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 /*
  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 #ifdef CONFIG_X86_NUMAQ
  50 /*
  51  * Have to match translation table entries to main table entries by counter
  52  * hence the mpc_record variable .... can't see a less disgusting way of
  53  * doing this ....
  54  */
  55
  56 static int mpc_record;
  57 static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY]
  58     __cpuinitdata;
  59 #endif
  60
  61 static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
  62 {
  63         int apicid;
  64         char *bootup_cpu = "";
  65
  66         if (!(m->mpc_cpuflag & CPU_ENABLED)) {
  67                 disabled_cpus++;
  68                 return;
  69         }
  70 #ifdef CONFIG_X86_NUMAQ
  71         apicid = mpc_apic_id(m, translation_table[mpc_record]);
  72 #else
  73         apicid = m->mpc_apicid;
  74 #endif
  75         if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
  76                 bootup_cpu = " (Bootup-CPU)";
  77                 boot_cpu_physical_apicid = m->mpc_apicid;
  78         }
  79
  80         printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
  81         generic_processor_info(apicid, m->mpc_apicver);
  82 }
  83
  84 #ifdef CONFIG_X86_IO_APIC
  85 static void __init MP_bus_info(struct mpc_config_bus *m)
  86 {
  87         char str[7];
  88         memcpy(str, m->mpc_bustype, 6);
  89         str[6] = 0;
  90
  91 #ifdef CONFIG_X86_NUMAQ
  92         mpc_oem_bus_info(m, str, translation_table[mpc_record]);
  93 #else
  94         printk(KERN_INFO "Bus #%d is %s\n", m->mpc_busid, str);
  95 #endif
  96
  97 #if MAX_MP_BUSSES < 256
  98         if (m->mpc_busid >= MAX_MP_BUSSES) {
  99                 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
 100                        " is too large, max. supported is %d\n",
 101                        m->mpc_busid, str, MAX_MP_BUSSES - 1);
 102                 return;
 103         }
 104 #endif
 105
 106         if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
 107                  set_bit(m->mpc_busid, mp_bus_not_pci);
 108 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
 109                 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
 110 #endif
 111         } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
 112 #ifdef CONFIG_X86_NUMAQ
 113                 mpc_oem_pci_bus(m, translation_table[mpc_record]);
 114 #endif
 115                 clear_bit(m->mpc_busid, mp_bus_not_pci);
 116 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
 117                 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
 118         } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
 119                 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
 120         } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
 121                 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
 122 #endif
 123         } else
 124                 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
 125 }
 126 #endif
 127
 128 #ifdef CONFIG_X86_IO_APIC
 129
 130 static int bad_ioapic(unsigned long address)
 131 {
 132         if (nr_ioapics >= MAX_IO_APICS) {
 133                 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
 134                        "(found %d)\n", MAX_IO_APICS, nr_ioapics);
 135                 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
 136         }
 137         if (!address) {
 138                 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
 139                        " found in table, skipping!\n");
 140                 return 1;
 141         }
 142         return 0;
 143 }
 144
 145 static void __init MP_ioapic_info(struct mpc_config_ioapic *m)
 146 {
 147         if (!(m->mpc_flags & MPC_APIC_USABLE))
 148                 return;
 149
 150         printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
 151                m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
 152
 153         if (bad_ioapic(m->mpc_apicaddr))
 154                 return;
 155
 156         mp_ioapics[nr_ioapics].mp_apicaddr = m->mpc_apicaddr;
 157         mp_ioapics[nr_ioapics].mp_apicid = m->mpc_apicid;
 158         mp_ioapics[nr_ioapics].mp_type = m->mpc_type;
 159         mp_ioapics[nr_ioapics].mp_apicver = m->mpc_apicver;
 160         mp_ioapics[nr_ioapics].mp_flags = m->mpc_flags;
 161         nr_ioapics++;
 162 }
 163
 164 static void __init MP_intsrc_info(struct mpc_config_intsrc *m)
 165 {
 166         printk(KERN_INFO "Int: type %d, pol %d, trig %d, bus %02x,"
 167                 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
 168                 m->mpc_irqtype, m->mpc_irqflag & 3,
 169                 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
 170                 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
 171         mp_irqs[mp_irq_entries].mp_dstapic = m->mpc_dstapic;
 172         mp_irqs[mp_irq_entries].mp_type = m->mpc_type;
 173         mp_irqs[mp_irq_entries].mp_irqtype = m->mpc_irqtype;
 174         mp_irqs[mp_irq_entries].mp_irqflag = m->mpc_irqflag;
 175         mp_irqs[mp_irq_entries].mp_srcbus = m->mpc_srcbus;
 176         mp_irqs[mp_irq_entries].mp_srcbusirq = m->mpc_srcbusirq;
 177         mp_irqs[mp_irq_entries].mp_dstirq = m->mpc_dstirq;
 178         if (++mp_irq_entries == MAX_IRQ_SOURCES)
 179                 panic("Max # of irq sources exceeded!!\n");
 180 }
 181
 182 #endif
 183
 184 static void __init MP_lintsrc_info(struct mpc_config_lintsrc *m)
 185 {
 186         printk(KERN_INFO "Lint: type %d, pol %d, trig %d, bus %02x,"
 187                 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
 188                 m->mpc_irqtype, m->mpc_irqflag & 3,
 189                 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbusid,
 190                 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
 191 }
 192
 193 #ifdef CONFIG_X86_NUMAQ
 194 static void __init MP_translation_info(struct mpc_config_translation *m)
 195 {
 196         printk(KERN_INFO
 197                "Translation: record %d, type %d, quad %d, global %d, local %d\n",
 198                mpc_record, m->trans_type, m->trans_quad, m->trans_global,
 199                m->trans_local);
 200
 201         if (mpc_record >= MAX_MPC_ENTRY)
 202                 printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
 203         else
 204                 translation_table[mpc_record] = m;      /* stash this for later */
 205         if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
 206                 node_set_online(m->trans_quad);
 207 }
 208
 209 /*
 210  * Read/parse the MPC oem tables
 211  */
 212
 213 static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable,
 214                                     unsigned short oemsize)
 215 {
 216         int count = sizeof(*oemtable);  /* the header size */
 217         unsigned char *oemptr = ((unsigned char *)oemtable) + count;
 218
 219         mpc_record = 0;
 220         printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n",
 221                oemtable);
 222         if (memcmp(oemtable->oem_signature, MPC_OEM_SIGNATURE, 4)) {
 223                 printk(KERN_WARNING
 224                        "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
 225                        oemtable->oem_signature[0], oemtable->oem_signature[1],
 226                        oemtable->oem_signature[2], oemtable->oem_signature[3]);
 227                 return;
 228         }
 229         if (mpf_checksum((unsigned char *)oemtable, oemtable->oem_length)) {
 230                 printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
 231                 return;
 232         }
 233         while (count < oemtable->oem_length) {
 234                 switch (*oemptr) {
 235                 case MP_TRANSLATION:
 236                         {
 237                                 struct mpc_config_translation *m =
 238                                     (struct mpc_config_translation *)oemptr;
 239                                 MP_translation_info(m);
 240                                 oemptr += sizeof(*m);
 241                                 count += sizeof(*m);
 242                                 ++mpc_record;
 243                                 break;
 244                         }
 245                 default:
 246                         {
 247                                 printk(KERN_WARNING
 248                                        "Unrecognised OEM table entry type! - %d\n",
 249                                        (int)*oemptr);
 250                                 return;
 251                         }
 252                 }
 253         }
 254 }
 255
 256 static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
 257                                  char *productid)
 258 {
 259         if (strncmp(oem, "IBM NUMA", 8))
 260                 printk("Warning!  May not be a NUMA-Q system!\n");
 261         if (mpc->mpc_oemptr)
 262                 smp_read_mpc_oem((struct mp_config_oemtable *)mpc->mpc_oemptr,
 263                                  mpc->mpc_oemsize);
 264 }
 265 #endif /* CONFIG_X86_NUMAQ */
 266
 267 /*
 268  * Read/parse the MPC
 269  */
 270
 271 static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
 272 {
 273         char str[16];
 274         char oem[10];
 275         int count = sizeof(*mpc);
 276         unsigned char *mpt = ((unsigned char *)mpc) + count;
 277
 278         if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
 279                 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
 280                        mpc->mpc_signature[0], mpc->mpc_signature[1],
 281                        mpc->mpc_signature[2], mpc->mpc_signature[3]);
 282                 return 0;
 283         }
 284         if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
 285                 printk(KERN_ERR "MPTABLE: checksum error!\n");
 286                 return 0;
 287         }
 288         if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
 289                 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
 290                        mpc->mpc_spec);
 291                 return 0;
 292         }
 293         if (!mpc->mpc_lapic) {
 294                 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
 295                 return 0;
 296         }
 297         memcpy(oem, mpc->mpc_oem, 8);
 298         oem[8] = 0;
 299         printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
 300
 301         memcpy(str, mpc->mpc_productid, 12);
 302         str[12] = 0;
 303
 304 #ifdef CONFIG_X86_32
 305         mps_oem_check(mpc, oem, str);
 306 #endif
 307         printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
 308
 309         printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
 310
 311         /* save the local APIC address, it might be non-default */
 312         if (!acpi_lapic)
 313                 mp_lapic_addr = mpc->mpc_lapic;
 314
 315         if (early)
 316                 return 1;
 317
 318         /*
 319          *      Now process the configuration blocks.
 320          */
 321 #ifdef CONFIG_X86_NUMAQ
 322         mpc_record = 0;
 323 #endif
 324         while (count < mpc->mpc_length) {
 325                 switch (*mpt) {
 326                 case MP_PROCESSOR:
 327                         {
 328                                 struct mpc_config_processor *m =
 329                                     (struct mpc_config_processor *)mpt;
 330                                 /* ACPI may have already provided this data */
 331                                 if (!acpi_lapic)
 332                                         MP_processor_info(m);
 333                                 mpt += sizeof(*m);
 334                                 count += sizeof(*m);
 335                                 break;
 336                         }
 337                 case MP_BUS:
 338                         {
 339                                 struct mpc_config_bus *m =
 340                                     (struct mpc_config_bus *)mpt;
 341 #ifdef CONFIG_X86_IO_APIC
 342                                 MP_bus_info(m);
 343 #endif
 344                                 mpt += sizeof(*m);
 345                                 count += sizeof(*m);
 346                                 break;
 347                         }
 348                 case MP_IOAPIC:
 349                         {
 350 #ifdef CONFIG_X86_IO_APIC
 351                                 struct mpc_config_ioapic *m =
 352                                     (struct mpc_config_ioapic *)mpt;
 353                                 MP_ioapic_info(m);
 354 #endif
 355                                 mpt += sizeof(struct mpc_config_ioapic);
 356                                 count += sizeof(struct mpc_config_ioapic);
 357                                 break;
 358                         }
 359                 case MP_INTSRC:
 360                         {
 361 #ifdef CONFIG_X86_IO_APIC
 362                                 struct mpc_config_intsrc *m =
 363                                     (struct mpc_config_intsrc *)mpt;
 364
 365                                 MP_intsrc_info(m);
 366 #endif
 367                                 mpt += sizeof(struct mpc_config_intsrc);
 368                                 count += sizeof(struct mpc_config_intsrc);
 369                                 break;
 370                         }
 371                 case MP_LINTSRC:
 372                         {
 373                                 struct mpc_config_lintsrc *m =
 374                                     (struct mpc_config_lintsrc *)mpt;
 375                                 MP_lintsrc_info(m);
 376                                 mpt += sizeof(*m);
 377                                 count += sizeof(*m);
 378                                 break;
 379                         }
 380                 default:
 381                         /* wrong mptable */
 382                         printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
 383                         printk(KERN_ERR "type %x\n", *mpt);
 384                         print_hex_dump(KERN_ERR, "  ", DUMP_PREFIX_ADDRESS, 16,
 385                                         1, mpc, mpc->mpc_length, 1);
 386                         count = mpc->mpc_length;
 387                         break;
 388                 }
 389 #ifdef CONFIG_X86_NUMAQ
 390                 ++mpc_record;
 391 #endif
 392         }
 393         setup_apic_routing();
 394         if (!num_processors)
 395                 printk(KERN_ERR "MPTABLE: no processors registered!\n");
 396         return num_processors;
 397 }
 398
 399 #ifdef CONFIG_X86_IO_APIC
 400
 401 static int __init ELCR_trigger(unsigned int irq)
 402 {
 403         unsigned int port;
 404
 405         port = 0x4d0 + (irq >> 3);
 406         return (inb(port) >> (irq & 7)) & 1;
 407 }
 408
 409 static void __init construct_default_ioirq_mptable(int mpc_default_type)
 410 {
 411         struct mpc_config_intsrc intsrc;
 412         int i;
 413         int ELCR_fallback = 0;
 414
 415         intsrc.mpc_type = MP_INTSRC;
 416         intsrc.mpc_irqflag = 0; /* conforming */
 417         intsrc.mpc_srcbus = 0;
 418         intsrc.mpc_dstapic = mp_ioapics[0].mp_apicid;
 419
 420         intsrc.mpc_irqtype = mp_INT;
 421
 422         /*
 423          *  If true, we have an ISA/PCI system with no IRQ entries
 424          *  in the MP table. To prevent the PCI interrupts from being set up
 425          *  incorrectly, we try to use the ELCR. The sanity check to see if
 426          *  there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
 427          *  never be level sensitive, so we simply see if the ELCR agrees.
 428          *  If it does, we assume it's valid.
 429          */
 430         if (mpc_default_type == 5) {
 431                 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
 432                        "falling back to ELCR\n");
 433
 434                 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
 435                     ELCR_trigger(13))
 436                         printk(KERN_ERR "ELCR contains invalid data... "
 437                                "not using ELCR\n");
 438                 else {
 439                         printk(KERN_INFO
 440                                "Using ELCR to identify PCI interrupts\n");
 441                         ELCR_fallback = 1;
 442                 }
 443         }
 444
 445         for (i = 0; i < 16; i++) {
 446                 switch (mpc_default_type) {
 447                 case 2:
 448                         if (i == 0 || i == 13)
 449                                 continue;       /* IRQ0 & IRQ13 not connected */
 450                         /* fall through */
 451                 default:
 452                         if (i == 2)
 453                                 continue;       /* IRQ2 is never connected */
 454                 }
 455
 456                 if (ELCR_fallback) {
 457                         /*
 458                          *  If the ELCR indicates a level-sensitive interrupt, we
 459                          *  copy that information over to the MP table in the
 460                          *  irqflag field (level sensitive, active high polarity).
 461                          */
 462                         if (ELCR_trigger(i))
 463                                 intsrc.mpc_irqflag = 13;
 464                         else
 465                                 intsrc.mpc_irqflag = 0;
 466                 }
 467
 468                 intsrc.mpc_srcbusirq = i;
 469                 intsrc.mpc_dstirq = i ? i : 2;  /* IRQ0 to INTIN2 */
 470                 MP_intsrc_info(&intsrc);
 471         }
 472
 473         intsrc.mpc_irqtype = mp_ExtINT;
 474         intsrc.mpc_srcbusirq = 0;
 475         intsrc.mpc_dstirq = 0;  /* 8259A to INTIN0 */
 476         MP_intsrc_info(&intsrc);
 477 }
 478
 479
 480 static void construct_ioapic_table(int mpc_default_type)
 481 {
 482         struct mpc_config_ioapic ioapic;
 483         struct mpc_config_bus bus;
 484
 485         bus.mpc_type = MP_BUS;
 486         bus.mpc_busid = 0;
 487         switch (mpc_default_type) {
 488         default:
 489                 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
 490                        mpc_default_type);
 491                 /* fall through */
 492         case 1:
 493         case 5:
 494                 memcpy(bus.mpc_bustype, "ISA   ", 6);
 495                 break;
 496         case 2:
 497         case 6:
 498         case 3:
 499                 memcpy(bus.mpc_bustype, "EISA  ", 6);
 500                 break;
 501         case 4:
 502         case 7:
 503                 memcpy(bus.mpc_bustype, "MCA   ", 6);
 504         }
 505         MP_bus_info(&bus);
 506         if (mpc_default_type > 4) {
 507                 bus.mpc_busid = 1;
 508                 memcpy(bus.mpc_bustype, "PCI   ", 6);
 509                 MP_bus_info(&bus);
 510         }
 511
 512         ioapic.mpc_type = MP_IOAPIC;
 513         ioapic.mpc_apicid = 2;
 514         ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 515         ioapic.mpc_flags = MPC_APIC_USABLE;
 516         ioapic.mpc_apicaddr = 0xFEC00000;
 517         MP_ioapic_info(&ioapic);
 518
 519         /*
 520          * We set up most of the low 16 IO-APIC pins according to MPS rules.
 521          */
 522         construct_default_ioirq_mptable(mpc_default_type);
 523 }
 524 #else
 525 static inline void construct_ioapic_table(int mpc_default_type) { }
 526 #endif
 527
 528 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
 529 {
 530         struct mpc_config_processor processor;
 531         struct mpc_config_lintsrc lintsrc;
 532         int linttypes[2] = { mp_ExtINT, mp_NMI };
 533         int i;
 534
 535         /*
 536          * local APIC has default address
 537          */
 538         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 539
 540         /*
 541          * 2 CPUs, numbered 0 & 1.
 542          */
 543         processor.mpc_type = MP_PROCESSOR;
 544         /* Either an integrated APIC or a discrete 82489DX. */
 545         processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 546         processor.mpc_cpuflag = CPU_ENABLED;
 547         processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
 548             (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
 549         processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
 550         processor.mpc_reserved[0] = 0;
 551         processor.mpc_reserved[1] = 0;
 552         for (i = 0; i < 2; i++) {
 553                 processor.mpc_apicid = i;
 554                 MP_processor_info(&processor);
 555         }
 556
 557         construct_ioapic_table(mpc_default_type);
 558
 559         lintsrc.mpc_type = MP_LINTSRC;
 560         lintsrc.mpc_irqflag = 0;        /* conforming */
 561         lintsrc.mpc_srcbusid = 0;
 562         lintsrc.mpc_srcbusirq = 0;
 563         lintsrc.mpc_destapic = MP_APIC_ALL;
 564         for (i = 0; i < 2; i++) {
 565                 lintsrc.mpc_irqtype = linttypes[i];
 566                 lintsrc.mpc_destapiclint = i;
 567                 MP_lintsrc_info(&lintsrc);
 568         }
 569 }
 570
 571 static struct intel_mp_floating *mpf_found;
 572
 573 /*
 574  * Scan the memory blocks for an SMP configuration block.
 575  */
 576 static void __init __get_smp_config(unsigned early)
 577 {
 578         struct intel_mp_floating *mpf = mpf_found;
 579
 580         if (acpi_lapic && early)
 581                 return;
 582         /*
 583          * ACPI supports both logical (e.g. Hyper-Threading) and physical
 584          * processors, where MPS only supports physical.
 585          */
 586         if (acpi_lapic && acpi_ioapic) {
 587                 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
 588                        "information\n");
 589                 return;
 590         } else if (acpi_lapic)
 591                 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
 592                        "configuration information\n");
 593
 594         printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
 595                mpf->mpf_specification);
 596 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
 597         if (mpf->mpf_feature2 & (1 << 7)) {
 598                 printk(KERN_INFO "    IMCR and PIC compatibility mode.\n");
 599                 pic_mode = 1;
 600         } else {
 601                 printk(KERN_INFO "    Virtual Wire compatibility mode.\n");
 602                 pic_mode = 0;
 603         }
 604 #endif
 605         /*
 606          * Now see if we need to read further.
 607          */
 608         if (mpf->mpf_feature1 != 0) {
 609                 if (early) {
 610                         /*
 611                          * local APIC has default address
 612                          */
 613                         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 614                         return;
 615                 }
 616
 617                 printk(KERN_INFO "Default MP configuration #%d\n",
 618                        mpf->mpf_feature1);
 619                 construct_default_ISA_mptable(mpf->mpf_feature1);
 620
 621         } else if (mpf->mpf_physptr) {
 622
 623                 /*
 624                  * Read the physical hardware table.  Anything here will
 625                  * override the defaults.
 626                  */
 627                 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
 628 #ifdef CONFIG_X86_LOCAL_APIC
 629                         smp_found_config = 0;
 630 #endif
 631                         printk(KERN_ERR
 632                                "BIOS bug, MP table errors detected!...\n");
 633                         printk(KERN_ERR "... disabling SMP support. "
 634                                "(tell your hw vendor)\n");
 635                         return;
 636                 }
 637
 638                 if (early)
 639                         return;
 640 #ifdef CONFIG_X86_IO_APIC
 641                 /*
 642                  * If there are no explicit MP IRQ entries, then we are
 643                  * broken.  We set up most of the low 16 IO-APIC pins to
 644                  * ISA defaults and hope it will work.
 645                  */
 646                 if (!mp_irq_entries) {
 647                         struct mpc_config_bus bus;
 648
 649                         printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
 650                                "using default mptable. "
 651                                "(tell your hw vendor)\n");
 652
 653                         bus.mpc_type = MP_BUS;
 654                         bus.mpc_busid = 0;
 655                         memcpy(bus.mpc_bustype, "ISA   ", 6);
 656                         MP_bus_info(&bus);
 657
 658                         construct_default_ioirq_mptable(0);
 659                 }
 660 #endif
 661         } else
 662                 BUG();
 663
 664         if (!early)
 665                 printk(KERN_INFO "Processors: %d\n", num_processors);
 666         /*
 667          * Only use the first configuration found.
 668          */
 669 }
 670
 671 void __init early_get_smp_config(void)
 672 {
 673         __get_smp_config(1);
 674 }
 675
 676 void __init get_smp_config(void)
 677 {
 678         __get_smp_config(0);
 679 }
 680
 681 static int __init smp_scan_config(unsigned long base, unsigned long length,
 682                                   unsigned reserve)
 683 {
 684         unsigned int *bp = phys_to_virt(base);
 685         struct intel_mp_floating *mpf;
 686
 687         printk(KERN_DEBUG "Scan SMP from %p for %ld bytes.\n", bp, length);
 688         BUILD_BUG_ON(sizeof(*mpf) != 16);
 689
 690         while (length > 0) {
 691                 mpf = (struct intel_mp_floating *)bp;
 692                 if ((*bp == SMP_MAGIC_IDENT) &&
 693                     (mpf->mpf_length == 1) &&
 694                     !mpf_checksum((unsigned char *)bp, 16) &&
 695                     ((mpf->mpf_specification == 1)
 696                      || (mpf->mpf_specification == 4))) {
 697 #ifdef CONFIG_X86_LOCAL_APIC
 698                         smp_found_config = 1;
 699 #endif
 700                         mpf_found = mpf;
 701 #ifdef CONFIG_X86_32
 702                         printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
 703                                mpf, virt_to_phys(mpf));
 704                         reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE,
 705                                         BOOTMEM_DEFAULT);
 706                         if (mpf->mpf_physptr) {
 707                                 /*
 708                                  * We cannot access to MPC table to compute
 709                                  * table size yet, as only few megabytes from
 710                                  * the bottom is mapped now.
 711                                  * PC-9800's MPC table places on the very last
 712                                  * of physical memory; so that simply reserving
 713                                  * PAGE_SIZE from mpg->mpf_physptr yields BUG()
 714                                  * in reserve_bootmem.
 715                                  */
 716                                 unsigned long size = PAGE_SIZE;
 717                                 unsigned long end = max_low_pfn * PAGE_SIZE;
 718                                 if (mpf->mpf_physptr + size > end)
 719                                         size = end - mpf->mpf_physptr;
 720                                 reserve_bootmem(mpf->mpf_physptr, size,
 721                                                 BOOTMEM_DEFAULT);
 722                         }
 723
 724 #else
 725                         if (!reserve)
 726                                 return 1;
 727
 728                         reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE);
 729                         if (mpf->mpf_physptr)
 730                                 reserve_bootmem_generic(mpf->mpf_physptr,
 731                                                         PAGE_SIZE);
 732 #endif
 733                 return 1;
 734                 }
 735                 bp += 4;
 736                 length -= 16;
 737         }
 738         return 0;
 739 }
 740
 741 static void __init __find_smp_config(unsigned reserve)
 742 {
 743         unsigned int address;
 744
 745         /*
 746          * FIXME: Linux assumes you have 640K of base ram..
 747          * this continues the error...
 748          *
 749          * 1) Scan the bottom 1K for a signature
 750          * 2) Scan the top 1K of base RAM
 751          * 3) Scan the 64K of bios
 752          */
 753         if (smp_scan_config(0x0, 0x400, reserve) ||
 754             smp_scan_config(639 * 0x400, 0x400, reserve) ||
 755             smp_scan_config(0xF0000, 0x10000, reserve))
 756                 return;
 757         /*
 758          * If it is an SMP machine we should know now, unless the
 759          * configuration is in an EISA/MCA bus machine with an
 760          * extended bios data area.
 761          *
 762          * there is a real-mode segmented pointer pointing to the
 763          * 4K EBDA area at 0x40E, calculate and scan it here.
 764          *
 765          * NOTE! There are Linux loaders that will corrupt the EBDA
 766          * area, and as such this kind of SMP config may be less
 767          * trustworthy, simply because the SMP table may have been
 768          * stomped on during early boot. These loaders are buggy and
 769          * should be fixed.
 770          *
 771          * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
 772          */
 773
 774         address = get_bios_ebda();
 775         if (address)
 776                 smp_scan_config(address, 0x400, reserve);
 777 }
 778
 779 void __init early_find_smp_config(void)
 780 {
 781         __find_smp_config(0);
 782 }
 783
 784 void __init find_smp_config(void)
 785 {
 786         __find_smp_config(1);
 787 }