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         printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
 608                mpf->mpf_specification);
 609 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
 610         if (mpf->mpf_feature2 & (1 << 7)) {
 611                 printk(KERN_INFO "    IMCR and PIC compatibility mode.\n");
 612                 pic_mode = 1;
 613         } else {
 614                 printk(KERN_INFO "    Virtual Wire compatibility mode.\n");
 615                 pic_mode = 0;
 616         }
 617 #endif
 618         /*
 619          * Now see if we need to read further.
 620          */
 621         if (mpf->mpf_feature1 != 0) {
 622                 if (early) {
 623                         /*
 624                          * local APIC has default address
 625                          */
 626                         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 627                         return;
 628                 }
 629
 630                 printk(KERN_INFO "Default MP configuration #%d\n",
 631                        mpf->mpf_feature1);
 632                 construct_default_ISA_mptable(mpf->mpf_feature1);
 633
 634         } else if (mpf->mpf_physptr) {
 635
 636                 /*
 637                  * Read the physical hardware table.  Anything here will
 638                  * override the defaults.
 639                  */
 640                 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) {
 641 #ifdef CONFIG_X86_LOCAL_APIC
 642                         smp_found_config = 0;
 643 #endif
 644                         printk(KERN_ERR
 645                                "BIOS bug, MP table errors detected!...\n");
 646                         printk(KERN_ERR "... disabling SMP support. "
 647                                "(tell your hw vendor)\n");
 648                         return;
 649                 }
 650
 651                 if (early)
 652                         return;
 653 #ifdef CONFIG_X86_IO_APIC
 654                 /*
 655                  * If there are no explicit MP IRQ entries, then we are
 656                  * broken.  We set up most of the low 16 IO-APIC pins to
 657                  * ISA defaults and hope it will work.
 658                  */
 659                 if (!mp_irq_entries) {
 660                         struct mpc_config_bus bus;
 661
 662                         printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
 663                                "using default mptable. "
 664                                "(tell your hw vendor)\n");
 665
 666                         bus.mpc_type = MP_BUS;
 667                         bus.mpc_busid = 0;
 668                         memcpy(bus.mpc_bustype, "ISA   ", 6);
 669                         MP_bus_info(&bus);
 670
 671                         construct_default_ioirq_mptable(0);
 672                 }
 673 #endif
 674         } else
 675                 BUG();
 676
 677         if (!early)
 678                 printk(KERN_INFO "Processors: %d\n", num_processors);
 679         /*
 680          * Only use the first configuration found.
 681          */
 682 }
 683
 684 void __init early_get_smp_config(void)
 685 {
 686         __get_smp_config(1);
 687 }
 688
 689 void __init get_smp_config(void)
 690 {
 691         __get_smp_config(0);
 692 }
 693
 694 static int __init smp_scan_config(unsigned long base, unsigned long length,
 695                                   unsigned reserve)
 696 {
 697         unsigned int *bp = phys_to_virt(base);
 698         struct intel_mp_floating *mpf;
 699
 700         apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
 701                         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 #ifdef CONFIG_X86_LOCAL_APIC
 712                         smp_found_config = 1;
 713 #endif
 714                         mpf_found = mpf;
 715
 716                         printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n",
 717                                mpf, virt_to_phys(mpf));
 718
 719                         if (!reserve)
 720                                 return 1;
 721                         reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE,
 722                                         BOOTMEM_DEFAULT);
 723                         if (mpf->mpf_physptr) {
 724                                 unsigned long size = PAGE_SIZE;
 725 #ifdef CONFIG_X86_32
 726                                 /*
 727                                  * We cannot access to MPC table to compute
 728                                  * table size yet, as only few megabytes from
 729                                  * the bottom is mapped now.
 730                                  * PC-9800's MPC table places on the very last
 731                                  * of physical memory; so that simply reserving
 732                                  * PAGE_SIZE from mpg->mpf_physptr yields BUG()
 733                                  * in reserve_bootmem.
 734                                  */
 735                                 unsigned long end = max_low_pfn * PAGE_SIZE;
 736                                 if (mpf->mpf_physptr + size > end)
 737                                         size = end - mpf->mpf_physptr;
 738 #endif
 739                                 reserve_bootmem_generic(mpf->mpf_physptr, size,
 740                                                 BOOTMEM_DEFAULT);
 741                         }
 742
 743                         return 1;
 744                 }
 745                 bp += 4;
 746                 length -= 16;
 747         }
 748         return 0;
 749 }
 750
 751 static void __init __find_smp_config(unsigned int reserve)
 752 {
 753         unsigned int address;
 754
 755         if (x86_quirks->mach_find_smp_config) {
 756                 if (x86_quirks->mach_find_smp_config(reserve))
 757                         return;
 758         }
 759         /*
 760          * FIXME: Linux assumes you have 640K of base ram..
 761          * this continues the error...
 762          *
 763          * 1) Scan the bottom 1K for a signature
 764          * 2) Scan the top 1K of base RAM
 765          * 3) Scan the 64K of bios
 766          */
 767         if (smp_scan_config(0x0, 0x400, reserve) ||
 768             smp_scan_config(639 * 0x400, 0x400, reserve) ||
 769             smp_scan_config(0xF0000, 0x10000, reserve))
 770                 return;
 771         /*
 772          * If it is an SMP machine we should know now, unless the
 773          * configuration is in an EISA/MCA bus machine with an
 774          * extended bios data area.
 775          *
 776          * there is a real-mode segmented pointer pointing to the
 777          * 4K EBDA area at 0x40E, calculate and scan it here.
 778          *
 779          * NOTE! There are Linux loaders that will corrupt the EBDA
 780          * area, and as such this kind of SMP config may be less
 781          * trustworthy, simply because the SMP table may have been
 782          * stomped on during early boot. These loaders are buggy and
 783          * should be fixed.
 784          *
 785          * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
 786          */
 787
 788         address = get_bios_ebda();
 789         if (address)
 790                 smp_scan_config(address, 0x400, reserve);
 791 }
 792
 793 void __init early_find_smp_config(void)
 794 {
 795         __find_smp_config(0);
 796 }
 797
 798 void __init find_smp_config(void)
 799 {
 800         __find_smp_config(1);
 801 }
 802
 803 #ifdef CONFIG_X86_IO_APIC
 804 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
 805
 806 static int  __init get_MP_intsrc_index(struct mpc_config_intsrc *m)
 807 {
 808         int i;
 809
 810         if (m->mpc_irqtype != mp_INT)
 811                 return 0;
 812
 813         if (m->mpc_irqflag != 0x0f)
 814                 return 0;
 815
 816         /* not legacy */
 817
 818         for (i = 0; i < mp_irq_entries; i++) {
 819                 if (mp_irqs[i].mp_irqtype != mp_INT)
 820                         continue;
 821
 822                 if (mp_irqs[i].mp_irqflag != 0x0f)
 823                         continue;
 824
 825                 if (mp_irqs[i].mp_srcbus != m->mpc_srcbus)
 826                         continue;
 827                 if (mp_irqs[i].mp_srcbusirq != m->mpc_srcbusirq)
 828                         continue;
 829                 if (irq_used[i]) {
 830                         /* already claimed */
 831                         return -2;
 832                 }
 833                 irq_used[i] = 1;
 834                 return i;
 835         }
 836
 837         /* not found */
 838         return -1;
 839 }
 840
 841 #define SPARE_SLOT_NUM 20
 842
 843 static struct mpc_config_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
 844 #endif
 845
 846 static int  __init replace_intsrc_all(struct mp_config_table *mpc,
 847                                         unsigned long mpc_new_phys,
 848                                         unsigned long mpc_new_length)
 849 {
 850 #ifdef CONFIG_X86_IO_APIC
 851         int i;
 852         int nr_m_spare = 0;
 853 #endif
 854
 855         int count = sizeof(*mpc);
 856         unsigned char *mpt = ((unsigned char *)mpc) + count;
 857
 858         printk(KERN_INFO "mpc_length %x\n", mpc->mpc_length);
 859         while (count < mpc->mpc_length) {
 860                 switch (*mpt) {
 861                 case MP_PROCESSOR:
 862                         {
 863                                 struct mpc_config_processor *m =
 864                                     (struct mpc_config_processor *)mpt;
 865                                 mpt += sizeof(*m);
 866                                 count += sizeof(*m);
 867                                 break;
 868                         }
 869                 case MP_BUS:
 870                         {
 871                                 struct mpc_config_bus *m =
 872                                     (struct mpc_config_bus *)mpt;
 873                                 mpt += sizeof(*m);
 874                                 count += sizeof(*m);
 875                                 break;
 876                         }
 877                 case MP_IOAPIC:
 878                         {
 879                                 mpt += sizeof(struct mpc_config_ioapic);
 880                                 count += sizeof(struct mpc_config_ioapic);
 881                                 break;
 882                         }
 883                 case MP_INTSRC:
 884                         {
 885 #ifdef CONFIG_X86_IO_APIC
 886                                 struct mpc_config_intsrc *m =
 887                                     (struct mpc_config_intsrc *)mpt;
 888
 889                                 printk(KERN_INFO "OLD ");
 890                                 print_MP_intsrc_info(m);
 891                                 i = get_MP_intsrc_index(m);
 892                                 if (i > 0) {
 893                                         assign_to_mpc_intsrc(&mp_irqs[i], m);
 894                                         printk(KERN_INFO "NEW ");
 895                                         print_mp_irq_info(&mp_irqs[i]);
 896                                 } else if (!i) {
 897                                         /* legacy, do nothing */
 898                                 } else if (nr_m_spare < SPARE_SLOT_NUM) {
 899                                         /*
 900                                          * not found (-1), or duplicated (-2)
 901                                          * are invalid entries,
 902                                          * we need to use the slot  later
 903                                          */
 904                                         m_spare[nr_m_spare] = m;
 905                                         nr_m_spare++;
 906                                 }
 907 #endif
 908                                 mpt += sizeof(struct mpc_config_intsrc);
 909                                 count += sizeof(struct mpc_config_intsrc);
 910                                 break;
 911                         }
 912                 case MP_LINTSRC:
 913                         {
 914                                 struct mpc_config_lintsrc *m =
 915                                     (struct mpc_config_lintsrc *)mpt;
 916                                 mpt += sizeof(*m);
 917                                 count += sizeof(*m);
 918                                 break;
 919                         }
 920                 default:
 921                         /* wrong mptable */
 922                         printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
 923                         printk(KERN_ERR "type %x\n", *mpt);
 924                         print_hex_dump(KERN_ERR, "  ", DUMP_PREFIX_ADDRESS, 16,
 925                                         1, mpc, mpc->mpc_length, 1);
 926                         goto out;
 927                 }
 928         }
 929
 930 #ifdef CONFIG_X86_IO_APIC
 931         for (i = 0; i < mp_irq_entries; i++) {
 932                 if (irq_used[i])
 933                         continue;
 934
 935                 if (mp_irqs[i].mp_irqtype != mp_INT)
 936                         continue;
 937
 938                 if (mp_irqs[i].mp_irqflag != 0x0f)
 939                         continue;
 940
 941                 if (nr_m_spare > 0) {
 942                         printk(KERN_INFO "*NEW* found ");
 943                         nr_m_spare--;
 944                         assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]);
 945                         m_spare[nr_m_spare] = NULL;
 946                 } else {
 947                         struct mpc_config_intsrc *m =
 948                             (struct mpc_config_intsrc *)mpt;
 949                         count += sizeof(struct mpc_config_intsrc);
 950                         if (!mpc_new_phys) {
 951                                 printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
 952                         } else {
 953                                 if (count <= mpc_new_length)
 954                                         printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
 955                                 else {
 956                                         printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
 957                                         goto out;
 958                                 }
 959                         }
 960                         assign_to_mpc_intsrc(&mp_irqs[i], m);
 961                         mpc->mpc_length = count;
 962                         mpt += sizeof(struct mpc_config_intsrc);
 963                 }
 964                 print_mp_irq_info(&mp_irqs[i]);
 965         }
 966 #endif
 967 out:
 968         /* update checksum */
 969         mpc->mpc_checksum = 0;
 970         mpc->mpc_checksum -= mpf_checksum((unsigned char *)mpc,
 971                                            mpc->mpc_length);
 972
 973         return 0;
 974 }
 975
 976 static int __initdata enable_update_mptable;
 977
 978 static int __init update_mptable_setup(char *str)
 979 {
 980         enable_update_mptable = 1;
 981         return 0;
 982 }
 983 early_param("update_mptable", update_mptable_setup);
 984
 985 static unsigned long __initdata mpc_new_phys;
 986 static unsigned long mpc_new_length __initdata = 4096;
 987
 988 /* alloc_mptable or alloc_mptable=4k */
 989 static int __initdata alloc_mptable;
 990 static int __init parse_alloc_mptable_opt(char *p)
 991 {
 992         enable_update_mptable = 1;
 993         alloc_mptable = 1;
 994         if (!p)
 995                 return 0;
 996         mpc_new_length = memparse(p, &p);
 997         return 0;
 998 }
 999 early_param("alloc_mptable", parse_alloc_mptable_opt);
1000
1001 void __init early_reserve_e820_mpc_new(void)
1002 {
1003         if (enable_update_mptable && alloc_mptable) {
1004                 u64 startt = 0;
1005 #ifdef CONFIG_X86_TRAMPOLINE
1006                 startt = TRAMPOLINE_BASE;
1007 #endif
1008                 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4);
1009         }
1010 }
1011
1012 static int __init update_mp_table(void)
1013 {
1014         char str[16];
1015         char oem[10];
1016         struct intel_mp_floating *mpf;
1017         struct mp_config_table *mpc;
1018         struct mp_config_table *mpc_new;
1019
1020         if (!enable_update_mptable)
1021                 return 0;
1022
1023         mpf = mpf_found;
1024         if (!mpf)
1025                 return 0;
1026
1027         /*
1028          * Now see if we need to go further.
1029          */
1030         if (mpf->mpf_feature1 != 0)
1031                 return 0;
1032
1033         if (!mpf->mpf_physptr)
1034                 return 0;
1035
1036         mpc = phys_to_virt(mpf->mpf_physptr);
1037
1038         if (!smp_check_mpc(mpc, oem, str))
1039                 return 0;
1040
1041         printk(KERN_INFO "mpf: %lx\n", virt_to_phys(mpf));
1042         printk(KERN_INFO "mpf_physptr: %x\n", mpf->mpf_physptr);
1043
1044         if (mpc_new_phys && mpc->mpc_length > mpc_new_length) {
1045                 mpc_new_phys = 0;
1046                 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
1047                          mpc_new_length);
1048         }
1049
1050         if (!mpc_new_phys) {
1051                 unsigned char old, new;
1052                 /* check if we can change the postion */
1053                 mpc->mpc_checksum = 0;
1054                 old = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1055                 mpc->mpc_checksum = 0xff;
1056                 new = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
1057                 if (old == new) {
1058                         printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
1059                         return 0;
1060                 }
1061                 printk(KERN_INFO "use in-positon replacing\n");
1062         } else {
1063                 mpf->mpf_physptr = mpc_new_phys;
1064                 mpc_new = phys_to_virt(mpc_new_phys);
1065                 memcpy(mpc_new, mpc, mpc->mpc_length);
1066                 mpc = mpc_new;
1067                 /* check if we can modify that */
1068                 if (mpc_new_phys - mpf->mpf_physptr) {
1069                         struct intel_mp_floating *mpf_new;
1070                         /* steal 16 bytes from [0, 1k) */
1071                         printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
1072                         mpf_new = phys_to_virt(0x400 - 16);
1073                         memcpy(mpf_new, mpf, 16);
1074                         mpf = mpf_new;
1075                         mpf->mpf_physptr = mpc_new_phys;
1076                 }
1077                 mpf->mpf_checksum = 0;
1078                 mpf->mpf_checksum -= mpf_checksum((unsigned char *)mpf, 16);
1079                 printk(KERN_INFO "mpf_physptr new: %x\n", mpf->mpf_physptr);
1080         }
1081
1082         /*
1083          * only replace the one with mp_INT and
1084          *       MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
1085          * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
1086          * may need pci=routeirq for all coverage
1087          */
1088         replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
1089
1090         return 0;
1091 }
1092
1093 late_initcall(update_mp_table);