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 #include <linux/pci.h>
  21
  22 #include <asm/mtrr.h>
  23 #include <asm/mpspec.h>
  24 #include <asm/pgalloc.h>
  25 #include <asm/io_apic.h>
  26 #include <asm/proto.h>
  27 #include <asm/bios_ebda.h>
  28 #include <asm/e820.h>
  29 #include <asm/trampoline.h>
  30 #include <asm/setup.h>
  31 #include <asm/smp.h>
  32
  33 #include <asm/apic.h>
  34 /*
  35  * Checksum an MP configuration block.
  36  */
  37
  38 static int __init mpf_checksum(unsigned char *mp, int len)
  39 {
  40         int sum = 0;
  41
  42         while (len--)
  43                 sum += *mp++;
  44
  45         return sum & 0xFF;
  46 }
  47
  48 int __init default_mpc_apic_id(struct mpc_cpu *m)
  49 {
  50         return m->apicid;
  51 }
  52
  53 static void __init MP_processor_info(struct mpc_cpu *m)
  54 {
  55         int apicid;
  56         char *bootup_cpu = "";
  57
  58         if (!(m->cpuflag & CPU_ENABLED)) {
  59                 disabled_cpus++;
  60                 return;
  61         }
  62
  63         apicid = x86_init.mpparse.mpc_apic_id(m);
  64
  65         if (m->cpuflag & CPU_BOOTPROCESSOR) {
  66                 bootup_cpu = " (Bootup-CPU)";
  67                 boot_cpu_physical_apicid = m->apicid;
  68         }
  69
  70         printk(KERN_INFO "Processor #%d%s\n", m->apicid, bootup_cpu);
  71         generic_processor_info(apicid, m->apicver);
  72 }
  73
  74 #ifdef CONFIG_X86_IO_APIC
  75 void __init default_mpc_oem_bus_info(struct mpc_bus *m, char *str)
  76 {
  77         memcpy(str, m->bustype, 6);
  78         str[6] = 0;
  79         apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
  80 }
  81
  82 static void __init MP_bus_info(struct mpc_bus *m)
  83 {
  84         char str[7];
  85
  86         x86_init.mpparse.mpc_oem_bus_info(m, 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_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 #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
 118 static int bad_ioapic(unsigned long address)
 119 {
 120         if (nr_ioapics >= MAX_IO_APICS) {
 121                 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
 122                        "(found %d)\n", MAX_IO_APICS, nr_ioapics);
 123                 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
 124         }
 125         if (!address) {
 126                 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
 127                        " found in table, skipping!\n");
 128                 return 1;
 129         }
 130         return 0;
 131 }
 132
 133 static void __init MP_ioapic_info(struct mpc_ioapic *m)
 134 {
 135         if (!(m->flags & MPC_APIC_USABLE))
 136                 return;
 137
 138         printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
 139                m->apicid, m->apicver, m->apicaddr);
 140
 141         if (bad_ioapic(m->apicaddr))
 142                 return;
 143
 144         mp_ioapics[nr_ioapics].apicaddr = m->apicaddr;
 145         mp_ioapics[nr_ioapics].apicid = m->apicid;
 146         mp_ioapics[nr_ioapics].type = m->type;
 147         mp_ioapics[nr_ioapics].apicver = m->apicver;
 148         mp_ioapics[nr_ioapics].flags = m->flags;
 149         nr_ioapics++;
 150 }
 151
 152 static void print_MP_intsrc_info(struct mpc_intsrc *m)
 153 {
 154         apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
 155                 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
 156                 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
 157                 m->srcbusirq, m->dstapic, m->dstirq);
 158 }
 159
 160 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
 161 {
 162         apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
 163                 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
 164                 mp_irq->irqtype, mp_irq->irqflag & 3,
 165                 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
 166                 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
 167 }
 168
 169 static void __init assign_to_mp_irq(struct mpc_intsrc *m,
 170                                     struct mpc_intsrc *mp_irq)
 171 {
 172         mp_irq->dstapic = m->dstapic;
 173         mp_irq->type = m->type;
 174         mp_irq->irqtype = m->irqtype;
 175         mp_irq->irqflag = m->irqflag;
 176         mp_irq->srcbus = m->srcbus;
 177         mp_irq->srcbusirq = m->srcbusirq;
 178         mp_irq->dstirq = m->dstirq;
 179 }
 180
 181 static void __init assign_to_mpc_intsrc(struct mpc_intsrc *mp_irq,
 182                                         struct mpc_intsrc *m)
 183 {
 184         m->dstapic = mp_irq->dstapic;
 185         m->type = mp_irq->type;
 186         m->irqtype = mp_irq->irqtype;
 187         m->irqflag = mp_irq->irqflag;
 188         m->srcbus = mp_irq->srcbus;
 189         m->srcbusirq = mp_irq->srcbusirq;
 190         m->dstirq = mp_irq->dstirq;
 191 }
 192
 193 static int __init mp_irq_mpc_intsrc_cmp(struct mpc_intsrc *mp_irq,
 194                                         struct mpc_intsrc *m)
 195 {
 196         if (mp_irq->dstapic != m->dstapic)
 197                 return 1;
 198         if (mp_irq->type != m->type)
 199                 return 2;
 200         if (mp_irq->irqtype != m->irqtype)
 201                 return 3;
 202         if (mp_irq->irqflag != m->irqflag)
 203                 return 4;
 204         if (mp_irq->srcbus != m->srcbus)
 205                 return 5;
 206         if (mp_irq->srcbusirq != m->srcbusirq)
 207                 return 6;
 208         if (mp_irq->dstirq != m->dstirq)
 209                 return 7;
 210
 211         return 0;
 212 }
 213
 214 static void __init MP_intsrc_info(struct mpc_intsrc *m)
 215 {
 216         int i;
 217
 218         print_MP_intsrc_info(m);
 219
 220         for (i = 0; i < mp_irq_entries; i++) {
 221                 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
 222                         return;
 223         }
 224
 225         assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
 226         if (++mp_irq_entries == MAX_IRQ_SOURCES)
 227                 panic("Max # of irq sources exceeded!!\n");
 228 }
 229 #else /* CONFIG_X86_IO_APIC */
 230 static inline void __init MP_bus_info(struct mpc_bus *m) {}
 231 static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
 232 static inline void __init MP_intsrc_info(struct mpc_intsrc *m) {}
 233 #endif /* CONFIG_X86_IO_APIC */
 234
 235
 236 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
 237 {
 238         apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
 239                 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
 240                 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
 241                 m->srcbusirq, m->destapic, m->destapiclint);
 242 }
 243
 244 /*
 245  * Read/parse the MPC
 246  */
 247
 248 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
 249 {
 250
 251         if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
 252                 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
 253                        mpc->signature[0], mpc->signature[1],
 254                        mpc->signature[2], mpc->signature[3]);
 255                 return 0;
 256         }
 257         if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
 258                 printk(KERN_ERR "MPTABLE: checksum error!\n");
 259                 return 0;
 260         }
 261         if (mpc->spec != 0x01 && mpc->spec != 0x04) {
 262                 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
 263                        mpc->spec);
 264                 return 0;
 265         }
 266         if (!mpc->lapic) {
 267                 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
 268                 return 0;
 269         }
 270         memcpy(oem, mpc->oem, 8);
 271         oem[8] = 0;
 272         printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
 273
 274         memcpy(str, mpc->productid, 12);
 275         str[12] = 0;
 276
 277         printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
 278
 279         printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic);
 280
 281         return 1;
 282 }
 283
 284 static void skip_entry(unsigned char **ptr, int *count, int size)
 285 {
 286         *ptr += size;
 287         *count += size;
 288 }
 289
 290 static void __init smp_dump_mptable(struct mpc_table *mpc, unsigned char *mpt)
 291 {
 292         printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n"
 293                 "type %x\n", *mpt);
 294         print_hex_dump(KERN_ERR, "  ", DUMP_PREFIX_ADDRESS, 16,
 295                         1, mpc, mpc->length, 1);
 296 }
 297
 298 void __init default_smp_read_mpc_oem(struct mpc_table *mpc) { }
 299
 300 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
 301 {
 302         char str[16];
 303         char oem[10];
 304
 305         int count = sizeof(*mpc);
 306         unsigned char *mpt = ((unsigned char *)mpc) + count;
 307
 308         if (!smp_check_mpc(mpc, oem, str))
 309                 return 0;
 310
 311 #ifdef CONFIG_X86_32
 312         generic_mps_oem_check(mpc, oem, str);
 313 #endif
 314         /* save the local APIC address, it might be non-default */
 315         if (!acpi_lapic)
 316                 mp_lapic_addr = mpc->lapic;
 317
 318         if (early)
 319                 return 1;
 320
 321         if (mpc->oemptr)
 322                 x86_init.mpparse.smp_read_mpc_oem(mpc);
 323
 324         /*
 325          *      Now process the configuration blocks.
 326          */
 327         x86_init.mpparse.mpc_record(0);
 328
 329         while (count < mpc->length) {
 330                 switch (*mpt) {
 331                 case MP_PROCESSOR:
 332                         /* ACPI may have already provided this data */
 333                         if (!acpi_lapic)
 334                                 MP_processor_info((struct mpc_cpu *)mpt);
 335                         skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
 336                         break;
 337                 case MP_BUS:
 338                         MP_bus_info((struct mpc_bus *)mpt);
 339                         skip_entry(&mpt, &count, sizeof(struct mpc_bus));
 340                         break;
 341                 case MP_IOAPIC:
 342                         MP_ioapic_info((struct mpc_ioapic *)mpt);
 343                         skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
 344                         break;
 345                 case MP_INTSRC:
 346                         MP_intsrc_info((struct mpc_intsrc *)mpt);
 347                         skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
 348                         break;
 349                 case MP_LINTSRC:
 350                         MP_lintsrc_info((struct mpc_lintsrc *)mpt);
 351                         skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
 352                         break;
 353                 default:
 354                         /* wrong mptable */
 355                         smp_dump_mptable(mpc, mpt);
 356                         count = mpc->length;
 357                         break;
 358                 }
 359                 x86_init.mpparse.mpc_record(1);
 360         }
 361
 362 #ifdef CONFIG_X86_BIGSMP
 363         generic_bigsmp_probe();
 364 #endif
 365
 366         if (apic->setup_apic_routing)
 367                 apic->setup_apic_routing();
 368
 369         if (!num_processors)
 370                 printk(KERN_ERR "MPTABLE: no processors registered!\n");
 371         return num_processors;
 372 }
 373
 374 #ifdef CONFIG_X86_IO_APIC
 375
 376 static int __init ELCR_trigger(unsigned int irq)
 377 {
 378         unsigned int port;
 379
 380         port = 0x4d0 + (irq >> 3);
 381         return (inb(port) >> (irq & 7)) & 1;
 382 }
 383
 384 static void __init construct_default_ioirq_mptable(int mpc_default_type)
 385 {
 386         struct mpc_intsrc intsrc;
 387         int i;
 388         int ELCR_fallback = 0;
 389
 390         intsrc.type = MP_INTSRC;
 391         intsrc.irqflag = 0;     /* conforming */
 392         intsrc.srcbus = 0;
 393         intsrc.dstapic = mp_ioapics[0].apicid;
 394
 395         intsrc.irqtype = mp_INT;
 396
 397         /*
 398          *  If true, we have an ISA/PCI system with no IRQ entries
 399          *  in the MP table. To prevent the PCI interrupts from being set up
 400          *  incorrectly, we try to use the ELCR. The sanity check to see if
 401          *  there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
 402          *  never be level sensitive, so we simply see if the ELCR agrees.
 403          *  If it does, we assume it's valid.
 404          */
 405         if (mpc_default_type == 5) {
 406                 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
 407                        "falling back to ELCR\n");
 408
 409                 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
 410                     ELCR_trigger(13))
 411                         printk(KERN_ERR "ELCR contains invalid data... "
 412                                "not using ELCR\n");
 413                 else {
 414                         printk(KERN_INFO
 415                                "Using ELCR to identify PCI interrupts\n");
 416                         ELCR_fallback = 1;
 417                 }
 418         }
 419
 420         for (i = 0; i < 16; i++) {
 421                 switch (mpc_default_type) {
 422                 case 2:
 423                         if (i == 0 || i == 13)
 424                                 continue;       /* IRQ0 & IRQ13 not connected */
 425                         /* fall through */
 426                 default:
 427                         if (i == 2)
 428                                 continue;       /* IRQ2 is never connected */
 429                 }
 430
 431                 if (ELCR_fallback) {
 432                         /*
 433                          *  If the ELCR indicates a level-sensitive interrupt, we
 434                          *  copy that information over to the MP table in the
 435                          *  irqflag field (level sensitive, active high polarity).
 436                          */
 437                         if (ELCR_trigger(i))
 438                                 intsrc.irqflag = 13;
 439                         else
 440                                 intsrc.irqflag = 0;
 441                 }
 442
 443                 intsrc.srcbusirq = i;
 444                 intsrc.dstirq = i ? i : 2;      /* IRQ0 to INTIN2 */
 445                 MP_intsrc_info(&intsrc);
 446         }
 447
 448         intsrc.irqtype = mp_ExtINT;
 449         intsrc.srcbusirq = 0;
 450         intsrc.dstirq = 0;      /* 8259A to INTIN0 */
 451         MP_intsrc_info(&intsrc);
 452 }
 453
 454
 455 static void __init construct_ioapic_table(int mpc_default_type)
 456 {
 457         struct mpc_ioapic ioapic;
 458         struct mpc_bus bus;
 459
 460         bus.type = MP_BUS;
 461         bus.busid = 0;
 462         switch (mpc_default_type) {
 463         default:
 464                 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
 465                        mpc_default_type);
 466                 /* fall through */
 467         case 1:
 468         case 5:
 469                 memcpy(bus.bustype, "ISA   ", 6);
 470                 break;
 471         case 2:
 472         case 6:
 473         case 3:
 474                 memcpy(bus.bustype, "EISA  ", 6);
 475                 break;
 476         case 4:
 477         case 7:
 478                 memcpy(bus.bustype, "MCA   ", 6);
 479         }
 480         MP_bus_info(&bus);
 481         if (mpc_default_type > 4) {
 482                 bus.busid = 1;
 483                 memcpy(bus.bustype, "PCI   ", 6);
 484                 MP_bus_info(&bus);
 485         }
 486
 487         ioapic.type = MP_IOAPIC;
 488         ioapic.apicid = 2;
 489         ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 490         ioapic.flags = MPC_APIC_USABLE;
 491         ioapic.apicaddr = 0xFEC00000;
 492         MP_ioapic_info(&ioapic);
 493
 494         /*
 495          * We set up most of the low 16 IO-APIC pins according to MPS rules.
 496          */
 497         construct_default_ioirq_mptable(mpc_default_type);
 498 }
 499 #else
 500 static inline void __init construct_ioapic_table(int mpc_default_type) { }
 501 #endif
 502
 503 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
 504 {
 505         struct mpc_cpu processor;
 506         struct mpc_lintsrc lintsrc;
 507         int linttypes[2] = { mp_ExtINT, mp_NMI };
 508         int i;
 509
 510         /*
 511          * local APIC has default address
 512          */
 513         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 514
 515         /*
 516          * 2 CPUs, numbered 0 & 1.
 517          */
 518         processor.type = MP_PROCESSOR;
 519         /* Either an integrated APIC or a discrete 82489DX. */
 520         processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 521         processor.cpuflag = CPU_ENABLED;
 522         processor.cpufeature = (boot_cpu_data.x86 << 8) |
 523             (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
 524         processor.featureflag = boot_cpu_data.x86_capability[0];
 525         processor.reserved[0] = 0;
 526         processor.reserved[1] = 0;
 527         for (i = 0; i < 2; i++) {
 528                 processor.apicid = i;
 529                 MP_processor_info(&processor);
 530         }
 531
 532         construct_ioapic_table(mpc_default_type);
 533
 534         lintsrc.type = MP_LINTSRC;
 535         lintsrc.irqflag = 0;            /* conforming */
 536         lintsrc.srcbusid = 0;
 537         lintsrc.srcbusirq = 0;
 538         lintsrc.destapic = MP_APIC_ALL;
 539         for (i = 0; i < 2; i++) {
 540                 lintsrc.irqtype = linttypes[i];
 541                 lintsrc.destapiclint = i;
 542                 MP_lintsrc_info(&lintsrc);
 543         }
 544 }
 545
 546 static struct mpf_intel *mpf_found;
 547
 548 static unsigned long __init get_mpc_size(unsigned long physptr)
 549 {
 550         struct mpc_table *mpc;
 551         unsigned long size;
 552
 553         mpc = early_ioremap(physptr, PAGE_SIZE);
 554         size = mpc->length;
 555         early_iounmap(mpc, PAGE_SIZE);
 556         apic_printk(APIC_VERBOSE, "  mpc: %lx-%lx\n", physptr, physptr + size);
 557
 558         return size;
 559 }
 560
 561 static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
 562 {
 563         struct mpc_table *mpc;
 564         unsigned long size;
 565
 566         size = get_mpc_size(mpf->physptr);
 567         mpc = early_ioremap(mpf->physptr, size);
 568         /*
 569          * Read the physical hardware table.  Anything here will
 570          * override the defaults.
 571          */
 572         if (!smp_read_mpc(mpc, early)) {
 573 #ifdef CONFIG_X86_LOCAL_APIC
 574                 smp_found_config = 0;
 575 #endif
 576                 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n"
 577                         "... disabling SMP support. (tell your hw vendor)\n");
 578                 early_iounmap(mpc, size);
 579                 return -1;
 580         }
 581         early_iounmap(mpc, size);
 582
 583         if (early)
 584                 return -1;
 585
 586 #ifdef CONFIG_X86_IO_APIC
 587         /*
 588          * If there are no explicit MP IRQ entries, then we are
 589          * broken.  We set up most of the low 16 IO-APIC pins to
 590          * ISA defaults and hope it will work.
 591          */
 592         if (!mp_irq_entries) {
 593                 struct mpc_bus bus;
 594
 595                 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
 596                        "using default mptable. (tell your hw vendor)\n");
 597
 598                 bus.type = MP_BUS;
 599                 bus.busid = 0;
 600                 memcpy(bus.bustype, "ISA   ", 6);
 601                 MP_bus_info(&bus);
 602
 603                 construct_default_ioirq_mptable(0);
 604         }
 605 #endif
 606
 607         return 0;
 608 }
 609
 610 /*
 611  * Scan the memory blocks for an SMP configuration block.
 612  */
 613 void __init default_get_smp_config(unsigned int early)
 614 {
 615         struct mpf_intel *mpf = mpf_found;
 616
 617         if (!mpf)
 618                 return;
 619
 620         if (acpi_lapic && early)
 621                 return;
 622
 623         /*
 624          * MPS doesn't support hyperthreading, aka only have
 625          * thread 0 apic id in MPS table
 626          */
 627         if (acpi_lapic && acpi_ioapic)
 628                 return;
 629
 630         printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
 631                mpf->specification);
 632 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
 633         if (mpf->feature2 & (1 << 7)) {
 634                 printk(KERN_INFO "    IMCR and PIC compatibility mode.\n");
 635                 pic_mode = 1;
 636         } else {
 637                 printk(KERN_INFO "    Virtual Wire compatibility mode.\n");
 638                 pic_mode = 0;
 639         }
 640 #endif
 641         /*
 642          * Now see if we need to read further.
 643          */
 644         if (mpf->feature1 != 0) {
 645                 if (early) {
 646                         /*
 647                          * local APIC has default address
 648                          */
 649                         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 650                         return;
 651                 }
 652
 653                 printk(KERN_INFO "Default MP configuration #%d\n",
 654                        mpf->feature1);
 655                 construct_default_ISA_mptable(mpf->feature1);
 656
 657         } else if (mpf->physptr) {
 658                 if (check_physptr(mpf, early))
 659                         return;
 660         } else
 661                 BUG();
 662
 663         if (!early)
 664                 printk(KERN_INFO "Processors: %d\n", num_processors);
 665         /*
 666          * Only use the first configuration found.
 667          */
 668 }
 669
 670 static void __init smp_reserve_bootmem(struct mpf_intel *mpf)
 671 {
 672         unsigned long size = get_mpc_size(mpf->physptr);
 673 #ifdef CONFIG_X86_32
 674         /*
 675          * We cannot access to MPC table to compute table size yet,
 676          * as only few megabytes from the bottom is mapped now.
 677          * PC-9800's MPC table places on the very last of physical
 678          * memory; so that simply reserving PAGE_SIZE from mpf->physptr
 679          * yields BUG() in reserve_bootmem.
 680          * also need to make sure physptr is below than max_low_pfn
 681          * we don't need reserve the area above max_low_pfn
 682          */
 683         unsigned long end = max_low_pfn * PAGE_SIZE;
 684
 685         if (mpf->physptr < end) {
 686                 if (mpf->physptr + size > end)
 687                         size = end - mpf->physptr;
 688                 reserve_bootmem_generic(mpf->physptr, size, BOOTMEM_DEFAULT);
 689         }
 690 #else
 691         reserve_bootmem_generic(mpf->physptr, size, BOOTMEM_DEFAULT);
 692 #endif
 693 }
 694
 695 static int __init smp_scan_config(unsigned long base, unsigned long length,
 696                                   unsigned reserve)
 697 {
 698         unsigned int *bp = phys_to_virt(base);
 699         struct mpf_intel *mpf;
 700
 701         apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
 702                         bp, length);
 703         BUILD_BUG_ON(sizeof(*mpf) != 16);
 704
 705         while (length > 0) {
 706                 mpf = (struct mpf_intel *)bp;
 707                 if ((*bp == SMP_MAGIC_IDENT) &&
 708                     (mpf->length == 1) &&
 709                     !mpf_checksum((unsigned char *)bp, 16) &&
 710                     ((mpf->specification == 1)
 711                      || (mpf->specification == 4))) {
 712 #ifdef CONFIG_X86_LOCAL_APIC
 713                         smp_found_config = 1;
 714 #endif
 715                         mpf_found = mpf;
 716
 717                         printk(KERN_INFO "found SMP MP-table at [%p] %llx\n",
 718                                mpf, (u64)virt_to_phys(mpf));
 719
 720                         if (!reserve)
 721                                 return 1;
 722                         reserve_bootmem_generic(virt_to_phys(mpf), sizeof(*mpf),
 723                                                 BOOTMEM_DEFAULT);
 724                         if (mpf->physptr)
 725                                 smp_reserve_bootmem(mpf);
 726
 727                         return 1;
 728                 }
 729                 bp += 4;
 730                 length -= 16;
 731         }
 732         return 0;
 733 }
 734
 735 void __init default_find_smp_config(unsigned int reserve)
 736 {
 737         unsigned int address;
 738
 739         /*
 740          * FIXME: Linux assumes you have 640K of base ram..
 741          * this continues the error...
 742          *
 743          * 1) Scan the bottom 1K for a signature
 744          * 2) Scan the top 1K of base RAM
 745          * 3) Scan the 64K of bios
 746          */
 747         if (smp_scan_config(0x0, 0x400, reserve) ||
 748             smp_scan_config(639 * 0x400, 0x400, reserve) ||
 749             smp_scan_config(0xF0000, 0x10000, reserve))
 750                 return;
 751         /*
 752          * If it is an SMP machine we should know now, unless the
 753          * configuration is in an EISA/MCA bus machine with an
 754          * extended bios data area.
 755          *
 756          * there is a real-mode segmented pointer pointing to the
 757          * 4K EBDA area at 0x40E, calculate and scan it here.
 758          *
 759          * NOTE! There are Linux loaders that will corrupt the EBDA
 760          * area, and as such this kind of SMP config may be less
 761          * trustworthy, simply because the SMP table may have been
 762          * stomped on during early boot. These loaders are buggy and
 763          * should be fixed.
 764          *
 765          * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
 766          */
 767
 768         address = get_bios_ebda();
 769         if (address)
 770                 smp_scan_config(address, 0x400, reserve);
 771 }
 772
 773 #ifdef CONFIG_X86_IO_APIC
 774 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
 775
 776 static int  __init get_MP_intsrc_index(struct mpc_intsrc *m)
 777 {
 778         int i;
 779
 780         if (m->irqtype != mp_INT)
 781                 return 0;
 782
 783         if (m->irqflag != 0x0f)
 784                 return 0;
 785
 786         /* not legacy */
 787
 788         for (i = 0; i < mp_irq_entries; i++) {
 789                 if (mp_irqs[i].irqtype != mp_INT)
 790                         continue;
 791
 792                 if (mp_irqs[i].irqflag != 0x0f)
 793                         continue;
 794
 795                 if (mp_irqs[i].srcbus != m->srcbus)
 796                         continue;
 797                 if (mp_irqs[i].srcbusirq != m->srcbusirq)
 798                         continue;
 799                 if (irq_used[i]) {
 800                         /* already claimed */
 801                         return -2;
 802                 }
 803                 irq_used[i] = 1;
 804                 return i;
 805         }
 806
 807         /* not found */
 808         return -1;
 809 }
 810
 811 #define SPARE_SLOT_NUM 20
 812
 813 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
 814
 815 static void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
 816 {
 817         int i;
 818
 819         apic_printk(APIC_VERBOSE, "OLD ");
 820         print_MP_intsrc_info(m);
 821
 822         i = get_MP_intsrc_index(m);
 823         if (i > 0) {
 824                 assign_to_mpc_intsrc(&mp_irqs[i], m);
 825                 apic_printk(APIC_VERBOSE, "NEW ");
 826                 print_mp_irq_info(&mp_irqs[i]);
 827                 return;
 828         }
 829         if (!i) {
 830                 /* legacy, do nothing */
 831                 return;
 832         }
 833         if (*nr_m_spare < SPARE_SLOT_NUM) {
 834                 /*
 835                  * not found (-1), or duplicated (-2) are invalid entries,
 836                  * we need to use the slot later
 837                  */
 838                 m_spare[*nr_m_spare] = m;
 839                 *nr_m_spare += 1;
 840         }
 841 }
 842 #else /* CONFIG_X86_IO_APIC */
 843 static
 844 inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {}
 845 #endif /* CONFIG_X86_IO_APIC */
 846
 847 static int
 848 check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count)
 849 {
 850         int ret = 0;
 851
 852         if (!mpc_new_phys || count <= mpc_new_length) {
 853                 WARN(1, "update_mptable: No spare slots (length: %x)\n", count);
 854                 return -1;
 855         }
 856
 857         return ret;
 858 }
 859
 860 static int  __init replace_intsrc_all(struct mpc_table *mpc,
 861                                         unsigned long mpc_new_phys,
 862                                         unsigned long mpc_new_length)
 863 {
 864 #ifdef CONFIG_X86_IO_APIC
 865         int i;
 866 #endif
 867         int count = sizeof(*mpc);
 868         int nr_m_spare = 0;
 869         unsigned char *mpt = ((unsigned char *)mpc) + count;
 870
 871         printk(KERN_INFO "mpc_length %x\n", mpc->length);
 872         while (count < mpc->length) {
 873                 switch (*mpt) {
 874                 case MP_PROCESSOR:
 875                         skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
 876                         break;
 877                 case MP_BUS:
 878                         skip_entry(&mpt, &count, sizeof(struct mpc_bus));
 879                         break;
 880                 case MP_IOAPIC:
 881                         skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
 882                         break;
 883                 case MP_INTSRC:
 884                         check_irq_src((struct mpc_intsrc *)mpt, &nr_m_spare);
 885                         skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
 886                         break;
 887                 case MP_LINTSRC:
 888                         skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
 889                         break;
 890                 default:
 891                         /* wrong mptable */
 892                         smp_dump_mptable(mpc, mpt);
 893                         goto out;
 894                 }
 895         }
 896
 897 #ifdef CONFIG_X86_IO_APIC
 898         for (i = 0; i < mp_irq_entries; i++) {
 899                 if (irq_used[i])
 900                         continue;
 901
 902                 if (mp_irqs[i].irqtype != mp_INT)
 903                         continue;
 904
 905                 if (mp_irqs[i].irqflag != 0x0f)
 906                         continue;
 907
 908                 if (nr_m_spare > 0) {
 909                         apic_printk(APIC_VERBOSE, "*NEW* found\n");
 910                         nr_m_spare--;
 911                         assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
 912                         m_spare[nr_m_spare] = NULL;
 913                 } else {
 914                         struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
 915                         count += sizeof(struct mpc_intsrc);
 916                         if (check_slot(mpc_new_phys, mpc_new_length, count) < 0)
 917                                 goto out;
 918                         assign_to_mpc_intsrc(&mp_irqs[i], m);
 919                         mpc->length = count;
 920                         mpt += sizeof(struct mpc_intsrc);
 921                 }
 922                 print_mp_irq_info(&mp_irqs[i]);
 923         }
 924 #endif
 925 out:
 926         /* update checksum */
 927         mpc->checksum = 0;
 928         mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
 929
 930         return 0;
 931 }
 932
 933 int enable_update_mptable;
 934
 935 static int __init update_mptable_setup(char *str)
 936 {
 937         enable_update_mptable = 1;
 938 #ifdef CONFIG_PCI
 939         pci_routeirq = 1;
 940 #endif
 941         return 0;
 942 }
 943 early_param("update_mptable", update_mptable_setup);
 944
 945 static unsigned long __initdata mpc_new_phys;
 946 static unsigned long mpc_new_length __initdata = 4096;
 947
 948 /* alloc_mptable or alloc_mptable=4k */
 949 static int __initdata alloc_mptable;
 950 static int __init parse_alloc_mptable_opt(char *p)
 951 {
 952         enable_update_mptable = 1;
 953 #ifdef CONFIG_PCI
 954         pci_routeirq = 1;
 955 #endif
 956         alloc_mptable = 1;
 957         if (!p)
 958                 return 0;
 959         mpc_new_length = memparse(p, &p);
 960         return 0;
 961 }
 962 early_param("alloc_mptable", parse_alloc_mptable_opt);
 963
 964 void __init early_reserve_e820_mpc_new(void)
 965 {
 966         if (enable_update_mptable && alloc_mptable) {
 967                 u64 startt = 0;
 968 #ifdef CONFIG_X86_TRAMPOLINE
 969                 startt = TRAMPOLINE_BASE;
 970 #endif
 971                 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
 972         }
 973 }
 974
 975 static int __init update_mp_table(void)
 976 {
 977         char str[16];
 978         char oem[10];
 979         struct mpf_intel *mpf;
 980         struct mpc_table *mpc, *mpc_new;
 981
 982         if (!enable_update_mptable)
 983                 return 0;
 984
 985         mpf = mpf_found;
 986         if (!mpf)
 987                 return 0;
 988
 989         /*
 990          * Now see if we need to go further.
 991          */
 992         if (mpf->feature1 != 0)
 993                 return 0;
 994
 995         if (!mpf->physptr)
 996                 return 0;
 997
 998         mpc = phys_to_virt(mpf->physptr);
 999
1000         if (!smp_check_mpc(mpc, oem, str))
1001                 return 0;
1002
1003         printk(KERN_INFO "mpf: %llx\n", (u64)virt_to_phys(mpf));
1004         printk(KERN_INFO "physptr: %x\n", mpf->physptr);
1005
1006         if (mpc_new_phys && mpc->length > mpc_new_length) {
1007                 mpc_new_phys = 0;
1008                 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
1009                          mpc_new_length);
1010         }
1011
1012         if (!mpc_new_phys) {
1013                 unsigned char old, new;
1014                 /* check if we can change the postion */
1015                 mpc->checksum = 0;
1016                 old = mpf_checksum((unsigned char *)mpc, mpc->length);
1017                 mpc->checksum = 0xff;
1018                 new = mpf_checksum((unsigned char *)mpc, mpc->length);
1019                 if (old == new) {
1020                         printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
1021                         return 0;
1022                 }
1023                 printk(KERN_INFO "use in-positon replacing\n");
1024         } else {
1025                 mpf->physptr = mpc_new_phys;
1026                 mpc_new = phys_to_virt(mpc_new_phys);
1027                 memcpy(mpc_new, mpc, mpc->length);
1028                 mpc = mpc_new;
1029                 /* check if we can modify that */
1030                 if (mpc_new_phys - mpf->physptr) {
1031                         struct mpf_intel *mpf_new;
1032                         /* steal 16 bytes from [0, 1k) */
1033                         printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
1034                         mpf_new = phys_to_virt(0x400 - 16);
1035                         memcpy(mpf_new, mpf, 16);
1036                         mpf = mpf_new;
1037                         mpf->physptr = mpc_new_phys;
1038                 }
1039                 mpf->checksum = 0;
1040                 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
1041                 printk(KERN_INFO "physptr new: %x\n", mpf->physptr);
1042         }
1043
1044         /*
1045          * only replace the one with mp_INT and
1046          *       MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1047          * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1048          * may need pci=routeirq for all coverage
1049          */
1050         replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1051
1052         return 0;
1053 }
1054
1055 late_initcall(update_mp_table);