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