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@redhat.com>
   6  *      (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
   7  *      (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
   8  */
   9
  10 #include <linux/mm.h>
  11 #include <linux/init.h>
  12 #include <linux/delay.h>
  13 #include <linux/bootmem.h>
  14 #include <linux/kernel_stat.h>
  15 #include <linux/mc146818rtc.h>
  16 #include <linux/bitops.h>
  17 #include <linux/acpi.h>
  18 #include <linux/module.h>
  19
  20 #include <asm/smp.h>
  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/acpi.h>
  27 #include <asm/bios_ebda.h>
  28
  29 #include <mach_apic.h>
  30 #ifdef CONFIG_X86_32
  31 #include <mach_apicdef.h>
  32 #include <mach_mpparse.h>
  33 #endif
  34
  35 /* Have we found an MP table */
  36 int smp_found_config;
  37
  38 /*
  39  * Various Linux-internal data structures created from the
  40  * MP-table.
  41  */
  42 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
  43 int mp_bus_id_to_type[MAX_MP_BUSSES];
  44 #endif
  45
  46 DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
  47 int mp_bus_id_to_pci_bus[MAX_MP_BUSSES] = {[0 ... MAX_MP_BUSSES - 1] = -1 };
  48
  49 static int mp_current_pci_id;
  50
  51 int pic_mode;
  52
  53 /*
  54  * Intel MP BIOS table parsing routines:
  55  */
  56
  57 /*
  58  * Checksum an MP configuration block.
  59  */
  60
  61 static int __init mpf_checksum(unsigned char *mp, int len)
  62 {
  63         int sum = 0;
  64
  65         while (len--)
  66                 sum += *mp++;
  67
  68         return sum & 0xFF;
  69 }
  70
  71 #ifdef CONFIG_X86_NUMAQ
  72 /*
  73  * Have to match translation table entries to main table entries by counter
  74  * hence the mpc_record variable .... can't see a less disgusting way of
  75  * doing this ....
  76  */
  77
  78 static int mpc_record;
  79 static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY]
  80     __cpuinitdata;
  81 #endif
  82
  83 static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
  84 {
  85         int apicid;
  86         char *bootup_cpu = "";
  87
  88         if (!(m->mpc_cpuflag & CPU_ENABLED)) {
  89                 disabled_cpus++;
  90                 return;
  91         }
  92 #ifdef CONFIG_X86_NUMAQ
  93         apicid = mpc_apic_id(m, translation_table[mpc_record]);
  94 #else
  95         apicid = m->mpc_apicid;
  96 #endif
  97         if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
  98                 bootup_cpu = " (Bootup-CPU)";
  99                 boot_cpu_physical_apicid = m->mpc_apicid;
 100         }
 101
 102         printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
 103         generic_processor_info(apicid, m->mpc_apicver);
 104 }
 105
 106 static void __init MP_bus_info(struct mpc_config_bus *m)
 107 {
 108         char str[7];
 109
 110         memcpy(str, m->mpc_bustype, 6);
 111         str[6] = 0;
 112
 113 #ifdef CONFIG_X86_NUMAQ
 114         mpc_oem_bus_info(m, str, translation_table[mpc_record]);
 115 #else
 116         printk(KERN_INFO "Bus #%d is %s\n", m->mpc_busid, str);
 117 #endif
 118
 119 #if MAX_MP_BUSSES < 256
 120         if (m->mpc_busid >= MAX_MP_BUSSES) {
 121                 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
 122                        " is too large, max. supported is %d\n",
 123                        m->mpc_busid, str, MAX_MP_BUSSES - 1);
 124                 return;
 125         }
 126 #endif
 127
 128         if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
 129                  set_bit(m->mpc_busid, mp_bus_not_pci);
 130 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
 131                 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
 132 #endif
 133         } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
 134 #ifdef CONFIG_X86_NUMAQ
 135                 mpc_oem_pci_bus(m, translation_table[mpc_record]);
 136 #endif
 137                 clear_bit(m->mpc_busid, mp_bus_not_pci);
 138                 mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
 139                 mp_current_pci_id++;
 140 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
 141                 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
 142         } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
 143                 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
 144         } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
 145                 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
 146 #endif
 147         } else
 148                 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
 149 }
 150
 151 #ifdef CONFIG_X86_IO_APIC
 152
 153 static int bad_ioapic(unsigned long address)
 154 {
 155         if (nr_ioapics >= MAX_IO_APICS) {
 156                 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
 157                        "(found %d)\n", MAX_IO_APICS, nr_ioapics);
 158                 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
 159         }
 160         if (!address) {
 161                 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
 162                        " found in table, skipping!\n");
 163                 return 1;
 164         }
 165         return 0;
 166 }
 167
 168 static void __init MP_ioapic_info(struct mpc_config_ioapic *m)
 169 {
 170         if (!(m->mpc_flags & MPC_APIC_USABLE))
 171                 return;
 172
 173         printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
 174                m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
 175
 176         if (bad_ioapic(m->mpc_apicaddr))
 177                 return;
 178
 179         mp_ioapics[nr_ioapics].mp_apicaddr = m->mpc_apicaddr;
 180         mp_ioapics[nr_ioapics].mp_apicid = m->mpc_apicid;
 181         mp_ioapics[nr_ioapics].mp_type = m->mpc_type;
 182         mp_ioapics[nr_ioapics].mp_apicver = m->mpc_apicver;
 183         mp_ioapics[nr_ioapics].mp_flags = m->mpc_flags;
 184         nr_ioapics++;
 185 }
 186
 187 static void __init MP_intsrc_info(struct mpc_config_intsrc *m)
 188 {
 189         printk(KERN_INFO "Int: type %d, pol %d, trig %d, bus %02x,"
 190                 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
 191                 m->mpc_irqtype, m->mpc_irqflag & 3,
 192                 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
 193                 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
 194         mp_irqs[mp_irq_entries].mp_dstapic = m->mpc_dstapic;
 195         mp_irqs[mp_irq_entries].mp_type = m->mpc_type;
 196         mp_irqs[mp_irq_entries].mp_irqtype = m->mpc_irqtype;
 197         mp_irqs[mp_irq_entries].mp_irqflag = m->mpc_irqflag;
 198         mp_irqs[mp_irq_entries].mp_srcbus = m->mpc_srcbus;
 199         mp_irqs[mp_irq_entries].mp_srcbusirq = m->mpc_srcbusirq;
 200         mp_irqs[mp_irq_entries].mp_dstirq = m->mpc_dstirq;
 201         if (++mp_irq_entries == MAX_IRQ_SOURCES)
 202                 panic("Max # of irq sources exceeded!!\n");
 203 }
 204
 205 #endif
 206
 207 static void __init MP_lintsrc_info(struct mpc_config_lintsrc *m)
 208 {
 209         printk(KERN_INFO "Lint: type %d, pol %d, trig %d, bus %02x,"
 210                 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
 211                 m->mpc_irqtype, m->mpc_irqflag & 3,
 212                 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbusid,
 213                 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
 214 }
 215
 216 #ifdef CONFIG_X86_NUMAQ
 217 static void __init MP_translation_info(struct mpc_config_translation *m)
 218 {
 219         printk(KERN_INFO
 220                "Translation: record %d, type %d, quad %d, global %d, local %d\n",
 221                mpc_record, m->trans_type, m->trans_quad, m->trans_global,
 222                m->trans_local);
 223
 224         if (mpc_record >= MAX_MPC_ENTRY)
 225                 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
 226         else
 227                 translation_table[mpc_record] = m;      /* stash this for later */
 228         if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
 229                 node_set_online(m->trans_quad);
 230 }
 231
 232 /*
 233  * Read/parse the MPC oem tables
 234  */
 235
 236 static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable,
 237                                     unsigned short oemsize)
 238 {
 239         int count = sizeof(*oemtable);  /* the header size */
 240         unsigned char *oemptr = ((unsigned char *)oemtable) + count;
 241
 242         mpc_record = 0;
 243         printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n",
 244                oemtable);
 245         if (memcmp(oemtable->oem_signature, MPC_OEM_SIGNATURE, 4)) {
 246                 printk(KERN_WARNING
 247                        "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
 248                        oemtable->oem_signature[0], oemtable->oem_signature[1],
 249                        oemtable->oem_signature[2], oemtable->oem_signature[3]);
 250                 return;
 251         }
 252         if (mpf_checksum((unsigned char *)oemtable, oemtable->oem_length)) {
 253                 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
 254                 return;
 255         }
 256         while (count < oemtable->oem_length) {
 257                 switch (*oemptr) {
 258                 case MP_TRANSLATION:
 259                         {
 260                                 struct mpc_config_translation *m =
 261                                     (struct mpc_config_translation *)oemptr;
 262                                 MP_translation_info(m);
 263                                 oemptr += sizeof(*m);
 264                                 count += sizeof(*m);
 265                                 ++mpc_record;
 266                                 break;
 267                         }
 268                 default:
 269                         {
 270                                 printk(KERN_WARNING
 271                                        "Unrecognised OEM table entry type! - %d\n",
 272                                        (int)*oemptr);
 273                                 return;
 274                         }
 275                 }
 276         }
 277 }
 278
 279 static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
 280                                  char *productid)
 281 {
 282         if (strncmp(oem, "IBM NUMA", 8))
 283                 printk("Warning!  May not be a NUMA-Q system!\n");
 284         if (mpc->mpc_oemptr)
 285                 smp_read_mpc_oem((struct mp_config_oemtable *)mpc->mpc_oemptr,
 286                                  mpc->mpc_oemsize);
 287 }
 288 #endif /* CONFIG_X86_NUMAQ */
 289
 290 /*
 291  * Read/parse the MPC
 292  */
 293
 294 static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
 295 {
 296         char str[16];
 297         char oem[10];
 298         int count = sizeof(*mpc);
 299         unsigned char *mpt = ((unsigned char *)mpc) + count;
 300
 301         if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
 302                 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
 303                        mpc->mpc_signature[0], mpc->mpc_signature[1],
 304                        mpc->mpc_signature[2], mpc->mpc_signature[3]);
 305                 return 0;
 306         }
 307         if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
 308                 printk(KERN_ERR "MPTABLE: checksum error!\n");
 309                 return 0;
 310         }
 311         if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
 312                 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
 313                        mpc->mpc_spec);
 314                 return 0;
 315         }
 316         if (!mpc->mpc_lapic) {
 317                 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
 318                 return 0;
 319         }
 320         memcpy(oem, mpc->mpc_oem, 8);
 321         oem[8] = 0;
 322         printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
 323
 324         memcpy(str, mpc->mpc_productid, 12);
 325         str[12] = 0;
 326
 327 #ifdef CONFIG_X86_32
 328         mps_oem_check(mpc, oem, str);
 329 #endif
 330         printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
 331
 332         printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
 333
 334         /* save the local APIC address, it might be non-default */
 335         if (!acpi_lapic)
 336                 mp_lapic_addr = mpc->mpc_lapic;
 337
 338         if (early)
 339                 return 1;
 340
 341         /*
 342          *      Now process the configuration blocks.
 343          */
 344 #ifdef CONFIG_X86_NUMAQ
 345         mpc_record = 0;
 346 #endif
 347         while (count < mpc->mpc_length) {
 348                 switch (*mpt) {
 349                 case MP_PROCESSOR:
 350                         {
 351                                 struct mpc_config_processor *m =
 352                                     (struct mpc_config_processor *)mpt;
 353                                 /* ACPI may have already provided this data */
 354                                 if (!acpi_lapic)
 355                                         MP_processor_info(m);
 356                                 mpt += sizeof(*m);
 357                                 count += sizeof(*m);
 358                                 break;
 359                         }
 360                 case MP_BUS:
 361                         {
 362                                 struct mpc_config_bus *m =
 363                                     (struct mpc_config_bus *)mpt;
 364                                 MP_bus_info(m);
 365                                 mpt += sizeof(*m);
 366                                 count += sizeof(*m);
 367                                 break;
 368                         }
 369                 case MP_IOAPIC:
 370                         {
 371 #ifdef CONFIG_X86_IO_APIC
 372                                 struct mpc_config_ioapic *m =
 373                                     (struct mpc_config_ioapic *)mpt;
 374                                 MP_ioapic_info(m);
 375 #endif
 376                                 mpt += sizeof(struct mpc_config_ioapic);
 377                                 count += sizeof(struct mpc_config_ioapic);
 378                                 break;
 379                         }
 380                 case MP_INTSRC:
 381                         {
 382 #ifdef CONFIG_X86_IO_APIC
 383                                 struct mpc_config_intsrc *m =
 384                                     (struct mpc_config_intsrc *)mpt;
 385
 386                                 MP_intsrc_info(m);
 387 #endif
 388                                 mpt += sizeof(struct mpc_config_intsrc);
 389                                 count += sizeof(struct mpc_config_intsrc);
 390                                 break;
 391                         }
 392                 case MP_LINTSRC:
 393                         {
 394                                 struct mpc_config_lintsrc *m =
 395                                     (struct mpc_config_lintsrc *)mpt;
 396                                 MP_lintsrc_info(m);
 397                                 mpt += sizeof(*m);
 398                                 count += sizeof(*m);
 399                                 break;
 400                         }
 401                 default:
 402                         /* wrong mptable */
 403                         printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
 404                         printk(KERN_ERR "type %x\n", *mpt);
 405                         print_hex_dump(KERN_ERR, "  ", DUMP_PREFIX_ADDRESS, 16,
 406                                         1, mpc, mpc->mpc_length, 1);
 407                         count = mpc->mpc_length;
 408                         break;
 409                 }
 410 #ifdef CONFIG_X86_NUMAQ
 411                 ++mpc_record;
 412 #endif
 413         }
 414         setup_apic_routing();
 415         if (!num_processors)
 416                 printk(KERN_ERR "MPTABLE: no processors registered!\n");
 417         return num_processors;
 418 }
 419
 420 #ifdef CONFIG_X86_IO_APIC
 421
 422 static int __init ELCR_trigger(unsigned int irq)
 423 {
 424         unsigned int port;
 425
 426         port = 0x4d0 + (irq >> 3);
 427         return (inb(port) >> (irq & 7)) & 1;
 428 }
 429
 430 static void __init construct_default_ioirq_mptable(int mpc_default_type)
 431 {
 432         struct mpc_config_intsrc intsrc;
 433         int i;
 434         int ELCR_fallback = 0;
 435
 436         intsrc.mpc_type = MP_INTSRC;
 437         intsrc.mpc_irqflag = 0; /* conforming */
 438         intsrc.mpc_srcbus = 0;
 439         intsrc.mpc_dstapic = mp_ioapics[0].mp_apicid;
 440
 441         intsrc.mpc_irqtype = mp_INT;
 442
 443         /*
 444          *  If true, we have an ISA/PCI system with no IRQ entries
 445          *  in the MP table. To prevent the PCI interrupts from being set up
 446          *  incorrectly, we try to use the ELCR. The sanity check to see if
 447          *  there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
 448          *  never be level sensitive, so we simply see if the ELCR agrees.
 449          *  If it does, we assume it's valid.
 450          */
 451         if (mpc_default_type == 5) {
 452                 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
 453                        "falling back to ELCR\n");
 454
 455                 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
 456                     ELCR_trigger(13))
 457                         printk(KERN_ERR "ELCR contains invalid data... "
 458                                "not using ELCR\n");
 459                 else {
 460                         printk(KERN_INFO
 461                                "Using ELCR to identify PCI interrupts\n");
 462                         ELCR_fallback = 1;
 463                 }
 464         }
 465
 466         for (i = 0; i < 16; i++) {
 467                 switch (mpc_default_type) {
 468                 case 2:
 469                         if (i == 0 || i == 13)
 470                                 continue;       /* IRQ0 & IRQ13 not connected */
 471                         /* fall through */
 472                 default:
 473                         if (i == 2)
 474                                 continue;       /* IRQ2 is never connected */
 475                 }
 476
 477                 if (ELCR_fallback) {
 478                         /*
 479                          *  If the ELCR indicates a level-sensitive interrupt, we
 480                          *  copy that information over to the MP table in the
 481                          *  irqflag field (level sensitive, active high polarity).
 482                          */
 483                         if (ELCR_trigger(i))
 484                                 intsrc.mpc_irqflag = 13;
 485                         else
 486                                 intsrc.mpc_irqflag = 0;
 487                 }
 488
 489                 intsrc.mpc_srcbusirq = i;
 490                 intsrc.mpc_dstirq = i ? i : 2;  /* IRQ0 to INTIN2 */
 491                 MP_intsrc_info(&intsrc);
 492         }
 493
 494         intsrc.mpc_irqtype = mp_ExtINT;
 495         intsrc.mpc_srcbusirq = 0;
 496         intsrc.mpc_dstirq = 0;  /* 8259A to INTIN0 */
 497         MP_intsrc_info(&intsrc);
 498 }
 499
 500 #endif
 501
 502 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
 503 {
 504         struct mpc_config_processor processor;
 505         struct mpc_config_bus bus;
 506 #ifdef CONFIG_X86_IO_APIC
 507         struct mpc_config_ioapic ioapic;
 508 #endif
 509         struct mpc_config_lintsrc lintsrc;
 510         int linttypes[2] = { mp_ExtINT, mp_NMI };
 511         int i;
 512
 513         /*
 514          * local APIC has default address
 515          */
 516         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 517
 518         /*
 519          * 2 CPUs, numbered 0 & 1.
 520          */
 521         processor.mpc_type = MP_PROCESSOR;
 522         /* Either an integrated APIC or a discrete 82489DX. */
 523         processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 524         processor.mpc_cpuflag = CPU_ENABLED;
 525         processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
 526             (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
 527         processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
 528         processor.mpc_reserved[0] = 0;
 529         processor.mpc_reserved[1] = 0;
 530         for (i = 0; i < 2; i++) {
 531                 processor.mpc_apicid = i;
 532                 MP_processor_info(&processor);
 533         }
 534
 535         bus.mpc_type = MP_BUS;
 536         bus.mpc_busid = 0;
 537         switch (mpc_default_type) {
 538         default:
 539                 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
 540                        mpc_default_type);
 541                 /* fall through */
 542         case 1:
 543         case 5:
 544                 memcpy(bus.mpc_bustype, "ISA   ", 6);
 545                 break;
 546         case 2:
 547         case 6:
 548         case 3:
 549                 memcpy(bus.mpc_bustype, "EISA  ", 6);
 550                 break;
 551         case 4:
 552         case 7:
 553                 memcpy(bus.mpc_bustype, "MCA   ", 6);
 554         }
 555         MP_bus_info(&bus);
 556         if (mpc_default_type > 4) {
 557                 bus.mpc_busid = 1;
 558                 memcpy(bus.mpc_bustype, "PCI   ", 6);
 559                 MP_bus_info(&bus);
 560         }
 561
 562 #ifdef CONFIG_X86_IO_APIC
 563         ioapic.mpc_type = MP_IOAPIC;
 564         ioapic.mpc_apicid = 2;
 565         ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 566         ioapic.mpc_flags = MPC_APIC_USABLE;
 567         ioapic.mpc_apicaddr = 0xFEC00000;
 568         MP_ioapic_info(&ioapic);
 569
 570         /*
 571          * We set up most of the low 16 IO-APIC pins according to MPS rules.
 572          */
 573         construct_default_ioirq_mptable(mpc_default_type);
 574 #endif
 575         lintsrc.mpc_type = MP_LINTSRC;
 576         lintsrc.mpc_irqflag = 0;        /* conforming */
 577         lintsrc.mpc_srcbusid = 0;
 578         lintsrc.mpc_srcbusirq = 0;
 579         lintsrc.mpc_destapic = MP_APIC_ALL;
 580         for (i = 0; i < 2; i++) {
 581                 lintsrc.mpc_irqtype = linttypes[i];
 582                 lintsrc.mpc_destapiclint = i;
 583                 MP_lintsrc_info(&lintsrc);
 584         }
 585 }
 586
 587 static struct intel_mp_floating *mpf_found;
 588
 589 /*
 590  * Scan the memory blocks for an SMP configuration block.
 591  */
 592 static void __init __get_smp_config(unsigned early)
 593 {
 594         struct intel_mp_floating *mpf = mpf_found;
 595
 596         if (acpi_lapic && early)
 597                 return;
 598         /*
 599          * ACPI supports both logical (e.g. Hyper-Threading) and physical
 600          * processors, where MPS only supports physical.
 601          */
 602         if (acpi_lapic && acpi_ioapic) {
 603                 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
 604                        "information\n");
 605                 return;
 606         } else if (acpi_lapic)
 607                 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
 608                        "configuration information\n");
 609
 610         printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
 611                mpf->mpf_specification);
 612 #ifdef CONFIG_X86_32
 613         if (mpf->mpf_feature2 & (1 << 7)) {
 614                 printk(KERN_INFO "    IMCR and PIC compatibility mode.\n");
 615                 pic_mode = 1;
 616         } else {
 617                 printk(KERN_INFO "    Virtual Wire compatibility mode.\n");
 618                 pic_mode = 0;
 619         }
 620 #endif
 621         /*
 622          * Now see if we need to read further.
 623          */
 624         if (mpf->mpf_feature1 != 0) {
 625                 if (early) {
 626                         /*
 627                          * local APIC has default address
 628                          */
 629                         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 630                         return;
 631                 }
 632
 633                 printk(KERN_INFO "Default MP configuration #%d\n",
 634                        mpf->mpf_feature1);
 635                 construct_default_ISA_mptable(mpf->mpf_feature1);
 636
 637         } else if (mpf->mpf_physptr) {
 638
 639                 /*
 640                  * Read the physical hardware table.  Anything here will
 641                  * override the defaults.
 642                  */
 643                 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
 644                         smp_found_config = 0;
 645                         printk(KERN_ERR
 646                                "BIOS bug, MP table errors detected!...\n");
 647                         printk(KERN_ERR "... disabling SMP support. "
 648                                "(tell your hw vendor)\n");
 649                         return;
 650                 }
 651
 652                 if (early)
 653                         return;
 654 #ifdef CONFIG_X86_IO_APIC
 655                 /*
 656                  * If there are no explicit MP IRQ entries, then we are
 657                  * broken.  We set up most of the low 16 IO-APIC pins to
 658                  * ISA defaults and hope it will work.
 659                  */
 660                 if (!mp_irq_entries) {
 661                         struct mpc_config_bus bus;
 662
 663                         printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
 664                                "using default mptable. "
 665                                "(tell your hw vendor)\n");
 666
 667                         bus.mpc_type = MP_BUS;
 668                         bus.mpc_busid = 0;
 669                         memcpy(bus.mpc_bustype, "ISA   ", 6);
 670                         MP_bus_info(&bus);
 671
 672                         construct_default_ioirq_mptable(0);
 673                 }
 674 #endif
 675         } else
 676                 BUG();
 677
 678         if (!early)
 679                 printk(KERN_INFO "Processors: %d\n", num_processors);
 680         /*
 681          * Only use the first configuration found.
 682          */
 683 }
 684
 685 void __init early_get_smp_config(void)
 686 {
 687         __get_smp_config(1);
 688 }
 689
 690 void __init get_smp_config(void)
 691 {
 692         __get_smp_config(0);
 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 intel_mp_floating *mpf;
 700
 701         printk(KERN_DEBUG "Scan SMP from %p for %ld bytes.\n", bp, length);
 702         BUILD_BUG_ON(sizeof(*mpf) != 16);
 703
 704         while (length > 0) {
 705                 mpf = (struct intel_mp_floating *)bp;
 706                 if ((*bp == SMP_MAGIC_IDENT) &&
 707                     (mpf->mpf_length == 1) &&
 708                     !mpf_checksum((unsigned char *)bp, 16) &&
 709                     ((mpf->mpf_specification == 1)
 710                      || (mpf->mpf_specification == 4))) {
 711
 712                         smp_found_config = 1;
 713                         mpf_found = mpf;
 714 #ifdef CONFIG_X86_32
 715                         printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
 716                                mpf, virt_to_phys(mpf));
 717                         reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE,
 718                                         BOOTMEM_DEFAULT);
 719                         if (mpf->mpf_physptr) {
 720                                 /*
 721                                  * We cannot access to MPC table to compute
 722                                  * table size yet, as only few megabytes from
 723                                  * the bottom is mapped now.
 724                                  * PC-9800's MPC table places on the very last
 725                                  * of physical memory; so that simply reserving
 726                                  * PAGE_SIZE from mpg->mpf_physptr yields BUG()
 727                                  * in reserve_bootmem.
 728                                  */
 729                                 unsigned long size = PAGE_SIZE;
 730                                 unsigned long end = max_low_pfn * PAGE_SIZE;
 731                                 if (mpf->mpf_physptr + size > end)
 732                                         size = end - mpf->mpf_physptr;
 733                                 reserve_bootmem(mpf->mpf_physptr, size,
 734                                                 BOOTMEM_DEFAULT);
 735                         }
 736
 737 #else
 738                         if (!reserve)
 739                                 return 1;
 740
 741                         reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
 742                         if (mpf->mpf_physptr)
 743                                 reserve_bootmem_generic(mpf->mpf_physptr,
 744                                                         PAGE_SIZE);
 745 #endif
 746                 return 1;
 747                 }
 748                 bp += 4;
 749                 length -= 16;
 750         }
 751         return 0;
 752 }
 753
 754 static void __init __find_smp_config(unsigned reserve)
 755 {
 756         unsigned int address;
 757
 758         /*
 759          * FIXME: Linux assumes you have 640K of base ram..
 760          * this continues the error...
 761          *
 762          * 1) Scan the bottom 1K for a signature
 763          * 2) Scan the top 1K of base RAM
 764          * 3) Scan the 64K of bios
 765          */
 766         if (smp_scan_config(0x0, 0x400, reserve) ||
 767             smp_scan_config(639 * 0x400, 0x400, reserve) ||
 768             smp_scan_config(0xF0000, 0x10000, reserve))
 769                 return;
 770         /*
 771          * If it is an SMP machine we should know now, unless the
 772          * configuration is in an EISA/MCA bus machine with an
 773          * extended bios data area.
 774          *
 775          * there is a real-mode segmented pointer pointing to the
 776          * 4K EBDA area at 0x40E, calculate and scan it here.
 777          *
 778          * NOTE! There are Linux loaders that will corrupt the EBDA
 779          * area, and as such this kind of SMP config may be less
 780          * trustworthy, simply because the SMP table may have been
 781          * stomped on during early boot. These loaders are buggy and
 782          * should be fixed.
 783          *
 784          * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
 785          */
 786
 787         address = get_bios_ebda();
 788         if (address)
 789                 smp_scan_config(address, 0x400, reserve);
 790 }
 791
 792 void __init early_find_smp_config(void)
 793 {
 794         __find_smp_config(0);
 795 }
 796
 797 void __init find_smp_config(void)
 798 {
 799         __find_smp_config(1);
 800 }