arch/x86/kernel/mpparse.c

   1 /*
   2  *      Intel Multiprocessor Specification 1.1 and 1.4
   3  *      compliant MP-table parsing routines.
   4  *
   5  *      (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk>
   6  *      (c) 1998, 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com>
   7  *      (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
   8  */
   9
  10 #include <linux/mm.h>
  11 #include <linux/init.h>
  12 #include <linux/delay.h>
  13 #include <linux/bootmem.h>
  14 #include <linux/kernel_stat.h>
  15 #include <linux/mc146818rtc.h>
  16 #include <linux/bitops.h>
  17 #include <linux/acpi.h>
  18 #include <linux/module.h>
  19 #include <linux/smp.h>
  20
  21 #include <asm/mtrr.h>
  22 #include <asm/mpspec.h>
  23 #include <asm/pgalloc.h>
  24 #include <asm/io_apic.h>
  25 #include <asm/proto.h>
  26 #include <asm/bios_ebda.h>
  27 #include <asm/e820.h>
  28 #include <asm/trampoline.h>
  29 #include <asm/setup.h>
  30 #include <asm/smp.h>
  31
  32 #include <asm/apic.h>
  33 /*
  34  * Checksum an MP configuration block.
  35  */
  36
  37 static int __init mpf_checksum(unsigned char *mp, int len)
  38 {
  39         int sum = 0;
  40
  41         while (len--)
  42                 sum += *mp++;
  43
  44         return sum & 0xFF;
  45 }
  46
  47 static void __init MP_processor_info(struct mpc_cpu *m)
  48 {
  49         int apicid;
  50         char *bootup_cpu = "";
  51
  52         if (!(m->cpuflag & CPU_ENABLED)) {
  53                 disabled_cpus++;
  54                 return;
  55         }
  56
  57         if (x86_quirks->mpc_apic_id)
  58                 apicid = x86_quirks->mpc_apic_id(m);
  59         else
  60                 apicid = m->apicid;
  61
  62         if (m->cpuflag & CPU_BOOTPROCESSOR) {
  63                 bootup_cpu = " (Bootup-CPU)";
  64                 boot_cpu_physical_apicid = m->apicid;
  65         }
  66
  67         printk(KERN_INFO "Processor #%d%s\n", m->apicid, bootup_cpu);
  68         generic_processor_info(apicid, m->apicver);
  69 }
  70
  71 #ifdef CONFIG_X86_IO_APIC
  72 static void __init MP_bus_info(struct mpc_bus *m)
  73 {
  74         char str[7];
  75         memcpy(str, m->bustype, 6);
  76         str[6] = 0;
  77
  78         if (x86_quirks->mpc_oem_bus_info)
  79                 x86_quirks->mpc_oem_bus_info(m, str);
  80         else
  81                 apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
  82
  83 #if MAX_MP_BUSSES < 256
  84         if (m->busid >= MAX_MP_BUSSES) {
  85                 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
  86                        " is too large, max. supported is %d\n",
  87                        m->busid, str, MAX_MP_BUSSES - 1);
  88                 return;
  89         }
  90 #endif
  91
  92         if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
  93                 set_bit(m->busid, mp_bus_not_pci);
  94 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
  95                 mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
  96 #endif
  97         } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
  98                 if (x86_quirks->mpc_oem_pci_bus)
  99                         x86_quirks->mpc_oem_pci_bus(m);
 100
 101                 clear_bit(m->busid, mp_bus_not_pci);
 102 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
 103                 mp_bus_id_to_type[m->busid] = MP_BUS_PCI;
 104         } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
 105                 mp_bus_id_to_type[m->busid] = MP_BUS_EISA;
 106         } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
 107                 mp_bus_id_to_type[m->busid] = MP_BUS_MCA;
 108 #endif
 109         } else
 110                 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
 111 }
 112 #endif
 113
 114 #ifdef CONFIG_X86_IO_APIC
 115
 116 static int bad_ioapic(unsigned long address)
 117 {
 118         if (nr_ioapics >= MAX_IO_APICS) {
 119                 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
 120                        "(found %d)\n", MAX_IO_APICS, nr_ioapics);
 121                 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
 122         }
 123         if (!address) {
 124                 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
 125                        " found in table, skipping!\n");
 126                 return 1;
 127         }
 128         return 0;
 129 }
 130
 131 static void __init MP_ioapic_info(struct mpc_ioapic *m)
 132 {
 133         if (!(m->flags & MPC_APIC_USABLE))
 134                 return;
 135
 136         printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
 137                m->apicid, m->apicver, m->apicaddr);
 138
 139         if (bad_ioapic(m->apicaddr))
 140                 return;
 141
 142         mp_ioapics[nr_ioapics].apicaddr = m->apicaddr;
 143         mp_ioapics[nr_ioapics].apicid = m->apicid;
 144         mp_ioapics[nr_ioapics].type = m->type;
 145         mp_ioapics[nr_ioapics].apicver = m->apicver;
 146         mp_ioapics[nr_ioapics].flags = m->flags;
 147         nr_ioapics++;
 148 }
 149
 150 static void print_MP_intsrc_info(struct mpc_intsrc *m)
 151 {
 152         apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
 153                 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
 154                 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
 155                 m->srcbusirq, m->dstapic, m->dstirq);
 156 }
 157
 158 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
 159 {
 160         apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
 161                 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
 162                 mp_irq->irqtype, mp_irq->irqflag & 3,
 163                 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
 164                 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
 165 }
 166
 167 static void __init assign_to_mp_irq(struct mpc_intsrc *m,
 168                                     struct mpc_intsrc *mp_irq)
 169 {
 170         mp_irq->dstapic = m->dstapic;
 171         mp_irq->type = m->type;
 172         mp_irq->irqtype = m->irqtype;
 173         mp_irq->irqflag = m->irqflag;
 174         mp_irq->srcbus = m->srcbus;
 175         mp_irq->srcbusirq = m->srcbusirq;
 176         mp_irq->dstirq = m->dstirq;
 177 }
 178
 179 static void __init assign_to_mpc_intsrc(struct mpc_intsrc *mp_irq,
 180                                         struct mpc_intsrc *m)
 181 {
 182         m->dstapic = mp_irq->dstapic;
 183         m->type = mp_irq->type;
 184         m->irqtype = mp_irq->irqtype;
 185         m->irqflag = mp_irq->irqflag;
 186         m->srcbus = mp_irq->srcbus;
 187         m->srcbusirq = mp_irq->srcbusirq;
 188         m->dstirq = mp_irq->dstirq;
 189 }
 190
 191 static int __init mp_irq_mpc_intsrc_cmp(struct mpc_intsrc *mp_irq,
 192                                         struct mpc_intsrc *m)
 193 {
 194         if (mp_irq->dstapic != m->dstapic)
 195                 return 1;
 196         if (mp_irq->type != m->type)
 197                 return 2;
 198         if (mp_irq->irqtype != m->irqtype)
 199                 return 3;
 200         if (mp_irq->irqflag != m->irqflag)
 201                 return 4;
 202         if (mp_irq->srcbus != m->srcbus)
 203                 return 5;
 204         if (mp_irq->srcbusirq != m->srcbusirq)
 205                 return 6;
 206         if (mp_irq->dstirq != m->dstirq)
 207                 return 7;
 208
 209         return 0;
 210 }
 211
 212 static void __init MP_intsrc_info(struct mpc_intsrc *m)
 213 {
 214         int i;
 215
 216         print_MP_intsrc_info(m);
 217
 218         for (i = 0; i < mp_irq_entries; i++) {
 219                 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
 220                         return;
 221         }
 222
 223         assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
 224         if (++mp_irq_entries == MAX_IRQ_SOURCES)
 225                 panic("Max # of irq sources exceeded!!\n");
 226 }
 227
 228 #endif
 229
 230 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
 231 {
 232         apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
 233                 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
 234                 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
 235                 m->srcbusirq, m->destapic, m->destapiclint);
 236 }
 237
 238 /*
 239  * Read/parse the MPC
 240  */
 241
 242 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
 243 {
 244
 245         if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
 246                 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
 247                        mpc->signature[0], mpc->signature[1],
 248                        mpc->signature[2], mpc->signature[3]);
 249                 return 0;
 250         }
 251         if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
 252                 printk(KERN_ERR "MPTABLE: checksum error!\n");
 253                 return 0;
 254         }
 255         if (mpc->spec != 0x01 && mpc->spec != 0x04) {
 256                 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
 257                        mpc->spec);
 258                 return 0;
 259         }
 260         if (!mpc->lapic) {
 261                 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
 262                 return 0;
 263         }
 264         memcpy(oem, mpc->oem, 8);
 265         oem[8] = 0;
 266         printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
 267
 268         memcpy(str, mpc->productid, 12);
 269         str[12] = 0;
 270
 271         printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
 272
 273         printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic);
 274
 275         return 1;
 276 }
 277
 278 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
 279 {
 280         char str[16];
 281         char oem[10];
 282
 283         int count = sizeof(*mpc);
 284         unsigned char *mpt = ((unsigned char *)mpc) + count;
 285
 286         if (!smp_check_mpc(mpc, oem, str))
 287                 return 0;
 288
 289 #ifdef CONFIG_X86_32
 290         generic_mps_oem_check(mpc, oem, str);
 291 #endif
 292         /* save the local APIC address, it might be non-default */
 293         if (!acpi_lapic)
 294                 mp_lapic_addr = mpc->lapic;
 295
 296         if (early)
 297                 return 1;
 298
 299         if (mpc->oemptr && x86_quirks->smp_read_mpc_oem) {
 300                 struct mpc_oemtable *oem_table = (void *)(long)mpc->oemptr;
 301                 x86_quirks->smp_read_mpc_oem(oem_table, mpc->oemsize);
 302         }
 303
 304         /*
 305          *      Now process the configuration blocks.
 306          */
 307         if (x86_quirks->mpc_record)
 308                 *x86_quirks->mpc_record = 0;
 309
 310         while (count < mpc->length) {
 311                 switch (*mpt) {
 312                 case MP_PROCESSOR:
 313                         {
 314                                 struct mpc_cpu *m = (struct mpc_cpu *)mpt;
 315                                 /* ACPI may have already provided this data */
 316                                 if (!acpi_lapic)
 317                                         MP_processor_info(m);
 318                                 mpt += sizeof(*m);
 319                                 count += sizeof(*m);
 320                                 break;
 321                         }
 322                 case MP_BUS:
 323                         {
 324                                 struct mpc_bus *m = (struct mpc_bus *)mpt;
 325 #ifdef CONFIG_X86_IO_APIC
 326                                 MP_bus_info(m);
 327 #endif
 328                                 mpt += sizeof(*m);
 329                                 count += sizeof(*m);
 330                                 break;
 331                         }
 332                 case MP_IOAPIC:
 333                         {
 334 #ifdef CONFIG_X86_IO_APIC
 335                                 struct mpc_ioapic *m = (struct mpc_ioapic *)mpt;
 336                                 MP_ioapic_info(m);
 337 #endif
 338                                 mpt += sizeof(struct mpc_ioapic);
 339                                 count += sizeof(struct mpc_ioapic);
 340                                 break;
 341                         }
 342                 case MP_INTSRC:
 343                         {
 344 #ifdef CONFIG_X86_IO_APIC
 345                                 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
 346
 347                                 MP_intsrc_info(m);
 348 #endif
 349                                 mpt += sizeof(struct mpc_intsrc);
 350                                 count += sizeof(struct mpc_intsrc);
 351                                 break;
 352                         }
 353                 case MP_LINTSRC:
 354                         {
 355                                 struct mpc_lintsrc *m =
 356                                     (struct mpc_lintsrc *)mpt;
 357                                 MP_lintsrc_info(m);
 358                                 mpt += sizeof(*m);
 359                                 count += sizeof(*m);
 360                                 break;
 361                         }
 362                 default:
 363                         /* wrong mptable */
 364                         printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
 365                         printk(KERN_ERR "type %x\n", *mpt);
 366                         print_hex_dump(KERN_ERR, "  ", DUMP_PREFIX_ADDRESS, 16,
 367                                         1, mpc, mpc->length, 1);
 368                         count = mpc->length;
 369                         break;
 370                 }
 371                 if (x86_quirks->mpc_record)
 372                         (*x86_quirks->mpc_record)++;
 373         }
 374
 375 #ifdef CONFIG_X86_BIGSMP
 376         generic_bigsmp_probe();
 377 #endif
 378
 379         if (apic->setup_apic_routing)
 380                 apic->setup_apic_routing();
 381
 382         if (!num_processors)
 383                 printk(KERN_ERR "MPTABLE: no processors registered!\n");
 384         return num_processors;
 385 }
 386
 387 #ifdef CONFIG_X86_IO_APIC
 388
 389 static int __init ELCR_trigger(unsigned int irq)
 390 {
 391         unsigned int port;
 392
 393         port = 0x4d0 + (irq >> 3);
 394         return (inb(port) >> (irq & 7)) & 1;
 395 }
 396
 397 static void __init construct_default_ioirq_mptable(int mpc_default_type)
 398 {
 399         struct mpc_intsrc intsrc;
 400         int i;
 401         int ELCR_fallback = 0;
 402
 403         intsrc.type = MP_INTSRC;
 404         intsrc.irqflag = 0;     /* conforming */
 405         intsrc.srcbus = 0;
 406         intsrc.dstapic = mp_ioapics[0].apicid;
 407
 408         intsrc.irqtype = mp_INT;
 409
 410         /*
 411          *  If true, we have an ISA/PCI system with no IRQ entries
 412          *  in the MP table. To prevent the PCI interrupts from being set up
 413          *  incorrectly, we try to use the ELCR. The sanity check to see if
 414          *  there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
 415          *  never be level sensitive, so we simply see if the ELCR agrees.
 416          *  If it does, we assume it's valid.
 417          */
 418         if (mpc_default_type == 5) {
 419                 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
 420                        "falling back to ELCR\n");
 421
 422                 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
 423                     ELCR_trigger(13))
 424                         printk(KERN_ERR "ELCR contains invalid data... "
 425                                "not using ELCR\n");
 426                 else {
 427                         printk(KERN_INFO
 428                                "Using ELCR to identify PCI interrupts\n");
 429                         ELCR_fallback = 1;
 430                 }
 431         }
 432
 433         for (i = 0; i < 16; i++) {
 434                 switch (mpc_default_type) {
 435                 case 2:
 436                         if (i == 0 || i == 13)
 437                                 continue;       /* IRQ0 & IRQ13 not connected */
 438                         /* fall through */
 439                 default:
 440                         if (i == 2)
 441                                 continue;       /* IRQ2 is never connected */
 442                 }
 443
 444                 if (ELCR_fallback) {
 445                         /*
 446                          *  If the ELCR indicates a level-sensitive interrupt, we
 447                          *  copy that information over to the MP table in the
 448                          *  irqflag field (level sensitive, active high polarity).
 449                          */
 450                         if (ELCR_trigger(i))
 451                                 intsrc.irqflag = 13;
 452                         else
 453                                 intsrc.irqflag = 0;
 454                 }
 455
 456                 intsrc.srcbusirq = i;
 457                 intsrc.dstirq = i ? i : 2;      /* IRQ0 to INTIN2 */
 458                 MP_intsrc_info(&intsrc);
 459         }
 460
 461         intsrc.irqtype = mp_ExtINT;
 462         intsrc.srcbusirq = 0;
 463         intsrc.dstirq = 0;      /* 8259A to INTIN0 */
 464         MP_intsrc_info(&intsrc);
 465 }
 466
 467
 468 static void __init construct_ioapic_table(int mpc_default_type)
 469 {
 470         struct mpc_ioapic ioapic;
 471         struct mpc_bus bus;
 472
 473         bus.type = MP_BUS;
 474         bus.busid = 0;
 475         switch (mpc_default_type) {
 476         default:
 477                 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
 478                        mpc_default_type);
 479                 /* fall through */
 480         case 1:
 481         case 5:
 482                 memcpy(bus.bustype, "ISA   ", 6);
 483                 break;
 484         case 2:
 485         case 6:
 486         case 3:
 487                 memcpy(bus.bustype, "EISA  ", 6);
 488                 break;
 489         case 4:
 490         case 7:
 491                 memcpy(bus.bustype, "MCA   ", 6);
 492         }
 493         MP_bus_info(&bus);
 494         if (mpc_default_type > 4) {
 495                 bus.busid = 1;
 496                 memcpy(bus.bustype, "PCI   ", 6);
 497                 MP_bus_info(&bus);
 498         }
 499
 500         ioapic.type = MP_IOAPIC;
 501         ioapic.apicid = 2;
 502         ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 503         ioapic.flags = MPC_APIC_USABLE;
 504         ioapic.apicaddr = 0xFEC00000;
 505         MP_ioapic_info(&ioapic);
 506
 507         /*
 508          * We set up most of the low 16 IO-APIC pins according to MPS rules.
 509          */
 510         construct_default_ioirq_mptable(mpc_default_type);
 511 }
 512 #else
 513 static inline void __init construct_ioapic_table(int mpc_default_type) { }
 514 #endif
 515
 516 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
 517 {
 518         struct mpc_cpu processor;
 519         struct mpc_lintsrc lintsrc;
 520         int linttypes[2] = { mp_ExtINT, mp_NMI };
 521         int i;
 522
 523         /*
 524          * local APIC has default address
 525          */
 526         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 527
 528         /*
 529          * 2 CPUs, numbered 0 & 1.
 530          */
 531         processor.type = MP_PROCESSOR;
 532         /* Either an integrated APIC or a discrete 82489DX. */
 533         processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 534         processor.cpuflag = CPU_ENABLED;
 535         processor.cpufeature = (boot_cpu_data.x86 << 8) |
 536             (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
 537         processor.featureflag = boot_cpu_data.x86_capability[0];
 538         processor.reserved[0] = 0;
 539         processor.reserved[1] = 0;
 540         for (i = 0; i < 2; i++) {
 541                 processor.apicid = i;
 542                 MP_processor_info(&processor);
 543         }
 544
 545         construct_ioapic_table(mpc_default_type);
 546
 547         lintsrc.type = MP_LINTSRC;
 548         lintsrc.irqflag = 0;            /* conforming */
 549         lintsrc.srcbusid = 0;
 550         lintsrc.srcbusirq = 0;
 551         lintsrc.destapic = MP_APIC_ALL;
 552         for (i = 0; i < 2; i++) {
 553                 lintsrc.irqtype = linttypes[i];
 554                 lintsrc.destapiclint = i;
 555                 MP_lintsrc_info(&lintsrc);
 556         }
 557 }
 558
 559 static struct mpf_intel *mpf_found;
 560
 561 static unsigned long __init get_mpc_size(unsigned long physptr)
 562 {
 563         struct mpc_table *mpc;
 564         unsigned long size;
 565
 566         mpc = early_ioremap(physptr, PAGE_SIZE);
 567         size = mpc->length;
 568         early_iounmap(mpc, PAGE_SIZE);
 569         apic_printk(APIC_VERBOSE, "  mpc: %lx-%lx\n", physptr, physptr + size);
 570
 571         return size;
 572 }
 573
 574 /*
 575  * Scan the memory blocks for an SMP configuration block.
 576  */
 577 static void __init __get_smp_config(unsigned int early)
 578 {
 579         struct mpf_intel *mpf = mpf_found;
 580
 581         if (!mpf)
 582                 return;
 583
 584         if (acpi_lapic && early)
 585                 return;
 586
 587         /*
 588          * MPS doesn't support hyperthreading, aka only have
 589          * thread 0 apic id in MPS table
 590          */
 591         if (acpi_lapic && acpi_ioapic)
 592                 return;
 593
 594         if (x86_quirks->mach_get_smp_config) {
 595                 if (x86_quirks->mach_get_smp_config(early))
 596                         return;
 597         }
 598
 599         printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
 600                mpf->specification);
 601 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
 602         if (mpf->feature2 & (1 << 7)) {
 603                 printk(KERN_INFO "    IMCR and PIC compatibility mode.\n");
 604                 pic_mode = 1;
 605         } else {
 606                 printk(KERN_INFO "    Virtual Wire compatibility mode.\n");
 607                 pic_mode = 0;
 608         }
 609 #endif
 610         /*
 611          * Now see if we need to read further.
 612          */
 613         if (mpf->feature1 != 0) {
 614                 if (early) {
 615                         /*
 616                          * local APIC has default address
 617                          */
 618                         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 619                         return;
 620                 }
 621
 622                 printk(KERN_INFO "Default MP configuration #%d\n",
 623                        mpf->feature1);
 624                 construct_default_ISA_mptable(mpf->feature1);
 625
 626         } else if (mpf->physptr) {
 627                 struct mpc_table *mpc;
 628                 unsigned long size;
 629
 630                 size = get_mpc_size(mpf->physptr);
 631                 mpc = early_ioremap(mpf->physptr, size);
 632                 /*
 633                  * Read the physical hardware table.  Anything here will
 634                  * override the defaults.
 635                  */
 636                 if (!smp_read_mpc(mpc, early)) {
 637 #ifdef CONFIG_X86_LOCAL_APIC
 638                         smp_found_config = 0;
 639 #endif
 640                         printk(KERN_ERR
 641                                "BIOS bug, MP table errors detected!...\n");
 642                         printk(KERN_ERR "... disabling SMP support. "
 643                                "(tell your hw vendor)\n");
 644                         early_iounmap(mpc, size);
 645                         return;
 646                 }
 647                 early_iounmap(mpc, size);
 648
 649                 if (early)
 650                         return;
 651 #ifdef CONFIG_X86_IO_APIC
 652                 /*
 653                  * If there are no explicit MP IRQ entries, then we are
 654                  * broken.  We set up most of the low 16 IO-APIC pins to
 655                  * ISA defaults and hope it will work.
 656                  */
 657                 if (!mp_irq_entries) {
 658                         struct mpc_bus bus;
 659
 660                         printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
 661                                "using default mptable. "
 662                                "(tell your hw vendor)\n");
 663
 664                         bus.type = MP_BUS;
 665                         bus.busid = 0;
 666                         memcpy(bus.bustype, "ISA   ", 6);
 667                         MP_bus_info(&bus);
 668
 669                         construct_default_ioirq_mptable(0);
 670                 }
 671 #endif
 672         } else
 673                 BUG();
 674
 675         if (!early)
 676                 printk(KERN_INFO "Processors: %d\n", num_processors);
 677         /*
 678          * Only use the first configuration found.
 679          */
 680 }
 681
 682 void __init early_get_smp_config(void)
 683 {
 684         __get_smp_config(1);
 685 }
 686
 687 void __init get_smp_config(void)
 688 {
 689         __get_smp_config(0);
 690 }
 691
 692 static int __init smp_scan_config(unsigned long base, unsigned long length,
 693                                   unsigned reserve)
 694 {
 695         unsigned int *bp = phys_to_virt(base);
 696         struct mpf_intel *mpf;
 697
 698         apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
 699                         bp, length);
 700         BUILD_BUG_ON(sizeof(*mpf) != 16);
 701
 702         while (length > 0) {
 703                 mpf = (struct mpf_intel *)bp;
 704                 if ((*bp == SMP_MAGIC_IDENT) &&
 705                     (mpf->length == 1) &&
 706                     !mpf_checksum((unsigned char *)bp, 16) &&
 707                     ((mpf->specification == 1)
 708                      || (mpf->specification == 4))) {
 709 #ifdef CONFIG_X86_LOCAL_APIC
 710                         smp_found_config = 1;
 711 #endif
 712                         mpf_found = mpf;
 713
 714                         printk(KERN_INFO "found SMP MP-table at [%p] %llx\n",
 715                                mpf, (u64)virt_to_phys(mpf));
 716
 717                         if (!reserve)
 718                                 return 1;
 719                         reserve_bootmem_generic(virt_to_phys(mpf), sizeof(*mpf),
 720                                         BOOTMEM_DEFAULT);
 721                         if (mpf->physptr) {
 722                                 unsigned long size = get_mpc_size(mpf->physptr);
 723 #ifdef CONFIG_X86_32
 724                                 /*
 725                                  * We cannot access to MPC table to compute
 726                                  * table size yet, as only few megabytes from
 727                                  * the bottom is mapped now.
 728                                  * PC-9800's MPC table places on the very last
 729                                  * of physical memory; so that simply reserving
 730                                  * PAGE_SIZE from mpf->physptr yields BUG()
 731                                  * in reserve_bootmem.
 732                                  * also need to make sure physptr is below than
 733                                  * max_low_pfn
 734                                  * we don't need reserve the area above max_low_pfn
 735                                  */
 736                                 unsigned long end = max_low_pfn * PAGE_SIZE;
 737
 738                                 if (mpf->physptr < end) {
 739                                         if (mpf->physptr + size > end)
 740                                                 size = end - mpf->physptr;
 741                                         reserve_bootmem_generic(mpf->physptr, size,
 742                                                         BOOTMEM_DEFAULT);
 743                                 }
 744 #else
 745                                 reserve_bootmem_generic(mpf->physptr, size,
 746                                                 BOOTMEM_DEFAULT);
 747 #endif
 748                         }
 749
 750                         return 1;
 751                 }
 752                 bp += 4;
 753                 length -= 16;
 754         }
 755         return 0;
 756 }
 757
 758 static void __init __find_smp_config(unsigned int reserve)
 759 {
 760         unsigned int address;
 761
 762         if (x86_quirks->mach_find_smp_config) {
 763                 if (x86_quirks->mach_find_smp_config(reserve))
 764                         return;
 765         }
 766         /*
 767          * FIXME: Linux assumes you have 640K of base ram..
 768          * this continues the error...
 769          *
 770          * 1) Scan the bottom 1K for a signature
 771          * 2) Scan the top 1K of base RAM
 772          * 3) Scan the 64K of bios
 773          */
 774         if (smp_scan_config(0x0, 0x400, reserve) ||
 775             smp_scan_config(639 * 0x400, 0x400, reserve) ||
 776             smp_scan_config(0xF0000, 0x10000, reserve))
 777                 return;
 778         /*
 779          * If it is an SMP machine we should know now, unless the
 780          * configuration is in an EISA/MCA bus machine with an
 781          * extended bios data area.
 782          *
 783          * there is a real-mode segmented pointer pointing to the
 784          * 4K EBDA area at 0x40E, calculate and scan it here.
 785          *
 786          * NOTE! There are Linux loaders that will corrupt the EBDA
 787          * area, and as such this kind of SMP config may be less
 788          * trustworthy, simply because the SMP table may have been
 789          * stomped on during early boot. These loaders are buggy and
 790          * should be fixed.
 791          *
 792          * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
 793          */
 794
 795         address = get_bios_ebda();
 796         if (address)
 797                 smp_scan_config(address, 0x400, reserve);
 798 }
 799
 800 void __init early_find_smp_config(void)
 801 {
 802         __find_smp_config(0);
 803 }
 804
 805 void __init find_smp_config(void)
 806 {
 807         __find_smp_config(1);
 808 }
 809
 810 #ifdef CONFIG_X86_IO_APIC
 811 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
 812
 813 static int  __init get_MP_intsrc_index(struct mpc_intsrc *m)
 814 {
 815         int i;
 816
 817         if (m->irqtype != mp_INT)
 818                 return 0;
 819
 820         if (m->irqflag != 0x0f)
 821                 return 0;
 822
 823         /* not legacy */
 824
 825         for (i = 0; i < mp_irq_entries; i++) {
 826                 if (mp_irqs[i].irqtype != mp_INT)
 827                         continue;
 828
 829                 if (mp_irqs[i].irqflag != 0x0f)
 830                         continue;
 831
 832                 if (mp_irqs[i].srcbus != m->srcbus)
 833                         continue;
 834                 if (mp_irqs[i].srcbusirq != m->srcbusirq)
 835                         continue;
 836                 if (irq_used[i]) {
 837                         /* already claimed */
 838                         return -2;
 839                 }
 840                 irq_used[i] = 1;
 841                 return i;
 842         }
 843
 844         /* not found */
 845         return -1;
 846 }
 847
 848 #define SPARE_SLOT_NUM 20
 849
 850 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
 851 #endif
 852
 853 static int  __init replace_intsrc_all(struct mpc_table *mpc,
 854                                         unsigned long mpc_new_phys,
 855                                         unsigned long mpc_new_length)
 856 {
 857 #ifdef CONFIG_X86_IO_APIC
 858         int i;
 859         int nr_m_spare = 0;
 860 #endif
 861
 862         int count = sizeof(*mpc);
 863         unsigned char *mpt = ((unsigned char *)mpc) + count;
 864
 865         printk(KERN_INFO "mpc_length %x\n", mpc->length);
 866         while (count < mpc->length) {
 867                 switch (*mpt) {
 868                 case MP_PROCESSOR:
 869                         {
 870                                 struct mpc_cpu *m = (struct mpc_cpu *)mpt;
 871                                 mpt += sizeof(*m);
 872                                 count += sizeof(*m);
 873                                 break;
 874                         }
 875                 case MP_BUS:
 876                         {
 877                                 struct mpc_bus *m = (struct mpc_bus *)mpt;
 878                                 mpt += sizeof(*m);
 879                                 count += sizeof(*m);
 880                                 break;
 881                         }
 882                 case MP_IOAPIC:
 883                         {
 884                                 mpt += sizeof(struct mpc_ioapic);
 885                                 count += sizeof(struct mpc_ioapic);
 886                                 break;
 887                         }
 888                 case MP_INTSRC:
 889                         {
 890 #ifdef CONFIG_X86_IO_APIC
 891                                 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
 892
 893                                 apic_printk(APIC_VERBOSE, "OLD ");
 894                                 print_MP_intsrc_info(m);
 895                                 i = get_MP_intsrc_index(m);
 896                                 if (i > 0) {
 897                                         assign_to_mpc_intsrc(&mp_irqs[i], m);
 898                                         apic_printk(APIC_VERBOSE, "NEW ");
 899                                         print_mp_irq_info(&mp_irqs[i]);
 900                                 } else if (!i) {
 901                                         /* legacy, do nothing */
 902                                 } else if (nr_m_spare < SPARE_SLOT_NUM) {
 903                                         /*
 904                                          * not found (-1), or duplicated (-2)
 905                                          * are invalid entries,
 906                                          * we need to use the slot  later
 907                                          */
 908                                         m_spare[nr_m_spare] = m;
 909                                         nr_m_spare++;
 910                                 }
 911 #endif
 912                                 mpt += sizeof(struct mpc_intsrc);
 913                                 count += sizeof(struct mpc_intsrc);
 914                                 break;
 915                         }
 916                 case MP_LINTSRC:
 917                         {
 918                                 struct mpc_lintsrc *m =
 919                                     (struct mpc_lintsrc *)mpt;
 920                                 mpt += sizeof(*m);
 921                                 count += sizeof(*m);
 922                                 break;
 923                         }
 924                 default:
 925                         /* wrong mptable */
 926                         printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
 927                         printk(KERN_ERR "type %x\n", *mpt);
 928                         print_hex_dump(KERN_ERR, "  ", DUMP_PREFIX_ADDRESS, 16,
 929                                         1, mpc, mpc->length, 1);
 930                         goto out;
 931                 }
 932         }
 933
 934 #ifdef CONFIG_X86_IO_APIC
 935         for (i = 0; i < mp_irq_entries; i++) {
 936                 if (irq_used[i])
 937                         continue;
 938
 939                 if (mp_irqs[i].irqtype != mp_INT)
 940                         continue;
 941
 942                 if (mp_irqs[i].irqflag != 0x0f)
 943                         continue;
 944
 945                 if (nr_m_spare > 0) {
 946                         apic_printk(APIC_VERBOSE, "*NEW* found\n");
 947                         nr_m_spare--;
 948                         assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
 949                         m_spare[nr_m_spare] = NULL;
 950                 } else {
 951                         struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
 952                         count += sizeof(struct mpc_intsrc);
 953                         if (!mpc_new_phys) {
 954                                 printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
 955                         } else {
 956                                 if (count <= mpc_new_length)
 957                                         printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
 958                                 else {
 959                                         printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
 960                                         goto out;
 961                                 }
 962                         }
 963                         assign_to_mpc_intsrc(&mp_irqs[i], m);
 964                         mpc->length = count;
 965                         mpt += sizeof(struct mpc_intsrc);
 966                 }
 967                 print_mp_irq_info(&mp_irqs[i]);
 968         }
 969 #endif
 970 out:
 971         /* update checksum */
 972         mpc->checksum = 0;
 973         mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
 974
 975         return 0;
 976 }
 977
 978 static int __initdata enable_update_mptable;
 979
 980 static int __init update_mptable_setup(char *str)
 981 {
 982         enable_update_mptable = 1;
 983         return 0;
 984 }
 985 early_param("update_mptable", update_mptable_setup);
 986
 987 static unsigned long __initdata mpc_new_phys;
 988 static unsigned long mpc_new_length __initdata = 4096;
 989
 990 /* alloc_mptable or alloc_mptable=4k */
 991 static int __initdata alloc_mptable;
 992 static int __init parse_alloc_mptable_opt(char *p)
 993 {
 994         enable_update_mptable = 1;
 995         alloc_mptable = 1;
 996         if (!p)
 997                 return 0;
 998         mpc_new_length = memparse(p, &p);
 999         return 0;
1000 }
1001 early_param("alloc_mptable", parse_alloc_mptable_opt);
1002
1003 void __init early_reserve_e820_mpc_new(void)
1004 {
1005         if (enable_update_mptable && alloc_mptable) {
1006                 u64 startt = 0;
1007 #ifdef CONFIG_X86_TRAMPOLINE
1008                 startt = TRAMPOLINE_BASE;
1009 #endif
1010                 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
1011         }
1012 }
1013
1014 static int __init update_mp_table(void)
1015 {
1016         char str[16];
1017         char oem[10];
1018         struct mpf_intel *mpf;
1019         struct mpc_table *mpc, *mpc_new;
1020
1021         if (!enable_update_mptable)
1022                 return 0;
1023
1024         mpf = mpf_found;
1025         if (!mpf)
1026                 return 0;
1027
1028         /*
1029          * Now see if we need to go further.
1030          */
1031         if (mpf->feature1 != 0)
1032                 return 0;
1033
1034         if (!mpf->physptr)
1035                 return 0;
1036
1037         mpc = phys_to_virt(mpf->physptr);
1038
1039         if (!smp_check_mpc(mpc, oem, str))
1040                 return 0;
1041
1042         printk(KERN_INFO "mpf: %llx\n", (u64)virt_to_phys(mpf));
1043         printk(KERN_INFO "physptr: %x\n", mpf->physptr);
1044
1045         if (mpc_new_phys && mpc->length > mpc_new_length) {
1046                 mpc_new_phys = 0;
1047                 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
1048                          mpc_new_length);
1049         }
1050
1051         if (!mpc_new_phys) {
1052                 unsigned char old, new;
1053                 /* check if we can change the postion */
1054                 mpc->checksum = 0;
1055                 old = mpf_checksum((unsigned char *)mpc, mpc->length);
1056                 mpc->checksum = 0xff;
1057                 new = mpf_checksum((unsigned char *)mpc, mpc->length);
1058                 if (old == new) {
1059                         printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
1060                         return 0;
1061                 }
1062                 printk(KERN_INFO "use in-positon replacing\n");
1063         } else {
1064                 mpf->physptr = mpc_new_phys;
1065                 mpc_new = phys_to_virt(mpc_new_phys);
1066                 memcpy(mpc_new, mpc, mpc->length);
1067                 mpc = mpc_new;
1068                 /* check if we can modify that */
1069                 if (mpc_new_phys - mpf->physptr) {
1070                         struct mpf_intel *mpf_new;
1071                         /* steal 16 bytes from [0, 1k) */
1072                         printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
1073                         mpf_new = phys_to_virt(0x400 - 16);
1074                         memcpy(mpf_new, mpf, 16);
1075                         mpf = mpf_new;
1076                         mpf->physptr = mpc_new_phys;
1077                 }
1078                 mpf->checksum = 0;
1079                 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
1080                 printk(KERN_INFO "physptr new: %x\n", mpf->physptr);
1081         }
1082
1083         /*
1084          * only replace the one with mp_INT and
1085          *       MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1086          * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1087          * may need pci=routeirq for all coverage
1088          */
1089         replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1090
1091         return 0;
1092 }
1093
1094 late_initcall(update_mp_table);