irq on a new cpu */
+	int irq, vector;
+	struct irq_cfg *cfg;
+
+	/*
+	 * vector_lock will make sure that we don't run into irq vector
+	 * assignments that might be happening on another cpu in parallel,
+	 * while we setup our initial vector to irq mappings.
+	 */
+	raw_spin_lock(&vector_lock);
+	/* Mark the inuse vectors */
+	for_each_active_irq(irq) {
+		cfg = irq_get_chip_data(irq);
+		if (!cfg)
+			continue;
+		/*
+		 * If it is a legacy IRQ handled by the legacy PIC, this cpu
+		 * will be part of the irq_cfg's domain.
+		 */
+		if (irq < legacy_pic->nr_legacy_irqs && !IO_APIC_IRQ(irq))
+			cpumask_set_cpu(cpu, cfg->domain);
+
+		if (!cpumask_test_cpu(cpu, cfg->domain))
+			continue;
+		vector = cfg->vector;
+		per_cpu(vector_irq, cpu)[vector] = irq;
+	}
+	/* Mark the free vectors */
+	for (vector = 0; vector < NR_VECTORS; ++vector) {
+		irq = per_cpu(vector_irq, cpu)[vector];
+		if (irq < 0)
+			continue;
+
+		cfg = irq_cfg(irq);
+		if (!cpumask_test_cpu(cpu, cfg->domain))
+			per_cpu(vector_irq, cpu)[vector] = -1;
+	}
+	raw_spin_unlock(&vector_lock);
+}
+
+static struct irq_chip ioapic_chip;
+
+#ifdef CONFIG_X86_32
+static inline int IO_APIC_irq_trigger(int irq)
+{
+	int apic, idx, pin;
+
+	for (apic = 0; apic < nr_ioapics; apic++) {
+		for (pin = 0; pin < ioapics[apic].nr_registers; pin++) {
+			idx = find_irq_entry(apic, pin, mp_INT);
+			if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin)))
+				return irq_trigger(idx);
+		}
+	}
+	/*
+         * nonexistent IRQs are edge default
+         */
+	return 0;
+}
+#else
+static inline int IO_APIC_irq_trigger(int irq)
+{
+	return 1;
+}
+#endif
+
+static void ioapic_register_intr(unsigned int irq, struct irq_cfg *cfg,
+				 unsigned long trigger)
+{
+	struct irq_chip *chip = &ioapic_chip;
+	irq_flow_handler_t hdl;
+	bool fasteoi;
+
+	if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
+	    trigger == IOAPIC_LEVEL) {
+		irq_set_status_flags(irq, IRQ_LEVEL);
+		fasteoi = true;
+	} else {
+		irq_clear_status_flags(irq, IRQ_LEVEL);
+		fasteoi = false;
+	}
+
+	if (irq_remapped(cfg)) {
+		irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
+		irq_remap_modify_chip_defaults(chip);
+		fasteoi = trigger != 0;
+	}
+
+	hdl = fasteoi ? handle_fasteoi_irq : handle_edge_irq;
+	irq_set_chip_and_handler_name(irq, chip, hdl,
+				      fasteoi ? "fasteoi" : "edge");
+}
+
+
+static int setup_ir_ioapic_entry(int irq,
+			      struct IR_IO_APIC_route_entry *entry,
+			      unsigned int destination, int vector,
+			      struct io_apic_irq_attr *attr)
+{
+	int index;
+	struct irte irte;
+	int ioapic_id = mpc_ioapic_id(attr->ioapic);
+	struct intel_iommu *iommu = map_ioapic_to_ir(ioapic_id);
+
+	if (!iommu) {
+		pr_warn("No mapping iommu for ioapic %d\n", ioapic_id);
+		return -ENODEV;
+	}
+
+	index = alloc_irte(iommu, irq, 1);
+	if (index < 0) {
+		pr_warn("Failed to allocate IRTE for ioapic %d\n", ioapic_id);
+		return -ENOMEM;
+	}
+
+	prepare_irte(&irte, vector, destination);
+
+	/* Set source-id of interrupt request */
+	set_ioapic_sid(&irte, ioapic_id);
+
+	modify_irte(irq, &irte);
+
+	apic_printk(APIC_VERBOSE, KERN_DEBUG "IOAPIC[%d]: "
+		"Set IRTE entry (P:%d FPD:%d Dst_Mode:%d "
+		"Redir_hint:%d Trig_Mode:%d Dlvry_Mode:%X "
+		"Avail:%X Vector:%02X Dest:%08X "
+		"SID:%04X SQ:%X SVT:%X)\n",
+		attr->ioapic, irte.present, irte.fpd, irte.dst_mode,
+		irte.redir_hint, irte.trigger_mode, irte.dlvry_mode,
+		irte.avail, irte.vector, irte.dest_id,
+		irte.sid, irte.sq, irte.svt);
+
+	memset(entry, 0, sizeof(*entry));
+
+	entry->index2	= (index >> 15) & 0x1;
+	entry->zero	= 0;
+	entry->format	= 1;
+	entry->index	= (index & 0x7fff);
+	/*
+	 * IO-APIC RTE will be configured with virtual vector.
+	 * irq handler will do the explicit EOI to the io-apic.
+	 */
+	entry->vector	= attr->ioapic_pin;
+	entry->mask	= 0;			/* enable IRQ */
+	entry->trigger	= attr->trigger;
+	entry->polarity	= attr->polarity;
+
+	/* Mask level triggered irqs.
+	 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
+	 */
+	if (attr->trigger)
+		entry->mask = 1;
+
+	return 0;
+}
+
+static int setup_ioapic_entry(int irq, struct IO_APIC_route_entry *entry,
+			       unsigned int destination, int vector,
+			       struct io_apic_irq_attr *attr)
+{
+	if (intr_remapping_enabled)
+		return setup_ir_ioapic_entry(irq,
+			 (struct IR_IO_APIC_route_entry *)entry,
+			 destination, vector, attr);
+
+	memset(entry, 0, sizeof(*entry));
+
+	entry->delivery_mode = apic->irq_delivery_mode;
+	entry->dest_mode     = apic->irq_dest_mode;
+	entry->dest	     = destination;
+	entry->vector	     = vector;
+	entry->mask	     = 0;			/* enable IRQ */
+	entry->trigger	     = attr->trigger;
+	entry->polarity	     = attr->polarity;
+
+	/*
+	 * Mask level triggered irqs.
+	 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
+	 */
+	if (attr->trigger)
+		entry->mask = 1;
+
+	return 0;
+}
+
+static void setup_ioapic_irq(unsigned int irq, struct irq_cfg *cfg,
+				struct io_apic_irq_attr *attr)
+{
+	struct IO_APIC_route_entry entry;
+	unsigned int dest;
+
+	if (!IO_APIC_IRQ(irq))
+		return;
+	/*
+	 * For legacy irqs, cfg->domain starts with cpu 0 for legacy
+	 * controllers like 8259. Now that IO-APIC can handle this irq, update
+	 * the cfg->domain.
+	 */
+	if (irq < legacy_pic->nr_legacy_irqs && cpumask_test_cpu(0, cfg->domain))
+		apic->vector_allocation_domain(0, cfg->domain);
+
+	if (assign_irq_vector(irq, cfg, apic->target_cpus()))
+		return;
+
+	dest = apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus());
+
+	apic_printk(APIC_VERBOSE,KERN_DEBUG
+		    "IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
+		    "IRQ %d Mode:%i Active:%i Dest:%d)\n",
+		    attr->ioapic, mpc_ioapic_id(attr->ioapic), attr->ioapic_pin,
+		    cfg->vector, irq, attr->trigger, attr->polarity, dest);
+
+	if (setup_ioapic_entry(irq, &entry, dest, cfg->vector, attr)) {
+		pr_warn("Failed to setup ioapic entry for ioapic  %d, pin %d\n",
+			mpc_ioapic_id(attr->ioapic), attr->ioapic_pin);
+		__clear_irq_vector(irq, cfg);
+
+		return;
+	}
+
+	ioapic_register_intr(irq, cfg, attr->trigger);
+	if (irq < legacy_pic->nr_legacy_irqs)
+		legacy_pic->mask(irq);
+
+	ioapic_write_entry(attr->ioapic, attr->ioapic_pin, entry);
+}
+
+static bool __init io_apic_pin_not_connected(int idx, int ioapic_idx, int pin)
+{
+	if (idx != -1)
+		return false;
+
+	apic_printk(APIC_VERBOSE, KERN_DEBUG " apic %d pin %d not connected\n",
+		    mpc_ioapic_id(ioapic_idx), pin);
+	return true;
+}
+
+static void __init __io_apic_setup_irqs(unsigned int ioapic_idx)
+{
+	int idx, node = cpu_to_node(0);
+	struct io_apic_irq_attr attr;
+	unsigned int pin, irq;
+
+	for (pin = 0; pin < ioapics[ioapic_idx].nr_registers; pin++) {
+		idx = find_irq_entry(ioapic_idx, pin, mp_INT);
+		if (io_apic_pin_not_connected(idx, ioapic_idx, pin))
+			continue;
+
+		irq = pin_2_irq(idx, ioapic_idx, pin);
+
+		if ((ioapic_idx > 0) && (irq > 16))
+			continue;
+
+		/*
+		 * Skip the timer IRQ if there's a quirk handler
+		 * installed and if it returns 1:
+		 */
+		if (apic->multi_timer_check &&
+		    apic->multi_timer_check(ioapic_idx, irq))
+			continue;
+
+		set_io_apic_irq_attr(&attr, ioapic_idx, pin, irq_trigger(idx),
+				     irq_polarity(idx));
+
+		io_apic_setup_irq_pin(irq, node, &attr);
+	}
+}
+
+static void __init setup_IO_APIC_irqs(void)
+{
+	unsigned int ioapic_idx;
+
+	apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
+
+	for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++)
+		__io_apic_setup_irqs(ioapic_idx);
+}
+
+/*
+ * for the gsit that is not in first ioapic
+ * but could not use acpi_register_gsi()
+ * like some special sci in IBM x3330
+ */
+void setup_IO_APIC_irq_extra(u32 gsi)
+{
+	int ioapic_idx = 0, pin, idx, irq, node = cpu_to_node(0);
+	struct io_apic_irq_attr attr;
+
+	/*
+	 * Convert 'gsi' to 'ioapic.pin'.
+	 */
+	ioapic_idx = mp_find_ioapic(gsi);
+	if (ioapic_idx < 0)
+		return;
+
+	pin = mp_find_ioapic_pin(ioapic_idx, gsi);
+	idx = find_irq_entry(ioapic_idx, pin, mp_INT);
+	if (idx == -1)
+		return;
+
+	irq = pin_2_irq(idx, ioapic_idx, pin);
+
+	/* Only handle the non legacy irqs on secondary ioapics */
+	if (ioapic_idx == 0 || irq < NR_IRQS_LEGACY)
+		return;
+
+	set_io_apic_irq_attr(&attr, ioapic_idx, pin, irq_trigger(idx),
+			     irq_polarity(idx));
+
+	io_apic_setup_irq_pin_once(irq, node, &attr);
+}
+
+/*
+ * Set up the timer pin, possibly with the 8259A-master behind.
+ */
+static void __init setup_timer_IRQ0_pin(unsigned int ioapic_idx,
+					 unsigned int pin, int vector)
+{
+	struct IO_APIC_route_entry entry;
+
+	if (intr_remapping_enabled)
+		return;
+
+	memset(&entry, 0, sizeof(entry));
+
+	/*
+	 * We use logical delivery to get the timer IRQ
+	 * to the first CPU.
+	 */
+	entry.dest_mode = apic->irq_dest_mode;
+	entry.mask = 0;			/* don't mask IRQ for edge */
+	entry.dest = apic->cpu_mask_to_apicid(apic->target_cpus());
+	entry.delivery_mode = apic->irq_delivery_mode;
+	entry.polarity = 0;
+	entry.trigger = 0;
+	entry.vector = vector;
+
+	/*
+	 * The timer IRQ doesn't have to know that behind the
+	 * scene we may have a 8259A-master in AEOI mode ...
+	 */
+	irq_set_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq,
+				      "edge");
+
+	/*
+	 * Add it to the IO-APIC irq-routing table:
+	 */
+	ioapic_write_entry(ioapic_idx, pin, entry);
+}
+
+__apicdebuginit(void) print_IO_APIC(int ioapic_idx)
+{
+	int i;
+	union IO_APIC_reg_00 reg_00;
+	union IO_APIC_reg_01 reg_01;
+	union IO_APIC_reg_02 reg_02;
+	union IO_APIC_reg_03 reg_03;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	reg_00.raw = io_apic_read(ioapic_idx, 0);
+	reg_01.raw = io_apic_read(ioapic_idx, 1);
+	if (reg_01.bits.version >= 0x10)
+		reg_02.raw = io_apic_read(ioapic_idx, 2);
+	if (reg_01.bits.version >= 0x20)
+		reg_03.raw = io_apic_read(ioapic_idx, 3);
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+
+	printk("\n");
+	printk(KERN_DEBUG "IO APIC #%d......\n", mpc_ioapic_id(ioapic_idx));
+	printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
+	printk(KERN_DEBUG ".......    : physical APIC id: %02X\n", reg_00.bits.ID);
+	printk(KERN_DEBUG ".......    : Delivery Type: %X\n", reg_00.bits.delivery_type);
+	printk(KERN_DEBUG ".......    : LTS          : %X\n", reg_00.bits.LTS);
+
+	printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)&reg_01);
+	printk(KERN_DEBUG ".......     : max redirection entries: %02X\n",
+		reg_01.bits.entries);
+
+	printk(KERN_DEBUG ".......     : PRQ implemented: %X\n", reg_01.bits.PRQ);
+	printk(KERN_DEBUG ".......     : IO APIC version: %02X\n",
+		reg_01.bits.version);
+
+	/*
+	 * Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
+	 * but the value of reg_02 is read as the previous read register
+	 * value, so ignore it if reg_02 == reg_01.
+	 */
+	if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
+		printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
+		printk(KERN_DEBUG ".......     : arbitration: %02X\n", reg_02.bits.arbitration);
+	}
+
+	/*
+	 * Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
+	 * or reg_03, but the value of reg_0[23] is read as the previous read
+	 * register value, so ignore it if reg_03 == reg_0[12].
+	 */
+	if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
+	    reg_03.raw != reg_01.raw) {
+		printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
+		printk(KERN_DEBUG ".......     : Boot DT    : %X\n", reg_03.bits.boot_DT);
+	}
+
+	printk(KERN_DEBUG ".... IRQ redirection table:\n");
+
+	if (intr_remapping_enabled) {
+		printk(KERN_DEBUG " NR Indx Fmt Mask Trig IRR"
+			" Pol Stat Indx2 Zero Vect:\n");
+	} else {
+		printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
+			" Stat Dmod Deli Vect:\n");
+	}
+
+	for (i = 0; i <= reg_01.bits.entries; i++) {
+		if (intr_remapping_enabled) {
+			struct IO_APIC_route_entry entry;
+			struct IR_IO_APIC_route_entry *ir_entry;
+
+			entry = ioapic_read_entry(ioapic_idx, i);
+			ir_entry = (struct IR_IO_APIC_route_entry *) &entry;
+			printk(KERN_DEBUG " %02x %04X ",
+				i,
+				ir_entry->index
+			);
+			printk("%1d   %1d    %1d    %1d   %1d   "
+				"%1d    %1d     %X    %02X\n",
+				ir_entry->format,
+				ir_entry->mask,
+				ir_entry->trigger,
+				ir_entry->irr,
+				ir_entry->polarity,
+				ir_entry->delivery_status,
+				ir_entry->index2,
+				ir_entry->zero,
+				ir_entry->vector
+			);
+		} else {
+			struct IO_APIC_route_entry entry;
+
+			entry = ioapic_read_entry(ioapic_idx, i);
+			printk(KERN_DEBUG " %02x %02X  ",
+				i,
+				entry.dest
+			);
+			printk("%1d    %1d    %1d   %1d   %1d    "
+				"%1d    %1d    %02X\n",
+				entry.mask,
+				entry.trigger,
+				entry.irr,
+				entry.polarity,
+				entry.delivery_status,
+				entry.dest_mode,
+				entry.delivery_mode,
+				entry.vector
+			);
+		}
+	}
+}
+
+__apicdebuginit(void) print_IO_APICs(void)
+{
+	int ioapic_idx;
+	struct irq_cfg *cfg;
+	unsigned int irq;
+	struct irq_chip *chip;
+
+	printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
+	for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++)
+		printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
+		       mpc_ioapic_id(ioapic_idx),
+		       ioapics[ioapic_idx].nr_registers);
+
+	/*
+	 * We are a bit conservative about what we expect.  We have to
+	 * know about every hardware change ASAP.
+	 */
+	printk(KERN_INFO "testing the IO APIC.......................\n");
+
+	for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++)
+		print_IO_APIC(ioapic_idx);
+
+	printk(KERN_DEBUG "IRQ to pin mappings:\n");
+	for_each_active_irq(irq) {
+		struct irq_pin_list *entry;
+
+		chip = irq_get_chip(irq);
+		if (chip != &ioapic_chip)
+			continue;
+
+		cfg = irq_get_chip_data(irq);
+		if (!cfg)
+			continue;
+		entry = cfg->irq_2_pin;
+		if (!entry)
+			continue;
+		printk(KERN_DEBUG "IRQ%d ", irq);
+		for_each_irq_pin(entry, cfg->irq_2_pin)
+			printk("-> %d:%d", entry->apic, entry->pin);
+		printk("\n");
+	}
+
+	printk(KERN_INFO ".................................... done.\n");
+}
+
+__apicdebuginit(void) print_APIC_field(int base)
+{
+	int i;
+
+	printk(KERN_DEBUG);
+
+	for (i = 0; i < 8; i++)
+		printk(KERN_CONT "%08x", apic_read(base + i*0x10));
+
+	printk(KERN_CONT "\n");
+}
+
+__apicdebuginit(void) print_local_APIC(void *dummy)
+{
+	unsigned int i, v, ver, maxlvt;
+	u64 icr;
+
+	printk(KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
+		smp_processor_id(), hard_smp_processor_id());
+	v = apic_read(APIC_ID);
+	printk(KERN_INFO "... APIC ID:      %08x (%01x)\n", v, read_apic_id());
+	v = apic_read(APIC_LVR);
+	printk(KERN_INFO "... APIC VERSION: %08x\n", v);
+	ver = GET_APIC_VERSION(v);
+	maxlvt = lapic_get_maxlvt();
+
+	v = apic_read(APIC_TASKPRI);
+	printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
+
+	if (APIC_INTEGRATED(ver)) {                     /* !82489DX */
+		if (!APIC_XAPIC(ver)) {
+			v = apic_read(APIC_ARBPRI);
+			printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
+			       v & APIC_ARBPRI_MASK);
+		}
+		v = apic_read(APIC_PROCPRI);
+		printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
+	}
+
+	/*
+	 * Remote read supported only in the 82489DX and local APIC for
+	 * Pentium processors.
+	 */
+	if (!APIC_INTEGRATED(ver) || maxlvt == 3) {
+		v = apic_read(APIC_RRR);
+		printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
+	}
+
+	v = apic_read(APIC_LDR);
+	printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
+	if (!x2apic_enabled()) {
+		v = apic_read(APIC_DFR);
+		printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
+	}
+	v = apic_read(APIC_SPIV);
+	printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
+
+	printk(KERN_DEBUG "... APIC ISR field:\n");
+	print_APIC_field(APIC_ISR);
+	printk(KERN_DEBUG "... APIC TMR field:\n");
+	print_APIC_field(APIC_TMR);
+	printk(KERN_DEBUG "... APIC IRR field:\n");
+	print_APIC_field(APIC_IRR);
+
+	if (APIC_INTEGRATED(ver)) {             /* !82489DX */
+		if (maxlvt > 3)         /* Due to the Pentium erratum 3AP. */
+			apic_write(APIC_ESR, 0);
+
+		v = apic_read(APIC_ESR);
+		printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
+	}
+
+	icr = apic_icr_read();
+	printk(KERN_DEBUG "... APIC ICR: %08x\n", (u32)icr);
+	printk(KERN_DEBUG "... APIC ICR2: %08x\n", (u32)(icr >> 32));
+
+	v = apic_read(APIC_LVTT);
+	printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
+
+	if (maxlvt > 3) {                       /* PC is LVT#4. */
+		v = apic_read(APIC_LVTPC);
+		printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
+	}
+	v = apic_read(APIC_LVT0);
+	printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
+	v = apic_read(APIC_LVT1);
+	printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
+
+	if (maxlvt > 2) {			/* ERR is LVT#3. */
+		v = apic_read(APIC_LVTERR);
+		printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
+	}
+
+	v = apic_read(APIC_TMICT);
+	printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
+	v = apic_read(APIC_TMCCT);
+	printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
+	v = apic_read(APIC_TDCR);
+	printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
+
+	if (boot_cpu_has(X86_FEATURE_EXTAPIC)) {
+		v = apic_read(APIC_EFEAT);
+		maxlvt = (v >> 16) & 0xff;
+		printk(KERN_DEBUG "... APIC EFEAT: %08x\n", v);
+		v = apic_read(APIC_ECTRL);
+		printk(KERN_DEBUG "... APIC ECTRL: %08x\n", v);
+		for (i = 0; i < maxlvt; i++) {
+			v = apic_read(APIC_EILVTn(i));
+			printk(KERN_DEBUG "... APIC EILVT%d: %08x\n", i, v);
+		}
+	}
+	printk("\n");
+}
+
+__apicdebuginit(void) print_local_APICs(int maxcpu)
+{
+	int cpu;
+
+	if (!maxcpu)
+		return;
+
+	preempt_disable();
+	for_each_online_cpu(cpu) {
+		if (cpu >= maxcpu)
+			break;
+		smp_call_function_single(cpu, print_local_APIC, NULL, 1);
+	}
+	preempt_enable();
+}
+
+__apicdebuginit(void) print_PIC(void)
+{
+	unsigned int v;
+	unsigned long flags;
+
+	if (!legacy_pic->nr_legacy_irqs)
+		return;
+
+	printk(KERN_DEBUG "\nprinting PIC contents\n");
+
+	raw_spin_lock_irqsave(&i8259A_lock, flags);
+
+	v = inb(0xa1) << 8 | inb(0x21);
+	printk(KERN_DEBUG "... PIC  IMR: %04x\n", v);
+
+	v = inb(0xa0) << 8 | inb(0x20);
+	printk(KERN_DEBUG "... PIC  IRR: %04x\n", v);
+
+	outb(0x0b,0xa0);
+	outb(0x0b,0x20);
+	v = inb(0xa0) << 8 | inb(0x20);
+	outb(0x0a,0xa0);
+	outb(0x0a,0x20);
+
+	raw_spin_unlock_irqrestore(&i8259A_lock, flags);
+
+	printk(KERN_DEBUG "... PIC  ISR: %04x\n", v);
+
+	v = inb(0x4d1) << 8 | inb(0x4d0);
+	printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
+}
+
+static int __initdata show_lapic = 1;
+static __init int setup_show_lapic(char *arg)
+{
+	int num = -1;
+
+	if (strcmp(arg, "all") == 0) {
+		show_lapic = CONFIG_NR_CPUS;
+	} else {
+		get_option(&arg, &num);
+		if (num >= 0)
+			show_lapic = num;
+	}
+
+	return 1;
+}
+__setup("show_lapic=", setup_show_lapic);
+
+__apicdebuginit(int) print_ICs(void)
+{
+	if (apic_verbosity == APIC_QUIET)
+		return 0;
+
+	print_PIC();
+
+	/* don't print out if apic is not there */
+	if (!cpu_has_apic && !apic_from_smp_config())
+		return 0;
+
+	print_local_APICs(show_lapic);
+	print_IO_APICs();
+
+	return 0;
+}
+
+late_initcall(print_ICs);
+
+
+/* Where if anywhere is the i8259 connect in external int mode */
+static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
+
+void __init enable_IO_APIC(void)
+{
+	int i8259_apic, i8259_pin;
+	int apic;
+
+	if (!legacy_pic->nr_legacy_irqs)
+		return;
+
+	for(apic = 0; apic < nr_ioapics; apic++) {
+		int pin;
+		/* See if any of the pins is in ExtINT mode */
+		for (pin = 0; pin < ioapics[apic].nr_registers; pin++) {
+			struct IO_APIC_route_entry entry;
+			entry = ioapic_read_entry(apic, pin);
+
+			/* If the interrupt line is enabled and in ExtInt mode
+			 * I have found the pin where the i8259 is connected.
+			 */
+			if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
+				ioapic_i8259.apic = apic;
+				ioapic_i8259.pin  = pin;
+				goto found_i8259;
+			}
+		}
+	}
+ found_i8259:
+	/* Look to see what if the MP table has reported the ExtINT */
+	/* If we could not find the appropriate pin by looking at the ioapic
+	 * the i8259 probably is not connected the ioapic but give the
+	 * mptable a chance anyway.
+	 */
+	i8259_pin  = find_isa_irq_pin(0, mp_ExtINT);
+	i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
+	/* Trust the MP table if nothing is setup in the hardware */
+	if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
+		printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
+		ioapic_i8259.pin  = i8259_pin;
+		ioapic_i8259.apic = i8259_apic;
+	}
+	/* Complain if the MP table and the hardware disagree */
+	if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
+		(i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
+	{
+		printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
+	}
+
+	/*
+	 * Do not trust the IO-APIC being empty at bootup
+	 */
+	clear_IO_APIC();
+}
+
+/*
+ * Not an __init, needed by the reboot code
+ */
+void disable_IO_APIC(void)
+{
+	/*
+	 * Clear the IO-APIC before rebooting:
+	 */
+	clear_IO_APIC();
+
+	if (!legacy_pic->nr_legacy_irqs)
+		return;
+
+	/*
+	 * If the i8259 is routed through an IOAPIC
+	 * Put that IOAPIC in virtual wire mode
+	 * so legacy interrupts can be delivered.
+	 *
+	 * With interrupt-remapping, for now we will use virtual wire A mode,
+	 * as virtual wire B is little complex (need to configure both
+	 * IOAPIC RTE as well as interrupt-remapping table entry).
+	 * As this gets called during crash dump, keep this simple for now.
+	 */
+	if (ioapic_i8259.pin != -1 && !intr_remapping_enabled) {
+		struct IO_APIC_route_entry entry;
+
+		memset(&entry, 0, sizeof(entry));
+		entry.mask            = 0; /* Enabled */
+		entry.trigger         = 0; /* Edge */
+		entry.irr             = 0;
+		entry.polarity        = 0; /* High */
+		entry.delivery_status = 0;
+		entry.dest_mode       = 0; /* Physical */
+		entry.delivery_mode   = dest_ExtINT; /* ExtInt */
+		entry.vector          = 0;
+		entry.dest            = read_apic_id();
+
+		/*
+		 * Add it to the IO-APIC irq-routing table:
+		 */
+		ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
+	}
+
+	/*
+	 * Use virtual wire A mode when interrupt remapping is enabled.
+	 */
+	if (cpu_has_apic || apic_from_smp_config())
+		disconnect_bsp_APIC(!intr_remapping_enabled &&
+				ioapic_i8259.pin != -1);
+}
+
+#ifdef CONFIG_X86_32
+/*
+ * function to set the IO-APIC physical IDs based on the
+ * values stored in the MPC table.
+ *
+ * by Matt Domsch <Matt_Domsch@dell.com>  Tue Dec 21 12:25:05 CST 1999
+ */
+void __init setup_ioapic_ids_from_mpc_nocheck(void)
+{
+	union IO_APIC_reg_00 reg_00;
+	physid_mask_t phys_id_present_map;
+	int ioapic_idx;
+	int i;
+	unsigned char old_id;
+	unsigned long flags;
+
+	/*
+	 * This is broken; anything with a real cpu count has to
+	 * circumvent this idiocy regardless.
+	 */
+	apic->ioapic_phys_id_map(&phys_cpu_present_map, &phys_id_present_map);
+
+	/*
+	 * Set the IOAPIC ID to the value stored in the MPC table.
+	 */
+	for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) {
+		/* Read the register 0 value */
+		raw_spin_lock_irqsave(&ioapic_lock, flags);
+		reg_00.raw = io_apic_read(ioapic_idx, 0);
+		raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+
+		old_id = mpc_ioapic_id(ioapic_idx);
+
+		if (mpc_ioapic_id(ioapic_idx) >= get_physical_broadcast()) {
+			printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
+				ioapic_idx, mpc_ioapic_id(ioapic_idx));
+			printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
+				reg_00.bits.ID);
+			ioapics[ioapic_idx].mp_config.apicid = reg_00.bits.ID;
+		}
+
+		/*
+		 * Sanity check, is the ID really free? Every APIC in a
+		 * system must have a unique ID or we get lots of nice
+		 * 'stuck on smp_invalidate_needed IPI wait' messages.
+		 */
+		if (apic->check_apicid_used(&phys_id_present_map,
+					    mpc_ioapic_id(ioapic_idx))) {
+			printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
+				ioapic_idx, mpc_ioapic_id(ioapic_idx));
+			for (i = 0; i < get_physical_broadcast(); i++)
+				if (!physid_isset(i, phys_id_present_map))
+					break;
+			if (i >= get_physical_broadcast())
+				panic("Max APIC ID exceeded!\n");
+			printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
+				i);
+			physid_set(i, phys_id_present_map);
+			ioapics[ioapic_idx].mp_config.apicid = i;
+		} else {
+			physid_mask_t tmp;
+			apic->apicid_to_cpu_present(mpc_ioapic_id(ioapic_idx),
+						    &tmp);
+			apic_printk(APIC_VERBOSE, "Setting %d in the "
+					"phys_id_present_map\n",
+					mpc_ioapic_id(ioapic_idx));
+			physids_or(phys_id_present_map, phys_id_present_map, tmp);
+		}
+
+		/*
+		 * We need to adjust the IRQ routing table
+		 * if the ID changed.
+		 */
+		if (old_id != mpc_ioapic_id(ioapic_idx))
+			for (i = 0; i < mp_irq_entries; i++)
+				if (mp_irqs[i].dstapic == old_id)
+					mp_irqs[i].dstapic
+						= mpc_ioapic_id(ioapic_idx);
+
+		/*
+		 * Update the ID register according to the right value
+		 * from the MPC table if they are different.
+		 */
+		if (mpc_ioapic_id(ioapic_idx) == reg_00.bits.ID)
+			continue;
+
+		apic_printk(APIC_VERBOSE, KERN_INFO
+			"...changing IO-APIC physical APIC ID to %d ...",
+			mpc_ioapic_id(ioapic_idx));
+
+		reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
+		raw_spin_lock_irqsave(&ioapic_lock, flags);
+		io_apic_write(ioapic_idx, 0, reg_00.raw);
+		raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+
+		/*
+		 * Sanity check
+		 */
+		raw_spin_lock_irqsave(&ioapic_lock, flags);
+		reg_00.raw = io_apic_read(ioapic_idx, 0);
+		raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+		if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx))
+			printk("could not set ID!\n");
+		else
+			apic_printk(APIC_VERBOSE, " ok.\n");
+	}
+}
+
+void __init setup_ioapic_ids_from_mpc(void)
+{
+
+	if (acpi_ioapic)
+		return;
+	/*
+	 * Don't check I/O APIC IDs for xAPIC systems.  They have
+	 * no meaning without the serial APIC bus.
+	 */
+	if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+		|| APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
+		return;
+	setup_ioapic_ids_from_mpc_nocheck();
+}
+#endif
+
+int no_timer_check __initdata;
+
+static int __init notimercheck(char *s)
+{
+	no_timer_check = 1;
+	return 1;
+}
+__setup("no_timer_check", notimercheck);
+
+/*
+ * There is a nasty bug in some older SMP boards, their mptable lies
+ * about the timer IRQ. We do the following to work around the situation:
+ *
+ *	- timer IRQ defaults to IO-APIC IRQ
+ *	- if this function detects that timer IRQs are defunct, then we fall
+ *	  back to ISA timer IRQs
+ */
+static int __init timer_irq_works(void)
+{
+	unsigned long t1 = jiffies;
+	unsigned long flags;
+
+	if (no_timer_check)
+		return 1;
+
+	local_save_flags(flags);
+	local_irq_enable();
+	/* Let ten ticks pass... */
+	mdelay((10 * 1000) / HZ);
+	local_irq_restore(flags);
+
+	/*
+	 * Expect a few ticks at least, to be sure some possible
+	 * glue logic does not lock up after one or two first
+	 * ticks in a non-ExtINT mode.  Also the local APIC
+	 * might have cached one ExtINT interrupt.  Finally, at
+	 * least one tick may be lost due to delays.
+	 */
+
+	/* jiffies wrap? */
+	if (time_after(jiffies, t1 + 4))
+		return 1;
+	return 0;
+}
+
+/*
+ * In the SMP+IOAPIC case it might happen that there are an unspecified
+ * number of pending IRQ events unhandled. These cases are very rare,
+ * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
+ * better to do it this way as thus we do not have to be aware of
+ * 'pending' interrupts in the IRQ path, except at this point.
+ */
+/*
+ * Edge triggered needs to resend any interrupt
+ * that was delayed but this is now handled in the device
+ * independent code.
+ */
+
+/*
+ * Starting up a edge-triggered IO-APIC interrupt is
+ * nasty - we need to make sure that we get the edge.
+ * If it is already asserted for some reason, we need
+ * return 1 to indicate that is was pending.
+ *
+ * This is not complete - we should be able to fake
+ * an edge even if it isn't on the 8259A...
+ */
+
+static unsigned int startup_ioapic_irq(struct irq_data *data)
+{
+	int was_pending = 0, irq = data->irq;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	if (irq < legacy_pic->nr_legacy_irqs) {
+		legacy_pic->mask(irq);
+		if (legacy_pic->irq_pending(irq))
+			was_pending = 1;
+	}
+	__unmask_ioapic(data->chip_data);
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+
+	return was_pending;
+}
+
+static int ioapic_retrigger_irq(struct irq_data *data)
+{
+	struct irq_cfg *cfg = data->chip_data;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&vector_lock, flags);
+	apic->send_IPI_mask(cpumask_of(cpumask_first(cfg->domain)), cfg->vector);
+	raw_spin_unlock_irqrestore(&vector_lock, flags);
+
+	return 1;
+}
+
+/*
+ * Level and edge triggered IO-APIC interrupts need different handling,
+ * so we use two separate IRQ descriptors. Edge triggered IRQs can be
+ * handled with the level-triggered descriptor, but that one has slightly
+ * more overhead. Level-triggered interrupts cannot be handled with the
+ * edge-triggered handler, without risking IRQ storms and other ugly
+ * races.
+ */
+
+#ifdef CONFIG_SMP
+void send_cleanup_vector(struct irq_cfg *cfg)
+{
+	cpumask_var_t cleanup_mask;
+
+	if (unlikely(!alloc_cpumask_var(&cleanup_mask, GFP_ATOMIC))) {
+		unsigned int i;
+		for_each_cpu_and(i, cfg->old_domain, cpu_online_mask)
+			apic->send_IPI_mask(cpumask_of(i), IRQ_MOVE_CLEANUP_VECTOR);
+	} else {
+		cpumask_and(cleanup_mask, cfg->old_domain, cpu_online_mask);
+		apic->send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
+		free_cpumask_var(cleanup_mask);
+	}
+	cfg->move_in_progress = 0;
+}
+
+static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, struct irq_cfg *cfg)
+{
+	int apic, pin;
+	struct irq_pin_list *entry;
+	u8 vector = cfg->vector;
+
+	for_each_irq_pin(entry, cfg->irq_2_pin) {
+		unsigned int reg;
+
+		apic = entry->apic;
+		pin = entry->pin;
+		/*
+		 * With interrupt-remapping, destination information comes
+		 * from interrupt-remapping table entry.
+		 */
+		if (!irq_remapped(cfg))
+			io_apic_write(apic, 0x11 + pin*2, dest);
+		reg = io_apic_read(apic, 0x10 + pin*2);
+		reg &= ~IO_APIC_REDIR_VECTOR_MASK;
+		reg |= vector;
+		io_apic_modify(apic, 0x10 + pin*2, reg);
+	}
+}
+
+/*
+ * Either sets data->affinity to a valid value, and returns
+ * ->cpu_mask_to_apicid of that in dest_id, or returns -1 and
+ * leaves data->affinity untouched.
+ */
+int __ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
+			  unsigned int *dest_id)
+{
+	struct irq_cfg *cfg = data->chip_data;
+
+	if (!cpumask_intersects(mask, cpu_online_mask))
+		return -1;
+
+	if (assign_irq_vector(data->irq, data->chip_data, mask))
+		return -1;
+
+	cpumask_copy(data->affinity, mask);
+
+	*dest_id = apic->cpu_mask_to_apicid_and(mask, cfg->domain);
+	return 0;
+}
+
+static int
+ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
+		    bool force)
+{
+	unsigned int dest, irq = data->irq;
+	unsigned long flags;
+	int ret;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	ret = __ioapic_set_affinity(data, mask, &dest);
+	if (!ret) {
+		/* Only the high 8 bits are valid. */
+		dest = SET_APIC_LOGICAL_ID(dest);
+		__target_IO_APIC_irq(irq, dest, data->chip_data);
+	}
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+	return ret;
+}
+
+#ifdef CONFIG_IRQ_REMAP
+
+/*
+ * Migrate the IO-APIC irq in the presence of intr-remapping.
+ *
+ * For both level and edge triggered, irq migration is a simple atomic
+ * update(of vector and cpu destination) of IRTE and flush the hardware cache.
+ *
+ * For level triggered, we eliminate the io-apic RTE modification (with the
+ * updated vector information), by using a virtual vector (io-apic pin number).
+ * Real vector that is used for interrupting cpu will be coming from
+ * the interrupt-remapping table entry.
+ *
+ * As the migration is a simple atomic update of IRTE, the same mechanism
+ * is used to migrate MSI irq's in the presence of interrupt-remapping.
+ */
+static int
+ir_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
+		       bool force)
+{
+	struct irq_cfg *cfg = data->chip_data;
+	unsigned int dest, irq = data->irq;
+	struct irte irte;
+
+	if (!cpumask_intersects(mask, cpu_online_mask))
+		return -EINVAL;
+
+	if (get_irte(irq, &irte))
+		return -EBUSY;
+
+	if (assign_irq_vector(irq, cfg, mask))
+		return -EBUSY;
+
+	dest = apic->cpu_mask_to_apicid_and(cfg->domain, mask);
+
+	irte.vector = cfg->vector;
+	irte.dest_id = IRTE_DEST(dest);
+
+	/*
+	 * Atomically updates the IRTE with the new destination, vector
+	 * and flushes the interrupt entry cache.
+	 */
+	modify_irte(irq, &irte);
+
+	/*
+	 * After this point, all the interrupts will start arriving
+	 * at the new destination. So, time to cleanup the previous
+	 * vector allocation.
+	 */
+	if (cfg->move_in_progress)
+		send_cleanup_vector(cfg);
+
+	cpumask_copy(data->affinity, mask);
+	return 0;
+}
+
+#else
+static inline int
+ir_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
+		       bool force)
+{
+	return 0;
+}
+#endif
+
+asmlinkage void smp_irq_move_cleanup_interrupt(void)
+{
+	unsigned vector, me;
+
+	ack_APIC_irq();
+	irq_enter();
+	exit_idle();
+
+	me = smp_processor_id();
+	for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
+		unsigned int irq;
+		unsigned int irr;
+		struct irq_desc *desc;
+		struct irq_cfg *cfg;
+		irq = __this_cpu_read(vector_irq[vector]);
+
+		if (irq == -1)
+			continue;
+
+		desc = irq_to_desc(irq);
+		if (!desc)
+			continue;
+
+		cfg = irq_cfg(irq);
+		raw_spin_lock(&desc->lock);
+
+		/*
+		 * Check if the irq migration is in progress. If so, we
+		 * haven't received the cleanup request yet for this irq.
+		 */
+		if (cfg->move_in_progress)
+			goto unlock;
+
+		if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain))
+			goto unlock;
+
+		irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
+		/*
+		 * Check if the vector that needs to be cleanedup is
+		 * registered at the cpu's IRR. If so, then this is not
+		 * the best time to clean it up. Lets clean it up in the
+		 * next attempt by sending another IRQ_MOVE_CLEANUP_VECTOR
+		 * to myself.
+		 */
+		if (irr  & (1 << (vector % 32))) {
+			apic->send_IPI_self(IRQ_MOVE_CLEANUP_VECTOR);
+			goto unlock;
+		}
+		__this_cpu_write(vector_irq[vector], -1);
+unlock:
+		raw_spin_unlock(&desc->lock);
+	}
+
+	irq_exit();
+}
+
+static void __irq_complete_move(struct irq_cfg *cfg, unsigned vector)
+{
+	unsigned me;
+
+	if (likely(!cfg->move_in_progress))
+		return;
+
+	me = smp_processor_id();
+
+	if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain))
+		send_cleanup_vector(cfg);
+}
+
+static void irq_complete_move(struct irq_cfg *cfg)
+{
+	__irq_complete_move(cfg, ~get_irq_regs()->orig_ax);
+}
+
+void irq_force_complete_move(int irq)
+{
+	struct irq_cfg *cfg = irq_get_chip_data(irq);
+
+	if (!cfg)
+		return;
+
+	__irq_complete_move(cfg, cfg->vector);
+}
+#else
+static inline void irq_complete_move(struct irq_cfg *cfg) { }
+#endif
+
+static void ack_apic_edge(struct irq_data *data)
+{
+	irq_complete_move(data->chip_data);
+	irq_move_irq(data);
+	ack_APIC_irq();
+}
+
+atomic_t irq_mis_count;
+
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+static inline bool ioapic_irqd_mask(struct irq_data *data, struct irq_cfg *cfg)
+{
+	/* If we are moving the irq we need to mask it */
+	if (unlikely(irqd_is_setaffinity_pending(data))) {
+		mask_ioapic(cfg);
+		return true;
+	}
+	return false;
+}
+
+static inline void ioapic_irqd_unmask(struct irq_data *data,
+				      struct irq_cfg *cfg, bool masked)
+{
+	if (unlikely(masked)) {
+		/* Only migrate the irq if the ack has been received.
+		 *
+		 * On rare occasions the broadcast level triggered ack gets
+		 * delayed going to ioapics, and if we reprogram the
+		 * vector while Remote IRR is still set the irq will never
+		 * fire again.
+		 *
+		 * To prevent this scenario we read the Remote IRR bit
+		 * of the ioapic.  This has two effects.
+		 * - On any sane system the read of the ioapic will
+		 *   flush writes (and acks) going to the ioapic from
+		 *   this cpu.
+		 * - We get to see if the ACK has actually been delivered.
+		 *
+		 * Based on failed experiments of reprogramming the
+		 * ioapic entry from outside of irq context starting
+		 * with masking the ioapic entry and then polling until
+		 * Remote IRR was clear before reprogramming the
+		 * ioapic I don't trust the Remote IRR bit to be
+		 * completey accurate.
+		 *
+		 * However there appears to be no other way to plug
+		 * this race, so if the Remote IRR bit is not
+		 * accurate and is causing problems then it is a hardware bug
+		 * and you can go talk to the chipset vendor about it.
+		 */
+		if (!io_apic_level_ack_pending(cfg))
+			irq_move_masked_irq(data);
+		unmask_ioapic(cfg);
+	}
+}
+#else
+static inline bool ioapic_irqd_mask(struct irq_data *data, struct irq_cfg *cfg)
+{
+	return false;
+}
+static inline void ioapic_irqd_unmask(struct irq_data *data,
+				      struct irq_cfg *cfg, bool masked)
+{
+}
+#endif
+
+static void ack_apic_level(struct irq_data *data)
+{
+	struct irq_cfg *cfg = data->chip_data;
+	int i, irq = data->irq;
+	unsigned long v;
+	bool masked;
+
+	irq_complete_move(cfg);
+	masked = ioapic_irqd_mask(data, cfg);
+
+	/*
+	 * It appears there is an erratum which affects at least version 0x11
+	 * of I/O APIC (that's the 82093AA and cores integrated into various
+	 * chipsets).  Under certain conditions a level-triggered interrupt is
+	 * erroneously delivered as edge-triggered one but the respective IRR
+	 * bit gets set nevertheless.  As a result the I/O unit expects an EOI
+	 * message but it will never arrive and further interrupts are blocked
+	 * from the source.  The exact reason is so far unknown, but the
+	 * phenomenon was observed when two consecutive interrupt requests
+	 * from a given source get delivered to the same CPU and the source is
+	 * temporarily disabled in between.
+	 *
+	 * A workaround is to simulate an EOI message manually.  We achieve it
+	 * by setting the trigger mode to edge and then to level when the edge
+	 * trigger mode gets detected in the TMR of a local APIC for a
+	 * level-triggered interrupt.  We mask the source for the time of the
+	 * operation to prevent an edge-triggered interrupt escaping meanwhile.
+	 * The idea is from Manfred Spraul.  --macro
+	 *
+	 * Also in the case when cpu goes offline, fixup_irqs() will forward
+	 * any unhandled interrupt on the offlined cpu to the new cpu
+	 * destination that is handling the corresponding interrupt. This
+	 * interrupt forwarding is done via IPI's. Hence, in this case also
+	 * level-triggered io-apic interrupt will be seen as an edge
+	 * interrupt in the IRR. And we can't rely on the cpu's EOI
+	 * to be broadcasted to the IO-APIC's which will clear the remoteIRR
+	 * corresponding to the level-triggered interrupt. Hence on IO-APIC's
+	 * supporting EOI register, we do an explicit EOI to clear the
+	 * remote IRR and on IO-APIC's which don't have an EOI register,
+	 * we use the above logic (mask+edge followed by unmask+level) from
+	 * Manfred Spraul to clear the remote IRR.
+	 */
+	i = cfg->vector;
+	v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
+
+	/*
+	 * We must acknowledge the irq before we move it or the acknowledge will
+	 * not propagate properly.
+	 */
+	ack_APIC_irq();
+
+	/*
+	 * Tail end of clearing remote IRR bit (either by delivering the EOI
+	 * message via io-apic EOI register write or simulating it using
+	 * mask+edge followed by unnask+level logic) manually when the
+	 * level triggered interrupt is seen as the edge triggered interrupt
+	 * at the cpu.
+	 */
+	if (!(v & (1 << (i & 0x1f)))) {
+		atomic_inc(&irq_mis_count);
+
+		eoi_ioapic_irq(irq, cfg);
+	}
+
+	ioapic_irqd_unmask(data, cfg, masked);
+}
+
+#ifdef CONFIG_IRQ_REMAP
+static void ir_ack_apic_edge(struct irq_data *data)
+{
+	ack_APIC_irq();
+}
+
+static void ir_ack_apic_level(struct irq_data *data)
+{
+	ack_APIC_irq();
+	eoi_ioapic_irq(data->irq, data->chip_data);
+}
+
+static void ir_print_prefix(struct irq_data *data, struct seq_file *p)
+{
+	seq_printf(p, " IR-%s", data->chip->name);
+}
+
+static void irq_remap_modify_chip_defaults(struct irq_chip *chip)
+{
+	chip->irq_print_chip = ir_print_prefix;
+	chip->irq_ack = ir_ack_apic_edge;
+	chip->irq_eoi = ir_ack_apic_level;
+
+#ifdef CONFIG_SMP
+	chip->irq_set_affinity = ir_ioapic_set_affinity;
+#endif
+}
+#endif /* CONFIG_IRQ_REMAP */
+
+static struct irq_chip ioapic_chip __read_mostly = {
+	.name			= "IO-APIC",
+	.irq_startup		= startup_ioapic_irq,
+	.irq_mask		= mask_ioapic_irq,
+	.irq_unmask		= unmask_ioapic_irq,
+	.irq_ack		= ack_apic_edge,
+	.irq_eoi		= ack_apic_level,
+#ifdef CONFIG_SMP
+	.irq_set_affinity	= ioapic_set_affinity,
+#endif
+	.irq_retrigger		= ioapic_retrigger_irq,
+};
+
+static inline void init_IO_APIC_traps(void)
+{
+	struct irq_cfg *cfg;
+	unsigned int irq;
+
+	/*
+	 * NOTE! The local APIC isn't very good at handling
+	 * multiple interrupts at the same interrupt level.
+	 * As the interrupt level is determined by taking the
+	 * vector number and shifting that right by 4, we
+	 * want to spread these out a bit so that they don't
+	 * all fall in the same interrupt level.
+	 *
+	 * Also, we've got to be careful not to trash gate
+	 * 0x80, because int 0x80 is hm, kind of importantish. ;)
+	 */
+	for_each_active_irq(irq) {
+		cfg = irq_get_chip_data(irq);
+		if (IO_APIC_IRQ(irq) && cfg && !cfg->vector) {
+			/*
+			 * Hmm.. We don't have an entry for this,
+			 * so default to an old-fashioned 8259
+			 * interrupt if we can..
+			 */
+			if (irq < legacy_pic->nr_legacy_irqs)
+				legacy_pic->make_irq(irq);
+			else
+				/* Strange. Oh, well.. */
+				irq_set_chip(irq, &no_irq_chip);
+		}
+	}
+}
+
+/*
+ * The local APIC irq-chip implementation:
+ */
+
+static void mask_lapic_irq(struct irq_data *data)
+{
+	unsigned long v;
+
+	v = apic_read(APIC_LVT0);
+	apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
+}
+
+static void unmask_lapic_irq(struct irq_data *data)
+{
+	unsigned long v;
+
+	v = apic_read(APIC_LVT0);
+	apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
+}
+
+static void ack_lapic_irq(struct irq_data *data)
+{
+	ack_APIC_irq();
+}
+
+static struct irq_chip lapic_chip __read_mostly = {
+	.name		= "local-APIC",
+	.irq_mask	= mask_lapic_irq,
+	.irq_unmask	= unmask_lapic_irq,
+	.irq_ack	= ack_lapic_irq,
+};
+
+static void lapic_register_intr(int irq)
+{
+	irq_clear_status_flags(irq, IRQ_LEVEL);
+	irq_set_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
+				      "edge");
+}
+
+/*
+ * This looks a bit hackish but it's about the only one way of sending
+ * a few INTA cycles to 8259As and any associated glue logic.  ICR does
+ * not support the ExtINT mode, unfortunately.  We need to send these
+ * cycles as some i82489DX-based boards have glue logic that keeps the
+ * 8259A interrupt line asserted until INTA.  --macro
+ */
+static inline void __init unlock_ExtINT_logic(void)
+{
+	int apic, pin, i;
+	struct IO_APIC_route_entry entry0, entry1;
+	unsigned char save_control, save_freq_select;
+
+	pin  = find_isa_irq_pin(8, mp_INT);
+	if (pin == -1) {
+		WARN_ON_ONCE(1);
+		return;
+	}
+	apic = find_isa_irq_apic(8, mp_INT);
+	if (apic == -1) {
+		WARN_ON_ONCE(1);
+		return;
+	}
+
+	entry0 = ioapic_read_entry(apic, pin);
+	clear_IO_APIC_pin(apic, pin);
+
+	memset(&entry1, 0, sizeof(entry1));
+
+	entry1.dest_mode = 0;			/* physical delivery */
+	entry1.mask = 0;			/* unmask IRQ now */
+	entry1.dest = hard_smp_processor_id();
+	entry1.delivery_mode = dest_ExtINT;
+	entry1.polarity = entry0.polarity;
+	entry1.trigger = 0;
+	entry1.vector = 0;
+
+	ioapic_write_entry(apic, pin, entry1);
+
+	save_control = CMOS_READ(RTC_CONTROL);
+	save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
+	CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
+		   RTC_FREQ_SELECT);
+	CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
+
+	i = 100;
+	while (i-- > 0) {
+		mdelay(10);
+		if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
+			i -= 10;
+	}
+
+	CMOS_WRITE(save_control, RTC_CONTROL);
+	CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
+	clear_IO_APIC_pin(apic, pin);
+
+	ioapic_write_entry(apic, pin, entry0);
+}
+
+static int disable_timer_pin_1 __initdata;
+/* Actually the next is obsolete, but keep it for paranoid reasons -AK */
+static int __init disable_timer_pin_setup(char *arg)
+{
+	disable_timer_pin_1 = 1;
+	return 0;
+}
+early_param("disable_timer_pin_1", disable_timer_pin_setup);
+
+int timer_through_8259 __initdata;
+
+/*
+ * This code may look a bit paranoid, but it's supposed to cooperate with
+ * a wide range of boards and BIOS bugs.  Fortunately only the timer IRQ
+ * is so screwy.  Thanks to Brian Perkins for testing/hacking this beast
+ * fanatically on his truly buggy board.
+ *
+ * FIXME: really need to revamp this for all platforms.
+ */
+static inline void __init check_timer(void)
+{
+	struct irq_cfg *cfg = irq_get_chip_data(0);
+	int node = cpu_to_node(0);
+	int apic1, pin1, apic2, pin2;
+	unsigned long flags;
+	int no_pin1 = 0;
+
+	local_irq_save(flags);
+
+	/*
+	 * get/set the timer IRQ vector:
+	 */
+	legacy_pic->mask(0);
+	assign_irq_vector(0, cfg, apic->target_cpus());
+
+	/*
+	 * As IRQ0 is to be enabled in the 8259A, the virtual
+	 * wire has to be disabled in the local APIC.  Also
+	 * timer interrupts need to be acknowledged manually in
+	 * the 8259A for the i82489DX when using the NMI
+	 * watchdog as that APIC treats NMIs as level-triggered.
+	 * The AEOI mode will finish them in the 8259A
+	 * automatically.
+	 */
+	apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
+	legacy_pic->init(1);
+
+	pin1  = find_isa_irq_pin(0, mp_INT);
+	apic1 = find_isa_irq_apic(0, mp_INT);
+	pin2  = ioapic_i8259.pin;
+	apic2 = ioapic_i8259.apic;
+
+	apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
+		    "apic1=%d pin1=%d apic2=%d pin2=%d\n",
+		    cfg->vector, apic1, pin1, apic2, pin2);
+
+	/*
+	 * Some BIOS writers are clueless and report the ExtINTA
+	 * I/O APIC input from the cascaded 8259A as the timer
+	 * interrupt input.  So just in case, if only one pin
+	 * was found above, try it both directly and through the
+	 * 8259A.
+	 */
+	if (pin1 == -1) {
+		if (intr_remapping_enabled)
+			panic("BIOS bug: timer not connected to IO-APIC");
+		pin1 = pin2;
+		apic1 = apic2;
+		no_pin1 = 1;
+	} else if (pin2 == -1) {
+		pin2 = pin1;
+		apic2 = apic1;
+	}
+
+	if (pin1 != -1) {
+		/*
+		 * Ok, does IRQ0 through the IOAPIC work?
+		 */
+		if (no_pin1) {
+			add_pin_to_irq_node(cfg, node, apic1, pin1);
+			setup_timer_IRQ0_pin(apic1, pin1, cfg->vector);
+		} else {
+			/* for edge trigger, setup_ioapic_irq already
+			 * leave it unmasked.
+			 * so only need to unmask if it is level-trigger
+			 * do we really have level trigger timer?
+			 */
+			int idx;
+			idx = find_irq_entry(apic1, pin1, mp_INT);
+			if (idx != -1 && irq_trigger(idx))
+				unmask_ioapic(cfg);
+		}
+		if (timer_irq_works()) {
+			if (disable_timer_pin_1 > 0)
+				clear_IO_APIC_pin(0, pin1);
+			goto out;
+		}
+		if (intr_remapping_enabled)
+			panic("timer doesn't work through Interrupt-remapped IO-APIC");
+		local_irq_disable();
+		clear_IO_APIC_pin(apic1, pin1);
+		if (!no_pin1)
+			apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
+				    "8254 timer not connected to IO-APIC\n");
+
+		apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer "
+			    "(IRQ0) through the 8259A ...\n");
+		apic_printk(APIC_QUIET, KERN_INFO
+			    "..... (found apic %d pin %d) ...\n", apic2, pin2);
+		/*
+		 * legacy devices should be connected to IO APIC #0
+		 */
+		replace_pin_at_irq_node(cfg, node, apic1, pin1, apic2, pin2);
+		setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
+		legacy_pic->unmask(0);
+		if (timer_irq_works()) {
+			apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
+			timer_through_8259 = 1;
+			goto out;
+		}
+		/*
+		 * Cleanup, just in case ...
+		 */
+		local_irq_disable();
+		legacy_pic->mask(0);
+		clear_IO_APIC_pin(apic2, pin2);
+		apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
+	}
+
+	apic_printk(APIC_QUIET, KERN_INFO
+		    "...trying to set up timer as Virtual Wire IRQ...\n");
+
+	lapic_register_intr(0);
+	apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector);	/* Fixed mode */
+	legacy_pic->unmask(0);
+
+	if (timer_irq_works()) {
+		apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
+		goto out;
+	}
+	local_irq_disable();
+	legacy_pic->mask(0);
+	apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
+	apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
+
+	apic_printk(APIC_QUIET, KERN_INFO
+		    "...trying to set up timer as ExtINT IRQ...\n");
+
+	legacy_pic->init(0);
+	legacy_pic->make_irq(0);
+	apic_write(APIC_LVT0, APIC_DM_EXTINT);
+
+	unlock_ExtINT_logic();
+
+	if (timer_irq_works()) {
+		apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
+		goto out;
+	}
+	local_irq_disable();
+	apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n");
+	if (x2apic_preenabled)
+		apic_printk(APIC_QUIET, KERN_INFO
+			    "Perhaps problem with the pre-enabled x2apic mode\n"
+			    "Try booting with x2apic and interrupt-remapping disabled in the bios.\n");
+	panic("IO-APIC + timer doesn't work!  Boot with apic=debug and send a "
+		"report.  Then try booting with the 'noapic' option.\n");
+out:
+	local_irq_restore(flags);
+}
+
+/*
+ * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
+ * to devices.  However there may be an I/O APIC pin available for
+ * this interrupt regardless.  The pin may be left unconnected, but
+ * typically it will be reused as an ExtINT cascade interrupt for
+ * the master 8259A.  In the MPS case such a pin will normally be
+ * reported as an ExtINT interrupt in the MP table.  With ACPI
+ * there is no provision for ExtINT interrupts, and in the absence
+ * of an override it would be treated as an ordinary ISA I/O APIC
+ * interrupt, that is edge-triggered and unmasked by default.  We
+ * used to do this, but it caused problems on some systems because
+ * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
+ * the same ExtINT cascade interrupt to drive the local APIC of the
+ * bootstrap processor.  Therefore we refrain from routing IRQ2 to
+ * the I/O APIC in all cases now.  No actual device should request
+ * it anyway.  --macro
+ */
+#define PIC_IRQS	(1UL << PIC_CASCADE_IR)
+
+void __init setup_IO_APIC(void)
+{
+
+	/*
+	 * calling enable_IO_APIC() is moved to setup_local_APIC for BP
+	 */
+	io_apic_irqs = legacy_pic->nr_legacy_irqs ? ~PIC_IRQS : ~0UL;
+
+	apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
+	/*
+         * Set up IO-APIC IRQ routing.
+         */
+	x86_init.mpparse.setup_ioapic_ids();
+
+	sync_Arb_IDs();
+	setup_IO_APIC_irqs();
+	init_IO_APIC_traps();
+	if (legacy_pic->nr_legacy_irqs)
+		check_timer();
+}
+
+/*
+ *      Called after all the initialization is done. If we didn't find any
+ *      APIC bugs then we can allow the modify fast path
+ */
+
+static int __init io_apic_bug_finalize(void)
+{
+	if (sis_apic_bug == -1)
+		sis_apic_bug = 0;
+	return 0;
+}
+
+late_initcall(io_apic_bug_finalize);
+
+static void resume_ioapic_id(int ioapic_idx)
+{
+	unsigned long flags;
+	union IO_APIC_reg_00 reg_00;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	reg_00.raw = io_apic_read(ioapic_idx, 0);
+	if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx)) {
+		reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
+		io_apic_write(ioapic_idx, 0, reg_00.raw);
+	}
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+static void ioapic_resume(void)
+{
+	int ioapic_idx;
+
+	for (ioapic_idx = nr_ioapics - 1; ioapic_idx >= 0; ioapic_idx--)
+		resume_ioapic_id(ioapic_idx);
+
+	restore_ioapic_entries();
+}
+
+static struct syscore_ops ioapic_syscore_ops = {
+	.suspend = save_ioapic_entries,
+	.resume = ioapic_resume,
+};
+
+static int __init ioapic_init_ops(void)
+{
+	register_syscore_ops(&ioapic_syscore_ops);
+
+	return 0;
+}
+
+device_initcall(ioapic_init_ops);
+
+/*
+ * Dynamic irq allocate and deallocation
+ */
+unsigned int create_irq_nr(unsigned int from, int node)
+{
+	struct irq_cfg *cfg;
+	unsigned long flags;
+	unsigned int ret = 0;
+	int irq;
+
+	if (from < nr_irqs_gsi)
+		from = nr_irqs_gsi;
+
+	irq = alloc_irq_from(from, node);
+	if (irq < 0)
+		return 0;
+	cfg = alloc_irq_cfg(irq, node);
+	if (!cfg) {
+		free_irq_at(irq, NULL);
+		return 0;
+	}
+
+	raw_spin_lock_irqsave(&vector_lock, flags);
+	if (!__assign_irq_vector(irq, cfg, apic->target_cpus()))
+		ret = irq;
+	raw_spin_unlock_irqrestore(&vector_lock, flags);
+
+	if (ret) {
+		irq_set_chip_data(irq, cfg);
+		irq_clear_status_flags(irq, IRQ_NOREQUEST);
+	} else {
+		free_irq_at(irq, cfg);
+	}
+	return ret;
+}
+
+int create_irq(void)
+{
+	int node = cpu_to_node(0);
+	unsigned int irq_want;
+	int irq;
+
+	irq_want = nr_irqs_gsi;
+	irq = create_irq_nr(irq_want, node);
+
+	if (irq == 0)
+		irq = -1;
+
+	return irq;
+}
+
+void destroy_irq(unsigned int irq)
+{
+	struct irq_cfg *cfg = irq_get_chip_data(irq);
+	unsigned long flags;
+
+	irq_set_status_flags(irq, IRQ_NOREQUEST|IRQ_NOPROBE);
+
+	if (irq_remapped(cfg))
+		free_irte(irq);
+	raw_spin_lock_irqsave(&vector_lock, flags);
+	__clear_irq_vector(irq, cfg);
+	raw_spin_unlock_irqrestore(&vector_lock, flags);
+	free_irq_at(irq, cfg);
+}
+
+/*
+ * MSI message composition
+ */
+#ifdef CONFIG_PCI_MSI
+static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
+			   struct msi_msg *msg, u8 hpet_id)
+{
+	struct irq_cfg *cfg;
+	int err;
+	unsigned dest;
+
+	if (disable_apic)
+		return -ENXIO;
+
+	cfg = irq_cfg(irq);
+	err = assign_irq_vector(irq, cfg, apic->target_cpus());
+	if (err)
+		return err;
+
+	dest = apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus());
+
+	if (irq_remapped(cfg)) {
+		struct irte irte;
+		int ir_index;
+		u16 sub_handle;
+
+		ir_index = map_irq_to_irte_handle(irq, &sub_handle);
+		BUG_ON(ir_index == -1);
+
+		prepare_irte(&irte, cfg->vector, dest);
+
+		/* Set source-id of interrupt request */
+		if (pdev)
+			set_msi_sid(&irte, pdev);
+		else
+			set_hpet_sid(&irte, hpet_id);
+
+		modify_irte(irq, &irte);
+
+		msg->address_hi = MSI_ADDR_BASE_HI;
+		msg->data = sub_handle;
+		msg->address_lo = MSI_ADDR_BASE_LO | MSI_ADDR_IR_EXT_INT |
+				  MSI_ADDR_IR_SHV |
+				  MSI_ADDR_IR_INDEX1(ir_index) |
+				  MSI_ADDR_IR_INDEX2(ir_index);
+	} else {
+		if (x2apic_enabled())
+			msg->address_hi = MSI_ADDR_BASE_HI |
+					  MSI_ADDR_EXT_DEST_ID(dest);
+		else
+			msg->address_hi = MSI_ADDR_BASE_HI;
+
+		msg->address_lo =
+			MSI_ADDR_BASE_LO |
+			((apic->irq_dest_mode == 0) ?
+				MSI_ADDR_DEST_MODE_PHYSICAL:
+				MSI_ADDR_DEST_MODE_LOGICAL) |
+			((apic->irq_delivery_mode != dest_LowestPrio) ?
+				MSI_ADDR_REDIRECTION_CPU:
+				MSI_ADDR_REDIRECTION_LOWPRI) |
+			MSI_ADDR_DEST_ID(dest);
+
+		msg->data =
+			MSI_DATA_TRIGGER_EDGE |
+			MSI_DATA_LEVEL_ASSERT |
+			((apic->irq_delivery_mode != dest_LowestPrio) ?
+				MSI_DATA_DELIVERY_FIXED:
+				MSI_DATA_DELIVERY_LOWPRI) |
+			MSI_DATA_VECTOR(cfg->vector);
+	}
+	return err;
+}
+
+#ifdef CONFIG_SMP
+static int
+msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
+{
+	struct irq_cfg *cfg = data->chip_data;
+	struct msi_msg msg;
+	unsigned int dest;
+
+	if (__ioapic_set_affinity(data, mask, &dest))
+		return -1;
+
+	__get_cached_msi_msg(data->msi_desc, &msg);
+
+	msg.data &= ~MSI_DATA_VECTOR_MASK;
+	msg.data |= MSI_DATA_VECTOR(cfg->vector);
+	msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
+	msg.address_lo |= MSI_ADDR_DEST_ID(dest);
+
+	__write_msi_msg(data->msi_desc, &msg);
+
+	return 0;
+}
+#endif /* CONFIG_SMP */
+
+/*
+ * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
+ * which implement the MSI or MSI-X Capability Structure.
+ */
+static struct irq_chip msi_chip = {
+	.name			= "PCI-MSI",
+	.irq_unmask		= unmask_msi_irq,
+	.irq_mask		= mask_msi_irq,
+	.irq_ack		= ack_apic_edge,
+#ifdef CONFIG_SMP
+	.irq_set_affinity	= msi_set_affinity,
+#endif
+	.irq_retrigger		= ioapic_retrigger_irq,
+};
+
+/*
+ * Map the PCI dev to the corresponding remapping hardware unit
+ * and allocate 'nvec' consecutive interrupt-remapping table entries
+ * in it.
+ */
+static int msi_alloc_irte(struct pci_dev *dev, int irq, int nvec)
+{
+	struct intel_iommu *iommu;
+	int index;
+
+	iommu = map_dev_to_ir(dev);
+	if (!iommu) {
+		printk(KERN_ERR
+		       "Unable to map PCI %s to iommu\n", pci_name(dev));
+		return -ENOENT;
+	}
+
+	index = alloc_irte(iommu, irq, nvec);
+	if (index < 0) {
+		printk(KERN_ERR
+		       "Unable to allocate %d IRTE for PCI %s\n", nvec,
+		       pci_name(dev));
+		return -ENOSPC;
+	}
+	return index;
+}
+
+static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq)
+{
+	struct irq_chip *chip = &msi_chip;
+	struct msi_msg msg;
+	int ret;
+
+	ret = msi_compose_msg(dev, irq, &msg, -1);
+	if (ret < 0)
+		return ret;
+
+	irq_set_msi_desc(irq, msidesc);
+	write_msi_msg(irq, &msg);
+
+	if (irq_remapped(irq_get_chip_data(irq))) {
+		irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
+		irq_remap_modify_chip_defaults(chip);
+	}
+
+	irq_set_chip_and_handler_name(irq, chip, handle_edge_irq, "edge");
+
+	dev_printk(KERN_DEBUG, &dev->dev, "irq %d for MSI/MSI-X\n", irq);
+
+	return 0;
+}
+
+int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+{
+	int node, ret, sub_handle, index = 0;
+	unsigned int irq, irq_want;
+	struct msi_desc *msidesc;
+	struct intel_iommu *iommu = NULL;
+
+	/* x86 doesn't support multiple MSI yet */
+	if (type == PCI_CAP_ID_MSI && nvec > 1)
+		return 1;
+
+	node = dev_to_node(&dev->dev);
+	irq_want = nr_irqs_gsi;
+	sub_handle = 0;
+	list_for_each_entry(msidesc, &dev->msi_list, list) {
+		irq = create_irq_nr(irq_want, node);
+		if (irq == 0)
+			return -1;
+		irq_want = irq + 1;
+		if (!intr_remapping_enabled)
+			goto no_ir;
+
+		if (!sub_handle) {
+			/*
+			 * allocate the consecutive block of IRTE's
+			 * for 'nvec'
+			 */
+			index = msi_alloc_irte(dev, irq, nvec);
+			if (index < 0) {
+				ret = index;
+				goto error;
+			}
+		} else {
+			iommu = map_dev_to_ir(dev);
+			if (!iommu) {
+				ret = -ENOENT;
+				goto error;
+			}
+			/*
+			 * setup the mapping between the irq and the IRTE
+			 * base index, the sub_handle pointing to the
+			 * appropriate interrupt remap table entry.
+			 */
+			set_irte_irq(irq, iommu, index, sub_handle);
+		}
+no_ir:
+		ret = setup_msi_irq(dev, msidesc, irq);
+		if (ret < 0)
+			goto error;
+		sub_handle++;
+	}
+	return 0;
+
+error:
+	destroy_irq(irq);
+	return ret;
+}
+
+void native_teardown_msi_irq(unsigned int irq)
+{
+	destroy_irq(irq);
+}
+
+#ifdef CONFIG_DMAR_TABLE
+#ifdef CONFIG_SMP
+static int
+dmar_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
+		      bool force)
+{
+	struct irq_cfg *cfg = data->chip_data;
+	unsigned int dest, irq = data->irq;
+	struct msi_msg msg;
+
+	if (__ioapic_set_affinity(data, mask, &dest))
+		return -1;
+
+	dmar_msi_read(irq, &msg);
+
+	msg.data &= ~MSI_DATA_VECTOR_MASK;
+	msg.data |= MSI_DATA_VECTOR(cfg->vector);
+	msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
+	msg.address_lo |= MSI_ADDR_DEST_ID(dest);
+	msg.address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(dest);
+
+	dmar_msi_write(irq, &msg);
+
+	return 0;
+}
+
+#endif /* CONFIG_SMP */
+
+static struct irq_chip dmar_msi_type = {
+	.name			= "DMAR_MSI",
+	.irq_unmask		= dmar_msi_unmask,
+	.irq_mask		= dmar_msi_mask,
+	.irq_ack		= ack_apic_edge,
+#ifdef CONFIG_SMP
+	.irq_set_affinity	= dmar_msi_set_affinity,
+#endif
+	.irq_retrigger		= ioapic_retrigger_irq,
+};
+
+int arch_setup_dmar_msi(unsigned int irq)
+{
+	int ret;
+	struct msi_msg msg;
+
+	ret = msi_compose_msg(NULL, irq, &msg, -1);
+	if (ret < 0)
+		return ret;
+	dmar_msi_write(irq, &msg);
+	irq_set_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
+				      "edge");
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_HPET_TIMER
+
+#ifdef CONFIG_SMP
+static int hpet_msi_set_affinity(struct irq_data *data,
+				 const struct cpumask *mask, bool force)
+{
+	struct irq_cfg *cfg = data->chip_data;
+	struct msi_msg msg;
+	unsigned int dest;
+
+	if (__ioapic_set_affinity(data, mask, &dest))
+		return -1;
+
+	hpet_msi_read(data->handler_data, &msg);
+
+	msg.data &= ~MSI_DATA_VECTOR_MASK;
+	msg.data |= MSI_DATA_VECTOR(cfg->vector);
+	msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
+	msg.address_lo |= MSI_ADDR_DEST_ID(dest);
+
+	hpet_msi_write(data->handler_data, &msg);
+
+	return 0;
+}
+
+#endif /* CONFIG_SMP */
+
+static struct irq_chip hpet_msi_type = {
+	.name = "HPET_MSI",
+	.irq_unmask = hpet_msi_unmask,
+	.irq_mask = hpet_msi_mask,
+	.irq_ack = ack_apic_edge,
+#ifdef CONFIG_SMP
+	.irq_set_affinity = hpet_msi_set_affinity,
+#endif
+	.irq_retrigger = ioapic_retrigger_irq,
+};
+
+int arch_setup_hpet_msi(unsigned int irq, unsigned int id)
+{
+	struct irq_chip *chip = &hpet_msi_type;
+	struct msi_msg msg;
+	int ret;
+
+	if (intr_remapping_enabled) {
+		struct intel_iommu *iommu = map_hpet_to_ir(id);
+		int index;
+
+		if (!iommu)
+			return -1;
+
+		index = alloc_irte(iommu, irq, 1);
+		if (index < 0)
+			return -1;
+	}
+
+	ret = msi_compose_msg(NULL, irq, &msg, id);
+	if (ret < 0)
+		return ret;
+
+	hpet_msi_write(irq_get_handler_data(irq), &msg);
+	irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
+	if (irq_remapped(irq_get_chip_data(irq)))
+		irq_remap_modify_chip_defaults(chip);
+
+	irq_set_chip_and_handler_name(irq, chip, handle_edge_irq, "edge");
+	return 0;
+}
+#endif
+
+#endif /* CONFIG_PCI_MSI */
+/*
+ * Hypertransport interrupt support
+ */
+#ifdef CONFIG_HT_IRQ
+
+#ifdef CONFIG_SMP
+
+static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
+{
+	struct ht_irq_msg msg;
+	fetch_ht_irq_msg(irq, &msg);
+
+	msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
+	msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
+
+	msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
+	msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
+
+	write_ht_irq_msg(irq, &msg);
+}
+
+static int
+ht_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
+{
+	struct irq_cfg *cfg = data->chip_data;
+	unsigned int dest;
+
+	if (__ioapic_set_affinity(data, mask, &dest))
+		return -1;
+
+	target_ht_irq(data->irq, dest, cfg->vector);
+	return 0;
+}
+
+#endif
+
+static struct irq_chip ht_irq_chip = {
+	.name			= "PCI-HT",
+	.irq_mask		= mask_ht_irq,
+	.irq_unmask		= unmask_ht_irq,
+	.irq_ack		= ack_apic_edge,
+#ifdef CONFIG_SMP
+	.irq_set_affinity	= ht_set_affinity,
+#endif
+	.irq_retrigger		= ioapic_retrigger_irq,
+};
+
+int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
+{
+	struct irq_cfg *cfg;
+	int err;
+
+	if (disable_apic)
+		return -ENXIO;
+
+	cfg = irq_cfg(irq);
+	err = assign_irq_vector(irq, cfg, apic->target_cpus());
+	if (!err) {
+		struct ht_irq_msg msg;
+		unsigned dest;
+
+		dest = apic->cpu_mask_to_apicid_and(cfg->domain,
+						    apic->target_cpus());
+
+		msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
+
+		msg.address_lo =
+			HT_IRQ_LOW_BASE |
+			HT_IRQ_LOW_DEST_ID(dest) |
+			HT_IRQ_LOW_VECTOR(cfg->vector) |
+			((apic->irq_dest_mode == 0) ?
+				HT_IRQ_LOW_DM_PHYSICAL :
+				HT_IRQ_LOW_DM_LOGICAL) |
+			HT_IRQ_LOW_RQEOI_EDGE |
+			((apic->irq_delivery_mode != dest_LowestPrio) ?
+				HT_IRQ_LOW_MT_FIXED :
+				HT_IRQ_LOW_MT_ARBITRATED) |
+			HT_IRQ_LOW_IRQ_MASKED;
+
+		write_ht_irq_msg(irq, &msg);
+
+		irq_set_chip_and_handler_name(irq, &ht_irq_chip,
+					      handle_edge_irq, "edge");
+
+		dev_printk(KERN_DEBUG, &dev->dev, "irq %d for HT\n", irq);
+	}
+	return err;
+}
+#endif /* CONFIG_HT_IRQ */
+
+static int
+io_apic_setup_irq_pin(unsigned int irq, int node, struct io_apic_irq_attr *attr)
+{
+	struct irq_cfg *cfg = alloc_irq_and_cfg_at(irq, node);
+	int ret;
+
+	if (!cfg)
+		return -EINVAL;
+	ret = __add_pin_to_irq_node(cfg, node, attr->ioapic, attr->ioapic_pin);
+	if (!ret)
+		setup_ioapic_irq(irq, cfg, attr);
+	return ret;
+}
+
+int io_apic_setup_irq_pin_once(unsigned int irq, int node,
+			       struct io_apic_irq_attr *attr)
+{
+	unsigned int ioapic_idx = attr->ioapic, pin = attr->ioapic_pin;
+	int ret;
+
+	/* Avoid redundant programming */
+	if (test_bit(pin, ioapics[ioapic_idx].pin_programmed)) {
+		pr_debug("Pin %d-%d already programmed\n",
+			 mpc_ioapic_id(ioapic_idx), pin);
+		return 0;
+	}
+	ret = io_apic_setup_irq_pin(irq, node, attr);
+	if (!ret)
+		set_bit(pin, ioapics[ioapic_idx].pin_programmed);
+	return ret;
+}
+
+static int __init io_apic_get_redir_entries(int ioapic)
+{
+	union IO_APIC_reg_01	reg_01;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	reg_01.raw = io_apic_read(ioapic, 1);
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+
+	/* The register returns the maximum index redir index
+	 * supported, which is one less than the total number of redir
+	 * entries.
+	 */
+	return reg_01.bits.entries + 1;
+}
+
+static void __init probe_nr_irqs_gsi(void)
+{
+	int nr;
+
+	nr = gsi_top + NR_IRQS_LEGACY;
+	if (nr > nr_irqs_gsi)
+		nr_irqs_gsi = nr;
+
+	printk(KERN_DEBUG "nr_irqs_gsi: %d\n", nr_irqs_gsi);
+}
+
+int get_nr_irqs_gsi(void)
+{
+	return nr_irqs_gsi;
+}
+
+int __init arch_probe_nr_irqs(void)
+{
+	int nr;
+
+	if (nr_irqs > (NR_VECTORS * nr_cpu_ids))
+		nr_irqs = NR_VECTORS * nr_cpu_ids;
+
+	nr = nr_irqs_gsi + 8 * nr_cpu_ids;
+#if defined(CONFIG_PCI_MSI) || defined(CONFIG_HT_IRQ)
+	/*
+	 * for MSI and HT dyn irq
+	 */
+	nr += nr_irqs_gsi * 16;
+#endif
+	if (nr < nr_irqs)
+		nr_irqs = nr;
+
+	return NR_IRQS_LEGACY;
+}
+
+int io_apic_set_pci_routing(struct device *dev, int irq,
+			    struct io_apic_irq_attr *irq_attr)
+{
+	int node;
+
+	if (!IO_APIC_IRQ(irq)) {
+		apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
+			    irq_attr->ioapic);
+		return -EINVAL;
+	}
+
+	node = dev ? dev_to_node(dev) : cpu_to_node(0);
+
+	return io_apic_setup_irq_pin_once(irq, node, irq_attr);
+}
+
+#ifdef CONFIG_X86_32
+static int __init io_apic_get_unique_id(int ioapic, int apic_id)
+{
+	union IO_APIC_reg_00 reg_00;
+	static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
+	physid_mask_t tmp;
+	unsigned long flags;
+	int i = 0;
+
+	/*
+	 * The P4 platform supports up to 256 APIC IDs on two separate APIC
+	 * buses (one for LAPICs, one for IOAPICs), where predecessors only
+	 * supports up to 16 on one shared APIC bus.
+	 *
+	 * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
+	 *      advantage of new APIC bus architecture.
+	 */
+
+	if (physids_empty(apic_id_map))
+		apic->ioapic_phys_id_map(&phys_cpu_present_map, &apic_id_map);
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	reg_00.raw = io_apic_read(ioapic, 0);
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+
+	if (apic_id >= get_physical_broadcast()) {
+		printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
+			"%d\n", ioapic, apic_id, reg_00.bits.ID);
+		apic_id = reg_00.bits.ID;
+	}
+
+	/*
+	 * Every APIC in a system must have a unique ID or we get lots of nice
+	 * 'stuck on smp_invalidate_needed IPI wait' messages.
+	 */
+	if (apic->check_apicid_used(&apic_id_map, apic_id)) {
+
+		for (i = 0; i < get_physical_broadcast(); i++) {
+			if (!apic->check_apicid_used(&apic_id_map, i))
+				break;
+		}
+
+		if (i == get_physical_broadcast())
+			panic("Max apic_id exceeded!\n");
+
+		printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
+			"trying %d\n", ioapic, apic_id, i);
+
+		apic_id = i;
+	}
+
+	apic->apicid_to_cpu_present(apic_id, &tmp);
+	physids_or(apic_id_map, apic_id_map, tmp);
+
+	if (reg_00.bits.ID != apic_id) {
+		reg_00.bits.ID = apic_id;
+
+		raw_spin_lock_irqsave(&ioapic_lock, flags);
+		io_apic_write(ioapic, 0, reg_00.raw);
+		reg_00.raw = io_apic_read(ioapic, 0);
+		raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+
+		/* Sanity check */
+		if (reg_00.bits.ID != apic_id) {
+			printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic);
+			return -1;
+		}
+	}
+
+	apic_printk(APIC_VERBOSE, KERN_INFO
+			"IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
+
+	return apic_id;
+}
+
+static u8 __init io_apic_unique_id(u8 id)
+{
+	if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
+	    !APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
+		return io_apic_get_unique_id(nr_ioapics, id);
+	else
+		return id;
+}
+#else
+static u8 __init io_apic_unique_id(u8 id)
+{
+	int i;
+	DECLARE_BITMAP(used, 256);
+
+	bitmap_zero(used, 256);
+	for (i = 0; i < nr_ioapics; i++) {
+		__set_bit(mpc_ioapic_id(i), used);
+	}
+	if (!test_bit(id, used))
+		return id;
+	return find_first_zero_bit(used, 256);
+}
+#endif
+
+static int __init io_apic_get_version(int ioapic)
+{
+	union IO_APIC_reg_01	reg_01;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&ioapic_lock, flags);
+	reg_01.raw = io_apic_read(ioapic, 1);
+	raw_spin_unlock_irqrestore(&ioapic_lock, flags);
+
+	return reg_01.bits.version;
+}
+
+int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
+{
+	int ioapic, pin, idx;
+
+	if (skip_ioapic_setup)
+		return -1;
+
+	ioapic = mp_find_ioapic(gsi);
+	if (ioapic < 0)
+		return -1;
+
+	pin = mp_find_ioapic_pin(ioapic, gsi);
+	if (pin < 0)
+		return -1;
+
+	idx = find_irq_entry(ioapic, pin, mp_INT);
+	if (idx < 0)
+		return -1;
+
+	*trigger = irq_trigger(idx);
+	*polarity = irq_polarity(idx);
+	return 0;
+}
+
+/*
+ * This function currently is only a helper for the i386 smp boot process where
+ * we need to reprogram the ioredtbls to cater for the cpus which have come online
+ * so mask in all cases should simply be apic->target_cpus()
+ */
+#ifdef CONFIG_SMP
+void __init setup_ioapic_dest(void)
+{
+	int pin, ioapic, irq, irq_entry;
+	const struct cpumask *mask;
+	struct irq_data *idata;
+
+	if (skip_ioapic_setup == 1)
+		return;
+
+	for (ioapic = 0; ioapic < nr_ioapics; ioapic++)
+	for (pin = 0; pin < ioapics[ioapic].nr_registers; pin++) {
+		irq_entry = find_irq_entry(ioapic, pin, mp_INT);
+		if (irq_entry == -1)
+			continue;
+		irq = pin_2_irq(irq_entry, ioapic, pin);
+
+		if ((ioapic > 0) && (irq > 16))
+			continue;
+
+		idata = irq_get_irq_data(irq);
+
+		/*
+		 * Honour affinities which have been set in early boot
+		 */
+		if (!irqd_can_balance(idata) || irqd_affinity_was_set(idata))
+			mask = idata->affinity;
+		else
+			mask = apic->target_cpus();
+
+		if (intr_remapping_enabled)
+			ir_ioapic_set_affinity(idata, mask, false);
+		else
+			ioapic_set_affinity(idata, mask, false);
+	}
+
+}
+#endif
+
+#define IOAPIC_RESOURCE_NAME_SIZE 11
+
+static struct resource *ioapic_resources;
+
+static struct resource * __init ioapic_setup_resources(int nr_ioapics)
+{
+	unsigned long n;
+	struct resource *res;
+	char *mem;
+	int i;
+
+	if (nr_ioapics <= 0)
+		return NULL;
+
+	n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
+	n *= nr_ioapics;
+
+	mem = alloc_bootmem(n);
+	res = (void *)mem;
+
+	mem += sizeof(struct resource) * nr_ioapics;
+
+	for (i = 0; i < nr_ioapics; i++) {
+		res[i].name = mem;
+		res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+		snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
+		mem += IOAPIC_RESOURCE_NAME_SIZE;
+	}
+
+	ioapic_resources = res;
+
+	return res;
+}
+
+void __init ioapic_and_gsi_init(void)
+{
+	io_apic_ops.init();
+}
+
+static void __init __ioapic_init_mappings(void)
+{
+	unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
+	struct resource *ioapic_res;
+	int i;
+
+	ioapic_res = ioapic_setup_resources(nr_ioapics);
+	for (i = 0; i < nr_ioapics; i++) {
+		if (smp_found_config) {
+			ioapic_phys = mpc_ioapic_addr(i);
+#ifdef CONFIG_X86_32
+			if (!ioapic_phys) {
+				printk(KERN_ERR
+				       "WARNING: bogus zero IO-APIC "
+				       "address found in MPTABLE, "
+				       "disabling IO/APIC support!\n");
+				smp_found_config = 0;
+				skip_ioapic_setup = 1;
+				goto fake_ioapic_page;
+			}
+#endif
+		} else {
+#ifdef CONFIG_X86_32
+fake_ioapic_page:
+#endif
+			ioapic_phys = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
+			ioapic_phys = __pa(ioapic_phys);
+		}
+		set_fixmap_nocache(idx, ioapic_phys);
+		apic_printk(APIC_VERBOSE, "mapped IOAPIC to %08lx (%08lx)\n",
+			__fix_to_virt(idx) + (ioapic_phys & ~PAGE_MASK),
+			ioapic_phys);
+		idx++;
+
+		ioapic_res->start = ioapic_phys;
+		ioapic_res->end = ioapic_phys + IO_APIC_SLOT_SIZE - 1;
+		ioapic_res++;
+	}
+
+	probe_nr_irqs_gsi();
+}
+
+void __init ioapic_insert_resources(void)
+{
+	int i;
+	struct resource *r = ioapic_resources;
+
+	if (!r) {
+		if (nr_ioapics > 0)
+			printk(KERN_ERR
+				"IO APIC resources couldn't be allocated.\n");
+		return;
+	}
+
+	for (i = 0; i < nr_ioapics; i++) {
+		insert_resource(&iomem_resource, r);
+		r++;
+	}
+}
+
+int mp_find_ioapic(u32 gsi)
+{
+	int i = 0;
+
+	if (nr_ioapics == 0)
+		return -1;
+
+	/* Find the IOAPIC that manages this GSI. */
+	for (i = 0; i < nr_ioapics; i++) {
+		struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(i);
+		if ((gsi >= gsi_cfg->gsi_base)
+		    && (gsi <= gsi_cfg->gsi_end))
+			return i;
+	}
+
+	printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
+	return -1;
+}
+
+int mp_find_ioapic_pin(int ioapic, u32 gsi)
+{
+	struct mp_ioapic_gsi *gsi_cfg;
+
+	if (WARN_ON(ioapic == -1))
+		return -1;
+
+	gsi_cfg = mp_ioapic_gsi_routing(ioapic);
+	if (WARN_ON(gsi > gsi_cfg->gsi_end))
+		return -1;
+
+	return gsi - gsi_cfg->gsi_base;
+}
+
+static __init int bad_ioapic(unsigned long address)
+{
+	if (nr_ioapics >= MAX_IO_APICS) {
+		pr_warn("WARNING: Max # of I/O APICs (%d) exceeded (found %d), skipping\n",
+			MAX_IO_APICS, nr_ioapics);
+		return 1;
+	}
+	if (!address) {
+		pr_warn("WARNING: Bogus (zero) I/O APIC address found in table, skipping!\n");
+		return 1;
+	}
+	return 0;
+}
+
+static __init int bad_ioapic_register(int idx)
+{
+	union IO_APIC_reg_00 reg_00;
+	union IO_APIC_reg_01 reg_01;
+	union IO_APIC_reg_02 reg_02;
+
+	reg_00.raw = io_apic_read(idx, 0);
+	reg_01.raw = io_apic_read(idx, 1);
+	reg_02.raw = io_apic_read(idx, 2);
+
+	if (reg_00.raw == -1 && reg_01.raw == -1 && reg_02.raw == -1) {
+		pr_warn("I/O APIC 0x%x registers return all ones, skipping!\n",
+			mpc_ioapic_addr(idx));
+		return 1;
+	}
+
+	return 0;
+}
+
+void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
+{
+	int idx = 0;
+	int entries;
+	struct mp_ioapic_gsi *gsi_cfg;
+
+	if (bad_ioapic(address))
+		return;
+
+	idx = nr_ioapics;
+
+	ioapics[idx].mp_config.type = MP_IOAPIC;
+	ioapics[idx].mp_config.flags = MPC_APIC_USABLE;
+	ioapics[idx].mp_config.apicaddr = address;
+
+	set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
+
+	if (bad_ioapic_register(idx)) {
+		clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
+		return;
+	}
+
+	ioapics[idx].mp_config.apicid = io_apic_unique_id(id);
+	ioapics[idx].mp_config.apicver = io_apic_get_version(idx);
+
+	/*
+	 * Build basic GSI lookup table to facilitate gsi->io_apic lookups
+	 * and to prevent reprogramming of IOAPIC pins (PCI GSIs).
+	 */
+	entries = io_apic_get_redir_entries(idx);
+	gsi_cfg = mp_ioapic_gsi_routing(idx);
+	gsi_cfg->gsi_base = gsi_base;
+	gsi_cfg->gsi_end = gsi_base + entries - 1;
+
+	/*
+	 * The number of IO-APIC IRQ registers (== #pins):
+	 */
+	ioapics[idx].nr_registers = entries;
+
+	if (gsi_cfg->gsi_end >= gsi_top)
+		gsi_top = gsi_cfg->gsi_end + 1;
+
+	pr_info("IOAPIC[%d]: apic_id %d, version %d, address 0x%x, GSI %d-%d\n",
+		idx, mpc_ioapic_id(idx),
+		mpc_ioapic_ver(idx), mpc_ioapic_addr(idx),
+		gsi_cfg->gsi_base, gsi_cfg->gsi_end);
+
+	nr_ioapics++;
+}
+
+/* Enable IOAPIC early just for system timer */
+void __init pre_init_apic_IRQ0(void)
+{
+	struct io_apic_irq_attr attr = { 0, 0, 0, 0 };
+
+	printk(KERN_INFO "Early APIC setup for system timer0\n");
+#ifndef CONFIG_SMP
+	physid_set_mask_of_physid(boot_cpu_physical_apicid,
+					 &phys_cpu_present_map);
+#endif
+	setup_local_APIC();
+
+	io_apic_setup_irq_pin(0, 0, &attr);
+	irq_set_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq,
+				      "edge");
+}