arch/x86/kernel/acpi/boot.c

   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         if (!hpet_res)
 701                 return 0;
 702
 703         memset(hpet_res, 0, sizeof(*hpet_res));
 704         hpet_res->name = (void *)&hpet_res[1];
 705         hpet_res->flags = IORESOURCE_MEM;
 706         snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
 707                  hpet_tbl->sequence);
 708
 709         hpet_res->start = hpet_address;
 710         hpet_res->end = hpet_address + (1 * 1024) - 1;
 711
 712         return 0;
 713 }
 714
 715 /*
 716  * hpet_insert_resource inserts the HPET resources used into the resource
 717  * tree.
 718  */
 719 static __init int hpet_insert_resource(void)
 720 {
 721         if (!hpet_res)
 722                 return 1;
 723
 724         return insert_resource(&iomem_resource, hpet_res);
 725 }
 726
 727 late_initcall(hpet_insert_resource);
 728
 729 #else
 730 #define acpi_parse_hpet NULL
 731 #endif
 732
 733 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 734 {
 735
 736 #ifdef CONFIG_X86_PM_TIMER
 737         /* detect the location of the ACPI PM Timer */
 738         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
 739                 /* FADT rev. 2 */
 740                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
 741                     ACPI_ADR_SPACE_SYSTEM_IO)
 742                         return 0;
 743
 744                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
 745                 /*
 746                  * "X" fields are optional extensions to the original V1.0
 747                  * fields, so we must selectively expand V1.0 fields if the
 748                  * corresponding X field is zero.
 749                  */
 750                 if (!pmtmr_ioport)
 751                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 752         } else {
 753                 /* FADT rev. 1 */
 754                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 755         }
 756         if (pmtmr_ioport)
 757                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 758                        pmtmr_ioport);
 759 #endif
 760         return 0;
 761 }
 762
 763 #ifdef  CONFIG_X86_LOCAL_APIC
 764 /*
 765  * Parse LAPIC entries in MADT
 766  * returns 0 on success, < 0 on error
 767  */
 768
 769 static void __init acpi_register_lapic_address(unsigned long address)
 770 {
 771         mp_lapic_addr = address;
 772
 773         set_fixmap_nocache(FIX_APIC_BASE, address);
 774         if (boot_cpu_physical_apicid == -1U)
 775                 boot_cpu_physical_apicid  = GET_APIC_ID(read_apic_id());
 776 }
 777
 778 static int __init acpi_parse_madt_lapic_entries(void)
 779 {
 780         int count;
 781
 782         if (!cpu_has_apic)
 783                 return -ENODEV;
 784
 785         /*
 786          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 787          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 788          */
 789
 790         count =
 791             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
 792                                   acpi_parse_lapic_addr_ovr, 0);
 793         if (count < 0) {
 794                 printk(KERN_ERR PREFIX
 795                        "Error parsing LAPIC address override entry\n");
 796                 return count;
 797         }
 798
 799         acpi_register_lapic_address(acpi_lapic_addr);
 800
 801         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
 802                                       acpi_parse_sapic, MAX_APICS);
 803
 804         if (!count)
 805                 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
 806                                               acpi_parse_lapic, MAX_APICS);
 807         if (!count) {
 808                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 809                 /* TBD: Cleanup to allow fallback to MPS */
 810                 return -ENODEV;
 811         } else if (count < 0) {
 812                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 813                 /* TBD: Cleanup to allow fallback to MPS */
 814                 return count;
 815         }
 816
 817         count =
 818             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
 819         if (count < 0) {
 820                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 821                 /* TBD: Cleanup to allow fallback to MPS */
 822                 return count;
 823         }
 824         return 0;
 825 }
 826 #endif                          /* CONFIG_X86_LOCAL_APIC */
 827
 828 #ifdef  CONFIG_X86_IO_APIC
 829 /*
 830  * Parse IOAPIC related entries in MADT
 831  * returns 0 on success, < 0 on error
 832  */
 833 static int __init acpi_parse_madt_ioapic_entries(void)
 834 {
 835         int count;
 836
 837         /*
 838          * ACPI interpreter is required to complete interrupt setup,
 839          * so if it is off, don't enumerate the io-apics with ACPI.
 840          * If MPS is present, it will handle them,
 841          * otherwise the system will stay in PIC mode
 842          */
 843         if (acpi_disabled || acpi_noirq) {
 844                 return -ENODEV;
 845         }
 846
 847         if (!cpu_has_apic)
 848                 return -ENODEV;
 849
 850         /*
 851          * if "noapic" boot option, don't look for IO-APICs
 852          */
 853         if (skip_ioapic_setup) {
 854                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 855                        "due to 'noapic' option.\n");
 856                 return -ENODEV;
 857         }
 858
 859         count =
 860             acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
 861                                   MAX_IO_APICS);
 862         if (!count) {
 863                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 864                 return -ENODEV;
 865         } else if (count < 0) {
 866                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 867                 return count;
 868         }
 869
 870         count =
 871             acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
 872                                   NR_IRQ_VECTORS);
 873         if (count < 0) {
 874                 printk(KERN_ERR PREFIX
 875                        "Error parsing interrupt source overrides entry\n");
 876                 /* TBD: Cleanup to allow fallback to MPS */
 877                 return count;
 878         }
 879
 880         /*
 881          * If BIOS did not supply an INT_SRC_OVR for the SCI
 882          * pretend we got one so we can set the SCI flags.
 883          */
 884         if (!acpi_sci_override_gsi)
 885                 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
 886
 887         /* Fill in identity legacy mapings where no override */
 888         mp_config_acpi_legacy_irqs();
 889
 890         count =
 891             acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
 892                                   NR_IRQ_VECTORS);
 893         if (count < 0) {
 894                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 895                 /* TBD: Cleanup to allow fallback to MPS */
 896                 return count;
 897         }
 898
 899         return 0;
 900 }
 901 #else
 902 static inline int acpi_parse_madt_ioapic_entries(void)
 903 {
 904         return -1;
 905 }
 906 #endif  /* !CONFIG_X86_IO_APIC */
 907
 908 static void __init acpi_process_madt(void)
 909 {
 910 #ifdef CONFIG_X86_LOCAL_APIC
 911         int error;
 912
 913         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 914
 915                 /*
 916                  * Parse MADT LAPIC entries
 917                  */
 918                 error = acpi_parse_madt_lapic_entries();
 919                 if (!error) {
 920                         acpi_lapic = 1;
 921
 922 #ifdef CONFIG_X86_GENERICARCH
 923                         generic_bigsmp_probe();
 924 #endif
 925                         /*
 926                          * Parse MADT IO-APIC entries
 927                          */
 928                         error = acpi_parse_madt_ioapic_entries();
 929                         if (!error) {
 930                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 931                                 acpi_irq_balance_set(NULL);
 932                                 acpi_ioapic = 1;
 933
 934                                 smp_found_config = 1;
 935                                 setup_apic_routing();
 936                         }
 937                 }
 938                 if (error == -EINVAL) {
 939                         /*
 940                          * Dell Precision Workstation 410, 610 come here.
 941                          */
 942                         printk(KERN_ERR PREFIX
 943                                "Invalid BIOS MADT, disabling ACPI\n");
 944                         disable_acpi();
 945                 }
 946         }
 947 #endif
 948         return;
 949 }
 950
 951 #ifdef __i386__
 952
 953 static int __init disable_acpi_irq(const struct dmi_system_id *d)
 954 {
 955         if (!acpi_force) {
 956                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
 957                        d->ident);
 958                 acpi_noirq_set();
 959         }
 960         return 0;
 961 }
 962
 963 static int __init disable_acpi_pci(const struct dmi_system_id *d)
 964 {
 965         if (!acpi_force) {
 966                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
 967                        d->ident);
 968                 acpi_disable_pci();
 969         }
 970         return 0;
 971 }
 972
 973 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
 974 {
 975         if (!acpi_force) {
 976                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
 977                 disable_acpi();
 978         } else {
 979                 printk(KERN_NOTICE
 980                        "Warning: DMI blacklist says broken, but acpi forced\n");
 981         }
 982         return 0;
 983 }
 984
 985 /*
 986  * Limit ACPI to CPU enumeration for HT
 987  */
 988 static int __init force_acpi_ht(const struct dmi_system_id *d)
 989 {
 990         if (!acpi_force) {
 991                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
 992                        d->ident);
 993                 disable_acpi();
 994                 acpi_ht = 1;
 995         } else {
 996                 printk(KERN_NOTICE
 997                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
 998         }
 999         return 0;
1000 }
1001
1002 /*
1003  * If your system is blacklisted here, but you find that acpi=force
1004  * works for you, please contact acpi-devel@sourceforge.net
1005  */
1006 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1007         /*
1008          * Boxes that need ACPI disabled
1009          */
1010         {
1011          .callback = dmi_disable_acpi,
1012          .ident = "IBM Thinkpad",
1013          .matches = {
1014                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1015                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1016                      },
1017          },
1018
1019         /*
1020          * Boxes that need acpi=ht
1021          */
1022         {
1023          .callback = force_acpi_ht,
1024          .ident = "FSC Primergy T850",
1025          .matches = {
1026                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1027                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
1028                      },
1029          },
1030         {
1031          .callback = force_acpi_ht,
1032          .ident = "HP VISUALIZE NT Workstation",
1033          .matches = {
1034                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1035                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1036                      },
1037          },
1038         {
1039          .callback = force_acpi_ht,
1040          .ident = "Compaq Workstation W8000",
1041          .matches = {
1042                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1043                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1044                      },
1045          },
1046         {
1047          .callback = force_acpi_ht,
1048          .ident = "ASUS P4B266",
1049          .matches = {
1050                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1051                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1052                      },
1053          },
1054         {
1055          .callback = force_acpi_ht,
1056          .ident = "ASUS P2B-DS",
1057          .matches = {
1058                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1059                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1060                      },
1061          },
1062         {
1063          .callback = force_acpi_ht,
1064          .ident = "ASUS CUR-DLS",
1065          .matches = {
1066                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1067                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1068                      },
1069          },
1070         {
1071          .callback = force_acpi_ht,
1072          .ident = "ABIT i440BX-W83977",
1073          .matches = {
1074                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1075                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1076                      },
1077          },
1078         {
1079          .callback = force_acpi_ht,
1080          .ident = "IBM Bladecenter",
1081          .matches = {
1082                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1083                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1084                      },
1085          },
1086         {
1087          .callback = force_acpi_ht,
1088          .ident = "IBM eServer xSeries 360",
1089          .matches = {
1090                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1091                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1092                      },
1093          },
1094         {
1095          .callback = force_acpi_ht,
1096          .ident = "IBM eserver xSeries 330",
1097          .matches = {
1098                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1099                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1100                      },
1101          },
1102         {
1103          .callback = force_acpi_ht,
1104          .ident = "IBM eserver xSeries 440",
1105          .matches = {
1106                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1107                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1108                      },
1109          },
1110
1111         /*
1112          * Boxes that need ACPI PCI IRQ routing disabled
1113          */
1114         {
1115          .callback = disable_acpi_irq,
1116          .ident = "ASUS A7V",
1117          .matches = {
1118                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1119                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1120                      /* newer BIOS, Revision 1011, does work */
1121                      DMI_MATCH(DMI_BIOS_VERSION,
1122                                "ASUS A7V ACPI BIOS Revision 1007"),
1123                      },
1124          },
1125         {
1126                 /*
1127                  * Latest BIOS for IBM 600E (1.16) has bad pcinum
1128                  * for LPC bridge, which is needed for the PCI
1129                  * interrupt links to work. DSDT fix is in bug 5966.
1130                  * 2645, 2646 model numbers are shared with 600/600E/600X
1131                  */
1132          .callback = disable_acpi_irq,
1133          .ident = "IBM Thinkpad 600 Series 2645",
1134          .matches = {
1135                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1136                      DMI_MATCH(DMI_BOARD_NAME, "2645"),
1137                      },
1138          },
1139         {
1140          .callback = disable_acpi_irq,
1141          .ident = "IBM Thinkpad 600 Series 2646",
1142          .matches = {
1143                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1144                      DMI_MATCH(DMI_BOARD_NAME, "2646"),
1145                      },
1146          },
1147         /*
1148          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1149          */
1150         {                       /* _BBN 0 bug */
1151          .callback = disable_acpi_pci,
1152          .ident = "ASUS PR-DLS",
1153          .matches = {
1154                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1155                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1156                      DMI_MATCH(DMI_BIOS_VERSION,
1157                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1158                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1159                      },
1160          },
1161         {
1162          .callback = disable_acpi_pci,
1163          .ident = "Acer TravelMate 36x Laptop",
1164          .matches = {
1165                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1166                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1167                      },
1168          },
1169         {}
1170 };
1171
1172 #endif                          /* __i386__ */
1173
1174 /*
1175  * acpi_boot_table_init() and acpi_boot_init()
1176  *  called from setup_arch(), always.
1177  *      1. checksums all tables
1178  *      2. enumerates lapics
1179  *      3. enumerates io-apics
1180  *
1181  * acpi_table_init() is separate to allow reading SRAT without
1182  * other side effects.
1183  *
1184  * side effects of acpi_boot_init:
1185  *      acpi_lapic = 1 if LAPIC found
1186  *      acpi_ioapic = 1 if IOAPIC found
1187  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1188  *      if acpi_blacklisted() acpi_disabled = 1;
1189  *      acpi_irq_model=...
1190  *      ...
1191  *
1192  * return value: (currently ignored)
1193  *      0: success
1194  *      !0: failure
1195  */
1196
1197 int __init acpi_boot_table_init(void)
1198 {
1199         int error;
1200
1201 #ifdef __i386__
1202         dmi_check_system(acpi_dmi_table);
1203 #endif
1204
1205         /*
1206          * If acpi_disabled, bail out
1207          * One exception: acpi=ht continues far enough to enumerate LAPICs
1208          */
1209         if (acpi_disabled && !acpi_ht)
1210                 return 1;
1211
1212         /*
1213          * Initialize the ACPI boot-time table parser.
1214          */
1215         error = acpi_table_init();
1216         if (error) {
1217                 disable_acpi();
1218                 return error;
1219         }
1220
1221         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1222
1223         /*
1224          * blacklist may disable ACPI entirely
1225          */
1226         error = acpi_blacklisted();
1227         if (error) {
1228                 if (acpi_force) {
1229                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1230                 } else {
1231                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1232                         disable_acpi();
1233                         return error;
1234                 }
1235         }
1236
1237         return 0;
1238 }
1239
1240 int __init acpi_boot_init(void)
1241 {
1242         /*
1243          * If acpi_disabled, bail out
1244          * One exception: acpi=ht continues far enough to enumerate LAPICs
1245          */
1246         if (acpi_disabled && !acpi_ht)
1247                 return 1;
1248
1249         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1250
1251         /*
1252          * set sci_int and PM timer address
1253          */
1254         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1255
1256         /*
1257          * Process the Multiple APIC Description Table (MADT), if present
1258          */
1259         acpi_process_madt();
1260
1261         acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1262
1263         return 0;
1264 }
1265
1266 static int __init parse_acpi(char *arg)
1267 {
1268         if (!arg)
1269                 return -EINVAL;
1270
1271         /* "acpi=off" disables both ACPI table parsing and interpreter */
1272         if (strcmp(arg, "off") == 0) {
1273                 disable_acpi();
1274         }
1275         /* acpi=force to over-ride black-list */
1276         else if (strcmp(arg, "force") == 0) {
1277                 acpi_force = 1;
1278                 acpi_ht = 1;
1279                 acpi_disabled = 0;
1280         }
1281         /* acpi=strict disables out-of-spec workarounds */
1282         else if (strcmp(arg, "strict") == 0) {
1283                 acpi_strict = 1;
1284         }
1285         /* Limit ACPI just to boot-time to enable HT */
1286         else if (strcmp(arg, "ht") == 0) {
1287                 if (!acpi_force)
1288                         disable_acpi();
1289                 acpi_ht = 1;
1290         }
1291         /* "acpi=noirq" disables ACPI interrupt routing */
1292         else if (strcmp(arg, "noirq") == 0) {
1293                 acpi_noirq_set();
1294         } else {
1295                 /* Core will printk when we return error. */
1296                 return -EINVAL;
1297         }
1298         return 0;
1299 }
1300 early_param("acpi", parse_acpi);
1301
1302 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1303 static int __init parse_pci(char *arg)
1304 {
1305         if (arg && strcmp(arg, "noacpi") == 0)
1306                 acpi_disable_pci();
1307         return 0;
1308 }
1309 early_param("pci", parse_pci);
1310
1311 #ifdef CONFIG_X86_IO_APIC
1312 static int __init parse_acpi_skip_timer_override(char *arg)
1313 {
1314         acpi_skip_timer_override = 1;
1315         return 0;
1316 }
1317 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1318
1319 static int __init parse_acpi_use_timer_override(char *arg)
1320 {
1321         acpi_use_timer_override = 1;
1322         return 0;
1323 }
1324 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1325 #endif /* CONFIG_X86_IO_APIC */
1326
1327 static int __init setup_acpi_sci(char *s)
1328 {
1329         if (!s)
1330                 return -EINVAL;
1331         if (!strcmp(s, "edge"))
1332                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1333                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1334         else if (!strcmp(s, "level"))
1335                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1336                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1337         else if (!strcmp(s, "high"))
1338                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1339                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1340         else if (!strcmp(s, "low"))
1341                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1342                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1343         else
1344                 return -EINVAL;
1345         return 0;
1346 }
1347 early_param("acpi_sci", setup_acpi_sci);
1348
1349 int __acpi_acquire_global_lock(unsigned int *lock)
1350 {
1351         unsigned int old, new, val;
1352         do {
1353                 old = *lock;
1354                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1355                 val = cmpxchg(lock, old, new);
1356         } while (unlikely (val != old));
1357         return (new < 3) ? -1 : 0;
1358 }
1359
1360 int __acpi_release_global_lock(unsigned int *lock)
1361 {
1362         unsigned int old, new, val;
1363         do {
1364                 old = *lock;
1365                 new = old & ~0x3;
1366                 val = cmpxchg(lock, old, new);
1367         } while (unlikely (val != old));
1368         return old & 0x1;
1369 }