linux_kernel/arch/x86/include/asm/apic.h

#ifndef _ASM_X86_APIC_H
#define _ASM_X86_APIC_H

#include <linux/cpumask.h>
#include <linux/pm.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/idle.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 unsigned int apic_verbosity;
extern int local_apic_timer_c2_ok;

extern int disable_apic;
extern unsigned int lapic_timer_frequency;

#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 lapic_shutdown(void);
extern void sync_Arb_IDs(void);
extern void init_bsp_APIC(void);
extern void setup_local_APIC(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 int APIC_init_uniprocessor(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 int apic_bsp_setup(bool upmode);
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);

#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
#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 cpu_has_x2apic && apic_is_x2apic_enabled();
}

#define x2apic_supported()	(cpu_has_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 */

#ifdef CONFIG_X86_64
#define	SET_APIC_ID(x)		(apic->set_apic_id(x))
#else

#endif

/*
 * Copyright 2004 James Cleverdon, IBM.
 * Subject to the GNU Public License, v.2
 *
 * 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 {
	char *name;

	int (*probe)(void);
	int (*acpi_madt_oem_check)(char *oem_id, char *oem_table_id);
	int (*apic_id_valid)(int apicid);
	int (*apic_id_registered)(void);

	u32 irq_delivery_mode;
	u32 irq_dest_mode;

	const struct cpumask *(*target_cpus)(void);

	int disable_esr;

	int dest_logical;
	unsigned long (*check_apicid_used)(physid_mask_t *map, int apicid);

	void (*vector_allocation_domain)(int cpu, struct cpumask *retmask,
					 const struct cpumask *mask);
	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);

	unsigned int (*get_apic_id)(unsigned long x);
	unsigned long (*set_apic_id)(unsigned int id);
	unsigned long apic_id_mask;

	int (*cpu_mask_to_apicid_and)(const struct cpumask *cpumask,
				      const struct cpumask *andmask,
				      unsigned int *apicid);

	/* ipi */
	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 *mask,
					 int vector);
	void (*send_IPI_allbutself)(int vector);
	void (*send_IPI_all)(int vector);
	void (*send_IPI_self)(int vector);

	/* wakeup_secondary_cpu */
	int (*wakeup_secondary_cpu)(int apicid, unsigned long start_eip);

	void (*inquire_remote_apic)(int apicid);

	/* apic ops */
	u32 (*read)(u32 reg);
	void (*write)(u32 reg, u32 v);
	/*
	 * ->eoi_write() has the same signature as ->write().
	 *
	 * Drivers can support both ->eoi_write() and ->write() by passing the same
	 * callback value. Kernel can override ->eoi_write() and fall back
	 * on write for EOI.
	 */
	void (*eoi_write)(u32 reg, u32 v);
	u64 (*icr_read)(void);
	void (*icr_write)(u32 low, u32 high);
	void (*wait_icr_idle)(void);
	u32 (*safe_wait_icr_idle)(void);

#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
};

/*
 * 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);
#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 */

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

#ifdef CONFIG_X86_64
extern void apic_send_IPI_self(int vector);

DECLARE_PER_CPU(int, x2apic_extra_bits);

extern int default_cpu_present_to_apicid(int mps_cpu);
extern int default_check_phys_apicid_present(int phys_apicid);
#endif

extern void generic_bigsmp_probe(void);


#ifdef CONFIG_X86_LOCAL_APIC

#include <asm/smp.h>

#define APIC_DFR_VALUE	(APIC_DFR_FLAT)

static inline const struct cpumask *default_target_cpus(void)
{
#ifdef CONFIG_SMP
	return cpu_online_mask;
#else
	return cpumask_of(0);
#endif
}

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

DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid);


static inline unsigned int read_apic_id(void)
{
	unsigned int reg;

	reg = apic_read(APIC_ID);

	return apic->get_apic_id(reg);
}

static inline int default_apic_id_valid(int apicid)
{
	return (apicid < 255);
}

extern int default_acpi_madt_oem_check(char *, char *);

extern void default_setup_apic_routing(void);

extern struct apic apic_noop;

#ifdef CONFIG_X86_32

static inline int noop_x86_32_early_logical_apicid(int cpu)
{
	return BAD_APICID;
}

/*
 * 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...
 */
extern void default_init_apic_ldr(void);

static inline int default_apic_id_registered(void)
{
	return physid_isset(read_apic_id(), phys_cpu_present_map);
}

static inline int default_phys_pkg_id(int cpuid_apic, int index_msb)
{
	return cpuid_apic >> index_msb;
}

#endif

static inline int
flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
			    const struct cpumask *andmask,
			    unsigned int *apicid)
{
	unsigned long cpu_mask = cpumask_bits(cpumask)[0] &
				 cpumask_bits(andmask)[0] &
				 cpumask_bits(cpu_online_mask)[0] &
				 APIC_ALL_CPUS;

	if (likely(cpu_mask)) {
		*apicid = (unsigned int)cpu_mask;
		return 0;
	} else {
		return -EINVAL;
	}
}

extern int
default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
			       const struct cpumask *andmask,
			       unsigned int *apicid);

static inline void
flat_vector_allocation_domain(int cpu, struct cpumask *retmask,
			      const struct cpumask *mask)
{
	/* 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;
}

static inline void
default_vector_allocation_domain(int cpu, struct cpumask *retmask,
				 const struct cpumask *mask)
{
	cpumask_copy(retmask, cpumask_of(cpu));
}

static inline unsigned long default_check_apicid_used(physid_mask_t *map, int apicid)
{
	return physid_isset(apicid, *map);
}

static inline void default_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
{
	*retmap = *phys_map;
}

static inline int __default_cpu_present_to_apicid(int mps_cpu)
{
	if (mps_cpu < nr_cpu_ids && cpu_present(mps_cpu))
		return (int)per_cpu(x86_bios_cpu_apicid, mps_cpu);
	else
		return BAD_APICID;
}

static inline int
__default_check_phys_apicid_present(int phys_apicid)
{
	return physid_isset(phys_apicid, phys_cpu_present_map);
}

#ifdef CONFIG_X86_32
static inline int default_cpu_present_to_apicid(int mps_cpu)
{
	return __default_cpu_present_to_apicid(mps_cpu);
}

static inline int
default_check_phys_apicid_present(int phys_apicid)
{
	return __default_check_phys_apicid_present(phys_apicid);
}
#else
extern int default_cpu_present_to_apicid(int mps_cpu);
extern int default_check_phys_apicid_present(int phys_apicid);
#endif

#endif /* CONFIG_X86_LOCAL_APIC */
extern void irq_enter(void);
extern void irq_exit(void);

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

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

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

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

static inline void exiting_ack_irq(void)
{
	irq_exit();
	/* Ack only at the end to avoid potential reentry */
	ack_APIC_irq();
}

extern void ioapic_zap_locks(void);

#endif /* _ASM_X86_APIC_H */