arch/x86/kernel/mpparse.c

   1 /*
   2  *      Intel Multiprocessor Specification 1.1 and 1.4
   3  *      compliant MP-table parsing routines.
   4  *
   5  *      (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk>
   6  *      (c) 1998, 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com>
   7  *      (c) 2008 Alexey Starikovskiy <astarikovskiy@suse.de>
   8  */
   9
  10 #include <linux/mm.h>
  11 #include <linux/init.h>
  12 #include <linux/delay.h>
  13 #include <linux/bootmem.h>
  14 #include <linux/memblock.h>
  15 #include <linux/kernel_stat.h>
  16 #include <linux/mc146818rtc.h>
  17 #include <linux/bitops.h>
  18 #include <linux/acpi.h>
  19 #include <linux/module.h>
  20 #include <linux/smp.h>
  21 #include <linux/pci.h>
  22
  23 #include <asm/mtrr.h>
  24 #include <asm/mpspec.h>
  25 #include <asm/pgalloc.h>
  26 #include <asm/io_apic.h>
  27 #include <asm/proto.h>
  28 #include <asm/bios_ebda.h>
  29 #include <asm/e820.h>
  30 #include <asm/setup.h>
  31 #include <asm/smp.h>
  32
  33 #include <asm/apic.h>
  34 /*
  35  * Checksum an MP configuration block.
  36  */
  37
  38 static int __init mpf_checksum(unsigned char *mp, int len)
  39 {
  40         int sum = 0;
  41
  42         while (len--)
  43                 sum += *mp++;
  44
  45         return sum & 0xFF;
  46 }
  47
  48 int __init default_mpc_apic_id(struct mpc_cpu *m)
  49 {
  50         return m->apicid;
  51 }
  52
  53 static void __init MP_processor_info(struct mpc_cpu *m)
  54 {
  55         int apicid;
  56         char *bootup_cpu = "";
  57
  58         if (!(m->cpuflag & CPU_ENABLED)) {
  59                 disabled_cpus++;
  60                 return;
  61         }
  62
  63         apicid = x86_init.mpparse.mpc_apic_id(m);
  64
  65         if (m->cpuflag & CPU_BOOTPROCESSOR) {
  66                 bootup_cpu = " (Bootup-CPU)";
  67                 boot_cpu_physical_apicid = m->apicid;
  68         }
  69
  70         printk(KERN_INFO "Processor #%d%s\n", m->apicid, bootup_cpu);
  71         generic_processor_info(apicid, m->apicver);
  72 }
  73
  74 #ifdef CONFIG_X86_IO_APIC
  75 void __init default_mpc_oem_bus_info(struct mpc_bus *m, char *str)
  76 {
  77         memcpy(str, m->bustype, 6);
  78         str[6] = 0;
  79         apic_printk(APIC_VERBOSE, "Bus #%d is %s\n", m->busid, str);
  80 }
  81
  82 static void __init MP_bus_info(struct mpc_bus *m)
  83 {
  84         char str[7];
  85
  86         x86_init.mpparse.mpc_oem_bus_info(m, str);
  87
  88 #if MAX_MP_BUSSES < 256
  89         if (m->busid >= MAX_MP_BUSSES) {
  90                 printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
  91                        " is too large, max. supported is %d\n",
  92                        m->busid, str, MAX_MP_BUSSES - 1);
  93                 return;
  94         }
  95 #endif
  96
  97         set_bit(m->busid, mp_bus_not_pci);
  98         if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) {
  99 #ifdef CONFIG_EISA
 100                 mp_bus_id_to_type[m->busid] = MP_BUS_ISA;
 101 #endif
 102         } else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI) - 1) == 0) {
 103                 if (x86_init.mpparse.mpc_oem_pci_bus)
 104                         x86_init.mpparse.mpc_oem_pci_bus(m);
 105
 106                 clear_bit(m->busid, mp_bus_not_pci);
 107 #ifdef CONFIG_EISA
 108                 mp_bus_id_to_type[m->busid] = MP_BUS_PCI;
 109         } else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA) - 1) == 0) {
 110                 mp_bus_id_to_type[m->busid] = MP_BUS_EISA;
 111 #endif
 112         } else
 113                 printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
 114 }
 115
 116 static void __init MP_ioapic_info(struct mpc_ioapic *m)
 117 {
 118         if (m->flags & MPC_APIC_USABLE)
 119                 mp_register_ioapic(m->apicid, m->apicaddr, gsi_top);
 120 }
 121
 122 static void __init print_mp_irq_info(struct mpc_intsrc *mp_irq)
 123 {
 124         apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
 125                 " IRQ %02x, APIC ID %x, APIC INT %02x\n",
 126                 mp_irq->irqtype, mp_irq->irqflag & 3,
 127                 (mp_irq->irqflag >> 2) & 3, mp_irq->srcbus,
 128                 mp_irq->srcbusirq, mp_irq->dstapic, mp_irq->dstirq);
 129 }
 130
 131 #else /* CONFIG_X86_IO_APIC */
 132 static inline void __init MP_bus_info(struct mpc_bus *m) {}
 133 static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
 134 #endif /* CONFIG_X86_IO_APIC */
 135
 136 static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
 137 {
 138         apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x,"
 139                 " IRQ %02x, APIC ID %x, APIC LINT %02x\n",
 140                 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid,
 141                 m->srcbusirq, m->destapic, m->destapiclint);
 142 }
 143
 144 /*
 145  * Read/parse the MPC
 146  */
 147 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
 148 {
 149
 150         if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) {
 151                 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
 152                        mpc->signature[0], mpc->signature[1],
 153                        mpc->signature[2], mpc->signature[3]);
 154                 return 0;
 155         }
 156         if (mpf_checksum((unsigned char *)mpc, mpc->length)) {
 157                 printk(KERN_ERR "MPTABLE: checksum error!\n");
 158                 return 0;
 159         }
 160         if (mpc->spec != 0x01 && mpc->spec != 0x04) {
 161                 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n",
 162                        mpc->spec);
 163                 return 0;
 164         }
 165         if (!mpc->lapic) {
 166                 printk(KERN_ERR "MPTABLE: null local APIC address!\n");
 167                 return 0;
 168         }
 169         memcpy(oem, mpc->oem, 8);
 170         oem[8] = 0;
 171         printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem);
 172
 173         memcpy(str, mpc->productid, 12);
 174         str[12] = 0;
 175
 176         printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
 177
 178         printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic);
 179
 180         return 1;
 181 }
 182
 183 static void skip_entry(unsigned char **ptr, int *count, int size)
 184 {
 185         *ptr += size;
 186         *count += size;
 187 }
 188
 189 static void __init smp_dump_mptable(struct mpc_table *mpc, unsigned char *mpt)
 190 {
 191         printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n"
 192                 "type %x\n", *mpt);
 193         print_hex_dump(KERN_ERR, "  ", DUMP_PREFIX_ADDRESS, 16,
 194                         1, mpc, mpc->length, 1);
 195 }
 196
 197 void __init default_smp_read_mpc_oem(struct mpc_table *mpc) { }
 198
 199 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
 200 {
 201         char str[16];
 202         char oem[10];
 203
 204         int count = sizeof(*mpc);
 205         unsigned char *mpt = ((unsigned char *)mpc) + count;
 206
 207         if (!smp_check_mpc(mpc, oem, str))
 208                 return 0;
 209
 210 #ifdef CONFIG_X86_32
 211         generic_mps_oem_check(mpc, oem, str);
 212 #endif
 213         /* Initialize the lapic mapping */
 214         if (!acpi_lapic)
 215                 register_lapic_address(mpc->lapic);
 216
 217         if (early)
 218                 return 1;
 219
 220         if (mpc->oemptr)
 221                 x86_init.mpparse.smp_read_mpc_oem(mpc);
 222
 223         /*
 224          *      Now process the configuration blocks.
 225          */
 226         x86_init.mpparse.mpc_record(0);
 227
 228         while (count < mpc->length) {
 229                 switch (*mpt) {
 230                 case MP_PROCESSOR:
 231                         /* ACPI may have already provided this data */
 232                         if (!acpi_lapic)
 233                                 MP_processor_info((struct mpc_cpu *)mpt);
 234                         skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
 235                         break;
 236                 case MP_BUS:
 237                         MP_bus_info((struct mpc_bus *)mpt);
 238                         skip_entry(&mpt, &count, sizeof(struct mpc_bus));
 239                         break;
 240                 case MP_IOAPIC:
 241                         MP_ioapic_info((struct mpc_ioapic *)mpt);
 242                         skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
 243                         break;
 244                 case MP_INTSRC:
 245                         mp_save_irq((struct mpc_intsrc *)mpt);
 246                         skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
 247                         break;
 248                 case MP_LINTSRC:
 249                         MP_lintsrc_info((struct mpc_lintsrc *)mpt);
 250                         skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
 251                         break;
 252                 default:
 253                         /* wrong mptable */
 254                         smp_dump_mptable(mpc, mpt);
 255                         count = mpc->length;
 256                         break;
 257                 }
 258                 x86_init.mpparse.mpc_record(1);
 259         }
 260
 261         if (!num_processors)
 262                 printk(KERN_ERR "MPTABLE: no processors registered!\n");
 263         return num_processors;
 264 }
 265
 266 #ifdef CONFIG_X86_IO_APIC
 267
 268 static int __init ELCR_trigger(unsigned int irq)
 269 {
 270         unsigned int port;
 271
 272         port = 0x4d0 + (irq >> 3);
 273         return (inb(port) >> (irq & 7)) & 1;
 274 }
 275
 276 static void __init construct_default_ioirq_mptable(int mpc_default_type)
 277 {
 278         struct mpc_intsrc intsrc;
 279         int i;
 280         int ELCR_fallback = 0;
 281
 282         intsrc.type = MP_INTSRC;
 283         intsrc.irqflag = 0;     /* conforming */
 284         intsrc.srcbus = 0;
 285         intsrc.dstapic = mpc_ioapic_id(0);
 286
 287         intsrc.irqtype = mp_INT;
 288
 289         /*
 290          *  If true, we have an ISA/PCI system with no IRQ entries
 291          *  in the MP table. To prevent the PCI interrupts from being set up
 292          *  incorrectly, we try to use the ELCR. The sanity check to see if
 293          *  there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
 294          *  never be level sensitive, so we simply see if the ELCR agrees.
 295          *  If it does, we assume it's valid.
 296          */
 297         if (mpc_default_type == 5) {
 298                 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... "
 299                        "falling back to ELCR\n");
 300
 301                 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) ||
 302                     ELCR_trigger(13))
 303                         printk(KERN_ERR "ELCR contains invalid data... "
 304                                "not using ELCR\n");
 305                 else {
 306                         printk(KERN_INFO
 307                                "Using ELCR to identify PCI interrupts\n");
 308                         ELCR_fallback = 1;
 309                 }
 310         }
 311
 312         for (i = 0; i < 16; i++) {
 313                 switch (mpc_default_type) {
 314                 case 2:
 315                         if (i == 0 || i == 13)
 316                                 continue;       /* IRQ0 & IRQ13 not connected */
 317                         /* fall through */
 318                 default:
 319                         if (i == 2)
 320                                 continue;       /* IRQ2 is never connected */
 321                 }
 322
 323                 if (ELCR_fallback) {
 324                         /*
 325                          *  If the ELCR indicates a level-sensitive interrupt, we
 326                          *  copy that information over to the MP table in the
 327                          *  irqflag field (level sensitive, active high polarity).
 328                          */
 329                         if (ELCR_trigger(i))
 330                                 intsrc.irqflag = 13;
 331                         else
 332                                 intsrc.irqflag = 0;
 333                 }
 334
 335                 intsrc.srcbusirq = i;
 336                 intsrc.dstirq = i ? i : 2;      /* IRQ0 to INTIN2 */
 337                 mp_save_irq(&intsrc);
 338         }
 339
 340         intsrc.irqtype = mp_ExtINT;
 341         intsrc.srcbusirq = 0;
 342         intsrc.dstirq = 0;      /* 8259A to INTIN0 */
 343         mp_save_irq(&intsrc);
 344 }
 345
 346
 347 static void __init construct_ioapic_table(int mpc_default_type)
 348 {
 349         struct mpc_ioapic ioapic;
 350         struct mpc_bus bus;
 351
 352         bus.type = MP_BUS;
 353         bus.busid = 0;
 354         switch (mpc_default_type) {
 355         default:
 356                 printk(KERN_ERR "???\nUnknown standard configuration %d\n",
 357                        mpc_default_type);
 358                 /* fall through */
 359         case 1:
 360         case 5:
 361                 memcpy(bus.bustype, "ISA   ", 6);
 362                 break;
 363         case 2:
 364         case 6:
 365         case 3:
 366                 memcpy(bus.bustype, "EISA  ", 6);
 367                 break;
 368         }
 369         MP_bus_info(&bus);
 370         if (mpc_default_type > 4) {
 371                 bus.busid = 1;
 372                 memcpy(bus.bustype, "PCI   ", 6);
 373                 MP_bus_info(&bus);
 374         }
 375
 376         ioapic.type     = MP_IOAPIC;
 377         ioapic.apicid   = 2;
 378         ioapic.apicver  = mpc_default_type > 4 ? 0x10 : 0x01;
 379         ioapic.flags    = MPC_APIC_USABLE;
 380         ioapic.apicaddr = IO_APIC_DEFAULT_PHYS_BASE;
 381         MP_ioapic_info(&ioapic);
 382
 383         /*
 384          * We set up most of the low 16 IO-APIC pins according to MPS rules.
 385          */
 386         construct_default_ioirq_mptable(mpc_default_type);
 387 }
 388 #else
 389 static inline void __init construct_ioapic_table(int mpc_default_type) { }
 390 #endif
 391
 392 static inline void __init construct_default_ISA_mptable(int mpc_default_type)
 393 {
 394         struct mpc_cpu processor;
 395         struct mpc_lintsrc lintsrc;
 396         int linttypes[2] = { mp_ExtINT, mp_NMI };
 397         int i;
 398
 399         /*
 400          * local APIC has default address
 401          */
 402         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 403
 404         /*
 405          * 2 CPUs, numbered 0 & 1.
 406          */
 407         processor.type = MP_PROCESSOR;
 408         /* Either an integrated APIC or a discrete 82489DX. */
 409         processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01;
 410         processor.cpuflag = CPU_ENABLED;
 411         processor.cpufeature = (boot_cpu_data.x86 << 8) |
 412             (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
 413         processor.featureflag = boot_cpu_data.x86_capability[0];
 414         processor.reserved[0] = 0;
 415         processor.reserved[1] = 0;
 416         for (i = 0; i < 2; i++) {
 417                 processor.apicid = i;
 418                 MP_processor_info(&processor);
 419         }
 420
 421         construct_ioapic_table(mpc_default_type);
 422
 423         lintsrc.type = MP_LINTSRC;
 424         lintsrc.irqflag = 0;            /* conforming */
 425         lintsrc.srcbusid = 0;
 426         lintsrc.srcbusirq = 0;
 427         lintsrc.destapic = MP_APIC_ALL;
 428         for (i = 0; i < 2; i++) {
 429                 lintsrc.irqtype = linttypes[i];
 430                 lintsrc.destapiclint = i;
 431                 MP_lintsrc_info(&lintsrc);
 432         }
 433 }
 434
 435 static struct mpf_intel *mpf_found;
 436
 437 static unsigned long __init get_mpc_size(unsigned long physptr)
 438 {
 439         struct mpc_table *mpc;
 440         unsigned long size;
 441
 442         mpc = early_ioremap(physptr, PAGE_SIZE);
 443         size = mpc->length;
 444         early_iounmap(mpc, PAGE_SIZE);
 445         apic_printk(APIC_VERBOSE, "  mpc: %lx-%lx\n", physptr, physptr + size);
 446
 447         return size;
 448 }
 449
 450 static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
 451 {
 452         struct mpc_table *mpc;
 453         unsigned long size;
 454
 455         size = get_mpc_size(mpf->physptr);
 456         mpc = early_ioremap(mpf->physptr, size);
 457         /*
 458          * Read the physical hardware table.  Anything here will
 459          * override the defaults.
 460          */
 461         if (!smp_read_mpc(mpc, early)) {
 462 #ifdef CONFIG_X86_LOCAL_APIC
 463                 smp_found_config = 0;
 464 #endif
 465                 printk(KERN_ERR "BIOS bug, MP table errors detected!...\n"
 466                         "... disabling SMP support. (tell your hw vendor)\n");
 467                 early_iounmap(mpc, size);
 468                 return -1;
 469         }
 470         early_iounmap(mpc, size);
 471
 472         if (early)
 473                 return -1;
 474
 475 #ifdef CONFIG_X86_IO_APIC
 476         /*
 477          * If there are no explicit MP IRQ entries, then we are
 478          * broken.  We set up most of the low 16 IO-APIC pins to
 479          * ISA defaults and hope it will work.
 480          */
 481         if (!mp_irq_entries) {
 482                 struct mpc_bus bus;
 483
 484                 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, "
 485                        "using default mptable. (tell your hw vendor)\n");
 486
 487                 bus.type = MP_BUS;
 488                 bus.busid = 0;
 489                 memcpy(bus.bustype, "ISA   ", 6);
 490                 MP_bus_info(&bus);
 491
 492                 construct_default_ioirq_mptable(0);
 493         }
 494 #endif
 495
 496         return 0;
 497 }
 498
 499 /*
 500  * Scan the memory blocks for an SMP configuration block.
 501  */
 502 void __init default_get_smp_config(unsigned int early)
 503 {
 504         struct mpf_intel *mpf = mpf_found;
 505
 506         if (!mpf)
 507                 return;
 508
 509         if (acpi_lapic && early)
 510                 return;
 511
 512         /*
 513          * MPS doesn't support hyperthreading, aka only have
 514          * thread 0 apic id in MPS table
 515          */
 516         if (acpi_lapic && acpi_ioapic)
 517                 return;
 518
 519         printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
 520                mpf->specification);
 521 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
 522         if (mpf->feature2 & (1 << 7)) {
 523                 printk(KERN_INFO "    IMCR and PIC compatibility mode.\n");
 524                 pic_mode = 1;
 525         } else {
 526                 printk(KERN_INFO "    Virtual Wire compatibility mode.\n");
 527                 pic_mode = 0;
 528         }
 529 #endif
 530         /*
 531          * Now see if we need to read further.
 532          */
 533         if (mpf->feature1 != 0) {
 534                 if (early) {
 535                         /*
 536                          * local APIC has default address
 537                          */
 538                         mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 539                         return;
 540                 }
 541
 542                 printk(KERN_INFO "Default MP configuration #%d\n",
 543                        mpf->feature1);
 544                 construct_default_ISA_mptable(mpf->feature1);
 545
 546         } else if (mpf->physptr) {
 547                 if (check_physptr(mpf, early))
 548                         return;
 549         } else
 550                 BUG();
 551
 552         if (!early)
 553                 printk(KERN_INFO "Processors: %d\n", num_processors);
 554         /*
 555          * Only use the first configuration found.
 556          */
 557 }
 558
 559 static void __init smp_reserve_memory(struct mpf_intel *mpf)
 560 {
 561         memblock_reserve(mpf->physptr, get_mpc_size(mpf->physptr));
 562 }
 563
 564 static int __init smp_scan_config(unsigned long base, unsigned long length)
 565 {
 566         unsigned int *bp = phys_to_virt(base);
 567         struct mpf_intel *mpf;
 568         unsigned long mem;
 569
 570         apic_printk(APIC_VERBOSE, "Scan for SMP in [mem %#010lx-%#010lx]\n",
 571                     base, base + length - 1);
 572         BUILD_BUG_ON(sizeof(*mpf) != 16);
 573
 574         while (length > 0) {
 575                 mpf = (struct mpf_intel *)bp;
 576                 if ((*bp == SMP_MAGIC_IDENT) &&
 577                     (mpf->length == 1) &&
 578                     !mpf_checksum((unsigned char *)bp, 16) &&
 579                     ((mpf->specification == 1)
 580                      || (mpf->specification == 4))) {
 581 #ifdef CONFIG_X86_LOCAL_APIC
 582                         smp_found_config = 1;
 583 #endif
 584                         mpf_found = mpf;
 585
 586                         printk(KERN_INFO "found SMP MP-table at [mem %#010llx-%#010llx] mapped at [%p]\n",
 587                                (unsigned long long) virt_to_phys(mpf),
 588                                (unsigned long long) virt_to_phys(mpf) +
 589                                sizeof(*mpf) - 1, mpf);
 590
 591                         mem = virt_to_phys(mpf);
 592                         memblock_reserve(mem, sizeof(*mpf));
 593                         if (mpf->physptr)
 594                                 smp_reserve_memory(mpf);
 595
 596                         return 1;
 597                 }
 598                 bp += 4;
 599                 length -= 16;
 600         }
 601         return 0;
 602 }
 603
 604 void __init default_find_smp_config(void)
 605 {
 606         unsigned int address;
 607
 608         /*
 609          * FIXME: Linux assumes you have 640K of base ram..
 610          * this continues the error...
 611          *
 612          * 1) Scan the bottom 1K for a signature
 613          * 2) Scan the top 1K of base RAM
 614          * 3) Scan the 64K of bios
 615          */
 616         if (smp_scan_config(0x0, 0x400) ||
 617             smp_scan_config(639 * 0x400, 0x400) ||
 618             smp_scan_config(0xF0000, 0x10000))
 619                 return;
 620         /*
 621          * If it is an SMP machine we should know now, unless the
 622          * configuration is in an EISA bus machine with an
 623          * extended bios data area.
 624          *
 625          * there is a real-mode segmented pointer pointing to the
 626          * 4K EBDA area at 0x40E, calculate and scan it here.
 627          *
 628          * NOTE! There are Linux loaders that will corrupt the EBDA
 629          * area, and as such this kind of SMP config may be less
 630          * trustworthy, simply because the SMP table may have been
 631          * stomped on during early boot. These loaders are buggy and
 632          * should be fixed.
 633          *
 634          * MP1.4 SPEC states to only scan first 1K of 4K EBDA.
 635          */
 636
 637         address = get_bios_ebda();
 638         if (address)
 639                 smp_scan_config(address, 0x400);
 640 }
 641
 642 #ifdef CONFIG_X86_IO_APIC
 643 static u8 __initdata irq_used[MAX_IRQ_SOURCES];
 644
 645 static int  __init get_MP_intsrc_index(struct mpc_intsrc *m)
 646 {
 647         int i;
 648
 649         if (m->irqtype != mp_INT)
 650                 return 0;
 651
 652         if (m->irqflag != 0x0f)
 653                 return 0;
 654
 655         /* not legacy */
 656
 657         for (i = 0; i < mp_irq_entries; i++) {
 658                 if (mp_irqs[i].irqtype != mp_INT)
 659                         continue;
 660
 661                 if (mp_irqs[i].irqflag != 0x0f)
 662                         continue;
 663
 664                 if (mp_irqs[i].srcbus != m->srcbus)
 665                         continue;
 666                 if (mp_irqs[i].srcbusirq != m->srcbusirq)
 667                         continue;
 668                 if (irq_used[i]) {
 669                         /* already claimed */
 670                         return -2;
 671                 }
 672                 irq_used[i] = 1;
 673                 return i;
 674         }
 675
 676         /* not found */
 677         return -1;
 678 }
 679
 680 #define SPARE_SLOT_NUM 20
 681
 682 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
 683
 684 static void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
 685 {
 686         int i;
 687
 688         apic_printk(APIC_VERBOSE, "OLD ");
 689         print_mp_irq_info(m);
 690
 691         i = get_MP_intsrc_index(m);
 692         if (i > 0) {
 693                 memcpy(m, &mp_irqs[i], sizeof(*m));
 694                 apic_printk(APIC_VERBOSE, "NEW ");
 695                 print_mp_irq_info(&mp_irqs[i]);
 696                 return;
 697         }
 698         if (!i) {
 699                 /* legacy, do nothing */
 700                 return;
 701         }
 702         if (*nr_m_spare < SPARE_SLOT_NUM) {
 703                 /*
 704                  * not found (-1), or duplicated (-2) are invalid entries,
 705                  * we need to use the slot later
 706                  */
 707                 m_spare[*nr_m_spare] = m;
 708                 *nr_m_spare += 1;
 709         }
 710 }
 711
 712 static int __init
 713 check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length, int count)
 714 {
 715         if (!mpc_new_phys || count <= mpc_new_length) {
 716                 WARN(1, "update_mptable: No spare slots (length: %x)\n", count);
 717                 return -1;
 718         }
 719
 720         return 0;
 721 }
 722 #else /* CONFIG_X86_IO_APIC */
 723 static
 724 inline void __init check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {}
 725 #endif /* CONFIG_X86_IO_APIC */
 726
 727 static int  __init replace_intsrc_all(struct mpc_table *mpc,
 728                                         unsigned long mpc_new_phys,
 729                                         unsigned long mpc_new_length)
 730 {
 731 #ifdef CONFIG_X86_IO_APIC
 732         int i;
 733 #endif
 734         int count = sizeof(*mpc);
 735         int nr_m_spare = 0;
 736         unsigned char *mpt = ((unsigned char *)mpc) + count;
 737
 738         printk(KERN_INFO "mpc_length %x\n", mpc->length);
 739         while (count < mpc->length) {
 740                 switch (*mpt) {
 741                 case MP_PROCESSOR:
 742                         skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
 743                         break;
 744                 case MP_BUS:
 745                         skip_entry(&mpt, &count, sizeof(struct mpc_bus));
 746                         break;
 747                 case MP_IOAPIC:
 748                         skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
 749                         break;
 750                 case MP_INTSRC:
 751                         check_irq_src((struct mpc_intsrc *)mpt, &nr_m_spare);
 752                         skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
 753                         break;
 754                 case MP_LINTSRC:
 755                         skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
 756                         break;
 757                 default:
 758                         /* wrong mptable */
 759                         smp_dump_mptable(mpc, mpt);
 760                         goto out;
 761                 }
 762         }
 763
 764 #ifdef CONFIG_X86_IO_APIC
 765         for (i = 0; i < mp_irq_entries; i++) {
 766                 if (irq_used[i])
 767                         continue;
 768
 769                 if (mp_irqs[i].irqtype != mp_INT)
 770                         continue;
 771
 772                 if (mp_irqs[i].irqflag != 0x0f)
 773                         continue;
 774
 775                 if (nr_m_spare > 0) {
 776                         apic_printk(APIC_VERBOSE, "*NEW* found\n");
 777                         nr_m_spare--;
 778                         memcpy(m_spare[nr_m_spare], &mp_irqs[i], sizeof(mp_irqs[i]));
 779                         m_spare[nr_m_spare] = NULL;
 780                 } else {
 781                         struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
 782                         count += sizeof(struct mpc_intsrc);
 783                         if (check_slot(mpc_new_phys, mpc_new_length, count) < 0)
 784                                 goto out;
 785                         memcpy(m, &mp_irqs[i], sizeof(*m));
 786                         mpc->length = count;
 787                         mpt += sizeof(struct mpc_intsrc);
 788                 }
 789                 print_mp_irq_info(&mp_irqs[i]);
 790         }
 791 #endif
 792 out:
 793         /* update checksum */
 794         mpc->checksum = 0;
 795         mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length);
 796
 797         return 0;
 798 }
 799
 800 int enable_update_mptable;
 801
 802 static int __init update_mptable_setup(char *str)
 803 {
 804         enable_update_mptable = 1;
 805 #ifdef CONFIG_PCI
 806         pci_routeirq = 1;
 807 #endif
 808         return 0;
 809 }
 810 early_param("update_mptable", update_mptable_setup);
 811
 812 static unsigned long __initdata mpc_new_phys;
 813 static unsigned long mpc_new_length __initdata = 4096;
 814
 815 /* alloc_mptable or alloc_mptable=4k */
 816 static int __initdata alloc_mptable;
 817 static int __init parse_alloc_mptable_opt(char *p)
 818 {
 819         enable_update_mptable = 1;
 820 #ifdef CONFIG_PCI
 821         pci_routeirq = 1;
 822 #endif
 823         alloc_mptable = 1;
 824         if (!p)
 825                 return 0;
 826         mpc_new_length = memparse(p, &p);
 827         return 0;
 828 }
 829 early_param("alloc_mptable", parse_alloc_mptable_opt);
 830
 831 void __init early_reserve_e820_mpc_new(void)
 832 {
 833         if (enable_update_mptable && alloc_mptable)
 834                 mpc_new_phys = early_reserve_e820(mpc_new_length, 4);
 835 }
 836
 837 static int __init update_mp_table(void)
 838 {
 839         char str[16];
 840         char oem[10];
 841         struct mpf_intel *mpf;
 842         struct mpc_table *mpc, *mpc_new;
 843
 844         if (!enable_update_mptable)
 845                 return 0;
 846
 847         mpf = mpf_found;
 848         if (!mpf)
 849                 return 0;
 850
 851         /*
 852          * Now see if we need to go further.
 853          */
 854         if (mpf->feature1 != 0)
 855                 return 0;
 856
 857         if (!mpf->physptr)
 858                 return 0;
 859
 860         mpc = phys_to_virt(mpf->physptr);
 861
 862         if (!smp_check_mpc(mpc, oem, str))
 863                 return 0;
 864
 865         printk(KERN_INFO "mpf: %llx\n", (u64)virt_to_phys(mpf));
 866         printk(KERN_INFO "physptr: %x\n", mpf->physptr);
 867
 868         if (mpc_new_phys && mpc->length > mpc_new_length) {
 869                 mpc_new_phys = 0;
 870                 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
 871                          mpc_new_length);
 872         }
 873
 874         if (!mpc_new_phys) {
 875                 unsigned char old, new;
 876                 /* check if we can change the position */
 877                 mpc->checksum = 0;
 878                 old = mpf_checksum((unsigned char *)mpc, mpc->length);
 879                 mpc->checksum = 0xff;
 880                 new = mpf_checksum((unsigned char *)mpc, mpc->length);
 881                 if (old == new) {
 882                         printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
 883                         return 0;
 884                 }
 885                 printk(KERN_INFO "use in-position replacing\n");
 886         } else {
 887                 mpf->physptr = mpc_new_phys;
 888                 mpc_new = phys_to_virt(mpc_new_phys);
 889                 memcpy(mpc_new, mpc, mpc->length);
 890                 mpc = mpc_new;
 891                 /* check if we can modify that */
 892                 if (mpc_new_phys - mpf->physptr) {
 893                         struct mpf_intel *mpf_new;
 894                         /* steal 16 bytes from [0, 1k) */
 895                         printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
 896                         mpf_new = phys_to_virt(0x400 - 16);
 897                         memcpy(mpf_new, mpf, 16);
 898                         mpf = mpf_new;
 899                         mpf->physptr = mpc_new_phys;
 900                 }
 901                 mpf->checksum = 0;
 902                 mpf->checksum -= mpf_checksum((unsigned char *)mpf, 16);
 903                 printk(KERN_INFO "physptr new: %x\n", mpf->physptr);
 904         }
 905
 906         /*
 907          * only replace the one with mp_INT and
 908          *       MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
 909          * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
 910          * may need pci=routeirq for all coverage
 911          */
 912         replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
 913
 914         return 0;
 915 }
 916
 917 late_initcall(update_mp_table);