1 /* 2 * boot.c - Architecture-Specific Low-Level ACPI Boot Support 3 * 4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 5 * Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com> 6 * 7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 22 * 23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 24 */ 25 26 #include <linux/init.h> 27 #include <linux/acpi.h> 28 #include <linux/acpi_pmtmr.h> 29 #include <linux/efi.h> 30 #include <linux/cpumask.h> 31 #include <linux/module.h> 32 #include <linux/dmi.h> 33 #include <linux/irq.h> 34 #include <linux/bootmem.h> 35 #include <linux/ioport.h> 36 37 #include <asm/pgtable.h> 38 #include <asm/io_apic.h> 39 #include <asm/apic.h> 40 #include <asm/io.h> 41 #include <asm/mpspec.h> 42 #include <asm/smp.h> 43 44 #ifdef CONFIG_X86_LOCAL_APIC 45 # include <mach_apic.h> 46 #endif 47 48 static int __initdata acpi_force = 0; 49 50 #ifdef CONFIG_ACPI 51 int acpi_disabled = 0; 52 #else 53 int acpi_disabled = 1; 54 #endif 55 EXPORT_SYMBOL(acpi_disabled); 56 57 #ifdef CONFIG_X86_64 58 59 #include <asm/proto.h> 60 #include <asm/genapic.h> 61 62 #else /* X86 */ 63 64 #ifdef CONFIG_X86_LOCAL_APIC 65 #include <mach_apic.h> 66 #include <mach_mpparse.h> 67 #endif /* CONFIG_X86_LOCAL_APIC */ 68 69 #endif /* X86 */ 70 71 #define BAD_MADT_ENTRY(entry, end) ( \ 72 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \ 73 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry)) 74 75 #define PREFIX "ACPI: " 76 77 int acpi_noirq; /* skip ACPI IRQ initialization */ 78 int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */ 79 EXPORT_SYMBOL(acpi_pci_disabled); 80 int acpi_ht __initdata = 1; /* enable HT */ 81 82 int acpi_lapic; 83 int acpi_ioapic; 84 int acpi_strict; 85 86 u8 acpi_sci_flags __initdata; 87 int acpi_sci_override_gsi __initdata; 88 int acpi_skip_timer_override __initdata; 89 int acpi_use_timer_override __initdata; 90 91 #ifdef CONFIG_X86_LOCAL_APIC 92 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE; 93 #endif 94 95 #ifndef __HAVE_ARCH_CMPXCHG 96 #warning ACPI uses CMPXCHG, i486 and later hardware 97 #endif 98 99 /* -------------------------------------------------------------------------- 100 Boot-time Configuration 101 -------------------------------------------------------------------------- */ 102 103 /* 104 * The default interrupt routing model is PIC (8259). This gets 105 * overridden if IOAPICs are enumerated (below). 106 */ 107 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC; 108 109 #ifdef CONFIG_X86_64 110 111 /* rely on all ACPI tables being in the direct mapping */ 112 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size) 113 { 114 if (!phys_addr || !size) 115 return NULL; 116 117 if (phys_addr+size <= (max_pfn_mapped << PAGE_SHIFT) + PAGE_SIZE) 118 return __va(phys_addr); 119 120 return NULL; 121 } 122 123 #else 124 125 /* 126 * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END, 127 * to map the target physical address. The problem is that set_fixmap() 128 * provides a single page, and it is possible that the page is not 129 * sufficient. 130 * By using this area, we can map up to MAX_IO_APICS pages temporarily, 131 * i.e. until the next __va_range() call. 132 * 133 * Important Safety Note: The fixed I/O APIC page numbers are *subtracted* 134 * from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and 135 * count idx down while incrementing the phys address. 136 */ 137 char *__init __acpi_map_table(unsigned long phys, unsigned long size) 138 { 139 unsigned long base, offset, mapped_size; 140 int idx; 141 142 if (phys + size < 8 * 1024 * 1024) 143 return __va(phys); 144 145 offset = phys & (PAGE_SIZE - 1); 146 mapped_size = PAGE_SIZE - offset; 147 set_fixmap(FIX_ACPI_END, phys); 148 base = fix_to_virt(FIX_ACPI_END); 149 150 /* 151 * Most cases can be covered by the below. 152 */ 153 idx = FIX_ACPI_END; 154 while (mapped_size < size) { 155 if (--idx < FIX_ACPI_BEGIN) 156 return NULL; /* cannot handle this */ 157 phys += PAGE_SIZE; 158 set_fixmap(idx, phys); 159 mapped_size += PAGE_SIZE; 160 } 161 162 return ((unsigned char *)base + offset); 163 } 164 #endif 165 166 #ifdef CONFIG_PCI_MMCONFIG 167 /* The physical address of the MMCONFIG aperture. Set from ACPI tables. */ 168 struct acpi_mcfg_allocation *pci_mmcfg_config; 169 int pci_mmcfg_config_num; 170 171 int __init acpi_parse_mcfg(struct acpi_table_header *header) 172 { 173 struct acpi_table_mcfg *mcfg; 174 unsigned long i; 175 int config_size; 176 177 if (!header) 178 return -EINVAL; 179 180 mcfg = (struct acpi_table_mcfg *)header; 181 182 /* how many config structures do we have */ 183 pci_mmcfg_config_num = 0; 184 i = header->length - sizeof(struct acpi_table_mcfg); 185 while (i >= sizeof(struct acpi_mcfg_allocation)) { 186 ++pci_mmcfg_config_num; 187 i -= sizeof(struct acpi_mcfg_allocation); 188 }; 189 if (pci_mmcfg_config_num == 0) { 190 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n"); 191 return -ENODEV; 192 } 193 194 config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config); 195 pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL); 196 if (!pci_mmcfg_config) { 197 printk(KERN_WARNING PREFIX 198 "No memory for MCFG config tables\n"); 199 return -ENOMEM; 200 } 201 202 memcpy(pci_mmcfg_config, &mcfg[1], config_size); 203 for (i = 0; i < pci_mmcfg_config_num; ++i) { 204 if (pci_mmcfg_config[i].address > 0xFFFFFFFF) { 205 printk(KERN_ERR PREFIX 206 "MMCONFIG not in low 4GB of memory\n"); 207 kfree(pci_mmcfg_config); 208 pci_mmcfg_config_num = 0; 209 return -ENODEV; 210 } 211 } 212 213 return 0; 214 } 215 #endif /* CONFIG_PCI_MMCONFIG */ 216 217 #ifdef CONFIG_X86_LOCAL_APIC 218 static int __init acpi_parse_madt(struct acpi_table_header *table) 219 { 220 struct acpi_table_madt *madt = NULL; 221 222 if (!cpu_has_apic) 223 return -EINVAL; 224 225 madt = (struct acpi_table_madt *)table; 226 if (!madt) { 227 printk(KERN_WARNING PREFIX "Unable to map MADT\n"); 228 return -ENODEV; 229 } 230 231 if (madt->address) { 232 acpi_lapic_addr = (u64) madt->address; 233 234 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n", 235 madt->address); 236 } 237 238 acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id); 239 240 return 0; 241 } 242 243 static void __cpuinit acpi_register_lapic(int id, u8 enabled) 244 { 245 if (!enabled) { 246 ++disabled_cpus; 247 return; 248 } 249 250 generic_processor_info(id, 0); 251 } 252 253 static int __init 254 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end) 255 { 256 struct acpi_madt_local_apic *processor = NULL; 257 258 processor = (struct acpi_madt_local_apic *)header; 259 260 if (BAD_MADT_ENTRY(processor, end)) 261 return -EINVAL; 262 263 acpi_table_print_madt_entry(header); 264 265 /* 266 * We need to register disabled CPU as well to permit 267 * counting disabled CPUs. This allows us to size 268 * cpus_possible_map more accurately, to permit 269 * to not preallocating memory for all NR_CPUS 270 * when we use CPU hotplug. 271 */ 272 acpi_register_lapic(processor->id, /* APIC ID */ 273 processor->lapic_flags & ACPI_MADT_ENABLED); 274 275 return 0; 276 } 277 278 static int __init 279 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end) 280 { 281 struct acpi_madt_local_sapic *processor = NULL; 282 283 processor = (struct acpi_madt_local_sapic *)header; 284 285 if (BAD_MADT_ENTRY(processor, end)) 286 return -EINVAL; 287 288 acpi_table_print_madt_entry(header); 289 290 acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */ 291 processor->lapic_flags & ACPI_MADT_ENABLED); 292 293 return 0; 294 } 295 296 static int __init 297 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header, 298 const unsigned long end) 299 { 300 struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL; 301 302 lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header; 303 304 if (BAD_MADT_ENTRY(lapic_addr_ovr, end)) 305 return -EINVAL; 306 307 acpi_lapic_addr = lapic_addr_ovr->address; 308 309 return 0; 310 } 311 312 static int __init 313 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end) 314 { 315 struct acpi_madt_local_apic_nmi *lapic_nmi = NULL; 316 317 lapic_nmi = (struct acpi_madt_local_apic_nmi *)header; 318 319 if (BAD_MADT_ENTRY(lapic_nmi, end)) 320 return -EINVAL; 321 322 acpi_table_print_madt_entry(header); 323 324 if (lapic_nmi->lint != 1) 325 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n"); 326 327 return 0; 328 } 329 330 #endif /*CONFIG_X86_LOCAL_APIC */ 331 332 #ifdef CONFIG_X86_IO_APIC 333 334 struct mp_ioapic_routing mp_ioapic_routing[MAX_IO_APICS]; 335 336 static int __init 337 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end) 338 { 339 struct acpi_madt_io_apic *ioapic = NULL; 340 341 ioapic = (struct acpi_madt_io_apic *)header; 342 343 if (BAD_MADT_ENTRY(ioapic, end)) 344 return -EINVAL; 345 346 acpi_table_print_madt_entry(header); 347 348 mp_register_ioapic(ioapic->id, 349 ioapic->address, ioapic->global_irq_base); 350 351 return 0; 352 } 353 354 /* 355 * Parse Interrupt Source Override for the ACPI SCI 356 */ 357 static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger) 358 { 359 if (trigger == 0) /* compatible SCI trigger is level */ 360 trigger = 3; 361 362 if (polarity == 0) /* compatible SCI polarity is low */ 363 polarity = 3; 364 365 /* Command-line over-ride via acpi_sci= */ 366 if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) 367 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2; 368 369 if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK) 370 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK; 371 372 /* 373 * mp_config_acpi_legacy_irqs() already setup IRQs < 16 374 * If GSI is < 16, this will update its flags, 375 * else it will create a new mp_irqs[] entry. 376 */ 377 mp_override_legacy_irq(gsi, polarity, trigger, gsi); 378 379 /* 380 * stash over-ride to indicate we've been here 381 * and for later update of acpi_gbl_FADT 382 */ 383 acpi_sci_override_gsi = gsi; 384 return; 385 } 386 387 static int __init 388 acpi_parse_int_src_ovr(struct acpi_subtable_header * header, 389 const unsigned long end) 390 { 391 struct acpi_madt_interrupt_override *intsrc = NULL; 392 393 intsrc = (struct acpi_madt_interrupt_override *)header; 394 395 if (BAD_MADT_ENTRY(intsrc, end)) 396 return -EINVAL; 397 398 acpi_table_print_madt_entry(header); 399 400 if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) { 401 acpi_sci_ioapic_setup(intsrc->global_irq, 402 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK, 403 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 404 return 0; 405 } 406 407 if (acpi_skip_timer_override && 408 intsrc->source_irq == 0 && intsrc->global_irq == 2) { 409 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n"); 410 return 0; 411 } 412 413 mp_override_legacy_irq(intsrc->source_irq, 414 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK, 415 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2, 416 intsrc->global_irq); 417 418 return 0; 419 } 420 421 static int __init 422 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end) 423 { 424 struct acpi_madt_nmi_source *nmi_src = NULL; 425 426 nmi_src = (struct acpi_madt_nmi_source *)header; 427 428 if (BAD_MADT_ENTRY(nmi_src, end)) 429 return -EINVAL; 430 431 acpi_table_print_madt_entry(header); 432 433 /* TBD: Support nimsrc entries? */ 434 435 return 0; 436 } 437 438 #endif /* CONFIG_X86_IO_APIC */ 439 440 /* 441 * acpi_pic_sci_set_trigger() 442 * 443 * use ELCR to set PIC-mode trigger type for SCI 444 * 445 * If a PIC-mode SCI is not recognized or gives spurious IRQ7's 446 * it may require Edge Trigger -- use "acpi_sci=edge" 447 * 448 * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers 449 * for the 8259 PIC. bit[n] = 1 means irq[n] is Level, otherwise Edge. 450 * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0) 451 * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0) 452 */ 453 454 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger) 455 { 456 unsigned int mask = 1 << irq; 457 unsigned int old, new; 458 459 /* Real old ELCR mask */ 460 old = inb(0x4d0) | (inb(0x4d1) << 8); 461 462 /* 463 * If we use ACPI to set PCI IRQs, then we should clear ELCR 464 * since we will set it correctly as we enable the PCI irq 465 * routing. 466 */ 467 new = acpi_noirq ? old : 0; 468 469 /* 470 * Update SCI information in the ELCR, it isn't in the PCI 471 * routing tables.. 472 */ 473 switch (trigger) { 474 case 1: /* Edge - clear */ 475 new &= ~mask; 476 break; 477 case 3: /* Level - set */ 478 new |= mask; 479 break; 480 } 481 482 if (old == new) 483 return; 484 485 printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old); 486 outb(new, 0x4d0); 487 outb(new >> 8, 0x4d1); 488 } 489 490 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq) 491 { 492 *irq = gsi; 493 return 0; 494 } 495 496 /* 497 * success: return IRQ number (>=0) 498 * failure: return < 0 499 */ 500 int acpi_register_gsi(u32 gsi, int triggering, int polarity) 501 { 502 unsigned int irq; 503 unsigned int plat_gsi = gsi; 504 505 #ifdef CONFIG_PCI 506 /* 507 * Make sure all (legacy) PCI IRQs are set as level-triggered. 508 */ 509 if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) { 510 extern void eisa_set_level_irq(unsigned int irq); 511 512 if (triggering == ACPI_LEVEL_SENSITIVE) 513 eisa_set_level_irq(gsi); 514 } 515 #endif 516 517 #ifdef CONFIG_X86_IO_APIC 518 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) { 519 plat_gsi = mp_register_gsi(gsi, triggering, polarity); 520 } 521 #endif 522 acpi_gsi_to_irq(plat_gsi, &irq); 523 return irq; 524 } 525 526 /* 527 * ACPI based hotplug support for CPU 528 */ 529 #ifdef CONFIG_ACPI_HOTPLUG_CPU 530 531 static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu) 532 { 533 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 534 union acpi_object *obj; 535 struct acpi_madt_local_apic *lapic; 536 cpumask_t tmp_map, new_map; 537 u8 physid; 538 int cpu; 539 540 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 541 return -EINVAL; 542 543 if (!buffer.length || !buffer.pointer) 544 return -EINVAL; 545 546 obj = buffer.pointer; 547 if (obj->type != ACPI_TYPE_BUFFER || 548 obj->buffer.length < sizeof(*lapic)) { 549 kfree(buffer.pointer); 550 return -EINVAL; 551 } 552 553 lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer; 554 555 if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC || 556 !(lapic->lapic_flags & ACPI_MADT_ENABLED)) { 557 kfree(buffer.pointer); 558 return -EINVAL; 559 } 560 561 physid = lapic->id; 562 563 kfree(buffer.pointer); 564 buffer.length = ACPI_ALLOCATE_BUFFER; 565 buffer.pointer = NULL; 566 567 tmp_map = cpu_present_map; 568 acpi_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED); 569 570 /* 571 * If mp_register_lapic successfully generates a new logical cpu 572 * number, then the following will get us exactly what was mapped 573 */ 574 cpus_andnot(new_map, cpu_present_map, tmp_map); 575 if (cpus_empty(new_map)) { 576 printk ("Unable to map lapic to logical cpu number\n"); 577 return -EINVAL; 578 } 579 580 cpu = first_cpu(new_map); 581 582 *pcpu = cpu; 583 return 0; 584 } 585 586 /* wrapper to silence section mismatch warning */ 587 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu) 588 { 589 return _acpi_map_lsapic(handle, pcpu); 590 } 591 EXPORT_SYMBOL(acpi_map_lsapic); 592 593 int acpi_unmap_lsapic(int cpu) 594 { 595 per_cpu(x86_cpu_to_apicid, cpu) = -1; 596 cpu_clear(cpu, cpu_present_map); 597 num_processors--; 598 599 return (0); 600 } 601 602 EXPORT_SYMBOL(acpi_unmap_lsapic); 603 #endif /* CONFIG_ACPI_HOTPLUG_CPU */ 604 605 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base) 606 { 607 /* TBD */ 608 return -EINVAL; 609 } 610 611 EXPORT_SYMBOL(acpi_register_ioapic); 612 613 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base) 614 { 615 /* TBD */ 616 return -EINVAL; 617 } 618 619 EXPORT_SYMBOL(acpi_unregister_ioapic); 620 621 static int __init acpi_parse_sbf(struct acpi_table_header *table) 622 { 623 struct acpi_table_boot *sb; 624 625 sb = (struct acpi_table_boot *)table; 626 if (!sb) { 627 printk(KERN_WARNING PREFIX "Unable to map SBF\n"); 628 return -ENODEV; 629 } 630 631 sbf_port = sb->cmos_index; /* Save CMOS port */ 632 633 return 0; 634 } 635 636 #ifdef CONFIG_HPET_TIMER 637 #include <asm/hpet.h> 638 639 static struct __initdata resource *hpet_res; 640 641 static int __init acpi_parse_hpet(struct acpi_table_header *table) 642 { 643 struct acpi_table_hpet *hpet_tbl; 644 645 hpet_tbl = (struct acpi_table_hpet *)table; 646 if (!hpet_tbl) { 647 printk(KERN_WARNING PREFIX "Unable to map HPET\n"); 648 return -ENODEV; 649 } 650 651 if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) { 652 printk(KERN_WARNING PREFIX "HPET timers must be located in " 653 "memory.\n"); 654 return -1; 655 } 656 657 hpet_address = hpet_tbl->address.address; 658 659 /* 660 * Some broken BIOSes advertise HPET at 0x0. We really do not 661 * want to allocate a resource there. 662 */ 663 if (!hpet_address) { 664 printk(KERN_WARNING PREFIX 665 "HPET id: %#x base: %#lx is invalid\n", 666 hpet_tbl->id, hpet_address); 667 return 0; 668 } 669 #ifdef CONFIG_X86_64 670 /* 671 * Some even more broken BIOSes advertise HPET at 672 * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add 673 * some noise: 674 */ 675 if (hpet_address == 0xfed0000000000000UL) { 676 if (!hpet_force_user) { 677 printk(KERN_WARNING PREFIX "HPET id: %#x " 678 "base: 0xfed0000000000000 is bogus\n " 679 "try hpet=force on the kernel command line to " 680 "fix it up to 0xfed00000.\n", hpet_tbl->id); 681 hpet_address = 0; 682 return 0; 683 } 684 printk(KERN_WARNING PREFIX 685 "HPET id: %#x base: 0xfed0000000000000 fixed up " 686 "to 0xfed00000.\n", hpet_tbl->id); 687 hpet_address >>= 32; 688 } 689 #endif 690 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n", 691 hpet_tbl->id, hpet_address); 692 693 /* 694 * Allocate and initialize the HPET firmware resource for adding into 695 * the resource tree during the lateinit timeframe. 696 */ 697 #define HPET_RESOURCE_NAME_SIZE 9 698 hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE); 699 700 hpet_res->name = (void *)&hpet_res[1]; 701 hpet_res->flags = IORESOURCE_MEM; 702 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u", 703 hpet_tbl->sequence); 704 705 hpet_res->start = hpet_address; 706 hpet_res->end = hpet_address + (1 * 1024) - 1; 707 708 return 0; 709 } 710 711 /* 712 * hpet_insert_resource inserts the HPET resources used into the resource 713 * tree. 714 */ 715 static __init int hpet_insert_resource(void) 716 { 717 if (!hpet_res) 718 return 1; 719 720 return insert_resource(&iomem_resource, hpet_res); 721 } 722 723 late_initcall(hpet_insert_resource); 724 725 #else 726 #define acpi_parse_hpet NULL 727 #endif 728 729 static int __init acpi_parse_fadt(struct acpi_table_header *table) 730 { 731 732 #ifdef CONFIG_X86_PM_TIMER 733 /* detect the location of the ACPI PM Timer */ 734 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) { 735 /* FADT rev. 2 */ 736 if (acpi_gbl_FADT.xpm_timer_block.space_id != 737 ACPI_ADR_SPACE_SYSTEM_IO) 738 return 0; 739 740 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address; 741 /* 742 * "X" fields are optional extensions to the original V1.0 743 * fields, so we must selectively expand V1.0 fields if the 744 * corresponding X field is zero. 745 */ 746 if (!pmtmr_ioport) 747 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block; 748 } else { 749 /* FADT rev. 1 */ 750 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block; 751 } 752 if (pmtmr_ioport) 753 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n", 754 pmtmr_ioport); 755 #endif 756 return 0; 757 } 758 759 #ifdef CONFIG_X86_LOCAL_APIC 760 /* 761 * Parse LAPIC entries in MADT 762 * returns 0 on success, < 0 on error 763 */ 764 765 static void __init acpi_register_lapic_address(unsigned long address) 766 { 767 mp_lapic_addr = address; 768 769 set_fixmap_nocache(FIX_APIC_BASE, address); 770 if (boot_cpu_physical_apicid == -1U) 771 boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id()); 772 } 773 774 static int __init early_acpi_parse_madt_lapic_addr_ovr(void) 775 { 776 int count; 777 778 if (!cpu_has_apic) 779 return -ENODEV; 780 781 /* 782 * Note that the LAPIC address is obtained from the MADT (32-bit value) 783 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value). 784 */ 785 786 count = 787 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, 788 acpi_parse_lapic_addr_ovr, 0); 789 if (count < 0) { 790 printk(KERN_ERR PREFIX 791 "Error parsing LAPIC address override entry\n"); 792 return count; 793 } 794 795 acpi_register_lapic_address(acpi_lapic_addr); 796 797 return count; 798 } 799 800 static int __init acpi_parse_madt_lapic_entries(void) 801 { 802 int count; 803 804 if (!cpu_has_apic) 805 return -ENODEV; 806 807 /* 808 * Note that the LAPIC address is obtained from the MADT (32-bit value) 809 * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value). 810 */ 811 812 count = 813 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, 814 acpi_parse_lapic_addr_ovr, 0); 815 if (count < 0) { 816 printk(KERN_ERR PREFIX 817 "Error parsing LAPIC address override entry\n"); 818 return count; 819 } 820 821 acpi_register_lapic_address(acpi_lapic_addr); 822 823 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, 824 acpi_parse_sapic, MAX_APICS); 825 826 if (!count) 827 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC, 828 acpi_parse_lapic, MAX_APICS); 829 if (!count) { 830 printk(KERN_ERR PREFIX "No LAPIC entries present\n"); 831 /* TBD: Cleanup to allow fallback to MPS */ 832 return -ENODEV; 833 } else if (count < 0) { 834 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n"); 835 /* TBD: Cleanup to allow fallback to MPS */ 836 return count; 837 } 838 839 count = 840 acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0); 841 if (count < 0) { 842 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n"); 843 /* TBD: Cleanup to allow fallback to MPS */ 844 return count; 845 } 846 return 0; 847 } 848 #endif /* CONFIG_X86_LOCAL_APIC */ 849 850 #ifdef CONFIG_X86_IO_APIC 851 /* 852 * Parse IOAPIC related entries in MADT 853 * returns 0 on success, < 0 on error 854 */ 855 static int __init acpi_parse_madt_ioapic_entries(void) 856 { 857 int count; 858 859 /* 860 * ACPI interpreter is required to complete interrupt setup, 861 * so if it is off, don't enumerate the io-apics with ACPI. 862 * If MPS is present, it will handle them, 863 * otherwise the system will stay in PIC mode 864 */ 865 if (acpi_disabled || acpi_noirq) { 866 return -ENODEV; 867 } 868 869 if (!cpu_has_apic) 870 return -ENODEV; 871 872 /* 873 * if "noapic" boot option, don't look for IO-APICs 874 */ 875 if (skip_ioapic_setup) { 876 printk(KERN_INFO PREFIX "Skipping IOAPIC probe " 877 "due to 'noapic' option.\n"); 878 return -ENODEV; 879 } 880 881 count = 882 acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic, 883 MAX_IO_APICS); 884 if (!count) { 885 printk(KERN_ERR PREFIX "No IOAPIC entries present\n"); 886 return -ENODEV; 887 } else if (count < 0) { 888 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n"); 889 return count; 890 } 891 892 count = 893 acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 894 NR_IRQ_VECTORS); 895 if (count < 0) { 896 printk(KERN_ERR PREFIX 897 "Error parsing interrupt source overrides entry\n"); 898 /* TBD: Cleanup to allow fallback to MPS */ 899 return count; 900 } 901 902 /* 903 * If BIOS did not supply an INT_SRC_OVR for the SCI 904 * pretend we got one so we can set the SCI flags. 905 */ 906 if (!acpi_sci_override_gsi) 907 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0); 908 909 /* Fill in identity legacy mapings where no override */ 910 mp_config_acpi_legacy_irqs(); 911 912 count = 913 acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 914 NR_IRQ_VECTORS); 915 if (count < 0) { 916 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n"); 917 /* TBD: Cleanup to allow fallback to MPS */ 918 return count; 919 } 920 921 return 0; 922 } 923 #else 924 static inline int acpi_parse_madt_ioapic_entries(void) 925 { 926 return -1; 927 } 928 #endif /* !CONFIG_X86_IO_APIC */ 929 930 static void __init early_acpi_process_madt(void) 931 { 932 #ifdef CONFIG_X86_LOCAL_APIC 933 int error; 934 935 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) { 936 937 /* 938 * Parse MADT LAPIC entries 939 */ 940 error = early_acpi_parse_madt_lapic_addr_ovr(); 941 if (!error) { 942 acpi_lapic = 1; 943 smp_found_config = 1; 944 } 945 if (error == -EINVAL) { 946 /* 947 * Dell Precision Workstation 410, 610 come here. 948 */ 949 printk(KERN_ERR PREFIX 950 "Invalid BIOS MADT, disabling ACPI\n"); 951 disable_acpi(); 952 } 953 } 954 #endif 955 } 956 957 static void __init acpi_process_madt(void) 958 { 959 #ifdef CONFIG_X86_LOCAL_APIC 960 int error; 961 962 if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) { 963 964 /* 965 * Parse MADT LAPIC entries 966 */ 967 error = acpi_parse_madt_lapic_entries(); 968 if (!error) { 969 acpi_lapic = 1; 970 971 #ifdef CONFIG_X86_GENERICARCH 972 generic_bigsmp_probe(); 973 #endif 974 /* 975 * Parse MADT IO-APIC entries 976 */ 977 error = acpi_parse_madt_ioapic_entries(); 978 if (!error) { 979 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC; 980 acpi_irq_balance_set(NULL); 981 acpi_ioapic = 1; 982 983 smp_found_config = 1; 984 setup_apic_routing(); 985 } 986 } 987 if (error == -EINVAL) { 988 /* 989 * Dell Precision Workstation 410, 610 come here. 990 */ 991 printk(KERN_ERR PREFIX 992 "Invalid BIOS MADT, disabling ACPI\n"); 993 disable_acpi(); 994 } 995 } 996 #endif 997 return; 998 } 999 1000 #ifdef __i386__ 1001 1002 static int __init disable_acpi_irq(const struct dmi_system_id *d) 1003 { 1004 if (!acpi_force) { 1005 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n", 1006 d->ident); 1007 acpi_noirq_set(); 1008 } 1009 return 0; 1010 } 1011 1012 static int __init disable_acpi_pci(const struct dmi_system_id *d) 1013 { 1014 if (!acpi_force) { 1015 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n", 1016 d->ident); 1017 acpi_disable_pci(); 1018 } 1019 return 0; 1020 } 1021 1022 static int __init dmi_disable_acpi(const struct dmi_system_id *d) 1023 { 1024 if (!acpi_force) { 1025 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident); 1026 disable_acpi(); 1027 } else { 1028 printk(KERN_NOTICE 1029 "Warning: DMI blacklist says broken, but acpi forced\n"); 1030 } 1031 return 0; 1032 } 1033 1034 /* 1035 * Limit ACPI to CPU enumeration for HT 1036 */ 1037 static int __init force_acpi_ht(const struct dmi_system_id *d) 1038 { 1039 if (!acpi_force) { 1040 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n", 1041 d->ident); 1042 disable_acpi(); 1043 acpi_ht = 1; 1044 } else { 1045 printk(KERN_NOTICE 1046 "Warning: acpi=force overrules DMI blacklist: acpi=ht\n"); 1047 } 1048 return 0; 1049 } 1050 1051 /* 1052 * If your system is blacklisted here, but you find that acpi=force 1053 * works for you, please contact acpi-devel@sourceforge.net 1054 */ 1055 static struct dmi_system_id __initdata acpi_dmi_table[] = { 1056 /* 1057 * Boxes that need ACPI disabled 1058 */ 1059 { 1060 .callback = dmi_disable_acpi, 1061 .ident = "IBM Thinkpad", 1062 .matches = { 1063 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), 1064 DMI_MATCH(DMI_BOARD_NAME, "2629H1G"), 1065 }, 1066 }, 1067 1068 /* 1069 * Boxes that need acpi=ht 1070 */ 1071 { 1072 .callback = force_acpi_ht, 1073 .ident = "FSC Primergy T850", 1074 .matches = { 1075 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 1076 DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"), 1077 }, 1078 }, 1079 { 1080 .callback = force_acpi_ht, 1081 .ident = "HP VISUALIZE NT Workstation", 1082 .matches = { 1083 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"), 1084 DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"), 1085 }, 1086 }, 1087 { 1088 .callback = force_acpi_ht, 1089 .ident = "Compaq Workstation W8000", 1090 .matches = { 1091 DMI_MATCH(DMI_SYS_VENDOR, "Compaq"), 1092 DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"), 1093 }, 1094 }, 1095 { 1096 .callback = force_acpi_ht, 1097 .ident = "ASUS P4B266", 1098 .matches = { 1099 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), 1100 DMI_MATCH(DMI_BOARD_NAME, "P4B266"), 1101 }, 1102 }, 1103 { 1104 .callback = force_acpi_ht, 1105 .ident = "ASUS P2B-DS", 1106 .matches = { 1107 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), 1108 DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"), 1109 }, 1110 }, 1111 { 1112 .callback = force_acpi_ht, 1113 .ident = "ASUS CUR-DLS", 1114 .matches = { 1115 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), 1116 DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"), 1117 }, 1118 }, 1119 { 1120 .callback = force_acpi_ht, 1121 .ident = "ABIT i440BX-W83977", 1122 .matches = { 1123 DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"), 1124 DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"), 1125 }, 1126 }, 1127 { 1128 .callback = force_acpi_ht, 1129 .ident = "IBM Bladecenter", 1130 .matches = { 1131 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), 1132 DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"), 1133 }, 1134 }, 1135 { 1136 .callback = force_acpi_ht, 1137 .ident = "IBM eServer xSeries 360", 1138 .matches = { 1139 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), 1140 DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"), 1141 }, 1142 }, 1143 { 1144 .callback = force_acpi_ht, 1145 .ident = "IBM eserver xSeries 330", 1146 .matches = { 1147 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), 1148 DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"), 1149 }, 1150 }, 1151 { 1152 .callback = force_acpi_ht, 1153 .ident = "IBM eserver xSeries 440", 1154 .matches = { 1155 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), 1156 DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"), 1157 }, 1158 }, 1159 1160 /* 1161 * Boxes that need ACPI PCI IRQ routing disabled 1162 */ 1163 { 1164 .callback = disable_acpi_irq, 1165 .ident = "ASUS A7V", 1166 .matches = { 1167 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"), 1168 DMI_MATCH(DMI_BOARD_NAME, "<A7V>"), 1169 /* newer BIOS, Revision 1011, does work */ 1170 DMI_MATCH(DMI_BIOS_VERSION, 1171 "ASUS A7V ACPI BIOS Revision 1007"), 1172 }, 1173 }, 1174 { 1175 /* 1176 * Latest BIOS for IBM 600E (1.16) has bad pcinum 1177 * for LPC bridge, which is needed for the PCI 1178 * interrupt links to work. DSDT fix is in bug 5966. 1179 * 2645, 2646 model numbers are shared with 600/600E/600X 1180 */ 1181 .callback = disable_acpi_irq, 1182 .ident = "IBM Thinkpad 600 Series 2645", 1183 .matches = { 1184 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), 1185 DMI_MATCH(DMI_BOARD_NAME, "2645"), 1186 }, 1187 }, 1188 { 1189 .callback = disable_acpi_irq, 1190 .ident = "IBM Thinkpad 600 Series 2646", 1191 .matches = { 1192 DMI_MATCH(DMI_BOARD_VENDOR, "IBM"), 1193 DMI_MATCH(DMI_BOARD_NAME, "2646"), 1194 }, 1195 }, 1196 /* 1197 * Boxes that need ACPI PCI IRQ routing and PCI scan disabled 1198 */ 1199 { /* _BBN 0 bug */ 1200 .callback = disable_acpi_pci, 1201 .ident = "ASUS PR-DLS", 1202 .matches = { 1203 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), 1204 DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"), 1205 DMI_MATCH(DMI_BIOS_VERSION, 1206 "ASUS PR-DLS ACPI BIOS Revision 1010"), 1207 DMI_MATCH(DMI_BIOS_DATE, "03/21/2003") 1208 }, 1209 }, 1210 { 1211 .callback = disable_acpi_pci, 1212 .ident = "Acer TravelMate 36x Laptop", 1213 .matches = { 1214 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1215 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"), 1216 }, 1217 }, 1218 {} 1219 }; 1220 1221 #endif /* __i386__ */ 1222 1223 /* 1224 * acpi_boot_table_init() and acpi_boot_init() 1225 * called from setup_arch(), always. 1226 * 1. checksums all tables 1227 * 2. enumerates lapics 1228 * 3. enumerates io-apics 1229 * 1230 * acpi_table_init() is separate to allow reading SRAT without 1231 * other side effects. 1232 * 1233 * side effects of acpi_boot_init: 1234 * acpi_lapic = 1 if LAPIC found 1235 * acpi_ioapic = 1 if IOAPIC found 1236 * if (acpi_lapic && acpi_ioapic) smp_found_config = 1; 1237 * if acpi_blacklisted() acpi_disabled = 1; 1238 * acpi_irq_model=... 1239 * ... 1240 * 1241 * return value: (currently ignored) 1242 * 0: success 1243 * !0: failure 1244 */ 1245 1246 int __init acpi_boot_table_init(void) 1247 { 1248 int error; 1249 1250 #ifdef __i386__ 1251 dmi_check_system(acpi_dmi_table); 1252 #endif 1253 1254 /* 1255 * If acpi_disabled, bail out 1256 * One exception: acpi=ht continues far enough to enumerate LAPICs 1257 */ 1258 if (acpi_disabled && !acpi_ht) 1259 return 1; 1260 1261 /* 1262 * Initialize the ACPI boot-time table parser. 1263 */ 1264 error = acpi_table_init(); 1265 if (error) { 1266 disable_acpi(); 1267 return error; 1268 } 1269 1270 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf); 1271 1272 /* 1273 * blacklist may disable ACPI entirely 1274 */ 1275 error = acpi_blacklisted(); 1276 if (error) { 1277 if (acpi_force) { 1278 printk(KERN_WARNING PREFIX "acpi=force override\n"); 1279 } else { 1280 printk(KERN_WARNING PREFIX "Disabling ACPI support\n"); 1281 disable_acpi(); 1282 return error; 1283 } 1284 } 1285 1286 return 0; 1287 } 1288 1289 int __init early_acpi_boot_init(void) 1290 { 1291 /* 1292 * If acpi_disabled, bail out 1293 * One exception: acpi=ht continues far enough to enumerate LAPICs 1294 */ 1295 if (acpi_disabled && !acpi_ht) 1296 return 1; 1297 1298 /* 1299 * Process the Multiple APIC Description Table (MADT), if present 1300 */ 1301 early_acpi_process_madt(); 1302 1303 return 0; 1304 } 1305 1306 int __init acpi_boot_init(void) 1307 { 1308 /* 1309 * If acpi_disabled, bail out 1310 * One exception: acpi=ht continues far enough to enumerate LAPICs 1311 */ 1312 if (acpi_disabled && !acpi_ht) 1313 return 1; 1314 1315 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf); 1316 1317 /* 1318 * set sci_int and PM timer address 1319 */ 1320 acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt); 1321 1322 /* 1323 * Process the Multiple APIC Description Table (MADT), if present 1324 */ 1325 acpi_process_madt(); 1326 1327 acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet); 1328 1329 return 0; 1330 } 1331 1332 static int __init parse_acpi(char *arg) 1333 { 1334 if (!arg) 1335 return -EINVAL; 1336 1337 /* "acpi=off" disables both ACPI table parsing and interpreter */ 1338 if (strcmp(arg, "off") == 0) { 1339 disable_acpi(); 1340 } 1341 /* acpi=force to over-ride black-list */ 1342 else if (strcmp(arg, "force") == 0) { 1343 acpi_force = 1; 1344 acpi_ht = 1; 1345 acpi_disabled = 0; 1346 } 1347 /* acpi=strict disables out-of-spec workarounds */ 1348 else if (strcmp(arg, "strict") == 0) { 1349 acpi_strict = 1; 1350 } 1351 /* Limit ACPI just to boot-time to enable HT */ 1352 else if (strcmp(arg, "ht") == 0) { 1353 if (!acpi_force) 1354 disable_acpi(); 1355 acpi_ht = 1; 1356 } 1357 /* "acpi=noirq" disables ACPI interrupt routing */ 1358 else if (strcmp(arg, "noirq") == 0) { 1359 acpi_noirq_set(); 1360 } else { 1361 /* Core will printk when we return error. */ 1362 return -EINVAL; 1363 } 1364 return 0; 1365 } 1366 early_param("acpi", parse_acpi); 1367 1368 /* FIXME: Using pci= for an ACPI parameter is a travesty. */ 1369 static int __init parse_pci(char *arg) 1370 { 1371 if (arg && strcmp(arg, "noacpi") == 0) 1372 acpi_disable_pci(); 1373 return 0; 1374 } 1375 early_param("pci", parse_pci); 1376 1377 #ifdef CONFIG_X86_IO_APIC 1378 static int __init parse_acpi_skip_timer_override(char *arg) 1379 { 1380 acpi_skip_timer_override = 1; 1381 return 0; 1382 } 1383 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override); 1384 1385 static int __init parse_acpi_use_timer_override(char *arg) 1386 { 1387 acpi_use_timer_override = 1; 1388 return 0; 1389 } 1390 early_param("acpi_use_timer_override", parse_acpi_use_timer_override); 1391 #endif /* CONFIG_X86_IO_APIC */ 1392 1393 static int __init setup_acpi_sci(char *s) 1394 { 1395 if (!s) 1396 return -EINVAL; 1397 if (!strcmp(s, "edge")) 1398 acpi_sci_flags = ACPI_MADT_TRIGGER_EDGE | 1399 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK); 1400 else if (!strcmp(s, "level")) 1401 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL | 1402 (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK); 1403 else if (!strcmp(s, "high")) 1404 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH | 1405 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK); 1406 else if (!strcmp(s, "low")) 1407 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW | 1408 (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK); 1409 else 1410 return -EINVAL; 1411 return 0; 1412 } 1413 early_param("acpi_sci", setup_acpi_sci); 1414 1415 int __acpi_acquire_global_lock(unsigned int *lock) 1416 { 1417 unsigned int old, new, val; 1418 do { 1419 old = *lock; 1420 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1)); 1421 val = cmpxchg(lock, old, new); 1422 } while (unlikely (val != old)); 1423 return (new < 3) ? -1 : 0; 1424 } 1425 1426 int __acpi_release_global_lock(unsigned int *lock) 1427 { 1428 unsigned int old, new, val; 1429 do { 1430 old = *lock; 1431 new = old & ~0x3; 1432 val = cmpxchg(lock, old, new); 1433 } while (unlikely (val != old)); 1434 return old & 0x1; 1435 } 1436