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 #include <asm/acpi.h>
  41
  42 #define __apicdebuginit  __init
  43
  44 int sis_apic_bug; /* not actually supported, dummy for compile */
  45
  46 static int no_timer_check;
  47
  48 static DEFINE_SPINLOCK(ioapic_lock);
  49
  50 /*
  51  * # of IRQ routing registers
  52  */
  53 int nr_ioapic_registers[MAX_IO_APICS];
  54
  55 /*
  56  * Rough estimation of how many shared IRQs there are, can
  57  * be changed anytime.
  58  */
  59 #define MAX_PLUS_SHARED_IRQS NR_IRQS
  60 #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
  61
  62 /*
  63  * This is performance-critical, we want to do it O(1)
  64  *
  65  * the indexing order of this array favors 1:1 mappings
  66  * between pins and IRQs.
  67  */
  68
  69 static struct irq_pin_list {
  70         short apic, pin, next;
  71 } irq_2_pin[PIN_MAP_SIZE];
  72
  73 int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1};
  74 #ifdef CONFIG_PCI_MSI
  75 #define vector_to_irq(vector)   \
  76         (platform_legacy_irq(vector) ? vector : vector_irq[vector])
  77 #else
  78 #define vector_to_irq(vector)   (vector)
  79 #endif
  80
  81 /*
  82  * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
  83  * shared ISA-space IRQs, so we have to support them. We are super
  84  * fast in the common case, and fast for shared ISA-space IRQs.
  85  */
  86 static void add_pin_to_irq(unsigned int irq, int apic, int pin)
  87 {
  88         static int first_free_entry = NR_IRQS;
  89         struct irq_pin_list *entry = irq_2_pin + irq;
  90
  91         while (entry->next)
  92                 entry = irq_2_pin + entry->next;
  93
  94         if (entry->pin != -1) {
  95                 entry->next = first_free_entry;
  96                 entry = irq_2_pin + entry->next;
  97                 if (++first_free_entry >= PIN_MAP_SIZE)
  98                         panic("io_apic.c: whoops");
  99         }
 100         entry->apic = apic;
 101         entry->pin = pin;
 102 }
 103
 104 #define __DO_ACTION(R, ACTION, FINAL)                                   \
 105                                                                         \
 106 {                                                                       \
 107         int pin;                                                        \
 108         struct irq_pin_list *entry = irq_2_pin + irq;                   \
 109                                                                         \
 110         for (;;) {                                                      \
 111                 unsigned int reg;                                       \
 112                 pin = entry->pin;                                       \
 113                 if (pin == -1)                                          \
 114                         break;                                          \
 115                 reg = io_apic_read(entry->apic, 0x10 + R + pin*2);      \
 116                 reg ACTION;                                             \
 117                 io_apic_modify(entry->apic, reg);                       \
 118                 if (!entry->next)                                       \
 119                         break;                                          \
 120                 entry = irq_2_pin + entry->next;                        \
 121         }                                                               \
 122         FINAL;                                                          \
 123 }
 124
 125 #define DO_ACTION(name,R,ACTION, FINAL)                                 \
 126                                                                         \
 127         static void name##_IO_APIC_irq (unsigned int irq)               \
 128         __DO_ACTION(R, ACTION, FINAL)
 129
 130 DO_ACTION( __mask,             0, |= 0x00010000, io_apic_sync(entry->apic) )
 131                                                 /* mask = 1 */
 132 DO_ACTION( __unmask,           0, &= 0xfffeffff, )
 133                                                 /* mask = 0 */
 134
 135 static void mask_IO_APIC_irq (unsigned int irq)
 136 {
 137         unsigned long flags;
 138
 139         spin_lock_irqsave(&ioapic_lock, flags);
 140         __mask_IO_APIC_irq(irq);
 141         spin_unlock_irqrestore(&ioapic_lock, flags);
 142 }
 143
 144 static void unmask_IO_APIC_irq (unsigned int irq)
 145 {
 146         unsigned long flags;
 147
 148         spin_lock_irqsave(&ioapic_lock, flags);
 149         __unmask_IO_APIC_irq(irq);
 150         spin_unlock_irqrestore(&ioapic_lock, flags);
 151 }
 152
 153 static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
 154 {
 155         struct IO_APIC_route_entry entry;
 156         unsigned long flags;
 157
 158         /* Check delivery_mode to be sure we're not clearing an SMI pin */
 159         spin_lock_irqsave(&ioapic_lock, flags);
 160         *(((int*)&entry) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
 161         *(((int*)&entry) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
 162         spin_unlock_irqrestore(&ioapic_lock, flags);
 163         if (entry.delivery_mode == dest_SMI)
 164                 return;
 165         /*
 166          * Disable it in the IO-APIC irq-routing table:
 167          */
 168         memset(&entry, 0, sizeof(entry));
 169         entry.mask = 1;
 170         spin_lock_irqsave(&ioapic_lock, flags);
 171         io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry) + 0));
 172         io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry) + 1));
 173         spin_unlock_irqrestore(&ioapic_lock, flags);
 174 }
 175
 176 static void clear_IO_APIC (void)
 177 {
 178         int apic, pin;
 179
 180         for (apic = 0; apic < nr_ioapics; apic++)
 181                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
 182                         clear_IO_APIC_pin(apic, pin);
 183 }
 184
 185 /*
 186  * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
 187  * specific CPU-side IRQs.
 188  */
 189
 190 #define MAX_PIRQS 8
 191 static int pirq_entries [MAX_PIRQS];
 192 static int pirqs_enabled;
 193 int skip_ioapic_setup;
 194 int ioapic_force;
 195
 196 /* dummy parsing: see setup.c */
 197
 198 static int __init disable_ioapic_setup(char *str)
 199 {
 200         skip_ioapic_setup = 1;
 201         return 1;
 202 }
 203
 204 static int __init enable_ioapic_setup(char *str)
 205 {
 206         ioapic_force = 1;
 207         skip_ioapic_setup = 0;
 208         return 1;
 209 }
 210
 211 __setup("noapic", disable_ioapic_setup);
 212 __setup("apic", enable_ioapic_setup);
 213
 214 #include <asm/pci-direct.h>
 215 #include <linux/pci_ids.h>
 216 #include <linux/pci.h>
 217
 218 /* Temporary Hack. Nvidia and VIA boards currently only work with IO-APIC
 219    off. Check for an Nvidia or VIA PCI bridge and turn it off.
 220    Use pci direct infrastructure because this runs before the PCI subsystem.
 221
 222    Can be overwritten with "apic"
 223
 224    And another hack to disable the IOMMU on VIA chipsets.
 225
 226    Kludge-O-Rama. */
 227 void __init check_ioapic(void)
 228 {
 229         int num,slot,func;
 230         if (ioapic_force)
 231                 return;
 232
 233         /* Poor man's PCI discovery */
 234         for (num = 0; num < 32; num++) {
 235                 for (slot = 0; slot < 32; slot++) {
 236                         for (func = 0; func < 8; func++) {
 237                                 u32 class;
 238                                 u32 vendor;
 239                                 u8 type;
 240                                 class = read_pci_config(num,slot,func,
 241                                                         PCI_CLASS_REVISION);
 242                                 if (class == 0xffffffff)
 243                                         break;
 244
 245                                 if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
 246                                         continue;
 247
 248                                 vendor = read_pci_config(num, slot, func,
 249                                                          PCI_VENDOR_ID);
 250                                 vendor &= 0xffff;
 251                                 switch (vendor) {
 252                                 case PCI_VENDOR_ID_VIA:
 253 #ifdef CONFIG_GART_IOMMU
 254                                         if ((end_pfn >= (0xffffffff>>PAGE_SHIFT) ||
 255                                              force_iommu) &&
 256                                             !iommu_aperture_allowed) {
 257                                                 printk(KERN_INFO
 258     "Looks like a VIA chipset. Disabling IOMMU. Overwrite with \"iommu=allowed\"\n");
 259                                                 iommu_aperture_disabled = 1;
 260                                         }
 261 #endif
 262                                         return;
 263                                 case PCI_VENDOR_ID_NVIDIA:
 264 #ifdef CONFIG_ACPI
 265                                         /* All timer overrides on Nvidia
 266                                            seem to be wrong. Skip them. */
 267                                         acpi_skip_timer_override = 1;
 268                                         printk(KERN_INFO
 269              "Nvidia board detected. Ignoring ACPI timer override.\n");
 270 #endif
 271                                         /* RED-PEN skip them on mptables too? */
 272                                         return;
 273                                 }
 274
 275                                 /* No multi-function device? */
 276                                 type = read_pci_config_byte(num,slot,func,
 277                                                             PCI_HEADER_TYPE);
 278                                 if (!(type & 0x80))
 279                                         break;
 280                         }
 281                 }
 282         }
 283 }
 284
 285 static int __init ioapic_pirq_setup(char *str)
 286 {
 287         int i, max;
 288         int ints[MAX_PIRQS+1];
 289
 290         get_options(str, ARRAY_SIZE(ints), ints);
 291
 292         for (i = 0; i < MAX_PIRQS; i++)
 293                 pirq_entries[i] = -1;
 294
 295         pirqs_enabled = 1;
 296         apic_printk(APIC_VERBOSE, "PIRQ redirection, working around broken MP-BIOS.\n");
 297         max = MAX_PIRQS;
 298         if (ints[0] < MAX_PIRQS)
 299                 max = ints[0];
 300
 301         for (i = 0; i < max; i++) {
 302                 apic_printk(APIC_VERBOSE, "... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
 303                 /*
 304                  * PIRQs are mapped upside down, usually.
 305                  */
 306                 pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
 307         }
 308         return 1;
 309 }
 310
 311 __setup("pirq=", ioapic_pirq_setup);
 312
 313 /*
 314  * Find the IRQ entry number of a certain pin.
 315  */
 316 static int find_irq_entry(int apic, int pin, int type)
 317 {
 318         int i;
 319
 320         for (i = 0; i < mp_irq_entries; i++)
 321                 if (mp_irqs[i].mpc_irqtype == type &&
 322                     (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
 323                      mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
 324                     mp_irqs[i].mpc_dstirq == pin)
 325                         return i;
 326
 327         return -1;
 328 }
 329
 330 /*
 331  * Find the pin to which IRQ[irq] (ISA) is connected
 332  */
 333 static int find_isa_irq_pin(int irq, int type)
 334 {
 335         int i;
 336
 337         for (i = 0; i < mp_irq_entries; i++) {
 338                 int lbus = mp_irqs[i].mpc_srcbus;
 339
 340                 if ((mp_bus_id_to_type[lbus] == MP_BUS_ISA ||
 341                      mp_bus_id_to_type[lbus] == MP_BUS_EISA ||
 342                      mp_bus_id_to_type[lbus] == MP_BUS_MCA) &&
 343                     (mp_irqs[i].mpc_irqtype == type) &&
 344                     (mp_irqs[i].mpc_srcbusirq == irq))
 345
 346                         return mp_irqs[i].mpc_dstirq;
 347         }
 348         return -1;
 349 }
 350
 351 /*
 352  * Find a specific PCI IRQ entry.
 353  * Not an __init, possibly needed by modules
 354  */
 355 static int pin_2_irq(int idx, int apic, int pin);
 356
 357 int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
 358 {
 359         int apic, i, best_guess = -1;
 360
 361         apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
 362                 bus, slot, pin);
 363         if (mp_bus_id_to_pci_bus[bus] == -1) {
 364                 apic_printk(APIC_VERBOSE, "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
 365                 return -1;
 366         }
 367         for (i = 0; i < mp_irq_entries; i++) {
 368                 int lbus = mp_irqs[i].mpc_srcbus;
 369
 370                 for (apic = 0; apic < nr_ioapics; apic++)
 371                         if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
 372                             mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
 373                                 break;
 374
 375                 if ((mp_bus_id_to_type[lbus] == MP_BUS_PCI) &&
 376                     !mp_irqs[i].mpc_irqtype &&
 377                     (bus == lbus) &&
 378                     (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
 379                         int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
 380
 381                         if (!(apic || IO_APIC_IRQ(irq)))
 382                                 continue;
 383
 384                         if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
 385                                 return irq;
 386                         /*
 387                          * Use the first all-but-pin matching entry as a
 388                          * best-guess fuzzy result for broken mptables.
 389                          */
 390                         if (best_guess < 0)
 391                                 best_guess = irq;
 392                 }
 393         }
 394         return best_guess;
 395 }
 396
 397 /*
 398  * EISA Edge/Level control register, ELCR
 399  */
 400 static int EISA_ELCR(unsigned int irq)
 401 {
 402         if (irq < 16) {
 403                 unsigned int port = 0x4d0 + (irq >> 3);
 404                 return (inb(port) >> (irq & 7)) & 1;
 405         }
 406         apic_printk(APIC_VERBOSE, "Broken MPtable reports ISA irq %d\n", irq);
 407         return 0;
 408 }
 409
 410 /* EISA interrupts are always polarity zero and can be edge or level
 411  * trigger depending on the ELCR value.  If an interrupt is listed as
 412  * EISA conforming in the MP table, that means its trigger type must
 413  * be read in from the ELCR */
 414
 415 #define default_EISA_trigger(idx)       (EISA_ELCR(mp_irqs[idx].mpc_srcbusirq))
 416 #define default_EISA_polarity(idx)      (0)
 417
 418 /* ISA interrupts are always polarity zero edge triggered,
 419  * when listed as conforming in the MP table. */
 420
 421 #define default_ISA_trigger(idx)        (0)
 422 #define default_ISA_polarity(idx)       (0)
 423
 424 /* PCI interrupts are always polarity one level triggered,
 425  * when listed as conforming in the MP table. */
 426
 427 #define default_PCI_trigger(idx)        (1)
 428 #define default_PCI_polarity(idx)       (1)
 429
 430 /* MCA interrupts are always polarity zero level triggered,
 431  * when listed as conforming in the MP table. */
 432
 433 #define default_MCA_trigger(idx)        (1)
 434 #define default_MCA_polarity(idx)       (0)
 435
 436 static int __init MPBIOS_polarity(int idx)
 437 {
 438         int bus = mp_irqs[idx].mpc_srcbus;
 439         int polarity;
 440
 441         /*
 442          * Determine IRQ line polarity (high active or low active):
 443          */
 444         switch (mp_irqs[idx].mpc_irqflag & 3)
 445         {
 446                 case 0: /* conforms, ie. bus-type dependent polarity */
 447                 {
 448                         switch (mp_bus_id_to_type[bus])
 449                         {
 450                                 case MP_BUS_ISA: /* ISA pin */
 451                                 {
 452                                         polarity = default_ISA_polarity(idx);
 453                                         break;
 454                                 }
 455                                 case MP_BUS_EISA: /* EISA pin */
 456                                 {
 457                                         polarity = default_EISA_polarity(idx);
 458                                         break;
 459                                 }
 460                                 case MP_BUS_PCI: /* PCI pin */
 461                                 {
 462                                         polarity = default_PCI_polarity(idx);
 463                                         break;
 464                                 }
 465                                 case MP_BUS_MCA: /* MCA pin */
 466                                 {
 467                                         polarity = default_MCA_polarity(idx);
 468                                         break;
 469                                 }
 470                                 default:
 471                                 {
 472                                         printk(KERN_WARNING "broken BIOS!!\n");
 473                                         polarity = 1;
 474                                         break;
 475                                 }
 476                         }
 477                         break;
 478                 }
 479                 case 1: /* high active */
 480                 {
 481                         polarity = 0;
 482                         break;
 483                 }
 484                 case 2: /* reserved */
 485                 {
 486                         printk(KERN_WARNING "broken BIOS!!\n");
 487                         polarity = 1;
 488                         break;
 489                 }
 490                 case 3: /* low active */
 491                 {
 492                         polarity = 1;
 493                         break;
 494                 }
 495                 default: /* invalid */
 496                 {
 497                         printk(KERN_WARNING "broken BIOS!!\n");
 498                         polarity = 1;
 499                         break;
 500                 }
 501         }
 502         return polarity;
 503 }
 504
 505 static int MPBIOS_trigger(int idx)
 506 {
 507         int bus = mp_irqs[idx].mpc_srcbus;
 508         int trigger;
 509
 510         /*
 511          * Determine IRQ trigger mode (edge or level sensitive):
 512          */
 513         switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
 514         {
 515                 case 0: /* conforms, ie. bus-type dependent */
 516                 {
 517                         switch (mp_bus_id_to_type[bus])
 518                         {
 519                                 case MP_BUS_ISA: /* ISA pin */
 520                                 {
 521                                         trigger = default_ISA_trigger(idx);
 522                                         break;
 523                                 }
 524                                 case MP_BUS_EISA: /* EISA pin */
 525                                 {
 526                                         trigger = default_EISA_trigger(idx);
 527                                         break;
 528                                 }
 529                                 case MP_BUS_PCI: /* PCI pin */
 530                                 {
 531                                         trigger = default_PCI_trigger(idx);
 532                                         break;
 533                                 }
 534                                 case MP_BUS_MCA: /* MCA pin */
 535                                 {
 536                                         trigger = default_MCA_trigger(idx);
 537                                         break;
 538                                 }
 539                                 default:
 540                                 {
 541                                         printk(KERN_WARNING "broken BIOS!!\n");
 542                                         trigger = 1;
 543                                         break;
 544                                 }
 545                         }
 546                         break;
 547                 }
 548                 case 1: /* edge */
 549                 {
 550                         trigger = 0;
 551                         break;
 552                 }
 553                 case 2: /* reserved */
 554                 {
 555                         printk(KERN_WARNING "broken BIOS!!\n");
 556                         trigger = 1;
 557                         break;
 558                 }
 559                 case 3: /* level */
 560                 {
 561                         trigger = 1;
 562                         break;
 563                 }
 564                 default: /* invalid */
 565                 {
 566                         printk(KERN_WARNING "broken BIOS!!\n");
 567                         trigger = 0;
 568                         break;
 569                 }
 570         }
 571         return trigger;
 572 }
 573
 574 static inline int irq_polarity(int idx)
 575 {
 576         return MPBIOS_polarity(idx);
 577 }
 578
 579 static inline int irq_trigger(int idx)
 580 {
 581         return MPBIOS_trigger(idx);
 582 }
 583
 584 static int pin_2_irq(int idx, int apic, int pin)
 585 {
 586         int irq, i;
 587         int bus = mp_irqs[idx].mpc_srcbus;
 588
 589         /*
 590          * Debugging check, we are in big trouble if this message pops up!
 591          */
 592         if (mp_irqs[idx].mpc_dstirq != pin)
 593                 printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
 594
 595         switch (mp_bus_id_to_type[bus])
 596         {
 597                 case MP_BUS_ISA: /* ISA pin */
 598                 case MP_BUS_EISA:
 599                 case MP_BUS_MCA:
 600                 {
 601                         irq = mp_irqs[idx].mpc_srcbusirq;
 602                         break;
 603                 }
 604                 case MP_BUS_PCI: /* PCI pin */
 605                 {
 606                         /*
 607                          * PCI IRQs are mapped in order
 608                          */
 609                         i = irq = 0;
 610                         while (i < apic)
 611                                 irq += nr_ioapic_registers[i++];
 612                         irq += pin;
 613                         break;
 614                 }
 615                 default:
 616                 {
 617                         printk(KERN_ERR "unknown bus type %d.\n",bus);
 618                         irq = 0;
 619                         break;
 620                 }
 621         }
 622
 623         /*
 624          * PCI IRQ command line redirection. Yes, limits are hardcoded.
 625          */
 626         if ((pin >= 16) && (pin <= 23)) {
 627                 if (pirq_entries[pin-16] != -1) {
 628                         if (!pirq_entries[pin-16]) {
 629                                 apic_printk(APIC_VERBOSE, "disabling PIRQ%d\n", pin-16);
 630                         } else {
 631                                 irq = pirq_entries[pin-16];
 632                                 apic_printk(APIC_VERBOSE, "using PIRQ%d -> IRQ %d\n",
 633                                                 pin-16, irq);
 634                         }
 635                 }
 636         }
 637         return irq;
 638 }
 639
 640 static inline int IO_APIC_irq_trigger(int irq)
 641 {
 642         int apic, idx, pin;
 643
 644         for (apic = 0; apic < nr_ioapics; apic++) {
 645                 for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
 646                         idx = find_irq_entry(apic,pin,mp_INT);
 647                         if ((idx != -1) && (irq == pin_2_irq(idx,apic,pin)))
 648                                 return irq_trigger(idx);
 649                 }
 650         }
 651         /*
 652          * nonexistent IRQs are edge default
 653          */
 654         return 0;
 655 }
 656
 657 /* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */
 658 u8 irq_vector[NR_IRQ_VECTORS] = { FIRST_DEVICE_VECTOR , 0 };
 659
 660 int assign_irq_vector(int irq)
 661 {
 662         static int current_vector = FIRST_DEVICE_VECTOR, offset = 0;
 663
 664         BUG_ON(irq >= NR_IRQ_VECTORS);
 665         if (IO_APIC_VECTOR(irq) > 0)
 666                 return IO_APIC_VECTOR(irq);
 667 next:
 668         current_vector += 8;
 669         if (current_vector == IA32_SYSCALL_VECTOR)
 670                 goto next;
 671
 672         if (current_vector >= FIRST_SYSTEM_VECTOR) {
 673                 offset++;
 674                 if (!(offset%8))
 675                         return -ENOSPC;
 676                 current_vector = FIRST_DEVICE_VECTOR + offset;
 677         }
 678
 679         vector_irq[current_vector] = irq;
 680         if (irq != AUTO_ASSIGN)
 681                 IO_APIC_VECTOR(irq) = current_vector;
 682
 683         return current_vector;
 684 }
 685
 686 extern void (*interrupt[NR_IRQS])(void);
 687 static struct hw_interrupt_type ioapic_level_type;
 688 static struct hw_interrupt_type ioapic_edge_type;
 689
 690 #define IOAPIC_AUTO     -1
 691 #define IOAPIC_EDGE     0
 692 #define IOAPIC_LEVEL    1
 693
 694 static inline void ioapic_register_intr(int irq, int vector, unsigned long trigger)
 695 {
 696         if (use_pci_vector() && !platform_legacy_irq(irq)) {
 697                 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
 698                                 trigger == IOAPIC_LEVEL)
 699                         irq_desc[vector].handler = &ioapic_level_type;
 700                 else
 701                         irq_desc[vector].handler = &ioapic_edge_type;
 702                 set_intr_gate(vector, interrupt[vector]);
 703         } else  {
 704                 if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
 705                                 trigger == IOAPIC_LEVEL)
 706                         irq_desc[irq].handler = &ioapic_level_type;
 707                 else
 708                         irq_desc[irq].handler = &ioapic_edge_type;
 709                 set_intr_gate(vector, interrupt[irq]);
 710         }
 711 }
 712
 713 static void __init setup_IO_APIC_irqs(void)
 714 {
 715         struct IO_APIC_route_entry entry;
 716         int apic, pin, idx, irq, first_notcon = 1, vector;
 717         unsigned long flags;
 718
 719         apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
 720
 721         for (apic = 0; apic < nr_ioapics; apic++) {
 722         for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
 723
 724                 /*
 725                  * add it to the IO-APIC irq-routing table:
 726                  */
 727                 memset(&entry,0,sizeof(entry));
 728
 729                 entry.delivery_mode = INT_DELIVERY_MODE;
 730                 entry.dest_mode = INT_DEST_MODE;
 731                 entry.mask = 0;                         /* enable IRQ */
 732                 entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
 733
 734                 idx = find_irq_entry(apic,pin,mp_INT);
 735                 if (idx == -1) {
 736                         if (first_notcon) {
 737                                 apic_printk(APIC_VERBOSE, KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mpc_apicid, pin);
 738                                 first_notcon = 0;
 739                         } else
 740                                 apic_printk(APIC_VERBOSE, ", %d-%d", mp_ioapics[apic].mpc_apicid, pin);
 741                         continue;
 742                 }
 743
 744                 entry.trigger = irq_trigger(idx);
 745                 entry.polarity = irq_polarity(idx);
 746
 747                 if (irq_trigger(idx)) {
 748                         entry.trigger = 1;
 749                         entry.mask = 1;
 750                         entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
 751                 }
 752
 753                 irq = pin_2_irq(idx, apic, pin);
 754                 add_pin_to_irq(irq, apic, pin);
 755
 756                 if (!apic && !IO_APIC_IRQ(irq))
 757                         continue;
 758
 759                 if (IO_APIC_IRQ(irq)) {
 760                         vector = assign_irq_vector(irq);
 761                         entry.vector = vector;
 762
 763                         ioapic_register_intr(irq, vector, IOAPIC_AUTO);
 764                         if (!apic && (irq < 16))
 765                                 disable_8259A_irq(irq);
 766                 }
 767                 spin_lock_irqsave(&ioapic_lock, flags);
 768                 io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
 769                 io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
 770                 spin_unlock_irqrestore(&ioapic_lock, flags);
 771         }
 772         }
 773
 774         if (!first_notcon)
 775                 apic_printk(APIC_VERBOSE," not connected.\n");
 776 }
 777
 778 /*
 779  * Set up the 8259A-master output pin as broadcast to all
 780  * CPUs.
 781  */
 782 static void __init setup_ExtINT_IRQ0_pin(unsigned int pin, int vector)
 783 {
 784         struct IO_APIC_route_entry entry;
 785         unsigned long flags;
 786
 787         memset(&entry,0,sizeof(entry));
 788
 789         disable_8259A_irq(0);
 790
 791         /* mask LVT0 */
 792         apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
 793
 794         /*
 795          * We use logical delivery to get the timer IRQ
 796          * to the first CPU.
 797          */
 798         entry.dest_mode = INT_DEST_MODE;
 799         entry.mask = 0;                                 /* unmask IRQ now */
 800         entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
 801         entry.delivery_mode = INT_DELIVERY_MODE;
 802         entry.polarity = 0;
 803         entry.trigger = 0;
 804         entry.vector = vector;
 805
 806         /*
 807          * The timer IRQ doesn't have to know that behind the
 808          * scene we have a 8259A-master in AEOI mode ...
 809          */
 810         irq_desc[0].handler = &ioapic_edge_type;
 811
 812         /*
 813          * Add it to the IO-APIC irq-routing table:
 814          */
 815         spin_lock_irqsave(&ioapic_lock, flags);
 816         io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1));
 817         io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0));
 818         spin_unlock_irqrestore(&ioapic_lock, flags);
 819
 820         enable_8259A_irq(0);
 821 }
 822
 823 void __init UNEXPECTED_IO_APIC(void)
 824 {
 825 }
 826
 827 void __apicdebuginit print_IO_APIC(void)
 828 {
 829         int apic, i;
 830         union IO_APIC_reg_00 reg_00;
 831         union IO_APIC_reg_01 reg_01;
 832         union IO_APIC_reg_02 reg_02;
 833         unsigned long flags;
 834
 835         if (apic_verbosity == APIC_QUIET)
 836                 return;
 837
 838         printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
 839         for (i = 0; i < nr_ioapics; i++)
 840                 printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
 841                        mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
 842
 843         /*
 844          * We are a bit conservative about what we expect.  We have to
 845          * know about every hardware change ASAP.
 846          */
 847         printk(KERN_INFO "testing the IO APIC.......................\n");
 848
 849         for (apic = 0; apic < nr_ioapics; apic++) {
 850
 851         spin_lock_irqsave(&ioapic_lock, flags);
 852         reg_00.raw = io_apic_read(apic, 0);
 853         reg_01.raw = io_apic_read(apic, 1);
 854         if (reg_01.bits.version >= 0x10)
 855                 reg_02.raw = io_apic_read(apic, 2);
 856         spin_unlock_irqrestore(&ioapic_lock, flags);
 857
 858         printk("\n");
 859         printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
 860         printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
 861         printk(KERN_DEBUG ".......    : physical APIC id: %02X\n", reg_00.bits.ID);
 862         if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2)
 863                 UNEXPECTED_IO_APIC();
 864
 865         printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)&reg_01);
 866         printk(KERN_DEBUG ".......     : max redirection entries: %04X\n", reg_01.bits.entries);
 867         if (    (reg_01.bits.entries != 0x0f) && /* older (Neptune) boards */
 868                 (reg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */
 869                 (reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */
 870                 (reg_01.bits.entries != 0x1f) && /* dual Xeon boards */
 871                 (reg_01.bits.entries != 0x22) && /* bigger Xeon boards */
 872                 (reg_01.bits.entries != 0x2E) &&
 873                 (reg_01.bits.entries != 0x3F) &&
 874                 (reg_01.bits.entries != 0x03)
 875         )
 876                 UNEXPECTED_IO_APIC();
 877
 878         printk(KERN_DEBUG ".......     : PRQ implemented: %X\n", reg_01.bits.PRQ);
 879         printk(KERN_DEBUG ".......     : IO APIC version: %04X\n", reg_01.bits.version);
 880         if (    (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */
 881                 (reg_01.bits.version != 0x02) && /* 82801BA IO-APICs (ICH2) */
 882                 (reg_01.bits.version != 0x10) && /* oldest IO-APICs */
 883                 (reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */
 884                 (reg_01.bits.version != 0x13) && /* Xeon IO-APICs */
 885                 (reg_01.bits.version != 0x20)    /* Intel P64H (82806 AA) */
 886         )
 887                 UNEXPECTED_IO_APIC();
 888         if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2)
 889                 UNEXPECTED_IO_APIC();
 890
 891         if (reg_01.bits.version >= 0x10) {
 892                 printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
 893                 printk(KERN_DEBUG ".......     : arbitration: %02X\n", reg_02.bits.arbitration);
 894                 if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2)
 895                         UNEXPECTED_IO_APIC();
 896         }
 897
 898         printk(KERN_DEBUG ".... IRQ redirection table:\n");
 899
 900         printk(KERN_DEBUG " NR Log Phy Mask Trig IRR Pol"
 901                           " Stat Dest Deli Vect:   \n");
 902
 903         for (i = 0; i <= reg_01.bits.entries; i++) {
 904                 struct IO_APIC_route_entry entry;
 905
 906                 spin_lock_irqsave(&ioapic_lock, flags);
 907                 *(((int *)&entry)+0) = io_apic_read(apic, 0x10+i*2);
 908                 *(((int *)&entry)+1) = io_apic_read(apic, 0x11+i*2);
 909                 spin_unlock_irqrestore(&ioapic_lock, flags);
 910
 911                 printk(KERN_DEBUG " %02x %03X %02X  ",
 912                         i,
 913                         entry.dest.logical.logical_dest,
 914                         entry.dest.physical.physical_dest
 915                 );
 916
 917                 printk("%1d    %1d    %1d   %1d   %1d    %1d    %1d    %02X\n",
 918                         entry.mask,
 919                         entry.trigger,
 920                         entry.irr,
 921                         entry.polarity,
 922                         entry.delivery_status,
 923                         entry.dest_mode,
 924                         entry.delivery_mode,
 925                         entry.vector
 926                 );
 927         }
 928         }
 929         if (use_pci_vector())
 930                 printk(KERN_INFO "Using vector-based indexing\n");
 931         printk(KERN_DEBUG "IRQ to pin mappings:\n");
 932         for (i = 0; i < NR_IRQS; i++) {
 933                 struct irq_pin_list *entry = irq_2_pin + i;
 934                 if (entry->pin < 0)
 935                         continue;
 936                 if (use_pci_vector() && !platform_legacy_irq(i))
 937                         printk(KERN_DEBUG "IRQ%d ", IO_APIC_VECTOR(i));
 938                 else
 939                         printk(KERN_DEBUG "IRQ%d ", i);
 940                 for (;;) {
 941                         printk("-> %d:%d", entry->apic, entry->pin);
 942                         if (!entry->next)
 943                                 break;
 944                         entry = irq_2_pin + entry->next;
 945                 }
 946                 printk("\n");
 947         }
 948
 949         printk(KERN_INFO ".................................... done.\n");
 950
 951         return;
 952 }
 953
 954 #if 0
 955
 956 static __apicdebuginit void print_APIC_bitfield (int base)
 957 {
 958         unsigned int v;
 959         int i, j;
 960
 961         if (apic_verbosity == APIC_QUIET)
 962                 return;
 963
 964         printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
 965         for (i = 0; i < 8; i++) {
 966                 v = apic_read(base + i*0x10);
 967                 for (j = 0; j < 32; j++) {
 968                         if (v & (1<<j))
 969                                 printk("1");
 970                         else
 971                                 printk("0");
 972                 }
 973                 printk("\n");
 974         }
 975 }
 976
 977 void __apicdebuginit print_local_APIC(void * dummy)
 978 {
 979         unsigned int v, ver, maxlvt;
 980
 981         if (apic_verbosity == APIC_QUIET)
 982                 return;
 983
 984         printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
 985                 smp_processor_id(), hard_smp_processor_id());
 986         v = apic_read(APIC_ID);
 987         printk(KERN_INFO "... APIC ID:      %08x (%01x)\n", v, GET_APIC_ID(v));
 988         v = apic_read(APIC_LVR);
 989         printk(KERN_INFO "... APIC VERSION: %08x\n", v);
 990         ver = GET_APIC_VERSION(v);
 991         maxlvt = get_maxlvt();
 992
 993         v = apic_read(APIC_TASKPRI);
 994         printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
 995
 996         if (APIC_INTEGRATED(ver)) {                     /* !82489DX */
 997                 v = apic_read(APIC_ARBPRI);
 998                 printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
 999                         v & APIC_ARBPRI_MASK);
1000                 v = apic_read(APIC_PROCPRI);
1001                 printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
1002         }
1003
1004         v = apic_read(APIC_EOI);
1005         printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
1006         v = apic_read(APIC_RRR);
1007         printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
1008         v = apic_read(APIC_LDR);
1009         printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
1010         v = apic_read(APIC_DFR);
1011         printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
1012         v = apic_read(APIC_SPIV);
1013         printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
1014
1015         printk(KERN_DEBUG "... APIC ISR field:\n");
1016         print_APIC_bitfield(APIC_ISR);
1017         printk(KERN_DEBUG "... APIC TMR field:\n");
1018         print_APIC_bitfield(APIC_TMR);
1019         printk(KERN_DEBUG "... APIC IRR field:\n");
1020         print_APIC_bitfield(APIC_IRR);
1021
1022         if (APIC_INTEGRATED(ver)) {             /* !82489DX */
1023                 if (maxlvt > 3)         /* Due to the Pentium erratum 3AP. */
1024                         apic_write(APIC_ESR, 0);
1025                 v = apic_read(APIC_ESR);
1026                 printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
1027         }
1028
1029         v = apic_read(APIC_ICR);
1030         printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
1031         v = apic_read(APIC_ICR2);
1032         printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
1033
1034         v = apic_read(APIC_LVTT);
1035         printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
1036
1037         if (maxlvt > 3) {                       /* PC is LVT#4. */
1038                 v = apic_read(APIC_LVTPC);
1039                 printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
1040         }
1041         v = apic_read(APIC_LVT0);
1042         printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
1043         v = apic_read(APIC_LVT1);
1044         printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
1045
1046         if (maxlvt > 2) {                       /* ERR is LVT#3. */
1047                 v = apic_read(APIC_LVTERR);
1048                 printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
1049         }
1050
1051         v = apic_read(APIC_TMICT);
1052         printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
1053         v = apic_read(APIC_TMCCT);
1054         printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
1055         v = apic_read(APIC_TDCR);
1056         printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
1057         printk("\n");
1058 }
1059
1060 void print_all_local_APICs (void)
1061 {
1062         on_each_cpu(print_local_APIC, NULL, 1, 1);
1063 }
1064
1065 void __apicdebuginit print_PIC(void)
1066 {
1067         unsigned int v;
1068         unsigned long flags;
1069
1070         if (apic_verbosity == APIC_QUIET)
1071                 return;
1072
1073         printk(KERN_DEBUG "\nprinting PIC contents\n");
1074
1075         spin_lock_irqsave(&i8259A_lock, flags);
1076
1077         v = inb(0xa1) << 8 | inb(0x21);
1078         printk(KERN_DEBUG "... PIC  IMR: %04x\n", v);
1079
1080         v = inb(0xa0) << 8 | inb(0x20);
1081         printk(KERN_DEBUG "... PIC  IRR: %04x\n", v);
1082
1083         outb(0x0b,0xa0);
1084         outb(0x0b,0x20);
1085         v = inb(0xa0) << 8 | inb(0x20);
1086         outb(0x0a,0xa0);
1087         outb(0x0a,0x20);
1088
1089         spin_unlock_irqrestore(&i8259A_lock, flags);
1090
1091         printk(KERN_DEBUG "... PIC  ISR: %04x\n", v);
1092
1093         v = inb(0x4d1) << 8 | inb(0x4d0);
1094         printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
1095 }
1096
1097 #endif  /*  0  */
1098
1099 static void __init enable_IO_APIC(void)
1100 {
1101         union IO_APIC_reg_01 reg_01;
1102         int i;
1103         unsigned long flags;
1104
1105         for (i = 0; i < PIN_MAP_SIZE; i++) {
1106                 irq_2_pin[i].pin = -1;
1107                 irq_2_pin[i].next = 0;
1108         }
1109         if (!pirqs_enabled)
1110                 for (i = 0; i < MAX_PIRQS; i++)
1111                         pirq_entries[i] = -1;
1112
1113         /*
1114          * The number of IO-APIC IRQ registers (== #pins):
1115          */
1116         for (i = 0; i < nr_ioapics; i++) {
1117                 spin_lock_irqsave(&ioapic_lock, flags);
1118                 reg_01.raw = io_apic_read(i, 1);
1119                 spin_unlock_irqrestore(&ioapic_lock, flags);
1120                 nr_ioapic_registers[i] = reg_01.bits.entries+1;
1121         }
1122
1123         /*
1124          * Do not trust the IO-APIC being empty at bootup
1125          */
1126         clear_IO_APIC();
1127 }
1128
1129 /*
1130  * Not an __init, needed by the reboot code
1131  */
1132 void disable_IO_APIC(void)
1133 {
1134         int pin;
1135         /*
1136          * Clear the IO-APIC before rebooting:
1137          */
1138         clear_IO_APIC();
1139
1140         /*
1141          * If the i82559 is routed through an IOAPIC
1142          * Put that IOAPIC in virtual wire mode
1143          * so legacy interrups can be delivered.
1144          */
1145         pin = find_isa_irq_pin(0, mp_ExtINT);
1146         if (pin != -1) {
1147                 struct IO_APIC_route_entry entry;
1148                 unsigned long flags;
1149
1150                 memset(&entry, 0, sizeof(entry));
1151                 entry.mask            = 0; /* Enabled */
1152                 entry.trigger         = 0; /* Edge */
1153                 entry.irr             = 0;
1154                 entry.polarity        = 0; /* High */
1155                 entry.delivery_status = 0;
1156                 entry.dest_mode       = 0; /* Physical */
1157                 entry.delivery_mode   = 7; /* ExtInt */
1158                 entry.vector          = 0;
1159                 entry.dest.physical.physical_dest = 0;
1160
1161
1162                 /*
1163                  * Add it to the IO-APIC irq-routing table:
1164                  */
1165                 spin_lock_irqsave(&ioapic_lock, flags);
1166                 io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1));
1167                 io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0));
1168                 spin_unlock_irqrestore(&ioapic_lock, flags);
1169         }
1170
1171         disconnect_bsp_APIC(pin != -1);
1172 }
1173
1174 /*
1175  * function to set the IO-APIC physical IDs based on the
1176  * values stored in the MPC table.
1177  *
1178  * by Matt Domsch <Matt_Domsch@dell.com>  Tue Dec 21 12:25:05 CST 1999
1179  */
1180
1181 static void __init setup_ioapic_ids_from_mpc (void)
1182 {
1183         union IO_APIC_reg_00 reg_00;
1184         int apic;
1185         int i;
1186         unsigned char old_id;
1187         unsigned long flags;
1188
1189         /*
1190          * Set the IOAPIC ID to the value stored in the MPC table.
1191          */
1192         for (apic = 0; apic < nr_ioapics; apic++) {
1193
1194                 /* Read the register 0 value */
1195                 spin_lock_irqsave(&ioapic_lock, flags);
1196                 reg_00.raw = io_apic_read(apic, 0);
1197                 spin_unlock_irqrestore(&ioapic_lock, flags);
1198
1199                 old_id = mp_ioapics[apic].mpc_apicid;
1200
1201
1202                 printk(KERN_INFO "Using IO-APIC %d\n", mp_ioapics[apic].mpc_apicid);
1203
1204
1205                 /*
1206                  * We need to adjust the IRQ routing table
1207                  * if the ID changed.
1208                  */
1209                 if (old_id != mp_ioapics[apic].mpc_apicid)
1210                         for (i = 0; i < mp_irq_entries; i++)
1211                                 if (mp_irqs[i].mpc_dstapic == old_id)
1212                                         mp_irqs[i].mpc_dstapic
1213                                                 = mp_ioapics[apic].mpc_apicid;
1214
1215                 /*
1216                  * Read the right value from the MPC table and
1217                  * write it into the ID register.
1218                  */
1219                 apic_printk(APIC_VERBOSE,KERN_INFO "...changing IO-APIC physical APIC ID to %d ...",
1220                                 mp_ioapics[apic].mpc_apicid);
1221
1222                 reg_00.bits.ID = mp_ioapics[apic].mpc_apicid;
1223                 spin_lock_irqsave(&ioapic_lock, flags);
1224                 io_apic_write(apic, 0, reg_00.raw);
1225                 spin_unlock_irqrestore(&ioapic_lock, flags);
1226
1227                 /*
1228                  * Sanity check
1229                  */
1230                 spin_lock_irqsave(&ioapic_lock, flags);
1231                 reg_00.raw = io_apic_read(apic, 0);
1232                 spin_unlock_irqrestore(&ioapic_lock, flags);
1233                 if (reg_00.bits.ID != mp_ioapics[apic].mpc_apicid)
1234                         printk("could not set ID!\n");
1235                 else
1236                         apic_printk(APIC_VERBOSE," ok.\n");
1237         }
1238 }
1239
1240 /*
1241  * There is a nasty bug in some older SMP boards, their mptable lies
1242  * about the timer IRQ. We do the following to work around the situation:
1243  *
1244  *      - timer IRQ defaults to IO-APIC IRQ
1245  *      - if this function detects that timer IRQs are defunct, then we fall
1246  *        back to ISA timer IRQs
1247  */
1248 static int __init timer_irq_works(void)
1249 {
1250         unsigned long t1 = jiffies;
1251
1252         local_irq_enable();
1253         /* Let ten ticks pass... */
1254         mdelay((10 * 1000) / HZ);
1255
1256         /*
1257          * Expect a few ticks at least, to be sure some possible
1258          * glue logic does not lock up after one or two first
1259          * ticks in a non-ExtINT mode.  Also the local APIC
1260          * might have cached one ExtINT interrupt.  Finally, at
1261          * least one tick may be lost due to delays.
1262          */
1263
1264         /* jiffies wrap? */
1265         if (jiffies - t1 > 4)
1266                 return 1;
1267         return 0;
1268 }
1269
1270 /*
1271  * In the SMP+IOAPIC case it might happen that there are an unspecified
1272  * number of pending IRQ events unhandled. These cases are very rare,
1273  * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
1274  * better to do it this way as thus we do not have to be aware of
1275  * 'pending' interrupts in the IRQ path, except at this point.
1276  */
1277 /*
1278  * Edge triggered needs to resend any interrupt
1279  * that was delayed but this is now handled in the device
1280  * independent code.
1281  */
1282
1283 /*
1284  * Starting up a edge-triggered IO-APIC interrupt is
1285  * nasty - we need to make sure that we get the edge.
1286  * If it is already asserted for some reason, we need
1287  * return 1 to indicate that is was pending.
1288  *
1289  * This is not complete - we should be able to fake
1290  * an edge even if it isn't on the 8259A...
1291  */
1292
1293 static unsigned int startup_edge_ioapic_irq(unsigned int irq)
1294 {
1295         int was_pending = 0;
1296         unsigned long flags;
1297
1298         spin_lock_irqsave(&ioapic_lock, flags);
1299         if (irq < 16) {
1300                 disable_8259A_irq(irq);
1301                 if (i8259A_irq_pending(irq))
1302                         was_pending = 1;
1303         }
1304         __unmask_IO_APIC_irq(irq);
1305         spin_unlock_irqrestore(&ioapic_lock, flags);
1306
1307         return was_pending;
1308 }
1309
1310 /*
1311  * Once we have recorded IRQ_PENDING already, we can mask the
1312  * interrupt for real. This prevents IRQ storms from unhandled
1313  * devices.
1314  */
1315 static void ack_edge_ioapic_irq(unsigned int irq)
1316 {
1317         if ((irq_desc[irq].status & (IRQ_PENDING | IRQ_DISABLED))
1318                                         == (IRQ_PENDING | IRQ_DISABLED))
1319                 mask_IO_APIC_irq(irq);
1320         ack_APIC_irq();
1321 }
1322
1323 /*
1324  * Level triggered interrupts can just be masked,
1325  * and shutting down and starting up the interrupt
1326  * is the same as enabling and disabling them -- except
1327  * with a startup need to return a "was pending" value.
1328  *
1329  * Level triggered interrupts are special because we
1330  * do not touch any IO-APIC register while handling
1331  * them. We ack the APIC in the end-IRQ handler, not
1332  * in the start-IRQ-handler. Protection against reentrance
1333  * from the same interrupt is still provided, both by the
1334  * generic IRQ layer and by the fact that an unacked local
1335  * APIC does not accept IRQs.
1336  */
1337 static unsigned int startup_level_ioapic_irq (unsigned int irq)
1338 {
1339         unmask_IO_APIC_irq(irq);
1340
1341         return 0; /* don't check for pending */
1342 }
1343
1344 static void end_level_ioapic_irq (unsigned int irq)
1345 {
1346         ack_APIC_irq();
1347 }
1348
1349 static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
1350 {
1351         unsigned long flags;
1352         unsigned int dest;
1353
1354         dest = cpu_mask_to_apicid(mask);
1355
1356         /*
1357          * Only the high 8 bits are valid.
1358          */
1359         dest = SET_APIC_LOGICAL_ID(dest);
1360
1361         spin_lock_irqsave(&ioapic_lock, flags);
1362         __DO_ACTION(1, = dest, )
1363         spin_unlock_irqrestore(&ioapic_lock, flags);
1364 }
1365
1366 #ifdef CONFIG_PCI_MSI
1367 static unsigned int startup_edge_ioapic_vector(unsigned int vector)
1368 {
1369         int irq = vector_to_irq(vector);
1370
1371         return startup_edge_ioapic_irq(irq);
1372 }
1373
1374 static void ack_edge_ioapic_vector(unsigned int vector)
1375 {
1376         int irq = vector_to_irq(vector);
1377
1378         ack_edge_ioapic_irq(irq);
1379 }
1380
1381 static unsigned int startup_level_ioapic_vector (unsigned int vector)
1382 {
1383         int irq = vector_to_irq(vector);
1384
1385         return startup_level_ioapic_irq (irq);
1386 }
1387
1388 static void end_level_ioapic_vector (unsigned int vector)
1389 {
1390         int irq = vector_to_irq(vector);
1391
1392         end_level_ioapic_irq(irq);
1393 }
1394
1395 static void mask_IO_APIC_vector (unsigned int vector)
1396 {
1397         int irq = vector_to_irq(vector);
1398
1399         mask_IO_APIC_irq(irq);
1400 }
1401
1402 static void unmask_IO_APIC_vector (unsigned int vector)
1403 {
1404         int irq = vector_to_irq(vector);
1405
1406         unmask_IO_APIC_irq(irq);
1407 }
1408
1409 static void set_ioapic_affinity_vector (unsigned int vector,
1410                                         cpumask_t cpu_mask)
1411 {
1412         int irq = vector_to_irq(vector);
1413
1414         set_ioapic_affinity_irq(irq, cpu_mask);
1415 }
1416 #endif
1417
1418 /*
1419  * Level and edge triggered IO-APIC interrupts need different handling,
1420  * so we use two separate IRQ descriptors. Edge triggered IRQs can be
1421  * handled with the level-triggered descriptor, but that one has slightly
1422  * more overhead. Level-triggered interrupts cannot be handled with the
1423  * edge-triggered handler, without risking IRQ storms and other ugly
1424  * races.
1425  */
1426
1427 static struct hw_interrupt_type ioapic_edge_type = {
1428         .typename = "IO-APIC-edge",
1429         .startup        = startup_edge_ioapic,
1430         .shutdown       = shutdown_edge_ioapic,
1431         .enable         = enable_edge_ioapic,
1432         .disable        = disable_edge_ioapic,
1433         .ack            = ack_edge_ioapic,
1434         .end            = end_edge_ioapic,
1435         .set_affinity = set_ioapic_affinity,
1436 };
1437
1438 static struct hw_interrupt_type ioapic_level_type = {
1439         .typename = "IO-APIC-level",
1440         .startup        = startup_level_ioapic,
1441         .shutdown       = shutdown_level_ioapic,
1442         .enable         = enable_level_ioapic,
1443         .disable        = disable_level_ioapic,
1444         .ack            = mask_and_ack_level_ioapic,
1445         .end            = end_level_ioapic,
1446         .set_affinity = set_ioapic_affinity,
1447 };
1448
1449 static inline void init_IO_APIC_traps(void)
1450 {
1451         int irq;
1452
1453         /*
1454          * NOTE! The local APIC isn't very good at handling
1455          * multiple interrupts at the same interrupt level.
1456          * As the interrupt level is determined by taking the
1457          * vector number and shifting that right by 4, we
1458          * want to spread these out a bit so that they don't
1459          * all fall in the same interrupt level.
1460          *
1461          * Also, we've got to be careful not to trash gate
1462          * 0x80, because int 0x80 is hm, kind of importantish. ;)
1463          */
1464         for (irq = 0; irq < NR_IRQS ; irq++) {
1465                 int tmp = irq;
1466                 if (use_pci_vector()) {
1467                         if (!platform_legacy_irq(tmp))
1468                                 if ((tmp = vector_to_irq(tmp)) == -1)
1469                                         continue;
1470                 }
1471                 if (IO_APIC_IRQ(tmp) && !IO_APIC_VECTOR(tmp)) {
1472                         /*
1473                          * Hmm.. We don't have an entry for this,
1474                          * so default to an old-fashioned 8259
1475                          * interrupt if we can..
1476                          */
1477                         if (irq < 16)
1478                                 make_8259A_irq(irq);
1479                         else
1480                                 /* Strange. Oh, well.. */
1481                                 irq_desc[irq].handler = &no_irq_type;
1482                 }
1483         }
1484 }
1485
1486 static void enable_lapic_irq (unsigned int irq)
1487 {
1488         unsigned long v;
1489
1490         v = apic_read(APIC_LVT0);
1491         apic_write_around(APIC_LVT0, v & ~APIC_LVT_MASKED);
1492 }
1493
1494 static void disable_lapic_irq (unsigned int irq)
1495 {
1496         unsigned long v;
1497
1498         v = apic_read(APIC_LVT0);
1499         apic_write_around(APIC_LVT0, v | APIC_LVT_MASKED);
1500 }
1501
1502 static void ack_lapic_irq (unsigned int irq)
1503 {
1504         ack_APIC_irq();
1505 }
1506
1507 static void end_lapic_irq (unsigned int i) { /* nothing */ }
1508
1509 static struct hw_interrupt_type lapic_irq_type = {
1510         .typename = "local-APIC-edge",
1511         .startup = NULL, /* startup_irq() not used for IRQ0 */
1512         .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
1513         .enable = enable_lapic_irq,
1514         .disable = disable_lapic_irq,
1515         .ack = ack_lapic_irq,
1516         .end = end_lapic_irq,
1517 };
1518
1519 static void setup_nmi (void)
1520 {
1521         /*
1522          * Dirty trick to enable the NMI watchdog ...
1523          * We put the 8259A master into AEOI mode and
1524          * unmask on all local APICs LVT0 as NMI.
1525          *
1526          * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
1527          * is from Maciej W. Rozycki - so we do not have to EOI from
1528          * the NMI handler or the timer interrupt.
1529          */
1530         printk(KERN_INFO "activating NMI Watchdog ...");
1531
1532         enable_NMI_through_LVT0(NULL);
1533
1534         printk(" done.\n");
1535 }
1536
1537 /*
1538  * This looks a bit hackish but it's about the only one way of sending
1539  * a few INTA cycles to 8259As and any associated glue logic.  ICR does
1540  * not support the ExtINT mode, unfortunately.  We need to send these
1541  * cycles as some i82489DX-based boards have glue logic that keeps the
1542  * 8259A interrupt line asserted until INTA.  --macro
1543  */
1544 static inline void unlock_ExtINT_logic(void)
1545 {
1546         int pin, i;
1547         struct IO_APIC_route_entry entry0, entry1;
1548         unsigned char save_control, save_freq_select;
1549         unsigned long flags;
1550
1551         pin = find_isa_irq_pin(8, mp_INT);
1552         if (pin == -1)
1553                 return;
1554
1555         spin_lock_irqsave(&ioapic_lock, flags);
1556         *(((int *)&entry0) + 1) = io_apic_read(0, 0x11 + 2 * pin);
1557         *(((int *)&entry0) + 0) = io_apic_read(0, 0x10 + 2 * pin);
1558         spin_unlock_irqrestore(&ioapic_lock, flags);
1559         clear_IO_APIC_pin(0, pin);
1560
1561         memset(&entry1, 0, sizeof(entry1));
1562
1563         entry1.dest_mode = 0;                   /* physical delivery */
1564         entry1.mask = 0;                        /* unmask IRQ now */
1565         entry1.dest.physical.physical_dest = hard_smp_processor_id();
1566         entry1.delivery_mode = dest_ExtINT;
1567         entry1.polarity = entry0.polarity;
1568         entry1.trigger = 0;
1569         entry1.vector = 0;
1570
1571         spin_lock_irqsave(&ioapic_lock, flags);
1572         io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
1573         io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
1574         spin_unlock_irqrestore(&ioapic_lock, flags);
1575
1576         save_control = CMOS_READ(RTC_CONTROL);
1577         save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
1578         CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
1579                    RTC_FREQ_SELECT);
1580         CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
1581
1582         i = 100;
1583         while (i-- > 0) {
1584                 mdelay(10);
1585                 if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
1586                         i -= 10;
1587         }
1588
1589         CMOS_WRITE(save_control, RTC_CONTROL);
1590         CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
1591         clear_IO_APIC_pin(0, pin);
1592
1593         spin_lock_irqsave(&ioapic_lock, flags);
1594         io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
1595         io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
1596         spin_unlock_irqrestore(&ioapic_lock, flags);
1597 }
1598
1599 /*
1600  * This code may look a bit paranoid, but it's supposed to cooperate with
1601  * a wide range of boards and BIOS bugs.  Fortunately only the timer IRQ
1602  * is so screwy.  Thanks to Brian Perkins for testing/hacking this beast
1603  * fanatically on his truly buggy board.
1604  */
1605 static inline void check_timer(void)
1606 {
1607         int pin1, pin2;
1608         int vector;
1609
1610         /*
1611          * get/set the timer IRQ vector:
1612          */
1613         disable_8259A_irq(0);
1614         vector = assign_irq_vector(0);
1615         set_intr_gate(vector, interrupt[0]);
1616
1617         /*
1618          * Subtle, code in do_timer_interrupt() expects an AEOI
1619          * mode for the 8259A whenever interrupts are routed
1620          * through I/O APICs.  Also IRQ0 has to be enabled in
1621          * the 8259A which implies the virtual wire has to be
1622          * disabled in the local APIC.
1623          */
1624         apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
1625         init_8259A(1);
1626         enable_8259A_irq(0);
1627
1628         pin1 = find_isa_irq_pin(0, mp_INT);
1629         pin2 = find_isa_irq_pin(0, mp_ExtINT);
1630
1631         apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X pin1=%d pin2=%d\n", vector, pin1, pin2);
1632
1633         if (pin1 != -1) {
1634                 /*
1635                  * Ok, does IRQ0 through the IOAPIC work?
1636                  */
1637                 unmask_IO_APIC_irq(0);
1638                 if (!no_timer_check && timer_irq_works()) {
1639                         nmi_watchdog_default();
1640                         if (nmi_watchdog == NMI_IO_APIC) {
1641                                 disable_8259A_irq(0);
1642                                 setup_nmi();
1643                                 enable_8259A_irq(0);
1644                         }
1645                         return;
1646                 }
1647                 clear_IO_APIC_pin(0, pin1);
1648                 apic_printk(APIC_QUIET,KERN_ERR "..MP-BIOS bug: 8254 timer not connected to IO-APIC\n");
1649         }
1650
1651         apic_printk(APIC_VERBOSE,KERN_INFO "...trying to set up timer (IRQ0) through the 8259A ... ");
1652         if (pin2 != -1) {
1653                 apic_printk(APIC_VERBOSE,"\n..... (found pin %d) ...", pin2);
1654                 /*
1655                  * legacy devices should be connected to IO APIC #0
1656                  */
1657                 setup_ExtINT_IRQ0_pin(pin2, vector);
1658                 if (timer_irq_works()) {
1659                         printk("works.\n");
1660                         nmi_watchdog_default();
1661                         if (nmi_watchdog == NMI_IO_APIC) {
1662                                 setup_nmi();
1663                         }
1664                         return;
1665                 }
1666                 /*
1667                  * Cleanup, just in case ...
1668                  */
1669                 clear_IO_APIC_pin(0, pin2);
1670         }
1671         printk(" failed.\n");
1672
1673         if (nmi_watchdog) {
1674                 printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
1675                 nmi_watchdog = 0;
1676         }
1677
1678         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
1679
1680         disable_8259A_irq(0);
1681         irq_desc[0].handler = &lapic_irq_type;
1682         apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector);   /* Fixed mode */
1683         enable_8259A_irq(0);
1684
1685         if (timer_irq_works()) {
1686                 apic_printk(APIC_QUIET, " works.\n");
1687                 return;
1688         }
1689         apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector);
1690         apic_printk(APIC_VERBOSE," failed.\n");
1691
1692         apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as ExtINT IRQ...");
1693
1694         init_8259A(0);
1695         make_8259A_irq(0);
1696         apic_write_around(APIC_LVT0, APIC_DM_EXTINT);
1697
1698         unlock_ExtINT_logic();
1699
1700         if (timer_irq_works()) {
1701                 apic_printk(APIC_VERBOSE," works.\n");
1702                 return;
1703         }
1704         apic_printk(APIC_VERBOSE," failed :(.\n");
1705         panic("IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter\n");
1706 }
1707
1708 static int __init notimercheck(char *s)
1709 {
1710         no_timer_check = 1;
1711         return 1;
1712 }
1713 __setup("no_timer_check", notimercheck);
1714
1715 /*
1716  *
1717  * IRQ's that are handled by the PIC in the MPS IOAPIC case.
1718  * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
1719  *   Linux doesn't really care, as it's not actually used
1720  *   for any interrupt handling anyway.
1721  */
1722 #define PIC_IRQS        (1<<2)
1723
1724 void __init setup_IO_APIC(void)
1725 {
1726         enable_IO_APIC();
1727
1728         if (acpi_ioapic)
1729                 io_apic_irqs = ~0;      /* all IRQs go through IOAPIC */
1730         else
1731                 io_apic_irqs = ~PIC_IRQS;
1732
1733         apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
1734
1735         /*
1736          * Set up the IO-APIC IRQ routing table.
1737          */
1738         if (!acpi_ioapic)
1739                 setup_ioapic_ids_from_mpc();
1740         sync_Arb_IDs();
1741         setup_IO_APIC_irqs();
1742         init_IO_APIC_traps();
1743         check_timer();
1744         if (!acpi_ioapic)
1745                 print_IO_APIC();
1746 }
1747
1748 struct sysfs_ioapic_data {
1749         struct sys_device dev;
1750         struct IO_APIC_route_entry entry[0];
1751 };
1752 static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
1753
1754 static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
1755 {
1756         struct IO_APIC_route_entry *entry;
1757         struct sysfs_ioapic_data *data;
1758         unsigned long flags;
1759         int i;
1760
1761         data = container_of(dev, struct sysfs_ioapic_data, dev);
1762         entry = data->entry;
1763         spin_lock_irqsave(&ioapic_lock, flags);
1764         for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) {
1765                 *(((int *)entry) + 1) = io_apic_read(dev->id, 0x11 + 2 * i);
1766                 *(((int *)entry) + 0) = io_apic_read(dev->id, 0x10 + 2 * i);
1767         }
1768         spin_unlock_irqrestore(&ioapic_lock, flags);
1769
1770         return 0;
1771 }
1772
1773 static int ioapic_resume(struct sys_device *dev)
1774 {
1775         struct IO_APIC_route_entry *entry;
1776         struct sysfs_ioapic_data *data;
1777         unsigned long flags;
1778         union IO_APIC_reg_00 reg_00;
1779         int i;
1780
1781         data = container_of(dev, struct sysfs_ioapic_data, dev);
1782         entry = data->entry;
1783
1784         spin_lock_irqsave(&ioapic_lock, flags);
1785         reg_00.raw = io_apic_read(dev->id, 0);
1786         if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
1787                 reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
1788                 io_apic_write(dev->id, 0, reg_00.raw);
1789         }
1790         for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) {
1791                 io_apic_write(dev->id, 0x11+2*i, *(((int *)entry)+1));
1792                 io_apic_write(dev->id, 0x10+2*i, *(((int *)entry)+0));
1793         }
1794         spin_unlock_irqrestore(&ioapic_lock, flags);
1795
1796         return 0;
1797 }
1798
1799 static struct sysdev_class ioapic_sysdev_class = {
1800         set_kset_name("ioapic"),
1801         .suspend = ioapic_suspend,
1802         .resume = ioapic_resume,
1803 };
1804
1805 static int __init ioapic_init_sysfs(void)
1806 {
1807         struct sys_device * dev;
1808         int i, size, error = 0;
1809
1810         error = sysdev_class_register(&ioapic_sysdev_class);
1811         if (error)
1812                 return error;
1813
1814         for (i = 0; i < nr_ioapics; i++ ) {
1815                 size = sizeof(struct sys_device) + nr_ioapic_registers[i]
1816                         * sizeof(struct IO_APIC_route_entry);
1817                 mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL);
1818                 if (!mp_ioapic_data[i]) {
1819                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1820                         continue;
1821                 }
1822                 memset(mp_ioapic_data[i], 0, size);
1823                 dev = &mp_ioapic_data[i]->dev;
1824                 dev->id = i;
1825                 dev->cls = &ioapic_sysdev_class;
1826                 error = sysdev_register(dev);
1827                 if (error) {
1828                         kfree(mp_ioapic_data[i]);
1829                         mp_ioapic_data[i] = NULL;
1830                         printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
1831                         continue;
1832                 }
1833         }
1834
1835         return 0;
1836 }
1837
1838 device_initcall(ioapic_init_sysfs);
1839
1840 /* --------------------------------------------------------------------------
1841                           ACPI-based IOAPIC Configuration
1842    -------------------------------------------------------------------------- */
1843
1844 #ifdef CONFIG_ACPI_BOOT
1845
1846 #define IO_APIC_MAX_ID          0xFE
1847
1848 int __init io_apic_get_version (int ioapic)
1849 {
1850         union IO_APIC_reg_01    reg_01;
1851         unsigned long flags;
1852
1853         spin_lock_irqsave(&ioapic_lock, flags);
1854         reg_01.raw = io_apic_read(ioapic, 1);
1855         spin_unlock_irqrestore(&ioapic_lock, flags);
1856
1857         return reg_01.bits.version;
1858 }
1859
1860
1861 int __init io_apic_get_redir_entries (int ioapic)
1862 {
1863         union IO_APIC_reg_01    reg_01;
1864         unsigned long flags;
1865
1866         spin_lock_irqsave(&ioapic_lock, flags);
1867         reg_01.raw = io_apic_read(ioapic, 1);
1868         spin_unlock_irqrestore(&ioapic_lock, flags);
1869
1870         return reg_01.bits.entries;
1871 }
1872
1873
1874 int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low)
1875 {
1876         struct IO_APIC_route_entry entry;
1877         unsigned long flags;
1878
1879         if (!IO_APIC_IRQ(irq)) {
1880                 apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
1881                         ioapic);
1882                 return -EINVAL;
1883         }
1884
1885         /*
1886          * Generate a PCI IRQ routing entry and program the IOAPIC accordingly.
1887          * Note that we mask (disable) IRQs now -- these get enabled when the
1888          * corresponding device driver registers for this IRQ.
1889          */
1890
1891         memset(&entry,0,sizeof(entry));
1892
1893         entry.delivery_mode = INT_DELIVERY_MODE;
1894         entry.dest_mode = INT_DEST_MODE;
1895         entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
1896         entry.trigger = edge_level;
1897         entry.polarity = active_high_low;
1898         entry.mask = 1;                                  /* Disabled (masked) */
1899
1900         /*
1901          * IRQs < 16 are already in the irq_2_pin[] map
1902          */
1903         if (irq >= 16)
1904                 add_pin_to_irq(irq, ioapic, pin);
1905
1906         entry.vector = assign_irq_vector(irq);
1907
1908         apic_printk(APIC_VERBOSE,KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry (%d-%d -> 0x%x -> "
1909                 "IRQ %d Mode:%i Active:%i)\n", ioapic,
1910                mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq,
1911                edge_level, active_high_low);
1912
1913         ioapic_register_intr(irq, entry.vector, edge_level);
1914
1915         if (!ioapic && (irq < 16))
1916                 disable_8259A_irq(irq);
1917
1918         spin_lock_irqsave(&ioapic_lock, flags);
1919         io_apic_write(ioapic, 0x11+2*pin, *(((int *)&entry)+1));
1920         io_apic_write(ioapic, 0x10+2*pin, *(((int *)&entry)+0));
1921         spin_unlock_irqrestore(&ioapic_lock, flags);
1922
1923         return 0;
1924 }
1925
1926 #endif /*CONFIG_ACPI_BOOT*/
1927
1928
1929 /*
1930  * This function currently is only a helper for the i386 smp boot process where
1931  * we need to reprogram the ioredtbls to cater for the cpus which have come online
1932  * so mask in all cases should simply be TARGET_CPUS
1933  */
1934 void __init setup_ioapic_dest(void)
1935 {
1936         int pin, ioapic, irq, irq_entry;
1937
1938         if (skip_ioapic_setup == 1)
1939                 return;
1940
1941         for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
1942                 for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
1943                         irq_entry = find_irq_entry(ioapic, pin, mp_INT);
1944                         if (irq_entry == -1)
1945                                 continue;
1946                         irq = pin_2_irq(irq_entry, ioapic, pin);
1947                         set_ioapic_affinity_irq(irq, TARGET_CPUS);
1948                 }
1949
1950         }
1951 }