arch/x86/kernel/apic/apic_flat_64.c - linux - Git at Google

 /*
  * Copyright 2004 James Cleverdon, IBM.
  * Subject to the GNU Public License, v.2
  *
  * Flat APIC subarch code.
  *
  * Hacked for x86-64 by James Cleverdon from i386 architecture code by
  * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
  * James Cleverdon.
  */
 #include <linux/errno.h>
 #include <linux/threads.h>
 #include <linux/cpumask.h>
 #include <linux/string.h>
 #include <linux/kernel.h>
 #include <linux/ctype.h>
 #include <linux/init.h>
 #include <linux/hardirq.h>
 #include <linux/module.h>
 #include <asm/smp.h>
 #include <asm/apic.h>
 #include <asm/ipi.h>

 #ifdef CONFIG_ACPI
 #include <acpi/acpi_bus.h>
 #endif

 static struct apic apic_physflat;
 static struct apic apic_flat;

 struct apic __read_mostly *apic = &apic_flat;
 EXPORT_SYMBOL_GPL(apic);

 static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 {
 	return 1;
 }

 static const struct cpumask *flat_target_cpus(void)
 {
 	return cpu_online_mask;
 }

 static void flat_vector_allocation_domain(int cpu, struct cpumask *retmask)
 {
 	/* Careful. Some cpus do not strictly honor the set of cpus
 	 * specified in the interrupt destination when using lowest
 	 * priority interrupt delivery mode.
 	 *
 	 * In particular there was a hyperthreading cpu observed to
 	 * deliver interrupts to the wrong hyperthread when only one
 	 * hyperthread was specified in the interrupt desitination.
 	 */
 	cpumask_clear(retmask);
 	cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
 }

 /*
  * Set up the logical destination ID.
  *
  * Intel recommends to set DFR, LDR and TPR before enabling
  * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
  * document number 292116).  So here it goes...
  */
 void flat_init_apic_ldr(void)
 {
 	unsigned long val;
 	unsigned long num, id;

 	num = smp_processor_id();
 	id = 1UL << num;
 	apic_write(APIC_DFR, APIC_DFR_FLAT);
 	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
 	val |= SET_APIC_LOGICAL_ID(id);
 	apic_write(APIC_LDR, val);
 }

 static inline void _flat_send_IPI_mask(unsigned long mask, int vector)
 {
 	unsigned long flags;

 	local_irq_save(flags);
 	__default_send_IPI_dest_field(mask, vector, apic->dest_logical);
 	local_irq_restore(flags);
 }

 static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 {
 	unsigned long mask = cpumask_bits(cpumask)[0];

 	_flat_send_IPI_mask(mask, vector);
 }

 static void
  flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
 {
 	unsigned long mask = cpumask_bits(cpumask)[0];
 	int cpu = smp_processor_id();

 	if (cpu < BITS_PER_LONG)
 		clear_bit(cpu, &mask);

 	_flat_send_IPI_mask(mask, vector);
 }

 static void flat_send_IPI_allbutself(int vector)
 {
 	int cpu = smp_processor_id();
 #ifdef	CONFIG_HOTPLUG_CPU
 	int hotplug = 1;
 #else
 	int hotplug = 0;
 #endif
 	if (hotplug || vector == NMI_VECTOR) {
 		if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) {
 			unsigned long mask = cpumask_bits(cpu_online_mask)[0];

 			if (cpu < BITS_PER_LONG)
 				clear_bit(cpu, &mask);

 			_flat_send_IPI_mask(mask, vector);
 		}
 	} else if (num_online_cpus() > 1) {
 		__default_send_IPI_shortcut(APIC_DEST_ALLBUT,
 					    vector, apic->dest_logical);
 	}
 }

 static void flat_send_IPI_all(int vector)
 {
 	if (vector == NMI_VECTOR) {
 		flat_send_IPI_mask(cpu_online_mask, vector);
 	} else {
 		__default_send_IPI_shortcut(APIC_DEST_ALLINC,
 					    vector, apic->dest_logical);
 	}
 }

 static unsigned int flat_get_apic_id(unsigned long x)
 {
 	unsigned int id;

 	id = (((x)>>24) & 0xFFu);

 	return id;
 }

 static unsigned long set_apic_id(unsigned int id)
 {
 	unsigned long x;

 	x = ((id & 0xFFu)<<24);
 	return x;
 }

 static unsigned int read_xapic_id(void)
 {
 	unsigned int id;

 	id = flat_get_apic_id(apic_read(APIC_ID));
 	return id;
 }

 static int flat_apic_id_registered(void)
 {
 	return physid_isset(read_xapic_id(), phys_cpu_present_map);
 }

 static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
 {
 	return initial_apic_id >> index_msb;
 }

 static int flat_probe(void)
 {
 	return 1;
 }

 static struct apic apic_flat =  {
 	.name				= "flat",
 	.probe				= flat_probe,
 	.acpi_madt_oem_check		= flat_acpi_madt_oem_check,
 	.apic_id_registered		= flat_apic_id_registered,

 	.irq_delivery_mode		= dest_LowestPrio,
 	.irq_dest_mode			= 1, /* logical */

 	.target_cpus			= flat_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= APIC_DEST_LOGICAL,
 	.check_apicid_used		= NULL,
 	.check_apicid_present		= NULL,

 	.vector_allocation_domain	= flat_vector_allocation_domain,
 	.init_apic_ldr			= flat_init_apic_ldr,

 	.ioapic_phys_id_map		= NULL,
 	.setup_apic_routing		= NULL,
 	.multi_timer_check		= NULL,
 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
 	.apicid_to_cpu_present		= NULL,
 	.setup_portio_remap		= NULL,
 	.check_phys_apicid_present	= default_check_phys_apicid_present,
 	.enable_apic_mode		= NULL,
 	.phys_pkg_id			= flat_phys_pkg_id,
 	.mps_oem_check			= NULL,

 	.get_apic_id			= flat_get_apic_id,
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xFFu << 24,

 	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,

 	.send_IPI_mask			= flat_send_IPI_mask,
 	.send_IPI_mask_allbutself	= flat_send_IPI_mask_allbutself,
 	.send_IPI_allbutself		= flat_send_IPI_allbutself,
 	.send_IPI_all			= flat_send_IPI_all,
 	.send_IPI_self			= apic_send_IPI_self,

 	.trampoline_phys_low		= DEFAULT_TRAMPOLINE_PHYS_LOW,
 	.trampoline_phys_high		= DEFAULT_TRAMPOLINE_PHYS_HIGH,
 	.wait_for_init_deassert		= NULL,
 	.smp_callin_clear_local_apic	= NULL,
 	.inquire_remote_apic		= default_inquire_remote_apic,

 	.read				= native_apic_mem_read,
 	.write				= native_apic_mem_write,
 	.icr_read			= native_apic_icr_read,
 	.icr_write			= native_apic_icr_write,
 	.wait_icr_idle			= native_apic_wait_icr_idle,
 	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
 };

 /*
  * Physflat mode is used when there are more than 8 CPUs on a system.
  * We cannot use logical delivery in this case because the mask
  * overflows, so use physical mode.
  */
 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 {
 #ifdef CONFIG_ACPI
 	/*
 	 * Quirk: some x86_64 machines can only use physical APIC mode
 	 * regardless of how many processors are present (x86_64 ES7000
 	 * is an example).
 	 */
 	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
 		(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
 		printk(KERN_DEBUG "system APIC only can use physical flat");
 		return 1;
 	}

 	if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
 		printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
 		return 1;
 	}
 #endif

 	return 0;
 }

 static const struct cpumask *physflat_target_cpus(void)
 {
 	return cpu_online_mask;
 }

 static void physflat_vector_allocation_domain(int cpu, struct cpumask *retmask)
 {
 	cpumask_clear(retmask);
 	cpumask_set_cpu(cpu, retmask);
 }

 static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 {
 	default_send_IPI_mask_sequence_phys(cpumask, vector);
 }

 static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
 					      int vector)
 {
 	default_send_IPI_mask_allbutself_phys(cpumask, vector);
 }

 static void physflat_send_IPI_allbutself(int vector)
 {
 	default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
 }

 static void physflat_send_IPI_all(int vector)
 {
 	physflat_send_IPI_mask(cpu_online_mask, vector);
 }

 static unsigned int physflat_cpu_mask_to_apicid(const struct cpumask *cpumask)
 {
 	int cpu;

 	/*
 	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
 	 * May as well be the first.
 	 */
 	cpu = cpumask_first(cpumask);
 	if ((unsigned)cpu < nr_cpu_ids)
 		return per_cpu(x86_cpu_to_apicid, cpu);
 	else
 		return BAD_APICID;
 }

 static unsigned int
 physflat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 				const struct cpumask *andmask)
 {
 	int cpu;

 	/*
 	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
 	 * May as well be the first.
 	 */
 	for_each_cpu_and(cpu, cpumask, andmask) {
 		if (cpumask_test_cpu(cpu, cpu_online_mask))
 			break;
 	}
 	return per_cpu(x86_cpu_to_apicid, cpu);
 }

 static int physflat_probe(void)
 {
 	if (apic == &apic_physflat || num_possible_cpus() > 8)
 		return 1;

 	return 0;
 }

 static struct apic apic_physflat =  {

 	.name				= "physical flat",
 	.probe				= physflat_probe,
 	.acpi_madt_oem_check		= physflat_acpi_madt_oem_check,
 	.apic_id_registered		= flat_apic_id_registered,

 	.irq_delivery_mode		= dest_Fixed,
 	.irq_dest_mode			= 0, /* physical */

 	.target_cpus			= physflat_target_cpus,
 	.disable_esr			= 0,
 	.dest_logical			= 0,
 	.check_apicid_used		= NULL,
 	.check_apicid_present		= NULL,

 	.vector_allocation_domain	= physflat_vector_allocation_domain,
 	/* not needed, but shouldn't hurt: */
 	.init_apic_ldr			= flat_init_apic_ldr,

 	.ioapic_phys_id_map		= NULL,
 	.setup_apic_routing		= NULL,
 	.multi_timer_check		= NULL,
 	.cpu_present_to_apicid		= default_cpu_present_to_apicid,
 	.apicid_to_cpu_present		= NULL,
 	.setup_portio_remap		= NULL,
 	.check_phys_apicid_present	= default_check_phys_apicid_present,
 	.enable_apic_mode		= NULL,
 	.phys_pkg_id			= flat_phys_pkg_id,
 	.mps_oem_check			= NULL,

 	.get_apic_id			= flat_get_apic_id,
 	.set_apic_id			= set_apic_id,
 	.apic_id_mask			= 0xFFu << 24,

 	.cpu_mask_to_apicid		= physflat_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= physflat_cpu_mask_to_apicid_and,

 	.send_IPI_mask			= physflat_send_IPI_mask,
 	.send_IPI_mask_allbutself	= physflat_send_IPI_mask_allbutself,
 	.send_IPI_allbutself		= physflat_send_IPI_allbutself,
 	.send_IPI_all			= physflat_send_IPI_all,
 	.send_IPI_self			= apic_send_IPI_self,

 	.trampoline_phys_low		= DEFAULT_TRAMPOLINE_PHYS_LOW,
 	.trampoline_phys_high		= DEFAULT_TRAMPOLINE_PHYS_HIGH,
 	.wait_for_init_deassert		= NULL,
 	.smp_callin_clear_local_apic	= NULL,
 	.inquire_remote_apic		= default_inquire_remote_apic,

 	.read				= native_apic_mem_read,
 	.write				= native_apic_mem_write,
 	.icr_read			= native_apic_icr_read,
 	.icr_write			= native_apic_icr_write,
 	.wait_icr_idle			= native_apic_wait_icr_idle,
 	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,
 };

 /*
  * We need to check for physflat first, so this order is important.
  */
 apic_drivers(apic_physflat, apic_flat);
	/*
	* Copyright 2004 James Cleverdon, IBM.
	* Subject to the GNU Public License, v.2
	*
	* Flat APIC subarch code.
	*
	* Hacked for x86-64 by James Cleverdon from i386 architecture code by
	* Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
	* James Cleverdon.
	*/
	#include <linux/errno.h>
	#include <linux/threads.h>
	#include <linux/cpumask.h>
	#include <linux/string.h>
	#include <linux/kernel.h>
	#include <linux/ctype.h>
	#include <linux/init.h>
	#include <linux/hardirq.h>
	#include <linux/module.h>
	#include <asm/smp.h>
	#include <asm/apic.h>
	#include <asm/ipi.h>

	#ifdef CONFIG_ACPI
	#include <acpi/acpi_bus.h>
	#endif

	static struct apic apic_physflat;
	static struct apic apic_flat;

	struct apic __read_mostly *apic = &apic_flat;
	EXPORT_SYMBOL_GPL(apic);

	static int flat_acpi_madt_oem_check(char oem_id, char oem_table_id)
	{
	return 1;
	}

	static const struct cpumask *flat_target_cpus(void)
	{
	return cpu_online_mask;
	}

	static void flat_vector_allocation_domain(int cpu, struct cpumask *retmask)
	{
	/* Careful. Some cpus do not strictly honor the set of cpus
	* specified in the interrupt destination when using lowest
	* priority interrupt delivery mode.
	*
	* In particular there was a hyperthreading cpu observed to
	* deliver interrupts to the wrong hyperthread when only one
	* hyperthread was specified in the interrupt desitination.
	*/
	cpumask_clear(retmask);
	cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
	}

	/*
	* Set up the logical destination ID.
	*
	* Intel recommends to set DFR, LDR and TPR before enabling
	* an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
	* document number 292116). So here it goes...
	*/
	void flat_init_apic_ldr(void)
	{
	unsigned long val;
	unsigned long num, id;

	num = smp_processor_id();
	id = 1UL << num;
	apic_write(APIC_DFR, APIC_DFR_FLAT);
	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
	val \|= SET_APIC_LOGICAL_ID(id);
	apic_write(APIC_LDR, val);
	}

	static inline void _flat_send_IPI_mask(unsigned long mask, int vector)
	{
	unsigned long flags;

	local_irq_save(flags);
	__default_send_IPI_dest_field(mask, vector, apic->dest_logical);
	local_irq_restore(flags);
	}

	static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
	{
	unsigned long mask = cpumask_bits(cpumask)[0];

	_flat_send_IPI_mask(mask, vector);
	}

	static void
	flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
	{
	unsigned long mask = cpumask_bits(cpumask)[0];
	int cpu = smp_processor_id();

	if (cpu < BITS_PER_LONG)
	clear_bit(cpu, &mask);

	_flat_send_IPI_mask(mask, vector);
	}

	static void flat_send_IPI_allbutself(int vector)
	{
	int cpu = smp_processor_id();
	#ifdef CONFIG_HOTPLUG_CPU
	int hotplug = 1;
	#else
	int hotplug = 0;
	#endif
	if (hotplug \|\| vector == NMI_VECTOR) {
	if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) {
	unsigned long mask = cpumask_bits(cpu_online_mask)[0];

	if (cpu < BITS_PER_LONG)
	clear_bit(cpu, &mask);

	_flat_send_IPI_mask(mask, vector);
	}
	} else if (num_online_cpus() > 1) {
	__default_send_IPI_shortcut(APIC_DEST_ALLBUT,
	vector, apic->dest_logical);
	}
	}

	static void flat_send_IPI_all(int vector)
	{
	if (vector == NMI_VECTOR) {
	flat_send_IPI_mask(cpu_online_mask, vector);
	} else {
	__default_send_IPI_shortcut(APIC_DEST_ALLINC,
	vector, apic->dest_logical);
	}
	}

	static unsigned int flat_get_apic_id(unsigned long x)
	{
	unsigned int id;

	id = (((x)>>24) & 0xFFu);

	return id;
	}

	static unsigned long set_apic_id(unsigned int id)
	{
	unsigned long x;

	x = ((id & 0xFFu)<<24);
	return x;
	}

	static unsigned int read_xapic_id(void)
	{
	unsigned int id;

	id = flat_get_apic_id(apic_read(APIC_ID));
	return id;
	}

	static int flat_apic_id_registered(void)
	{
	return physid_isset(read_xapic_id(), phys_cpu_present_map);
	}

	static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
	{
	return initial_apic_id >> index_msb;
	}

	static int flat_probe(void)
	{
	return 1;
	}

	static struct apic apic_flat = {
	.name = "flat",
	.probe = flat_probe,
	.acpi_madt_oem_check = flat_acpi_madt_oem_check,
	.apic_id_registered = flat_apic_id_registered,

	.irq_delivery_mode = dest_LowestPrio,
	.irq_dest_mode = 1, /* logical */

	.target_cpus = flat_target_cpus,
	.disable_esr = 0,
	.dest_logical = APIC_DEST_LOGICAL,
	.check_apicid_used = NULL,
	.check_apicid_present = NULL,

	.vector_allocation_domain = flat_vector_allocation_domain,
	.init_apic_ldr = flat_init_apic_ldr,

	.ioapic_phys_id_map = NULL,
	.setup_apic_routing = NULL,
	.multi_timer_check = NULL,
	.cpu_present_to_apicid = default_cpu_present_to_apicid,
	.apicid_to_cpu_present = NULL,
	.setup_portio_remap = NULL,
	.check_phys_apicid_present = default_check_phys_apicid_present,
	.enable_apic_mode = NULL,
	.phys_pkg_id = flat_phys_pkg_id,
	.mps_oem_check = NULL,

	.get_apic_id = flat_get_apic_id,
	.set_apic_id = set_apic_id,
	.apic_id_mask = 0xFFu << 24,

	.cpu_mask_to_apicid = default_cpu_mask_to_apicid,
	.cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and,

	.send_IPI_mask = flat_send_IPI_mask,
	.send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself,
	.send_IPI_allbutself = flat_send_IPI_allbutself,
	.send_IPI_all = flat_send_IPI_all,
	.send_IPI_self = apic_send_IPI_self,

	.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
	.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
	.wait_for_init_deassert = NULL,
	.smp_callin_clear_local_apic = NULL,
	.inquire_remote_apic = default_inquire_remote_apic,

	.read = native_apic_mem_read,
	.write = native_apic_mem_write,
	.icr_read = native_apic_icr_read,
	.icr_write = native_apic_icr_write,
	.wait_icr_idle = native_apic_wait_icr_idle,
	.safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
	};

	/*
	* Physflat mode is used when there are more than 8 CPUs on a system.
	* We cannot use logical delivery in this case because the mask
	* overflows, so use physical mode.
	*/
	static int physflat_acpi_madt_oem_check(char oem_id, char oem_table_id)
	{
	#ifdef CONFIG_ACPI
	/*
	* Quirk: some x86_64 machines can only use physical APIC mode
	* regardless of how many processors are present (x86_64 ES7000
	* is an example).
	*/
	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
	(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
	printk(KERN_DEBUG "system APIC only can use physical flat");
	return 1;
	}

	if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
	printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
	return 1;
	}
	#endif

	return 0;
	}

	static const struct cpumask *physflat_target_cpus(void)
	{
	return cpu_online_mask;
	}

	static void physflat_vector_allocation_domain(int cpu, struct cpumask *retmask)
	{
	cpumask_clear(retmask);
	cpumask_set_cpu(cpu, retmask);
	}

	static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
	{
	default_send_IPI_mask_sequence_phys(cpumask, vector);
	}

	static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
	int vector)
	{
	default_send_IPI_mask_allbutself_phys(cpumask, vector);
	}

	static void physflat_send_IPI_allbutself(int vector)
	{
	default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
	}

	static void physflat_send_IPI_all(int vector)
	{
	physflat_send_IPI_mask(cpu_online_mask, vector);
	}

	static unsigned int physflat_cpu_mask_to_apicid(const struct cpumask *cpumask)
	{
	int cpu;

	/*
	* We're using fixed IRQ delivery, can only return one phys APIC ID.
	* May as well be the first.
	*/
	cpu = cpumask_first(cpumask);
	if ((unsigned)cpu < nr_cpu_ids)
	return per_cpu(x86_cpu_to_apicid, cpu);
	else
	return BAD_APICID;
	}

	static unsigned int
	physflat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
	const struct cpumask *andmask)
	{
	int cpu;

	/*
	* We're using fixed IRQ delivery, can only return one phys APIC ID.
	* May as well be the first.
	*/
	for_each_cpu_and(cpu, cpumask, andmask) {
	if (cpumask_test_cpu(cpu, cpu_online_mask))
	break;
	}
	return per_cpu(x86_cpu_to_apicid, cpu);
	}

	static int physflat_probe(void)
	{
	if (apic == &apic_physflat \|\| num_possible_cpus() > 8)
	return 1;

	return 0;
	}

	static struct apic apic_physflat = {

	.name = "physical flat",
	.probe = physflat_probe,
	.acpi_madt_oem_check = physflat_acpi_madt_oem_check,
	.apic_id_registered = flat_apic_id_registered,

	.irq_delivery_mode = dest_Fixed,
	.irq_dest_mode = 0, /* physical */

	.target_cpus = physflat_target_cpus,
	.disable_esr = 0,
	.dest_logical = 0,
	.check_apicid_used = NULL,
	.check_apicid_present = NULL,

	.vector_allocation_domain = physflat_vector_allocation_domain,
	/* not needed, but shouldn't hurt: */
	.init_apic_ldr = flat_init_apic_ldr,

	.ioapic_phys_id_map = NULL,
	.setup_apic_routing = NULL,
	.multi_timer_check = NULL,
	.cpu_present_to_apicid = default_cpu_present_to_apicid,
	.apicid_to_cpu_present = NULL,
	.setup_portio_remap = NULL,
	.check_phys_apicid_present = default_check_phys_apicid_present,
	.enable_apic_mode = NULL,
	.phys_pkg_id = flat_phys_pkg_id,
	.mps_oem_check = NULL,

	.get_apic_id = flat_get_apic_id,
	.set_apic_id = set_apic_id,
	.apic_id_mask = 0xFFu << 24,

	.cpu_mask_to_apicid = physflat_cpu_mask_to_apicid,
	.cpu_mask_to_apicid_and = physflat_cpu_mask_to_apicid_and,

	.send_IPI_mask = physflat_send_IPI_mask,
	.send_IPI_mask_allbutself = physflat_send_IPI_mask_allbutself,
	.send_IPI_allbutself = physflat_send_IPI_allbutself,
	.send_IPI_all = physflat_send_IPI_all,
	.send_IPI_self = apic_send_IPI_self,

	.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
	.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
	.wait_for_init_deassert = NULL,
	.smp_callin_clear_local_apic = NULL,
	.inquire_remote_apic = default_inquire_remote_apic,

	.read = native_apic_mem_read,
	.write = native_apic_mem_write,
	.icr_read = native_apic_icr_read,
	.icr_write = native_apic_icr_write,
	.wait_icr_idle = native_apic_wait_icr_idle,
	.safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
	};

	/*
	* We need to check for physflat first, so this order is important.
	*/
	apic_drivers(apic_physflat, apic_flat);