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 #include <asm/e820.h>
  29 #include <asm/trampoline.h>
  30 #include <asm/setup.h>
  31
  32 #include <mach_apic.h>
  33 #ifdef CONFIG_X86_32
  34 #include <mach_apicdef.h>
  35 #include <mach_mpparse.h>
  36 #endif
  37
  38 /*
  39  * Checksum an MP configuration block.
  40  */
  41
  42 static int __init mpf_checksum(unsigned char *mp, int len)
  43 {
  44         int sum = 0;
  45
  46         while (len--)
  47                 sum += *mp++;
  48
  49         return sum & 0xFF;
  50 }
  51
  52 static void __init MP_processor_info(struct mpc_config_processor *m)
  53 {
  54         int apicid;
  55         char *bootup_cpu = "";
  56
  57         if (!(m->mpc_cpuflag & CPU_ENABLED)) {
  58                 disabled_cpus++;
  59                 return;
  60         }
  61
  62         if (x86_quirks->mpc_apic_id)
  63                 apicid = x86_quirks->mpc_apic_id(m);
  64         else
  65                 apicid = m->mpc_apicid;
  66
  67         if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
  68                 bootup_cpu = " (Bootup-CPU)";
  69                 boot_cpu_physical_apicid = m->mpc_apicid;
  70         }
  71
  72         printk(KERN_INFO "Processor #%d%s\n", m->mpc_apicid, bootup_cpu);
  73         generic_processor_info(apicid, m->mpc_apicver);
  74 }
  75
  76 #ifdef CONFIG_X86_IO_APIC
  77 static void __init MP_bus_info(struct mpc_config_bus *m)
  78 {
  79         char str[7];
  80         memcpy(str, m->mpc_bustype, 6);
  81         str[6] = 0;
  82
  83         if (x86_quirks->mpc_oem_bus_info)
  84                 x86_quirks->mpc_oem_bus_info(m, str);
  85         else
  86                 apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->mpc_busid, str);
  87
  88 #if MAX_MP_BUSSES < 256
  89         if (m->mpc_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->mpc_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->mpc_busid, mp_bus_not_pci);
  99 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
 100                 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
 101 #endif
 102         } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
 103                 if (x86_quirks->mpc_oem_pci_bus)
 104                         x86_quirks->mpc_oem_pci_bus(m);
 105
 106                 clear_bit(m->mpc_busid, mp_bus_not_pci);
 107 #if defined(CONFIG_EISA) || defined (CONFIG_MCA)
 108                 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
 109         } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
 110                 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
 111         } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) {
 112                 mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
 113 #endif
 114         } else
 115                 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
 116 }
 117 #endif
 118
 119 #ifdef CONFIG_X86_IO_APIC
 120
 121 static int bad_ioapic(unsigned long address)
 122 {
 123         if (nr_ioapics >= MAX_IO_APICS) {
 124                 printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
 125                        "(found %d)\n", MAX_IO_APICS, nr_ioapics);
 126                 panic("Recompile kernel with bigger MAX_IO_APICS!\n");
 127         }
 128         if (!address) {
 129                 printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
 130                        " found in table, skipping!\n");
 131                 return 1;
 132         }
 133         return 0;
 134 }
 135
 136 static void __init MP_ioapic_info(struct mpc_config_ioapic *m)
 137 {
 138         if (!(m->mpc_flags & MPC_APIC_USABLE))
 139                 return;
 140
 141         printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n",
 142                m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
 143
 144         if (bad_ioapic(m->mpc_apicaddr))
 145                 return;
 146
 147         mp_ioapics[nr_ioapics].mp_apicaddr = m->mpc_apicaddr;
 148         mp_ioapics[nr_ioapics].mp_apicid = m->mpc_apicid;
 149         mp_ioapics[nr_ioapics].mp_type = m->mpc_type;
 150         mp_ioapics[nr_ioapics].mp_apicver = m->mpc_apicver;
 151         mp_ioapics[nr_ioapics].mp_flags = m->mpc_flags;
 152         nr_ioapics++;
 153 }
 154
 155 static void print_MP_intsrc_info(struct mpc_config_intsrc *m)
 156 {
 157         apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
 158                 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
 159                 m->mpc_irqtype, m->mpc_irqflag & 3,
 160                 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
 161                 m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
 162 }
 163
 164 static void __init print_mp_irq_info(struct mp_config_intsrc *mp_irq)
 165 {
 166         apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
 167                 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
 168                 mp_irq->mp_irqtype, mp_irq->mp_irqflag & 3,
 169                 (mp_irq->mp_irqflag >> 2) & 3, mp_irq->mp_srcbus,
 170                 mp_irq->mp_srcbusirq, mp_irq->mp_dstapic, mp_irq->mp_dstirq);
 171 }
 172
 173 static void __init assign_to_mp_irq(struct mpc_config_intsrc *m,
 174                                     struct mp_config_intsrc *mp_irq)
 175 {
 176         mp_irq->mp_dstapic = m->mpc_dstapic;
 177         mp_irq->mp_type = m->mpc_type;
 178         mp_irq->mp_irqtype = m->mpc_irqtype;
 179         mp_irq->mp_irqflag = m->mpc_irqflag;
 180         mp_irq->mp_srcbus = m->mpc_srcbus;
 181         mp_irq->mp_srcbusirq = m->mpc_srcbusirq;
 182         mp_irq->mp_dstirq = m->mpc_dstirq;
 183 }
 184
 185 static void __init assign_to_mpc_intsrc(struct mp_config_intsrc *mp_irq,
 186                                         struct mpc_config_intsrc *m)
 187 {
 188         m->mpc_dstapic = mp_irq->mp_dstapic;
 189         m->mpc_type = mp_irq->mp_type;
 190         m->mpc_irqtype = mp_irq->mp_irqtype;
 191         m->mpc_irqflag = mp_irq->mp_irqflag;
 192         m->mpc_srcbus = mp_irq->mp_srcbus;
 193         m->mpc_srcbusirq = mp_irq->mp_srcbusirq;
 194         m->mpc_dstirq = mp_irq->mp_dstirq;
 195 }
 196
 197 static int __init mp_irq_mpc_intsrc_cmp(struct mp_config_intsrc *mp_irq,
 198                                         struct mpc_config_intsrc *m)
 199 {
 200         if (mp_irq->mp_dstapic != m->mpc_dstapic)
 201                 return 1;
 202         if (mp_irq->mp_type != m->mpc_type)
 203                 return 2;
 204         if (mp_irq->mp_irqtype != m->mpc_irqtype)
 205                 return 3;
 206         if (mp_irq->mp_irqflag != m->mpc_irqflag)
 207                 return 4;
 208         if (mp_irq->mp_srcbus != m->mpc_srcbus)
 209                 return 5;
 210         if (mp_irq->mp_srcbusirq != m->mpc_srcbusirq)
 211                 return 6;
 212         if (mp_irq->mp_dstirq != m->mpc_dstirq)
 213                 return 7;
 214
 215         return 0;
 216 }
 217
 218 static void __init MP_intsrc_info(struct mpc_config_intsrc *m)
 219 {
 220         int i;
 221
 222         print_MP_intsrc_info(m);
 223
 224         for (i = 0; i < mp_irq_entries; i++) {
 225                 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m))
 226                         return;
 227         }
 228
 229         assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]);
 230         if (++mp_irq_entries == MAX_IRQ_SOURCES)
 231                 panic("Max # of irq sources exceeded!!\n");
 232 }
 233
 234 #endif
 235
 236 static void __init MP_lintsrc_info(struct mpc_config_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->mpc_irqtype, m->mpc_irqflag & 3,
 241                 (m->mpc_irqflag >> 2) & 3, m->mpc_srcbusid,
 242                 m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
 243 }
 244
 245 /*
 246  * Read/parse the MPC
 247  */
 248
 249 static int __init smp_check_mpc(struct mp_config_table *mpc, char *oem,
 250                                 char *str)
 251 {
 252
 253         if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
 254                 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
 255                        mpc->mpc_signature[0], mpc->mpc_signature[1],
 256                        mpc->mpc_signature[2], mpc->mpc_signature[3]);
 257                 return 0;
 258         }
 259         if (mpf_checksum((unsigned char *)mpc, mpc->mpc_length)) {
 260                 printk(KERN_ERR "MPTABLE: checksum error!\n");
 261                 return 0;
 262         }
 263         if (mpc->mpc_spec != 0x01 && mpc->mpc_spec != 0x04) {
 264                 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
 265                        mpc->mpc_spec);
 266                 return 0;
 267         }
 268         if (!mpc->mpc_lapic) {
 269                 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
 270                 return 0;
 271         }
 272         memcpy(oem, mpc->mpc_oem, 8);
 273         oem[8] = 0;
 274         printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
 275
 276         memcpy(str, mpc->mpc_productid, 12);
 277         str[12] = 0;
 278
 279         printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
 280
 281         printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
 282
 283         return 1;
 284 }
 285
 286 static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
 287 {
 288         char str[16];
 289         char oem[10];
 290
 291         int count = sizeof(*mpc);
 292         unsigned char *mpt = ((unsigned char *)mpc) + count;
 293
 294         if (!smp_check_mpc(mpc, oem, str))
 295                 return 0;
 296
 297 #ifdef CONFIG_X86_32
 298         /*
 299          * need to make sure summit and es7000's mps_oem_check is safe to be
 300          * called early via genericarch 's mps_oem_check
 301          */
 302         if (early) {
 303 #ifdef CONFIG_X86_NUMAQ
 304                 numaq_mps_oem_check(mpc, oem, str);
 305 #endif
 306         } else
 307                 mps_oem_check(mpc, oem, str);
 308 #endif
 309         /* save the local APIC address, it might be non-default */
 310         if (!acpi_lapic)
 311                 mp_lapic_addr = mpc->mpc_lapic;
 312
 313         if (early)
 314                 return 1;
 315
 316         if (mpc->mpc_oemptr && x86_quirks->smp_read_mpc_oem) {
 317                 struct mp_config_oemtable *oem_table = (struct mp_config_oemtable *)(unsigned long)mpc->mpc_oemptr;
 318                 x86_quirks->smp_read_mpc_oem(oem_table, mpc->mpc_oemsize);
 319         }
 320
 321         /*
 322          *      Now process the configuration blocks.
 323          */
 324         if (x86_quirks->mpc_record)
 325                 *x86_quirks->mpc_record = 0;
 326
 327         while (count < mpc->mpc_length) {
 328                 switch (*mpt) {
 329                 case MP_PROCESSOR:
 330                         {
 331                                 struct mpc_config_processor *m =
 332                                     (struct mpc_config_processor *)mpt;
 333                                 /* ACPI may have already provided this data */
 334                                 if (!acpi_lapic)
 335                                         MP_processor_info(m);
 336                                 mpt += sizeof(*m);
 337                                 count += sizeof(*m);
 338                                 break;
 339                         }
 340                 case MP_BUS:
 341                         {
 342                                 struct mpc_config_bus *m =
 343                                     (struct mpc_config_bus *)mpt;
 344 #ifdef CONFIG_X86_IO_APIC
 345                                 MP_bus_info(m);
 346 #endif
 347                                 mpt += sizeof(*m);
 348                                 count += sizeof(*m);
 349                                 break;
 350                         }
 351                 case MP_IOAPIC:
 352                         {
 353 #ifdef CONFIG_X86_IO_APIC
 354                                 struct mpc_config_ioapic *m =
 355                                     (struct mpc_config_ioapic *)mpt;
 356                                 MP_ioapic_info(m);
 357 #endif
 358                                 mpt += sizeof(struct mpc_config_ioapic);
 359                                 count += sizeof(struct mpc_config_ioapic);
 360                                 break;
 361                         }
 362                 case MP_INTSRC:
 363                         {
 364 #ifdef CONFIG_X86_IO_APIC
 365                                 struct mpc_config_intsrc *m =
 366                                     (struct mpc_config_intsrc *)mpt;
 367
 368                                 MP_intsrc_info(m);
 369 #endif
 370                                 mpt += sizeof(struct mpc_config_intsrc);
 371                                 count += sizeof(struct mpc_config_intsrc);
 372                                 break;
 373                         }
 374                 case MP_LINTSRC:
 375                         {
 376                                 struct mpc_config_lintsrc *m =
 377                                     (struct mpc_config_lintsrc *)mpt;
 378                                 MP_lintsrc_info(m);
 379                                 mpt += sizeof(*m);
 380                                 count += sizeof(*m);
 381                                 break;
 382                         }
 383                 default:
 384                         /* wrong mptable */
 385                         printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
 386                         printk(KERN_ERR "type %x\n", *mpt);
 387                         print_hex_dump(KERN_ERR, "  ", DUMP_PREFIX_ADDRESS, 16,
 388                                         1, mpc, mpc->mpc_length, 1);
 389                         count = mpc->mpc_length;
 390                         break;
 391                 }
 392                 if (x86_quirks->mpc_record)
 393                         (*x86_quirks->mpc_record)++;
 394         }
 395
 396 #ifdef CONFIG_X86_GENERICARCH
 397        generic_bigsmp_probe();
 398 #endif
 399
 400 #ifdef CONFIG_X86_32
 401         setup_apic_routing();
 402 #endif
 403         if (!num_processors)
 404                 printk(KERN_ERR "MPTABLE: no processors registered!\n");
 405         return num_processors;
 406 }
 407
 408 #ifdef CONFIG_X86_IO_APIC
 409
 410 static int __init ELCR_trigger(unsigned int irq)
 411 {
 412         unsigned int port;
 413
 414         port = 0x4d0 + (irq >> 3);
 415         return (inb(port) >> (irq & 7)) & 1;
 416 }
 417
 418 static void __init construct_default_ioirq_mptable(int mpc_default_type)
 419 {
 420         struct mpc_config_intsrc intsrc;
 421         int i;
 422         int ELCR_fallback = 0;
 423
 424         intsrc.mpc_type = MP_INTSRC;
 425         intsrc.mpc_irqflag = 0; /* conforming */
 426         intsrc.mpc_srcbus = 0;
 427         intsrc.mpc_dstapic = mp_ioapics[0].mp_apicid;
 428
 429         intsrc.mpc_irqtype = mp_INT;
 430
 431         /*
 432          *  If true, we have an ISA/PCI system with no IRQ entries
 433          *  in the MP table. To prevent the PCI interrupts from being set up
 434          *  incorrectly, we try to use the ELCR. The sanity check to see if
 435          *  there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
 436          *  never be level sensitive, so we simply see if the ELCR agrees.
 437          *  If it does, we assume it's valid.
 438          */
 439         if (mpc_default_type == 5) {
 440                 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
 441                        "falling back to ELCR\n");
 442
 443                 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
 444                     ELCR_trigger(13))
 445                         printk(KERN_ERR "ELCR contains invalid data... "
 446                                "not using ELCR\n");
 447                 else {
 448                         printk(KERN_INFO
 449                                "Using ELCR to identify PCI interrupts\n");
 450                         ELCR_fallback = 1;
 451                 }
 452         }
 453
 454         for (i = 0; i < 16; i++) {
 455                 switch (mpc_default_type) {
 456                 case 2:
 457                         if (i == 0 || i == 13)
 458                                 continue;       /* IRQ0 & IRQ13 not connected */
 459                         /* fall through */
 460                 default:
 461                         if (i == 2)
 462                                 continue;       /* IRQ2 is never connected */
 463                 }
 464
 465                 if (ELCR_fallback) {
 466                         /*
 467                          *  If the ELCR indicates a level-sensitive interrupt, we
 468                          *  copy that information over to the MP table in the
 469                          *  irqflag field (level sensitive, active high polarity).
 470                          */
 471                         if (ELCR_trigger(i))
 472                                 intsrc.mpc_irqflag = 13;
 473                         else
 474                                 intsrc.mpc_irqflag = 0;
 475                 }
 476
 477                 intsrc.mpc_srcbusirq = i;
 478                 intsrc.mpc_dstirq = i ? i : 2;  /* IRQ0 to INTIN2 */
 479                 MP_intsrc_info(&intsrc);
 480         }
 481
 482         intsrc.mpc_irqtype = mp_ExtINT;
 483         intsrc.mpc_srcbusirq = 0;
 484         intsrc.mpc_dstirq = 0;  /* 8259A to INTIN0 */
 485         MP_intsrc_info(&intsrc);
 486 }
 487
 488
 489 static void __init construct_ioapic_table(int mpc_default_type)
 490 {
 491         struct mpc_config_ioapic ioapic;
 492         struct mpc_config_bus bus;
 493
 494         bus.mpc_type = MP_BUS;
 495         bus.mpc_busid = 0;
 496         switch (mpc_default_type) {
 497         default:
 498                 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
 499                        mpc_default_type);
 500                 /* fall through */
 501         case 1:
 502         case 5:
 503                 memcpy(bus.mpc_bustype, "ISA   ", 6);
 504                 break;
 505         case 2:
 506         case 6:
 507         case 3:
 508                 memcpy(bus.mpc_bustype, "EISA  ", 6);
 509                 break;
 510         case 4:
 511         case 7:
 512                 memcpy(bus.mpc_bustype, "MCA   ", 6);
 513         }
 514         MP_bus_info(&bus);
 515         if (mpc_default_type > 4) {
 516                 bus.mpc_busid = 1;
 517                 memcpy(bus.mpc_bustype, "PCI   ", 6);
 518                 MP_bus_info(&bus);
 519         }
 520
 521         ioapic.mpc_type = MP_IOAPIC;
 522         ioapic.mpc_apicid = 2;
 523         ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 524         ioapic.mpc_flags = MPC_APIC_USABLE;
 525         ioapic.mpc_apicaddr = 0xFEC00000;
 526         MP_ioapic_info(&ioapic);
 527
 528         /*
 529          * We set up most of the low 16 IO-APIC pins according to MPS rules.
 530          */
 531         construct_default_ioirq_mptable(mpc_default_type);
 532 }
 533 #else
 534 static inline void __init construct_ioapic_table(int mpc_default_type) { }
 535 #endif
 536
 537 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
 538 {
 539         struct mpc_config_processor processor;
 540         struct mpc_config_lintsrc lintsrc;
 541         int linttypes[2] = { mp_ExtINT, mp_NMI };
 542         int i;
 543
 544         /*
 545          * local APIC has default address
 546          */
 547         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 548
 549         /*
 550          * 2 CPUs, numbered 0 & 1.
 551          */
 552         processor.mpc_type = MP_PROCESSOR;
 553         /* Either an integrated APIC or a discrete 82489DX. */
 554         processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 555         processor.mpc_cpuflag = CPU_ENABLED;
 556         processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
 557             (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
 558         processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
 559         processor.mpc_reserved[0] = 0;
 560         processor.mpc_reserved[1] = 0;
 561         for (i = 0; i < 2; i++) {
 562                 processor.mpc_apicid = i;
 563                 MP_processor_info(&processor);
 564         }
 565
 566         construct_ioapic_table(mpc_default_type);
 567
 568         lintsrc.mpc_type = MP_LINTSRC;
 569         lintsrc.mpc_irqflag = 0;        /* conforming */
 570         lintsrc.mpc_srcbusid = 0;
 571         lintsrc.mpc_srcbusirq = 0;
 572         lintsrc.mpc_destapic = MP_APIC_ALL;
 573         for (i = 0; i < 2; i++) {
 574                 lintsrc.mpc_irqtype = linttypes[i];
 575                 lintsrc.mpc_destapiclint = i;
 576                 MP_lintsrc_info(&lintsrc);
 577         }
 578 }
 579
 580 static struct intel_mp_floating *mpf_found;
 581
 582 /*
 583  * Scan the memory blocks for an SMP configuration block.
 584  */
 585 static void __init __get_smp_config(unsigned int early)
 586 {
 587         struct intel_mp_floating *mpf = mpf_found;
 588
 589         if (x86_quirks->mach_get_smp_config) {
 590                 if (x86_quirks->mach_get_smp_config(early))
 591                         return;
 592         }
 593         if (acpi_lapic && early)
 594                 return;
 595         /*
 596          * ACPI supports both logical (e.g. Hyper-Threading) and physical
 597          * processors, where MPS only supports physical.
 598          */
 599         if (acpi_lapic && acpi_ioapic) {
 600                 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
 601                        "information\n");
 602                 return;
 603         } else if (acpi_lapic)
 604                 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
 605                        "configuration information\n");
 606
 607         if (!mpf)
 608                 return;
 609
 610         printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
 611                mpf->mpf_specification);
 612 #if defined(CONFIG_X86_LOCAL_APIC) && defined(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 #ifdef CONFIG_X86_LOCAL_APIC
 645                         smp_found_config = 0;
 646 #endif
 647                         printk(KERN_ERR
 648                                "BIOS bug, MP table errors detected!...\n");
 649                         printk(KERN_ERR "... disabling SMP support. "
 650                                "(tell your hw vendor)\n");
 651                         return;
 652                 }
 653
 654                 if (early)
 655                         return;
 656 #ifdef CONFIG_X86_IO_APIC
 657                 /*
 658                  * If there are no explicit MP IRQ entries, then we are
 659                  * broken.  We set up most of the low 16 IO-APIC pins to
 660                  * ISA defaults and hope it will work.
 661                  */
 662                 if (!mp_irq_entries) {
 663                         struct mpc_config_bus bus;
 664
 665                         printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
 666                                "using default mptable. "
 667                                "(tell your hw vendor)\n");
 668
 669                         bus.mpc_type = MP_BUS;
 670                         bus.mpc_busid = 0;
 671                         memcpy(bus.mpc_bustype, "ISA   ", 6);
 672                         MP_bus_info(&bus);
 673
 674                         construct_default_ioirq_mptable(0);
 675                 }
 676 #endif
 677         } else
 678                 BUG();
 679
 680         if (!early)
 681                 printk(KERN_INFO "Processors: %d\n", num_processors);
 682         /*
 683          * Only use the first configuration found.
 684          */
 685 }
 686
 687 void __init early_get_smp_config(void)
 688 {
 689         __get_smp_config(1);
 690 }
 691
 692 void __init get_smp_config(void)
 693 {
 694         __get_smp_config(0);
 695 }
 696
 697 static int __init smp_scan_config(unsigned long base, unsigned long length,
 698                                   unsigned reserve)
 699 {
 700         unsigned int *bp = phys_to_virt(base);
 701         struct intel_mp_floating *mpf;
 702
 703         apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
 704                         bp, length);
 705         BUILD_BUG_ON(sizeof(*mpf) != 16);
 706
 707         while (length > 0) {
 708                 mpf = (struct intel_mp_floating *)bp;
 709                 if ((*bp == SMP_MAGIC_IDENT) &&
 710                     (mpf->mpf_length == 1) &&
 711                     !mpf_checksum((unsigned char *)bp, 16) &&
 712                     ((mpf->mpf_specification == 1)
 713                      || (mpf->mpf_specification == 4))) {
 714 #ifdef CONFIG_X86_LOCAL_APIC
 715                         smp_found_config = 1;
 716 #endif
 717                         mpf_found = mpf;
 718
 719                         printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
 720                                mpf, virt_to_phys(mpf));
 721
 722                         if (!reserve)
 723                                 return 1;
 724                         reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE,
 725                                         BOOTMEM_DEFAULT);
 726                         if (mpf->mpf_physptr) {
 727                                 unsigned long size = PAGE_SIZE;
 728 #ifdef CONFIG_X86_32
 729                                 /*
 730                                  * We cannot access to MPC table to compute
 731                                  * table size yet, as only few megabytes from
 732                                  * the bottom is mapped now.
 733                                  * PC-9800's MPC table places on the very last
 734                                  * of physical memory; so that simply reserving
 735                                  * PAGE_SIZE from mpg->mpf_physptr yields BUG()
 736                                  * in reserve_bootmem.
 737                                  */
 738                                 unsigned long end = max_low_pfn * PAGE_SIZE;
 739                                 if (mpf->mpf_physptr + size > end)
 740                                         size = end - mpf->mpf_physptr;
 741 #endif
 742                                 reserve_bootmem_generic(mpf->mpf_physptr, size,
 743                                                 BOOTMEM_DEFAULT);
 744                         }
 745
 746                         return 1;
 747                 }
 748                 bp += 4;
 749                 length -= 16;
 750         }
 751         return 0;
 752 }
 753
 754 static void __init __find_smp_config(unsigned int reserve)
 755 {
 756         unsigned int address;
 757
 758         if (x86_quirks->mach_find_smp_config) {
 759                 if (x86_quirks->mach_find_smp_config(reserve))
 760                         return;
 761         }
 762         /*
 763          * FIXME: Linux assumes you have 640K of base ram..
 764          * this continues the error...
 765          *
 766          * 1) Scan the bottom 1K for a signature
 767          * 2) Scan the top 1K of base RAM
 768          * 3) Scan the 64K of bios
 769          */
 770         if (smp_scan_config(0x0, 0x400, reserve) ||
 771             smp_scan_config(639 * 0x400, 0x400, reserve) ||
 772             smp_scan_config(0xF0000, 0x10000, reserve))
 773                 return;
 774         /*
 775          * If it is an SMP machine we should know now, unless the
 776          * configuration is in an EISA/MCA bus machine with an
 777          * extended bios data area.
 778          *
 779          * there is a real-mode segmented pointer pointing to the
 780          * 4K EBDA area at 0x40E, calculate and scan it here.
 781          *
 782          * NOTE! There are Linux loaders that will corrupt the EBDA
 783          * area, and as such this kind of SMP config may be less
 784          * trustworthy, simply because the SMP table may have been
 785          * stomped on during early boot. These loaders are buggy and
 786          * should be fixed.
 787          *
 788          * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
 789          */
 790
 791         address = get_bios_ebda();
 792         if (address)
 793                 smp_scan_config(address, 0x400, reserve);
 794 }
 795
 796 void __init early_find_smp_config(void)
 797 {
 798         __find_smp_config(0);
 799 }
 800
 801 void __init find_smp_config(void)
 802 {
 803         __find_smp_config(1);
 804 }
 805
 806 #ifdef CONFIG_X86_IO_APIC
 807 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
 808
 809 static int  __init get_MP_intsrc_index(struct mpc_config_intsrc *m)
 810 {
 811         int i;
 812
 813         if (m->mpc_irqtype != mp_INT)
 814                 return 0;
 815
 816         if (m->mpc_irqflag != 0x0f)
 817                 return 0;
 818
 819         /* not legacy */
 820
 821         for (i = 0; i < mp_irq_entries; i++) {
 822                 if (mp_irqs[i].mp_irqtype != mp_INT)
 823                         continue;
 824
 825                 if (mp_irqs[i].mp_irqflag != 0x0f)
 826                         continue;
 827
 828                 if (mp_irqs[i].mp_srcbus != m->mpc_srcbus)
 829                         continue;
 830                 if (mp_irqs[i].mp_srcbusirq != m->mpc_srcbusirq)
 831                         continue;
 832                 if (irq_used[i]) {
 833                         /* already claimed */
 834                         return -2;
 835                 }
 836                 irq_used[i] = 1;
 837                 return i;
 838         }
 839
 840         /* not found */
 841         return -1;
 842 }
 843
 844 #define SPARE_SLOT_NUM 20
 845
 846 static struct mpc_config_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
 847 #endif
 848
 849 static int  __init replace_intsrc_all(struct mp_config_table *mpc,
 850                                         unsigned long mpc_new_phys,
 851                                         unsigned long mpc_new_length)
 852 {
 853 #ifdef CONFIG_X86_IO_APIC
 854         int i;
 855         int nr_m_spare = 0;
 856 #endif
 857
 858         int count = sizeof(*mpc);
 859         unsigned char *mpt = ((unsigned char *)mpc) + count;
 860
 861         printk(KERN_INFO "mpc_length %x\n", mpc->mpc_length);
 862         while (count < mpc->mpc_length) {
 863                 switch (*mpt) {
 864                 case MP_PROCESSOR:
 865                         {
 866                                 struct mpc_config_processor *m =
 867                                     (struct mpc_config_processor *)mpt;
 868                                 mpt += sizeof(*m);
 869                                 count += sizeof(*m);
 870                                 break;
 871                         }
 872                 case MP_BUS:
 873                         {
 874                                 struct mpc_config_bus *m =
 875                                     (struct mpc_config_bus *)mpt;
 876                                 mpt += sizeof(*m);
 877                                 count += sizeof(*m);
 878                                 break;
 879                         }
 880                 case MP_IOAPIC:
 881                         {
 882                                 mpt += sizeof(struct mpc_config_ioapic);
 883                                 count += sizeof(struct mpc_config_ioapic);
 884                                 break;
 885                         }
 886                 case MP_INTSRC:
 887                         {
 888 #ifdef CONFIG_X86_IO_APIC
 889                                 struct mpc_config_intsrc *m =
 890                                     (struct mpc_config_intsrc *)mpt;
 891
 892                                 printk(KERN_INFO "OLD ");
 893                                 print_MP_intsrc_info(m);
 894                                 i = get_MP_intsrc_index(m);
 895                                 if (i > 0) {
 896                                         assign_to_mpc_intsrc(&mp_irqs[i], m);
 897                                         printk(KERN_INFO "NEW ");
 898                                         print_mp_irq_info(&mp_irqs[i]);
 899                                 } else if (!i) {
 900                                         /* legacy, do nothing */
 901                                 } else if (nr_m_spare < SPARE_SLOT_NUM) {
 902                                         /*
 903                                          * not found (-1), or duplicated (-2)
 904                                          * are invalid entries,
 905                                          * we need to use the slot  later
 906                                          */
 907                                         m_spare[nr_m_spare] = m;
 908                                         nr_m_spare++;
 909                                 }
 910 #endif
 911                                 mpt += sizeof(struct mpc_config_intsrc);
 912                                 count += sizeof(struct mpc_config_intsrc);
 913                                 break;
 914                         }
 915                 case MP_LINTSRC:
 916                         {
 917                                 struct mpc_config_lintsrc *m =
 918                                     (struct mpc_config_lintsrc *)mpt;
 919                                 mpt += sizeof(*m);
 920                                 count += sizeof(*m);
 921                                 break;
 922                         }
 923                 default:
 924                         /* wrong mptable */
 925                         printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
 926                         printk(KERN_ERR "type %x\n", *mpt);
 927                         print_hex_dump(KERN_ERR, "  ", DUMP_PREFIX_ADDRESS, 16,
 928                                         1, mpc, mpc->mpc_length, 1);
 929                         goto out;
 930                 }
 931         }
 932
 933 #ifdef CONFIG_X86_IO_APIC
 934         for (i = 0; i < mp_irq_entries; i++) {
 935                 if (irq_used[i])
 936                         continue;
 937
 938                 if (mp_irqs[i].mp_irqtype != mp_INT)
 939                         continue;
 940
 941                 if (mp_irqs[i].mp_irqflag != 0x0f)
 942                         continue;
 943
 944                 if (nr_m_spare > 0) {
 945                         printk(KERN_INFO "*NEW* found ");
 946                         nr_m_spare--;
 947                         assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
 948                         m_spare[nr_m_spare] = NULL;
 949                 } else {
 950                         struct mpc_config_intsrc *m =
 951                             (struct mpc_config_intsrc *)mpt;
 952                         count += sizeof(struct mpc_config_intsrc);
 953                         if (!mpc_new_phys) {
 954                                 printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
 955                         } else {
 956                                 if (count <= mpc_new_length)
 957                                         printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
 958                                 else {
 959                                         printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
 960                                         goto out;
 961                                 }
 962                         }
 963                         assign_to_mpc_intsrc(&mp_irqs[i], m);
 964                         mpc->mpc_length = count;
 965                         mpt += sizeof(struct mpc_config_intsrc);
 966                 }
 967                 print_mp_irq_info(&mp_irqs[i]);
 968         }
 969 #endif
 970 out:
 971         /* update checksum */
 972         mpc->mpc_checksum = 0;
 973         mpc->mpc_checksum -= mpf_checksum((unsigned char *)mpc,
 974                                            mpc->mpc_length);
 975
 976         return 0;
 977 }
 978
 979 static int __initdata enable_update_mptable;
 980
 981 static int __init update_mptable_setup(char *str)
 982 {
 983         enable_update_mptable = 1;
 984         return 0;
 985 }
 986 early_param("update_mptable", update_mptable_setup);
 987
 988 static unsigned long __initdata mpc_new_phys;
 989 static unsigned long mpc_new_length __initdata = 4096;
 990
 991 /* alloc_mptable or alloc_mptable=4k */
 992 static int __initdata alloc_mptable;
 993 static int __init parse_alloc_mptable_opt(char *p)
 994 {
 995         enable_update_mptable = 1;
 996         alloc_mptable = 1;
 997         if (!p)
 998                 return 0;
 999         mpc_new_length = memparse(p, &p);
1000         return 0;
1001 }
1002 early_param("alloc_mptable", parse_alloc_mptable_opt);
1003
1004 void __init early_reserve_e820_mpc_new(void)
1005 {
1006         if (enable_update_mptable && alloc_mptable) {
1007                 u64 startt = 0;
1008 #ifdef CONFIG_X86_TRAMPOLINE
1009                 startt = TRAMPOLINE_BASE;
1010 #endif
1011                 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
1012         }
1013 }
1014
1015 static int __init update_mp_table(void)
1016 {
1017         char str[16];
1018         char oem[10];
1019         struct intel_mp_floating *mpf;
1020         struct mp_config_table *mpc;
1021         struct mp_config_table *mpc_new;
1022
1023         if (!enable_update_mptable)
1024                 return 0;
1025
1026         mpf = mpf_found;
1027         if (!mpf)
1028                 return 0;
1029
1030         /*
1031          * Now see if we need to go further.
1032          */
1033         if (mpf->mpf_feature1 != 0)
1034                 return 0;
1035
1036         if (!mpf->mpf_physptr)
1037                 return 0;
1038
1039         mpc = phys_to_virt(mpf->mpf_physptr);
1040
1041         if (!smp_check_mpc(mpc, oem, str))
1042                 return 0;
1043
1044         printk(KERN_INFO "mpf: %lx\n", virt_to_phys(mpf));
1045         printk(KERN_INFO "mpf_physptr: %x\n", mpf->mpf_physptr);
1046
1047         if (mpc_new_phys && mpc->mpc_length > mpc_new_length) {
1048                 mpc_new_phys = 0;
1049                 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
1050                          mpc_new_length);
1051         }
1052
1053         if (!mpc_new_phys) {
1054                 unsigned char old, new;
1055                 /* check if we can change the postion */
1056                 mpc->mpc_checksum = 0;
1057                 old = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1058                 mpc->mpc_checksum = 0xff;
1059                 new = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1060                 if (old == new) {
1061                         printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
1062                         return 0;
1063                 }
1064                 printk(KERN_INFO "use in-positon replacing\n");
1065         } else {
1066                 mpf->mpf_physptr = mpc_new_phys;
1067                 mpc_new = phys_to_virt(mpc_new_phys);
1068                 memcpy(mpc_new, mpc, mpc->mpc_length);
1069                 mpc = mpc_new;
1070                 /* check if we can modify that */
1071                 if (mpc_new_phys - mpf->mpf_physptr) {
1072                         struct intel_mp_floating *mpf_new;
1073                         /* steal 16 bytes from [0, 1k) */
1074                         printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
1075                         mpf_new = phys_to_virt(0x400 - 16);
1076                         memcpy(mpf_new, mpf, 16);
1077                         mpf = mpf_new;
1078                         mpf->mpf_physptr = mpc_new_phys;
1079                 }
1080                 mpf->mpf_checksum = 0;
1081                 mpf->mpf_checksum -= mpf_checksum((unsigned char *)mpf, 16);
1082                 printk(KERN_INFO "mpf_physptr new: %x\n", mpf->mpf_physptr);
1083         }
1084
1085         /*
1086          * only replace the one with mp_INT and
1087          *       MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1088          * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1089          * may need pci=routeirq for all coverage
1090          */
1091         replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1092
1093         return 0;
1094 }
1095
1096 late_initcall(update_mp_table);