arch/x86/include/asm/apic.h

   1 #ifndef _ASM_X86_APIC_H
   2 #define _ASM_X86_APIC_H
   3
   4 #include <linux/cpumask.h>
   5 #include <linux/pm.h>
   6
   7 #include <asm/alternative.h>
   8 #include <asm/cpufeature.h>
   9 #include <asm/processor.h>
  10 #include <asm/apicdef.h>
  11 #include <linux/atomic.h>
  12 #include <asm/fixmap.h>
  13 #include <asm/mpspec.h>
  14 #include <asm/msr.h>
  15 #include <asm/idle.h>
  16
  17 #define ARCH_APICTIMER_STOPS_ON_C3      1
  18
  19 /*
  20  * Debugging macros
  21  */
  22 #define APIC_QUIET   0
  23 #define APIC_VERBOSE 1
  24 #define APIC_DEBUG   2
  25
  26 /*
  27  * Define the default level of output to be very little
  28  * This can be turned up by using apic=verbose for more
  29  * information and apic=debug for _lots_ of information.
  30  * apic_verbosity is defined in apic.c
  31  */
  32 #define apic_printk(v, s, a...) do {       \
  33                 if ((v) <= apic_verbosity) \
  34                         printk(s, ##a);    \
  35         } while (0)
  36
  37
  38 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
  39 extern void generic_apic_probe(void);
  40 #else
  41 static inline void generic_apic_probe(void)
  42 {
  43 }
  44 #endif
  45
  46 #ifdef CONFIG_X86_LOCAL_APIC
  47
  48 extern unsigned int apic_verbosity;
  49 extern int local_apic_timer_c2_ok;
  50
  51 extern int disable_apic;
  52 extern unsigned int lapic_timer_frequency;
  53
  54 #ifdef CONFIG_SMP
  55 extern void __inquire_remote_apic(int apicid);
  56 #else /* CONFIG_SMP */
  57 static inline void __inquire_remote_apic(int apicid)
  58 {
  59 }
  60 #endif /* CONFIG_SMP */
  61
  62 static inline void default_inquire_remote_apic(int apicid)
  63 {
  64         if (apic_verbosity >= APIC_DEBUG)
  65                 __inquire_remote_apic(apicid);
  66 }
  67
  68 /*
  69  * With 82489DX we can't rely on apic feature bit
  70  * retrieved via cpuid but still have to deal with
  71  * such an apic chip so we assume that SMP configuration
  72  * is found from MP table (64bit case uses ACPI mostly
  73  * which set smp presence flag as well so we are safe
  74  * to use this helper too).
  75  */
  76 static inline bool apic_from_smp_config(void)
  77 {
  78         return smp_found_config && !disable_apic;
  79 }
  80
  81 /*
  82  * Basic functions accessing APICs.
  83  */
  84 #ifdef CONFIG_PARAVIRT
  85 #include <asm/paravirt.h>
  86 #endif
  87
  88 #ifdef CONFIG_X86_64
  89 extern int is_vsmp_box(void);
  90 #else
  91 static inline int is_vsmp_box(void)
  92 {
  93         return 0;
  94 }
  95 #endif
  96 extern void xapic_wait_icr_idle(void);
  97 extern u32 safe_xapic_wait_icr_idle(void);
  98 extern void xapic_icr_write(u32, u32);
  99 extern int setup_profiling_timer(unsigned int);
 100
 101 static inline void native_apic_mem_write(u32 reg, u32 v)
 102 {
 103         volatile u32 *addr = (volatile u32 *)(APIC_BASE + reg);
 104
 105         alternative_io("movl %0, %1", "xchgl %0, %1", X86_FEATURE_11AP,
 106                        ASM_OUTPUT2("=r" (v), "=m" (*addr)),
 107                        ASM_OUTPUT2("0" (v), "m" (*addr)));
 108 }
 109
 110 static inline u32 native_apic_mem_read(u32 reg)
 111 {
 112         return *((volatile u32 *)(APIC_BASE + reg));
 113 }
 114
 115 extern void native_apic_wait_icr_idle(void);
 116 extern u32 native_safe_apic_wait_icr_idle(void);
 117 extern void native_apic_icr_write(u32 low, u32 id);
 118 extern u64 native_apic_icr_read(void);
 119
 120 extern int x2apic_mode;
 121
 122 #ifdef CONFIG_X86_X2APIC
 123 /*
 124  * Make previous memory operations globally visible before
 125  * sending the IPI through x2apic wrmsr. We need a serializing instruction or
 126  * mfence for this.
 127  */
 128 static inline void x2apic_wrmsr_fence(void)
 129 {
 130         asm volatile("mfence" : : : "memory");
 131 }
 132
 133 static inline void native_apic_msr_write(u32 reg, u32 v)
 134 {
 135         if (reg == APIC_DFR || reg == APIC_ID || reg == APIC_LDR ||
 136             reg == APIC_LVR)
 137                 return;
 138
 139         wrmsr(APIC_BASE_MSR + (reg >> 4), v, 0);
 140 }
 141
 142 static inline void native_apic_msr_eoi_write(u32 reg, u32 v)
 143 {
 144         wrmsr(APIC_BASE_MSR + (APIC_EOI >> 4), APIC_EOI_ACK, 0);
 145 }
 146
 147 static inline u32 native_apic_msr_read(u32 reg)
 148 {
 149         u64 msr;
 150
 151         if (reg == APIC_DFR)
 152                 return -1;
 153
 154         rdmsrl(APIC_BASE_MSR + (reg >> 4), msr);
 155         return (u32)msr;
 156 }
 157
 158 static inline void native_x2apic_wait_icr_idle(void)
 159 {
 160         /* no need to wait for icr idle in x2apic */
 161         return;
 162 }
 163
 164 static inline u32 native_safe_x2apic_wait_icr_idle(void)
 165 {
 166         /* no need to wait for icr idle in x2apic */
 167         return 0;
 168 }
 169
 170 static inline void native_x2apic_icr_write(u32 low, u32 id)
 171 {
 172         wrmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), ((__u64) id) << 32 | low);
 173 }
 174
 175 static inline u64 native_x2apic_icr_read(void)
 176 {
 177         unsigned long val;
 178
 179         rdmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), val);
 180         return val;
 181 }
 182
 183 extern int x2apic_phys;
 184 extern int x2apic_preenabled;
 185 extern void check_x2apic(void);
 186 extern void enable_x2apic(void);
 187 extern void x2apic_icr_write(u32 low, u32 id);
 188 static inline int x2apic_enabled(void)
 189 {
 190         u64 msr;
 191
 192         if (!cpu_has_x2apic)
 193                 return 0;
 194
 195         rdmsrl(MSR_IA32_APICBASE, msr);
 196         if (msr & X2APIC_ENABLE)
 197                 return 1;
 198         return 0;
 199 }
 200
 201 #define x2apic_supported()      (cpu_has_x2apic)
 202 static inline void x2apic_force_phys(void)
 203 {
 204         x2apic_phys = 1;
 205 }
 206 #else
 207 static inline void disable_x2apic(void)
 208 {
 209 }
 210 static inline void check_x2apic(void)
 211 {
 212 }
 213 static inline void enable_x2apic(void)
 214 {
 215 }
 216 static inline int x2apic_enabled(void)
 217 {
 218         return 0;
 219 }
 220 static inline void x2apic_force_phys(void)
 221 {
 222 }
 223
 224 #define nox2apic        0
 225 #define x2apic_preenabled 0
 226 #define x2apic_supported()      0
 227 #endif
 228
 229 extern void enable_IR_x2apic(void);
 230
 231 extern int get_physical_broadcast(void);
 232
 233 extern int lapic_get_maxlvt(void);
 234 extern void clear_local_APIC(void);
 235 extern void connect_bsp_APIC(void);
 236 extern void disconnect_bsp_APIC(int virt_wire_setup);
 237 extern void disable_local_APIC(void);
 238 extern void lapic_shutdown(void);
 239 extern int verify_local_APIC(void);
 240 extern void sync_Arb_IDs(void);
 241 extern void init_bsp_APIC(void);
 242 extern void setup_local_APIC(void);
 243 extern void end_local_APIC_setup(void);
 244 extern void bsp_end_local_APIC_setup(void);
 245 extern void init_apic_mappings(void);
 246 void register_lapic_address(unsigned long address);
 247 extern void setup_boot_APIC_clock(void);
 248 extern void setup_secondary_APIC_clock(void);
 249 extern int APIC_init_uniprocessor(void);
 250 extern int apic_force_enable(unsigned long addr);
 251
 252 /*
 253  * On 32bit this is mach-xxx local
 254  */
 255 #ifdef CONFIG_X86_64
 256 extern int apic_is_clustered_box(void);
 257 #else
 258 static inline int apic_is_clustered_box(void)
 259 {
 260         return 0;
 261 }
 262 #endif
 263
 264 extern int setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask);
 265
 266 #else /* !CONFIG_X86_LOCAL_APIC */
 267 static inline void lapic_shutdown(void) { }
 268 #define local_apic_timer_c2_ok          1
 269 static inline void init_apic_mappings(void) { }
 270 static inline void disable_local_APIC(void) { }
 271 # define setup_boot_APIC_clock x86_init_noop
 272 # define setup_secondary_APIC_clock x86_init_noop
 273 #endif /* !CONFIG_X86_LOCAL_APIC */
 274
 275 #ifdef CONFIG_X86_64
 276 #define SET_APIC_ID(x)          (apic->set_apic_id(x))
 277 #else
 278
 279 #endif
 280
 281 /*
 282  * Copyright 2004 James Cleverdon, IBM.
 283  * Subject to the GNU Public License, v.2
 284  *
 285  * Generic APIC sub-arch data struct.
 286  *
 287  * Hacked for x86-64 by James Cleverdon from i386 architecture code by
 288  * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
 289  * James Cleverdon.
 290  */
 291 struct apic {
 292         char *name;
 293
 294         int (*probe)(void);
 295         int (*acpi_madt_oem_check)(char *oem_id, char *oem_table_id);
 296         int (*apic_id_valid)(int apicid);
 297         int (*apic_id_registered)(void);
 298
 299         u32 irq_delivery_mode;
 300         u32 irq_dest_mode;
 301
 302         const struct cpumask *(*target_cpus)(void);
 303
 304         int disable_esr;
 305
 306         int dest_logical;
 307         unsigned long (*check_apicid_used)(physid_mask_t *map, int apicid);
 308         unsigned long (*check_apicid_present)(int apicid);
 309
 310         void (*vector_allocation_domain)(int cpu, struct cpumask *retmask,
 311                                          const struct cpumask *mask);
 312         void (*init_apic_ldr)(void);
 313
 314         void (*ioapic_phys_id_map)(physid_mask_t *phys_map, physid_mask_t *retmap);
 315
 316         void (*setup_apic_routing)(void);
 317         int (*multi_timer_check)(int apic, int irq);
 318         int (*cpu_present_to_apicid)(int mps_cpu);
 319         void (*apicid_to_cpu_present)(int phys_apicid, physid_mask_t *retmap);
 320         void (*setup_portio_remap)(void);
 321         int (*check_phys_apicid_present)(int phys_apicid);
 322         void (*enable_apic_mode)(void);
 323         int (*phys_pkg_id)(int cpuid_apic, int index_msb);
 324
 325         /*
 326          * When one of the next two hooks returns 1 the apic
 327          * is switched to this. Essentially they are additional
 328          * probe functions:
 329          */
 330         int (*mps_oem_check)(struct mpc_table *mpc, char *oem, char *productid);
 331
 332         unsigned int (*get_apic_id)(unsigned long x);
 333         unsigned long (*set_apic_id)(unsigned int id);
 334         unsigned long apic_id_mask;
 335
 336         int (*cpu_mask_to_apicid_and)(const struct cpumask *cpumask,
 337                                       const struct cpumask *andmask,
 338                                       unsigned int *apicid);
 339
 340         /* ipi */
 341         void (*send_IPI_mask)(const struct cpumask *mask, int vector);
 342         void (*send_IPI_mask_allbutself)(const struct cpumask *mask,
 343                                          int vector);
 344         void (*send_IPI_allbutself)(int vector);
 345         void (*send_IPI_all)(int vector);
 346         void (*send_IPI_self)(int vector);
 347
 348         /* wakeup_secondary_cpu */
 349         int (*wakeup_secondary_cpu)(int apicid, unsigned long start_eip);
 350
 351         int trampoline_phys_low;
 352         int trampoline_phys_high;
 353
 354         void (*wait_for_init_deassert)(atomic_t *deassert);
 355         void (*smp_callin_clear_local_apic)(void);
 356         void (*inquire_remote_apic)(int apicid);
 357
 358         /* apic ops */
 359         u32 (*read)(u32 reg);
 360         void (*write)(u32 reg, u32 v);
 361         /*
 362          * ->eoi_write() has the same signature as ->write().
 363          *
 364          * Drivers can support both ->eoi_write() and ->write() by passing the same
 365          * callback value. Kernel can override ->eoi_write() and fall back
 366          * on write for EOI.
 367          */
 368         void (*eoi_write)(u32 reg, u32 v);
 369         u64 (*icr_read)(void);
 370         void (*icr_write)(u32 low, u32 high);
 371         void (*wait_icr_idle)(void);
 372         u32 (*safe_wait_icr_idle)(void);
 373
 374 #ifdef CONFIG_X86_32
 375         /*
 376          * Called very early during boot from get_smp_config().  It should
 377          * return the logical apicid.  x86_[bios]_cpu_to_apicid is
 378          * initialized before this function is called.
 379          *
 380          * If logical apicid can't be determined that early, the function
 381          * may return BAD_APICID.  Logical apicid will be configured after
 382          * init_apic_ldr() while bringing up CPUs.  Note that NUMA affinity
 383          * won't be applied properly during early boot in this case.
 384          */
 385         int (*x86_32_early_logical_apicid)(int cpu);
 386
 387         /*
 388          * Optional method called from setup_local_APIC() after logical
 389          * apicid is guaranteed to be known to initialize apicid -> node
 390          * mapping if NUMA initialization hasn't done so already.  Don't
 391          * add new users.
 392          */
 393         int (*x86_32_numa_cpu_node)(int cpu);
 394 #endif
 395 };
 396
 397 /*
 398  * Pointer to the local APIC driver in use on this system (there's
 399  * always just one such driver in use - the kernel decides via an
 400  * early probing process which one it picks - and then sticks to it):
 401  */
 402 extern struct apic *apic;
 403
 404 /*
 405  * APIC drivers are probed based on how they are listed in the .apicdrivers
 406  * section. So the order is important and enforced by the ordering
 407  * of different apic driver files in the Makefile.
 408  *
 409  * For the files having two apic drivers, we use apic_drivers()
 410  * to enforce the order with in them.
 411  */
 412 #define apic_driver(sym)                                        \
 413         static const struct apic *__apicdrivers_##sym __used            \
 414         __aligned(sizeof(struct apic *))                        \
 415         __section(.apicdrivers) = { &sym }
 416
 417 #define apic_drivers(sym1, sym2)                                        \
 418         static struct apic *__apicdrivers_##sym1##sym2[2] __used        \
 419         __aligned(sizeof(struct apic *))                                \
 420         __section(.apicdrivers) = { &sym1, &sym2 }
 421
 422 extern struct apic *__apicdrivers[], *__apicdrivers_end[];
 423
 424 /*
 425  * APIC functionality to boot other CPUs - only used on SMP:
 426  */
 427 #ifdef CONFIG_SMP
 428 extern atomic_t init_deasserted;
 429 extern int wakeup_secondary_cpu_via_nmi(int apicid, unsigned long start_eip);
 430 #endif
 431
 432 #ifdef CONFIG_X86_LOCAL_APIC
 433
 434 static inline u32 apic_read(u32 reg)
 435 {
 436         return apic->read(reg);
 437 }
 438
 439 static inline void apic_write(u32 reg, u32 val)
 440 {
 441         apic->write(reg, val);
 442 }
 443
 444 static inline void apic_eoi(void)
 445 {
 446         apic->eoi_write(APIC_EOI, APIC_EOI_ACK);
 447 }
 448
 449 static inline u64 apic_icr_read(void)
 450 {
 451         return apic->icr_read();
 452 }
 453
 454 static inline void apic_icr_write(u32 low, u32 high)
 455 {
 456         apic->icr_write(low, high);
 457 }
 458
 459 static inline void apic_wait_icr_idle(void)
 460 {
 461         apic->wait_icr_idle();
 462 }
 463
 464 static inline u32 safe_apic_wait_icr_idle(void)
 465 {
 466         return apic->safe_wait_icr_idle();
 467 }
 468
 469 extern void __init apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v));
 470
 471 #else /* CONFIG_X86_LOCAL_APIC */
 472
 473 static inline u32 apic_read(u32 reg) { return 0; }
 474 static inline void apic_write(u32 reg, u32 val) { }
 475 static inline void apic_eoi(void) { }
 476 static inline u64 apic_icr_read(void) { return 0; }
 477 static inline void apic_icr_write(u32 low, u32 high) { }
 478 static inline void apic_wait_icr_idle(void) { }
 479 static inline u32 safe_apic_wait_icr_idle(void) { return 0; }
 480 static inline void apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v)) {}
 481
 482 #endif /* CONFIG_X86_LOCAL_APIC */
 483
 484 static inline void ack_APIC_irq(void)
 485 {
 486         /*
 487          * ack_APIC_irq() actually gets compiled as a single instruction
 488          * ... yummie.
 489          */
 490         apic_eoi();
 491 }
 492
 493 static inline unsigned default_get_apic_id(unsigned long x)
 494 {
 495         unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR));
 496
 497         if (APIC_XAPIC(ver) || boot_cpu_has(X86_FEATURE_EXTD_APICID))
 498                 return (x >> 24) & 0xFF;
 499         else
 500                 return (x >> 24) & 0x0F;
 501 }
 502
 503 /*
 504  * Warm reset vector default position:
 505  */
 506 #define DEFAULT_TRAMPOLINE_PHYS_LOW             0x467
 507 #define DEFAULT_TRAMPOLINE_PHYS_HIGH            0x469
 508
 509 #ifdef CONFIG_X86_64
 510 extern int default_acpi_madt_oem_check(char *, char *);
 511
 512 extern void apic_send_IPI_self(int vector);
 513
 514 DECLARE_PER_CPU(int, x2apic_extra_bits);
 515
 516 extern int default_cpu_present_to_apicid(int mps_cpu);
 517 extern int default_check_phys_apicid_present(int phys_apicid);
 518 #endif
 519
 520 static inline void default_wait_for_init_deassert(atomic_t *deassert)
 521 {
 522         while (!atomic_read(deassert))
 523                 cpu_relax();
 524         return;
 525 }
 526
 527 extern void generic_bigsmp_probe(void);
 528
 529
 530 #ifdef CONFIG_X86_LOCAL_APIC
 531
 532 #include <asm/smp.h>
 533
 534 #define APIC_DFR_VALUE  (APIC_DFR_FLAT)
 535
 536 static inline const struct cpumask *default_target_cpus(void)
 537 {
 538 #ifdef CONFIG_SMP
 539         return cpu_online_mask;
 540 #else
 541         return cpumask_of(0);
 542 #endif
 543 }
 544
 545 static inline const struct cpumask *online_target_cpus(void)
 546 {
 547         return cpu_online_mask;
 548 }
 549
 550 DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid);
 551
 552
 553 static inline unsigned int read_apic_id(void)
 554 {
 555         unsigned int reg;
 556
 557         reg = apic_read(APIC_ID);
 558
 559         return apic->get_apic_id(reg);
 560 }
 561
 562 static inline int default_apic_id_valid(int apicid)
 563 {
 564         return (apicid < 255);
 565 }
 566
 567 extern void default_setup_apic_routing(void);
 568
 569 extern struct apic apic_noop;
 570
 571 #ifdef CONFIG_X86_32
 572
 573 static inline int noop_x86_32_early_logical_apicid(int cpu)
 574 {
 575         return BAD_APICID;
 576 }
 577
 578 /*
 579  * Set up the logical destination ID.
 580  *
 581  * Intel recommends to set DFR, LDR and TPR before enabling
 582  * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
 583  * document number 292116).  So here it goes...
 584  */
 585 extern void default_init_apic_ldr(void);
 586
 587 static inline int default_apic_id_registered(void)
 588 {
 589         return physid_isset(read_apic_id(), phys_cpu_present_map);
 590 }
 591
 592 static inline int default_phys_pkg_id(int cpuid_apic, int index_msb)
 593 {
 594         return cpuid_apic >> index_msb;
 595 }
 596
 597 #endif
 598
 599 static inline int
 600 flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 601                             const struct cpumask *andmask,
 602                             unsigned int *apicid)
 603 {
 604         unsigned long cpu_mask = cpumask_bits(cpumask)[0] &
 605                                  cpumask_bits(andmask)[0] &
 606                                  cpumask_bits(cpu_online_mask)[0] &
 607                                  APIC_ALL_CPUS;
 608
 609         if (likely(cpu_mask)) {
 610                 *apicid = (unsigned int)cpu_mask;
 611                 return 0;
 612         } else {
 613                 return -EINVAL;
 614         }
 615 }
 616
 617 extern int
 618 default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 619                                const struct cpumask *andmask,
 620                                unsigned int *apicid);
 621
 622 static inline void
 623 flat_vector_allocation_domain(int cpu, struct cpumask *retmask,
 624                               const struct cpumask *mask)
 625 {
 626         /* Careful. Some cpus do not strictly honor the set of cpus
 627          * specified in the interrupt destination when using lowest
 628          * priority interrupt delivery mode.
 629          *
 630          * In particular there was a hyperthreading cpu observed to
 631          * deliver interrupts to the wrong hyperthread when only one
 632          * hyperthread was specified in the interrupt desitination.
 633          */
 634         cpumask_clear(retmask);
 635         cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
 636 }
 637
 638 static inline void
 639 default_vector_allocation_domain(int cpu, struct cpumask *retmask,
 640                                  const struct cpumask *mask)
 641 {
 642         cpumask_copy(retmask, cpumask_of(cpu));
 643 }
 644
 645 static inline unsigned long default_check_apicid_used(physid_mask_t *map, int apicid)
 646 {
 647         return physid_isset(apicid, *map);
 648 }
 649
 650 static inline unsigned long default_check_apicid_present(int bit)
 651 {
 652         return physid_isset(bit, phys_cpu_present_map);
 653 }
 654
 655 static inline void default_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
 656 {
 657         *retmap = *phys_map;
 658 }
 659
 660 static inline int __default_cpu_present_to_apicid(int mps_cpu)
 661 {
 662         if (mps_cpu < nr_cpu_ids && cpu_present(mps_cpu))
 663                 return (int)per_cpu(x86_bios_cpu_apicid, mps_cpu);
 664         else
 665                 return BAD_APICID;
 666 }
 667
 668 static inline int
 669 __default_check_phys_apicid_present(int phys_apicid)
 670 {
 671         return physid_isset(phys_apicid, phys_cpu_present_map);
 672 }
 673
 674 #ifdef CONFIG_X86_32
 675 static inline int default_cpu_present_to_apicid(int mps_cpu)
 676 {
 677         return __default_cpu_present_to_apicid(mps_cpu);
 678 }
 679
 680 static inline int
 681 default_check_phys_apicid_present(int phys_apicid)
 682 {
 683         return __default_check_phys_apicid_present(phys_apicid);
 684 }
 685 #else
 686 extern int default_cpu_present_to_apicid(int mps_cpu);
 687 extern int default_check_phys_apicid_present(int phys_apicid);
 688 #endif
 689
 690 #endif /* CONFIG_X86_LOCAL_APIC */
 691 extern void irq_enter(void);
 692 extern void irq_exit(void);
 693
 694 static inline void entering_irq(void)
 695 {
 696         irq_enter();
 697         exit_idle();
 698 }
 699
 700 static inline void entering_ack_irq(void)
 701 {
 702         ack_APIC_irq();
 703         entering_irq();
 704 }
 705
 706 static inline void exiting_irq(void)
 707 {
 708         irq_exit();
 709 }
 710
 711 static inline void exiting_ack_irq(void)
 712 {
 713         irq_exit();
 714         /* Ack only at the end to avoid potential reentry */
 715         ack_APIC_irq();
 716 }
 717
 718 #endif /* _ASM_X86_APIC_H */