arch/x86_64/kernel/io_apic.c

   1 /*
   2  *      Intel IO-APIC support for multi-Pentium hosts.
   3  *
   4  *      Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo
   5  *
   6  *      Many thanks to Stig Venaas for trying out countless experimental
   7  *      patches and reporting/debugging problems patiently!
   8  *
   9  *      (c) 1999, Multiple IO-APIC support, developed by
  10  *      Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
  11  *      Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
  12  *      further tested and cleaned up by Zach Brown <zab@redhat.com>
  13  *      and Ingo Molnar <mingo@redhat.com>
  14  *
  15  *      Fixes
  16  *      Maciej W. Rozycki       :       Bits for genuine 82489DX APICs;
  17  *                                      thanks to Eric Gilmore
  18  *                                      and Rolf G. Tews
  19  *                                      for testing these extensively
  20  *      Paul Diefenbaugh        :       Added full ACPI support
  21  */
  22
  23 #include <linux/mm.h>
  24 #include <linux/irq.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/init.h>
  27 #include <linux/delay.h>
  28 #include <linux/sched.h>
  29 #include <linux/config.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/mc146818rtc.h>
  32 #include <linux/acpi.h>
  33 #include <linux/sysdev.h>
  34
  35 #include <asm/io.h>
  36 #include <asm/smp.h>
  37 #include <asm/desc.h>
  38 #include <asm/proto.h>
  39 #include <asm/mach_apic.h>
  40
  41 #define __apicdebuginit  __init
  42
  43 int sis_apic_bug; /* not actually supported, dummy for compile */
  44
  45 static DEFINE_SPINLOCK(ioapic_lock);
  46
  47 /*
  48  * # of IRQ routing registers
  49  */
  50 int nr_ioapic_registers[MAX_IO_APICS];
  51
  52 /*
  53  * Rough estimation of how many shared IRQs there are, can
  54  * be changed anytime.
  55  */
  56 #define MAX_PLUS_SHARED_IRQS NR_IRQS
  57 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
  58
  59 /*
  60  * This is performance-critical, we want to do it O(1)
  61  *
  62  * the indexing order of this array favors 1:1 mappings
  63  * between pins and IRQs.
  64  */
  65
  66 static struct irq_pin_list {
  67         short apic, pin, next;
  68 } irq_2_pin[PIN_MAP_SIZE];
  69
  70 int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1};
  71 #ifdef CONFIG_PCI_MSI
  72 #define vector_to_irq(vector)   \
  73         (platform_legacy_irq(vector) ? vector : vector_irq[vector])
  74 #else
  75 #define vector_to_irq(vector)   (vector)
  76 #endif
  77
  78 /*
  79  * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
  80  * shared ISA-space IRQs, so we have to support them. We are super
  81  * fast in the common case, and fast for shared ISA-space IRQs.
  82  */
  83 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
  84 {
  85         static int first_free_entry = NR_IRQS;
  86         struct irq_pin_list *entry = irq_2_pin + irq;
  87
  88         while (entry->next)
  89                 entry = irq_2_pin + entry->next;
  90
  91         if (entry->pin != -1) {
  92                 entry->next = first_free_entry;
  93                 entry = irq_2_pin + entry->next;
  94                 if (++first_free_entry >= PIN_MAP_SIZE)
  95                         panic("io_apic.c: whoops");
  96         }
  97         entry->apic = apic;
  98         entry->pin = pin;
  99 }
 100
 101 #define __DO_ACTION(R, ACTION, FINAL)                                   \
 102                                                                         \
 103 {                                                                       \
 104         int pin;                                                        \
 105         struct irq_pin_list *entry = irq_2_pin + irq;                   \
 106                                                                         \
 107         for (;;) {                                                      \
 108                 unsigned int reg;                                       \
 109                 pin = entry->pin;                                       \
 110                 if (pin == -1)                                          \
 111                         break;                                          \
 112                 reg = io_apic_read(entry->apic, 0x10 + R + pin*2);      \
 113                 reg ACTION;                                             \
 114                 io_apic_modify(entry->apic, reg);                       \
 115                 if (!entry->next)                                       \
 116                         break;                                          \
 117                 entry = irq_2_pin + entry->next;                        \
 118         }                                                               \
 119         FINAL;                                                          \
 120 }
 121
 122 #define DO_ACTION(name,R,ACTION, FINAL)                                 \
 123                                                                         \
 124         static void name##_IO_APIC_irq (unsigned int irq)               \
 125         __DO_ACTION(R, ACTION, FINAL)
 126
 127 DO_ACTION( __mask,             0, |= 0x00010000, io_apic_sync(entry->apic) )
 128                                                 /* mask = 1 */
 129 DO_ACTION( __unmask,           0, &= 0xfffeffff, )
 130                                                 /* mask = 0 */
 131
 132 static void mask_IO_APIC_irq (unsigned int irq)
 133 {
 134         unsigned long flags;
 135
 136         spin_lock_irqsave(&ioapic_lock, flags);
 137         __mask_IO_APIC_irq(irq);
 138         spin_unlock_irqrestore(&ioapic_lock, flags);
 139 }
 140
 141 static void unmask_IO_APIC_irq (unsigned int irq)
 142 {
 143         unsigned long flags;
 144
 145         spin_lock_irqsave(&ioapic_lock, flags);
 146         __unmask_IO_APIC_irq(irq);
 147         spin_unlock_irqrestore(&ioapic_lock, flags);
 148 }
 149
 150 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
 151 {
 152         struct IO_APIC_route_entry entry;
 153         unsigned long flags;
 154
 155         /* Check delivery_mode to be sure we're not clearing an SMI pin */
 156         spin_lock_irqsave(&ioapic_lock, flags);
 157         *(((int*)&entry) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
 158         *(((int*)&entry) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
 159         spin_unlock_irqrestore(&ioapic_lock, flags);
 160         if (entry.delivery_mode == dest_SMI)
 161                 return;
 162         /*
 163          * Disable it in the IO-APIC irq-routing table:
 164          */
 165         memset(&entry, 0, sizeof(entry));
 166         entry.mask = 1;
 167         spin_lock_irqsave(&ioapic_lock, flags);
 168         io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry) + 0));
 169         io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry) + 1));
 170         spin_unlock_irqrestore(&ioapic_lock, flags);
 171 }
 172
 173 static void clear_IO_APIC (void)
 174 {
 175         int apic, pin;
 176
 177         for (apic = 0; apic < nr_ioapics; apic++)
 178                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
 179                         clear_IO_APIC_pin(apic, pin);
 180 }
 181
 182 /*
 183  * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
 184  * specific CPU-side IRQs.
 185  */
 186
 187 #define MAX_PIRQS 8
 188 static int pirq_entries [MAX_PIRQS];
 189 static int pirqs_enabled;
 190 int skip_ioapic_setup;
 191 int ioapic_force;
 192
 193 /* dummy parsing: see setup.c */
 194
 195 static int __init disable_ioapic_setup(char *str)
 196 {
 197         skip_ioapic_setup = 1;
 198         return 1;
 199 }
 200
 201 static int __init enable_ioapic_setup(char *str)
 202 {
 203         ioapic_force = 1;
 204         skip_ioapic_setup = 0;
 205         return 1;
 206 }
 207
 208 __setup("noapic", disable_ioapic_setup);
 209 __setup("apic", enable_ioapic_setup);
 210
 211 #include <asm/pci-direct.h>
 212 #include <linux/pci_ids.h>
 213 #include <linux/pci.h>
 214
 215 /* Temporary Hack. Nvidia and VIA boards currently only work with IO-APIC
 216    off. Check for an Nvidia or VIA PCI bridge and turn it off.
 217    Use pci direct infrastructure because this runs before the PCI subsystem.
 218
 219    Can be overwritten with "apic"
 220
 221    And another hack to disable the IOMMU on VIA chipsets.
 222
 223    Kludge-O-Rama. */
 224 void __init check_ioapic(void)
 225 {
 226         int num,slot,func;
 227         if (ioapic_force)
 228                 return;
 229
 230         /* Poor man's PCI discovery */
 231         for (num = 0; num < 32; num++) {
 232                 for (slot = 0; slot < 32; slot++) {
 233                         for (func = 0; func < 8; func++) {
 234                                 u32 class;
 235                                 u32 vendor;
 236                                 u8 type;
 237                                 class = read_pci_config(num,slot,func,
 238                                                         PCI_CLASS_REVISION);
 239                                 if (class == 0xffffffff)
 240                                         break;
 241
 242                                 if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
 243                                         continue;
 244
 245                                 vendor = read_pci_config(num, slot, func,
 246                                                          PCI_VENDOR_ID);
 247                                 vendor &= 0xffff;
 248                                 switch (vendor) {
 249                                 case PCI_VENDOR_ID_VIA:
 250 #ifdef CONFIG_GART_IOMMU
 251                                         if ((end_pfn >= (0xffffffff>>PAGE_SHIFT) ||
 252                                              force_iommu) &&
 253                                             !iommu_aperture_allowed) {
 254                                                 printk(KERN_INFO
 255     "Looks like a VIA chipset. Disabling IOMMU. Overwrite with \"iommu=allowed\"\n");
 256                                                 iommu_aperture_disabled = 1;
 257                                         }
 258 #endif
 259                                         return;
 260                                 case PCI_VENDOR_ID_NVIDIA:
 261 #ifdef CONFIG_ACPI
 262                                         /* All timer overrides on Nvidia
 263                                            seem to be wrong. Skip them. */
 264                                         acpi_skip_timer_override = 1;
 265                                         printk(KERN_INFO
 266              "Nvidia board detected. Ignoring ACPI timer override.\n");
 267 #endif
 268                                         /* RED-PEN skip them on mptables too? */
 269                                         return;
 270                                 }
 271
 272                                 /* No multi-function device? */
 273                                 type = read_pci_config_byte(num,slot,func,
 274                                                             PCI_HEADER_TYPE);
 275                                 if (!(type & 0x80))
 276                                         break;
 277                         }
 278                 }
 279         }
 280 }
 281
 282 static int __init ioapic_pirq_setup(char *str)
 283 {
 284         int i, max;
 285         int ints[MAX_PIRQS+1];
 286
 287         get_options(str, ARRAY_SIZE(ints), ints);
 288
 289         for (i = 0; i < MAX_PIRQS; i++)
 290                 pirq_entries[i] = -1;
 291
 292         pirqs_enabled = 1;
 293         apic_printk(APIC_VERBOSE, "PIRQ redirection, working around broken MP-BIOS.\n");
 294         max = MAX_PIRQS;
 295         if (ints[0] < MAX_PIRQS)
 296                 max = ints[0];
 297
 298         for (i = 0; i < max; i++) {
 299                 apic_printk(APIC_VERBOSE, "... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
 300                 /*
 301                  * PIRQs are mapped upside down, usually.
 302                  */
 303                 pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
 304         }
 305         return 1;
 306 }
 307
 308 __setup("pirq=", ioapic_pirq_setup);
 309
 310 /*
 311  * Find the IRQ entry number of a certain pin.
 312  */
 313 static int find_irq_entry(int apic, int pin, int type)
 314 {
 315         int i;
 316
 317         for (i = 0; i < mp_irq_entries; i++)
 318                 if (mp_irqs[i].mpc_irqtype == type &&
 319                     (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
 320                      mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
 321                     mp_irqs[i].mpc_dstirq == pin)
 322                         return i;
 323
 324         return -1;
 325 }
 326
 327 /*
 328  * Find the pin to which IRQ[irq] (ISA) is connected
 329  */
 330 static int __init find_isa_irq_pin(int irq, int type)
 331 {
 332         int i;
 333
 334         for (i = 0; i < mp_irq_entries; i++) {
 335                 int lbus = mp_irqs[i].mpc_srcbus;
 336
 337                 if ((mp_bus_id_to_type[lbus] == MP_BUS_ISA ||
 338                      mp_bus_id_to_type[lbus] == MP_BUS_EISA ||
 339                      mp_bus_id_to_type[lbus] == MP_BUS_MCA) &&
 340                     (mp_irqs[i].mpc_irqtype == type) &&
 341                     (mp_irqs[i].mpc_srcbusirq == irq))
 342
 343                         return mp_irqs[i].mpc_dstirq;
 344         }
 345         return -1;
 346 }
 347
 348 /*
 349  * Find a specific PCI IRQ entry.
 350  * Not an __init, possibly needed by modules
 351  */
 352 static int pin_2_irq(int idx, int apic, int pin);
 353
 354 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
 355 {
 356         int apic, i, best_guess = -1;
 357
 358         apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
 359                 bus, slot, pin);
 360         if (mp_bus_id_to_pci_bus[bus] == -1) {
 361                 apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
 362                 return -1;
 363         }
 364         for (i = 0; i < mp_irq_entries; i++) {
 365                 int lbus = mp_irqs[i].mpc_srcbus;
 366
 367                 for (apic = 0; apic < nr_ioapics; apic++)
 368                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
 369                             mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
 370                                 break;
 371
 372                 if ((mp_bus_id_to_type[lbus] == MP_BUS_PCI) &&
 373                     !mp_irqs[i].mpc_irqtype &&
 374                     (bus == lbus) &&
 375                     (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
 376                         int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
 377
 378                         if (!(apic || IO_APIC_IRQ(irq)))
 379                                 continue;
 380
 381                         if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
 382                                 return irq;
 383                         /*
 384                          * Use the first all-but-pin matching entry as a
 385                          * best-guess fuzzy result for broken mptables.
 386                          */
 387                         if (best_guess < 0)
 388                                 best_guess = irq;
 389                 }
 390         }
 391         return best_guess;
 392 }
 393
 394 /*
 395  * EISA Edge/Level control register, ELCR
 396  */
 397 static int EISA_ELCR(unsigned int irq)
 398 {
 399         if (irq < 16) {
 400                 unsigned int port = 0x4d0 + (irq >> 3);
 401                 return (inb(port) >> (irq & 7)) & 1;
 402         }
 403         apic_printk(APIC_VERBOSE, "Broken MPtable reports ISA irq %d\n", irq);
 404         return 0;
 405 }
 406
 407 /* EISA interrupts are always polarity zero and can be edge or level
 408  * trigger depending on the ELCR value.  If an interrupt is listed as
 409  * EISA conforming in the MP table, that means its trigger type must
 410  * be read in from the ELCR */
 411
 412 #define default_EISA_trigger(idx)       (EISA_ELCR(mp_irqs[idx].mpc_srcbusirq))
 413 #define default_EISA_polarity(idx)      (0)
 414
 415 /* ISA interrupts are always polarity zero edge triggered,
 416  * when listed as conforming in the MP table. */
 417
 418 #define default_ISA_trigger(idx)        (0)
 419 #define default_ISA_polarity(idx)       (0)
 420
 421 /* PCI interrupts are always polarity one level triggered,
 422  * when listed as conforming in the MP table. */
 423
 424 #define default_PCI_trigger(idx)        (1)
 425 #define default_PCI_polarity(idx)       (1)
 426
 427 /* MCA interrupts are always polarity zero level triggered,
 428  * when listed as conforming in the MP table. */
 429
 430 #define default_MCA_trigger(idx)        (1)
 431 #define default_MCA_polarity(idx)       (0)
 432
 433 static int __init MPBIOS_polarity(int idx)
 434 {
 435         int bus = mp_irqs[idx].mpc_srcbus;
 436         int polarity;
 437
 438         /*
 439          * Determine IRQ line polarity (high active or low active):
 440          */
 441         switch (mp_irqs[idx].mpc_irqflag & 3)
 442         {
 443                 case 0: /* conforms, ie. bus-type dependent polarity */
 444                 {
 445                         switch (mp_bus_id_to_type[bus])
 446                         {
 447                                 case MP_BUS_ISA: /* ISA pin */
 448                                 {
 449                                         polarity = default_ISA_polarity(idx);
 450                                         break;
 451                                 }
 452                                 case MP_BUS_EISA: /* EISA pin */
 453                                 {
 454                                         polarity = default_EISA_polarity(idx);
 455                                         break;
 456                                 }
 457                                 case MP_BUS_PCI: /* PCI pin */
 458                                 {
 459                                         polarity = default_PCI_polarity(idx);
 460                                         break;
 461                                 }
 462                                 case MP_BUS_MCA: /* MCA pin */
 463                                 {
 464                                         polarity = default_MCA_polarity(idx);
 465                                         break;
 466                                 }
 467                                 default:
 468                                 {
 469                                         printk(KERN_WARNING "broken BIOS!!\n");
 470                                         polarity = 1;
 471                                         break;
 472                                 }
 473                         }
 474                         break;
 475                 }
 476                 case 1: /* high active */
 477                 {
 478                         polarity = 0;
 479                         break;
 480                 }
 481                 case 2: /* reserved */
 482                 {
 483                         printk(KERN_WARNING "broken BIOS!!\n");
 484                         polarity = 1;
 485                         break;
 486                 }
 487                 case 3: /* low active */
 488                 {
 489                         polarity = 1;
 490                         break;
 491                 }
 492                 default: /* invalid */
 493                 {
 494                         printk(KERN_WARNING "broken BIOS!!\n");
 495                         polarity = 1;
 496                         break;
 497                 }
 498         }
 499         return polarity;
 500 }
 501
 502 static int MPBIOS_trigger(int idx)
 503 {
 504         int bus = mp_irqs[idx].mpc_srcbus;
 505         int trigger;
 506
 507         /*
 508          * Determine IRQ trigger mode (edge or level sensitive):
 509          */
 510         switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
 511         {
 512                 case 0: /* conforms, ie. bus-type dependent */
 513                 {
 514                         switch (mp_bus_id_to_type[bus])
 515                         {
 516                                 case MP_BUS_ISA: /* ISA pin */
 517                                 {
 518                                         trigger = default_ISA_trigger(idx);
 519                                         break;
 520                                 }
 521                                 case MP_BUS_EISA: /* EISA pin */
 522                                 {
 523                                         trigger = default_EISA_trigger(idx);
 524                                         break;
 525                                 }
 526                                 case MP_BUS_PCI: /* PCI pin */
 527                                 {
 528                                         trigger = default_PCI_trigger(idx);
 529                                         break;
 530                                 }
 531                                 case MP_BUS_MCA: /* MCA pin */
 532                                 {
 533                                         trigger = default_MCA_trigger(idx);
 534                                         break;
 535                                 }
 536                                 default:
 537                                 {
 538                                         printk(KERN_WARNING "broken BIOS!!\n");
 539                                         trigger = 1;
 540                                         break;
 541                                 }
 542                         }
 543                         break;
 544                 }
 545                 case 1: /* edge */
 546                 {
 547                         trigger = 0;
 548                         break;
 549                 }
 550                 case 2: /* reserved */
 551                 {
 552                         printk(KERN_WARNING "broken BIOS!!\n");
 553                         trigger = 1;
 554                         break;
 555                 }
 556                 case 3: /* level */
 557                 {
 558                         trigger = 1;
 559                         break;
 560                 }
 561                 default: /* invalid */
 562                 {
 563                         printk(KERN_WARNING "broken BIOS!!\n");
 564                         trigger = 0;
 565                         break;
 566                 }
 567         }
 568         return trigger;
 569 }
 570
 571 static inline int irq_polarity(int idx)
 572 {
 573         return MPBIOS_polarity(idx);
 574 }
 575
 576 static inline int irq_trigger(int idx)
 577 {
 578         return MPBIOS_trigger(idx);
 579 }
 580
 581 static int pin_2_irq(int idx, int apic, int pin)
 582 {
 583         int irq, i;
 584         int bus = mp_irqs[idx].mpc_srcbus;
 585
 586         /*
 587          * Debugging check, we are in big trouble if this message pops up!
 588          */
 589         if (mp_irqs[idx].mpc_dstirq != pin)
 590                 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
 591
 592         switch (mp_bus_id_to_type[bus])
 593         {
 594                 case MP_BUS_ISA: /* ISA pin */
 595                 case MP_BUS_EISA:
 596                 case MP_BUS_MCA:
 597                 {
 598                         irq = mp_irqs[idx].mpc_srcbusirq;
 599                         break;
 600                 }
 601                 case MP_BUS_PCI: /* PCI pin */
 602                 {
 603                         /*
 604                          * PCI IRQs are mapped in order
 605                          */
 606                         i = irq = 0;
 607                         while (i < apic)
 608                                 irq += nr_ioapic_registers[i++];
 609                         irq += pin;
 610                         break;
 611                 }
 612                 default:
 613                 {
 614                         printk(KERN_ERR "unknown bus type %d.\n",bus);
 615                         irq = 0;
 616                         break;
 617                 }
 618         }
 619
 620         /*
 621          * PCI IRQ command line redirection. Yes, limits are hardcoded.
 622          */
 623         if ((pin >= 16) && (pin <= 23)) {
 624                 if (pirq_entries[pin-16] != -1) {
 625                         if (!pirq_entries[pin-16]) {
 626                                 apic_printk(APIC_VERBOSE, "disabling PIRQ%d\n", pin-16);
 627                         } else {
 628                                 irq = pirq_entries[pin-16];
 629                                 apic_printk(APIC_VERBOSE, "using PIRQ%d -> IRQ %d\n",
 630                                                 pin-16, irq);
 631                         }
 632                 }
 633         }
 634         return irq;
 635 }
 636
 637 static inline int IO_APIC_irq_trigger(int irq)
 638 {
 639         int apic, idx, pin;
 640
 641         for (apic = 0; apic < nr_ioapics; apic++) {
 642                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
 643                         idx = find_irq_entry(apic,pin,mp_INT);
 644                         if ((idx != -1) && (irq == pin_2_irq(idx,apic,pin)))
 645                                 return irq_trigger(idx);
 646                 }
 647         }
 648         /*
 649          * nonexistent IRQs are edge default
 650          */
 651         return 0;
 652 }
 653
 654 /* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */
 655 u8 irq_vector[NR_IRQ_VECTORS] = { FIRST_DEVICE_VECTOR , 0 };
 656
 657 int assign_irq_vector(int irq)
 658 {
 659         static int current_vector = FIRST_DEVICE_VECTOR, offset = 0;
 660
 661         BUG_ON(irq >= NR_IRQ_VECTORS);
 662         if (IO_APIC_VECTOR(irq) > 0)
 663                 return IO_APIC_VECTOR(irq);
 664 next:
 665         current_vector += 8;
 666         if (current_vector == IA32_SYSCALL_VECTOR)
 667                 goto next;
 668
 669         if (current_vector >= FIRST_SYSTEM_VECTOR) {
 670                 offset++;
 671                 if (!(offset%8))
 672                         return -ENOSPC;
 673                 current_vector = FIRST_DEVICE_VECTOR + offset;
 674         }
 675
 676         vector_irq[current_vector] = irq;
 677         if (irq != AUTO_ASSIGN)
 678                 IO_APIC_VECTOR(irq) = current_vector;
 679
 680         return current_vector;
 681 }
 682
 683 extern void (*interrupt[NR_IRQS])(void);
 684 static struct hw_interrupt_type ioapic_level_type;
 685 static struct hw_interrupt_type ioapic_edge_type;
 686
 687 #define IOAPIC_AUTO     -1
 688 #define IOAPIC_EDGE     0
 689 #define IOAPIC_LEVEL    1
 690
 691 static inline void ioapic_register_intr(int irq, int vector, unsigned long trigger)
 692 {
 693         if (use_pci_vector() && !platform_legacy_irq(irq)) {
 694                 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
 695                                 trigger == IOAPIC_LEVEL)
 696                         irq_desc[vector].handler = &ioapic_level_type;
 697                 else
 698                         irq_desc[vector].handler = &ioapic_edge_type;
 699                 set_intr_gate(vector, interrupt[vector]);
 700         } else  {
 701                 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
 702                                 trigger == IOAPIC_LEVEL)
 703                         irq_desc[irq].handler = &ioapic_level_type;
 704                 else
 705                         irq_desc[irq].handler = &ioapic_edge_type;
 706                 set_intr_gate(vector, interrupt[irq]);
 707         }
 708 }
 709
 710 static void __init setup_IO_APIC_irqs(void)
 711 {
 712         struct IO_APIC_route_entry entry;
 713         int apic, pin, idx, irq, first_notcon = 1, vector;
 714         unsigned long flags;
 715
 716         apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
 717
 718         for (apic = 0; apic < nr_ioapics; apic++) {
 719         for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
 720
 721                 /*
 722                  * add it to the IO-APIC irq-routing table:
 723                  */
 724                 memset(&entry,0,sizeof(entry));
 725
 726                 entry.delivery_mode = INT_DELIVERY_MODE;
 727                 entry.dest_mode = INT_DEST_MODE;
 728                 entry.mask = 0;                         /* enable IRQ */
 729                 entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
 730
 731                 idx = find_irq_entry(apic,pin,mp_INT);
 732                 if (idx == -1) {
 733                         if (first_notcon) {
 734                                 apic_printk(APIC_VERBOSE, KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mpc_apicid, pin);
 735                                 first_notcon = 0;
 736                         } else
 737                                 apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mpc_apicid, pin);
 738                         continue;
 739                 }
 740
 741                 entry.trigger = irq_trigger(idx);
 742                 entry.polarity = irq_polarity(idx);
 743
 744                 if (irq_trigger(idx)) {
 745                         entry.trigger = 1;
 746                         entry.mask = 1;
 747                         entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
 748                 }
 749
 750                 irq = pin_2_irq(idx, apic, pin);
 751                 add_pin_to_irq(irq, apic, pin);
 752
 753                 if (!apic && !IO_APIC_IRQ(irq))
 754                         continue;
 755
 756                 if (IO_APIC_IRQ(irq)) {
 757                         vector = assign_irq_vector(irq);
 758                         entry.vector = vector;
 759
 760                         ioapic_register_intr(irq, vector, IOAPIC_AUTO);
 761                         if (!apic && (irq < 16))
 762                                 disable_8259A_irq(irq);
 763                 }
 764                 spin_lock_irqsave(&ioapic_lock, flags);
 765                 io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
 766                 io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
 767                 spin_unlock_irqrestore(&ioapic_lock, flags);
 768         }
 769         }
 770
 771         if (!first_notcon)
 772                 apic_printk(APIC_VERBOSE," not connected.\n");
 773 }
 774
 775 /*
 776  * Set up the 8259A-master output pin as broadcast to all
 777  * CPUs.
 778  */
 779 static void __init setup_ExtINT_IRQ0_pin(unsigned int pin, int vector)
 780 {
 781         struct IO_APIC_route_entry entry;
 782         unsigned long flags;
 783
 784         memset(&entry,0,sizeof(entry));
 785
 786         disable_8259A_irq(0);
 787
 788         /* mask LVT0 */
 789         apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
 790
 791         /*
 792          * We use logical delivery to get the timer IRQ
 793          * to the first CPU.
 794          */
 795         entry.dest_mode = INT_DEST_MODE;
 796         entry.mask = 0;                                 /* unmask IRQ now */
 797         entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
 798         entry.delivery_mode = INT_DELIVERY_MODE;
 799         entry.polarity = 0;
 800         entry.trigger = 0;
 801         entry.vector = vector;
 802
 803         /*
 804          * The timer IRQ doesn't have to know that behind the
 805          * scene we have a 8259A-master in AEOI mode ...
 806          */
 807         irq_desc[0].handler = &ioapic_edge_type;
 808
 809         /*
 810          * Add it to the IO-APIC irq-routing table:
 811          */
 812         spin_lock_irqsave(&ioapic_lock, flags);
 813         io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1));
 814         io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0));
 815         spin_unlock_irqrestore(&ioapic_lock, flags);
 816
 817         enable_8259A_irq(0);
 818 }
 819
 820 void __init UNEXPECTED_IO_APIC(void)
 821 {
 822 }
 823
 824 void __apicdebuginit print_IO_APIC(void)
 825 {
 826         int apic, i;
 827         union IO_APIC_reg_00 reg_00;
 828         union IO_APIC_reg_01 reg_01;
 829         union IO_APIC_reg_02 reg_02;
 830         unsigned long flags;
 831
 832         if (apic_verbosity == APIC_QUIET)
 833                 return;
 834
 835         printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
 836         for (i = 0; i < nr_ioapics; i++)
 837                 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
 838                        mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
 839
 840         /*
 841          * We are a bit conservative about what we expect.  We have to
 842          * know about every hardware change ASAP.
 843          */
 844         printk(KERN_INFO "testing the IO APIC.......................\n");
 845
 846         for (apic = 0; apic < nr_ioapics; apic++) {
 847
 848         spin_lock_irqsave(&ioapic_lock, flags);
 849         reg_00.raw = io_apic_read(apic, 0);
 850         reg_01.raw = io_apic_read(apic, 1);
 851         if (reg_01.bits.version >= 0x10)
 852                 reg_02.raw = io_apic_read(apic, 2);
 853         spin_unlock_irqrestore(&ioapic_lock, flags);
 854
 855         printk("\n");
 856         printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
 857         printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
 858         printk(KERN_DEBUG ".......    : physical APIC id: %02X\n", reg_00.bits.ID);
 859         if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2)
 860                 UNEXPECTED_IO_APIC();
 861
 862         printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)&reg_01);
 863         printk(KERN_DEBUG ".......     : max redirection entries: %04X\n", reg_01.bits.entries);
 864         if (    (reg_01.bits.entries != 0x0f) && /* older (Neptune) boards */
 865                 (reg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */
 866                 (reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */
 867                 (reg_01.bits.entries != 0x1f) && /* dual Xeon boards */
 868                 (reg_01.bits.entries != 0x22) && /* bigger Xeon boards */
 869                 (reg_01.bits.entries != 0x2E) &&
 870                 (reg_01.bits.entries != 0x3F) &&
 871                 (reg_01.bits.entries != 0x03)
 872         )
 873                 UNEXPECTED_IO_APIC();
 874
 875         printk(KERN_DEBUG ".......     : PRQ implemented: %X\n", reg_01.bits.PRQ);
 876         printk(KERN_DEBUG ".......     : IO APIC version: %04X\n", reg_01.bits.version);
 877         if (    (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */
 878                 (reg_01.bits.version != 0x02) && /* 82801BA IO-APICs (ICH2) */
 879                 (reg_01.bits.version != 0x10) && /* oldest IO-APICs */
 880                 (reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */
 881                 (reg_01.bits.version != 0x13) && /* Xeon IO-APICs */
 882                 (reg_01.bits.version != 0x20)    /* Intel P64H (82806 AA) */
 883         )
 884                 UNEXPECTED_IO_APIC();
 885         if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2)
 886                 UNEXPECTED_IO_APIC();
 887
 888         if (reg_01.bits.version >= 0x10) {
 889                 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
 890                 printk(KERN_DEBUG ".......     : arbitration: %02X\n", reg_02.bits.arbitration);
 891                 if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2)
 892                         UNEXPECTED_IO_APIC();
 893         }
 894
 895         printk(KERN_DEBUG ".... IRQ redirection table:\n");
 896
 897         printk(KERN_DEBUG " NR Log Phy Mask Trig IRR Pol"
 898                           " Stat Dest Deli Vect:   \n");
 899
 900         for (i = 0; i <= reg_01.bits.entries; i++) {
 901                 struct IO_APIC_route_entry entry;
 902
 903                 spin_lock_irqsave(&ioapic_lock, flags);
 904                 *(((int *)&entry)+0) = io_apic_read(apic, 0x10+i*2);
 905                 *(((int *)&entry)+1) = io_apic_read(apic, 0x11+i*2);
 906                 spin_unlock_irqrestore(&ioapic_lock, flags);
 907
 908                 printk(KERN_DEBUG " %02x %03X %02X  ",
 909                         i,
 910                         entry.dest.logical.logical_dest,
 911                         entry.dest.physical.physical_dest
 912                 );
 913
 914                 printk("%1d    %1d    %1d   %1d   %1d    %1d    %1d    %02X\n",
 915                         entry.mask,
 916                         entry.trigger,
 917                         entry.irr,
 918                         entry.polarity,
 919                         entry.delivery_status,
 920                         entry.dest_mode,
 921                         entry.delivery_mode,
 922                         entry.vector
 923                 );
 924         }
 925         }
 926         if (use_pci_vector())
 927                 printk(KERN_INFO "Using vector-based indexing\n");
 928         printk(KERN_DEBUG "IRQ to pin mappings:\n");
 929         for (i = 0; i < NR_IRQS; i++) {
 930                 struct irq_pin_list *entry = irq_2_pin + i;
 931                 if (entry->pin < 0)
 932                         continue;
 933                 if (use_pci_vector() && !platform_legacy_irq(i))
 934                         printk(KERN_DEBUG "IRQ%d ", IO_APIC_VECTOR(i));
 935                 else
 936                         printk(KERN_DEBUG "IRQ%d ", i);
 937                 for (;;) {
 938                         printk("-> %d:%d", entry->apic, entry->pin);
 939                         if (!entry->next)
 940                                 break;
 941                         entry = irq_2_pin + entry->next;
 942                 }
 943                 printk("\n");
 944         }
 945
 946         printk(KERN_INFO ".................................... done.\n");
 947
 948         return;
 949 }
 950
 951 #if 0
 952
 953 static __apicdebuginit void print_APIC_bitfield (int base)
 954 {
 955         unsigned int v;
 956         int i, j;
 957
 958         if (apic_verbosity == APIC_QUIET)
 959                 return;
 960
 961         printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
 962         for (i = 0; i < 8; i++) {
 963                 v = apic_read(base + i*0x10);
 964                 for (j = 0; j < 32; j++) {
 965                         if (v & (1<<j))
 966                                 printk("1");
 967                         else
 968                                 printk("0");
 969                 }
 970                 printk("\n");
 971         }
 972 }
 973
 974 void __apicdebuginit print_local_APIC(void * dummy)
 975 {
 976         unsigned int v, ver, maxlvt;
 977
 978         if (apic_verbosity == APIC_QUIET)
 979                 return;
 980
 981         printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
 982                 smp_processor_id(), hard_smp_processor_id());
 983         v = apic_read(APIC_ID);
 984         printk(KERN_INFO "... APIC ID:      %08x (%01x)\n", v, GET_APIC_ID(v));
 985         v = apic_read(APIC_LVR);
 986         printk(KERN_INFO "... APIC VERSION: %08x\n", v);
 987         ver = GET_APIC_VERSION(v);
 988         maxlvt = get_maxlvt();
 989
 990         v = apic_read(APIC_TASKPRI);
 991         printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
 992
 993         if (APIC_INTEGRATED(ver)) {                     /* !82489DX */
 994                 v = apic_read(APIC_ARBPRI);
 995                 printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
 996                         v & APIC_ARBPRI_MASK);
 997                 v = apic_read(APIC_PROCPRI);
 998                 printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
 999         }
1000
1001         v = apic_read(APIC_EOI);
1002         printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
1003         v = apic_read(APIC_RRR);
1004         printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1005         v = apic_read(APIC_LDR);
1006         printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1007         v = apic_read(APIC_DFR);
1008         printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1009         v = apic_read(APIC_SPIV);
1010         printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1011
1012         printk(KERN_DEBUG "... APIC ISR field:\n");
1013         print_APIC_bitfield(APIC_ISR);
1014         printk(KERN_DEBUG "... APIC TMR field:\n");
1015         print_APIC_bitfield(APIC_TMR);
1016         printk(KERN_DEBUG "... APIC IRR field:\n");
1017         print_APIC_bitfield(APIC_IRR);
1018
1019         if (APIC_INTEGRATED(ver)) {             /* !82489DX */
1020                 if (maxlvt > 3)         /* Due to the Pentium erratum 3AP. */
1021                         apic_write(APIC_ESR, 0);
1022                 v = apic_read(APIC_ESR);
1023                 printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1024         }
1025
1026         v = apic_read(APIC_ICR);
1027         printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
1028         v = apic_read(APIC_ICR2);
1029         printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
1030
1031         v = apic_read(APIC_LVTT);
1032         printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1033
1034         if (maxlvt > 3) {                       /* PC is LVT#4. */
1035                 v = apic_read(APIC_LVTPC);
1036                 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1037         }
1038         v = apic_read(APIC_LVT0);
1039         printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1040         v = apic_read(APIC_LVT1);
1041         printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1042
1043         if (maxlvt > 2) {                       /* ERR is LVT#3. */
1044                 v = apic_read(APIC_LVTERR);
1045                 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1046         }
1047
1048         v = apic_read(APIC_TMICT);
1049         printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1050         v = apic_read(APIC_TMCCT);
1051         printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1052         v = apic_read(APIC_TDCR);
1053         printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1054         printk("\n");
1055 }
1056
1057 void print_all_local_APICs (void)
1058 {
1059         on_each_cpu(print_local_APIC, NULL, 1, 1);
1060 }
1061
1062 void __apicdebuginit print_PIC(void)
1063 {
1064         extern spinlock_t i8259A_lock;
1065         unsigned int v;
1066         unsigned long flags;
1067
1068         if (apic_verbosity == APIC_QUIET)
1069                 return;
1070
1071         printk(KERN_DEBUG "\nprinting PIC contents\n");
1072
1073         spin_lock_irqsave(&i8259A_lock, flags);
1074
1075         v = inb(0xa1) << 8 | inb(0x21);
1076         printk(KERN_DEBUG "... PIC  IMR: %04x\n", v);
1077
1078         v = inb(0xa0) << 8 | inb(0x20);
1079         printk(KERN_DEBUG "... PIC  IRR: %04x\n", v);
1080
1081         outb(0x0b,0xa0);
1082         outb(0x0b,0x20);
1083         v = inb(0xa0) << 8 | inb(0x20);
1084         outb(0x0a,0xa0);
1085         outb(0x0a,0x20);
1086
1087         spin_unlock_irqrestore(&i8259A_lock, flags);
1088
1089         printk(KERN_DEBUG "... PIC  ISR: %04x\n", v);
1090
1091         v = inb(0x4d1) << 8 | inb(0x4d0);
1092         printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1093 }
1094
1095 #endif  /*  0  */
1096
1097 static void __init enable_IO_APIC(void)
1098 {
1099         union IO_APIC_reg_01 reg_01;
1100         int i;
1101         unsigned long flags;
1102
1103         for (i = 0; i < PIN_MAP_SIZE; i++) {
1104                 irq_2_pin[i].pin = -1;
1105                 irq_2_pin[i].next = 0;
1106         }
1107         if (!pirqs_enabled)
1108                 for (i = 0; i < MAX_PIRQS; i++)
1109                         pirq_entries[i] = -1;
1110
1111         /*
1112          * The number of IO-APIC IRQ registers (== #pins):
1113          */
1114         for (i = 0; i < nr_ioapics; i++) {
1115                 spin_lock_irqsave(&ioapic_lock, flags);
1116                 reg_01.raw = io_apic_read(i, 1);
1117                 spin_unlock_irqrestore(&ioapic_lock, flags);
1118                 nr_ioapic_registers[i] = reg_01.bits.entries+1;
1119         }
1120
1121         /*
1122          * Do not trust the IO-APIC being empty at bootup
1123          */
1124         clear_IO_APIC();
1125 }
1126
1127 /*
1128  * Not an __init, needed by the reboot code
1129  */
1130 void disable_IO_APIC(void)
1131 {
1132         /*
1133          * Clear the IO-APIC before rebooting:
1134          */
1135         clear_IO_APIC();
1136
1137         disconnect_bsp_APIC();
1138 }
1139
1140 /*
1141  * function to set the IO-APIC physical IDs based on the
1142  * values stored in the MPC table.
1143  *
1144  * by Matt Domsch <Matt_Domsch@dell.com>  Tue Dec 21 12:25:05 CST 1999
1145  */
1146
1147 static void __init setup_ioapic_ids_from_mpc (void)
1148 {
1149         union IO_APIC_reg_00 reg_00;
1150         int apic;
1151         int i;
1152         unsigned char old_id;
1153         unsigned long flags;
1154
1155         /*
1156          * Set the IOAPIC ID to the value stored in the MPC table.
1157          */
1158         for (apic = 0; apic < nr_ioapics; apic++) {
1159
1160                 /* Read the register 0 value */
1161                 spin_lock_irqsave(&ioapic_lock, flags);
1162                 reg_00.raw = io_apic_read(apic, 0);
1163                 spin_unlock_irqrestore(&ioapic_lock, flags);
1164
1165                 old_id = mp_ioapics[apic].mpc_apicid;
1166
1167
1168                 printk(KERN_INFO "Using IO-APIC %d\n", mp_ioapics[apic].mpc_apicid);
1169
1170
1171                 /*
1172                  * We need to adjust the IRQ routing table
1173                  * if the ID changed.
1174                  */
1175                 if (old_id != mp_ioapics[apic].mpc_apicid)
1176                         for (i = 0; i < mp_irq_entries; i++)
1177                                 if (mp_irqs[i].mpc_dstapic == old_id)
1178                                         mp_irqs[i].mpc_dstapic
1179                                                 = mp_ioapics[apic].mpc_apicid;
1180
1181                 /*
1182                  * Read the right value from the MPC table and
1183                  * write it into the ID register.
1184                  */
1185                 apic_printk(APIC_VERBOSE,KERN_INFO "...changing IO-APIC physical APIC ID to %d ...",
1186                                 mp_ioapics[apic].mpc_apicid);
1187
1188                 reg_00.bits.ID = mp_ioapics[apic].mpc_apicid;
1189                 spin_lock_irqsave(&ioapic_lock, flags);
1190                 io_apic_write(apic, 0, reg_00.raw);
1191                 spin_unlock_irqrestore(&ioapic_lock, flags);
1192
1193                 /*
1194                  * Sanity check
1195                  */
1196                 spin_lock_irqsave(&ioapic_lock, flags);
1197                 reg_00.raw = io_apic_read(apic, 0);
1198                 spin_unlock_irqrestore(&ioapic_lock, flags);
1199                 if (reg_00.bits.ID != mp_ioapics[apic].mpc_apicid)
1200                         printk("could not set ID!\n");
1201                 else
1202                         apic_printk(APIC_VERBOSE," ok.\n");
1203         }
1204 }
1205
1206 /*
1207  * There is a nasty bug in some older SMP boards, their mptable lies
1208  * about the timer IRQ. We do the following to work around the situation:
1209  *
1210  *      - timer IRQ defaults to IO-APIC IRQ
1211  *      - if this function detects that timer IRQs are defunct, then we fall
1212  *        back to ISA timer IRQs
1213  */
1214 static int __init timer_irq_works(void)
1215 {
1216         unsigned long t1 = jiffies;
1217
1218         local_irq_enable();
1219         /* Let ten ticks pass... */
1220         mdelay((10 * 1000) / HZ);
1221
1222         /*
1223          * Expect a few ticks at least, to be sure some possible
1224          * glue logic does not lock up after one or two first
1225          * ticks in a non-ExtINT mode.  Also the local APIC
1226          * might have cached one ExtINT interrupt.  Finally, at
1227          * least one tick may be lost due to delays.
1228          */
1229
1230         /* jiffies wrap? */
1231         if (jiffies - t1 > 4)
1232                 return 1;
1233         return 0;
1234 }
1235
1236 /*
1237  * In the SMP+IOAPIC case it might happen that there are an unspecified
1238  * number of pending IRQ events unhandled. These cases are very rare,
1239  * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1240  * better to do it this way as thus we do not have to be aware of
1241  * 'pending' interrupts in the IRQ path, except at this point.
1242  */
1243 /*
1244  * Edge triggered needs to resend any interrupt
1245  * that was delayed but this is now handled in the device
1246  * independent code.
1247  */
1248
1249 /*
1250  * Starting up a edge-triggered IO-APIC interrupt is
1251  * nasty - we need to make sure that we get the edge.
1252  * If it is already asserted for some reason, we need
1253  * return 1 to indicate that is was pending.
1254  *
1255  * This is not complete - we should be able to fake
1256  * an edge even if it isn't on the 8259A...
1257  */
1258
1259 static unsigned int startup_edge_ioapic_irq(unsigned int irq)
1260 {
1261         int was_pending = 0;
1262         unsigned long flags;
1263
1264         spin_lock_irqsave(&ioapic_lock, flags);
1265         if (irq < 16) {
1266                 disable_8259A_irq(irq);
1267                 if (i8259A_irq_pending(irq))
1268                         was_pending = 1;
1269         }
1270         __unmask_IO_APIC_irq(irq);
1271         spin_unlock_irqrestore(&ioapic_lock, flags);
1272
1273         return was_pending;
1274 }
1275
1276 /*
1277  * Once we have recorded IRQ_PENDING already, we can mask the
1278  * interrupt for real. This prevents IRQ storms from unhandled
1279  * devices.
1280  */
1281 static void ack_edge_ioapic_irq(unsigned int irq)
1282 {
1283         if ((irq_desc[irq].status & (IRQ_PENDING | IRQ_DISABLED))
1284                                         == (IRQ_PENDING | IRQ_DISABLED))
1285                 mask_IO_APIC_irq(irq);
1286         ack_APIC_irq();
1287 }
1288
1289 /*
1290  * Level triggered interrupts can just be masked,
1291  * and shutting down and starting up the interrupt
1292  * is the same as enabling and disabling them -- except
1293  * with a startup need to return a "was pending" value.
1294  *
1295  * Level triggered interrupts are special because we
1296  * do not touch any IO-APIC register while handling
1297  * them. We ack the APIC in the end-IRQ handler, not
1298  * in the start-IRQ-handler. Protection against reentrance
1299  * from the same interrupt is still provided, both by the
1300  * generic IRQ layer and by the fact that an unacked local
1301  * APIC does not accept IRQs.
1302  */
1303 static unsigned int startup_level_ioapic_irq (unsigned int irq)
1304 {
1305         unmask_IO_APIC_irq(irq);
1306
1307         return 0; /* don't check for pending */
1308 }
1309
1310 static void end_level_ioapic_irq (unsigned int irq)
1311 {
1312         ack_APIC_irq();
1313 }
1314
1315 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
1316 {
1317         unsigned long flags;
1318         unsigned int dest;
1319
1320         dest = cpu_mask_to_apicid(mask);
1321
1322         /*
1323          * Only the high 8 bits are valid.
1324          */
1325         dest = SET_APIC_LOGICAL_ID(dest);
1326
1327         spin_lock_irqsave(&ioapic_lock, flags);
1328         __DO_ACTION(1, = dest, )
1329         spin_unlock_irqrestore(&ioapic_lock, flags);
1330 }
1331
1332 #ifdef CONFIG_PCI_MSI
1333 static unsigned int startup_edge_ioapic_vector(unsigned int vector)
1334 {
1335         int irq = vector_to_irq(vector);
1336
1337         return startup_edge_ioapic_irq(irq);
1338 }
1339
1340 static void ack_edge_ioapic_vector(unsigned int vector)
1341 {
1342         int irq = vector_to_irq(vector);
1343
1344         ack_edge_ioapic_irq(irq);
1345 }
1346
1347 static unsigned int startup_level_ioapic_vector (unsigned int vector)
1348 {
1349         int irq = vector_to_irq(vector);
1350
1351         return startup_level_ioapic_irq (irq);
1352 }
1353
1354 static void end_level_ioapic_vector (unsigned int vector)
1355 {
1356         int irq = vector_to_irq(vector);
1357
1358         end_level_ioapic_irq(irq);
1359 }
1360
1361 static void mask_IO_APIC_vector (unsigned int vector)
1362 {
1363         int irq = vector_to_irq(vector);
1364
1365         mask_IO_APIC_irq(irq);
1366 }
1367
1368 static void unmask_IO_APIC_vector (unsigned int vector)
1369 {
1370         int irq = vector_to_irq(vector);
1371
1372         unmask_IO_APIC_irq(irq);
1373 }
1374
1375 static void set_ioapic_affinity_vector (unsigned int vector,
1376                                         cpumask_t cpu_mask)
1377 {
1378         int irq = vector_to_irq(vector);
1379
1380         set_ioapic_affinity_irq(irq, cpu_mask);
1381 }
1382 #endif
1383
1384 /*
1385  * Level and edge triggered IO-APIC interrupts need different handling,
1386  * so we use two separate IRQ descriptors. Edge triggered IRQs can be
1387  * handled with the level-triggered descriptor, but that one has slightly
1388  * more overhead. Level-triggered interrupts cannot be handled with the
1389  * edge-triggered handler, without risking IRQ storms and other ugly
1390  * races.
1391  */
1392
1393 static struct hw_interrupt_type ioapic_edge_type = {
1394         .typename = "IO-APIC-edge",
1395         .startup        = startup_edge_ioapic,
1396         .shutdown       = shutdown_edge_ioapic,
1397         .enable         = enable_edge_ioapic,
1398         .disable        = disable_edge_ioapic,
1399         .ack            = ack_edge_ioapic,
1400         .end            = end_edge_ioapic,
1401         .set_affinity = set_ioapic_affinity,
1402 };
1403
1404 static struct hw_interrupt_type ioapic_level_type = {
1405         .typename = "IO-APIC-level",
1406         .startup        = startup_level_ioapic,
1407         .shutdown       = shutdown_level_ioapic,
1408         .enable         = enable_level_ioapic,
1409         .disable        = disable_level_ioapic,
1410         .ack            = mask_and_ack_level_ioapic,
1411         .end            = end_level_ioapic,
1412         .set_affinity = set_ioapic_affinity,
1413 };
1414
1415 static inline void init_IO_APIC_traps(void)
1416 {
1417         int irq;
1418
1419         /*
1420          * NOTE! The local APIC isn't very good at handling
1421          * multiple interrupts at the same interrupt level.
1422          * As the interrupt level is determined by taking the
1423          * vector number and shifting that right by 4, we
1424          * want to spread these out a bit so that they don't
1425          * all fall in the same interrupt level.
1426          *
1427          * Also, we've got to be careful not to trash gate
1428          * 0x80, because int 0x80 is hm, kind of importantish. ;)
1429          */
1430         for (irq = 0; irq < NR_IRQS ; irq++) {
1431                 int tmp = irq;
1432                 if (use_pci_vector()) {
1433                         if (!platform_legacy_irq(tmp))
1434                                 if ((tmp = vector_to_irq(tmp)) == -1)
1435                                         continue;
1436                 }
1437                 if (IO_APIC_IRQ(tmp) && !IO_APIC_VECTOR(tmp)) {
1438                         /*
1439                          * Hmm.. We don't have an entry for this,
1440                          * so default to an old-fashioned 8259
1441                          * interrupt if we can..
1442                          */
1443                         if (irq < 16)
1444                                 make_8259A_irq(irq);
1445                         else
1446                                 /* Strange. Oh, well.. */
1447                                 irq_desc[irq].handler = &no_irq_type;
1448                 }
1449         }
1450 }
1451
1452 static void enable_lapic_irq (unsigned int irq)
1453 {
1454         unsigned long v;
1455
1456         v = apic_read(APIC_LVT0);
1457         apic_write_around(APIC_LVT0, v & ~APIC_LVT_MASKED);
1458 }
1459
1460 static void disable_lapic_irq (unsigned int irq)
1461 {
1462         unsigned long v;
1463
1464         v = apic_read(APIC_LVT0);
1465         apic_write_around(APIC_LVT0, v | APIC_LVT_MASKED);
1466 }
1467
1468 static void ack_lapic_irq (unsigned int irq)
1469 {
1470         ack_APIC_irq();
1471 }
1472
1473 static void end_lapic_irq (unsigned int i) { /* nothing */ }
1474
1475 static struct hw_interrupt_type lapic_irq_type = {
1476         .typename = "local-APIC-edge",
1477         .startup = NULL, /* startup_irq() not used for IRQ0 */
1478         .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
1479         .enable = enable_lapic_irq,
1480         .disable = disable_lapic_irq,
1481         .ack = ack_lapic_irq,
1482         .end = end_lapic_irq,
1483 };
1484
1485 static void setup_nmi (void)
1486 {
1487         /*
1488          * Dirty trick to enable the NMI watchdog ...
1489          * We put the 8259A master into AEOI mode and
1490          * unmask on all local APICs LVT0 as NMI.
1491          *
1492          * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
1493          * is from Maciej W. Rozycki - so we do not have to EOI from
1494          * the NMI handler or the timer interrupt.
1495          */
1496         printk(KERN_INFO "activating NMI Watchdog ...");
1497
1498         enable_NMI_through_LVT0(NULL);
1499
1500         printk(" done.\n");
1501 }
1502
1503 /*
1504  * This looks a bit hackish but it's about the only one way of sending
1505  * a few INTA cycles to 8259As and any associated glue logic.  ICR does
1506  * not support the ExtINT mode, unfortunately.  We need to send these
1507  * cycles as some i82489DX-based boards have glue logic that keeps the
1508  * 8259A interrupt line asserted until INTA.  --macro
1509  */
1510 static inline void unlock_ExtINT_logic(void)
1511 {
1512         int pin, i;
1513         struct IO_APIC_route_entry entry0, entry1;
1514         unsigned char save_control, save_freq_select;
1515         unsigned long flags;
1516
1517         pin = find_isa_irq_pin(8, mp_INT);
1518         if (pin == -1)
1519                 return;
1520
1521         spin_lock_irqsave(&ioapic_lock, flags);
1522         *(((int *)&entry0) + 1) = io_apic_read(0, 0x11 + 2 * pin);
1523         *(((int *)&entry0) + 0) = io_apic_read(0, 0x10 + 2 * pin);
1524         spin_unlock_irqrestore(&ioapic_lock, flags);
1525         clear_IO_APIC_pin(0, pin);
1526
1527         memset(&entry1, 0, sizeof(entry1));
1528
1529         entry1.dest_mode = 0;                   /* physical delivery */
1530         entry1.mask = 0;                        /* unmask IRQ now */
1531         entry1.dest.physical.physical_dest = hard_smp_processor_id();
1532         entry1.delivery_mode = dest_ExtINT;
1533         entry1.polarity = entry0.polarity;
1534         entry1.trigger = 0;
1535         entry1.vector = 0;
1536
1537         spin_lock_irqsave(&ioapic_lock, flags);
1538         io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
1539         io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
1540         spin_unlock_irqrestore(&ioapic_lock, flags);
1541
1542         save_control = CMOS_READ(RTC_CONTROL);
1543         save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
1544         CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
1545                    RTC_FREQ_SELECT);
1546         CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
1547
1548         i = 100;
1549         while (i-- > 0) {
1550                 mdelay(10);
1551                 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
1552                         i -= 10;
1553         }
1554
1555         CMOS_WRITE(save_control, RTC_CONTROL);
1556         CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1557         clear_IO_APIC_pin(0, pin);
1558
1559         spin_lock_irqsave(&ioapic_lock, flags);
1560         io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
1561         io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
1562         spin_unlock_irqrestore(&ioapic_lock, flags);
1563 }
1564
1565 /*
1566  * This code may look a bit paranoid, but it's supposed to cooperate with
1567  * a wide range of boards and BIOS bugs.  Fortunately only the timer IRQ
1568  * is so screwy.  Thanks to Brian Perkins for testing/hacking this beast
1569  * fanatically on his truly buggy board.
1570  */
1571 static inline void check_timer(void)
1572 {
1573         int pin1, pin2;
1574         int vector;
1575
1576         /*
1577          * get/set the timer IRQ vector:
1578          */
1579         disable_8259A_irq(0);
1580         vector = assign_irq_vector(0);
1581         set_intr_gate(vector, interrupt[0]);
1582
1583         /*
1584          * Subtle, code in do_timer_interrupt() expects an AEOI
1585          * mode for the 8259A whenever interrupts are routed
1586          * through I/O APICs.  Also IRQ0 has to be enabled in
1587          * the 8259A which implies the virtual wire has to be
1588          * disabled in the local APIC.
1589          */
1590         apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
1591         init_8259A(1);
1592         enable_8259A_irq(0);
1593
1594         pin1 = find_isa_irq_pin(0, mp_INT);
1595         pin2 = find_isa_irq_pin(0, mp_ExtINT);
1596
1597         apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X pin1=%d pin2=%d\n", vector, pin1, pin2);
1598
1599         if (pin1 != -1) {
1600                 /*
1601                  * Ok, does IRQ0 through the IOAPIC work?
1602                  */
1603                 unmask_IO_APIC_irq(0);
1604                 if (timer_irq_works()) {
1605                         nmi_watchdog_default();
1606                         if (nmi_watchdog == NMI_IO_APIC) {
1607                                 disable_8259A_irq(0);
1608                                 setup_nmi();
1609                                 enable_8259A_irq(0);
1610                         }
1611                         return;
1612                 }
1613                 clear_IO_APIC_pin(0, pin1);
1614                 apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not connected to IO-APIC\n");
1615         }
1616
1617         apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) through the 8259A ... ");
1618         if (pin2 != -1) {
1619                 apic_printk(APIC_VERBOSE,"\n..... (found pin %d) ...", pin2);
1620                 /*
1621                  * legacy devices should be connected to IO APIC #0
1622                  */
1623                 setup_ExtINT_IRQ0_pin(pin2, vector);
1624                 if (timer_irq_works()) {
1625                         printk("works.\n");
1626                         nmi_watchdog_default();
1627                         if (nmi_watchdog == NMI_IO_APIC) {
1628                                 setup_nmi();
1629                         }
1630                         return;
1631                 }
1632                 /*
1633                  * Cleanup, just in case ...
1634                  */
1635                 clear_IO_APIC_pin(0, pin2);
1636         }
1637         printk(" failed.\n");
1638
1639         if (nmi_watchdog) {
1640                 printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
1641                 nmi_watchdog = 0;
1642         }
1643
1644         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
1645
1646         disable_8259A_irq(0);
1647         irq_desc[0].handler = &lapic_irq_type;
1648         apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector);   /* Fixed mode */
1649         enable_8259A_irq(0);
1650
1651         if (timer_irq_works()) {
1652                 apic_printk(APIC_QUIET, " works.\n");
1653                 return;
1654         }
1655         apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector);
1656         apic_printk(APIC_VERBOSE," failed.\n");
1657
1658         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as ExtINT IRQ...");
1659
1660         init_8259A(0);
1661         make_8259A_irq(0);
1662         apic_write_around(APIC_LVT0, APIC_DM_EXTINT);
1663
1664         unlock_ExtINT_logic();
1665
1666         if (timer_irq_works()) {
1667                 apic_printk(APIC_VERBOSE," works.\n");
1668                 return;
1669         }
1670         apic_printk(APIC_VERBOSE," failed :(.\n");
1671         panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n");
1672 }
1673
1674 /*
1675  *
1676  * IRQ's that are handled by the PIC in the MPS IOAPIC case.
1677  * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
1678  *   Linux doesn't really care, as it's not actually used
1679  *   for any interrupt handling anyway.
1680  */
1681 #define PIC_IRQS        (1<<2)
1682
1683 void __init setup_IO_APIC(void)
1684 {
1685         enable_IO_APIC();
1686
1687         if (acpi_ioapic)
1688                 io_apic_irqs = ~0;      /* all IRQs go through IOAPIC */
1689         else
1690                 io_apic_irqs = ~PIC_IRQS;
1691
1692         apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
1693
1694         /*
1695          * Set up the IO-APIC IRQ routing table.
1696          */
1697         if (!acpi_ioapic)
1698                 setup_ioapic_ids_from_mpc();
1699         sync_Arb_IDs();
1700         setup_IO_APIC_irqs();
1701         init_IO_APIC_traps();
1702         check_timer();
1703         if (!acpi_ioapic)
1704                 print_IO_APIC();
1705 }
1706
1707 struct sysfs_ioapic_data {
1708         struct sys_device dev;
1709         struct IO_APIC_route_entry entry[0];
1710 };
1711 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
1712
1713 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
1714 {
1715         struct IO_APIC_route_entry *entry;
1716         struct sysfs_ioapic_data *data;
1717         unsigned long flags;
1718         int i;
1719
1720         data = container_of(dev, struct sysfs_ioapic_data, dev);
1721         entry = data->entry;
1722         spin_lock_irqsave(&ioapic_lock, flags);
1723         for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) {
1724                 *(((int *)entry) + 1) = io_apic_read(dev->id, 0x11 + 2 * i);
1725                 *(((int *)entry) + 0) = io_apic_read(dev->id, 0x10 + 2 * i);
1726         }
1727         spin_unlock_irqrestore(&ioapic_lock, flags);
1728
1729         return 0;
1730 }
1731
1732 static int ioapic_resume(struct sys_device *dev)
1733 {
1734         struct IO_APIC_route_entry *entry;
1735         struct sysfs_ioapic_data *data;
1736         unsigned long flags;
1737         union IO_APIC_reg_00 reg_00;
1738         int i;
1739
1740         data = container_of(dev, struct sysfs_ioapic_data, dev);
1741         entry = data->entry;
1742
1743         spin_lock_irqsave(&ioapic_lock, flags);
1744         reg_00.raw = io_apic_read(dev->id, 0);
1745         if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
1746                 reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
1747                 io_apic_write(dev->id, 0, reg_00.raw);
1748         }
1749         for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) {
1750                 io_apic_write(dev->id, 0x11+2*i, *(((int *)entry)+1));
1751                 io_apic_write(dev->id, 0x10+2*i, *(((int *)entry)+0));
1752         }
1753         spin_unlock_irqrestore(&ioapic_lock, flags);
1754
1755         return 0;
1756 }
1757
1758 static struct sysdev_class ioapic_sysdev_class = {
1759         set_kset_name("ioapic"),
1760         .suspend = ioapic_suspend,
1761         .resume = ioapic_resume,
1762 };
1763
1764 static int __init ioapic_init_sysfs(void)
1765 {
1766         struct sys_device * dev;
1767         int i, size, error = 0;
1768
1769         error = sysdev_class_register(&ioapic_sysdev_class);
1770         if (error)
1771                 return error;
1772
1773         for (i = 0; i < nr_ioapics; i++ ) {
1774                 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
1775                         * sizeof(struct IO_APIC_route_entry);
1776                 mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL);
1777                 if (!mp_ioapic_data[i]) {
1778                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1779                         continue;
1780                 }
1781                 memset(mp_ioapic_data[i], 0, size);
1782                 dev = &mp_ioapic_data[i]->dev;
1783                 dev->id = i;
1784                 dev->cls = &ioapic_sysdev_class;
1785                 error = sysdev_register(dev);
1786                 if (error) {
1787                         kfree(mp_ioapic_data[i]);
1788                         mp_ioapic_data[i] = NULL;
1789                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1790                         continue;
1791                 }
1792         }
1793
1794         return 0;
1795 }
1796
1797 device_initcall(ioapic_init_sysfs);
1798
1799 /* --------------------------------------------------------------------------
1800                           ACPI-based IOAPIC Configuration
1801    -------------------------------------------------------------------------- */
1802
1803 #ifdef CONFIG_ACPI_BOOT
1804
1805 #define IO_APIC_MAX_ID          0xFE
1806
1807 int __init io_apic_get_version (int ioapic)
1808 {
1809         union IO_APIC_reg_01    reg_01;
1810         unsigned long flags;
1811
1812         spin_lock_irqsave(&ioapic_lock, flags);
1813         reg_01.raw = io_apic_read(ioapic, 1);
1814         spin_unlock_irqrestore(&ioapic_lock, flags);
1815
1816         return reg_01.bits.version;
1817 }
1818
1819
1820 int __init io_apic_get_redir_entries (int ioapic)
1821 {
1822         union IO_APIC_reg_01    reg_01;
1823         unsigned long flags;
1824
1825         spin_lock_irqsave(&ioapic_lock, flags);
1826         reg_01.raw = io_apic_read(ioapic, 1);
1827         spin_unlock_irqrestore(&ioapic_lock, flags);
1828
1829         return reg_01.bits.entries;
1830 }
1831
1832
1833 int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low)
1834 {
1835         struct IO_APIC_route_entry entry;
1836         unsigned long flags;
1837
1838         if (!IO_APIC_IRQ(irq)) {
1839                 apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
1840                         ioapic);
1841                 return -EINVAL;
1842         }
1843
1844         /*
1845          * Generate a PCI IRQ routing entry and program the IOAPIC accordingly.
1846          * Note that we mask (disable) IRQs now -- these get enabled when the
1847          * corresponding device driver registers for this IRQ.
1848          */
1849
1850         memset(&entry,0,sizeof(entry));
1851
1852         entry.delivery_mode = INT_DELIVERY_MODE;
1853         entry.dest_mode = INT_DEST_MODE;
1854         entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
1855         entry.trigger = edge_level;
1856         entry.polarity = active_high_low;
1857         entry.mask = 1;                                  /* Disabled (masked) */
1858
1859         /*
1860          * IRQs < 16 are already in the irq_2_pin[] map
1861          */
1862         if (irq >= 16)
1863                 add_pin_to_irq(irq, ioapic, pin);
1864
1865         entry.vector = assign_irq_vector(irq);
1866
1867         apic_printk(APIC_VERBOSE,KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry (%d-%d -> 0x%x -> "
1868                 "IRQ %d Mode:%i Active:%i)\n", ioapic,
1869                mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq,
1870                edge_level, active_high_low);
1871
1872         ioapic_register_intr(irq, entry.vector, edge_level);
1873
1874         if (!ioapic && (irq < 16))
1875                 disable_8259A_irq(irq);
1876
1877         spin_lock_irqsave(&ioapic_lock, flags);
1878         io_apic_write(ioapic, 0x11+2*pin, *(((int *)&entry)+1));
1879         io_apic_write(ioapic, 0x10+2*pin, *(((int *)&entry)+0));
1880         spin_unlock_irqrestore(&ioapic_lock, flags);
1881
1882         return 0;
1883 }
1884
1885 #endif /*CONFIG_ACPI_BOOT*/
1886
1887
1888 /*
1889  * This function currently is only a helper for the i386 smp boot process where
1890  * we need to reprogram the ioredtbls to cater for the cpus which have come online
1891  * so mask in all cases should simply be TARGET_CPUS
1892  */
1893 void __init setup_ioapic_dest(void)
1894 {
1895         int pin, ioapic, irq, irq_entry;
1896
1897         if (skip_ioapic_setup == 1)
1898                 return;
1899
1900         for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
1901                 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
1902                         irq_entry = find_irq_entry(ioapic, pin, mp_INT);
1903                         if (irq_entry == -1)
1904                                 continue;
1905                         irq = pin_2_irq(irq_entry, ioapic, pin);
1906                         set_ioapic_affinity_irq(irq, TARGET_CPUS);
1907                 }
1908
1909         }
1910 }