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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         unsigned int ver = 0;
 246
 247         if (!enabled) {
 248                 ++disabled_cpus;
 249                 return;
 250         }
 251
 252 #ifdef CONFIG_X86_32
 253         if (boot_cpu_physical_apicid != -1U)
 254                 ver = apic_version[boot_cpu_physical_apicid];
 255 #endif
 256
 257         generic_processor_info(id, ver);
 258 }
 259
 260 static int __init
 261 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
 262 {
 263         struct acpi_madt_local_apic *processor = NULL;
 264
 265         processor = (struct acpi_madt_local_apic *)header;
 266
 267         if (BAD_MADT_ENTRY(processor, end))
 268                 return -EINVAL;
 269
 270         acpi_table_print_madt_entry(header);
 271
 272         /*
 273          * We need to register disabled CPU as well to permit
 274          * counting disabled CPUs. This allows us to size
 275          * cpus_possible_map more accurately, to permit
 276          * to not preallocating memory for all NR_CPUS
 277          * when we use CPU hotplug.
 278          */
 279         acpi_register_lapic(processor->id,      /* APIC ID */
 280                             processor->lapic_flags & ACPI_MADT_ENABLED);
 281
 282         return 0;
 283 }
 284
 285 static int __init
 286 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
 287 {
 288         struct acpi_madt_local_sapic *processor = NULL;
 289
 290         processor = (struct acpi_madt_local_sapic *)header;
 291
 292         if (BAD_MADT_ENTRY(processor, end))
 293                 return -EINVAL;
 294
 295         acpi_table_print_madt_entry(header);
 296
 297         acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
 298                             processor->lapic_flags & ACPI_MADT_ENABLED);
 299
 300         return 0;
 301 }
 302
 303 static int __init
 304 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 305                           const unsigned long end)
 306 {
 307         struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
 308
 309         lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
 310
 311         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
 312                 return -EINVAL;
 313
 314         acpi_lapic_addr = lapic_addr_ovr->address;
 315
 316         return 0;
 317 }
 318
 319 static int __init
 320 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 321 {
 322         struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
 323
 324         lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
 325
 326         if (BAD_MADT_ENTRY(lapic_nmi, end))
 327                 return -EINVAL;
 328
 329         acpi_table_print_madt_entry(header);
 330
 331         if (lapic_nmi->lint != 1)
 332                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
 333
 334         return 0;
 335 }
 336
 337 #endif                          /*CONFIG_X86_LOCAL_APIC */
 338
 339 #ifdef CONFIG_X86_IO_APIC
 340
 341 struct mp_ioapic_routing mp_ioapic_routing[MAX_IO_APICS];
 342
 343 static int __init
 344 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
 345 {
 346         struct acpi_madt_io_apic *ioapic = NULL;
 347
 348         ioapic = (struct acpi_madt_io_apic *)header;
 349
 350         if (BAD_MADT_ENTRY(ioapic, end))
 351                 return -EINVAL;
 352
 353         acpi_table_print_madt_entry(header);
 354
 355         mp_register_ioapic(ioapic->id,
 356                            ioapic->address, ioapic->global_irq_base);
 357
 358         return 0;
 359 }
 360
 361 /*
 362  * Parse Interrupt Source Override for the ACPI SCI
 363  */
 364 static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
 365 {
 366         if (trigger == 0)       /* compatible SCI trigger is level */
 367                 trigger = 3;
 368
 369         if (polarity == 0)      /* compatible SCI polarity is low */
 370                 polarity = 3;
 371
 372         /* Command-line over-ride via acpi_sci= */
 373         if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
 374                 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
 375
 376         if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
 377                 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
 378
 379         /*
 380          * mp_config_acpi_legacy_irqs() already setup IRQs < 16
 381          * If GSI is < 16, this will update its flags,
 382          * else it will create a new mp_irqs[] entry.
 383          */
 384         mp_override_legacy_irq(gsi, polarity, trigger, gsi);
 385
 386         /*
 387          * stash over-ride to indicate we've been here
 388          * and for later update of acpi_gbl_FADT
 389          */
 390         acpi_sci_override_gsi = gsi;
 391         return;
 392 }
 393
 394 static int __init
 395 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 396                        const unsigned long end)
 397 {
 398         struct acpi_madt_interrupt_override *intsrc = NULL;
 399
 400         intsrc = (struct acpi_madt_interrupt_override *)header;
 401
 402         if (BAD_MADT_ENTRY(intsrc, end))
 403                 return -EINVAL;
 404
 405         acpi_table_print_madt_entry(header);
 406
 407         if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
 408                 acpi_sci_ioapic_setup(intsrc->global_irq,
 409                                       intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 410                                       (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 411                 return 0;
 412         }
 413
 414         if (acpi_skip_timer_override &&
 415             intsrc->source_irq == 0 && intsrc->global_irq == 2) {
 416                 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
 417                 return 0;
 418         }
 419
 420         mp_override_legacy_irq(intsrc->source_irq,
 421                                 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 422                                 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
 423                                 intsrc->global_irq);
 424
 425         return 0;
 426 }
 427
 428 static int __init
 429 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 430 {
 431         struct acpi_madt_nmi_source *nmi_src = NULL;
 432
 433         nmi_src = (struct acpi_madt_nmi_source *)header;
 434
 435         if (BAD_MADT_ENTRY(nmi_src, end))
 436                 return -EINVAL;
 437
 438         acpi_table_print_madt_entry(header);
 439
 440         /* TBD: Support nimsrc entries? */
 441
 442         return 0;
 443 }
 444
 445 #endif                          /* CONFIG_X86_IO_APIC */
 446
 447 /*
 448  * acpi_pic_sci_set_trigger()
 449  *
 450  * use ELCR to set PIC-mode trigger type for SCI
 451  *
 452  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 453  * it may require Edge Trigger -- use "acpi_sci=edge"
 454  *
 455  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 456  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 457  * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
 458  * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
 459  */
 460
 461 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
 462 {
 463         unsigned int mask = 1 << irq;
 464         unsigned int old, new;
 465
 466         /* Real old ELCR mask */
 467         old = inb(0x4d0) | (inb(0x4d1) << 8);
 468
 469         /*
 470          * If we use ACPI to set PCI IRQs, then we should clear ELCR
 471          * since we will set it correctly as we enable the PCI irq
 472          * routing.
 473          */
 474         new = acpi_noirq ? old : 0;
 475
 476         /*
 477          * Update SCI information in the ELCR, it isn't in the PCI
 478          * routing tables..
 479          */
 480         switch (trigger) {
 481         case 1:         /* Edge - clear */
 482                 new &= ~mask;
 483                 break;
 484         case 3:         /* Level - set */
 485                 new |= mask;
 486                 break;
 487         }
 488
 489         if (old == new)
 490                 return;
 491
 492         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
 493         outb(new, 0x4d0);
 494         outb(new >> 8, 0x4d1);
 495 }
 496
 497 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 498 {
 499         *irq = gsi;
 500         return 0;
 501 }
 502
 503 /*
 504  * success: return IRQ number (>=0)
 505  * failure: return < 0
 506  */
 507 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 508 {
 509         unsigned int irq;
 510         unsigned int plat_gsi = gsi;
 511
 512 #ifdef CONFIG_PCI
 513         /*
 514          * Make sure all (legacy) PCI IRQs are set as level-triggered.
 515          */
 516         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
 517                 extern void eisa_set_level_irq(unsigned int irq);
 518
 519                 if (triggering == ACPI_LEVEL_SENSITIVE)
 520                         eisa_set_level_irq(gsi);
 521         }
 522 #endif
 523
 524 #ifdef CONFIG_X86_IO_APIC
 525         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
 526                 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
 527         }
 528 #endif
 529         acpi_gsi_to_irq(plat_gsi, &irq);
 530         return irq;
 531 }
 532
 533 /*
 534  *  ACPI based hotplug support for CPU
 535  */
 536 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 537
 538 static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
 539 {
 540         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 541         union acpi_object *obj;
 542         struct acpi_madt_local_apic *lapic;
 543         cpumask_t tmp_map, new_map;
 544         u8 physid;
 545         int cpu;
 546
 547         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 548                 return -EINVAL;
 549
 550         if (!buffer.length || !buffer.pointer)
 551                 return -EINVAL;
 552
 553         obj = buffer.pointer;
 554         if (obj->type != ACPI_TYPE_BUFFER ||
 555             obj->buffer.length < sizeof(*lapic)) {
 556                 kfree(buffer.pointer);
 557                 return -EINVAL;
 558         }
 559
 560         lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
 561
 562         if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
 563             !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
 564                 kfree(buffer.pointer);
 565                 return -EINVAL;
 566         }
 567
 568         physid = lapic->id;
 569
 570         kfree(buffer.pointer);
 571         buffer.length = ACPI_ALLOCATE_BUFFER;
 572         buffer.pointer = NULL;
 573
 574         tmp_map = cpu_present_map;
 575         acpi_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
 576
 577         /*
 578          * If mp_register_lapic successfully generates a new logical cpu
 579          * number, then the following will get us exactly what was mapped
 580          */
 581         cpus_andnot(new_map, cpu_present_map, tmp_map);
 582         if (cpus_empty(new_map)) {
 583                 printk ("Unable to map lapic to logical cpu number\n");
 584                 return -EINVAL;
 585         }
 586
 587         cpu = first_cpu(new_map);
 588
 589         *pcpu = cpu;
 590         return 0;
 591 }
 592
 593 /* wrapper to silence section mismatch warning */
 594 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
 595 {
 596         return _acpi_map_lsapic(handle, pcpu);
 597 }
 598 EXPORT_SYMBOL(acpi_map_lsapic);
 599
 600 int acpi_unmap_lsapic(int cpu)
 601 {
 602         per_cpu(x86_cpu_to_apicid, cpu) = -1;
 603         cpu_clear(cpu, cpu_present_map);
 604         num_processors--;
 605
 606         return (0);
 607 }
 608
 609 EXPORT_SYMBOL(acpi_unmap_lsapic);
 610 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 611
 612 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 613 {
 614         /* TBD */
 615         return -EINVAL;
 616 }
 617
 618 EXPORT_SYMBOL(acpi_register_ioapic);
 619
 620 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 621 {
 622         /* TBD */
 623         return -EINVAL;
 624 }
 625
 626 EXPORT_SYMBOL(acpi_unregister_ioapic);
 627
 628 static int __init acpi_parse_sbf(struct acpi_table_header *table)
 629 {
 630         struct acpi_table_boot *sb;
 631
 632         sb = (struct acpi_table_boot *)table;
 633         if (!sb) {
 634                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
 635                 return -ENODEV;
 636         }
 637
 638         sbf_port = sb->cmos_index;      /* Save CMOS port */
 639
 640         return 0;
 641 }
 642
 643 #ifdef CONFIG_HPET_TIMER
 644 #include <asm/hpet.h>
 645
 646 static struct __initdata resource *hpet_res;
 647
 648 static int __init acpi_parse_hpet(struct acpi_table_header *table)
 649 {
 650         struct acpi_table_hpet *hpet_tbl;
 651
 652         hpet_tbl = (struct acpi_table_hpet *)table;
 653         if (!hpet_tbl) {
 654                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
 655                 return -ENODEV;
 656         }
 657
 658         if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
 659                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 660                        "memory.\n");
 661                 return -1;
 662         }
 663
 664         hpet_address = hpet_tbl->address.address;
 665
 666         /*
 667          * Some broken BIOSes advertise HPET at 0x0. We really do not
 668          * want to allocate a resource there.
 669          */
 670         if (!hpet_address) {
 671                 printk(KERN_WARNING PREFIX
 672                        "HPET id: %#x base: %#lx is invalid\n",
 673                        hpet_tbl->id, hpet_address);
 674                 return 0;
 675         }
 676 #ifdef CONFIG_X86_64
 677         /*
 678          * Some even more broken BIOSes advertise HPET at
 679          * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
 680          * some noise:
 681          */
 682         if (hpet_address == 0xfed0000000000000UL) {
 683                 if (!hpet_force_user) {
 684                         printk(KERN_WARNING PREFIX "HPET id: %#x "
 685                                "base: 0xfed0000000000000 is bogus\n "
 686                                "try hpet=force on the kernel command line to "
 687                                "fix it up to 0xfed00000.\n", hpet_tbl->id);
 688                         hpet_address = 0;
 689                         return 0;
 690                 }
 691                 printk(KERN_WARNING PREFIX
 692                        "HPET id: %#x base: 0xfed0000000000000 fixed up "
 693                        "to 0xfed00000.\n", hpet_tbl->id);
 694                 hpet_address >>= 32;
 695         }
 696 #endif
 697         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 698                hpet_tbl->id, hpet_address);
 699
 700         /*
 701          * Allocate and initialize the HPET firmware resource for adding into
 702          * the resource tree during the lateinit timeframe.
 703          */
 704 #define HPET_RESOURCE_NAME_SIZE 9
 705         hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
 706
 707         hpet_res->name = (void *)&hpet_res[1];
 708         hpet_res->flags = IORESOURCE_MEM;
 709         snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
 710                  hpet_tbl->sequence);
 711
 712         hpet_res->start = hpet_address;
 713         hpet_res->end = hpet_address + (1 * 1024) - 1;
 714
 715         return 0;
 716 }
 717
 718 /*
 719  * hpet_insert_resource inserts the HPET resources used into the resource
 720  * tree.
 721  */
 722 static __init int hpet_insert_resource(void)
 723 {
 724         if (!hpet_res)
 725                 return 1;
 726
 727         return insert_resource(&iomem_resource, hpet_res);
 728 }
 729
 730 late_initcall(hpet_insert_resource);
 731
 732 #else
 733 #define acpi_parse_hpet NULL
 734 #endif
 735
 736 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 737 {
 738
 739 #ifdef CONFIG_X86_PM_TIMER
 740         /* detect the location of the ACPI PM Timer */
 741         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
 742                 /* FADT rev. 2 */
 743                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
 744                     ACPI_ADR_SPACE_SYSTEM_IO)
 745                         return 0;
 746
 747                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
 748                 /*
 749                  * "X" fields are optional extensions to the original V1.0
 750                  * fields, so we must selectively expand V1.0 fields if the
 751                  * corresponding X field is zero.
 752                  */
 753                 if (!pmtmr_ioport)
 754                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 755         } else {
 756                 /* FADT rev. 1 */
 757                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 758         }
 759         if (pmtmr_ioport)
 760                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 761                        pmtmr_ioport);
 762 #endif
 763         return 0;
 764 }
 765
 766 #ifdef  CONFIG_X86_LOCAL_APIC
 767 /*
 768  * Parse LAPIC entries in MADT
 769  * returns 0 on success, < 0 on error
 770  */
 771
 772 static void __init acpi_register_lapic_address(unsigned long address)
 773 {
 774         mp_lapic_addr = address;
 775
 776         set_fixmap_nocache(FIX_APIC_BASE, address);
 777         if (boot_cpu_physical_apicid == -1U) {
 778                 boot_cpu_physical_apicid  = GET_APIC_ID(read_apic_id());
 779 #ifdef CONFIG_X86_32
 780                 apic_version[boot_cpu_physical_apicid] =
 781                          GET_APIC_VERSION(apic_read(APIC_LVR));
 782 #endif
 783         }
 784 }
 785
 786 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
 787 {
 788         int count;
 789
 790         if (!cpu_has_apic)
 791                 return -ENODEV;
 792
 793         /*
 794          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 795          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 796          */
 797
 798         count =
 799             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
 800                                   acpi_parse_lapic_addr_ovr, 0);
 801         if (count < 0) {
 802                 printk(KERN_ERR PREFIX
 803                        "Error parsing LAPIC address override entry\n");
 804                 return count;
 805         }
 806
 807         acpi_register_lapic_address(acpi_lapic_addr);
 808
 809         return count;
 810 }
 811
 812 static int __init acpi_parse_madt_lapic_entries(void)
 813 {
 814         int count;
 815
 816         if (!cpu_has_apic)
 817                 return -ENODEV;
 818
 819         /*
 820          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 821          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 822          */
 823
 824         count =
 825             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
 826                                   acpi_parse_lapic_addr_ovr, 0);
 827         if (count < 0) {
 828                 printk(KERN_ERR PREFIX
 829                        "Error parsing LAPIC address override entry\n");
 830                 return count;
 831         }
 832
 833         acpi_register_lapic_address(acpi_lapic_addr);
 834
 835         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
 836                                       acpi_parse_sapic, MAX_APICS);
 837
 838         if (!count)
 839                 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
 840                                               acpi_parse_lapic, MAX_APICS);
 841         if (!count) {
 842                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 843                 /* TBD: Cleanup to allow fallback to MPS */
 844                 return -ENODEV;
 845         } else if (count < 0) {
 846                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 847                 /* TBD: Cleanup to allow fallback to MPS */
 848                 return count;
 849         }
 850
 851         count =
 852             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
 853         if (count < 0) {
 854                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 855                 /* TBD: Cleanup to allow fallback to MPS */
 856                 return count;
 857         }
 858         return 0;
 859 }
 860 #endif                          /* CONFIG_X86_LOCAL_APIC */
 861
 862 #ifdef  CONFIG_X86_IO_APIC
 863 /*
 864  * Parse IOAPIC related entries in MADT
 865  * returns 0 on success, < 0 on error
 866  */
 867 static int __init acpi_parse_madt_ioapic_entries(void)
 868 {
 869         int count;
 870
 871         /*
 872          * ACPI interpreter is required to complete interrupt setup,
 873          * so if it is off, don't enumerate the io-apics with ACPI.
 874          * If MPS is present, it will handle them,
 875          * otherwise the system will stay in PIC mode
 876          */
 877         if (acpi_disabled || acpi_noirq) {
 878                 return -ENODEV;
 879         }
 880
 881         if (!cpu_has_apic)
 882                 return -ENODEV;
 883
 884         /*
 885          * if "noapic" boot option, don't look for IO-APICs
 886          */
 887         if (skip_ioapic_setup) {
 888                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 889                        "due to 'noapic' option.\n");
 890                 return -ENODEV;
 891         }
 892
 893         count =
 894             acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
 895                                   MAX_IO_APICS);
 896         if (!count) {
 897                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 898                 return -ENODEV;
 899         } else if (count < 0) {
 900                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 901                 return count;
 902         }
 903
 904         count =
 905             acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
 906                                   NR_IRQ_VECTORS);
 907         if (count < 0) {
 908                 printk(KERN_ERR PREFIX
 909                        "Error parsing interrupt source overrides entry\n");
 910                 /* TBD: Cleanup to allow fallback to MPS */
 911                 return count;
 912         }
 913
 914         /*
 915          * If BIOS did not supply an INT_SRC_OVR for the SCI
 916          * pretend we got one so we can set the SCI flags.
 917          */
 918         if (!acpi_sci_override_gsi)
 919                 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
 920
 921         /* Fill in identity legacy mapings where no override */
 922         mp_config_acpi_legacy_irqs();
 923
 924         count =
 925             acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
 926                                   NR_IRQ_VECTORS);
 927         if (count < 0) {
 928                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 929                 /* TBD: Cleanup to allow fallback to MPS */
 930                 return count;
 931         }
 932
 933         return 0;
 934 }
 935 #else
 936 static inline int acpi_parse_madt_ioapic_entries(void)
 937 {
 938         return -1;
 939 }
 940 #endif  /* !CONFIG_X86_IO_APIC */
 941
 942 static void __init early_acpi_process_madt(void)
 943 {
 944 #ifdef CONFIG_X86_LOCAL_APIC
 945         int error;
 946
 947         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 948
 949                 /*
 950                  * Parse MADT LAPIC entries
 951                  */
 952                 error = early_acpi_parse_madt_lapic_addr_ovr();
 953                 if (!error) {
 954                         acpi_lapic = 1;
 955                         smp_found_config = 1;
 956                 }
 957                 if (error == -EINVAL) {
 958                         /*
 959                          * Dell Precision Workstation 410, 610 come here.
 960                          */
 961                         printk(KERN_ERR PREFIX
 962                                "Invalid BIOS MADT, disabling ACPI\n");
 963                         disable_acpi();
 964                 }
 965         }
 966 #endif
 967 }
 968
 969 static void __init acpi_process_madt(void)
 970 {
 971 #ifdef CONFIG_X86_LOCAL_APIC
 972         int error;
 973
 974         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 975
 976                 /*
 977                  * Parse MADT LAPIC entries
 978                  */
 979                 error = acpi_parse_madt_lapic_entries();
 980                 if (!error) {
 981                         acpi_lapic = 1;
 982
 983 #ifdef CONFIG_X86_GENERICARCH
 984                         generic_bigsmp_probe();
 985 #endif
 986                         /*
 987                          * Parse MADT IO-APIC entries
 988                          */
 989                         error = acpi_parse_madt_ioapic_entries();
 990                         if (!error) {
 991                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 992                                 acpi_irq_balance_set(NULL);
 993                                 acpi_ioapic = 1;
 994
 995                                 smp_found_config = 1;
 996                                 setup_apic_routing();
 997                         }
 998                 }
 999                 if (error == -EINVAL) {
1000                         /*
1001                          * Dell Precision Workstation 410, 610 come here.
1002                          */
1003                         printk(KERN_ERR PREFIX
1004                                "Invalid BIOS MADT, disabling ACPI\n");
1005                         disable_acpi();
1006                 }
1007         }
1008 #endif
1009         return;
1010 }
1011
1012 #ifdef __i386__
1013
1014 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1015 {
1016         if (!acpi_force) {
1017                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1018                        d->ident);
1019                 acpi_noirq_set();
1020         }
1021         return 0;
1022 }
1023
1024 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1025 {
1026         if (!acpi_force) {
1027                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1028                        d->ident);
1029                 acpi_disable_pci();
1030         }
1031         return 0;
1032 }
1033
1034 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1035 {
1036         if (!acpi_force) {
1037                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1038                 disable_acpi();
1039         } else {
1040                 printk(KERN_NOTICE
1041                        "Warning: DMI blacklist says broken, but acpi forced\n");
1042         }
1043         return 0;
1044 }
1045
1046 /*
1047  * Limit ACPI to CPU enumeration for HT
1048  */
1049 static int __init force_acpi_ht(const struct dmi_system_id *d)
1050 {
1051         if (!acpi_force) {
1052                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
1053                        d->ident);
1054                 disable_acpi();
1055                 acpi_ht = 1;
1056         } else {
1057                 printk(KERN_NOTICE
1058                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
1059         }
1060         return 0;
1061 }
1062
1063 /*
1064  * If your system is blacklisted here, but you find that acpi=force
1065  * works for you, please contact acpi-devel@sourceforge.net
1066  */
1067 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1068         /*
1069          * Boxes that need ACPI disabled
1070          */
1071         {
1072          .callback = dmi_disable_acpi,
1073          .ident = "IBM Thinkpad",
1074          .matches = {
1075                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1076                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1077                      },
1078          },
1079
1080         /*
1081          * Boxes that need acpi=ht
1082          */
1083         {
1084          .callback = force_acpi_ht,
1085          .ident = "FSC Primergy T850",
1086          .matches = {
1087                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1088                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
1089                      },
1090          },
1091         {
1092          .callback = force_acpi_ht,
1093          .ident = "HP VISUALIZE NT Workstation",
1094          .matches = {
1095                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1096                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1097                      },
1098          },
1099         {
1100          .callback = force_acpi_ht,
1101          .ident = "Compaq Workstation W8000",
1102          .matches = {
1103                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1104                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1105                      },
1106          },
1107         {
1108          .callback = force_acpi_ht,
1109          .ident = "ASUS P4B266",
1110          .matches = {
1111                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1112                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1113                      },
1114          },
1115         {
1116          .callback = force_acpi_ht,
1117          .ident = "ASUS P2B-DS",
1118          .matches = {
1119                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1120                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1121                      },
1122          },
1123         {
1124          .callback = force_acpi_ht,
1125          .ident = "ASUS CUR-DLS",
1126          .matches = {
1127                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1128                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1129                      },
1130          },
1131         {
1132          .callback = force_acpi_ht,
1133          .ident = "ABIT i440BX-W83977",
1134          .matches = {
1135                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1136                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1137                      },
1138          },
1139         {
1140          .callback = force_acpi_ht,
1141          .ident = "IBM Bladecenter",
1142          .matches = {
1143                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1144                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1145                      },
1146          },
1147         {
1148          .callback = force_acpi_ht,
1149          .ident = "IBM eServer xSeries 360",
1150          .matches = {
1151                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1152                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1153                      },
1154          },
1155         {
1156          .callback = force_acpi_ht,
1157          .ident = "IBM eserver xSeries 330",
1158          .matches = {
1159                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1160                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1161                      },
1162          },
1163         {
1164          .callback = force_acpi_ht,
1165          .ident = "IBM eserver xSeries 440",
1166          .matches = {
1167                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1168                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1169                      },
1170          },
1171
1172         /*
1173          * Boxes that need ACPI PCI IRQ routing disabled
1174          */
1175         {
1176          .callback = disable_acpi_irq,
1177          .ident = "ASUS A7V",
1178          .matches = {
1179                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1180                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1181                      /* newer BIOS, Revision 1011, does work */
1182                      DMI_MATCH(DMI_BIOS_VERSION,
1183                                "ASUS A7V ACPI BIOS Revision 1007"),
1184                      },
1185          },
1186         {
1187                 /*
1188                  * Latest BIOS for IBM 600E (1.16) has bad pcinum
1189                  * for LPC bridge, which is needed for the PCI
1190                  * interrupt links to work. DSDT fix is in bug 5966.
1191                  * 2645, 2646 model numbers are shared with 600/600E/600X
1192                  */
1193          .callback = disable_acpi_irq,
1194          .ident = "IBM Thinkpad 600 Series 2645",
1195          .matches = {
1196                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1197                      DMI_MATCH(DMI_BOARD_NAME, "2645"),
1198                      },
1199          },
1200         {
1201          .callback = disable_acpi_irq,
1202          .ident = "IBM Thinkpad 600 Series 2646",
1203          .matches = {
1204                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1205                      DMI_MATCH(DMI_BOARD_NAME, "2646"),
1206                      },
1207          },
1208         /*
1209          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1210          */
1211         {                       /* _BBN 0 bug */
1212          .callback = disable_acpi_pci,
1213          .ident = "ASUS PR-DLS",
1214          .matches = {
1215                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1216                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1217                      DMI_MATCH(DMI_BIOS_VERSION,
1218                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1219                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1220                      },
1221          },
1222         {
1223          .callback = disable_acpi_pci,
1224          .ident = "Acer TravelMate 36x Laptop",
1225          .matches = {
1226                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1227                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1228                      },
1229          },
1230         {}
1231 };
1232
1233 #endif                          /* __i386__ */
1234
1235 /*
1236  * acpi_boot_table_init() and acpi_boot_init()
1237  *  called from setup_arch(), always.
1238  *      1. checksums all tables
1239  *      2. enumerates lapics
1240  *      3. enumerates io-apics
1241  *
1242  * acpi_table_init() is separate to allow reading SRAT without
1243  * other side effects.
1244  *
1245  * side effects of acpi_boot_init:
1246  *      acpi_lapic = 1 if LAPIC found
1247  *      acpi_ioapic = 1 if IOAPIC found
1248  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1249  *      if acpi_blacklisted() acpi_disabled = 1;
1250  *      acpi_irq_model=...
1251  *      ...
1252  *
1253  * return value: (currently ignored)
1254  *      0: success
1255  *      !0: failure
1256  */
1257
1258 int __init acpi_boot_table_init(void)
1259 {
1260         int error;
1261
1262 #ifdef __i386__
1263         dmi_check_system(acpi_dmi_table);
1264 #endif
1265
1266         /*
1267          * If acpi_disabled, bail out
1268          * One exception: acpi=ht continues far enough to enumerate LAPICs
1269          */
1270         if (acpi_disabled && !acpi_ht)
1271                 return 1;
1272
1273         /*
1274          * Initialize the ACPI boot-time table parser.
1275          */
1276         error = acpi_table_init();
1277         if (error) {
1278                 disable_acpi();
1279                 return error;
1280         }
1281
1282         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1283
1284         /*
1285          * blacklist may disable ACPI entirely
1286          */
1287         error = acpi_blacklisted();
1288         if (error) {
1289                 if (acpi_force) {
1290                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1291                 } else {
1292                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1293                         disable_acpi();
1294                         return error;
1295                 }
1296         }
1297
1298         return 0;
1299 }
1300
1301 int __init early_acpi_boot_init(void)
1302 {
1303         /*
1304          * If acpi_disabled, bail out
1305          * One exception: acpi=ht continues far enough to enumerate LAPICs
1306          */
1307         if (acpi_disabled && !acpi_ht)
1308                 return 1;
1309
1310         /*
1311          * Process the Multiple APIC Description Table (MADT), if present
1312          */
1313         early_acpi_process_madt();
1314
1315         return 0;
1316 }
1317
1318 int __init acpi_boot_init(void)
1319 {
1320         /*
1321          * If acpi_disabled, bail out
1322          * One exception: acpi=ht continues far enough to enumerate LAPICs
1323          */
1324         if (acpi_disabled && !acpi_ht)
1325                 return 1;
1326
1327         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1328
1329         /*
1330          * set sci_int and PM timer address
1331          */
1332         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1333
1334         /*
1335          * Process the Multiple APIC Description Table (MADT), if present
1336          */
1337         acpi_process_madt();
1338
1339         acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1340
1341         return 0;
1342 }
1343
1344 static int __init parse_acpi(char *arg)
1345 {
1346         if (!arg)
1347                 return -EINVAL;
1348
1349         /* "acpi=off" disables both ACPI table parsing and interpreter */
1350         if (strcmp(arg, "off") == 0) {
1351                 disable_acpi();
1352         }
1353         /* acpi=force to over-ride black-list */
1354         else if (strcmp(arg, "force") == 0) {
1355                 acpi_force = 1;
1356                 acpi_ht = 1;
1357                 acpi_disabled = 0;
1358         }
1359         /* acpi=strict disables out-of-spec workarounds */
1360         else if (strcmp(arg, "strict") == 0) {
1361                 acpi_strict = 1;
1362         }
1363         /* Limit ACPI just to boot-time to enable HT */
1364         else if (strcmp(arg, "ht") == 0) {
1365                 if (!acpi_force)
1366                         disable_acpi();
1367                 acpi_ht = 1;
1368         }
1369         /* "acpi=noirq" disables ACPI interrupt routing */
1370         else if (strcmp(arg, "noirq") == 0) {
1371                 acpi_noirq_set();
1372         } else {
1373                 /* Core will printk when we return error. */
1374                 return -EINVAL;
1375         }
1376         return 0;
1377 }
1378 early_param("acpi", parse_acpi);
1379
1380 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1381 static int __init parse_pci(char *arg)
1382 {
1383         if (arg && strcmp(arg, "noacpi") == 0)
1384                 acpi_disable_pci();
1385         return 0;
1386 }
1387 early_param("pci", parse_pci);
1388
1389 #ifdef CONFIG_X86_IO_APIC
1390 static int __init parse_acpi_skip_timer_override(char *arg)
1391 {
1392         acpi_skip_timer_override = 1;
1393         return 0;
1394 }
1395 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1396
1397 static int __init parse_acpi_use_timer_override(char *arg)
1398 {
1399         acpi_use_timer_override = 1;
1400         return 0;
1401 }
1402 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1403 #endif /* CONFIG_X86_IO_APIC */
1404
1405 static int __init setup_acpi_sci(char *s)
1406 {
1407         if (!s)
1408                 return -EINVAL;
1409         if (!strcmp(s, "edge"))
1410                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1411                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1412         else if (!strcmp(s, "level"))
1413                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1414                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1415         else if (!strcmp(s, "high"))
1416                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1417                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1418         else if (!strcmp(s, "low"))
1419                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1420                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1421         else
1422                 return -EINVAL;
1423         return 0;
1424 }
1425 early_param("acpi_sci", setup_acpi_sci);
1426
1427 int __acpi_acquire_global_lock(unsigned int *lock)
1428 {
1429         unsigned int old, new, val;
1430         do {
1431                 old = *lock;
1432                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1433                 val = cmpxchg(lock, old, new);
1434         } while (unlikely (val != old));
1435         return (new < 3) ? -1 : 0;
1436 }
1437
1438 int __acpi_release_global_lock(unsigned int *lock)
1439 {
1440         unsigned int old, new, val;
1441         do {
1442                 old = *lock;
1443                 new = old & ~0x3;
1444                 val = cmpxchg(lock, old, new);
1445         } while (unlikely (val != old));
1446         return old & 0x1;
1447 }