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 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 #include <linux/smp.h> 20 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/bios_ebda.h> 27 #include <asm/e820.h> 28 #include <asm/trampoline.h> 29 #include <asm/setup.h> 30 #include <asm/smp.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_cpu *m) 53 { 54 int apicid; 55 char *bootup_cpu = ""; 56 57 if (!(m->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->apicid; 66 67 if (m->cpuflag & CPU_BOOTPROCESSOR) { 68 bootup_cpu = " (Bootup-CPU)"; 69 boot_cpu_physical_apicid = m->apicid; 70 } 71 72 printk(KERN_INFO "Processor #%d%s\n", m->apicid, bootup_cpu); 73 generic_processor_info(apicid, m->apicver); 74 } 75 76 #ifdef CONFIG_X86_IO_APIC 77 static void __init MP_bus_info(struct mpc_bus *m) 78 { 79 char str[7]; 80 memcpy(str, m->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->busid, 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 if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA) - 1) == 0) { 98 set_bit(m->busid, mp_bus_not_pci); 99 #if defined(CONFIG_EISA) || defined(CONFIG_MCA) 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_quirks->mpc_oem_pci_bus) 104 x86_quirks->mpc_oem_pci_bus(m); 105 106 clear_bit(m->busid, mp_bus_not_pci); 107 #if defined(CONFIG_EISA) || defined(CONFIG_MCA) 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 } else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA) - 1) == 0) { 112 mp_bus_id_to_type[m->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_ioapic *m) 137 { 138 if (!(m->flags & MPC_APIC_USABLE)) 139 return; 140 141 printk(KERN_INFO "I/O APIC #%d Version %d at 0x%X.\n", 142 m->apicid, m->apicver, m->apicaddr); 143 144 if (bad_ioapic(m->apicaddr)) 145 return; 146 147 mp_ioapics[nr_ioapics].mp_apicaddr = m->apicaddr; 148 mp_ioapics[nr_ioapics].mp_apicid = m->apicid; 149 mp_ioapics[nr_ioapics].mp_type = m->type; 150 mp_ioapics[nr_ioapics].mp_apicver = m->apicver; 151 mp_ioapics[nr_ioapics].mp_flags = m->flags; 152 nr_ioapics++; 153 } 154 155 static void print_MP_intsrc_info(struct mpc_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->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus, 160 m->srcbusirq, m->dstapic, m->dstirq); 161 } 162 163 static void __init print_mp_irq_info(struct mp_config_intsrc *mp_irq) 164 { 165 apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x," 166 " IRQ %02x, APIC ID %x, APIC INT %02x\n", 167 mp_irq->mp_irqtype, mp_irq->mp_irqflag & 3, 168 (mp_irq->mp_irqflag >> 2) & 3, mp_irq->mp_srcbus, 169 mp_irq->mp_srcbusirq, mp_irq->mp_dstapic, mp_irq->mp_dstirq); 170 } 171 172 static void __init assign_to_mp_irq(struct mpc_intsrc *m, 173 struct mp_config_intsrc *mp_irq) 174 { 175 mp_irq->mp_dstapic = m->dstapic; 176 mp_irq->mp_type = m->type; 177 mp_irq->mp_irqtype = m->irqtype; 178 mp_irq->mp_irqflag = m->irqflag; 179 mp_irq->mp_srcbus = m->srcbus; 180 mp_irq->mp_srcbusirq = m->srcbusirq; 181 mp_irq->mp_dstirq = m->dstirq; 182 } 183 184 static void __init assign_to_mpc_intsrc(struct mp_config_intsrc *mp_irq, 185 struct mpc_intsrc *m) 186 { 187 m->dstapic = mp_irq->mp_dstapic; 188 m->type = mp_irq->mp_type; 189 m->irqtype = mp_irq->mp_irqtype; 190 m->irqflag = mp_irq->mp_irqflag; 191 m->srcbus = mp_irq->mp_srcbus; 192 m->srcbusirq = mp_irq->mp_srcbusirq; 193 m->dstirq = mp_irq->mp_dstirq; 194 } 195 196 static int __init mp_irq_mpc_intsrc_cmp(struct mp_config_intsrc *mp_irq, 197 struct mpc_intsrc *m) 198 { 199 if (mp_irq->mp_dstapic != m->dstapic) 200 return 1; 201 if (mp_irq->mp_type != m->type) 202 return 2; 203 if (mp_irq->mp_irqtype != m->irqtype) 204 return 3; 205 if (mp_irq->mp_irqflag != m->irqflag) 206 return 4; 207 if (mp_irq->mp_srcbus != m->srcbus) 208 return 5; 209 if (mp_irq->mp_srcbusirq != m->srcbusirq) 210 return 6; 211 if (mp_irq->mp_dstirq != m->dstirq) 212 return 7; 213 214 return 0; 215 } 216 217 static void __init MP_intsrc_info(struct mpc_intsrc *m) 218 { 219 int i; 220 221 print_MP_intsrc_info(m); 222 223 for (i = 0; i < mp_irq_entries; i++) { 224 if (!mp_irq_mpc_intsrc_cmp(&mp_irqs[i], m)) 225 return; 226 } 227 228 assign_to_mp_irq(m, &mp_irqs[mp_irq_entries]); 229 if (++mp_irq_entries == MAX_IRQ_SOURCES) 230 panic("Max # of irq sources exceeded!!\n"); 231 } 232 233 #endif 234 235 static void __init MP_lintsrc_info(struct mpc_lintsrc *m) 236 { 237 apic_printk(APIC_VERBOSE, "Lint: type %d, pol %d, trig %d, bus %02x," 238 " IRQ %02x, APIC ID %x, APIC LINT %02x\n", 239 m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbusid, 240 m->srcbusirq, m->destapic, m->destapiclint); 241 } 242 243 /* 244 * Read/parse the MPC 245 */ 246 247 static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str) 248 { 249 250 if (memcmp(mpc->signature, MPC_SIGNATURE, 4)) { 251 printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n", 252 mpc->signature[0], mpc->signature[1], 253 mpc->signature[2], mpc->signature[3]); 254 return 0; 255 } 256 if (mpf_checksum((unsigned char *)mpc, mpc->length)) { 257 printk(KERN_ERR "MPTABLE: checksum error!\n"); 258 return 0; 259 } 260 if (mpc->spec != 0x01 && mpc->spec != 0x04) { 261 printk(KERN_ERR "MPTABLE: bad table version (%d)!!\n", 262 mpc->spec); 263 return 0; 264 } 265 if (!mpc->lapic) { 266 printk(KERN_ERR "MPTABLE: null local APIC address!\n"); 267 return 0; 268 } 269 memcpy(oem, mpc->oem, 8); 270 oem[8] = 0; 271 printk(KERN_INFO "MPTABLE: OEM ID: %s\n", oem); 272 273 memcpy(str, mpc->productid, 12); 274 str[12] = 0; 275 276 printk(KERN_INFO "MPTABLE: Product ID: %s\n", str); 277 278 printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->lapic); 279 280 return 1; 281 } 282 283 static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early) 284 { 285 char str[16]; 286 char oem[10]; 287 288 int count = sizeof(*mpc); 289 unsigned char *mpt = ((unsigned char *)mpc) + count; 290 291 if (!smp_check_mpc(mpc, oem, str)) 292 return 0; 293 294 #ifdef CONFIG_X86_32 295 /* 296 * need to make sure summit and es7000's mps_oem_check is safe to be 297 * called early via genericarch 's mps_oem_check 298 */ 299 if (early) { 300 #ifdef CONFIG_X86_NUMAQ 301 numaq_mps_oem_check(mpc, oem, str); 302 #endif 303 } else 304 mps_oem_check(mpc, oem, str); 305 #endif 306 /* save the local APIC address, it might be non-default */ 307 if (!acpi_lapic) 308 mp_lapic_addr = mpc->lapic; 309 310 if (early) 311 return 1; 312 313 if (mpc->oemptr && x86_quirks->smp_read_mpc_oem) { 314 struct mpc_oemtable *oem_table = (void *)(long)mpc->oemptr; 315 x86_quirks->smp_read_mpc_oem(oem_table, mpc->oemsize); 316 } 317 318 /* 319 * Now process the configuration blocks. 320 */ 321 if (x86_quirks->mpc_record) 322 *x86_quirks->mpc_record = 0; 323 324 while (count < mpc->length) { 325 switch (*mpt) { 326 case MP_PROCESSOR: 327 { 328 struct mpc_cpu *m = (struct mpc_cpu *)mpt; 329 /* ACPI may have already provided this data */ 330 if (!acpi_lapic) 331 MP_processor_info(m); 332 mpt += sizeof(*m); 333 count += sizeof(*m); 334 break; 335 } 336 case MP_BUS: 337 { 338 struct mpc_bus *m = (struct mpc_bus *)mpt; 339 #ifdef CONFIG_X86_IO_APIC 340 MP_bus_info(m); 341 #endif 342 mpt += sizeof(*m); 343 count += sizeof(*m); 344 break; 345 } 346 case MP_IOAPIC: 347 { 348 #ifdef CONFIG_X86_IO_APIC 349 struct mpc_ioapic *m = (struct mpc_ioapic *)mpt; 350 MP_ioapic_info(m); 351 #endif 352 mpt += sizeof(struct mpc_ioapic); 353 count += sizeof(struct mpc_ioapic); 354 break; 355 } 356 case MP_INTSRC: 357 { 358 #ifdef CONFIG_X86_IO_APIC 359 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt; 360 361 MP_intsrc_info(m); 362 #endif 363 mpt += sizeof(struct mpc_intsrc); 364 count += sizeof(struct mpc_intsrc); 365 break; 366 } 367 case MP_LINTSRC: 368 { 369 struct mpc_lintsrc *m = 370 (struct mpc_lintsrc *)mpt; 371 MP_lintsrc_info(m); 372 mpt += sizeof(*m); 373 count += sizeof(*m); 374 break; 375 } 376 default: 377 /* wrong mptable */ 378 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n"); 379 printk(KERN_ERR "type %x\n", *mpt); 380 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16, 381 1, mpc, mpc->length, 1); 382 count = mpc->length; 383 break; 384 } 385 if (x86_quirks->mpc_record) 386 (*x86_quirks->mpc_record)++; 387 } 388 389 #ifdef CONFIG_X86_GENERICARCH 390 generic_bigsmp_probe(); 391 #endif 392 393 #ifdef CONFIG_X86_32 394 setup_apic_routing(); 395 #endif 396 if (!num_processors) 397 printk(KERN_ERR "MPTABLE: no processors registered!\n"); 398 return num_processors; 399 } 400 401 #ifdef CONFIG_X86_IO_APIC 402 403 static int __init ELCR_trigger(unsigned int irq) 404 { 405 unsigned int port; 406 407 port = 0x4d0 + (irq >> 3); 408 return (inb(port) >> (irq & 7)) & 1; 409 } 410 411 static void __init construct_default_ioirq_mptable(int mpc_default_type) 412 { 413 struct mpc_intsrc intsrc; 414 int i; 415 int ELCR_fallback = 0; 416 417 intsrc.type = MP_INTSRC; 418 intsrc.irqflag = 0; /* conforming */ 419 intsrc.srcbus = 0; 420 intsrc.dstapic = mp_ioapics[0].mp_apicid; 421 422 intsrc.irqtype = mp_INT; 423 424 /* 425 * If true, we have an ISA/PCI system with no IRQ entries 426 * in the MP table. To prevent the PCI interrupts from being set up 427 * incorrectly, we try to use the ELCR. The sanity check to see if 428 * there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can 429 * never be level sensitive, so we simply see if the ELCR agrees. 430 * If it does, we assume it's valid. 431 */ 432 if (mpc_default_type == 5) { 433 printk(KERN_INFO "ISA/PCI bus type with no IRQ information... " 434 "falling back to ELCR\n"); 435 436 if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || 437 ELCR_trigger(13)) 438 printk(KERN_ERR "ELCR contains invalid data... " 439 "not using ELCR\n"); 440 else { 441 printk(KERN_INFO 442 "Using ELCR to identify PCI interrupts\n"); 443 ELCR_fallback = 1; 444 } 445 } 446 447 for (i = 0; i < 16; i++) { 448 switch (mpc_default_type) { 449 case 2: 450 if (i == 0 || i == 13) 451 continue; /* IRQ0 & IRQ13 not connected */ 452 /* fall through */ 453 default: 454 if (i == 2) 455 continue; /* IRQ2 is never connected */ 456 } 457 458 if (ELCR_fallback) { 459 /* 460 * If the ELCR indicates a level-sensitive interrupt, we 461 * copy that information over to the MP table in the 462 * irqflag field (level sensitive, active high polarity). 463 */ 464 if (ELCR_trigger(i)) 465 intsrc.irqflag = 13; 466 else 467 intsrc.irqflag = 0; 468 } 469 470 intsrc.srcbusirq = i; 471 intsrc.dstirq = i ? i : 2; /* IRQ0 to INTIN2 */ 472 MP_intsrc_info(&intsrc); 473 } 474 475 intsrc.irqtype = mp_ExtINT; 476 intsrc.srcbusirq = 0; 477 intsrc.dstirq = 0; /* 8259A to INTIN0 */ 478 MP_intsrc_info(&intsrc); 479 } 480 481 482 static void __init construct_ioapic_table(int mpc_default_type) 483 { 484 struct mpc_ioapic ioapic; 485 struct mpc_bus bus; 486 487 bus.type = MP_BUS; 488 bus.busid = 0; 489 switch (mpc_default_type) { 490 default: 491 printk(KERN_ERR "???\nUnknown standard configuration %d\n", 492 mpc_default_type); 493 /* fall through */ 494 case 1: 495 case 5: 496 memcpy(bus.bustype, "ISA ", 6); 497 break; 498 case 2: 499 case 6: 500 case 3: 501 memcpy(bus.bustype, "EISA ", 6); 502 break; 503 case 4: 504 case 7: 505 memcpy(bus.bustype, "MCA ", 6); 506 } 507 MP_bus_info(&bus); 508 if (mpc_default_type > 4) { 509 bus.busid = 1; 510 memcpy(bus.bustype, "PCI ", 6); 511 MP_bus_info(&bus); 512 } 513 514 ioapic.type = MP_IOAPIC; 515 ioapic.apicid = 2; 516 ioapic.apicver = mpc_default_type > 4 ? 0x10 : 0x01; 517 ioapic.flags = MPC_APIC_USABLE; 518 ioapic.apicaddr = 0xFEC00000; 519 MP_ioapic_info(&ioapic); 520 521 /* 522 * We set up most of the low 16 IO-APIC pins according to MPS rules. 523 */ 524 construct_default_ioirq_mptable(mpc_default_type); 525 } 526 #else 527 static inline void __init construct_ioapic_table(int mpc_default_type) { } 528 #endif 529 530 static inline void __init construct_default_ISA_mptable(int mpc_default_type) 531 { 532 struct mpc_cpu processor; 533 struct mpc_lintsrc lintsrc; 534 int linttypes[2] = { mp_ExtINT, mp_NMI }; 535 int i; 536 537 /* 538 * local APIC has default address 539 */ 540 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; 541 542 /* 543 * 2 CPUs, numbered 0 & 1. 544 */ 545 processor.type = MP_PROCESSOR; 546 /* Either an integrated APIC or a discrete 82489DX. */ 547 processor.apicver = mpc_default_type > 4 ? 0x10 : 0x01; 548 processor.cpuflag = CPU_ENABLED; 549 processor.cpufeature = (boot_cpu_data.x86 << 8) | 550 (boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask; 551 processor.featureflag = boot_cpu_data.x86_capability[0]; 552 processor.reserved[0] = 0; 553 processor.reserved[1] = 0; 554 for (i = 0; i < 2; i++) { 555 processor.apicid = i; 556 MP_processor_info(&processor); 557 } 558 559 construct_ioapic_table(mpc_default_type); 560 561 lintsrc.type = MP_LINTSRC; 562 lintsrc.irqflag = 0; /* conforming */ 563 lintsrc.srcbusid = 0; 564 lintsrc.srcbusirq = 0; 565 lintsrc.destapic = MP_APIC_ALL; 566 for (i = 0; i < 2; i++) { 567 lintsrc.irqtype = linttypes[i]; 568 lintsrc.destapiclint = i; 569 MP_lintsrc_info(&lintsrc); 570 } 571 } 572 573 static struct intel_mp_floating *mpf_found; 574 575 /* 576 * Scan the memory blocks for an SMP configuration block. 577 */ 578 static void __init __get_smp_config(unsigned int early) 579 { 580 struct intel_mp_floating *mpf = mpf_found; 581 582 if (!mpf) 583 return; 584 585 if (acpi_lapic && early) 586 return; 587 588 /* 589 * MPS doesn't support hyperthreading, aka only have 590 * thread 0 apic id in MPS table 591 */ 592 if (acpi_lapic && acpi_ioapic) 593 return; 594 595 if (x86_quirks->mach_get_smp_config) { 596 if (x86_quirks->mach_get_smp_config(early)) 597 return; 598 } 599 600 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n", 601 mpf->mpf_specification); 602 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32) 603 if (mpf->mpf_feature2 & (1 << 7)) { 604 printk(KERN_INFO " IMCR and PIC compatibility mode.\n"); 605 pic_mode = 1; 606 } else { 607 printk(KERN_INFO " Virtual Wire compatibility mode.\n"); 608 pic_mode = 0; 609 } 610 #endif 611 /* 612 * Now see if we need to read further. 613 */ 614 if (mpf->mpf_feature1 != 0) { 615 if (early) { 616 /* 617 * local APIC has default address 618 */ 619 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; 620 return; 621 } 622 623 printk(KERN_INFO "Default MP configuration #%d\n", 624 mpf->mpf_feature1); 625 construct_default_ISA_mptable(mpf->mpf_feature1); 626 627 } else if (mpf->mpf_physptr) { 628 629 /* 630 * Read the physical hardware table. Anything here will 631 * override the defaults. 632 */ 633 if (!smp_read_mpc(phys_to_virt(mpf->mpf_physptr), early)) { 634 #ifdef CONFIG_X86_LOCAL_APIC 635 smp_found_config = 0; 636 #endif 637 printk(KERN_ERR 638 "BIOS bug, MP table errors detected!...\n"); 639 printk(KERN_ERR "... disabling SMP support. " 640 "(tell your hw vendor)\n"); 641 return; 642 } 643 644 if (early) 645 return; 646 #ifdef CONFIG_X86_IO_APIC 647 /* 648 * If there are no explicit MP IRQ entries, then we are 649 * broken. We set up most of the low 16 IO-APIC pins to 650 * ISA defaults and hope it will work. 651 */ 652 if (!mp_irq_entries) { 653 struct mpc_bus bus; 654 655 printk(KERN_ERR "BIOS bug, no explicit IRQ entries, " 656 "using default mptable. " 657 "(tell your hw vendor)\n"); 658 659 bus.type = MP_BUS; 660 bus.busid = 0; 661 memcpy(bus.bustype, "ISA ", 6); 662 MP_bus_info(&bus); 663 664 construct_default_ioirq_mptable(0); 665 } 666 #endif 667 } else 668 BUG(); 669 670 if (!early) 671 printk(KERN_INFO "Processors: %d\n", num_processors); 672 /* 673 * Only use the first configuration found. 674 */ 675 } 676 677 void __init early_get_smp_config(void) 678 { 679 __get_smp_config(1); 680 } 681 682 void __init get_smp_config(void) 683 { 684 __get_smp_config(0); 685 } 686 687 static int __init smp_scan_config(unsigned long base, unsigned long length, 688 unsigned reserve) 689 { 690 unsigned int *bp = phys_to_virt(base); 691 struct intel_mp_floating *mpf; 692 693 apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n", 694 bp, length); 695 BUILD_BUG_ON(sizeof(*mpf) != 16); 696 697 while (length > 0) { 698 mpf = (struct intel_mp_floating *)bp; 699 if ((*bp == SMP_MAGIC_IDENT) && 700 (mpf->mpf_length == 1) && 701 !mpf_checksum((unsigned char *)bp, 16) && 702 ((mpf->mpf_specification == 1) 703 || (mpf->mpf_specification == 4))) { 704 #ifdef CONFIG_X86_LOCAL_APIC 705 smp_found_config = 1; 706 #endif 707 mpf_found = mpf; 708 709 printk(KERN_INFO "found SMP MP-table at [%p] %08lx\n", 710 mpf, virt_to_phys(mpf)); 711 712 if (!reserve) 713 return 1; 714 reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE, 715 BOOTMEM_DEFAULT); 716 if (mpf->mpf_physptr) { 717 unsigned long size = PAGE_SIZE; 718 #ifdef CONFIG_X86_32 719 /* 720 * We cannot access to MPC table to compute 721 * table size yet, as only few megabytes from 722 * the bottom is mapped now. 723 * PC-9800's MPC table places on the very last 724 * of physical memory; so that simply reserving 725 * PAGE_SIZE from mpg->mpf_physptr yields BUG() 726 * in reserve_bootmem. 727 */ 728 unsigned long end = max_low_pfn * PAGE_SIZE; 729 if (mpf->mpf_physptr + size > end) 730 size = end - mpf->mpf_physptr; 731 #endif 732 reserve_bootmem_generic(mpf->mpf_physptr, size, 733 BOOTMEM_DEFAULT); 734 } 735 736 return 1; 737 } 738 bp += 4; 739 length -= 16; 740 } 741 return 0; 742 } 743 744 static void __init __find_smp_config(unsigned int reserve) 745 { 746 unsigned int address; 747 748 if (x86_quirks->mach_find_smp_config) { 749 if (x86_quirks->mach_find_smp_config(reserve)) 750 return; 751 } 752 /* 753 * FIXME: Linux assumes you have 640K of base ram.. 754 * this continues the error... 755 * 756 * 1) Scan the bottom 1K for a signature 757 * 2) Scan the top 1K of base RAM 758 * 3) Scan the 64K of bios 759 */ 760 if (smp_scan_config(0x0, 0x400, reserve) || 761 smp_scan_config(639 * 0x400, 0x400, reserve) || 762 smp_scan_config(0xF0000, 0x10000, reserve)) 763 return; 764 /* 765 * If it is an SMP machine we should know now, unless the 766 * configuration is in an EISA/MCA bus machine with an 767 * extended bios data area. 768 * 769 * there is a real-mode segmented pointer pointing to the 770 * 4K EBDA area at 0x40E, calculate and scan it here. 771 * 772 * NOTE! There are Linux loaders that will corrupt the EBDA 773 * area, and as such this kind of SMP config may be less 774 * trustworthy, simply because the SMP table may have been 775 * stomped on during early boot. These loaders are buggy and 776 * should be fixed. 777 * 778 * MP1.4 SPEC states to only scan first 1K of 4K EBDA. 779 */ 780 781 address = get_bios_ebda(); 782 if (address) 783 smp_scan_config(address, 0x400, reserve); 784 } 785 786 void __init early_find_smp_config(void) 787 { 788 __find_smp_config(0); 789 } 790 791 void __init find_smp_config(void) 792 { 793 __find_smp_config(1); 794 } 795 796 #ifdef CONFIG_X86_IO_APIC 797 static u8 __initdata irq_used[MAX_IRQ_SOURCES]; 798 799 static int __init get_MP_intsrc_index(struct mpc_intsrc *m) 800 { 801 int i; 802 803 if (m->irqtype != mp_INT) 804 return 0; 805 806 if (m->irqflag != 0x0f) 807 return 0; 808 809 /* not legacy */ 810 811 for (i = 0; i < mp_irq_entries; i++) { 812 if (mp_irqs[i].mp_irqtype != mp_INT) 813 continue; 814 815 if (mp_irqs[i].mp_irqflag != 0x0f) 816 continue; 817 818 if (mp_irqs[i].mp_srcbus != m->srcbus) 819 continue; 820 if (mp_irqs[i].mp_srcbusirq != m->srcbusirq) 821 continue; 822 if (irq_used[i]) { 823 /* already claimed */ 824 return -2; 825 } 826 irq_used[i] = 1; 827 return i; 828 } 829 830 /* not found */ 831 return -1; 832 } 833 834 #define SPARE_SLOT_NUM 20 835 836 static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM]; 837 #endif 838 839 static int __init replace_intsrc_all(struct mpc_table *mpc, 840 unsigned long mpc_new_phys, 841 unsigned long mpc_new_length) 842 { 843 #ifdef CONFIG_X86_IO_APIC 844 int i; 845 int nr_m_spare = 0; 846 #endif 847 848 int count = sizeof(*mpc); 849 unsigned char *mpt = ((unsigned char *)mpc) + count; 850 851 printk(KERN_INFO "mpc_length %x\n", mpc->length); 852 while (count < mpc->length) { 853 switch (*mpt) { 854 case MP_PROCESSOR: 855 { 856 struct mpc_cpu *m = (struct mpc_cpu *)mpt; 857 mpt += sizeof(*m); 858 count += sizeof(*m); 859 break; 860 } 861 case MP_BUS: 862 { 863 struct mpc_bus *m = (struct mpc_bus *)mpt; 864 mpt += sizeof(*m); 865 count += sizeof(*m); 866 break; 867 } 868 case MP_IOAPIC: 869 { 870 mpt += sizeof(struct mpc_ioapic); 871 count += sizeof(struct mpc_ioapic); 872 break; 873 } 874 case MP_INTSRC: 875 { 876 #ifdef CONFIG_X86_IO_APIC 877 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt; 878 879 printk(KERN_INFO "OLD "); 880 print_MP_intsrc_info(m); 881 i = get_MP_intsrc_index(m); 882 if (i > 0) { 883 assign_to_mpc_intsrc(&mp_irqs[i], m); 884 printk(KERN_INFO "NEW "); 885 print_mp_irq_info(&mp_irqs[i]); 886 } else if (!i) { 887 /* legacy, do nothing */ 888 } else if (nr_m_spare < SPARE_SLOT_NUM) { 889 /* 890 * not found (-1), or duplicated (-2) 891 * are invalid entries, 892 * we need to use the slot later 893 */ 894 m_spare[nr_m_spare] = m; 895 nr_m_spare++; 896 } 897 #endif 898 mpt += sizeof(struct mpc_intsrc); 899 count += sizeof(struct mpc_intsrc); 900 break; 901 } 902 case MP_LINTSRC: 903 { 904 struct mpc_lintsrc *m = 905 (struct mpc_lintsrc *)mpt; 906 mpt += sizeof(*m); 907 count += sizeof(*m); 908 break; 909 } 910 default: 911 /* wrong mptable */ 912 printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n"); 913 printk(KERN_ERR "type %x\n", *mpt); 914 print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16, 915 1, mpc, mpc->length, 1); 916 goto out; 917 } 918 } 919 920 #ifdef CONFIG_X86_IO_APIC 921 for (i = 0; i < mp_irq_entries; i++) { 922 if (irq_used[i]) 923 continue; 924 925 if (mp_irqs[i].mp_irqtype != mp_INT) 926 continue; 927 928 if (mp_irqs[i].mp_irqflag != 0x0f) 929 continue; 930 931 if (nr_m_spare > 0) { 932 printk(KERN_INFO "*NEW* found "); 933 nr_m_spare--; 934 assign_to_mpc_intsrc(&mp_irqs[i], m_spare[nr_m_spare]); 935 m_spare[nr_m_spare] = NULL; 936 } else { 937 struct mpc_intsrc *m = (struct mpc_intsrc *)mpt; 938 count += sizeof(struct mpc_intsrc); 939 if (!mpc_new_phys) { 940 printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count); 941 } else { 942 if (count <= mpc_new_length) 943 printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count); 944 else { 945 printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length); 946 goto out; 947 } 948 } 949 assign_to_mpc_intsrc(&mp_irqs[i], m); 950 mpc->length = count; 951 mpt += sizeof(struct mpc_intsrc); 952 } 953 print_mp_irq_info(&mp_irqs[i]); 954 } 955 #endif 956 out: 957 /* update checksum */ 958 mpc->checksum = 0; 959 mpc->checksum -= mpf_checksum((unsigned char *)mpc, mpc->length); 960 961 return 0; 962 } 963 964 static int __initdata enable_update_mptable; 965 966 static int __init update_mptable_setup(char *str) 967 { 968 enable_update_mptable = 1; 969 return 0; 970 } 971 early_param("update_mptable", update_mptable_setup); 972 973 static unsigned long __initdata mpc_new_phys; 974 static unsigned long mpc_new_length __initdata = 4096; 975 976 /* alloc_mptable or alloc_mptable=4k */ 977 static int __initdata alloc_mptable; 978 static int __init parse_alloc_mptable_opt(char *p) 979 { 980 enable_update_mptable = 1; 981 alloc_mptable = 1; 982 if (!p) 983 return 0; 984 mpc_new_length = memparse(p, &p); 985 return 0; 986 } 987 early_param("alloc_mptable", parse_alloc_mptable_opt); 988 989 void __init early_reserve_e820_mpc_new(void) 990 { 991 if (enable_update_mptable && alloc_mptable) { 992 u64 startt = 0; 993 #ifdef CONFIG_X86_TRAMPOLINE 994 startt = TRAMPOLINE_BASE; 995 #endif 996 mpc_new_phys = early_reserve_e820(startt, mpc_new_length, 4); 997 } 998 } 999 1000 static int __init update_mp_table(void) 1001 { 1002 char str[16]; 1003 char oem[10]; 1004 struct intel_mp_floating *mpf; 1005 struct mpc_table *mpc, *mpc_new; 1006 1007 if (!enable_update_mptable) 1008 return 0; 1009 1010 mpf = mpf_found; 1011 if (!mpf) 1012 return 0; 1013 1014 /* 1015 * Now see if we need to go further. 1016 */ 1017 if (mpf->mpf_feature1 != 0) 1018 return 0; 1019 1020 if (!mpf->mpf_physptr) 1021 return 0; 1022 1023 mpc = phys_to_virt(mpf->mpf_physptr); 1024 1025 if (!smp_check_mpc(mpc, oem, str)) 1026 return 0; 1027 1028 printk(KERN_INFO "mpf: %lx\n", virt_to_phys(mpf)); 1029 printk(KERN_INFO "mpf_physptr: %x\n", mpf->mpf_physptr); 1030 1031 if (mpc_new_phys && mpc->length > mpc_new_length) { 1032 mpc_new_phys = 0; 1033 printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n", 1034 mpc_new_length); 1035 } 1036 1037 if (!mpc_new_phys) { 1038 unsigned char old, new; 1039 /* check if we can change the postion */ 1040 mpc->checksum = 0; 1041 old = mpf_checksum((unsigned char *)mpc, mpc->length); 1042 mpc->checksum = 0xff; 1043 new = mpf_checksum((unsigned char *)mpc, mpc->length); 1044 if (old == new) { 1045 printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n"); 1046 return 0; 1047 } 1048 printk(KERN_INFO "use in-positon replacing\n"); 1049 } else { 1050 mpf->mpf_physptr = mpc_new_phys; 1051 mpc_new = phys_to_virt(mpc_new_phys); 1052 memcpy(mpc_new, mpc, mpc->length); 1053 mpc = mpc_new; 1054 /* check if we can modify that */ 1055 if (mpc_new_phys - mpf->mpf_physptr) { 1056 struct intel_mp_floating *mpf_new; 1057 /* steal 16 bytes from [0, 1k) */ 1058 printk(KERN_INFO "mpf new: %x\n", 0x400 - 16); 1059 mpf_new = phys_to_virt(0x400 - 16); 1060 memcpy(mpf_new, mpf, 16); 1061 mpf = mpf_new; 1062 mpf->mpf_physptr = mpc_new_phys; 1063 } 1064 mpf->mpf_checksum = 0; 1065 mpf->mpf_checksum -= mpf_checksum((unsigned char *)mpf, 16); 1066 printk(KERN_INFO "mpf_physptr new: %x\n", mpf->mpf_physptr); 1067 } 1068 1069 /* 1070 * only replace the one with mp_INT and 1071 * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, 1072 * already in mp_irqs , stored by ... and mp_config_acpi_gsi, 1073 * may need pci=routeirq for all coverage 1074 */ 1075 replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length); 1076 1077 return 0; 1078 } 1079 1080 late_initcall(update_mp_table); 1081