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); 918