arch/x86/kernel/acpi/boot.c

   1 /*
   2  *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/init.h>
  27 #include <linux/acpi.h>
  28 #include <linux/acpi_pmtmr.h>
  29 #include <linux/efi.h>
  30 #include <linux/cpumask.h>
  31 #include <linux/module.h>
  32 #include <linux/dmi.h>
  33 #include <linux/irq.h>
  34 #include <linux/bootmem.h>
  35 #include <linux/ioport.h>
  36
  37 #include <asm/pgtable.h>
  38 #include <asm/io_apic.h>
  39 #include <asm/apic.h>
  40 #include <asm/io.h>
  41 #include <asm/mpspec.h>
  42
  43 static int __initdata acpi_force = 0;
  44
  45 #ifdef  CONFIG_ACPI
  46 int acpi_disabled = 0;
  47 #else
  48 int acpi_disabled = 1;
  49 #endif
  50 EXPORT_SYMBOL(acpi_disabled);
  51
  52 #ifdef  CONFIG_X86_64
  53
  54 #include <asm/proto.h>
  55
  56 static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return 0; }
  57
  58
  59 #else                           /* X86 */
  60
  61 #ifdef  CONFIG_X86_LOCAL_APIC
  62 #include <mach_apic.h>
  63 #include <mach_mpparse.h>
  64 #endif                          /* CONFIG_X86_LOCAL_APIC */
  65
  66 #endif                          /* X86 */
  67
  68 #define BAD_MADT_ENTRY(entry, end) (                                        \
  69                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  70                 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
  71
  72 #define PREFIX                  "ACPI: "
  73
  74 int acpi_noirq;                         /* skip ACPI IRQ initialization */
  75 <<<<<<< HEAD:arch/x86/kernel/acpi/boot.c
  76 int acpi_pci_disabled __initdata;       /* skip ACPI PCI scan and IRQ initialization */
  77 =======
  78 int acpi_pci_disabled;          /* skip ACPI PCI scan and IRQ initialization */
  79 EXPORT_SYMBOL(acpi_pci_disabled);
  80 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/acpi/boot.c
  81 int acpi_ht __initdata = 1;     /* enable HT */
  82
  83 int acpi_lapic;
  84 int acpi_ioapic;
  85 int acpi_strict;
  86
  87 u8 acpi_sci_flags __initdata;
  88 int acpi_sci_override_gsi __initdata;
  89 int acpi_skip_timer_override __initdata;
  90 int acpi_use_timer_override __initdata;
  91
  92 #ifdef CONFIG_X86_LOCAL_APIC
  93 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  94 #endif
  95
  96 #ifndef __HAVE_ARCH_CMPXCHG
  97 #warning ACPI uses CMPXCHG, i486 and later hardware
  98 #endif
  99
 100 /* --------------------------------------------------------------------------
 101                               Boot-time Configuration
 102    -------------------------------------------------------------------------- */
 103
 104 /*
 105  * The default interrupt routing model is PIC (8259).  This gets
 106  * overridden if IOAPICs are enumerated (below).
 107  */
 108 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
 109
 110 #ifdef  CONFIG_X86_64
 111
 112 /* rely on all ACPI tables being in the direct mapping */
 113 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
 114 {
 115         if (!phys_addr || !size)
 116                 return NULL;
 117
 118         if (phys_addr+size <= (end_pfn_map << PAGE_SHIFT) + PAGE_SIZE)
 119                 return __va(phys_addr);
 120
 121         return NULL;
 122 }
 123
 124 #else
 125
 126 /*
 127  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
 128  * to map the target physical address. The problem is that set_fixmap()
 129  * provides a single page, and it is possible that the page is not
 130  * sufficient.
 131  * By using this area, we can map up to MAX_IO_APICS pages temporarily,
 132  * i.e. until the next __va_range() call.
 133  *
 134  * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
 135  * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
 136  * count idx down while incrementing the phys address.
 137  */
 138 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
 139 {
 140         unsigned long base, offset, mapped_size;
 141         int idx;
 142
 143         if (phys + size < 8 * 1024 * 1024)
 144                 return __va(phys);
 145
 146         offset = phys & (PAGE_SIZE - 1);
 147         mapped_size = PAGE_SIZE - offset;
 148         set_fixmap(FIX_ACPI_END, phys);
 149         base = fix_to_virt(FIX_ACPI_END);
 150
 151         /*
 152          * Most cases can be covered by the below.
 153          */
 154         idx = FIX_ACPI_END;
 155         while (mapped_size < size) {
 156                 if (--idx < FIX_ACPI_BEGIN)
 157                         return NULL;    /* cannot handle this */
 158                 phys += PAGE_SIZE;
 159                 set_fixmap(idx, phys);
 160                 mapped_size += PAGE_SIZE;
 161         }
 162
 163         return ((unsigned char *)base + offset);
 164 }
 165 #endif
 166
 167 #ifdef CONFIG_PCI_MMCONFIG
 168 /* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
 169 struct acpi_mcfg_allocation *pci_mmcfg_config;
 170 int pci_mmcfg_config_num;
 171
 172 int __init acpi_parse_mcfg(struct acpi_table_header *header)
 173 {
 174         struct acpi_table_mcfg *mcfg;
 175         unsigned long i;
 176         int config_size;
 177
 178         if (!header)
 179                 return -EINVAL;
 180
 181         mcfg = (struct acpi_table_mcfg *)header;
 182
 183         /* how many config structures do we have */
 184         pci_mmcfg_config_num = 0;
 185         i = header->length - sizeof(struct acpi_table_mcfg);
 186         while (i >= sizeof(struct acpi_mcfg_allocation)) {
 187                 ++pci_mmcfg_config_num;
 188                 i -= sizeof(struct acpi_mcfg_allocation);
 189         };
 190         if (pci_mmcfg_config_num == 0) {
 191                 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
 192                 return -ENODEV;
 193         }
 194
 195         config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
 196         pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
 197         if (!pci_mmcfg_config) {
 198                 printk(KERN_WARNING PREFIX
 199                        "No memory for MCFG config tables\n");
 200                 return -ENOMEM;
 201         }
 202
 203         memcpy(pci_mmcfg_config, &mcfg[1], config_size);
 204         for (i = 0; i < pci_mmcfg_config_num; ++i) {
 205                 if (pci_mmcfg_config[i].address > 0xFFFFFFFF) {
 206                         printk(KERN_ERR PREFIX
 207                                "MMCONFIG not in low 4GB of memory\n");
 208                         kfree(pci_mmcfg_config);
 209                         pci_mmcfg_config_num = 0;
 210                         return -ENODEV;
 211                 }
 212         }
 213
 214         return 0;
 215 }
 216 #endif                          /* CONFIG_PCI_MMCONFIG */
 217
 218 #ifdef CONFIG_X86_LOCAL_APIC
 219 static int __init acpi_parse_madt(struct acpi_table_header *table)
 220 {
 221         struct acpi_table_madt *madt = NULL;
 222
 223         if (!cpu_has_apic)
 224                 return -EINVAL;
 225
 226         madt = (struct acpi_table_madt *)table;
 227         if (!madt) {
 228                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
 229                 return -ENODEV;
 230         }
 231
 232         if (madt->address) {
 233                 acpi_lapic_addr = (u64) madt->address;
 234
 235                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
 236                        madt->address);
 237         }
 238
 239         acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
 240
 241         return 0;
 242 }
 243
 244 static int __init
 245 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
 246 {
 247         struct acpi_madt_local_apic *processor = NULL;
 248
 249         processor = (struct acpi_madt_local_apic *)header;
 250
 251         if (BAD_MADT_ENTRY(processor, end))
 252                 return -EINVAL;
 253
 254         acpi_table_print_madt_entry(header);
 255
 256         /*
 257          * We need to register disabled CPU as well to permit
 258          * counting disabled CPUs. This allows us to size
 259          * cpus_possible_map more accurately, to permit
 260          * to not preallocating memory for all NR_CPUS
 261          * when we use CPU hotplug.
 262          */
 263         mp_register_lapic(processor->id,        /* APIC ID */
 264                           processor->lapic_flags & ACPI_MADT_ENABLED);  /* Enabled? */
 265
 266         return 0;
 267 }
 268
 269 static int __init
 270 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 271                           const unsigned long end)
 272 {
 273         struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
 274
 275         lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
 276
 277         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
 278                 return -EINVAL;
 279
 280         acpi_lapic_addr = lapic_addr_ovr->address;
 281
 282         return 0;
 283 }
 284
 285 static int __init
 286 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 287 {
 288         struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
 289
 290         lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
 291
 292         if (BAD_MADT_ENTRY(lapic_nmi, end))
 293                 return -EINVAL;
 294
 295         acpi_table_print_madt_entry(header);
 296
 297         if (lapic_nmi->lint != 1)
 298                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
 299
 300         return 0;
 301 }
 302
 303 #endif                          /*CONFIG_X86_LOCAL_APIC */
 304
 305 #ifdef CONFIG_X86_IO_APIC
 306
 307 static int __init
 308 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
 309 {
 310         struct acpi_madt_io_apic *ioapic = NULL;
 311
 312         ioapic = (struct acpi_madt_io_apic *)header;
 313
 314         if (BAD_MADT_ENTRY(ioapic, end))
 315                 return -EINVAL;
 316
 317         acpi_table_print_madt_entry(header);
 318
 319         mp_register_ioapic(ioapic->id,
 320                            ioapic->address, ioapic->global_irq_base);
 321
 322         return 0;
 323 }
 324
 325 /*
 326  * Parse Interrupt Source Override for the ACPI SCI
 327  */
 328 static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
 329 {
 330         if (trigger == 0)       /* compatible SCI trigger is level */
 331                 trigger = 3;
 332
 333         if (polarity == 0)      /* compatible SCI polarity is low */
 334                 polarity = 3;
 335
 336         /* Command-line over-ride via acpi_sci= */
 337         if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
 338                 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
 339
 340         if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
 341                 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
 342
 343         /*
 344          * mp_config_acpi_legacy_irqs() already setup IRQs < 16
 345          * If GSI is < 16, this will update its flags,
 346          * else it will create a new mp_irqs[] entry.
 347          */
 348         mp_override_legacy_irq(gsi, polarity, trigger, gsi);
 349
 350         /*
 351          * stash over-ride to indicate we've been here
 352          * and for later update of acpi_gbl_FADT
 353          */
 354         acpi_sci_override_gsi = gsi;
 355         return;
 356 }
 357
 358 static int __init
 359 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 360                        const unsigned long end)
 361 {
 362         struct acpi_madt_interrupt_override *intsrc = NULL;
 363
 364         intsrc = (struct acpi_madt_interrupt_override *)header;
 365
 366         if (BAD_MADT_ENTRY(intsrc, end))
 367                 return -EINVAL;
 368
 369         acpi_table_print_madt_entry(header);
 370
 371         if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
 372                 acpi_sci_ioapic_setup(intsrc->global_irq,
 373                                       intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 374                                       (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 375                 return 0;
 376         }
 377
 378         if (acpi_skip_timer_override &&
 379             intsrc->source_irq == 0 && intsrc->global_irq == 2) {
 380                 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
 381                 return 0;
 382         }
 383
 384         mp_override_legacy_irq(intsrc->source_irq,
 385                                 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 386                                 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
 387                                 intsrc->global_irq);
 388
 389         return 0;
 390 }
 391
 392 static int __init
 393 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 394 {
 395         struct acpi_madt_nmi_source *nmi_src = NULL;
 396
 397         nmi_src = (struct acpi_madt_nmi_source *)header;
 398
 399         if (BAD_MADT_ENTRY(nmi_src, end))
 400                 return -EINVAL;
 401
 402         acpi_table_print_madt_entry(header);
 403
 404         /* TBD: Support nimsrc entries? */
 405
 406         return 0;
 407 }
 408
 409 #endif                          /* CONFIG_X86_IO_APIC */
 410
 411 /*
 412  * acpi_pic_sci_set_trigger()
 413  *
 414  * use ELCR to set PIC-mode trigger type for SCI
 415  *
 416  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 417  * it may require Edge Trigger -- use "acpi_sci=edge"
 418  *
 419  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 420  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 421  * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
 422  * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
 423  */
 424
 425 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
 426 {
 427         unsigned int mask = 1 << irq;
 428         unsigned int old, new;
 429
 430         /* Real old ELCR mask */
 431         old = inb(0x4d0) | (inb(0x4d1) << 8);
 432
 433         /*
 434          * If we use ACPI to set PCI IRQs, then we should clear ELCR
 435          * since we will set it correctly as we enable the PCI irq
 436          * routing.
 437          */
 438         new = acpi_noirq ? old : 0;
 439
 440         /*
 441          * Update SCI information in the ELCR, it isn't in the PCI
 442          * routing tables..
 443          */
 444         switch (trigger) {
 445         case 1:         /* Edge - clear */
 446                 new &= ~mask;
 447                 break;
 448         case 3:         /* Level - set */
 449                 new |= mask;
 450                 break;
 451         }
 452
 453         if (old == new)
 454                 return;
 455
 456         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
 457         outb(new, 0x4d0);
 458         outb(new >> 8, 0x4d1);
 459 }
 460
 461 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 462 {
 463         *irq = gsi;
 464         return 0;
 465 }
 466
 467 /*
 468  * success: return IRQ number (>=0)
 469  * failure: return < 0
 470  */
 471 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 472 {
 473         unsigned int irq;
 474         unsigned int plat_gsi = gsi;
 475
 476 #ifdef CONFIG_PCI
 477         /*
 478          * Make sure all (legacy) PCI IRQs are set as level-triggered.
 479          */
 480         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
 481                 extern void eisa_set_level_irq(unsigned int irq);
 482
 483                 if (triggering == ACPI_LEVEL_SENSITIVE)
 484                         eisa_set_level_irq(gsi);
 485         }
 486 #endif
 487
 488 #ifdef CONFIG_X86_IO_APIC
 489         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
 490                 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
 491         }
 492 #endif
 493         acpi_gsi_to_irq(plat_gsi, &irq);
 494         return irq;
 495 }
 496
 497 /*
 498  *  ACPI based hotplug support for CPU
 499  */
 500 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 501
 502 static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
 503 {
 504         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 505         union acpi_object *obj;
 506         struct acpi_madt_local_apic *lapic;
 507         cpumask_t tmp_map, new_map;
 508         u8 physid;
 509         int cpu;
 510
 511         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 512                 return -EINVAL;
 513
 514         if (!buffer.length || !buffer.pointer)
 515                 return -EINVAL;
 516
 517         obj = buffer.pointer;
 518         if (obj->type != ACPI_TYPE_BUFFER ||
 519             obj->buffer.length < sizeof(*lapic)) {
 520                 kfree(buffer.pointer);
 521                 return -EINVAL;
 522         }
 523
 524         lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
 525
 526         if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
 527             !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
 528                 kfree(buffer.pointer);
 529                 return -EINVAL;
 530         }
 531
 532         physid = lapic->id;
 533
 534         kfree(buffer.pointer);
 535         buffer.length = ACPI_ALLOCATE_BUFFER;
 536         buffer.pointer = NULL;
 537
 538         tmp_map = cpu_present_map;
 539         mp_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
 540
 541         /*
 542          * If mp_register_lapic successfully generates a new logical cpu
 543          * number, then the following will get us exactly what was mapped
 544          */
 545         cpus_andnot(new_map, cpu_present_map, tmp_map);
 546         if (cpus_empty(new_map)) {
 547                 printk ("Unable to map lapic to logical cpu number\n");
 548                 return -EINVAL;
 549         }
 550
 551         cpu = first_cpu(new_map);
 552
 553         *pcpu = cpu;
 554         return 0;
 555 }
 556
 557 /* wrapper to silence section mismatch warning */
 558 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
 559 {
 560         return _acpi_map_lsapic(handle, pcpu);
 561 }
 562 EXPORT_SYMBOL(acpi_map_lsapic);
 563
 564 int acpi_unmap_lsapic(int cpu)
 565 {
 566         per_cpu(x86_cpu_to_apicid, cpu) = -1;
 567         cpu_clear(cpu, cpu_present_map);
 568         num_processors--;
 569
 570         return (0);
 571 }
 572
 573 EXPORT_SYMBOL(acpi_unmap_lsapic);
 574 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 575
 576 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 577 {
 578         /* TBD */
 579         return -EINVAL;
 580 }
 581
 582 EXPORT_SYMBOL(acpi_register_ioapic);
 583
 584 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 585 {
 586         /* TBD */
 587         return -EINVAL;
 588 }
 589
 590 EXPORT_SYMBOL(acpi_unregister_ioapic);
 591
 592 static int __init acpi_parse_sbf(struct acpi_table_header *table)
 593 {
 594         struct acpi_table_boot *sb;
 595
 596         sb = (struct acpi_table_boot *)table;
 597         if (!sb) {
 598                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
 599                 return -ENODEV;
 600         }
 601
 602         sbf_port = sb->cmos_index;      /* Save CMOS port */
 603
 604         return 0;
 605 }
 606
 607 #ifdef CONFIG_HPET_TIMER
 608 #include <asm/hpet.h>
 609
 610 static struct __initdata resource *hpet_res;
 611
 612 static int __init acpi_parse_hpet(struct acpi_table_header *table)
 613 {
 614         struct acpi_table_hpet *hpet_tbl;
 615
 616         hpet_tbl = (struct acpi_table_hpet *)table;
 617         if (!hpet_tbl) {
 618                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
 619                 return -ENODEV;
 620         }
 621
 622         if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
 623                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 624                        "memory.\n");
 625                 return -1;
 626         }
 627
 628         hpet_address = hpet_tbl->address.address;
 629
 630         /*
 631          * Some broken BIOSes advertise HPET at 0x0. We really do not
 632          * want to allocate a resource there.
 633          */
 634         if (!hpet_address) {
 635                 printk(KERN_WARNING PREFIX
 636                        "HPET id: %#x base: %#lx is invalid\n",
 637                        hpet_tbl->id, hpet_address);
 638                 return 0;
 639         }
 640 #ifdef CONFIG_X86_64
 641         /*
 642          * Some even more broken BIOSes advertise HPET at
 643          * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
 644          * some noise:
 645          */
 646         if (hpet_address == 0xfed0000000000000UL) {
 647                 if (!hpet_force_user) {
 648                         printk(KERN_WARNING PREFIX "HPET id: %#x "
 649                                "base: 0xfed0000000000000 is bogus\n "
 650                                "try hpet=force on the kernel command line to "
 651                                "fix it up to 0xfed00000.\n", hpet_tbl->id);
 652                         hpet_address = 0;
 653                         return 0;
 654                 }
 655                 printk(KERN_WARNING PREFIX
 656                        "HPET id: %#x base: 0xfed0000000000000 fixed up "
 657                        "to 0xfed00000.\n", hpet_tbl->id);
 658                 hpet_address >>= 32;
 659         }
 660 #endif
 661         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 662                hpet_tbl->id, hpet_address);
 663
 664         /*
 665          * Allocate and initialize the HPET firmware resource for adding into
 666          * the resource tree during the lateinit timeframe.
 667          */
 668 #define HPET_RESOURCE_NAME_SIZE 9
 669         hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
 670
 671         if (!hpet_res)
 672                 return 0;
 673
 674         memset(hpet_res, 0, sizeof(*hpet_res));
 675         hpet_res->name = (void *)&hpet_res[1];
 676         hpet_res->flags = IORESOURCE_MEM;
 677         snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
 678                  hpet_tbl->sequence);
 679
 680         hpet_res->start = hpet_address;
 681         hpet_res->end = hpet_address + (1 * 1024) - 1;
 682
 683         return 0;
 684 }
 685
 686 /*
 687  * hpet_insert_resource inserts the HPET resources used into the resource
 688  * tree.
 689  */
 690 static __init int hpet_insert_resource(void)
 691 {
 692         if (!hpet_res)
 693                 return 1;
 694
 695         return insert_resource(&iomem_resource, hpet_res);
 696 }
 697
 698 late_initcall(hpet_insert_resource);
 699
 700 #else
 701 #define acpi_parse_hpet NULL
 702 #endif
 703
 704 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 705 {
 706
 707 #ifdef CONFIG_X86_PM_TIMER
 708         /* detect the location of the ACPI PM Timer */
 709         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
 710                 /* FADT rev. 2 */
 711                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
 712                     ACPI_ADR_SPACE_SYSTEM_IO)
 713                         return 0;
 714
 715                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
 716                 /*
 717                  * "X" fields are optional extensions to the original V1.0
 718                  * fields, so we must selectively expand V1.0 fields if the
 719                  * corresponding X field is zero.
 720                  */
 721                 if (!pmtmr_ioport)
 722                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 723         } else {
 724                 /* FADT rev. 1 */
 725                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 726         }
 727         if (pmtmr_ioport)
 728                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 729                        pmtmr_ioport);
 730 #endif
 731         return 0;
 732 }
 733
 734 #ifdef  CONFIG_X86_LOCAL_APIC
 735 /*
 736  * Parse LAPIC entries in MADT
 737  * returns 0 on success, < 0 on error
 738  */
 739 static int __init acpi_parse_madt_lapic_entries(void)
 740 {
 741         int count;
 742
 743         if (!cpu_has_apic)
 744                 return -ENODEV;
 745
 746         /*
 747          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 748          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 749          */
 750
 751         count =
 752             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
 753                                   acpi_parse_lapic_addr_ovr, 0);
 754         if (count < 0) {
 755                 printk(KERN_ERR PREFIX
 756                        "Error parsing LAPIC address override entry\n");
 757                 return count;
 758         }
 759
 760         mp_register_lapic_address(acpi_lapic_addr);
 761
 762         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC, acpi_parse_lapic,
 763                                       MAX_APICS);
 764         if (!count) {
 765                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 766                 /* TBD: Cleanup to allow fallback to MPS */
 767                 return -ENODEV;
 768         } else if (count < 0) {
 769                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 770                 /* TBD: Cleanup to allow fallback to MPS */
 771                 return count;
 772         }
 773
 774         count =
 775             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
 776         if (count < 0) {
 777                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 778                 /* TBD: Cleanup to allow fallback to MPS */
 779                 return count;
 780         }
 781         return 0;
 782 }
 783 #endif                          /* CONFIG_X86_LOCAL_APIC */
 784
 785 #ifdef  CONFIG_X86_IO_APIC
 786 /*
 787  * Parse IOAPIC related entries in MADT
 788  * returns 0 on success, < 0 on error
 789  */
 790 static int __init acpi_parse_madt_ioapic_entries(void)
 791 {
 792         int count;
 793
 794         /*
 795          * ACPI interpreter is required to complete interrupt setup,
 796          * so if it is off, don't enumerate the io-apics with ACPI.
 797          * If MPS is present, it will handle them,
 798          * otherwise the system will stay in PIC mode
 799          */
 800         if (acpi_disabled || acpi_noirq) {
 801                 return -ENODEV;
 802         }
 803
 804         if (!cpu_has_apic)
 805                 return -ENODEV;
 806
 807         /*
 808          * if "noapic" boot option, don't look for IO-APICs
 809          */
 810         if (skip_ioapic_setup) {
 811                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 812                        "due to 'noapic' option.\n");
 813                 return -ENODEV;
 814         }
 815
 816         count =
 817             acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
 818                                   MAX_IO_APICS);
 819         if (!count) {
 820                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 821                 return -ENODEV;
 822         } else if (count < 0) {
 823                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 824                 return count;
 825         }
 826
 827         count =
 828             acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
 829                                   NR_IRQ_VECTORS);
 830         if (count < 0) {
 831                 printk(KERN_ERR PREFIX
 832                        "Error parsing interrupt source overrides entry\n");
 833                 /* TBD: Cleanup to allow fallback to MPS */
 834                 return count;
 835         }
 836
 837         /*
 838          * If BIOS did not supply an INT_SRC_OVR for the SCI
 839          * pretend we got one so we can set the SCI flags.
 840          */
 841         if (!acpi_sci_override_gsi)
 842                 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
 843
 844         /* Fill in identity legacy mapings where no override */
 845         mp_config_acpi_legacy_irqs();
 846
 847         count =
 848             acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
 849                                   NR_IRQ_VECTORS);
 850         if (count < 0) {
 851                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 852                 /* TBD: Cleanup to allow fallback to MPS */
 853                 return count;
 854         }
 855
 856         return 0;
 857 }
 858 #else
 859 static inline int acpi_parse_madt_ioapic_entries(void)
 860 {
 861         return -1;
 862 }
 863 #endif  /* !CONFIG_X86_IO_APIC */
 864
 865 static void __init acpi_process_madt(void)
 866 {
 867 #ifdef CONFIG_X86_LOCAL_APIC
 868         int error;
 869
 870         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 871
 872                 /*
 873                  * Parse MADT LAPIC entries
 874                  */
 875                 error = acpi_parse_madt_lapic_entries();
 876                 if (!error) {
 877                         acpi_lapic = 1;
 878
 879 #ifdef CONFIG_X86_GENERICARCH
 880                         generic_bigsmp_probe();
 881 #endif
 882                         /*
 883                          * Parse MADT IO-APIC entries
 884                          */
 885                         error = acpi_parse_madt_ioapic_entries();
 886                         if (!error) {
 887                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 888                                 acpi_irq_balance_set(NULL);
 889                                 acpi_ioapic = 1;
 890
 891                                 smp_found_config = 1;
 892                                 setup_apic_routing();
 893                         }
 894                 }
 895                 if (error == -EINVAL) {
 896                         /*
 897                          * Dell Precision Workstation 410, 610 come here.
 898                          */
 899                         printk(KERN_ERR PREFIX
 900                                "Invalid BIOS MADT, disabling ACPI\n");
 901                         disable_acpi();
 902                 }
 903         }
 904 #endif
 905         return;
 906 }
 907
 908 #ifdef __i386__
 909
 910 static int __init disable_acpi_irq(const struct dmi_system_id *d)
 911 {
 912         if (!acpi_force) {
 913                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
 914                        d->ident);
 915                 acpi_noirq_set();
 916         }
 917         return 0;
 918 }
 919
 920 static int __init disable_acpi_pci(const struct dmi_system_id *d)
 921 {
 922         if (!acpi_force) {
 923                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
 924                        d->ident);
 925                 acpi_disable_pci();
 926         }
 927         return 0;
 928 }
 929
 930 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
 931 {
 932         if (!acpi_force) {
 933                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
 934                 disable_acpi();
 935         } else {
 936                 printk(KERN_NOTICE
 937                        "Warning: DMI blacklist says broken, but acpi forced\n");
 938         }
 939         return 0;
 940 }
 941
 942 /*
 943  * Limit ACPI to CPU enumeration for HT
 944  */
 945 static int __init force_acpi_ht(const struct dmi_system_id *d)
 946 {
 947         if (!acpi_force) {
 948                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
 949                        d->ident);
 950                 disable_acpi();
 951                 acpi_ht = 1;
 952         } else {
 953                 printk(KERN_NOTICE
 954                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
 955         }
 956         return 0;
 957 }
 958
 959 /*
 960  * If your system is blacklisted here, but you find that acpi=force
 961  * works for you, please contact acpi-devel@sourceforge.net
 962  */
 963 static struct dmi_system_id __initdata acpi_dmi_table[] = {
 964         /*
 965          * Boxes that need ACPI disabled
 966          */
 967         {
 968          .callback = dmi_disable_acpi,
 969          .ident = "IBM Thinkpad",
 970          .matches = {
 971                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
 972                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
 973                      },
 974          },
 975
 976         /*
 977          * Boxes that need acpi=ht
 978          */
 979         {
 980          .callback = force_acpi_ht,
 981          .ident = "FSC Primergy T850",
 982          .matches = {
 983                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 984                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
 985                      },
 986          },
 987         {
 988          .callback = force_acpi_ht,
 989          .ident = "HP VISUALIZE NT Workstation",
 990          .matches = {
 991                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 992                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
 993                      },
 994          },
 995         {
 996          .callback = force_acpi_ht,
 997          .ident = "Compaq Workstation W8000",
 998          .matches = {
 999                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1000                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1001                      },
1002          },
1003         {
1004          .callback = force_acpi_ht,
1005          .ident = "ASUS P4B266",
1006          .matches = {
1007                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1008                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1009                      },
1010          },
1011         {
1012          .callback = force_acpi_ht,
1013          .ident = "ASUS P2B-DS",
1014          .matches = {
1015                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1016                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1017                      },
1018          },
1019         {
1020          .callback = force_acpi_ht,
1021          .ident = "ASUS CUR-DLS",
1022          .matches = {
1023                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1024                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1025                      },
1026          },
1027         {
1028          .callback = force_acpi_ht,
1029          .ident = "ABIT i440BX-W83977",
1030          .matches = {
1031                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1032                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1033                      },
1034          },
1035         {
1036          .callback = force_acpi_ht,
1037          .ident = "IBM Bladecenter",
1038          .matches = {
1039                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1040                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1041                      },
1042          },
1043         {
1044          .callback = force_acpi_ht,
1045          .ident = "IBM eServer xSeries 360",
1046          .matches = {
1047                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1048                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1049                      },
1050          },
1051         {
1052          .callback = force_acpi_ht,
1053          .ident = "IBM eserver xSeries 330",
1054          .matches = {
1055                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1056                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1057                      },
1058          },
1059         {
1060          .callback = force_acpi_ht,
1061          .ident = "IBM eserver xSeries 440",
1062          .matches = {
1063                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1064                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1065                      },
1066          },
1067
1068         /*
1069          * Boxes that need ACPI PCI IRQ routing disabled
1070          */
1071         {
1072          .callback = disable_acpi_irq,
1073          .ident = "ASUS A7V",
1074          .matches = {
1075                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1076                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1077                      /* newer BIOS, Revision 1011, does work */
1078                      DMI_MATCH(DMI_BIOS_VERSION,
1079                                "ASUS A7V ACPI BIOS Revision 1007"),
1080                      },
1081          },
1082         {
1083                 /*
1084                  * Latest BIOS for IBM 600E (1.16) has bad pcinum
1085                  * for LPC bridge, which is needed for the PCI
1086                  * interrupt links to work. DSDT fix is in bug 5966.
1087                  * 2645, 2646 model numbers are shared with 600/600E/600X
1088                  */
1089          .callback = disable_acpi_irq,
1090          .ident = "IBM Thinkpad 600 Series 2645",
1091          .matches = {
1092                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1093                      DMI_MATCH(DMI_BOARD_NAME, "2645"),
1094                      },
1095          },
1096         {
1097          .callback = disable_acpi_irq,
1098          .ident = "IBM Thinkpad 600 Series 2646",
1099          .matches = {
1100                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1101                      DMI_MATCH(DMI_BOARD_NAME, "2646"),
1102                      },
1103          },
1104         /*
1105          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1106          */
1107         {                       /* _BBN 0 bug */
1108          .callback = disable_acpi_pci,
1109          .ident = "ASUS PR-DLS",
1110          .matches = {
1111                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1112                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1113                      DMI_MATCH(DMI_BIOS_VERSION,
1114                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1115                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1116                      },
1117          },
1118         {
1119          .callback = disable_acpi_pci,
1120          .ident = "Acer TravelMate 36x Laptop",
1121          .matches = {
1122                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1123                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1124                      },
1125          },
1126         {}
1127 };
1128
1129 #endif                          /* __i386__ */
1130
1131 /*
1132  * acpi_boot_table_init() and acpi_boot_init()
1133  *  called from setup_arch(), always.
1134  *      1. checksums all tables
1135  *      2. enumerates lapics
1136  *      3. enumerates io-apics
1137  *
1138  * acpi_table_init() is separate to allow reading SRAT without
1139  * other side effects.
1140  *
1141  * side effects of acpi_boot_init:
1142  *      acpi_lapic = 1 if LAPIC found
1143  *      acpi_ioapic = 1 if IOAPIC found
1144  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1145  *      if acpi_blacklisted() acpi_disabled = 1;
1146  *      acpi_irq_model=...
1147  *      ...
1148  *
1149  * return value: (currently ignored)
1150  *      0: success
1151  *      !0: failure
1152  */
1153
1154 int __init acpi_boot_table_init(void)
1155 {
1156         int error;
1157
1158 #ifdef __i386__
1159         dmi_check_system(acpi_dmi_table);
1160 #endif
1161
1162         /*
1163          * If acpi_disabled, bail out
1164          * One exception: acpi=ht continues far enough to enumerate LAPICs
1165          */
1166         if (acpi_disabled && !acpi_ht)
1167                 return 1;
1168
1169         /*
1170          * Initialize the ACPI boot-time table parser.
1171          */
1172         error = acpi_table_init();
1173         if (error) {
1174                 disable_acpi();
1175                 return error;
1176         }
1177
1178         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1179
1180         /*
1181          * blacklist may disable ACPI entirely
1182          */
1183         error = acpi_blacklisted();
1184         if (error) {
1185                 if (acpi_force) {
1186                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1187                 } else {
1188                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1189                         disable_acpi();
1190                         return error;
1191                 }
1192         }
1193
1194         return 0;
1195 }
1196
1197 int __init acpi_boot_init(void)
1198 {
1199         /*
1200          * If acpi_disabled, bail out
1201          * One exception: acpi=ht continues far enough to enumerate LAPICs
1202          */
1203         if (acpi_disabled && !acpi_ht)
1204                 return 1;
1205
1206         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1207
1208         /*
1209          * set sci_int and PM timer address
1210          */
1211         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1212
1213         /*
1214          * Process the Multiple APIC Description Table (MADT), if present
1215          */
1216         acpi_process_madt();
1217
1218         acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1219
1220         return 0;
1221 }
1222
1223 static int __init parse_acpi(char *arg)
1224 {
1225         if (!arg)
1226                 return -EINVAL;
1227
1228         /* "acpi=off" disables both ACPI table parsing and interpreter */
1229         if (strcmp(arg, "off") == 0) {
1230                 disable_acpi();
1231         }
1232         /* acpi=force to over-ride black-list */
1233         else if (strcmp(arg, "force") == 0) {
1234                 acpi_force = 1;
1235                 acpi_ht = 1;
1236                 acpi_disabled = 0;
1237         }
1238         /* acpi=strict disables out-of-spec workarounds */
1239         else if (strcmp(arg, "strict") == 0) {
1240                 acpi_strict = 1;
1241         }
1242         /* Limit ACPI just to boot-time to enable HT */
1243         else if (strcmp(arg, "ht") == 0) {
1244                 if (!acpi_force)
1245                         disable_acpi();
1246                 acpi_ht = 1;
1247         }
1248         /* "acpi=noirq" disables ACPI interrupt routing */
1249         else if (strcmp(arg, "noirq") == 0) {
1250                 acpi_noirq_set();
1251         } else {
1252                 /* Core will printk when we return error. */
1253                 return -EINVAL;
1254         }
1255         return 0;
1256 }
1257 early_param("acpi", parse_acpi);
1258
1259 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1260 static int __init parse_pci(char *arg)
1261 {
1262         if (arg && strcmp(arg, "noacpi") == 0)
1263                 acpi_disable_pci();
1264         return 0;
1265 }
1266 early_param("pci", parse_pci);
1267
1268 #ifdef CONFIG_X86_IO_APIC
1269 static int __init parse_acpi_skip_timer_override(char *arg)
1270 {
1271         acpi_skip_timer_override = 1;
1272         return 0;
1273 }
1274 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1275
1276 static int __init parse_acpi_use_timer_override(char *arg)
1277 {
1278         acpi_use_timer_override = 1;
1279         return 0;
1280 }
1281 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1282 #endif /* CONFIG_X86_IO_APIC */
1283
1284 static int __init setup_acpi_sci(char *s)
1285 {
1286         if (!s)
1287                 return -EINVAL;
1288         if (!strcmp(s, "edge"))
1289                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1290                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1291         else if (!strcmp(s, "level"))
1292                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1293                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1294         else if (!strcmp(s, "high"))
1295                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1296                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1297         else if (!strcmp(s, "low"))
1298                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1299                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1300         else
1301                 return -EINVAL;
1302         return 0;
1303 }
1304 early_param("acpi_sci", setup_acpi_sci);
1305
1306 int __acpi_acquire_global_lock(unsigned int *lock)
1307 {
1308         unsigned int old, new, val;
1309         do {
1310                 old = *lock;
1311                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1312                 val = cmpxchg(lock, old, new);
1313         } while (unlikely (val != old));
1314         return (new < 3) ? -1 : 0;
1315 }
1316
1317 int __acpi_release_global_lock(unsigned int *lock)
1318 {
1319         unsigned int old, new, val;
1320         do {
1321                 old = *lock;
1322                 new = old & ~0x3;
1323                 val = cmpxchg(lock, old, new);
1324         } while (unlikely (val != old));
1325         return old & 0x1;
1326 }