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