arch/ia64/kernel/irq_ia64.c

   1 /*
   2  * linux/arch/ia64/kernel/irq_ia64.c
   3  *
   4  * Copyright (C) 1998-2001 Hewlett-Packard Co
   5  *      Stephane Eranian <eranian@hpl.hp.com>
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  *
   8  *  6/10/99: Updated to bring in sync with x86 version to facilitate
   9  *           support for SMP and different interrupt controllers.
  10  *
  11  * 09/15/00 Goutham Rao <goutham.rao@intel.com> Implemented pci_irq_to_vector
  12  *                      PCI to vector allocation routine.
  13  * 04/14/2004 Ashok Raj <ashok.raj@intel.com>
  14  *                                              Added CPU Hotplug handling for IPF.
  15  */
  16
  17 #include <linux/module.h>
  18
  19 #include <linux/jiffies.h>
  20 #include <linux/errno.h>
  21 #include <linux/init.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/ioport.h>
  24 #include <linux/kernel_stat.h>
  25 #include <linux/ptrace.h>
  26 #include <linux/random.h>       /* for rand_initialize_irq() */
  27 #include <linux/signal.h>
  28 #include <linux/smp.h>
  29 #include <linux/threads.h>
  30 #include <linux/bitops.h>
  31 #include <linux/irq.h>
  32 #include <linux/ratelimit.h>
  33 #include <linux/acpi.h>
  34
  35 #include <asm/delay.h>
  36 #include <asm/intrinsics.h>
  37 #include <asm/io.h>
  38 #include <asm/hw_irq.h>
  39 #include <asm/machvec.h>
  40 #include <asm/pgtable.h>
  41 #include <asm/system.h>
  42 #include <asm/tlbflush.h>
  43
  44 #ifdef CONFIG_PERFMON
  45 # include <asm/perfmon.h>
  46 #endif
  47
  48 #define IRQ_DEBUG       0
  49
  50 #define IRQ_VECTOR_UNASSIGNED   (0)
  51
  52 #define IRQ_UNUSED              (0)
  53 #define IRQ_USED                (1)
  54 #define IRQ_RSVD                (2)
  55
  56 /* These can be overridden in platform_irq_init */
  57 int ia64_first_device_vector = IA64_DEF_FIRST_DEVICE_VECTOR;
  58 int ia64_last_device_vector = IA64_DEF_LAST_DEVICE_VECTOR;
  59
  60 /* default base addr of IPI table */
  61 void __iomem *ipi_base_addr = ((void __iomem *)
  62                                (__IA64_UNCACHED_OFFSET | IA64_IPI_DEFAULT_BASE_ADDR));
  63
  64 static cpumask_t vector_allocation_domain(int cpu);
  65
  66 /*
  67  * Legacy IRQ to IA-64 vector translation table.
  68  */
  69 __u8 isa_irq_to_vector_map[16] = {
  70         /* 8259 IRQ translation, first 16 entries */
  71         0x2f, 0x20, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x29,
  72         0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21
  73 };
  74 EXPORT_SYMBOL(isa_irq_to_vector_map);
  75
  76 DEFINE_SPINLOCK(vector_lock);
  77
  78 struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
  79         [0 ... NR_IRQS - 1] = {
  80                 .vector = IRQ_VECTOR_UNASSIGNED,
  81                 .domain = CPU_MASK_NONE
  82         }
  83 };
  84
  85 DEFINE_PER_CPU(int[IA64_NUM_VECTORS], vector_irq) = {
  86         [0 ... IA64_NUM_VECTORS - 1] = -1
  87 };
  88
  89 static cpumask_t vector_table[IA64_NUM_VECTORS] = {
  90         [0 ... IA64_NUM_VECTORS - 1] = CPU_MASK_NONE
  91 };
  92
  93 static int irq_status[NR_IRQS] = {
  94         [0 ... NR_IRQS -1] = IRQ_UNUSED
  95 };
  96
  97 int check_irq_used(int irq)
  98 {
  99         if (irq_status[irq] == IRQ_USED)
 100                 return 1;
 101
 102         return -1;
 103 }
 104
 105 static inline int find_unassigned_irq(void)
 106 {
 107         int irq;
 108
 109         for (irq = IA64_FIRST_DEVICE_VECTOR; irq < NR_IRQS; irq++)
 110                 if (irq_status[irq] == IRQ_UNUSED)
 111                         return irq;
 112         return -ENOSPC;
 113 }
 114
 115 static inline int find_unassigned_vector(cpumask_t domain)
 116 {
 117         cpumask_t mask;
 118         int pos, vector;
 119
 120         cpus_and(mask, domain, cpu_online_map);
 121         if (cpus_empty(mask))
 122                 return -EINVAL;
 123
 124         for (pos = 0; pos < IA64_NUM_DEVICE_VECTORS; pos++) {
 125                 vector = IA64_FIRST_DEVICE_VECTOR + pos;
 126                 cpus_and(mask, domain, vector_table[vector]);
 127                 if (!cpus_empty(mask))
 128                         continue;
 129                 return vector;
 130         }
 131         return -ENOSPC;
 132 }
 133
 134 static int __bind_irq_vector(int irq, int vector, cpumask_t domain)
 135 {
 136         cpumask_t mask;
 137         int cpu;
 138         struct irq_cfg *cfg = &irq_cfg[irq];
 139
 140         BUG_ON((unsigned)irq >= NR_IRQS);
 141         BUG_ON((unsigned)vector >= IA64_NUM_VECTORS);
 142
 143         cpus_and(mask, domain, cpu_online_map);
 144         if (cpus_empty(mask))
 145                 return -EINVAL;
 146         if ((cfg->vector == vector) && cpus_equal(cfg->domain, domain))
 147                 return 0;
 148         if (cfg->vector != IRQ_VECTOR_UNASSIGNED)
 149                 return -EBUSY;
 150         for_each_cpu_mask(cpu, mask)
 151                 per_cpu(vector_irq, cpu)[vector] = irq;
 152         cfg->vector = vector;
 153         cfg->domain = domain;
 154         irq_status[irq] = IRQ_USED;
 155         cpus_or(vector_table[vector], vector_table[vector], domain);
 156         return 0;
 157 }
 158
 159 int bind_irq_vector(int irq, int vector, cpumask_t domain)
 160 {
 161         unsigned long flags;
 162         int ret;
 163
 164         spin_lock_irqsave(&vector_lock, flags);
 165         ret = __bind_irq_vector(irq, vector, domain);
 166         spin_unlock_irqrestore(&vector_lock, flags);
 167         return ret;
 168 }
 169
 170 static void __clear_irq_vector(int irq)
 171 {
 172         int vector, cpu;
 173         cpumask_t mask;
 174         cpumask_t domain;
 175         struct irq_cfg *cfg = &irq_cfg[irq];
 176
 177         BUG_ON((unsigned)irq >= NR_IRQS);
 178         BUG_ON(cfg->vector == IRQ_VECTOR_UNASSIGNED);
 179         vector = cfg->vector;
 180         domain = cfg->domain;
 181         cpus_and(mask, cfg->domain, cpu_online_map);
 182         for_each_cpu_mask(cpu, mask)
 183                 per_cpu(vector_irq, cpu)[vector] = -1;
 184         cfg->vector = IRQ_VECTOR_UNASSIGNED;
 185         cfg->domain = CPU_MASK_NONE;
 186         irq_status[irq] = IRQ_UNUSED;
 187         cpus_andnot(vector_table[vector], vector_table[vector], domain);
 188 }
 189
 190 static void clear_irq_vector(int irq)
 191 {
 192         unsigned long flags;
 193
 194         spin_lock_irqsave(&vector_lock, flags);
 195         __clear_irq_vector(irq);
 196         spin_unlock_irqrestore(&vector_lock, flags);
 197 }
 198
 199 int
 200 ia64_native_assign_irq_vector (int irq)
 201 {
 202         unsigned long flags;
 203         int vector, cpu;
 204         cpumask_t domain = CPU_MASK_NONE;
 205
 206         vector = -ENOSPC;
 207
 208         spin_lock_irqsave(&vector_lock, flags);
 209         for_each_online_cpu(cpu) {
 210                 domain = vector_allocation_domain(cpu);
 211                 vector = find_unassigned_vector(domain);
 212                 if (vector >= 0)
 213                         break;
 214         }
 215         if (vector < 0)
 216                 goto out;
 217         if (irq == AUTO_ASSIGN)
 218                 irq = vector;
 219         BUG_ON(__bind_irq_vector(irq, vector, domain));
 220  out:
 221         spin_unlock_irqrestore(&vector_lock, flags);
 222         return vector;
 223 }
 224
 225 void
 226 ia64_native_free_irq_vector (int vector)
 227 {
 228         if (vector < IA64_FIRST_DEVICE_VECTOR ||
 229             vector > IA64_LAST_DEVICE_VECTOR)
 230                 return;
 231         clear_irq_vector(vector);
 232 }
 233
 234 int
 235 reserve_irq_vector (int vector)
 236 {
 237         if (vector < IA64_FIRST_DEVICE_VECTOR ||
 238             vector > IA64_LAST_DEVICE_VECTOR)
 239                 return -EINVAL;
 240         return !!bind_irq_vector(vector, vector, CPU_MASK_ALL);
 241 }
 242
 243 /*
 244  * Initialize vector_irq on a new cpu. This function must be called
 245  * with vector_lock held.
 246  */
 247 void __setup_vector_irq(int cpu)
 248 {
 249         int irq, vector;
 250
 251         /* Clear vector_irq */
 252         for (vector = 0; vector < IA64_NUM_VECTORS; ++vector)
 253                 per_cpu(vector_irq, cpu)[vector] = -1;
 254         /* Mark the inuse vectors */
 255         for (irq = 0; irq < NR_IRQS; ++irq) {
 256                 if (!cpu_isset(cpu, irq_cfg[irq].domain))
 257                         continue;
 258                 vector = irq_to_vector(irq);
 259                 per_cpu(vector_irq, cpu)[vector] = irq;
 260         }
 261 }
 262
 263 #if defined(CONFIG_SMP) && (defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG))
 264
 265 static enum vector_domain_type {
 266         VECTOR_DOMAIN_NONE,
 267         VECTOR_DOMAIN_PERCPU
 268 } vector_domain_type = VECTOR_DOMAIN_NONE;
 269
 270 static cpumask_t vector_allocation_domain(int cpu)
 271 {
 272         if (vector_domain_type == VECTOR_DOMAIN_PERCPU)
 273                 return cpumask_of_cpu(cpu);
 274         return CPU_MASK_ALL;
 275 }
 276
 277 static int __irq_prepare_move(int irq, int cpu)
 278 {
 279         struct irq_cfg *cfg = &irq_cfg[irq];
 280         int vector;
 281         cpumask_t domain;
 282
 283         if (cfg->move_in_progress || cfg->move_cleanup_count)
 284                 return -EBUSY;
 285         if (cfg->vector == IRQ_VECTOR_UNASSIGNED || !cpu_online(cpu))
 286                 return -EINVAL;
 287         if (cpu_isset(cpu, cfg->domain))
 288                 return 0;
 289         domain = vector_allocation_domain(cpu);
 290         vector = find_unassigned_vector(domain);
 291         if (vector < 0)
 292                 return -ENOSPC;
 293         cfg->move_in_progress = 1;
 294         cfg->old_domain = cfg->domain;
 295         cfg->vector = IRQ_VECTOR_UNASSIGNED;
 296         cfg->domain = CPU_MASK_NONE;
 297         BUG_ON(__bind_irq_vector(irq, vector, domain));
 298         return 0;
 299 }
 300
 301 int irq_prepare_move(int irq, int cpu)
 302 {
 303         unsigned long flags;
 304         int ret;
 305
 306         spin_lock_irqsave(&vector_lock, flags);
 307         ret = __irq_prepare_move(irq, cpu);
 308         spin_unlock_irqrestore(&vector_lock, flags);
 309         return ret;
 310 }
 311
 312 void irq_complete_move(unsigned irq)
 313 {
 314         struct irq_cfg *cfg = &irq_cfg[irq];
 315         cpumask_t cleanup_mask;
 316         int i;
 317
 318         if (likely(!cfg->move_in_progress))
 319                 return;
 320
 321         if (unlikely(cpu_isset(smp_processor_id(), cfg->old_domain)))
 322                 return;
 323
 324         cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
 325         cfg->move_cleanup_count = cpus_weight(cleanup_mask);
 326         for_each_cpu_mask(i, cleanup_mask)
 327                 platform_send_ipi(i, IA64_IRQ_MOVE_VECTOR, IA64_IPI_DM_INT, 0);
 328         cfg->move_in_progress = 0;
 329 }
 330
 331 static irqreturn_t smp_irq_move_cleanup_interrupt(int irq, void *dev_id)
 332 {
 333         int me = smp_processor_id();
 334         ia64_vector vector;
 335         unsigned long flags;
 336
 337         for (vector = IA64_FIRST_DEVICE_VECTOR;
 338              vector < IA64_LAST_DEVICE_VECTOR; vector++) {
 339                 int irq;
 340                 struct irq_desc *desc;
 341                 struct irq_cfg *cfg;
 342                 irq = __get_cpu_var(vector_irq)[vector];
 343                 if (irq < 0)
 344                         continue;
 345
 346                 desc = irq_to_desc(irq);
 347                 cfg = irq_cfg + irq;
 348                 raw_spin_lock(&desc->lock);
 349                 if (!cfg->move_cleanup_count)
 350                         goto unlock;
 351
 352                 if (!cpu_isset(me, cfg->old_domain))
 353                         goto unlock;
 354
 355                 spin_lock_irqsave(&vector_lock, flags);
 356                 __get_cpu_var(vector_irq)[vector] = -1;
 357                 cpu_clear(me, vector_table[vector]);
 358                 spin_unlock_irqrestore(&vector_lock, flags);
 359                 cfg->move_cleanup_count--;
 360         unlock:
 361                 raw_spin_unlock(&desc->lock);
 362         }
 363         return IRQ_HANDLED;
 364 }
 365
 366 static struct irqaction irq_move_irqaction = {
 367         .handler =      smp_irq_move_cleanup_interrupt,
 368         .flags =        IRQF_DISABLED,
 369         .name =         "irq_move"
 370 };
 371
 372 static int __init parse_vector_domain(char *arg)
 373 {
 374         if (!arg)
 375                 return -EINVAL;
 376         if (!strcmp(arg, "percpu")) {
 377                 vector_domain_type = VECTOR_DOMAIN_PERCPU;
 378                 no_int_routing = 1;
 379         }
 380         return 0;
 381 }
 382 early_param("vector", parse_vector_domain);
 383 #else
 384 static cpumask_t vector_allocation_domain(int cpu)
 385 {
 386         return CPU_MASK_ALL;
 387 }
 388 #endif
 389
 390
 391 void destroy_and_reserve_irq(unsigned int irq)
 392 {
 393         unsigned long flags;
 394
 395         dynamic_irq_cleanup(irq);
 396
 397         spin_lock_irqsave(&vector_lock, flags);
 398         __clear_irq_vector(irq);
 399         irq_status[irq] = IRQ_RSVD;
 400         spin_unlock_irqrestore(&vector_lock, flags);
 401 }
 402
 403 /*
 404  * Dynamic irq allocate and deallocation for MSI
 405  */
 406 int create_irq(void)
 407 {
 408         unsigned long flags;
 409         int irq, vector, cpu;
 410         cpumask_t domain = CPU_MASK_NONE;
 411
 412         irq = vector = -ENOSPC;
 413         spin_lock_irqsave(&vector_lock, flags);
 414         for_each_online_cpu(cpu) {
 415                 domain = vector_allocation_domain(cpu);
 416                 vector = find_unassigned_vector(domain);
 417                 if (vector >= 0)
 418                         break;
 419         }
 420         if (vector < 0)
 421                 goto out;
 422         irq = find_unassigned_irq();
 423         if (irq < 0)
 424                 goto out;
 425         BUG_ON(__bind_irq_vector(irq, vector, domain));
 426  out:
 427         spin_unlock_irqrestore(&vector_lock, flags);
 428         if (irq >= 0)
 429                 dynamic_irq_init(irq);
 430         return irq;
 431 }
 432
 433 void destroy_irq(unsigned int irq)
 434 {
 435         dynamic_irq_cleanup(irq);
 436         clear_irq_vector(irq);
 437 }
 438
 439 #ifdef CONFIG_SMP
 440 #       define IS_RESCHEDULE(vec)       (vec == IA64_IPI_RESCHEDULE)
 441 #       define IS_LOCAL_TLB_FLUSH(vec)  (vec == IA64_IPI_LOCAL_TLB_FLUSH)
 442 #else
 443 #       define IS_RESCHEDULE(vec)       (0)
 444 #       define IS_LOCAL_TLB_FLUSH(vec)  (0)
 445 #endif
 446 /*
 447  * That's where the IVT branches when we get an external
 448  * interrupt. This branches to the correct hardware IRQ handler via
 449  * function ptr.
 450  */
 451 void
 452 ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
 453 {
 454         struct pt_regs *old_regs = set_irq_regs(regs);
 455         unsigned long saved_tpr;
 456
 457 #if IRQ_DEBUG
 458         {
 459                 unsigned long bsp, sp;
 460
 461                 /*
 462                  * Note: if the interrupt happened while executing in
 463                  * the context switch routine (ia64_switch_to), we may
 464                  * get a spurious stack overflow here.  This is
 465                  * because the register and the memory stack are not
 466                  * switched atomically.
 467                  */
 468                 bsp = ia64_getreg(_IA64_REG_AR_BSP);
 469                 sp = ia64_getreg(_IA64_REG_SP);
 470
 471                 if ((sp - bsp) < 1024) {
 472                         static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
 473
 474                         if (__ratelimit(&ratelimit)) {
 475                                 printk("ia64_handle_irq: DANGER: less than "
 476                                        "1KB of free stack space!!\n"
 477                                        "(bsp=0x%lx, sp=%lx)\n", bsp, sp);
 478                         }
 479                 }
 480         }
 481 #endif /* IRQ_DEBUG */
 482
 483         /*
 484          * Always set TPR to limit maximum interrupt nesting depth to
 485          * 16 (without this, it would be ~240, which could easily lead
 486          * to kernel stack overflows).
 487          */
 488         irq_enter();
 489         saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
 490         ia64_srlz_d();
 491         while (vector != IA64_SPURIOUS_INT_VECTOR) {
 492                 int irq = local_vector_to_irq(vector);
 493                 struct irq_desc *desc = irq_to_desc(irq);
 494
 495                 if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
 496                         smp_local_flush_tlb();
 497                         kstat_incr_irqs_this_cpu(irq, desc);
 498                 } else if (unlikely(IS_RESCHEDULE(vector))) {
 499                         kstat_incr_irqs_this_cpu(irq, desc);
 500                 } else {
 501                         ia64_setreg(_IA64_REG_CR_TPR, vector);
 502                         ia64_srlz_d();
 503
 504                         if (unlikely(irq < 0)) {
 505                                 printk(KERN_ERR "%s: Unexpected interrupt "
 506                                        "vector %d on CPU %d is not mapped "
 507                                        "to any IRQ!\n", __func__, vector,
 508                                        smp_processor_id());
 509                         } else
 510                                 generic_handle_irq(irq);
 511
 512                         /*
 513                          * Disable interrupts and send EOI:
 514                          */
 515                         local_irq_disable();
 516                         ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
 517                 }
 518                 ia64_eoi();
 519                 vector = ia64_get_ivr();
 520         }
 521         /*
 522          * This must be done *after* the ia64_eoi().  For example, the keyboard softirq
 523          * handler needs to be able to wait for further keyboard interrupts, which can't
 524          * come through until ia64_eoi() has been done.
 525          */
 526         irq_exit();
 527         set_irq_regs(old_regs);
 528 }
 529
 530 #ifdef CONFIG_HOTPLUG_CPU
 531 /*
 532  * This function emulates a interrupt processing when a cpu is about to be
 533  * brought down.
 534  */
 535 void ia64_process_pending_intr(void)
 536 {
 537         ia64_vector vector;
 538         unsigned long saved_tpr;
 539         extern unsigned int vectors_in_migration[NR_IRQS];
 540
 541         vector = ia64_get_ivr();
 542
 543         irq_enter();
 544         saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
 545         ia64_srlz_d();
 546
 547          /*
 548           * Perform normal interrupt style processing
 549           */
 550         while (vector != IA64_SPURIOUS_INT_VECTOR) {
 551                 int irq = local_vector_to_irq(vector);
 552                 struct irq_desc *desc = irq_to_desc(irq);
 553
 554                 if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
 555                         smp_local_flush_tlb();
 556                         kstat_incr_irqs_this_cpu(irq, desc);
 557                 } else if (unlikely(IS_RESCHEDULE(vector))) {
 558                         kstat_incr_irqs_this_cpu(irq, desc);
 559                 } else {
 560                         struct pt_regs *old_regs = set_irq_regs(NULL);
 561
 562                         ia64_setreg(_IA64_REG_CR_TPR, vector);
 563                         ia64_srlz_d();
 564
 565                         /*
 566                          * Now try calling normal ia64_handle_irq as it would have got called
 567                          * from a real intr handler. Try passing null for pt_regs, hopefully
 568                          * it will work. I hope it works!.
 569                          * Probably could shared code.
 570                          */
 571                         if (unlikely(irq < 0)) {
 572                                 printk(KERN_ERR "%s: Unexpected interrupt "
 573                                        "vector %d on CPU %d not being mapped "
 574                                        "to any IRQ!!\n", __func__, vector,
 575                                        smp_processor_id());
 576                         } else {
 577                                 vectors_in_migration[irq]=0;
 578                                 generic_handle_irq(irq);
 579                         }
 580                         set_irq_regs(old_regs);
 581
 582                         /*
 583                          * Disable interrupts and send EOI
 584                          */
 585                         local_irq_disable();
 586                         ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
 587                 }
 588                 ia64_eoi();
 589                 vector = ia64_get_ivr();
 590         }
 591         irq_exit();
 592 }
 593 #endif
 594
 595
 596 #ifdef CONFIG_SMP
 597
 598 static irqreturn_t dummy_handler (int irq, void *dev_id)
 599 {
 600         BUG();
 601 }
 602
 603 static struct irqaction ipi_irqaction = {
 604         .handler =      handle_IPI,
 605         .flags =        IRQF_DISABLED,
 606         .name =         "IPI"
 607 };
 608
 609 /*
 610  * KVM uses this interrupt to force a cpu out of guest mode
 611  */
 612 static struct irqaction resched_irqaction = {
 613         .handler =      dummy_handler,
 614         .flags =        IRQF_DISABLED,
 615         .name =         "resched"
 616 };
 617
 618 static struct irqaction tlb_irqaction = {
 619         .handler =      dummy_handler,
 620         .flags =        IRQF_DISABLED,
 621         .name =         "tlb_flush"
 622 };
 623
 624 #endif
 625
 626 void
 627 ia64_native_register_percpu_irq (ia64_vector vec, struct irqaction *action)
 628 {
 629         unsigned int irq;
 630
 631         irq = vec;
 632         BUG_ON(bind_irq_vector(irq, vec, CPU_MASK_ALL));
 633         irq_set_status_flags(irq, IRQ_PER_CPU);
 634         irq_set_chip(irq, &irq_type_ia64_lsapic);
 635         if (action)
 636                 setup_irq(irq, action);
 637         irq_set_handler(irq, handle_percpu_irq);
 638 }
 639
 640 void __init
 641 ia64_native_register_ipi(void)
 642 {
 643 #ifdef CONFIG_SMP
 644         register_percpu_irq(IA64_IPI_VECTOR, &ipi_irqaction);
 645         register_percpu_irq(IA64_IPI_RESCHEDULE, &resched_irqaction);
 646         register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &tlb_irqaction);
 647 #endif
 648 }
 649
 650 void __init
 651 init_IRQ (void)
 652 {
 653 #ifdef CONFIG_ACPI
 654         acpi_boot_init();
 655 #endif
 656         ia64_register_ipi();
 657         register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL);
 658 #ifdef CONFIG_SMP
 659 #if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG)
 660         if (vector_domain_type != VECTOR_DOMAIN_NONE)
 661                 register_percpu_irq(IA64_IRQ_MOVE_VECTOR, &irq_move_irqaction);
 662 #endif
 663 #endif
 664 #ifdef CONFIG_PERFMON
 665         pfm_init_percpu();
 666 #endif
 667         platform_irq_init();
 668 }
 669
 670 void
 671 ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect)
 672 {
 673         void __iomem *ipi_addr;
 674         unsigned long ipi_data;
 675         unsigned long phys_cpu_id;
 676
 677         phys_cpu_id = cpu_physical_id(cpu);
 678
 679         /*
 680          * cpu number is in 8bit ID and 8bit EID
 681          */
 682
 683         ipi_data = (delivery_mode << 8) | (vector & 0xff);
 684         ipi_addr = ipi_base_addr + ((phys_cpu_id << 4) | ((redirect & 1) << 3));
 685
 686         writeq(ipi_data, ipi_addr);
 687 }