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   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 static int __init
 335 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
 336 {
 337         struct acpi_madt_io_apic *ioapic = NULL;
 338
 339         ioapic = (struct acpi_madt_io_apic *)header;
 340
 341         if (BAD_MADT_ENTRY(ioapic, end))
 342                 return -EINVAL;
 343
 344         acpi_table_print_madt_entry(header);
 345
 346         mp_register_ioapic(ioapic->id,
 347                            ioapic->address, ioapic->global_irq_base);
 348
 349         return 0;
 350 }
 351
 352 /*
 353  * Parse Interrupt Source Override for the ACPI SCI
 354  */
 355 static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
 356 {
 357         if (trigger == 0)       /* compatible SCI trigger is level */
 358                 trigger = 3;
 359
 360         if (polarity == 0)      /* compatible SCI polarity is low */
 361                 polarity = 3;
 362
 363         /* Command-line over-ride via acpi_sci= */
 364         if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
 365                 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
 366
 367         if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
 368                 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
 369
 370         /*
 371          * mp_config_acpi_legacy_irqs() already setup IRQs < 16
 372          * If GSI is < 16, this will update its flags,
 373          * else it will create a new mp_irqs[] entry.
 374          */
 375         mp_override_legacy_irq(gsi, polarity, trigger, gsi);
 376
 377         /*
 378          * stash over-ride to indicate we've been here
 379          * and for later update of acpi_gbl_FADT
 380          */
 381         acpi_sci_override_gsi = gsi;
 382         return;
 383 }
 384
 385 static int __init
 386 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 387                        const unsigned long end)
 388 {
 389         struct acpi_madt_interrupt_override *intsrc = NULL;
 390
 391         intsrc = (struct acpi_madt_interrupt_override *)header;
 392
 393         if (BAD_MADT_ENTRY(intsrc, end))
 394                 return -EINVAL;
 395
 396         acpi_table_print_madt_entry(header);
 397
 398         if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
 399                 acpi_sci_ioapic_setup(intsrc->global_irq,
 400                                       intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 401                                       (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 402                 return 0;
 403         }
 404
 405         if (acpi_skip_timer_override &&
 406             intsrc->source_irq == 0 && intsrc->global_irq == 2) {
 407                 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
 408                 return 0;
 409         }
 410
 411         mp_override_legacy_irq(intsrc->source_irq,
 412                                 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 413                                 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
 414                                 intsrc->global_irq);
 415
 416         return 0;
 417 }
 418
 419 static int __init
 420 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 421 {
 422         struct acpi_madt_nmi_source *nmi_src = NULL;
 423
 424         nmi_src = (struct acpi_madt_nmi_source *)header;
 425
 426         if (BAD_MADT_ENTRY(nmi_src, end))
 427                 return -EINVAL;
 428
 429         acpi_table_print_madt_entry(header);
 430
 431         /* TBD: Support nimsrc entries? */
 432
 433         return 0;
 434 }
 435
 436 #endif                          /* CONFIG_X86_IO_APIC */
 437
 438 /*
 439  * acpi_pic_sci_set_trigger()
 440  *
 441  * use ELCR to set PIC-mode trigger type for SCI
 442  *
 443  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 444  * it may require Edge Trigger -- use "acpi_sci=edge"
 445  *
 446  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 447  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 448  * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
 449  * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
 450  */
 451
 452 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
 453 {
 454         unsigned int mask = 1 << irq;
 455         unsigned int old, new;
 456
 457         /* Real old ELCR mask */
 458         old = inb(0x4d0) | (inb(0x4d1) << 8);
 459
 460         /*
 461          * If we use ACPI to set PCI IRQs, then we should clear ELCR
 462          * since we will set it correctly as we enable the PCI irq
 463          * routing.
 464          */
 465         new = acpi_noirq ? old : 0;
 466
 467         /*
 468          * Update SCI information in the ELCR, it isn't in the PCI
 469          * routing tables..
 470          */
 471         switch (trigger) {
 472         case 1:         /* Edge - clear */
 473                 new &= ~mask;
 474                 break;
 475         case 3:         /* Level - set */
 476                 new |= mask;
 477                 break;
 478         }
 479
 480         if (old == new)
 481                 return;
 482
 483         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
 484         outb(new, 0x4d0);
 485         outb(new >> 8, 0x4d1);
 486 }
 487
 488 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 489 {
 490         *irq = gsi;
 491         return 0;
 492 }
 493
 494 /*
 495  * success: return IRQ number (>=0)
 496  * failure: return < 0
 497  */
 498 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 499 {
 500         unsigned int irq;
 501         unsigned int plat_gsi = gsi;
 502
 503 #ifdef CONFIG_PCI
 504         /*
 505          * Make sure all (legacy) PCI IRQs are set as level-triggered.
 506          */
 507         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
 508                 extern void eisa_set_level_irq(unsigned int irq);
 509
 510                 if (triggering == ACPI_LEVEL_SENSITIVE)
 511                         eisa_set_level_irq(gsi);
 512         }
 513 #endif
 514
 515 #ifdef CONFIG_X86_IO_APIC
 516         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
 517                 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
 518         }
 519 #endif
 520         acpi_gsi_to_irq(plat_gsi, &irq);
 521         return irq;
 522 }
 523
 524 /*
 525  *  ACPI based hotplug support for CPU
 526  */
 527 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 528
 529 static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
 530 {
 531         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 532         union acpi_object *obj;
 533         struct acpi_madt_local_apic *lapic;
 534         cpumask_t tmp_map, new_map;
 535         u8 physid;
 536         int cpu;
 537
 538         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 539                 return -EINVAL;
 540
 541         if (!buffer.length || !buffer.pointer)
 542                 return -EINVAL;
 543
 544         obj = buffer.pointer;
 545         if (obj->type != ACPI_TYPE_BUFFER ||
 546             obj->buffer.length < sizeof(*lapic)) {
 547                 kfree(buffer.pointer);
 548                 return -EINVAL;
 549         }
 550
 551         lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
 552
 553         if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
 554             !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
 555                 kfree(buffer.pointer);
 556                 return -EINVAL;
 557         }
 558
 559         physid = lapic->id;
 560
 561         kfree(buffer.pointer);
 562         buffer.length = ACPI_ALLOCATE_BUFFER;
 563         buffer.pointer = NULL;
 564
 565         tmp_map = cpu_present_map;
 566         acpi_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
 567
 568         /*
 569          * If mp_register_lapic successfully generates a new logical cpu
 570          * number, then the following will get us exactly what was mapped
 571          */
 572         cpus_andnot(new_map, cpu_present_map, tmp_map);
 573         if (cpus_empty(new_map)) {
 574                 printk ("Unable to map lapic to logical cpu number\n");
 575                 return -EINVAL;
 576         }
 577
 578         cpu = first_cpu(new_map);
 579
 580         *pcpu = cpu;
 581         return 0;
 582 }
 583
 584 /* wrapper to silence section mismatch warning */
 585 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
 586 {
 587         return _acpi_map_lsapic(handle, pcpu);
 588 }
 589 EXPORT_SYMBOL(acpi_map_lsapic);
 590
 591 int acpi_unmap_lsapic(int cpu)
 592 {
 593         per_cpu(x86_cpu_to_apicid, cpu) = -1;
 594         cpu_clear(cpu, cpu_present_map);
 595         num_processors--;
 596
 597         return (0);
 598 }
 599
 600 EXPORT_SYMBOL(acpi_unmap_lsapic);
 601 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 602
 603 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 604 {
 605         /* TBD */
 606         return -EINVAL;
 607 }
 608
 609 EXPORT_SYMBOL(acpi_register_ioapic);
 610
 611 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 612 {
 613         /* TBD */
 614         return -EINVAL;
 615 }
 616
 617 EXPORT_SYMBOL(acpi_unregister_ioapic);
 618
 619 static int __init acpi_parse_sbf(struct acpi_table_header *table)
 620 {
 621         struct acpi_table_boot *sb;
 622
 623         sb = (struct acpi_table_boot *)table;
 624         if (!sb) {
 625                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
 626                 return -ENODEV;
 627         }
 628
 629         sbf_port = sb->cmos_index;      /* Save CMOS port */
 630
 631         return 0;
 632 }
 633
 634 #ifdef CONFIG_HPET_TIMER
 635 #include <asm/hpet.h>
 636
 637 static struct __initdata resource *hpet_res;
 638
 639 static int __init acpi_parse_hpet(struct acpi_table_header *table)
 640 {
 641         struct acpi_table_hpet *hpet_tbl;
 642
 643         hpet_tbl = (struct acpi_table_hpet *)table;
 644         if (!hpet_tbl) {
 645                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
 646                 return -ENODEV;
 647         }
 648
 649         if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
 650                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 651                        "memory.\n");
 652                 return -1;
 653         }
 654
 655         hpet_address = hpet_tbl->address.address;
 656
 657         /*
 658          * Some broken BIOSes advertise HPET at 0x0. We really do not
 659          * want to allocate a resource there.
 660          */
 661         if (!hpet_address) {
 662                 printk(KERN_WARNING PREFIX
 663                        "HPET id: %#x base: %#lx is invalid\n",
 664                        hpet_tbl->id, hpet_address);
 665                 return 0;
 666         }
 667 #ifdef CONFIG_X86_64
 668         /*
 669          * Some even more broken BIOSes advertise HPET at
 670          * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
 671          * some noise:
 672          */
 673         if (hpet_address == 0xfed0000000000000UL) {
 674                 if (!hpet_force_user) {
 675                         printk(KERN_WARNING PREFIX "HPET id: %#x "
 676                                "base: 0xfed0000000000000 is bogus\n "
 677                                "try hpet=force on the kernel command line to "
 678                                "fix it up to 0xfed00000.\n", hpet_tbl->id);
 679                         hpet_address = 0;
 680                         return 0;
 681                 }
 682                 printk(KERN_WARNING PREFIX
 683                        "HPET id: %#x base: 0xfed0000000000000 fixed up "
 684                        "to 0xfed00000.\n", hpet_tbl->id);
 685                 hpet_address >>= 32;
 686         }
 687 #endif
 688         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 689                hpet_tbl->id, hpet_address);
 690
 691         /*
 692          * Allocate and initialize the HPET firmware resource for adding into
 693          * the resource tree during the lateinit timeframe.
 694          */
 695 #define HPET_RESOURCE_NAME_SIZE 9
 696         hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
 697
 698         hpet_res->name = (void *)&hpet_res[1];
 699         hpet_res->flags = IORESOURCE_MEM;
 700         snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
 701                  hpet_tbl->sequence);
 702
 703         hpet_res->start = hpet_address;
 704         hpet_res->end = hpet_address + (1 * 1024) - 1;
 705
 706         return 0;
 707 }
 708
 709 /*
 710  * hpet_insert_resource inserts the HPET resources used into the resource
 711  * tree.
 712  */
 713 static __init int hpet_insert_resource(void)
 714 {
 715         if (!hpet_res)
 716                 return 1;
 717
 718         return insert_resource(&iomem_resource, hpet_res);
 719 }
 720
 721 late_initcall(hpet_insert_resource);
 722
 723 #else
 724 #define acpi_parse_hpet NULL
 725 #endif
 726
 727 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 728 {
 729
 730 #ifdef CONFIG_X86_PM_TIMER
 731         /* detect the location of the ACPI PM Timer */
 732         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
 733                 /* FADT rev. 2 */
 734                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
 735                     ACPI_ADR_SPACE_SYSTEM_IO)
 736                         return 0;
 737
 738                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
 739                 /*
 740                  * "X" fields are optional extensions to the original V1.0
 741                  * fields, so we must selectively expand V1.0 fields if the
 742                  * corresponding X field is zero.
 743                  */
 744                 if (!pmtmr_ioport)
 745                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 746         } else {
 747                 /* FADT rev. 1 */
 748                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 749         }
 750         if (pmtmr_ioport)
 751                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 752                        pmtmr_ioport);
 753 #endif
 754         return 0;
 755 }
 756
 757 #ifdef  CONFIG_X86_LOCAL_APIC
 758 /*
 759  * Parse LAPIC entries in MADT
 760  * returns 0 on success, < 0 on error
 761  */
 762
 763 static void __init acpi_register_lapic_address(unsigned long address)
 764 {
 765         mp_lapic_addr = address;
 766
 767         set_fixmap_nocache(FIX_APIC_BASE, address);
 768         if (boot_cpu_physical_apicid == -1U)
 769                 boot_cpu_physical_apicid  = GET_APIC_ID(read_apic_id());
 770 }
 771
 772 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
 773 {
 774         int count;
 775
 776         if (!cpu_has_apic)
 777                 return -ENODEV;
 778
 779         /*
 780          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 781          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 782          */
 783
 784         count =
 785             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
 786                                   acpi_parse_lapic_addr_ovr, 0);
 787         if (count < 0) {
 788                 printk(KERN_ERR PREFIX
 789                        "Error parsing LAPIC address override entry\n");
 790                 return count;
 791         }
 792
 793         acpi_register_lapic_address(acpi_lapic_addr);
 794
 795         return count;
 796 }
 797
 798 static int __init acpi_parse_madt_lapic_entries(void)
 799 {
 800         int count;
 801
 802         if (!cpu_has_apic)
 803                 return -ENODEV;
 804
 805         /*
 806          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 807          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 808          */
 809
 810         count =
 811             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
 812                                   acpi_parse_lapic_addr_ovr, 0);
 813         if (count < 0) {
 814                 printk(KERN_ERR PREFIX
 815                        "Error parsing LAPIC address override entry\n");
 816                 return count;
 817         }
 818
 819         acpi_register_lapic_address(acpi_lapic_addr);
 820
 821         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
 822                                       acpi_parse_sapic, MAX_APICS);
 823
 824         if (!count)
 825                 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
 826                                               acpi_parse_lapic, MAX_APICS);
 827         if (!count) {
 828                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 829                 /* TBD: Cleanup to allow fallback to MPS */
 830                 return -ENODEV;
 831         } else if (count < 0) {
 832                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 833                 /* TBD: Cleanup to allow fallback to MPS */
 834                 return count;
 835         }
 836
 837         count =
 838             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
 839         if (count < 0) {
 840                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 841                 /* TBD: Cleanup to allow fallback to MPS */
 842                 return count;
 843         }
 844         return 0;
 845 }
 846 #endif                          /* CONFIG_X86_LOCAL_APIC */
 847
 848 #ifdef  CONFIG_X86_IO_APIC
 849 /*
 850  * Parse IOAPIC related entries in MADT
 851  * returns 0 on success, < 0 on error
 852  */
 853 static int __init acpi_parse_madt_ioapic_entries(void)
 854 {
 855         int count;
 856
 857         /*
 858          * ACPI interpreter is required to complete interrupt setup,
 859          * so if it is off, don't enumerate the io-apics with ACPI.
 860          * If MPS is present, it will handle them,
 861          * otherwise the system will stay in PIC mode
 862          */
 863         if (acpi_disabled || acpi_noirq) {
 864                 return -ENODEV;
 865         }
 866
 867         if (!cpu_has_apic)
 868                 return -ENODEV;
 869
 870         /*
 871          * if "noapic" boot option, don't look for IO-APICs
 872          */
 873         if (skip_ioapic_setup) {
 874                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 875                        "due to 'noapic' option.\n");
 876                 return -ENODEV;
 877         }
 878
 879         count =
 880             acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
 881                                   MAX_IO_APICS);
 882         if (!count) {
 883                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 884                 return -ENODEV;
 885         } else if (count < 0) {
 886                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 887                 return count;
 888         }
 889
 890         count =
 891             acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
 892                                   NR_IRQ_VECTORS);
 893         if (count < 0) {
 894                 printk(KERN_ERR PREFIX
 895                        "Error parsing interrupt source overrides entry\n");
 896                 /* TBD: Cleanup to allow fallback to MPS */
 897                 return count;
 898         }
 899
 900         /*
 901          * If BIOS did not supply an INT_SRC_OVR for the SCI
 902          * pretend we got one so we can set the SCI flags.
 903          */
 904         if (!acpi_sci_override_gsi)
 905                 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
 906
 907         /* Fill in identity legacy mapings where no override */
 908         mp_config_acpi_legacy_irqs();
 909
 910         count =
 911             acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
 912                                   NR_IRQ_VECTORS);
 913         if (count < 0) {
 914                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 915                 /* TBD: Cleanup to allow fallback to MPS */
 916                 return count;
 917         }
 918
 919         return 0;
 920 }
 921 #else
 922 static inline int acpi_parse_madt_ioapic_entries(void)
 923 {
 924         return -1;
 925 }
 926 #endif  /* !CONFIG_X86_IO_APIC */
 927
 928 static void __init early_acpi_process_madt(void)
 929 {
 930 #ifdef CONFIG_X86_LOCAL_APIC
 931         int error;
 932
 933         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 934
 935                 /*
 936                  * Parse MADT LAPIC entries
 937                  */
 938                 error = early_acpi_parse_madt_lapic_addr_ovr();
 939                 if (!error) {
 940                         acpi_lapic = 1;
 941                         smp_found_config = 1;
 942                 }
 943                 if (error == -EINVAL) {
 944                         /*
 945                          * Dell Precision Workstation 410, 610 come here.
 946                          */
 947                         printk(KERN_ERR PREFIX
 948                                "Invalid BIOS MADT, disabling ACPI\n");
 949                         disable_acpi();
 950                 }
 951         }
 952 #endif
 953 }
 954
 955 static void __init acpi_process_madt(void)
 956 {
 957 #ifdef CONFIG_X86_LOCAL_APIC
 958         int error;
 959
 960         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 961
 962                 /*
 963                  * Parse MADT LAPIC entries
 964                  */
 965                 error = acpi_parse_madt_lapic_entries();
 966                 if (!error) {
 967                         acpi_lapic = 1;
 968
 969 #ifdef CONFIG_X86_GENERICARCH
 970                         generic_bigsmp_probe();
 971 #endif
 972                         /*
 973                          * Parse MADT IO-APIC entries
 974                          */
 975                         error = acpi_parse_madt_ioapic_entries();
 976                         if (!error) {
 977                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 978                                 acpi_irq_balance_set(NULL);
 979                                 acpi_ioapic = 1;
 980
 981                                 smp_found_config = 1;
 982                                 setup_apic_routing();
 983                         }
 984                 }
 985                 if (error == -EINVAL) {
 986                         /*
 987                          * Dell Precision Workstation 410, 610 come here.
 988                          */
 989                         printk(KERN_ERR PREFIX
 990                                "Invalid BIOS MADT, disabling ACPI\n");
 991                         disable_acpi();
 992                 }
 993         }
 994 #endif
 995         return;
 996 }
 997
 998 #ifdef __i386__
 999
1000 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1001 {
1002         if (!acpi_force) {
1003                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1004                        d->ident);
1005                 acpi_noirq_set();
1006         }
1007         return 0;
1008 }
1009
1010 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1011 {
1012         if (!acpi_force) {
1013                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1014                        d->ident);
1015                 acpi_disable_pci();
1016         }
1017         return 0;
1018 }
1019
1020 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1021 {
1022         if (!acpi_force) {
1023                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1024                 disable_acpi();
1025         } else {
1026                 printk(KERN_NOTICE
1027                        "Warning: DMI blacklist says broken, but acpi forced\n");
1028         }
1029         return 0;
1030 }
1031
1032 /*
1033  * Limit ACPI to CPU enumeration for HT
1034  */
1035 static int __init force_acpi_ht(const struct dmi_system_id *d)
1036 {
1037         if (!acpi_force) {
1038                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
1039                        d->ident);
1040                 disable_acpi();
1041                 acpi_ht = 1;
1042         } else {
1043                 printk(KERN_NOTICE
1044                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
1045         }
1046         return 0;
1047 }
1048
1049 /*
1050  * If your system is blacklisted here, but you find that acpi=force
1051  * works for you, please contact acpi-devel@sourceforge.net
1052  */
1053 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1054         /*
1055          * Boxes that need ACPI disabled
1056          */
1057         {
1058          .callback = dmi_disable_acpi,
1059          .ident = "IBM Thinkpad",
1060          .matches = {
1061                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1062                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1063                      },
1064          },
1065
1066         /*
1067          * Boxes that need acpi=ht
1068          */
1069         {
1070          .callback = force_acpi_ht,
1071          .ident = "FSC Primergy T850",
1072          .matches = {
1073                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1074                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
1075                      },
1076          },
1077         {
1078          .callback = force_acpi_ht,
1079          .ident = "HP VISUALIZE NT Workstation",
1080          .matches = {
1081                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1082                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1083                      },
1084          },
1085         {
1086          .callback = force_acpi_ht,
1087          .ident = "Compaq Workstation W8000",
1088          .matches = {
1089                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1090                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1091                      },
1092          },
1093         {
1094          .callback = force_acpi_ht,
1095          .ident = "ASUS P4B266",
1096          .matches = {
1097                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1098                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1099                      },
1100          },
1101         {
1102          .callback = force_acpi_ht,
1103          .ident = "ASUS P2B-DS",
1104          .matches = {
1105                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1106                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1107                      },
1108          },
1109         {
1110          .callback = force_acpi_ht,
1111          .ident = "ASUS CUR-DLS",
1112          .matches = {
1113                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1114                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1115                      },
1116          },
1117         {
1118          .callback = force_acpi_ht,
1119          .ident = "ABIT i440BX-W83977",
1120          .matches = {
1121                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1122                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1123                      },
1124          },
1125         {
1126          .callback = force_acpi_ht,
1127          .ident = "IBM Bladecenter",
1128          .matches = {
1129                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1130                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1131                      },
1132          },
1133         {
1134          .callback = force_acpi_ht,
1135          .ident = "IBM eServer xSeries 360",
1136          .matches = {
1137                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1138                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1139                      },
1140          },
1141         {
1142          .callback = force_acpi_ht,
1143          .ident = "IBM eserver xSeries 330",
1144          .matches = {
1145                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1146                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1147                      },
1148          },
1149         {
1150          .callback = force_acpi_ht,
1151          .ident = "IBM eserver xSeries 440",
1152          .matches = {
1153                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1154                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1155                      },
1156          },
1157
1158         /*
1159          * Boxes that need ACPI PCI IRQ routing disabled
1160          */
1161         {
1162          .callback = disable_acpi_irq,
1163          .ident = "ASUS A7V",
1164          .matches = {
1165                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1166                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1167                      /* newer BIOS, Revision 1011, does work */
1168                      DMI_MATCH(DMI_BIOS_VERSION,
1169                                "ASUS A7V ACPI BIOS Revision 1007"),
1170                      },
1171          },
1172         {
1173                 /*
1174                  * Latest BIOS for IBM 600E (1.16) has bad pcinum
1175                  * for LPC bridge, which is needed for the PCI
1176                  * interrupt links to work. DSDT fix is in bug 5966.
1177                  * 2645, 2646 model numbers are shared with 600/600E/600X
1178                  */
1179          .callback = disable_acpi_irq,
1180          .ident = "IBM Thinkpad 600 Series 2645",
1181          .matches = {
1182                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1183                      DMI_MATCH(DMI_BOARD_NAME, "2645"),
1184                      },
1185          },
1186         {
1187          .callback = disable_acpi_irq,
1188          .ident = "IBM Thinkpad 600 Series 2646",
1189          .matches = {
1190                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1191                      DMI_MATCH(DMI_BOARD_NAME, "2646"),
1192                      },
1193          },
1194         /*
1195          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1196          */
1197         {                       /* _BBN 0 bug */
1198          .callback = disable_acpi_pci,
1199          .ident = "ASUS PR-DLS",
1200          .matches = {
1201                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1202                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1203                      DMI_MATCH(DMI_BIOS_VERSION,
1204                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1205                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1206                      },
1207          },
1208         {
1209          .callback = disable_acpi_pci,
1210          .ident = "Acer TravelMate 36x Laptop",
1211          .matches = {
1212                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1213                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1214                      },
1215          },
1216         {}
1217 };
1218
1219 #endif                          /* __i386__ */
1220
1221 /*
1222  * acpi_boot_table_init() and acpi_boot_init()
1223  *  called from setup_arch(), always.
1224  *      1. checksums all tables
1225  *      2. enumerates lapics
1226  *      3. enumerates io-apics
1227  *
1228  * acpi_table_init() is separate to allow reading SRAT without
1229  * other side effects.
1230  *
1231  * side effects of acpi_boot_init:
1232  *      acpi_lapic = 1 if LAPIC found
1233  *      acpi_ioapic = 1 if IOAPIC found
1234  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1235  *      if acpi_blacklisted() acpi_disabled = 1;
1236  *      acpi_irq_model=...
1237  *      ...
1238  *
1239  * return value: (currently ignored)
1240  *      0: success
1241  *      !0: failure
1242  */
1243
1244 int __init acpi_boot_table_init(void)
1245 {
1246         int error;
1247
1248 #ifdef __i386__
1249         dmi_check_system(acpi_dmi_table);
1250 #endif
1251
1252         /*
1253          * If acpi_disabled, bail out
1254          * One exception: acpi=ht continues far enough to enumerate LAPICs
1255          */
1256         if (acpi_disabled && !acpi_ht)
1257                 return 1;
1258
1259         /*
1260          * Initialize the ACPI boot-time table parser.
1261          */
1262         error = acpi_table_init();
1263         if (error) {
1264                 disable_acpi();
1265                 return error;
1266         }
1267
1268         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1269
1270         /*
1271          * blacklist may disable ACPI entirely
1272          */
1273         error = acpi_blacklisted();
1274         if (error) {
1275                 if (acpi_force) {
1276                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1277                 } else {
1278                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1279                         disable_acpi();
1280                         return error;
1281                 }
1282         }
1283
1284         return 0;
1285 }
1286
1287 int __init early_acpi_boot_init(void)
1288 {
1289         /*
1290          * If acpi_disabled, bail out
1291          * One exception: acpi=ht continues far enough to enumerate LAPICs
1292          */
1293         if (acpi_disabled && !acpi_ht)
1294                 return 1;
1295
1296         /*
1297          * Process the Multiple APIC Description Table (MADT), if present
1298          */
1299         early_acpi_process_madt();
1300
1301         return 0;
1302 }
1303
1304 int __init acpi_boot_init(void)
1305 {
1306         /*
1307          * If acpi_disabled, bail out
1308          * One exception: acpi=ht continues far enough to enumerate LAPICs
1309          */
1310         if (acpi_disabled && !acpi_ht)
1311                 return 1;
1312
1313         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1314
1315         /*
1316          * set sci_int and PM timer address
1317          */
1318         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1319
1320         /*
1321          * Process the Multiple APIC Description Table (MADT), if present
1322          */
1323         acpi_process_madt();
1324
1325         acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1326
1327         return 0;
1328 }
1329
1330 static int __init parse_acpi(char *arg)
1331 {
1332         if (!arg)
1333                 return -EINVAL;
1334
1335         /* "acpi=off" disables both ACPI table parsing and interpreter */
1336         if (strcmp(arg, "off") == 0) {
1337                 disable_acpi();
1338         }
1339         /* acpi=force to over-ride black-list */
1340         else if (strcmp(arg, "force") == 0) {
1341                 acpi_force = 1;
1342                 acpi_ht = 1;
1343                 acpi_disabled = 0;
1344         }
1345         /* acpi=strict disables out-of-spec workarounds */
1346         else if (strcmp(arg, "strict") == 0) {
1347                 acpi_strict = 1;
1348         }
1349         /* Limit ACPI just to boot-time to enable HT */
1350         else if (strcmp(arg, "ht") == 0) {
1351                 if (!acpi_force)
1352                         disable_acpi();
1353                 acpi_ht = 1;
1354         }
1355         /* "acpi=noirq" disables ACPI interrupt routing */
1356         else if (strcmp(arg, "noirq") == 0) {
1357                 acpi_noirq_set();
1358         } else {
1359                 /* Core will printk when we return error. */
1360                 return -EINVAL;
1361         }
1362         return 0;
1363 }
1364 early_param("acpi", parse_acpi);
1365
1366 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1367 static int __init parse_pci(char *arg)
1368 {
1369         if (arg && strcmp(arg, "noacpi") == 0)
1370                 acpi_disable_pci();
1371         return 0;
1372 }
1373 early_param("pci", parse_pci);
1374
1375 #ifdef CONFIG_X86_IO_APIC
1376 static int __init parse_acpi_skip_timer_override(char *arg)
1377 {
1378         acpi_skip_timer_override = 1;
1379         return 0;
1380 }
1381 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1382
1383 static int __init parse_acpi_use_timer_override(char *arg)
1384 {
1385         acpi_use_timer_override = 1;
1386         return 0;
1387 }
1388 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1389 #endif /* CONFIG_X86_IO_APIC */
1390
1391 static int __init setup_acpi_sci(char *s)
1392 {
1393         if (!s)
1394                 return -EINVAL;
1395         if (!strcmp(s, "edge"))
1396                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1397                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1398         else if (!strcmp(s, "level"))
1399                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1400                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1401         else if (!strcmp(s, "high"))
1402                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1403                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1404         else if (!strcmp(s, "low"))
1405                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1406                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1407         else
1408                 return -EINVAL;
1409         return 0;
1410 }
1411 early_param("acpi_sci", setup_acpi_sci);
1412
1413 int __acpi_acquire_global_lock(unsigned int *lock)
1414 {
1415         unsigned int old, new, val;
1416         do {
1417                 old = *lock;
1418                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1419                 val = cmpxchg(lock, old, new);
1420         } while (unlikely (val != old));
1421         return (new < 3) ? -1 : 0;
1422 }
1423
1424 int __acpi_release_global_lock(unsigned int *lock)
1425 {
1426         unsigned int old, new, val;
1427         do {
1428                 old = *lock;
1429                 new = old & ~0x3;
1430                 val = cmpxchg(lock, old, new);
1431         } while (unlikely (val != old));
1432         return old & 0x1;
1433 }