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