arch/x86/kernel/mpparse.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      Intel Multiprocessor Specification 1.1 and 1.4
   4  *      compliant MP-table parsing routines.
   5  *
   6  *      (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk>
   7  *      (c) 1998, 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com>
   8  *      (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
   9  */
  10
  11 #include <linux/mm.h>
  12 #include <linux/init.h>
  13 #include <linux/delay.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/memblock.h>
  16 #include <linux/kernel_stat.h>
  17 #include <linux/mc146818rtc.h>
  18 #include <linux/bitops.h>
  19 #include <linux/acpi.h>
  20 #include <linux/smp.h>
  21 #include <linux/pci.h>
  22
  23 #include <asm/irqdomain.h>
  24 #include <asm/mtrr.h>
  25 #include <asm/mpspec.h>
  26 #include <asm/pgalloc.h>
  27 #include <asm/io_apic.h>
  28 #include <asm/proto.h>
  29 #include <asm/bios_ebda.h>
  30 #include <asm/e820/api.h>
  31 #include <asm/setup.h>
  32 #include <asm/smp.h>
  33
  34 #include <asm/apic.h>
  35 /*
  36  * Checksum an MP configuration block.
  37  */
  38
  39 static int __init mpf_checksum(unsigned char *mp, int len)
  40 {
  41         int sum = 0;
  42
  43         while (len--)
  44                 sum += *mp++;
  45
  46         return sum & 0xFF;
  47 }
  48
  49 int __init default_mpc_apic_id(struct mpc_cpu *m)
  50 {
  51         return m->apicid;
  52 }
  53
  54 static void __init MP_processor_info(struct mpc_cpu *m)
  55 {
  56         int apicid;
  57         char *bootup_cpu = "";
  58
  59         if (!(m->cpuflag & CPU_ENABLED)) {
  60                 disabled_cpus++;
  61                 return;
  62         }
  63
  64         apicid = x86_init.mpparse.mpc_apic_id(m);
  65
  66         if (m->cpuflag & CPU_BOOTPROCESSOR) {
  67                 bootup_cpu = " (Bootup-CPU)";
  68                 boot_cpu_physical_apicid = m->apicid;
  69         }
  70
  71         pr_info("Processor #%d%s\n", m->apicid, bootup_cpu);
  72         generic_processor_info(apicid, m->apicver);
  73 }
  74
  75 #ifdef CONFIG_X86_IO_APIC
  76 void __init default_mpc_oem_bus_info(struct mpc_bus *m, char *str)
  77 {
  78         memcpy(str, m->bustype, 6);
  79         str[6] = 0;
  80         apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
  81 }
  82
  83 static void __init MP_bus_info(struct mpc_bus *m)
  84 {
  85         char str[7];
  86
  87         x86_init.mpparse.mpc_oem_bus_info(m, str);
  88
  89 #if MAX_MP_BUSSES < 256
  90         if (m->busid >= MAX_MP_BUSSES) {
  91                 pr_warn("MP table busid value (%d) for bustype %s is too large, max. supported is %d\n",
  92                         m->busid, str, MAX_MP_BUSSES - 1);
  93                 return;
  94         }
  95 #endif
  96
  97         set_bit(m->busid, mp_bus_not_pci);
  98         if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
  99 #ifdef CONFIG_EISA
 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_init.mpparse.mpc_oem_pci_bus)
 104                         x86_init.mpparse.mpc_oem_pci_bus(m);
 105
 106                 clear_bit(m->busid, mp_bus_not_pci);
 107 #ifdef CONFIG_EISA
 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 #endif
 112         } else
 113                 pr_warn("Unknown bustype %s - ignoring\n", str);
 114 }
 115
 116 static void __init MP_ioapic_info(struct mpc_ioapic *m)
 117 {
 118         struct ioapic_domain_cfg cfg = {
 119                 .type = IOAPIC_DOMAIN_LEGACY,
 120                 .ops = &mp_ioapic_irqdomain_ops,
 121         };
 122
 123         if (m->flags & MPC_APIC_USABLE)
 124                 mp_register_ioapic(m->apicid, m->apicaddr, gsi_top, &cfg);
 125 }
 126
 127 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
 128 {
 129         apic_printk(APIC_VERBOSE,
 130                 "Int: type %d, pol %d, trig %d, bus %02x, IRQ %02x, APIC ID %x, APIC INT %02x\n",
 131                 mp_irq->irqtype, mp_irq->irqflag & 3,
 132                 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
 133                 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
 134 }
 135
 136 #else /* CONFIG_X86_IO_APIC */
 137 static inline void __init MP_bus_info(struct mpc_bus *m) {}
 138 static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
 139 #endif /* CONFIG_X86_IO_APIC */
 140
 141 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
 142 {
 143         apic_printk(APIC_VERBOSE,
 144                 "Lint: type %d, pol %d, trig %d, bus %02x, IRQ %02x, APIC ID %x, APIC LINT %02x\n",
 145                 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
 146                 m->srcbusirq, m->destapic, m->destapiclint);
 147 }
 148
 149 /*
 150  * Read/parse the MPC
 151  */
 152 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
 153 {
 154
 155         if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
 156                 pr_err("MPTABLE: bad signature [%c%c%c%c]!\n",
 157                        mpc->signature[0], mpc->signature[1],
 158                        mpc->signature[2], mpc->signature[3]);
 159                 return 0;
 160         }
 161         if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
 162                 pr_err("MPTABLE: checksum error!\n");
 163                 return 0;
 164         }
 165         if (mpc->spec != 0x01 && mpc->spec != 0x04) {
 166                 pr_err("MPTABLE: bad table version (%d)!!\n", mpc->spec);
 167                 return 0;
 168         }
 169         if (!mpc->lapic) {
 170                 pr_err("MPTABLE: null local APIC address!\n");
 171                 return 0;
 172         }
 173         memcpy(oem, mpc->oem, 8);
 174         oem[8] = 0;
 175         pr_info("MPTABLE: OEM ID: %s\n", oem);
 176
 177         memcpy(str, mpc->productid, 12);
 178         str[12] = 0;
 179
 180         pr_info("MPTABLE: Product ID: %s\n", str);
 181
 182         pr_info("MPTABLE: APIC at: 0x%X\n", mpc->lapic);
 183
 184         return 1;
 185 }
 186
 187 static void skip_entry(unsigned char **ptr, int *count, int size)
 188 {
 189         *ptr += size;
 190         *count += size;
 191 }
 192
 193 static void __init smp_dump_mptable(struct mpc_table *mpc, unsigned char *mpt)
 194 {
 195         pr_err("Your mptable is wrong, contact your HW vendor!\n");
 196         pr_cont("type %x\n", *mpt);
 197         print_hex_dump(KERN_ERR, "  ", DUMP_PREFIX_ADDRESS, 16,
 198                         1, mpc, mpc->length, 1);
 199 }
 200
 201 void __init default_smp_read_mpc_oem(struct mpc_table *mpc) { }
 202
 203 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
 204 {
 205         char str[16];
 206         char oem[10];
 207
 208         int count = sizeof(*mpc);
 209         unsigned char *mpt = ((unsigned char *)mpc) + count;
 210
 211         if (!smp_check_mpc(mpc, oem, str))
 212                 return 0;
 213
 214         /* Initialize the lapic mapping */
 215         if (!acpi_lapic)
 216                 register_lapic_address(mpc->lapic);
 217
 218         if (early)
 219                 return 1;
 220
 221         if (mpc->oemptr)
 222                 x86_init.mpparse.smp_read_mpc_oem(mpc);
 223
 224         /*
 225          *      Now process the configuration blocks.
 226          */
 227         x86_init.mpparse.mpc_record(0);
 228
 229         while (count < mpc->length) {
 230                 switch (*mpt) {
 231                 case MP_PROCESSOR:
 232                         /* ACPI may have already provided this data */
 233                         if (!acpi_lapic)
 234                                 MP_processor_info((struct mpc_cpu *)mpt);
 235                         skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
 236                         break;
 237                 case MP_BUS:
 238                         MP_bus_info((struct mpc_bus *)mpt);
 239                         skip_entry(&mpt, &count, sizeof(struct mpc_bus));
 240                         break;
 241                 case MP_IOAPIC:
 242                         MP_ioapic_info((struct mpc_ioapic *)mpt);
 243                         skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
 244                         break;
 245                 case MP_INTSRC:
 246                         mp_save_irq((struct mpc_intsrc *)mpt);
 247                         skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
 248                         break;
 249                 case MP_LINTSRC:
 250                         MP_lintsrc_info((struct mpc_lintsrc *)mpt);
 251                         skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
 252                         break;
 253                 default:
 254                         /* wrong mptable */
 255                         smp_dump_mptable(mpc, mpt);
 256                         count = mpc->length;
 257                         break;
 258                 }
 259                 x86_init.mpparse.mpc_record(1);
 260         }
 261
 262         if (!num_processors)
 263                 pr_err("MPTABLE: no processors registered!\n");
 264         return num_processors;
 265 }
 266
 267 #ifdef CONFIG_X86_IO_APIC
 268
 269 static int __init ELCR_trigger(unsigned int irq)
 270 {
 271         unsigned int port;
 272
 273         port = 0x4d0 + (irq >> 3);
 274         return (inb(port) >> (irq & 7)) & 1;
 275 }
 276
 277 static void __init construct_default_ioirq_mptable(int mpc_default_type)
 278 {
 279         struct mpc_intsrc intsrc;
 280         int i;
 281         int ELCR_fallback = 0;
 282
 283         intsrc.type = MP_INTSRC;
 284         intsrc.irqflag = 0;     /* conforming */
 285         intsrc.srcbus = 0;
 286         intsrc.dstapic = mpc_ioapic_id(0);
 287
 288         intsrc.irqtype = mp_INT;
 289
 290         /*
 291          *  If true, we have an ISA/PCI system with no IRQ entries
 292          *  in the MP table. To prevent the PCI interrupts from being set up
 293          *  incorrectly, we try to use the ELCR. The sanity check to see if
 294          *  there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
 295          *  never be level sensitive, so we simply see if the ELCR agrees.
 296          *  If it does, we assume it's valid.
 297          */
 298         if (mpc_default_type == 5) {
 299                 pr_info("ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
 300
 301                 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
 302                     ELCR_trigger(13))
 303                         pr_err("ELCR contains invalid data... not using ELCR\n");
 304                 else {
 305                         pr_info("Using ELCR to identify PCI interrupts\n");
 306                         ELCR_fallback = 1;
 307                 }
 308         }
 309
 310         for (i = 0; i < 16; i++) {
 311                 switch (mpc_default_type) {
 312                 case 2:
 313                         if (i == 0 || i == 13)
 314                                 continue;       /* IRQ0 & IRQ13 not connected */
 315                         /* fall through */
 316                 default:
 317                         if (i == 2)
 318                                 continue;       /* IRQ2 is never connected */
 319                 }
 320
 321                 if (ELCR_fallback) {
 322                         /*
 323                          *  If the ELCR indicates a level-sensitive interrupt, we
 324                          *  copy that information over to the MP table in the
 325                          *  irqflag field (level sensitive, active high polarity).
 326                          */
 327                         if (ELCR_trigger(i))
 328                                 intsrc.irqflag = 13;
 329                         else
 330                                 intsrc.irqflag = 0;
 331                 }
 332
 333                 intsrc.srcbusirq = i;
 334                 intsrc.dstirq = i ? i : 2;      /* IRQ0 to INTIN2 */
 335                 mp_save_irq(&intsrc);
 336         }
 337
 338         intsrc.irqtype = mp_ExtINT;
 339         intsrc.srcbusirq = 0;
 340         intsrc.dstirq = 0;      /* 8259A to INTIN0 */
 341         mp_save_irq(&intsrc);
 342 }
 343
 344
 345 static void __init construct_ioapic_table(int mpc_default_type)
 346 {
 347         struct mpc_ioapic ioapic;
 348         struct mpc_bus bus;
 349
 350         bus.type = MP_BUS;
 351         bus.busid = 0;
 352         switch (mpc_default_type) {
 353         default:
 354                 pr_err("???\nUnknown standard configuration %d\n",
 355                        mpc_default_type);
 356                 /* fall through */
 357         case 1:
 358         case 5:
 359                 memcpy(bus.bustype, "ISA   ", 6);
 360                 break;
 361         case 2:
 362         case 6:
 363         case 3:
 364                 memcpy(bus.bustype, "EISA  ", 6);
 365                 break;
 366         }
 367         MP_bus_info(&bus);
 368         if (mpc_default_type > 4) {
 369                 bus.busid = 1;
 370                 memcpy(bus.bustype, "PCI   ", 6);
 371                 MP_bus_info(&bus);
 372         }
 373
 374         ioapic.type     = MP_IOAPIC;
 375         ioapic.apicid   = 2;
 376         ioapic.apicver  = mpc_default_type > 4 ? 0x10 : 0x01;
 377         ioapic.flags    = MPC_APIC_USABLE;
 378         ioapic.apicaddr = IO_APIC_DEFAULT_PHYS_BASE;
 379         MP_ioapic_info(&ioapic);
 380
 381         /*
 382          * We set up most of the low 16 IO-APIC pins according to MPS rules.
 383          */
 384         construct_default_ioirq_mptable(mpc_default_type);
 385 }
 386 #else
 387 static inline void __init construct_ioapic_table(int mpc_default_type) { }
 388 #endif
 389
 390 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
 391 {
 392         struct mpc_cpu processor;
 393         struct mpc_lintsrc lintsrc;
 394         int linttypes[2] = { mp_ExtINT, mp_NMI };
 395         int i;
 396
 397         /*
 398          * local APIC has default address
 399          */
 400         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 401
 402         /*
 403          * 2 CPUs, numbered 0 & 1.
 404          */
 405         processor.type = MP_PROCESSOR;
 406         /* Either an integrated APIC or a discrete 82489DX. */
 407         processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 408         processor.cpuflag = CPU_ENABLED;
 409         processor.cpufeature = (boot_cpu_data.x86 << 8) |
 410             (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_stepping;
 411         processor.featureflag = boot_cpu_data.x86_capability[CPUID_1_EDX];
 412         processor.reserved[0] = 0;
 413         processor.reserved[1] = 0;
 414         for (i = 0; i < 2; i++) {
 415                 processor.apicid = i;
 416                 MP_processor_info(&processor);
 417         }
 418
 419         construct_ioapic_table(mpc_default_type);
 420
 421         lintsrc.type = MP_LINTSRC;
 422         lintsrc.irqflag = 0;            /* conforming */
 423         lintsrc.srcbusid = 0;
 424         lintsrc.srcbusirq = 0;
 425         lintsrc.destapic = MP_APIC_ALL;
 426         for (i = 0; i < 2; i++) {
 427                 lintsrc.irqtype = linttypes[i];
 428                 lintsrc.destapiclint = i;
 429                 MP_lintsrc_info(&lintsrc);
 430         }
 431 }
 432
 433 static unsigned long mpf_base;
 434 static bool mpf_found;
 435
 436 static unsigned long __init get_mpc_size(unsigned long physptr)
 437 {
 438         struct mpc_table *mpc;
 439         unsigned long size;
 440
 441         mpc = early_memremap(physptr, PAGE_SIZE);
 442         size = mpc->length;
 443         early_memunmap(mpc, PAGE_SIZE);
 444         apic_printk(APIC_VERBOSE, "  mpc: %lx-%lx\n", physptr, physptr + size);
 445
 446         return size;
 447 }
 448
 449 static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
 450 {
 451         struct mpc_table *mpc;
 452         unsigned long size;
 453
 454         size = get_mpc_size(mpf->physptr);
 455         mpc = early_memremap(mpf->physptr, size);
 456
 457         /*
 458          * Read the physical hardware table.  Anything here will
 459          * override the defaults.
 460          */
 461         if (!smp_read_mpc(mpc, early)) {
 462 #ifdef CONFIG_X86_LOCAL_APIC
 463                 smp_found_config = 0;
 464 #endif
 465                 pr_err("BIOS bug, MP table errors detected!...\n");
 466                 pr_cont("... disabling SMP support. (tell your hw vendor)\n");
 467                 early_memunmap(mpc, size);
 468                 return -1;
 469         }
 470         early_memunmap(mpc, size);
 471
 472         if (early)
 473                 return -1;
 474
 475 #ifdef CONFIG_X86_IO_APIC
 476         /*
 477          * If there are no explicit MP IRQ entries, then we are
 478          * broken.  We set up most of the low 16 IO-APIC pins to
 479          * ISA defaults and hope it will work.
 480          */
 481         if (!mp_irq_entries) {
 482                 struct mpc_bus bus;
 483
 484                 pr_err("BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
 485
 486                 bus.type = MP_BUS;
 487                 bus.busid = 0;
 488                 memcpy(bus.bustype, "ISA   ", 6);
 489                 MP_bus_info(&bus);
 490
 491                 construct_default_ioirq_mptable(0);
 492         }
 493 #endif
 494
 495         return 0;
 496 }
 497
 498 /*
 499  * Scan the memory blocks for an SMP configuration block.
 500  */
 501 void __init default_get_smp_config(unsigned int early)
 502 {
 503         struct mpf_intel *mpf;
 504
 505         if (!smp_found_config)
 506                 return;
 507
 508         if (!mpf_found)
 509                 return;
 510
 511         if (acpi_lapic && early)
 512                 return;
 513
 514         /*
 515          * MPS doesn't support hyperthreading, aka only have
 516          * thread 0 apic id in MPS table
 517          */
 518         if (acpi_lapic && acpi_ioapic)
 519                 return;
 520
 521         mpf = early_memremap(mpf_base, sizeof(*mpf));
 522         if (!mpf) {
 523                 pr_err("MPTABLE: error mapping MP table\n");
 524                 return;
 525         }
 526
 527         pr_info("Intel MultiProcessor Specification v1.%d\n",
 528                 mpf->specification);
 529 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
 530         if (mpf->feature2 & (1 << 7)) {
 531                 pr_info("    IMCR and PIC compatibility mode.\n");
 532                 pic_mode = 1;
 533         } else {
 534                 pr_info("    Virtual Wire compatibility mode.\n");
 535                 pic_mode = 0;
 536         }
 537 #endif
 538         /*
 539          * Now see if we need to read further.
 540          */
 541         if (mpf->feature1) {
 542                 if (early) {
 543                         /*
 544                          * local APIC has default address
 545                          */
 546                         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 547                         return;
 548                 }
 549
 550                 pr_info("Default MP configuration #%d\n", mpf->feature1);
 551                 construct_default_ISA_mptable(mpf->feature1);
 552
 553         } else if (mpf->physptr) {
 554                 if (check_physptr(mpf, early)) {
 555                         early_memunmap(mpf, sizeof(*mpf));
 556                         return;
 557                 }
 558         } else
 559                 BUG();
 560
 561         if (!early)
 562                 pr_info("Processors: %d\n", num_processors);
 563         /*
 564          * Only use the first configuration found.
 565          */
 566
 567         early_memunmap(mpf, sizeof(*mpf));
 568 }
 569
 570 static void __init smp_reserve_memory(struct mpf_intel *mpf)
 571 {
 572         memblock_reserve(mpf->physptr, get_mpc_size(mpf->physptr));
 573 }
 574
 575 static int __init smp_scan_config(unsigned long base, unsigned long length)
 576 {
 577         unsigned int *bp;
 578         struct mpf_intel *mpf;
 579         int ret = 0;
 580
 581         apic_printk(APIC_VERBOSE, "Scan for SMP in [mem %#010lx-%#010lx]\n",
 582                     base, base + length - 1);
 583         BUILD_BUG_ON(sizeof(*mpf) != 16);
 584
 585         while (length > 0) {
 586                 bp = early_memremap(base, length);
 587                 mpf = (struct mpf_intel *)bp;
 588                 if ((*bp == SMP_MAGIC_IDENT) &&
 589                     (mpf->length == 1) &&
 590                     !mpf_checksum((unsigned char *)bp, 16) &&
 591                     ((mpf->specification == 1)
 592                      || (mpf->specification == 4))) {
 593 #ifdef CONFIG_X86_LOCAL_APIC
 594                         smp_found_config = 1;
 595 #endif
 596                         mpf_base = base;
 597                         mpf_found = true;
 598
 599                         pr_info("found SMP MP-table at [mem %#010lx-%#010lx] mapped at [%p]\n",
 600                                 base, base + sizeof(*mpf) - 1, mpf);
 601
 602                         memblock_reserve(base, sizeof(*mpf));
 603                         if (mpf->physptr)
 604                                 smp_reserve_memory(mpf);
 605
 606                         ret = 1;
 607                 }
 608                 early_memunmap(bp, length);
 609
 610                 if (ret)
 611                         break;
 612
 613                 base += 16;
 614                 length -= 16;
 615         }
 616         return ret;
 617 }
 618
 619 void __init default_find_smp_config(void)
 620 {
 621         unsigned int address;
 622
 623         /*
 624          * FIXME: Linux assumes you have 640K of base ram..
 625          * this continues the error...
 626          *
 627          * 1) Scan the bottom 1K for a signature
 628          * 2) Scan the top 1K of base RAM
 629          * 3) Scan the 64K of bios
 630          */
 631         if (smp_scan_config(0x0, 0x400) ||
 632             smp_scan_config(639 * 0x400, 0x400) ||
 633             smp_scan_config(0xF0000, 0x10000))
 634                 return;
 635         /*
 636          * If it is an SMP machine we should know now, unless the
 637          * configuration is in an EISA bus machine with an
 638          * extended bios data area.
 639          *
 640          * there is a real-mode segmented pointer pointing to the
 641          * 4K EBDA area at 0x40E, calculate and scan it here.
 642          *
 643          * NOTE! There are Linux loaders that will corrupt the EBDA
 644          * area, and as such this kind of SMP config may be less
 645          * trustworthy, simply because the SMP table may have been
 646          * stomped on during early boot. These loaders are buggy and
 647          * should be fixed.
 648          *
 649          * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
 650          */
 651
 652         address = get_bios_ebda();
 653         if (address)
 654                 smp_scan_config(address, 0x400);
 655 }
 656
 657 #ifdef CONFIG_X86_IO_APIC
 658 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
 659
 660 static int  __init get_MP_intsrc_index(struct mpc_intsrc *m)
 661 {
 662         int i;
 663
 664         if (m->irqtype != mp_INT)
 665                 return 0;
 666
 667         if (m->irqflag != 0x0f)
 668                 return 0;
 669
 670         /* not legacy */
 671
 672         for (i = 0; i < mp_irq_entries; i++) {
 673                 if (mp_irqs[i].irqtype != mp_INT)
 674                         continue;
 675
 676                 if (mp_irqs[i].irqflag != 0x0f)
 677                         continue;
 678
 679                 if (mp_irqs[i].srcbus != m->srcbus)
 680                         continue;
 681                 if (mp_irqs[i].srcbusirq != m->srcbusirq)
 682                         continue;
 683                 if (irq_used[i]) {
 684                         /* already claimed */
 685                         return -2;
 686                 }
 687                 irq_used[i] = 1;
 688                 return i;
 689         }
 690
 691         /* not found */
 692         return -1;
 693 }
 694
 695 #define SPARE_SLOT_NUM 20
 696
 697 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
 698
 699 static void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
 700 {
 701         int i;
 702
 703         apic_printk(APIC_VERBOSE, "OLD ");
 704         print_mp_irq_info(m);
 705
 706         i = get_MP_intsrc_index(m);
 707         if (i > 0) {
 708                 memcpy(m, &mp_irqs[i], sizeof(*m));
 709                 apic_printk(APIC_VERBOSE, "NEW ");
 710                 print_mp_irq_info(&mp_irqs[i]);
 711                 return;
 712         }
 713         if (!i) {
 714                 /* legacy, do nothing */
 715                 return;
 716         }
 717         if (*nr_m_spare < SPARE_SLOT_NUM) {
 718                 /*
 719                  * not found (-1), or duplicated (-2) are invalid entries,
 720                  * we need to use the slot later
 721                  */
 722                 m_spare[*nr_m_spare] = m;
 723                 *nr_m_spare += 1;
 724         }
 725 }
 726
 727 static int __init
 728 check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count)
 729 {
 730         if (!mpc_new_phys || count <= mpc_new_length) {
 731                 WARN(1, "update_mptable: No spare slots (length: %x)\n", count);
 732                 return -1;
 733         }
 734
 735         return 0;
 736 }
 737 #else /* CONFIG_X86_IO_APIC */
 738 static
 739 inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {}
 740 #endif /* CONFIG_X86_IO_APIC */
 741
 742 static int  __init replace_intsrc_all(struct mpc_table *mpc,
 743                                         unsigned long mpc_new_phys,
 744                                         unsigned long mpc_new_length)
 745 {
 746 #ifdef CONFIG_X86_IO_APIC
 747         int i;
 748 #endif
 749         int count = sizeof(*mpc);
 750         int nr_m_spare = 0;
 751         unsigned char *mpt = ((unsigned char *)mpc) + count;
 752
 753         pr_info("mpc_length %x\n", mpc->length);
 754         while (count < mpc->length) {
 755                 switch (*mpt) {
 756                 case MP_PROCESSOR:
 757                         skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
 758                         break;
 759                 case MP_BUS:
 760                         skip_entry(&mpt, &count, sizeof(struct mpc_bus));
 761                         break;
 762                 case MP_IOAPIC:
 763                         skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
 764                         break;
 765                 case MP_INTSRC:
 766                         check_irq_src((struct mpc_intsrc *)mpt, &nr_m_spare);
 767                         skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
 768                         break;
 769                 case MP_LINTSRC:
 770                         skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
 771                         break;
 772                 default:
 773                         /* wrong mptable */
 774                         smp_dump_mptable(mpc, mpt);
 775                         goto out;
 776                 }
 777         }
 778
 779 #ifdef CONFIG_X86_IO_APIC
 780         for (i = 0; i < mp_irq_entries; i++) {
 781                 if (irq_used[i])
 782                         continue;
 783
 784                 if (mp_irqs[i].irqtype != mp_INT)
 785                         continue;
 786
 787                 if (mp_irqs[i].irqflag != 0x0f)
 788                         continue;
 789
 790                 if (nr_m_spare > 0) {
 791                         apic_printk(APIC_VERBOSE, "*NEW* found\n");
 792                         nr_m_spare--;
 793                         memcpy(m_spare[nr_m_spare], &mp_irqs[i], sizeof(mp_irqs[i]));
 794                         m_spare[nr_m_spare] = NULL;
 795                 } else {
 796                         struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
 797                         count += sizeof(struct mpc_intsrc);
 798                         if (check_slot(mpc_new_phys, mpc_new_length, count) < 0)
 799                                 goto out;
 800                         memcpy(m, &mp_irqs[i], sizeof(*m));
 801                         mpc->length = count;
 802                         mpt += sizeof(struct mpc_intsrc);
 803                 }
 804                 print_mp_irq_info(&mp_irqs[i]);
 805         }
 806 #endif
 807 out:
 808         /* update checksum */
 809         mpc->checksum = 0;
 810         mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
 811
 812         return 0;
 813 }
 814
 815 int enable_update_mptable;
 816
 817 static int __init update_mptable_setup(char *str)
 818 {
 819         enable_update_mptable = 1;
 820 #ifdef CONFIG_PCI
 821         pci_routeirq = 1;
 822 #endif
 823         return 0;
 824 }
 825 early_param("update_mptable", update_mptable_setup);
 826
 827 static unsigned long __initdata mpc_new_phys;
 828 static unsigned long mpc_new_length __initdata = 4096;
 829
 830 /* alloc_mptable or alloc_mptable=4k */
 831 static int __initdata alloc_mptable;
 832 static int __init parse_alloc_mptable_opt(char *p)
 833 {
 834         enable_update_mptable = 1;
 835 #ifdef CONFIG_PCI
 836         pci_routeirq = 1;
 837 #endif
 838         alloc_mptable = 1;
 839         if (!p)
 840                 return 0;
 841         mpc_new_length = memparse(p, &p);
 842         return 0;
 843 }
 844 early_param("alloc_mptable", parse_alloc_mptable_opt);
 845
 846 void __init e820__memblock_alloc_reserved_mpc_new(void)
 847 {
 848         if (enable_update_mptable && alloc_mptable)
 849                 mpc_new_phys = e820__memblock_alloc_reserved(mpc_new_length, 4);
 850 }
 851
 852 static int __init update_mp_table(void)
 853 {
 854         char str[16];
 855         char oem[10];
 856         struct mpf_intel *mpf;
 857         struct mpc_table *mpc, *mpc_new;
 858         unsigned long size;
 859
 860         if (!enable_update_mptable)
 861                 return 0;
 862
 863         if (!mpf_found)
 864                 return 0;
 865
 866         mpf = early_memremap(mpf_base, sizeof(*mpf));
 867         if (!mpf) {
 868                 pr_err("MPTABLE: mpf early_memremap() failed\n");
 869                 return 0;
 870         }
 871
 872         /*
 873          * Now see if we need to go further.
 874          */
 875         if (mpf->feature1)
 876                 goto do_unmap_mpf;
 877
 878         if (!mpf->physptr)
 879                 goto do_unmap_mpf;
 880
 881         size = get_mpc_size(mpf->physptr);
 882         mpc = early_memremap(mpf->physptr, size);
 883         if (!mpc) {
 884                 pr_err("MPTABLE: mpc early_memremap() failed\n");
 885                 goto do_unmap_mpf;
 886         }
 887
 888         if (!smp_check_mpc(mpc, oem, str))
 889                 goto do_unmap_mpc;
 890
 891         pr_info("mpf: %llx\n", (u64)mpf_base);
 892         pr_info("physptr: %x\n", mpf->physptr);
 893
 894         if (mpc_new_phys && mpc->length > mpc_new_length) {
 895                 mpc_new_phys = 0;
 896                 pr_info("mpc_new_length is %ld, please use alloc_mptable=8k\n",
 897                         mpc_new_length);
 898         }
 899
 900         if (!mpc_new_phys) {
 901                 unsigned char old, new;
 902                 /* check if we can change the position */
 903                 mpc->checksum = 0;
 904                 old = mpf_checksum((unsigned char *)mpc, mpc->length);
 905                 mpc->checksum = 0xff;
 906                 new = mpf_checksum((unsigned char *)mpc, mpc->length);
 907                 if (old == new) {
 908                         pr_info("mpc is readonly, please try alloc_mptable instead\n");
 909                         goto do_unmap_mpc;
 910                 }
 911                 pr_info("use in-position replacing\n");
 912         } else {
 913                 mpc_new = early_memremap(mpc_new_phys, mpc_new_length);
 914                 if (!mpc_new) {
 915                         pr_err("MPTABLE: new mpc early_memremap() failed\n");
 916                         goto do_unmap_mpc;
 917                 }
 918                 mpf->physptr = mpc_new_phys;
 919                 memcpy(mpc_new, mpc, mpc->length);
 920                 early_memunmap(mpc, size);
 921                 mpc = mpc_new;
 922                 size = mpc_new_length;
 923                 /* check if we can modify that */
 924                 if (mpc_new_phys - mpf->physptr) {
 925                         struct mpf_intel *mpf_new;
 926                         /* steal 16 bytes from [0, 1k) */
 927                         mpf_new = early_memremap(0x400 - 16, sizeof(*mpf_new));
 928                         if (!mpf_new) {
 929                                 pr_err("MPTABLE: new mpf early_memremap() failed\n");
 930                                 goto do_unmap_mpc;
 931                         }
 932                         pr_info("mpf new: %x\n", 0x400 - 16);
 933                         memcpy(mpf_new, mpf, 16);
 934                         early_memunmap(mpf, sizeof(*mpf));
 935                         mpf = mpf_new;
 936                         mpf->physptr = mpc_new_phys;
 937                 }
 938                 mpf->checksum = 0;
 939                 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
 940                 pr_info("physptr new: %x\n", mpf->physptr);
 941         }
 942
 943         /*
 944          * only replace the one with mp_INT and
 945          *       MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
 946          * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
 947          * may need pci=routeirq for all coverage
 948          */
 949         replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
 950
 951 do_unmap_mpc:
 952         early_memunmap(mpc, size);
 953
 954 do_unmap_mpf:
 955         early_memunmap(mpf, sizeof(*mpf));
 956
 957         return 0;
 958 }
 959
 960 late_initcall(update_mp_table);