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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _ASM_X86_APIC_H
#define _ASM_X86_APIC_H
#include <linux/cpumask.h>
#include <asm/alternative.h>
#include <asm/cpufeature.h>
#include <asm/apicdef.h>
#include <linux/atomic.h>
#include <asm/fixmap.h>
#include <asm/mpspec.h>
#include <asm/msr.h>
#include <asm/hardirq.h>
* Debugging macros
#define APIC_QUIET 0
#define APIC_VERBOSE 1
#define APIC_DEBUG 2
/* Macros for apic_extnmi which controls external NMI masking */
#define APIC_EXTNMI_BSP 0 /* Default */
* Define the default level of output to be very little
* This can be turned up by using apic=verbose for more
* information and apic=debug for _lots_ of information.
* apic_verbosity is defined in apic.c
#define apic_printk(v, s, a...) do { \
if ((v) <= apic_verbosity) \
printk(s, ##a); \
} while (0)
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
extern void generic_apic_probe(void);
static inline void generic_apic_probe(void)
extern int apic_verbosity;
extern int local_apic_timer_c2_ok;
extern int disable_apic;
extern unsigned int lapic_timer_period;
extern enum apic_intr_mode_id apic_intr_mode;
enum apic_intr_mode_id {
extern void __inquire_remote_apic(int apicid);
#else /* CONFIG_SMP */
static inline void __inquire_remote_apic(int apicid)
#endif /* CONFIG_SMP */
static inline void default_inquire_remote_apic(int apicid)
if (apic_verbosity >= APIC_DEBUG)
* With 82489DX we can't rely on apic feature bit
* retrieved via cpuid but still have to deal with
* such an apic chip so we assume that SMP configuration
* is found from MP table (64bit case uses ACPI mostly
* which set smp presence flag as well so we are safe
* to use this helper too).
static inline bool apic_from_smp_config(void)
return smp_found_config && !disable_apic;
* Basic functions accessing APICs.
#include <asm/paravirt.h>
extern int setup_profiling_timer(unsigned int);
static inline void native_apic_mem_write(u32 reg, u32 v)
volatile u32 *addr = (volatile u32 *)(APIC_BASE + reg);
alternative_io("movl %0, %P1", "xchgl %0, %P1", X86_BUG_11AP,
ASM_OUTPUT2("=r" (v), "=m" (*addr)),
ASM_OUTPUT2("0" (v), "m" (*addr)));
static inline u32 native_apic_mem_read(u32 reg)
return *((volatile u32 *)(APIC_BASE + reg));
extern void native_apic_wait_icr_idle(void);
extern u32 native_safe_apic_wait_icr_idle(void);
extern void native_apic_icr_write(u32 low, u32 id);
extern u64 native_apic_icr_read(void);
static inline bool apic_is_x2apic_enabled(void)
u64 msr;
if (rdmsrl_safe(MSR_IA32_APICBASE, &msr))
return false;
return msr & X2APIC_ENABLE;
extern void enable_IR_x2apic(void);
extern int get_physical_broadcast(void);
extern int lapic_get_maxlvt(void);
extern void clear_local_APIC(void);
extern void disconnect_bsp_APIC(int virt_wire_setup);
extern void disable_local_APIC(void);
extern void apic_soft_disable(void);
extern void lapic_shutdown(void);
extern void sync_Arb_IDs(void);
extern void init_bsp_APIC(void);
extern void apic_intr_mode_select(void);
extern void apic_intr_mode_init(void);
extern void init_apic_mappings(void);
void register_lapic_address(unsigned long address);
extern void setup_boot_APIC_clock(void);
extern void setup_secondary_APIC_clock(void);
extern void lapic_update_tsc_freq(void);
#ifdef CONFIG_X86_64
static inline int apic_force_enable(unsigned long addr)
return -1;
extern int apic_force_enable(unsigned long addr);
extern void apic_ap_setup(void);
* On 32bit this is mach-xxx local
#ifdef CONFIG_X86_64
extern int apic_is_clustered_box(void);
static inline int apic_is_clustered_box(void)
return 0;
extern int setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask);
extern void lapic_assign_system_vectors(void);
extern void lapic_assign_legacy_vector(unsigned int isairq, bool replace);
extern void lapic_update_legacy_vectors(void);
extern void lapic_online(void);
extern void lapic_offline(void);
extern bool apic_needs_pit(void);
extern void apic_send_IPI_allbutself(unsigned int vector);
#else /* !CONFIG_X86_LOCAL_APIC */
static inline void lapic_shutdown(void) { }
#define local_apic_timer_c2_ok 1
static inline void init_apic_mappings(void) { }
static inline void disable_local_APIC(void) { }
# define setup_boot_APIC_clock x86_init_noop
# define setup_secondary_APIC_clock x86_init_noop
static inline void lapic_update_tsc_freq(void) { }
static inline void init_bsp_APIC(void) { }
static inline void apic_intr_mode_select(void) { }
static inline void apic_intr_mode_init(void) { }
static inline void lapic_assign_system_vectors(void) { }
static inline void lapic_assign_legacy_vector(unsigned int i, bool r) { }
static inline bool apic_needs_pit(void) { return true; }
#endif /* !CONFIG_X86_LOCAL_APIC */
#ifdef CONFIG_X86_X2APIC
static inline void native_apic_msr_write(u32 reg, u32 v)
if (reg == APIC_DFR || reg == APIC_ID || reg == APIC_LDR ||
reg == APIC_LVR)
wrmsr(APIC_BASE_MSR + (reg >> 4), v, 0);
static inline void native_apic_msr_eoi_write(u32 reg, u32 v)
__wrmsr(APIC_BASE_MSR + (APIC_EOI >> 4), APIC_EOI_ACK, 0);
static inline u32 native_apic_msr_read(u32 reg)
u64 msr;
if (reg == APIC_DFR)
return -1;
rdmsrl(APIC_BASE_MSR + (reg >> 4), msr);
return (u32)msr;
static inline void native_x2apic_wait_icr_idle(void)
/* no need to wait for icr idle in x2apic */
static inline u32 native_safe_x2apic_wait_icr_idle(void)
/* no need to wait for icr idle in x2apic */
return 0;
static inline void native_x2apic_icr_write(u32 low, u32 id)
wrmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), ((__u64) id) << 32 | low);
static inline u64 native_x2apic_icr_read(void)
unsigned long val;
rdmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), val);
return val;
extern int x2apic_mode;
extern int x2apic_phys;
extern void __init x2apic_set_max_apicid(u32 apicid);
extern void __init check_x2apic(void);
extern void x2apic_setup(void);
static inline int x2apic_enabled(void)
return boot_cpu_has(X86_FEATURE_X2APIC) && apic_is_x2apic_enabled();
#define x2apic_supported() (boot_cpu_has(X86_FEATURE_X2APIC))
#else /* !CONFIG_X86_X2APIC */
static inline void check_x2apic(void) { }
static inline void x2apic_setup(void) { }
static inline int x2apic_enabled(void) { return 0; }
#define x2apic_mode (0)
#define x2apic_supported() (0)
#endif /* !CONFIG_X86_X2APIC */
struct irq_data;
* Copyright 2004 James Cleverdon, IBM.
* Generic APIC sub-arch data struct.
* Hacked for x86-64 by James Cleverdon from i386 architecture code by
* Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
* James Cleverdon.
struct apic {
/* Hotpath functions first */
void (*eoi_write)(u32 reg, u32 v);
void (*native_eoi_write)(u32 reg, u32 v);
void (*write)(u32 reg, u32 v);
u32 (*read)(u32 reg);
/* IPI related functions */
void (*wait_icr_idle)(void);
u32 (*safe_wait_icr_idle)(void);
void (*send_IPI)(int cpu, int vector);
void (*send_IPI_mask)(const struct cpumask *mask, int vector);
void (*send_IPI_mask_allbutself)(const struct cpumask *msk, int vec);
void (*send_IPI_allbutself)(int vector);
void (*send_IPI_all)(int vector);
void (*send_IPI_self)(int vector);
u32 disable_esr;
enum apic_delivery_modes delivery_mode;
bool dest_mode_logical;
u32 (*calc_dest_apicid)(unsigned int cpu);
/* ICR related functions */
u64 (*icr_read)(void);
void (*icr_write)(u32 low, u32 high);
/* Probe, setup and smpboot functions */
int (*probe)(void);
int (*acpi_madt_oem_check)(char *oem_id, char *oem_table_id);
int (*apic_id_valid)(u32 apicid);
int (*apic_id_registered)(void);
bool (*check_apicid_used)(physid_mask_t *map, int apicid);
void (*init_apic_ldr)(void);
void (*ioapic_phys_id_map)(physid_mask_t *phys_map, physid_mask_t *retmap);
void (*setup_apic_routing)(void);
int (*cpu_present_to_apicid)(int mps_cpu);
void (*apicid_to_cpu_present)(int phys_apicid, physid_mask_t *retmap);
int (*check_phys_apicid_present)(int phys_apicid);
int (*phys_pkg_id)(int cpuid_apic, int index_msb);
u32 (*get_apic_id)(unsigned long x);
u32 (*set_apic_id)(unsigned int id);
/* wakeup_secondary_cpu */
int (*wakeup_secondary_cpu)(int apicid, unsigned long start_eip);
void (*inquire_remote_apic)(int apicid);
#ifdef CONFIG_X86_32
* Called very early during boot from get_smp_config(). It should
* return the logical apicid. x86_[bios]_cpu_to_apicid is
* initialized before this function is called.
* If logical apicid can't be determined that early, the function
* may return BAD_APICID. Logical apicid will be configured after
* init_apic_ldr() while bringing up CPUs. Note that NUMA affinity
* won't be applied properly during early boot in this case.
int (*x86_32_early_logical_apicid)(int cpu);
char *name;
* Pointer to the local APIC driver in use on this system (there's
* always just one such driver in use - the kernel decides via an
* early probing process which one it picks - and then sticks to it):
extern struct apic *apic;
* APIC drivers are probed based on how they are listed in the .apicdrivers
* section. So the order is important and enforced by the ordering
* of different apic driver files in the Makefile.
* For the files having two apic drivers, we use apic_drivers()
* to enforce the order with in them.
#define apic_driver(sym) \
static const struct apic *__apicdrivers_##sym __used \
__aligned(sizeof(struct apic *)) \
__section(".apicdrivers") = { &sym }
#define apic_drivers(sym1, sym2) \
static struct apic *__apicdrivers_##sym1##sym2[2] __used \
__aligned(sizeof(struct apic *)) \
__section(".apicdrivers") = { &sym1, &sym2 }
extern struct apic *__apicdrivers[], *__apicdrivers_end[];
* APIC functionality to boot other CPUs - only used on SMP:
extern int wakeup_secondary_cpu_via_nmi(int apicid, unsigned long start_eip);
extern int lapic_can_unplug_cpu(void);
static inline u32 apic_read(u32 reg)
return apic->read(reg);
static inline void apic_write(u32 reg, u32 val)
apic->write(reg, val);
static inline void apic_eoi(void)
apic->eoi_write(APIC_EOI, APIC_EOI_ACK);
static inline u64 apic_icr_read(void)
return apic->icr_read();
static inline void apic_icr_write(u32 low, u32 high)
apic->icr_write(low, high);
static inline void apic_wait_icr_idle(void)
static inline u32 safe_apic_wait_icr_idle(void)
return apic->safe_wait_icr_idle();
extern void __init apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v));
#else /* CONFIG_X86_LOCAL_APIC */
static inline u32 apic_read(u32 reg) { return 0; }
static inline void apic_write(u32 reg, u32 val) { }
static inline void apic_eoi(void) { }
static inline u64 apic_icr_read(void) { return 0; }
static inline void apic_icr_write(u32 low, u32 high) { }
static inline void apic_wait_icr_idle(void) { }
static inline u32 safe_apic_wait_icr_idle(void) { return 0; }
static inline void apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v)) {}
#endif /* CONFIG_X86_LOCAL_APIC */
extern void apic_ack_irq(struct irq_data *data);
static inline void ack_APIC_irq(void)
* ack_APIC_irq() actually gets compiled as a single instruction
* ... yummie.
static inline bool lapic_vector_set_in_irr(unsigned int vector)
u32 irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
return !!(irr & (1U << (vector % 32)));
static inline unsigned default_get_apic_id(unsigned long x)
unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR));
if (APIC_XAPIC(ver) || boot_cpu_has(X86_FEATURE_EXTD_APICID))
return (x >> 24) & 0xFF;
return (x >> 24) & 0x0F;
* Warm reset vector position:
extern void generic_bigsmp_probe(void);
#include <asm/smp.h>
DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid);
extern struct apic apic_noop;
static inline unsigned int read_apic_id(void)
unsigned int reg = apic_read(APIC_ID);
return apic->get_apic_id(reg);
extern int default_apic_id_valid(u32 apicid);
extern int default_acpi_madt_oem_check(char *, char *);
extern void default_setup_apic_routing(void);
extern u32 apic_default_calc_apicid(unsigned int cpu);
extern u32 apic_flat_calc_apicid(unsigned int cpu);
extern bool default_check_apicid_used(physid_mask_t *map, int apicid);
extern void default_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap);
extern int default_cpu_present_to_apicid(int mps_cpu);
extern int default_check_phys_apicid_present(int phys_apicid);
#endif /* CONFIG_X86_LOCAL_APIC */
bool apic_id_is_primary_thread(unsigned int id);
void apic_smt_update(void);
static inline bool apic_id_is_primary_thread(unsigned int id) { return false; }
static inline void apic_smt_update(void) { }
struct msi_msg;
struct irq_cfg;
extern void __irq_msi_compose_msg(struct irq_cfg *cfg, struct msi_msg *msg,
bool dmar);
extern void ioapic_zap_locks(void);
#endif /* _ASM_X86_APIC_H */