/* 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>

#define ARCH_APICTIMER_STOPS_ON_C3      1

/*
 * 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 APIC_EXTNMI_ALL         1
#define APIC_EXTNMI_NONE        2

/*
 * 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);
#else
static inline void generic_apic_probe(void)
{
}
#endif

#ifdef CONFIG_X86_LOCAL_APIC

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 {
        APIC_PIC,
        APIC_VIRTUAL_WIRE,
        APIC_VIRTUAL_WIRE_NO_CONFIG,
        APIC_SYMMETRIC_IO,
        APIC_SYMMETRIC_IO_NO_ROUTING
};

#ifdef CONFIG_SMP
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)
                __inquire_remote_apic(apicid);
}

/*
 * 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.
 */
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#endif

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_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;
}
#else
extern int apic_force_enable(unsigned long addr);
#endif

extern void apic_ap_setup(void);

/*
 * On 32bit this is mach-xxx local
 */
#ifdef CONFIG_X86_64
extern int apic_is_clustered_box(void);
#else
static inline int apic_is_clustered_box(void)
{
        return 0;
}
#endif

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_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_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
/*
 * Make previous memory operations globally visible before
 * sending the IPI through x2apic wrmsr. We need a serializing instruction or
 * mfence for this.
 */
static inline void x2apic_wrmsr_fence(void)
{
        asm volatile("mfence" : : : "memory");
}

static inline void native_apic_msr_write(u32 reg, u32 v)
{
        if (reg == APIC_DFR || reg == APIC_ID || reg == APIC_LDR ||
            reg == APIC_LVR)
                return;

        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 */
        return;
}

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 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);

        /* dest_logical is used by the IPI functions */
        u32     dest_logical;
        u32     disable_esr;
        u32     irq_delivery_mode;
        u32     irq_dest_mode;

        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);
#endif
        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:
 */
#ifdef CONFIG_SMP
extern int wakeup_secondary_cpu_via_nmi(int apicid, unsigned long start_eip);
extern int lapic_can_unplug_cpu(void);
#endif

#ifdef CONFIG_X86_LOCAL_APIC

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)
{
        apic->wait_icr_idle();
}

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.
         */
        apic_eoi();
}

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;
        else
                return (x >> 24) & 0x0F;
}

/*
 * Warm reset vector position:
 */
#define TRAMPOLINE_PHYS_LOW             0x467
#define TRAMPOLINE_PHYS_HIGH            0x469

extern void generic_bigsmp_probe(void);

#ifdef CONFIG_X86_LOCAL_APIC

#include <asm/smp.h>

#define APIC_DFR_VALUE  (APIC_DFR_FLAT)

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 */

#ifdef CONFIG_SMP
bool apic_id_is_primary_thread(unsigned int id);
void apic_smt_update(void);
#else
static inline bool apic_id_is_primary_thread(unsigned int id) { return false; }
static inline void apic_smt_update(void) { }
#endif

extern void irq_enter(void);
extern void irq_exit(void);

static inline void entering_irq(void)
{
        irq_enter();
        kvm_set_cpu_l1tf_flush_l1d();
}

static inline void entering_ack_irq(void)
{
        entering_irq();
        ack_APIC_irq();
}

static inline void ipi_entering_ack_irq(void)
{
        irq_enter();
        ack_APIC_irq();
        kvm_set_cpu_l1tf_flush_l1d();
}

static inline void exiting_irq(void)
{
        irq_exit();
}

static inline void exiting_ack_irq(void)
{
        ack_APIC_irq();
        irq_exit();
}

extern void ioapic_zap_locks(void);

#endif /* _ASM_X86_APIC_H */