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 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 <mach_apic.h>
  33 #ifdef CONFIG_X86_32
  34 #include <mach_apicdef.h>
  35 #include <mach_mpparse.h>
  36 #endif
  37
  38 /*
  39  * Checksum an MP configuration block.
  40  */
  41
  42 static int __init mpf_checksum(unsigned char *mp, int len)
  43 {
  44         int sum = 0;
  45
  46         while (len--)
  47                 sum += *mp++;
  48
  49         return sum & 0xFF;
  50 }
  51
  52 static void __init MP_processor_info(struct mpc_cpu *m)
  53 {
  54         int apicid;
  55         char *bootup_cpu = "";
  56
  57         if (!(m->cpuflag & CPU_ENABLED)) {
  58                 disabled_cpus++;
  59                 return;
  60         }
  61
  62         if (x86_quirks->mpc_apic_id)
  63                 apicid = x86_quirks->mpc_apic_id(m);
  64         else
  65                 apicid = m->apicid;
  66
  67         if (m->cpuflag & CPU_BOOTPROCESSOR) {
  68                 bootup_cpu = " (Bootup-CPU)";
  69                 boot_cpu_physical_apicid = m->apicid;
  70         }
  71
  72         printk(KERN_INFO "Processor #%d%s\n", m->apicid, bootup_cpu);
  73         generic_processor_info(apicid, m->apicver);
  74 }
  75
  76 #ifdef CONFIG_X86_IO_APIC
  77 static void __init MP_bus_info(struct mpc_bus *m)
  78 {
  79         char str[7];
  80         memcpy(str, m->bustype, 6);
  81         str[6] = 0;
  82
  83         if (x86_quirks->mpc_oem_bus_info)
  84                 x86_quirks->mpc_oem_bus_info(m, str);
  85         else
  86                 apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
  87
  88 #if MAX_MP_BUSSES < 256
  89         if (m->busid >= MAX_MP_BUSSES) {
  90                 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
  91                        " is too large, max. supported is %d\n",
  92                        m->busid, str, MAX_MP_BUSSES - 1);
  93                 return;
  94         }
  95 #endif
  96
  97         if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
  98                 set_bit(m->busid, mp_bus_not_pci);
  99 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
 100                 mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
 101 #endif
 102         } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
 103                 if (x86_quirks->mpc_oem_pci_bus)
 104                         x86_quirks->mpc_oem_pci_bus(m);
 105
 106                 clear_bit(m->busid, mp_bus_not_pci);
 107 #if defined(CONFIG_EISA) || defined(CONFIG_MCA)
 108                 mp_bus_id_to_type[m->busid] = MP_BUS_PCI;
 109         } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
 110                 mp_bus_id_to_type[m->busid] = MP_BUS_EISA;
 111         } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
 112                 mp_bus_id_to_type[m->busid] = MP_BUS_MCA;
 113 #endif
 114         } else
 115                 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
 116 }
 117 #endif
 118
 119 #ifdef CONFIG_X86_IO_APIC
 120
 121 static int bad_ioapic(unsigned long address)
 122 {
 123         if (nr_ioapics >= MAX_IO_APICS) {
 124                 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
 125                        "(found %d)\n", MAX_IO_APICS, nr_ioapics);
 126                 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
 127         }
 128         if (!address) {
 129                 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
 130                        " found in table, skipping!\n");
 131                 return 1;
 132         }
 133         return 0;
 134 }
 135
 136 static void __init MP_ioapic_info(struct mpc_ioapic *m)
 137 {
 138         if (!(m->flags & MPC_APIC_USABLE))
 139                 return;
 140
 141         printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
 142                m->apicid, m->apicver, m->apicaddr);
 143
 144         if (bad_ioapic(m->apicaddr))
 145                 return;
 146
 147         mp_ioapics[nr_ioapics].apicaddr = m->apicaddr;
 148         mp_ioapics[nr_ioapics].apicid = m->apicid;
 149         mp_ioapics[nr_ioapics].type = m->type;
 150         mp_ioapics[nr_ioapics].apicver = m->apicver;
 151         mp_ioapics[nr_ioapics].flags = m->flags;
 152         nr_ioapics++;
 153 }
 154
 155 static void print_MP_intsrc_info(struct mpc_intsrc *m)
 156 {
 157         apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
 158                 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
 159                 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
 160                 m->srcbusirq, m->dstapic, m->dstirq);
 161 }
 162
 163 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
 164 {
 165         apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
 166                 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
 167                 mp_irq->irqtype, mp_irq->irqflag & 3,
 168                 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
 169                 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
 170 }
 171
 172 static void __init assign_to_mp_irq(struct mpc_intsrc *m,
 173                                     struct mpc_intsrc *mp_irq)
 174 {
 175         mp_irq->dstapic = m->dstapic;
 176         mp_irq->type = m->type;
 177         mp_irq->irqtype = m->irqtype;
 178         mp_irq->irqflag = m->irqflag;
 179         mp_irq->srcbus = m->srcbus;
 180         mp_irq->srcbusirq = m->srcbusirq;
 181         mp_irq->dstirq = m->dstirq;
 182 }
 183
 184 static void __init assign_to_mpc_intsrc(struct mpc_intsrc *mp_irq,
 185                                         struct mpc_intsrc *m)
 186 {
 187         m->dstapic = mp_irq->dstapic;
 188         m->type = mp_irq->type;
 189         m->irqtype = mp_irq->irqtype;
 190         m->irqflag = mp_irq->irqflag;
 191         m->srcbus = mp_irq->srcbus;
 192         m->srcbusirq = mp_irq->srcbusirq;
 193         m->dstirq = mp_irq->dstirq;
 194 }
 195
 196 static int __init mp_irq_mpc_intsrc_cmp(struct mpc_intsrc *mp_irq,
 197                                         struct mpc_intsrc *m)
 198 {
 199         if (mp_irq->dstapic != m->dstapic)
 200                 return 1;
 201         if (mp_irq->type != m->type)
 202                 return 2;
 203         if (mp_irq->irqtype != m->irqtype)
 204                 return 3;
 205         if (mp_irq->irqflag != m->irqflag)
 206                 return 4;
 207         if (mp_irq->srcbus != m->srcbus)
 208                 return 5;
 209         if (mp_irq->srcbusirq != m->srcbusirq)
 210                 return 6;
 211         if (mp_irq->dstirq != m->dstirq)
 212                 return 7;
 213
 214         return 0;
 215 }
 216
 217 static void __init MP_intsrc_info(struct mpc_intsrc *m)
 218 {
 219         int i;
 220
 221         print_MP_intsrc_info(m);
 222
 223         for (i = 0; i < mp_irq_entries; i++) {
 224                 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
 225                         return;
 226         }
 227
 228         assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
 229         if (++mp_irq_entries == MAX_IRQ_SOURCES)
 230                 panic("Max # of irq sources exceeded!!\n");
 231 }
 232
 233 #endif
 234
 235 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
 236 {
 237         apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
 238                 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
 239                 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
 240                 m->srcbusirq, m->destapic, m->destapiclint);
 241 }
 242
 243 /*
 244  * Read/parse the MPC
 245  */
 246
 247 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
 248 {
 249
 250         if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
 251                 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
 252                        mpc->signature[0], mpc->signature[1],
 253                        mpc->signature[2], mpc->signature[3]);
 254                 return 0;
 255         }
 256         if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
 257                 printk(KERN_ERR "MPTABLE: checksum error!\n");
 258                 return 0;
 259         }
 260         if (mpc->spec != 0x01 && mpc->spec != 0x04) {
 261                 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
 262                        mpc->spec);
 263                 return 0;
 264         }
 265         if (!mpc->lapic) {
 266                 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
 267                 return 0;
 268         }
 269         memcpy(oem, mpc->oem, 8);
 270         oem[8] = 0;
 271         printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
 272
 273         memcpy(str, mpc->productid, 12);
 274         str[12] = 0;
 275
 276         printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
 277
 278         printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic);
 279
 280         return 1;
 281 }
 282
 283 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
 284 {
 285         char str[16];
 286         char oem[10];
 287
 288         int count = sizeof(*mpc);
 289         unsigned char *mpt = ((unsigned char *)mpc) + count;
 290
 291         if (!smp_check_mpc(mpc, oem, str))
 292                 return 0;
 293
 294 #ifdef CONFIG_X86_32
 295         generic_mps_oem_check(mpc, oem, str);
 296 #endif
 297         /* save the local APIC address, it might be non-default */
 298         if (!acpi_lapic)
 299                 mp_lapic_addr = mpc->lapic;
 300
 301         if (early)
 302                 return 1;
 303
 304         if (mpc->oemptr && x86_quirks->smp_read_mpc_oem) {
 305                 struct mpc_oemtable *oem_table = (void *)(long)mpc->oemptr;
 306                 x86_quirks->smp_read_mpc_oem(oem_table, mpc->oemsize);
 307         }
 308
 309         /*
 310          *      Now process the configuration blocks.
 311          */
 312         if (x86_quirks->mpc_record)
 313                 *x86_quirks->mpc_record = 0;
 314
 315         while (count < mpc->length) {
 316                 switch (*mpt) {
 317                 case MP_PROCESSOR:
 318                         {
 319                                 struct mpc_cpu *m = (struct mpc_cpu *)mpt;
 320                                 /* ACPI may have already provided this data */
 321                                 if (!acpi_lapic)
 322                                         MP_processor_info(m);
 323                                 mpt += sizeof(*m);
 324                                 count += sizeof(*m);
 325                                 break;
 326                         }
 327                 case MP_BUS:
 328                         {
 329                                 struct mpc_bus *m = (struct mpc_bus *)mpt;
 330 #ifdef CONFIG_X86_IO_APIC
 331                                 MP_bus_info(m);
 332 #endif
 333                                 mpt += sizeof(*m);
 334                                 count += sizeof(*m);
 335                                 break;
 336                         }
 337                 case MP_IOAPIC:
 338                         {
 339 #ifdef CONFIG_X86_IO_APIC
 340                                 struct mpc_ioapic *m = (struct mpc_ioapic *)mpt;
 341                                 MP_ioapic_info(m);
 342 #endif
 343                                 mpt += sizeof(struct mpc_ioapic);
 344                                 count += sizeof(struct mpc_ioapic);
 345                                 break;
 346                         }
 347                 case MP_INTSRC:
 348                         {
 349 #ifdef CONFIG_X86_IO_APIC
 350                                 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
 351
 352                                 MP_intsrc_info(m);
 353 #endif
 354                                 mpt += sizeof(struct mpc_intsrc);
 355                                 count += sizeof(struct mpc_intsrc);
 356                                 break;
 357                         }
 358                 case MP_LINTSRC:
 359                         {
 360                                 struct mpc_lintsrc *m =
 361                                     (struct mpc_lintsrc *)mpt;
 362                                 MP_lintsrc_info(m);
 363                                 mpt += sizeof(*m);
 364                                 count += sizeof(*m);
 365                                 break;
 366                         }
 367                 default:
 368                         /* wrong mptable */
 369                         printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
 370                         printk(KERN_ERR "type %x\n", *mpt);
 371                         print_hex_dump(KERN_ERR, "  ", DUMP_PREFIX_ADDRESS, 16,
 372                                         1, mpc, mpc->length, 1);
 373                         count = mpc->length;
 374                         break;
 375                 }
 376                 if (x86_quirks->mpc_record)
 377                         (*x86_quirks->mpc_record)++;
 378         }
 379
 380 #ifdef CONFIG_X86_GENERICARCH
 381        generic_bigsmp_probe();
 382 #endif
 383
 384         if (apic->setup_apic_routing)
 385                 apic->setup_apic_routing();
 386
 387         if (!num_processors)
 388                 printk(KERN_ERR "MPTABLE: no processors registered!\n");
 389         return num_processors;
 390 }
 391
 392 #ifdef CONFIG_X86_IO_APIC
 393
 394 static int __init ELCR_trigger(unsigned int irq)
 395 {
 396         unsigned int port;
 397
 398         port = 0x4d0 + (irq >> 3);
 399         return (inb(port) >> (irq & 7)) & 1;
 400 }
 401
 402 static void __init construct_default_ioirq_mptable(int mpc_default_type)
 403 {
 404         struct mpc_intsrc intsrc;
 405         int i;
 406         int ELCR_fallback = 0;
 407
 408         intsrc.type = MP_INTSRC;
 409         intsrc.irqflag = 0;     /* conforming */
 410         intsrc.srcbus = 0;
 411         intsrc.dstapic = mp_ioapics[0].apicid;
 412
 413         intsrc.irqtype = mp_INT;
 414
 415         /*
 416          *  If true, we have an ISA/PCI system with no IRQ entries
 417          *  in the MP table. To prevent the PCI interrupts from being set up
 418          *  incorrectly, we try to use the ELCR. The sanity check to see if
 419          *  there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
 420          *  never be level sensitive, so we simply see if the ELCR agrees.
 421          *  If it does, we assume it's valid.
 422          */
 423         if (mpc_default_type == 5) {
 424                 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
 425                        "falling back to ELCR\n");
 426
 427                 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
 428                     ELCR_trigger(13))
 429                         printk(KERN_ERR "ELCR contains invalid data... "
 430                                "not using ELCR\n");
 431                 else {
 432                         printk(KERN_INFO
 433                                "Using ELCR to identify PCI interrupts\n");
 434                         ELCR_fallback = 1;
 435                 }
 436         }
 437
 438         for (i = 0; i < 16; i++) {
 439                 switch (mpc_default_type) {
 440                 case 2:
 441                         if (i == 0 || i == 13)
 442                                 continue;       /* IRQ0 & IRQ13 not connected */
 443                         /* fall through */
 444                 default:
 445                         if (i == 2)
 446                                 continue;       /* IRQ2 is never connected */
 447                 }
 448
 449                 if (ELCR_fallback) {
 450                         /*
 451                          *  If the ELCR indicates a level-sensitive interrupt, we
 452                          *  copy that information over to the MP table in the
 453                          *  irqflag field (level sensitive, active high polarity).
 454                          */
 455                         if (ELCR_trigger(i))
 456                                 intsrc.irqflag = 13;
 457                         else
 458                                 intsrc.irqflag = 0;
 459                 }
 460
 461                 intsrc.srcbusirq = i;
 462                 intsrc.dstirq = i ? i : 2;      /* IRQ0 to INTIN2 */
 463                 MP_intsrc_info(&intsrc);
 464         }
 465
 466         intsrc.irqtype = mp_ExtINT;
 467         intsrc.srcbusirq = 0;
 468         intsrc.dstirq = 0;      /* 8259A to INTIN0 */
 469         MP_intsrc_info(&intsrc);
 470 }
 471
 472
 473 static void __init construct_ioapic_table(int mpc_default_type)
 474 {
 475         struct mpc_ioapic ioapic;
 476         struct mpc_bus bus;
 477
 478         bus.type = MP_BUS;
 479         bus.busid = 0;
 480         switch (mpc_default_type) {
 481         default:
 482                 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
 483                        mpc_default_type);
 484                 /* fall through */
 485         case 1:
 486         case 5:
 487                 memcpy(bus.bustype, "ISA   ", 6);
 488                 break;
 489         case 2:
 490         case 6:
 491         case 3:
 492                 memcpy(bus.bustype, "EISA  ", 6);
 493                 break;
 494         case 4:
 495         case 7:
 496                 memcpy(bus.bustype, "MCA   ", 6);
 497         }
 498         MP_bus_info(&bus);
 499         if (mpc_default_type > 4) {
 500                 bus.busid = 1;
 501                 memcpy(bus.bustype, "PCI   ", 6);
 502                 MP_bus_info(&bus);
 503         }
 504
 505         ioapic.type = MP_IOAPIC;
 506         ioapic.apicid = 2;
 507         ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 508         ioapic.flags = MPC_APIC_USABLE;
 509         ioapic.apicaddr = 0xFEC00000;
 510         MP_ioapic_info(&ioapic);
 511
 512         /*
 513          * We set up most of the low 16 IO-APIC pins according to MPS rules.
 514          */
 515         construct_default_ioirq_mptable(mpc_default_type);
 516 }
 517 #else
 518 static inline void __init construct_ioapic_table(int mpc_default_type) { }
 519 #endif
 520
 521 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
 522 {
 523         struct mpc_cpu processor;
 524         struct mpc_lintsrc lintsrc;
 525         int linttypes[2] = { mp_ExtINT, mp_NMI };
 526         int i;
 527
 528         /*
 529          * local APIC has default address
 530          */
 531         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 532
 533         /*
 534          * 2 CPUs, numbered 0 & 1.
 535          */
 536         processor.type = MP_PROCESSOR;
 537         /* Either an integrated APIC or a discrete 82489DX. */
 538         processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 539         processor.cpuflag = CPU_ENABLED;
 540         processor.cpufeature = (boot_cpu_data.x86 << 8) |
 541             (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
 542         processor.featureflag = boot_cpu_data.x86_capability[0];
 543         processor.reserved[0] = 0;
 544         processor.reserved[1] = 0;
 545         for (i = 0; i < 2; i++) {
 546                 processor.apicid = i;
 547                 MP_processor_info(&processor);
 548         }
 549
 550         construct_ioapic_table(mpc_default_type);
 551
 552         lintsrc.type = MP_LINTSRC;
 553         lintsrc.irqflag = 0;            /* conforming */
 554         lintsrc.srcbusid = 0;
 555         lintsrc.srcbusirq = 0;
 556         lintsrc.destapic = MP_APIC_ALL;
 557         for (i = 0; i < 2; i++) {
 558                 lintsrc.irqtype = linttypes[i];
 559                 lintsrc.destapiclint = i;
 560                 MP_lintsrc_info(&lintsrc);
 561         }
 562 }
 563
 564 static struct mpf_intel *mpf_found;
 565
 566 /*
 567  * Scan the memory blocks for an SMP configuration block.
 568  */
 569 static void __init __get_smp_config(unsigned int early)
 570 {
 571         struct mpf_intel *mpf = mpf_found;
 572
 573         if (!mpf)
 574                 return;
 575
 576         if (acpi_lapic && early)
 577                 return;
 578
 579         /*
 580          * MPS doesn't support hyperthreading, aka only have
 581          * thread 0 apic id in MPS table
 582          */
 583         if (acpi_lapic && acpi_ioapic)
 584                 return;
 585
 586         if (x86_quirks->mach_get_smp_config) {
 587                 if (x86_quirks->mach_get_smp_config(early))
 588                         return;
 589         }
 590
 591         printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
 592                mpf->specification);
 593 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
 594         if (mpf->feature2 & (1 << 7)) {
 595                 printk(KERN_INFO "    IMCR and PIC compatibility mode.\n");
 596                 pic_mode = 1;
 597         } else {
 598                 printk(KERN_INFO "    Virtual Wire compatibility mode.\n");
 599                 pic_mode = 0;
 600         }
 601 #endif
 602         /*
 603          * Now see if we need to read further.
 604          */
 605         if (mpf->feature1 != 0) {
 606                 if (early) {
 607                         /*
 608                          * local APIC has default address
 609                          */
 610                         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 611                         return;
 612                 }
 613
 614                 printk(KERN_INFO "Default MP configuration #%d\n",
 615                        mpf->feature1);
 616                 construct_default_ISA_mptable(mpf->feature1);
 617
 618         } else if (mpf->physptr) {
 619
 620                 /*
 621                  * Read the physical hardware table.  Anything here will
 622                  * override the defaults.
 623                  */
 624                 if (!smp_read_mpc(phys_to_virt(mpf->physptr), early)) {
 625 #ifdef CONFIG_X86_LOCAL_APIC
 626                         smp_found_config = 0;
 627 #endif
 628                         printk(KERN_ERR
 629                                "BIOS bug, MP table errors detected!...\n");
 630                         printk(KERN_ERR "... disabling SMP support. "
 631                                "(tell your hw vendor)\n");
 632                         return;
 633                 }
 634
 635                 if (early)
 636                         return;
 637 #ifdef CONFIG_X86_IO_APIC
 638                 /*
 639                  * If there are no explicit MP IRQ entries, then we are
 640                  * broken.  We set up most of the low 16 IO-APIC pins to
 641                  * ISA defaults and hope it will work.
 642                  */
 643                 if (!mp_irq_entries) {
 644                         struct mpc_bus bus;
 645
 646                         printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
 647                                "using default mptable. "
 648                                "(tell your hw vendor)\n");
 649
 650                         bus.type = MP_BUS;
 651                         bus.busid = 0;
 652                         memcpy(bus.bustype, "ISA   ", 6);
 653                         MP_bus_info(&bus);
 654
 655                         construct_default_ioirq_mptable(0);
 656                 }
 657 #endif
 658         } else
 659                 BUG();
 660
 661         if (!early)
 662                 printk(KERN_INFO "Processors: %d\n", num_processors);
 663         /*
 664          * Only use the first configuration found.
 665          */
 666 }
 667
 668 void __init early_get_smp_config(void)
 669 {
 670         __get_smp_config(1);
 671 }
 672
 673 void __init get_smp_config(void)
 674 {
 675         __get_smp_config(0);
 676 }
 677
 678 static int __init smp_scan_config(unsigned long base, unsigned long length,
 679                                   unsigned reserve)
 680 {
 681         unsigned int *bp = phys_to_virt(base);
 682         struct mpf_intel *mpf;
 683
 684         apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
 685                         bp, length);
 686         BUILD_BUG_ON(sizeof(*mpf) != 16);
 687
 688         while (length > 0) {
 689                 mpf = (struct mpf_intel *)bp;
 690                 if ((*bp == SMP_MAGIC_IDENT) &&
 691                     (mpf->length == 1) &&
 692                     !mpf_checksum((unsigned char *)bp, 16) &&
 693                     ((mpf->specification == 1)
 694                      || (mpf->specification == 4))) {
 695 #ifdef CONFIG_X86_LOCAL_APIC
 696                         smp_found_config = 1;
 697 #endif
 698                         mpf_found = mpf;
 699
 700                         printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
 701                                mpf, virt_to_phys(mpf));
 702
 703                         if (!reserve)
 704                                 return 1;
 705                         reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE,
 706                                         BOOTMEM_DEFAULT);
 707                         if (mpf->physptr) {
 708                                 unsigned long size = PAGE_SIZE;
 709 #ifdef CONFIG_X86_32
 710                                 /*
 711                                  * We cannot access to MPC table to compute
 712                                  * table size yet, as only few megabytes from
 713                                  * the bottom is mapped now.
 714                                  * PC-9800's MPC table places on the very last
 715                                  * of physical memory; so that simply reserving
 716                                  * PAGE_SIZE from mpf->physptr yields BUG()
 717                                  * in reserve_bootmem.
 718                                  */
 719                                 unsigned long end = max_low_pfn * PAGE_SIZE;
 720                                 if (mpf->physptr + size > end)
 721                                         size = end - mpf->physptr;
 722 #endif
 723                                 reserve_bootmem_generic(mpf->physptr, size,
 724                                                 BOOTMEM_DEFAULT);
 725                         }
 726
 727                         return 1;
 728                 }
 729                 bp += 4;
 730                 length -= 16;
 731         }
 732         return 0;
 733 }
 734
 735 static void __init __find_smp_config(unsigned int reserve)
 736 {
 737         unsigned int address;
 738
 739         if (x86_quirks->mach_find_smp_config) {
 740                 if (x86_quirks->mach_find_smp_config(reserve))
 741                         return;
 742         }
 743         /*
 744          * FIXME: Linux assumes you have 640K of base ram..
 745          * this continues the error...
 746          *
 747          * 1) Scan the bottom 1K for a signature
 748          * 2) Scan the top 1K of base RAM
 749          * 3) Scan the 64K of bios
 750          */
 751         if (smp_scan_config(0x0, 0x400, reserve) ||
 752             smp_scan_config(639 * 0x400, 0x400, reserve) ||
 753             smp_scan_config(0xF0000, 0x10000, reserve))
 754                 return;
 755         /*
 756          * If it is an SMP machine we should know now, unless the
 757          * configuration is in an EISA/MCA bus machine with an
 758          * extended bios data area.
 759          *
 760          * there is a real-mode segmented pointer pointing to the
 761          * 4K EBDA area at 0x40E, calculate and scan it here.
 762          *
 763          * NOTE! There are Linux loaders that will corrupt the EBDA
 764          * area, and as such this kind of SMP config may be less
 765          * trustworthy, simply because the SMP table may have been
 766          * stomped on during early boot. These loaders are buggy and
 767          * should be fixed.
 768          *
 769          * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
 770          */
 771
 772         address = get_bios_ebda();
 773         if (address)
 774                 smp_scan_config(address, 0x400, reserve);
 775 }
 776
 777 void __init early_find_smp_config(void)
 778 {
 779         __find_smp_config(0);
 780 }
 781
 782 void __init find_smp_config(void)
 783 {
 784         __find_smp_config(1);
 785 }
 786
 787 #ifdef CONFIG_X86_IO_APIC
 788 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
 789
 790 static int  __init get_MP_intsrc_index(struct mpc_intsrc *m)
 791 {
 792         int i;
 793
 794         if (m->irqtype != mp_INT)
 795                 return 0;
 796
 797         if (m->irqflag != 0x0f)
 798                 return 0;
 799
 800         /* not legacy */
 801
 802         for (i = 0; i < mp_irq_entries; i++) {
 803                 if (mp_irqs[i].irqtype != mp_INT)
 804                         continue;
 805
 806                 if (mp_irqs[i].irqflag != 0x0f)
 807                         continue;
 808
 809                 if (mp_irqs[i].srcbus != m->srcbus)
 810                         continue;
 811                 if (mp_irqs[i].srcbusirq != m->srcbusirq)
 812                         continue;
 813                 if (irq_used[i]) {
 814                         /* already claimed */
 815                         return -2;
 816                 }
 817                 irq_used[i] = 1;
 818                 return i;
 819         }
 820
 821         /* not found */
 822         return -1;
 823 }
 824
 825 #define SPARE_SLOT_NUM 20
 826
 827 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
 828 #endif
 829
 830 static int  __init replace_intsrc_all(struct mpc_table *mpc,
 831                                         unsigned long mpc_new_phys,
 832                                         unsigned long mpc_new_length)
 833 {
 834 #ifdef CONFIG_X86_IO_APIC
 835         int i;
 836         int nr_m_spare = 0;
 837 #endif
 838
 839         int count = sizeof(*mpc);
 840         unsigned char *mpt = ((unsigned char *)mpc) + count;
 841
 842         printk(KERN_INFO "mpc_length %x\n", mpc->length);
 843         while (count < mpc->length) {
 844                 switch (*mpt) {
 845                 case MP_PROCESSOR:
 846                         {
 847                                 struct mpc_cpu *m = (struct mpc_cpu *)mpt;
 848                                 mpt += sizeof(*m);
 849                                 count += sizeof(*m);
 850                                 break;
 851                         }
 852                 case MP_BUS:
 853                         {
 854                                 struct mpc_bus *m = (struct mpc_bus *)mpt;
 855                                 mpt += sizeof(*m);
 856                                 count += sizeof(*m);
 857                                 break;
 858                         }
 859                 case MP_IOAPIC:
 860                         {
 861                                 mpt += sizeof(struct mpc_ioapic);
 862                                 count += sizeof(struct mpc_ioapic);
 863                                 break;
 864                         }
 865                 case MP_INTSRC:
 866                         {
 867 #ifdef CONFIG_X86_IO_APIC
 868                                 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
 869
 870                                 printk(KERN_INFO "OLD ");
 871                                 print_MP_intsrc_info(m);
 872                                 i = get_MP_intsrc_index(m);
 873                                 if (i > 0) {
 874                                         assign_to_mpc_intsrc(&mp_irqs[i], m);
 875                                         printk(KERN_INFO "NEW ");
 876                                         print_mp_irq_info(&mp_irqs[i]);
 877                                 } else if (!i) {
 878                                         /* legacy, do nothing */
 879                                 } else if (nr_m_spare < SPARE_SLOT_NUM) {
 880                                         /*
 881                                          * not found (-1), or duplicated (-2)
 882                                          * are invalid entries,
 883                                          * we need to use the slot  later
 884                                          */
 885                                         m_spare[nr_m_spare] = m;
 886                                         nr_m_spare++;
 887                                 }
 888 #endif
 889                                 mpt += sizeof(struct mpc_intsrc);
 890                                 count += sizeof(struct mpc_intsrc);
 891                                 break;
 892                         }
 893                 case MP_LINTSRC:
 894                         {
 895                                 struct mpc_lintsrc *m =
 896                                     (struct mpc_lintsrc *)mpt;
 897                                 mpt += sizeof(*m);
 898                                 count += sizeof(*m);
 899                                 break;
 900                         }
 901                 default:
 902                         /* wrong mptable */
 903                         printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
 904                         printk(KERN_ERR "type %x\n", *mpt);
 905                         print_hex_dump(KERN_ERR, "  ", DUMP_PREFIX_ADDRESS, 16,
 906                                         1, mpc, mpc->length, 1);
 907                         goto out;
 908                 }
 909         }
 910
 911 #ifdef CONFIG_X86_IO_APIC
 912         for (i = 0; i < mp_irq_entries; i++) {
 913                 if (irq_used[i])
 914                         continue;
 915
 916                 if (mp_irqs[i].irqtype != mp_INT)
 917                         continue;
 918
 919                 if (mp_irqs[i].irqflag != 0x0f)
 920                         continue;
 921
 922                 if (nr_m_spare > 0) {
 923                         printk(KERN_INFO "*NEW* found ");
 924                         nr_m_spare--;
 925                         assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
 926                         m_spare[nr_m_spare] = NULL;
 927                 } else {
 928                         struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
 929                         count += sizeof(struct mpc_intsrc);
 930                         if (!mpc_new_phys) {
 931                                 printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
 932                         } else {
 933                                 if (count <= mpc_new_length)
 934                                         printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
 935                                 else {
 936                                         printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
 937                                         goto out;
 938                                 }
 939                         }
 940                         assign_to_mpc_intsrc(&mp_irqs[i], m);
 941                         mpc->length = count;
 942                         mpt += sizeof(struct mpc_intsrc);
 943                 }
 944                 print_mp_irq_info(&mp_irqs[i]);
 945         }
 946 #endif
 947 out:
 948         /* update checksum */
 949         mpc->checksum = 0;
 950         mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
 951
 952         return 0;
 953 }
 954
 955 static int __initdata enable_update_mptable;
 956
 957 static int __init update_mptable_setup(char *str)
 958 {
 959         enable_update_mptable = 1;
 960         return 0;
 961 }
 962 early_param("update_mptable", update_mptable_setup);
 963
 964 static unsigned long __initdata mpc_new_phys;
 965 static unsigned long mpc_new_length __initdata = 4096;
 966
 967 /* alloc_mptable or alloc_mptable=4k */
 968 static int __initdata alloc_mptable;
 969 static int __init parse_alloc_mptable_opt(char *p)
 970 {
 971         enable_update_mptable = 1;
 972         alloc_mptable = 1;
 973         if (!p)
 974                 return 0;
 975         mpc_new_length = memparse(p, &p);
 976         return 0;
 977 }
 978 early_param("alloc_mptable", parse_alloc_mptable_opt);
 979
 980 void __init early_reserve_e820_mpc_new(void)
 981 {
 982         if (enable_update_mptable && alloc_mptable) {
 983                 u64 startt = 0;
 984 #ifdef CONFIG_X86_TRAMPOLINE
 985                 startt = TRAMPOLINE_BASE;
 986 #endif
 987                 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
 988         }
 989 }
 990
 991 static int __init update_mp_table(void)
 992 {
 993         char str[16];
 994         char oem[10];
 995         struct mpf_intel *mpf;
 996         struct mpc_table *mpc, *mpc_new;
 997
 998         if (!enable_update_mptable)
 999                 return 0;
1000
1001         mpf = mpf_found;
1002         if (!mpf)
1003                 return 0;
1004
1005         /*
1006          * Now see if we need to go further.
1007          */
1008         if (mpf->feature1 != 0)
1009                 return 0;
1010
1011         if (!mpf->physptr)
1012                 return 0;
1013
1014         mpc = phys_to_virt(mpf->physptr);
1015
1016         if (!smp_check_mpc(mpc, oem, str))
1017                 return 0;
1018
1019         printk(KERN_INFO "mpf: %lx\n", virt_to_phys(mpf));
1020         printk(KERN_INFO "physptr: %x\n", mpf->physptr);
1021
1022         if (mpc_new_phys && mpc->length > mpc_new_length) {
1023                 mpc_new_phys = 0;
1024                 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
1025                          mpc_new_length);
1026         }
1027
1028         if (!mpc_new_phys) {
1029                 unsigned char old, new;
1030                 /* check if we can change the postion */
1031                 mpc->checksum = 0;
1032                 old = mpf_checksum((unsigned char *)mpc, mpc->length);
1033                 mpc->checksum = 0xff;
1034                 new = mpf_checksum((unsigned char *)mpc, mpc->length);
1035                 if (old == new) {
1036                         printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
1037                         return 0;
1038                 }
1039                 printk(KERN_INFO "use in-positon replacing\n");
1040         } else {
1041                 mpf->physptr = mpc_new_phys;
1042                 mpc_new = phys_to_virt(mpc_new_phys);
1043                 memcpy(mpc_new, mpc, mpc->length);
1044                 mpc = mpc_new;
1045                 /* check if we can modify that */
1046                 if (mpc_new_phys - mpf->physptr) {
1047                         struct mpf_intel *mpf_new;
1048                         /* steal 16 bytes from [0, 1k) */
1049                         printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
1050                         mpf_new = phys_to_virt(0x400 - 16);
1051                         memcpy(mpf_new, mpf, 16);
1052                         mpf = mpf_new;
1053                         mpf->physptr = mpc_new_phys;
1054                 }
1055                 mpf->checksum = 0;
1056                 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
1057                 printk(KERN_INFO "physptr new: %x\n", mpf->physptr);
1058         }
1059
1060         /*
1061          * only replace the one with mp_INT and
1062          *       MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1063          * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1064          * may need pci=routeirq for all coverage
1065          */
1066         replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1067
1068         return 0;
1069 }
1070
1071 late_initcall(update_mp_table);