arch/i386/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 __initdata;       /* skip ACPI PCI scan and IRQ initialization */
  76 int acpi_ht __initdata = 1;     /* enable HT */
  77
  78 int acpi_lapic;
  79 int acpi_ioapic;
  80 int acpi_strict;
  81 EXPORT_SYMBOL(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  * overriden 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 *__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 *__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 IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
 418  * ECLR2 is IRQ's 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 irq's, 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 EXPORT_SYMBOL(acpi_register_gsi);
 494
 495 /*
 496  *  ACPI based hotplug support for CPU
 497  */
 498 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 499 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 500 {
 501         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 502         union acpi_object *obj;
 503         struct acpi_madt_local_apic *lapic;
 504         cpumask_t tmp_map, new_map;
 505         u8 physid;
 506         int cpu;
 507
 508         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 509                 return -EINVAL;
 510
 511         if (!buffer.length || !buffer.pointer)
 512                 return -EINVAL;
 513
 514         obj = buffer.pointer;
 515         if (obj->type != ACPI_TYPE_BUFFER ||
 516             obj->buffer.length < sizeof(*lapic)) {
 517                 kfree(buffer.pointer);
 518                 return -EINVAL;
 519         }
 520
 521         lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
 522
 523         if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
 524             !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
 525                 kfree(buffer.pointer);
 526                 return -EINVAL;
 527         }
 528
 529         physid = lapic->id;
 530
 531         kfree(buffer.pointer);
 532         buffer.length = ACPI_ALLOCATE_BUFFER;
 533         buffer.pointer = NULL;
 534
 535         tmp_map = cpu_present_map;
 536         mp_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
 537
 538         /*
 539          * If mp_register_lapic successfully generates a new logical cpu
 540          * number, then the following will get us exactly what was mapped
 541          */
 542         cpus_andnot(new_map, cpu_present_map, tmp_map);
 543         if (cpus_empty(new_map)) {
 544                 printk ("Unable to map lapic to logical cpu number\n");
 545                 return -EINVAL;
 546         }
 547
 548         cpu = first_cpu(new_map);
 549
 550         *pcpu = cpu;
 551         return 0;
 552 }
 553
 554 EXPORT_SYMBOL(acpi_map_lsapic);
 555
 556 int acpi_unmap_lsapic(int cpu)
 557 {
 558         x86_cpu_to_apicid[cpu] = -1;
 559         cpu_clear(cpu, cpu_present_map);
 560         num_processors--;
 561
 562         return (0);
 563 }
 564
 565 EXPORT_SYMBOL(acpi_unmap_lsapic);
 566 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 567
 568 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 569 {
 570         /* TBD */
 571         return -EINVAL;
 572 }
 573
 574 EXPORT_SYMBOL(acpi_register_ioapic);
 575
 576 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 577 {
 578         /* TBD */
 579         return -EINVAL;
 580 }
 581
 582 EXPORT_SYMBOL(acpi_unregister_ioapic);
 583
 584 static unsigned long __init
 585 acpi_scan_rsdp(unsigned long start, unsigned long length)
 586 {
 587         unsigned long offset = 0;
 588         unsigned long sig_len = sizeof("RSD PTR ") - 1;
 589
 590         /*
 591          * Scan all 16-byte boundaries of the physical memory region for the
 592          * RSDP signature.
 593          */
 594         for (offset = 0; offset < length; offset += 16) {
 595                 if (strncmp((char *)(phys_to_virt(start) + offset), "RSD PTR ", sig_len))
 596                         continue;
 597                 return (start + offset);
 598         }
 599
 600         return 0;
 601 }
 602
 603 static int __init acpi_parse_sbf(struct acpi_table_header *table)
 604 {
 605         struct acpi_table_boot *sb;
 606
 607         sb = (struct acpi_table_boot *)table;
 608         if (!sb) {
 609                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
 610                 return -ENODEV;
 611         }
 612
 613         sbf_port = sb->cmos_index;      /* Save CMOS port */
 614
 615         return 0;
 616 }
 617
 618 #ifdef CONFIG_HPET_TIMER
 619 #include <asm/hpet.h>
 620
 621 static int __init acpi_parse_hpet(struct acpi_table_header *table)
 622 {
 623         struct acpi_table_hpet *hpet_tbl;
 624         struct resource *hpet_res;
 625         resource_size_t res_start;
 626
 627         hpet_tbl = (struct acpi_table_hpet *)table;
 628         if (!hpet_tbl) {
 629                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
 630                 return -ENODEV;
 631         }
 632
 633         if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
 634                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 635                        "memory.\n");
 636                 return -1;
 637         }
 638
 639 #define HPET_RESOURCE_NAME_SIZE 9
 640         hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
 641         if (hpet_res) {
 642                 memset(hpet_res, 0, sizeof(*hpet_res));
 643                 hpet_res->name = (void *)&hpet_res[1];
 644                 hpet_res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 645                 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE,
 646                          "HPET %u", hpet_tbl->sequence);
 647                 hpet_res->end = (1 * 1024) - 1;
 648         }
 649
 650         hpet_address = hpet_tbl->address.address;
 651         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 652                hpet_tbl->id, hpet_address);
 653
 654         res_start = hpet_address;
 655
 656         if (hpet_res) {
 657                 hpet_res->start = res_start;
 658                 hpet_res->end += res_start;
 659                 insert_resource(&iomem_resource, hpet_res);
 660         }
 661
 662         return 0;
 663 }
 664 #else
 665 #define acpi_parse_hpet NULL
 666 #endif
 667
 668 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 669 {
 670
 671 #ifdef CONFIG_X86_PM_TIMER
 672         /* detect the location of the ACPI PM Timer */
 673         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
 674                 /* FADT rev. 2 */
 675                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
 676                     ACPI_ADR_SPACE_SYSTEM_IO)
 677                         return 0;
 678
 679                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
 680                 /*
 681                  * "X" fields are optional extensions to the original V1.0
 682                  * fields, so we must selectively expand V1.0 fields if the
 683                  * corresponding X field is zero.
 684                  */
 685                 if (!pmtmr_ioport)
 686                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 687         } else {
 688                 /* FADT rev. 1 */
 689                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 690         }
 691         if (pmtmr_ioport)
 692                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 693                        pmtmr_ioport);
 694 #endif
 695         return 0;
 696 }
 697
 698 unsigned long __init acpi_find_rsdp(void)
 699 {
 700         unsigned long rsdp_phys = 0;
 701
 702         if (efi_enabled) {
 703                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 704                         return efi.acpi20;
 705                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 706                         return efi.acpi;
 707         }
 708         /*
 709          * Scan memory looking for the RSDP signature. First search EBDA (low
 710          * memory) paragraphs and then search upper memory (E0000-FFFFF).
 711          */
 712         rsdp_phys = acpi_scan_rsdp(0, 0x400);
 713         if (!rsdp_phys)
 714                 rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);
 715
 716         return rsdp_phys;
 717 }
 718
 719 #ifdef  CONFIG_X86_LOCAL_APIC
 720 /*
 721  * Parse LAPIC entries in MADT
 722  * returns 0 on success, < 0 on error
 723  */
 724 static int __init acpi_parse_madt_lapic_entries(void)
 725 {
 726         int count;
 727
 728         if (!cpu_has_apic)
 729                 return -ENODEV;
 730
 731         /*
 732          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 733          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 734          */
 735
 736         count =
 737             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
 738                                   acpi_parse_lapic_addr_ovr, 0);
 739         if (count < 0) {
 740                 printk(KERN_ERR PREFIX
 741                        "Error parsing LAPIC address override entry\n");
 742                 return count;
 743         }
 744
 745         mp_register_lapic_address(acpi_lapic_addr);
 746
 747         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC, acpi_parse_lapic,
 748                                       MAX_APICS);
 749         if (!count) {
 750                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 751                 /* TBD: Cleanup to allow fallback to MPS */
 752                 return -ENODEV;
 753         } else if (count < 0) {
 754                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 755                 /* TBD: Cleanup to allow fallback to MPS */
 756                 return count;
 757         }
 758
 759         count =
 760             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
 761         if (count < 0) {
 762                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 763                 /* TBD: Cleanup to allow fallback to MPS */
 764                 return count;
 765         }
 766         return 0;
 767 }
 768 #endif                          /* CONFIG_X86_LOCAL_APIC */
 769
 770 #ifdef  CONFIG_X86_IO_APIC
 771 /*
 772  * Parse IOAPIC related entries in MADT
 773  * returns 0 on success, < 0 on error
 774  */
 775 static int __init acpi_parse_madt_ioapic_entries(void)
 776 {
 777         int count;
 778
 779         /*
 780          * ACPI interpreter is required to complete interrupt setup,
 781          * so if it is off, don't enumerate the io-apics with ACPI.
 782          * If MPS is present, it will handle them,
 783          * otherwise the system will stay in PIC mode
 784          */
 785         if (acpi_disabled || acpi_noirq) {
 786                 return -ENODEV;
 787         }
 788
 789         if (!cpu_has_apic)
 790                 return -ENODEV;
 791
 792         /*
 793          * if "noapic" boot option, don't look for IO-APICs
 794          */
 795         if (skip_ioapic_setup) {
 796                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 797                        "due to 'noapic' option.\n");
 798                 return -ENODEV;
 799         }
 800
 801         count =
 802             acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
 803                                   MAX_IO_APICS);
 804         if (!count) {
 805                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 806                 return -ENODEV;
 807         } else if (count < 0) {
 808                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 809                 return count;
 810         }
 811
 812         count =
 813             acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
 814                                   NR_IRQ_VECTORS);
 815         if (count < 0) {
 816                 printk(KERN_ERR PREFIX
 817                        "Error parsing interrupt source overrides entry\n");
 818                 /* TBD: Cleanup to allow fallback to MPS */
 819                 return count;
 820         }
 821
 822         /*
 823          * If BIOS did not supply an INT_SRC_OVR for the SCI
 824          * pretend we got one so we can set the SCI flags.
 825          */
 826         if (!acpi_sci_override_gsi)
 827                 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
 828
 829         /* Fill in identity legacy mapings where no override */
 830         mp_config_acpi_legacy_irqs();
 831
 832         count =
 833             acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
 834                                   NR_IRQ_VECTORS);
 835         if (count < 0) {
 836                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 837                 /* TBD: Cleanup to allow fallback to MPS */
 838                 return count;
 839         }
 840
 841         return 0;
 842 }
 843 #else
 844 static inline int acpi_parse_madt_ioapic_entries(void)
 845 {
 846         return -1;
 847 }
 848 #endif  /* !CONFIG_X86_IO_APIC */
 849
 850 static void __init acpi_process_madt(void)
 851 {
 852 #ifdef CONFIG_X86_LOCAL_APIC
 853         int error;
 854
 855         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 856
 857                 /*
 858                  * Parse MADT LAPIC entries
 859                  */
 860                 error = acpi_parse_madt_lapic_entries();
 861                 if (!error) {
 862                         acpi_lapic = 1;
 863
 864 #ifdef CONFIG_X86_GENERICARCH
 865                         generic_bigsmp_probe();
 866 #endif
 867                         /*
 868                          * Parse MADT IO-APIC entries
 869                          */
 870                         error = acpi_parse_madt_ioapic_entries();
 871                         if (!error) {
 872                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 873                                 acpi_irq_balance_set(NULL);
 874                                 acpi_ioapic = 1;
 875
 876                                 smp_found_config = 1;
 877                                 setup_apic_routing();
 878                         }
 879                 }
 880                 if (error == -EINVAL) {
 881                         /*
 882                          * Dell Precision Workstation 410, 610 come here.
 883                          */
 884                         printk(KERN_ERR PREFIX
 885                                "Invalid BIOS MADT, disabling ACPI\n");
 886                         disable_acpi();
 887                 }
 888         }
 889 #endif
 890         return;
 891 }
 892
 893 #ifdef __i386__
 894
 895 static int __init disable_acpi_irq(struct dmi_system_id *d)
 896 {
 897         if (!acpi_force) {
 898                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
 899                        d->ident);
 900                 acpi_noirq_set();
 901         }
 902         return 0;
 903 }
 904
 905 static int __init disable_acpi_pci(struct dmi_system_id *d)
 906 {
 907         if (!acpi_force) {
 908                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
 909                        d->ident);
 910                 acpi_disable_pci();
 911         }
 912         return 0;
 913 }
 914
 915 static int __init dmi_disable_acpi(struct dmi_system_id *d)
 916 {
 917         if (!acpi_force) {
 918                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
 919                 disable_acpi();
 920         } else {
 921                 printk(KERN_NOTICE
 922                        "Warning: DMI blacklist says broken, but acpi forced\n");
 923         }
 924         return 0;
 925 }
 926
 927 /*
 928  * Limit ACPI to CPU enumeration for HT
 929  */
 930 static int __init force_acpi_ht(struct dmi_system_id *d)
 931 {
 932         if (!acpi_force) {
 933                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
 934                        d->ident);
 935                 disable_acpi();
 936                 acpi_ht = 1;
 937         } else {
 938                 printk(KERN_NOTICE
 939                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
 940         }
 941         return 0;
 942 }
 943
 944 /*
 945  * If your system is blacklisted here, but you find that acpi=force
 946  * works for you, please contact acpi-devel@sourceforge.net
 947  */
 948 static struct dmi_system_id __initdata acpi_dmi_table[] = {
 949         /*
 950          * Boxes that need ACPI disabled
 951          */
 952         {
 953          .callback = dmi_disable_acpi,
 954          .ident = "IBM Thinkpad",
 955          .matches = {
 956                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
 957                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
 958                      },
 959          },
 960
 961         /*
 962          * Boxes that need acpi=ht
 963          */
 964         {
 965          .callback = force_acpi_ht,
 966          .ident = "FSC Primergy T850",
 967          .matches = {
 968                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 969                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
 970                      },
 971          },
 972         {
 973          .callback = force_acpi_ht,
 974          .ident = "DELL GX240",
 975          .matches = {
 976                      DMI_MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
 977                      DMI_MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
 978                      },
 979          },
 980         {
 981          .callback = force_acpi_ht,
 982          .ident = "HP VISUALIZE NT Workstation",
 983          .matches = {
 984                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 985                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
 986                      },
 987          },
 988         {
 989          .callback = force_acpi_ht,
 990          .ident = "Compaq Workstation W8000",
 991          .matches = {
 992                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
 993                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
 994                      },
 995          },
 996         {
 997          .callback = force_acpi_ht,
 998          .ident = "ASUS P4B266",
 999          .matches = {
1000                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1001                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1002                      },
1003          },
1004         {
1005          .callback = force_acpi_ht,
1006          .ident = "ASUS P2B-DS",
1007          .matches = {
1008                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1009                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1010                      },
1011          },
1012         {
1013          .callback = force_acpi_ht,
1014          .ident = "ASUS CUR-DLS",
1015          .matches = {
1016                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1017                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1018                      },
1019          },
1020         {
1021          .callback = force_acpi_ht,
1022          .ident = "ABIT i440BX-W83977",
1023          .matches = {
1024                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1025                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1026                      },
1027          },
1028         {
1029          .callback = force_acpi_ht,
1030          .ident = "IBM Bladecenter",
1031          .matches = {
1032                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1033                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1034                      },
1035          },
1036         {
1037          .callback = force_acpi_ht,
1038          .ident = "IBM eServer xSeries 360",
1039          .matches = {
1040                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1041                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1042                      },
1043          },
1044         {
1045          .callback = force_acpi_ht,
1046          .ident = "IBM eserver xSeries 330",
1047          .matches = {
1048                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1049                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1050                      },
1051          },
1052         {
1053          .callback = force_acpi_ht,
1054          .ident = "IBM eserver xSeries 440",
1055          .matches = {
1056                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1057                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1058                      },
1059          },
1060
1061         /*
1062          * Boxes that need ACPI PCI IRQ routing disabled
1063          */
1064         {
1065          .callback = disable_acpi_irq,
1066          .ident = "ASUS A7V",
1067          .matches = {
1068                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1069                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1070                      /* newer BIOS, Revision 1011, does work */
1071                      DMI_MATCH(DMI_BIOS_VERSION,
1072                                "ASUS A7V ACPI BIOS Revision 1007"),
1073                      },
1074          },
1075         {
1076                 /*
1077                  * Latest BIOS for IBM 600E (1.16) has bad pcinum
1078                  * for LPC bridge, which is needed for the PCI
1079                  * interrupt links to work. DSDT fix is in bug 5966.
1080                  * 2645, 2646 model numbers are shared with 600/600E/600X
1081                  */
1082          .callback = disable_acpi_irq,
1083          .ident = "IBM Thinkpad 600 Series 2645",
1084          .matches = {
1085                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1086                      DMI_MATCH(DMI_BOARD_NAME, "2645"),
1087                      },
1088          },
1089         {
1090          .callback = disable_acpi_irq,
1091          .ident = "IBM Thinkpad 600 Series 2646",
1092          .matches = {
1093                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1094                      DMI_MATCH(DMI_BOARD_NAME, "2646"),
1095                      },
1096          },
1097         /*
1098          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1099          */
1100         {                       /* _BBN 0 bug */
1101          .callback = disable_acpi_pci,
1102          .ident = "ASUS PR-DLS",
1103          .matches = {
1104                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1105                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1106                      DMI_MATCH(DMI_BIOS_VERSION,
1107                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1108                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1109                      },
1110          },
1111         {
1112          .callback = disable_acpi_pci,
1113          .ident = "Acer TravelMate 36x Laptop",
1114          .matches = {
1115                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1116                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1117                      },
1118          },
1119         {}
1120 };
1121
1122 #endif                          /* __i386__ */
1123
1124 /*
1125  * acpi_boot_table_init() and acpi_boot_init()
1126  *  called from setup_arch(), always.
1127  *      1. checksums all tables
1128  *      2. enumerates lapics
1129  *      3. enumerates io-apics
1130  *
1131  * acpi_table_init() is separate to allow reading SRAT without
1132  * other side effects.
1133  *
1134  * side effects of acpi_boot_init:
1135  *      acpi_lapic = 1 if LAPIC found
1136  *      acpi_ioapic = 1 if IOAPIC found
1137  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1138  *      if acpi_blacklisted() acpi_disabled = 1;
1139  *      acpi_irq_model=...
1140  *      ...
1141  *
1142  * return value: (currently ignored)
1143  *      0: success
1144  *      !0: failure
1145  */
1146
1147 int __init acpi_boot_table_init(void)
1148 {
1149         int error;
1150
1151 #ifdef __i386__
1152         dmi_check_system(acpi_dmi_table);
1153 #endif
1154
1155         /*
1156          * If acpi_disabled, bail out
1157          * One exception: acpi=ht continues far enough to enumerate LAPICs
1158          */
1159         if (acpi_disabled && !acpi_ht)
1160                 return 1;
1161
1162         /*
1163          * Initialize the ACPI boot-time table parser.
1164          */
1165         error = acpi_table_init();
1166         if (error) {
1167                 disable_acpi();
1168                 return error;
1169         }
1170
1171         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1172
1173         /*
1174          * blacklist may disable ACPI entirely
1175          */
1176         error = acpi_blacklisted();
1177         if (error) {
1178                 if (acpi_force) {
1179                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1180                 } else {
1181                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1182                         disable_acpi();
1183                         return error;
1184                 }
1185         }
1186
1187         return 0;
1188 }
1189
1190 int __init acpi_boot_init(void)
1191 {
1192         /*
1193          * If acpi_disabled, bail out
1194          * One exception: acpi=ht continues far enough to enumerate LAPICs
1195          */
1196         if (acpi_disabled && !acpi_ht)
1197                 return 1;
1198
1199         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1200
1201         /*
1202          * set sci_int and PM timer address
1203          */
1204         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1205
1206         /*
1207          * Process the Multiple APIC Description Table (MADT), if present
1208          */
1209         acpi_process_madt();
1210
1211         acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1212
1213         return 0;
1214 }
1215
1216 static int __init parse_acpi(char *arg)
1217 {
1218         if (!arg)
1219                 return -EINVAL;
1220
1221         /* "acpi=off" disables both ACPI table parsing and interpreter */
1222         if (strcmp(arg, "off") == 0) {
1223                 disable_acpi();
1224         }
1225         /* acpi=force to over-ride black-list */
1226         else if (strcmp(arg, "force") == 0) {
1227                 acpi_force = 1;
1228                 acpi_ht = 1;
1229                 acpi_disabled = 0;
1230         }
1231         /* acpi=strict disables out-of-spec workarounds */
1232         else if (strcmp(arg, "strict") == 0) {
1233                 acpi_strict = 1;
1234         }
1235         /* Limit ACPI just to boot-time to enable HT */
1236         else if (strcmp(arg, "ht") == 0) {
1237                 if (!acpi_force)
1238                         disable_acpi();
1239                 acpi_ht = 1;
1240         }
1241         /* "acpi=noirq" disables ACPI interrupt routing */
1242         else if (strcmp(arg, "noirq") == 0) {
1243                 acpi_noirq_set();
1244         } else {
1245                 /* Core will printk when we return error. */
1246                 return -EINVAL;
1247         }
1248         return 0;
1249 }
1250 early_param("acpi", parse_acpi);
1251
1252 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1253 static int __init parse_pci(char *arg)
1254 {
1255         if (arg && strcmp(arg, "noacpi") == 0)
1256                 acpi_disable_pci();
1257         return 0;
1258 }
1259 early_param("pci", parse_pci);
1260
1261 #ifdef CONFIG_X86_IO_APIC
1262 static int __init parse_acpi_skip_timer_override(char *arg)
1263 {
1264         acpi_skip_timer_override = 1;
1265         return 0;
1266 }
1267 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1268
1269 static int __init parse_acpi_use_timer_override(char *arg)
1270 {
1271         acpi_use_timer_override = 1;
1272         return 0;
1273 }
1274 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1275 #endif /* CONFIG_X86_IO_APIC */
1276
1277 static int __init setup_acpi_sci(char *s)
1278 {
1279         if (!s)
1280                 return -EINVAL;
1281         if (!strcmp(s, "edge"))
1282                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1283                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1284         else if (!strcmp(s, "level"))
1285                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1286                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1287         else if (!strcmp(s, "high"))
1288                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1289                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1290         else if (!strcmp(s, "low"))
1291                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1292                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1293         else
1294                 return -EINVAL;
1295         return 0;
1296 }
1297 early_param("acpi_sci", setup_acpi_sci);
1298
1299 int __acpi_acquire_global_lock(unsigned int *lock)
1300 {
1301         unsigned int old, new, val;
1302         do {
1303                 old = *lock;
1304                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1305                 val = cmpxchg(lock, old, new);
1306         } while (unlikely (val != old));
1307         return (new < 3) ? -1 : 0;
1308 }
1309
1310 int __acpi_release_global_lock(unsigned int *lock)
1311 {
1312         unsigned int old, new, val;
1313         do {
1314                 old = *lock;
1315                 new = old & ~0x3;
1316                 val = cmpxchg(lock, old, new);
1317         } while (unlikely (val != old));
1318         return old & 0x1;
1319 }