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/efi.h>
  29 #include <linux/cpumask.h>
  30 #include <linux/module.h>
  31 #include <linux/dmi.h>
  32 #include <linux/irq.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/ioport.h>
  35
  36 #include <asm/pgtable.h>
  37 #include <asm/io_apic.h>
  38 #include <asm/apic.h>
  39 #include <asm/io.h>
  40 #include <asm/mpspec.h>
  41
  42 static int __initdata acpi_force = 0;
  43
  44 #ifdef  CONFIG_ACPI
  45 int acpi_disabled = 0;
  46 #else
  47 int acpi_disabled = 1;
  48 #endif
  49 EXPORT_SYMBOL(acpi_disabled);
  50
  51 #ifdef  CONFIG_X86_64
  52
  53 #include <asm/proto.h>
  54
  55 static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return 0; }
  56
  57
  58 #else                           /* X86 */
  59
  60 #ifdef  CONFIG_X86_LOCAL_APIC
  61 #include <mach_apic.h>
  62 #include <mach_mpparse.h>
  63 #endif                          /* CONFIG_X86_LOCAL_APIC */
  64
  65 #endif                          /* X86 */
  66
  67 #define BAD_MADT_ENTRY(entry, end) (                                        \
  68                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  69                 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
  70
  71 #define PREFIX                  "ACPI: "
  72
  73 int acpi_noirq;                         /* skip ACPI IRQ initialization */
  74 int acpi_pci_disabled __initdata;       /* skip ACPI PCI scan and IRQ initialization */
  75 int acpi_ht __initdata = 1;     /* enable HT */
  76
  77 int acpi_lapic;
  78 int acpi_ioapic;
  79 int acpi_strict;
  80 EXPORT_SYMBOL(acpi_strict);
  81
  82 u8 acpi_sci_flags __initdata;
  83 int acpi_sci_override_gsi __initdata;
  84 int acpi_skip_timer_override __initdata;
  85 int acpi_use_timer_override __initdata;
  86
  87 #ifdef CONFIG_X86_LOCAL_APIC
  88 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  89 #endif
  90
  91 #ifndef __HAVE_ARCH_CMPXCHG
  92 #warning ACPI uses CMPXCHG, i486 and later hardware
  93 #endif
  94
  95 #define MAX_MADT_ENTRIES        256
  96 u8 x86_acpiid_to_apicid[MAX_MADT_ENTRIES] =
  97     {[0 ... MAX_MADT_ENTRIES - 1] = 0xff };
  98 EXPORT_SYMBOL(x86_acpiid_to_apicid);
  99
 100 /* --------------------------------------------------------------------------
 101                               Boot-time Configuration
 102    -------------------------------------------------------------------------- */
 103
 104 /*
 105  * The default interrupt routing model is PIC (8259).  This gets
 106  * overriden if IOAPICs are enumerated (below).
 107  */
 108 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
 109
 110 #ifdef  CONFIG_X86_64
 111
 112 /* rely on all ACPI tables being in the direct mapping */
 113 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 114 {
 115         if (!phys_addr || !size)
 116                 return NULL;
 117
 118         if (phys_addr+size <= (end_pfn_map << PAGE_SHIFT) + PAGE_SIZE)
 119                 return __va(phys_addr);
 120
 121         return NULL;
 122 }
 123
 124 #else
 125
 126 /*
 127  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
 128  * to map the target physical address. The problem is that set_fixmap()
 129  * provides a single page, and it is possible that the page is not
 130  * sufficient.
 131  * By using this area, we can map up to MAX_IO_APICS pages temporarily,
 132  * i.e. until the next __va_range() call.
 133  *
 134  * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
 135  * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
 136  * count idx down while incrementing the phys address.
 137  */
 138 char *__acpi_map_table(unsigned long phys, unsigned long size)
 139 {
 140         unsigned long base, offset, mapped_size;
 141         int idx;
 142
 143         if (phys + size < 8 * 1024 * 1024)
 144                 return __va(phys);
 145
 146         offset = phys & (PAGE_SIZE - 1);
 147         mapped_size = PAGE_SIZE - offset;
 148         set_fixmap(FIX_ACPI_END, phys);
 149         base = fix_to_virt(FIX_ACPI_END);
 150
 151         /*
 152          * Most cases can be covered by the below.
 153          */
 154         idx = FIX_ACPI_END;
 155         while (mapped_size < size) {
 156                 if (--idx < FIX_ACPI_BEGIN)
 157                         return NULL;    /* cannot handle this */
 158                 phys += PAGE_SIZE;
 159                 set_fixmap(idx, phys);
 160                 mapped_size += PAGE_SIZE;
 161         }
 162
 163         return ((unsigned char *)base + offset);
 164 }
 165 #endif
 166
 167 #ifdef CONFIG_PCI_MMCONFIG
 168 /* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
 169 struct acpi_table_mcfg_config *pci_mmcfg_config;
 170 int pci_mmcfg_config_num;
 171
 172 int __init acpi_parse_mcfg(struct acpi_table_header *header)
 173 {
 174         struct acpi_table_mcfg *mcfg;
 175         unsigned long i;
 176         int config_size;
 177
 178         if (!header)
 179                 return -EINVAL;
 180
 181         mcfg = (struct acpi_table_mcfg *)header;
 182         if (!mcfg) {
 183                 printk(KERN_WARNING PREFIX "Unable to map MCFG\n");
 184                 return -ENODEV;
 185         }
 186
 187         /* how many config structures do we have */
 188         pci_mmcfg_config_num = 0;
 189         i = header->length - sizeof(struct acpi_table_mcfg);
 190         while (i >= sizeof(struct acpi_table_mcfg_config)) {
 191                 ++pci_mmcfg_config_num;
 192                 i -= sizeof(struct acpi_table_mcfg_config);
 193         };
 194         if (pci_mmcfg_config_num == 0) {
 195                 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
 196                 return -ENODEV;
 197         }
 198
 199         config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
 200         pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
 201         if (!pci_mmcfg_config) {
 202                 printk(KERN_WARNING PREFIX
 203                        "No memory for MCFG config tables\n");
 204                 return -ENOMEM;
 205         }
 206
 207         memcpy(pci_mmcfg_config, &mcfg[1], config_size);
 208         for (i = 0; i < pci_mmcfg_config_num; ++i) {
 209                 if (pci_mmcfg_config[i].base_reserved) {
 210                         printk(KERN_ERR PREFIX
 211                                "MMCONFIG not in low 4GB of memory\n");
 212                         kfree(pci_mmcfg_config);
 213                         pci_mmcfg_config_num = 0;
 214                         return -ENODEV;
 215                 }
 216         }
 217
 218         return 0;
 219 }
 220 #endif                          /* CONFIG_PCI_MMCONFIG */
 221
 222 #ifdef CONFIG_X86_LOCAL_APIC
 223 static int __init acpi_parse_madt(struct acpi_table_header *header)
 224 {
 225         struct acpi_table_madt *madt = NULL;
 226
 227         if (!header|| !cpu_has_apic)
 228                 return -EINVAL;
 229
 230         madt = (struct acpi_table_madt *)header;
 231         if (!madt) {
 232                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
 233                 return -ENODEV;
 234         }
 235
 236         if (madt->address) {
 237                 acpi_lapic_addr = (u64) madt->address;
 238
 239                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
 240                        madt->address);
 241         }
 242
 243         acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
 244
 245         return 0;
 246 }
 247
 248 static int __init
 249 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
 250 {
 251         struct acpi_madt_local_apic *processor = NULL;
 252
 253         processor = (struct acpi_madt_local_apic *)header;
 254
 255         if (BAD_MADT_ENTRY(processor, end))
 256                 return -EINVAL;
 257
 258         acpi_table_print_madt_entry(header);
 259
 260         /* Record local apic id only when enabled */
 261         if (processor->lapic_flags & ACPI_MADT_ENABLED)
 262                 x86_acpiid_to_apicid[processor->processor_id] = processor->id;
 263
 264         /*
 265          * We need to register disabled CPU as well to permit
 266          * counting disabled CPUs. This allows us to size
 267          * cpus_possible_map more accurately, to permit
 268          * to not preallocating memory for all NR_CPUS
 269          * when we use CPU hotplug.
 270          */
 271         mp_register_lapic(processor->id,        /* APIC ID */
 272                           processor->lapic_flags & ACPI_MADT_ENABLED);  /* Enabled? */
 273
 274         return 0;
 275 }
 276
 277 static int __init
 278 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 279                           const unsigned long end)
 280 {
 281         struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
 282
 283         lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
 284
 285         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
 286                 return -EINVAL;
 287
 288         acpi_lapic_addr = lapic_addr_ovr->address;
 289
 290         return 0;
 291 }
 292
 293 static int __init
 294 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 295 {
 296         struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
 297
 298         lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
 299
 300         if (BAD_MADT_ENTRY(lapic_nmi, end))
 301                 return -EINVAL;
 302
 303         acpi_table_print_madt_entry(header);
 304
 305         if (lapic_nmi->lint != 1)
 306                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
 307
 308         return 0;
 309 }
 310
 311 #endif                          /*CONFIG_X86_LOCAL_APIC */
 312
 313 #ifdef CONFIG_X86_IO_APIC
 314
 315 static int __init
 316 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
 317 {
 318         struct acpi_madt_io_apic *ioapic = NULL;
 319
 320         ioapic = (struct acpi_madt_io_apic *)header;
 321
 322         if (BAD_MADT_ENTRY(ioapic, end))
 323                 return -EINVAL;
 324
 325         acpi_table_print_madt_entry(header);
 326
 327         mp_register_ioapic(ioapic->id,
 328                            ioapic->address, ioapic->global_irq_base);
 329
 330         return 0;
 331 }
 332
 333 /*
 334  * Parse Interrupt Source Override for the ACPI SCI
 335  */
 336 static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
 337 {
 338         if (trigger == 0)       /* compatible SCI trigger is level */
 339                 trigger = 3;
 340
 341         if (polarity == 0)      /* compatible SCI polarity is low */
 342                 polarity = 3;
 343
 344         /* Command-line over-ride via acpi_sci= */
 345         if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
 346                 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
 347
 348         if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
 349                 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
 350
 351         /*
 352          * mp_config_acpi_legacy_irqs() already setup IRQs < 16
 353          * If GSI is < 16, this will update its flags,
 354          * else it will create a new mp_irqs[] entry.
 355          */
 356         mp_override_legacy_irq(gsi, polarity, trigger, gsi);
 357
 358         /*
 359          * stash over-ride to indicate we've been here
 360          * and for later update of acpi_gbl_FADT
 361          */
 362         acpi_sci_override_gsi = gsi;
 363         return;
 364 }
 365
 366 static int __init
 367 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 368                        const unsigned long end)
 369 {
 370         struct acpi_madt_interrupt_override *intsrc = NULL;
 371
 372         intsrc = (struct acpi_madt_interrupt_override *)header;
 373
 374         if (BAD_MADT_ENTRY(intsrc, end))
 375                 return -EINVAL;
 376
 377         acpi_table_print_madt_entry(header);
 378
 379         if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
 380                 acpi_sci_ioapic_setup(intsrc->global_irq,
 381                                       intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 382                                       (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 383                 return 0;
 384         }
 385
 386         if (acpi_skip_timer_override &&
 387             intsrc->source_irq == 0 && intsrc->global_irq == 2) {
 388                 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
 389                 return 0;
 390         }
 391
 392         mp_override_legacy_irq(intsrc->source_irq,
 393                                 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 394                                 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
 395                                 intsrc->global_irq);
 396
 397         return 0;
 398 }
 399
 400 static int __init
 401 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 402 {
 403         struct acpi_madt_nmi_source *nmi_src = NULL;
 404
 405         nmi_src = (struct acpi_madt_nmi_source *)header;
 406
 407         if (BAD_MADT_ENTRY(nmi_src, end))
 408                 return -EINVAL;
 409
 410         acpi_table_print_madt_entry(header);
 411
 412         /* TBD: Support nimsrc entries? */
 413
 414         return 0;
 415 }
 416
 417 #endif                          /* CONFIG_X86_IO_APIC */
 418
 419 /*
 420  * acpi_pic_sci_set_trigger()
 421  *
 422  * use ELCR to set PIC-mode trigger type for SCI
 423  *
 424  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 425  * it may require Edge Trigger -- use "acpi_sci=edge"
 426  *
 427  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 428  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 429  * ECLR1 is IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
 430  * ECLR2 is IRQ's 8-15 (IRQ 8, 13 must be 0)
 431  */
 432
 433 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
 434 {
 435         unsigned int mask = 1 << irq;
 436         unsigned int old, new;
 437
 438         /* Real old ELCR mask */
 439         old = inb(0x4d0) | (inb(0x4d1) << 8);
 440
 441         /*
 442          * If we use ACPI to set PCI irq's, then we should clear ELCR
 443          * since we will set it correctly as we enable the PCI irq
 444          * routing.
 445          */
 446         new = acpi_noirq ? old : 0;
 447
 448         /*
 449          * Update SCI information in the ELCR, it isn't in the PCI
 450          * routing tables..
 451          */
 452         switch (trigger) {
 453         case 1:         /* Edge - clear */
 454                 new &= ~mask;
 455                 break;
 456         case 3:         /* Level - set */
 457                 new |= mask;
 458                 break;
 459         }
 460
 461         if (old == new)
 462                 return;
 463
 464         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
 465         outb(new, 0x4d0);
 466         outb(new >> 8, 0x4d1);
 467 }
 468
 469 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 470 {
 471         *irq = gsi;
 472         return 0;
 473 }
 474
 475 /*
 476  * success: return IRQ number (>=0)
 477  * failure: return < 0
 478  */
 479 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 480 {
 481         unsigned int irq;
 482         unsigned int plat_gsi = gsi;
 483
 484 #ifdef CONFIG_PCI
 485         /*
 486          * Make sure all (legacy) PCI IRQs are set as level-triggered.
 487          */
 488         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
 489                 extern void eisa_set_level_irq(unsigned int irq);
 490
 491                 if (triggering == ACPI_LEVEL_SENSITIVE)
 492                         eisa_set_level_irq(gsi);
 493         }
 494 #endif
 495
 496 #ifdef CONFIG_X86_IO_APIC
 497         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
 498                 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
 499         }
 500 #endif
 501         acpi_gsi_to_irq(plat_gsi, &irq);
 502         return irq;
 503 }
 504
 505 EXPORT_SYMBOL(acpi_register_gsi);
 506
 507 /*
 508  *  ACPI based hotplug support for CPU
 509  */
 510 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 511 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 512 {
 513         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 514         union acpi_object *obj;
 515         struct acpi_madt_local_apic *lapic;
 516         cpumask_t tmp_map, new_map;
 517         u8 physid;
 518         int cpu;
 519
 520         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 521                 return -EINVAL;
 522
 523         if (!buffer.length || !buffer.pointer)
 524                 return -EINVAL;
 525
 526         obj = buffer.pointer;
 527         if (obj->type != ACPI_TYPE_BUFFER ||
 528             obj->buffer.length < sizeof(*lapic)) {
 529                 kfree(buffer.pointer);
 530                 return -EINVAL;
 531         }
 532
 533         lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
 534
 535         if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
 536             !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
 537                 kfree(buffer.pointer);
 538                 return -EINVAL;
 539         }
 540
 541         physid = lapic->id;
 542
 543         kfree(buffer.pointer);
 544         buffer.length = ACPI_ALLOCATE_BUFFER;
 545         buffer.pointer = NULL;
 546
 547         tmp_map = cpu_present_map;
 548         mp_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
 549
 550         /*
 551          * If mp_register_lapic successfully generates a new logical cpu
 552          * number, then the following will get us exactly what was mapped
 553          */
 554         cpus_andnot(new_map, cpu_present_map, tmp_map);
 555         if (cpus_empty(new_map)) {
 556                 printk ("Unable to map lapic to logical cpu number\n");
 557                 return -EINVAL;
 558         }
 559
 560         cpu = first_cpu(new_map);
 561
 562         *pcpu = cpu;
 563         return 0;
 564 }
 565
 566 EXPORT_SYMBOL(acpi_map_lsapic);
 567
 568 int acpi_unmap_lsapic(int cpu)
 569 {
 570         int i;
 571
 572         for_each_possible_cpu(i) {
 573                 if (x86_acpiid_to_apicid[i] == x86_cpu_to_apicid[cpu]) {
 574                         x86_acpiid_to_apicid[i] = -1;
 575                         break;
 576                 }
 577         }
 578         x86_cpu_to_apicid[cpu] = -1;
 579         cpu_clear(cpu, cpu_present_map);
 580         num_processors--;
 581
 582         return (0);
 583 }
 584
 585 EXPORT_SYMBOL(acpi_unmap_lsapic);
 586 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 587
 588 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 589 {
 590         /* TBD */
 591         return -EINVAL;
 592 }
 593
 594 EXPORT_SYMBOL(acpi_register_ioapic);
 595
 596 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 597 {
 598         /* TBD */
 599         return -EINVAL;
 600 }
 601
 602 EXPORT_SYMBOL(acpi_unregister_ioapic);
 603
 604 static unsigned long __init
 605 acpi_scan_rsdp(unsigned long start, unsigned long length)
 606 {
 607         unsigned long offset = 0;
 608         unsigned long sig_len = sizeof("RSD PTR ") - 1;
 609
 610         /*
 611          * Scan all 16-byte boundaries of the physical memory region for the
 612          * RSDP signature.
 613          */
 614         for (offset = 0; offset < length; offset += 16) {
 615                 if (strncmp((char *)(phys_to_virt(start) + offset), "RSD PTR ", sig_len))
 616                         continue;
 617                 return (start + offset);
 618         }
 619
 620         return 0;
 621 }
 622
 623 static int __init acpi_parse_sbf(struct acpi_table_header *table)
 624 {
 625         struct acpi_table_boot *sb;
 626
 627         sb = (struct acpi_table_boot *)table;
 628         if (!sb) {
 629                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
 630                 return -ENODEV;
 631         }
 632
 633         sbf_port = sb->cmos_index;      /* Save CMOS port */
 634
 635         return 0;
 636 }
 637
 638 #ifdef CONFIG_HPET_TIMER
 639
 640 static int __init acpi_parse_hpet(struct acpi_table_header *table)
 641 {
 642         struct acpi_table_hpet *hpet_tbl;
 643         struct resource *hpet_res;
 644         resource_size_t res_start;
 645
 646         hpet_tbl = (struct acpi_table_hpet *)table;
 647         if (!hpet_tbl) {
 648                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
 649                 return -ENODEV;
 650         }
 651
 652         if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
 653                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 654                        "memory.\n");
 655                 return -1;
 656         }
 657
 658 #define HPET_RESOURCE_NAME_SIZE 9
 659         hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
 660         if (hpet_res) {
 661                 memset(hpet_res, 0, sizeof(*hpet_res));
 662                 hpet_res->name = (void *)&hpet_res[1];
 663                 hpet_res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 664                 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE,
 665                          "HPET %u", hpet_tbl->sequence);
 666                 hpet_res->end = (1 * 1024) - 1;
 667         }
 668
 669 #ifdef CONFIG_X86_64
 670         vxtime.hpet_address = hpet_tbl->address.address;
 671
 672         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 673                 hpet_tbl->id, vxtime.hpet_address);
 674
 675         res_start = vxtime.hpet_address;
 676 #else                          /* X86 */
 677         {
 678                 extern unsigned long hpet_address;
 679
 680                 hpet_address = hpet_tbl->address.address;
 681                 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 682                         hpet_tbl->id, hpet_address);
 683
 684                 res_start = hpet_address;
 685         }
 686 #endif                         /* X86 */
 687
 688         if (hpet_res) {
 689                 hpet_res->start = res_start;
 690                 hpet_res->end += res_start;
 691                 insert_resource(&iomem_resource, hpet_res);
 692         }
 693
 694         return 0;
 695 }
 696 #else
 697 #define acpi_parse_hpet NULL
 698 #endif
 699
 700 #ifdef CONFIG_X86_PM_TIMER
 701 extern u32 pmtmr_ioport;
 702 #endif
 703
 704 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 705 {
 706
 707 #ifdef CONFIG_X86_PM_TIMER
 708         /* detect the location of the ACPI PM Timer */
 709         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
 710                 /* FADT rev. 2 */
 711                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
 712                     ACPI_ADR_SPACE_SYSTEM_IO)
 713                         return 0;
 714
 715                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
 716                 /*
 717                  * "X" fields are optional extensions to the original V1.0
 718                  * fields, so we must selectively expand V1.0 fields if the
 719                  * corresponding X field is zero.
 720                  */
 721                 if (!pmtmr_ioport)
 722                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 723         } else {
 724                 /* FADT rev. 1 */
 725                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 726         }
 727         if (pmtmr_ioport)
 728                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 729                        pmtmr_ioport);
 730 #endif
 731         return 0;
 732 }
 733
 734 unsigned long __init acpi_find_rsdp(void)
 735 {
 736         unsigned long rsdp_phys = 0;
 737
 738         if (efi_enabled) {
 739                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 740                         return efi.acpi20;
 741                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 742                         return efi.acpi;
 743         }
 744         /*
 745          * Scan memory looking for the RSDP signature. First search EBDA (low
 746          * memory) paragraphs and then search upper memory (E0000-FFFFF).
 747          */
 748         rsdp_phys = acpi_scan_rsdp(0, 0x400);
 749         if (!rsdp_phys)
 750                 rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);
 751
 752         return rsdp_phys;
 753 }
 754
 755 #ifdef  CONFIG_X86_LOCAL_APIC
 756 /*
 757  * Parse LAPIC entries in MADT
 758  * returns 0 on success, < 0 on error
 759  */
 760 static int __init acpi_parse_madt_lapic_entries(void)
 761 {
 762         int count;
 763
 764         if (!cpu_has_apic)
 765                 return -ENODEV;
 766
 767         /*
 768          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 769          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 770          */
 771
 772         count =
 773             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
 774                                   acpi_parse_lapic_addr_ovr, 0);
 775         if (count < 0) {
 776                 printk(KERN_ERR PREFIX
 777                        "Error parsing LAPIC address override entry\n");
 778                 return count;
 779         }
 780
 781         mp_register_lapic_address(acpi_lapic_addr);
 782
 783         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC, acpi_parse_lapic,
 784                                       MAX_APICS);
 785         if (!count) {
 786                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 787                 /* TBD: Cleanup to allow fallback to MPS */
 788                 return -ENODEV;
 789         } else if (count < 0) {
 790                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 791                 /* TBD: Cleanup to allow fallback to MPS */
 792                 return count;
 793         }
 794
 795         count =
 796             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
 797         if (count < 0) {
 798                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 799                 /* TBD: Cleanup to allow fallback to MPS */
 800                 return count;
 801         }
 802         return 0;
 803 }
 804 #endif                          /* CONFIG_X86_LOCAL_APIC */
 805
 806 #ifdef  CONFIG_X86_IO_APIC
 807 /*
 808  * Parse IOAPIC related entries in MADT
 809  * returns 0 on success, < 0 on error
 810  */
 811 static int __init acpi_parse_madt_ioapic_entries(void)
 812 {
 813         int count;
 814
 815         /*
 816          * ACPI interpreter is required to complete interrupt setup,
 817          * so if it is off, don't enumerate the io-apics with ACPI.
 818          * If MPS is present, it will handle them,
 819          * otherwise the system will stay in PIC mode
 820          */
 821         if (acpi_disabled || acpi_noirq) {
 822                 return -ENODEV;
 823         }
 824
 825         if (!cpu_has_apic)
 826                 return -ENODEV;
 827
 828         /*
 829          * if "noapic" boot option, don't look for IO-APICs
 830          */
 831         if (skip_ioapic_setup) {
 832                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 833                        "due to 'noapic' option.\n");
 834                 return -ENODEV;
 835         }
 836
 837         count =
 838             acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
 839                                   MAX_IO_APICS);
 840         if (!count) {
 841                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 842                 return -ENODEV;
 843         } else if (count < 0) {
 844                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 845                 return count;
 846         }
 847
 848         count =
 849             acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
 850                                   NR_IRQ_VECTORS);
 851         if (count < 0) {
 852                 printk(KERN_ERR PREFIX
 853                        "Error parsing interrupt source overrides entry\n");
 854                 /* TBD: Cleanup to allow fallback to MPS */
 855                 return count;
 856         }
 857
 858         /*
 859          * If BIOS did not supply an INT_SRC_OVR for the SCI
 860          * pretend we got one so we can set the SCI flags.
 861          */
 862         if (!acpi_sci_override_gsi)
 863                 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
 864
 865         /* Fill in identity legacy mapings where no override */
 866         mp_config_acpi_legacy_irqs();
 867
 868         count =
 869             acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
 870                                   NR_IRQ_VECTORS);
 871         if (count < 0) {
 872                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 873                 /* TBD: Cleanup to allow fallback to MPS */
 874                 return count;
 875         }
 876
 877         return 0;
 878 }
 879 #else
 880 static inline int acpi_parse_madt_ioapic_entries(void)
 881 {
 882         return -1;
 883 }
 884 #endif  /* !CONFIG_X86_IO_APIC */
 885
 886 static void __init acpi_process_madt(void)
 887 {
 888 #ifdef CONFIG_X86_LOCAL_APIC
 889         int count, error;
 890
 891         count = acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt);
 892         if (count >= 1) {
 893
 894                 /*
 895                  * Parse MADT LAPIC entries
 896                  */
 897                 error = acpi_parse_madt_lapic_entries();
 898                 if (!error) {
 899                         acpi_lapic = 1;
 900
 901 #ifdef CONFIG_X86_GENERICARCH
 902                         generic_bigsmp_probe();
 903 #endif
 904                         /*
 905                          * Parse MADT IO-APIC entries
 906                          */
 907                         error = acpi_parse_madt_ioapic_entries();
 908                         if (!error) {
 909                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 910                                 acpi_irq_balance_set(NULL);
 911                                 acpi_ioapic = 1;
 912
 913                                 smp_found_config = 1;
 914                                 clustered_apic_check();
 915                         }
 916                 }
 917                 if (error == -EINVAL) {
 918                         /*
 919                          * Dell Precision Workstation 410, 610 come here.
 920                          */
 921                         printk(KERN_ERR PREFIX
 922                                "Invalid BIOS MADT, disabling ACPI\n");
 923                         disable_acpi();
 924                 }
 925         }
 926 #endif
 927         return;
 928 }
 929
 930 #ifdef __i386__
 931
 932 static int __init disable_acpi_irq(struct dmi_system_id *d)
 933 {
 934         if (!acpi_force) {
 935                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
 936                        d->ident);
 937                 acpi_noirq_set();
 938         }
 939         return 0;
 940 }
 941
 942 static int __init disable_acpi_pci(struct dmi_system_id *d)
 943 {
 944         if (!acpi_force) {
 945                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
 946                        d->ident);
 947                 acpi_disable_pci();
 948         }
 949         return 0;
 950 }
 951
 952 static int __init dmi_disable_acpi(struct dmi_system_id *d)
 953 {
 954         if (!acpi_force) {
 955                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
 956                 disable_acpi();
 957         } else {
 958                 printk(KERN_NOTICE
 959                        "Warning: DMI blacklist says broken, but acpi forced\n");
 960         }
 961         return 0;
 962 }
 963
 964 /*
 965  * Limit ACPI to CPU enumeration for HT
 966  */
 967 static int __init force_acpi_ht(struct dmi_system_id *d)
 968 {
 969         if (!acpi_force) {
 970                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
 971                        d->ident);
 972                 disable_acpi();
 973                 acpi_ht = 1;
 974         } else {
 975                 printk(KERN_NOTICE
 976                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
 977         }
 978         return 0;
 979 }
 980
 981 /*
 982  * If your system is blacklisted here, but you find that acpi=force
 983  * works for you, please contact acpi-devel@sourceforge.net
 984  */
 985 static struct dmi_system_id __initdata acpi_dmi_table[] = {
 986         /*
 987          * Boxes that need ACPI disabled
 988          */
 989         {
 990          .callback = dmi_disable_acpi,
 991          .ident = "IBM Thinkpad",
 992          .matches = {
 993                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
 994                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
 995                      },
 996          },
 997
 998         /*
 999          * Boxes that need acpi=ht
1000          */
1001         {
1002          .callback = force_acpi_ht,
1003          .ident = "FSC Primergy T850",
1004          .matches = {
1005                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1006                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
1007                      },
1008          },
1009         {
1010          .callback = force_acpi_ht,
1011          .ident = "DELL GX240",
1012          .matches = {
1013                      DMI_MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
1014                      DMI_MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
1015                      },
1016          },
1017         {
1018          .callback = force_acpi_ht,
1019          .ident = "HP VISUALIZE NT Workstation",
1020          .matches = {
1021                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1022                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1023                      },
1024          },
1025         {
1026          .callback = force_acpi_ht,
1027          .ident = "Compaq Workstation W8000",
1028          .matches = {
1029                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1030                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1031                      },
1032          },
1033         {
1034          .callback = force_acpi_ht,
1035          .ident = "ASUS P4B266",
1036          .matches = {
1037                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1038                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1039                      },
1040          },
1041         {
1042          .callback = force_acpi_ht,
1043          .ident = "ASUS P2B-DS",
1044          .matches = {
1045                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1046                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1047                      },
1048          },
1049         {
1050          .callback = force_acpi_ht,
1051          .ident = "ASUS CUR-DLS",
1052          .matches = {
1053                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1054                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1055                      },
1056          },
1057         {
1058          .callback = force_acpi_ht,
1059          .ident = "ABIT i440BX-W83977",
1060          .matches = {
1061                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1062                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1063                      },
1064          },
1065         {
1066          .callback = force_acpi_ht,
1067          .ident = "IBM Bladecenter",
1068          .matches = {
1069                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1070                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1071                      },
1072          },
1073         {
1074          .callback = force_acpi_ht,
1075          .ident = "IBM eServer xSeries 360",
1076          .matches = {
1077                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1078                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1079                      },
1080          },
1081         {
1082          .callback = force_acpi_ht,
1083          .ident = "IBM eserver xSeries 330",
1084          .matches = {
1085                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1086                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1087                      },
1088          },
1089         {
1090          .callback = force_acpi_ht,
1091          .ident = "IBM eserver xSeries 440",
1092          .matches = {
1093                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1094                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1095                      },
1096          },
1097
1098         /*
1099          * Boxes that need ACPI PCI IRQ routing disabled
1100          */
1101         {
1102          .callback = disable_acpi_irq,
1103          .ident = "ASUS A7V",
1104          .matches = {
1105                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1106                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1107                      /* newer BIOS, Revision 1011, does work */
1108                      DMI_MATCH(DMI_BIOS_VERSION,
1109                                "ASUS A7V ACPI BIOS Revision 1007"),
1110                      },
1111          },
1112
1113         /*
1114          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1115          */
1116         {                       /* _BBN 0 bug */
1117          .callback = disable_acpi_pci,
1118          .ident = "ASUS PR-DLS",
1119          .matches = {
1120                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1121                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1122                      DMI_MATCH(DMI_BIOS_VERSION,
1123                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1124                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1125                      },
1126          },
1127         {
1128          .callback = disable_acpi_pci,
1129          .ident = "Acer TravelMate 36x Laptop",
1130          .matches = {
1131                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1132                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1133                      },
1134          },
1135         {}
1136 };
1137
1138 #endif                          /* __i386__ */
1139
1140 /*
1141  * acpi_boot_table_init() and acpi_boot_init()
1142  *  called from setup_arch(), always.
1143  *      1. checksums all tables
1144  *      2. enumerates lapics
1145  *      3. enumerates io-apics
1146  *
1147  * acpi_table_init() is separate to allow reading SRAT without
1148  * other side effects.
1149  *
1150  * side effects of acpi_boot_init:
1151  *      acpi_lapic = 1 if LAPIC found
1152  *      acpi_ioapic = 1 if IOAPIC found
1153  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1154  *      if acpi_blacklisted() acpi_disabled = 1;
1155  *      acpi_irq_model=...
1156  *      ...
1157  *
1158  * return value: (currently ignored)
1159  *      0: success
1160  *      !0: failure
1161  */
1162
1163 int __init acpi_boot_table_init(void)
1164 {
1165         int error;
1166
1167 #ifdef __i386__
1168         dmi_check_system(acpi_dmi_table);
1169 #endif
1170
1171         /*
1172          * If acpi_disabled, bail out
1173          * One exception: acpi=ht continues far enough to enumerate LAPICs
1174          */
1175         if (acpi_disabled && !acpi_ht)
1176                 return 1;
1177
1178         /*
1179          * Initialize the ACPI boot-time table parser.
1180          */
1181         error = acpi_table_init();
1182         if (error) {
1183                 disable_acpi();
1184                 return error;
1185         }
1186
1187         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1188
1189         /*
1190          * blacklist may disable ACPI entirely
1191          */
1192         error = acpi_blacklisted();
1193         if (error) {
1194                 if (acpi_force) {
1195                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1196                 } else {
1197                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1198                         disable_acpi();
1199                         return error;
1200                 }
1201         }
1202
1203         return 0;
1204 }
1205
1206 int __init acpi_boot_init(void)
1207 {
1208         /*
1209          * If acpi_disabled, bail out
1210          * One exception: acpi=ht continues far enough to enumerate LAPICs
1211          */
1212         if (acpi_disabled && !acpi_ht)
1213                 return 1;
1214
1215         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1216
1217         /*
1218          * set sci_int and PM timer address
1219          */
1220         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1221
1222         /*
1223          * Process the Multiple APIC Description Table (MADT), if present
1224          */
1225         acpi_process_madt();
1226
1227         acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1228
1229         return 0;
1230 }
1231
1232 static int __init parse_acpi(char *arg)
1233 {
1234         if (!arg)
1235                 return -EINVAL;
1236
1237         /* "acpi=off" disables both ACPI table parsing and interpreter */
1238         if (strcmp(arg, "off") == 0) {
1239                 disable_acpi();
1240         }
1241         /* acpi=force to over-ride black-list */
1242         else if (strcmp(arg, "force") == 0) {
1243                 acpi_force = 1;
1244                 acpi_ht = 1;
1245                 acpi_disabled = 0;
1246         }
1247         /* acpi=strict disables out-of-spec workarounds */
1248         else if (strcmp(arg, "strict") == 0) {
1249                 acpi_strict = 1;
1250         }
1251         /* Limit ACPI just to boot-time to enable HT */
1252         else if (strcmp(arg, "ht") == 0) {
1253                 if (!acpi_force)
1254                         disable_acpi();
1255                 acpi_ht = 1;
1256         }
1257         /* "acpi=noirq" disables ACPI interrupt routing */
1258         else if (strcmp(arg, "noirq") == 0) {
1259                 acpi_noirq_set();
1260         } else {
1261                 /* Core will printk when we return error. */
1262                 return -EINVAL;
1263         }
1264         return 0;
1265 }
1266 early_param("acpi", parse_acpi);
1267
1268 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1269 static int __init parse_pci(char *arg)
1270 {
1271         if (arg && strcmp(arg, "noacpi") == 0)
1272                 acpi_disable_pci();
1273         return 0;
1274 }
1275 early_param("pci", parse_pci);
1276
1277 #ifdef CONFIG_X86_IO_APIC
1278 static int __init parse_acpi_skip_timer_override(char *arg)
1279 {
1280         acpi_skip_timer_override = 1;
1281         return 0;
1282 }
1283 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1284
1285 static int __init parse_acpi_use_timer_override(char *arg)
1286 {
1287         acpi_use_timer_override = 1;
1288         return 0;
1289 }
1290 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1291 #endif /* CONFIG_X86_IO_APIC */
1292
1293 static int __init setup_acpi_sci(char *s)
1294 {
1295         if (!s)
1296                 return -EINVAL;
1297         if (!strcmp(s, "edge"))
1298                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1299                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1300         else if (!strcmp(s, "level"))
1301                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1302                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1303         else if (!strcmp(s, "high"))
1304                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1305                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1306         else if (!strcmp(s, "low"))
1307                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1308                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1309         else
1310                 return -EINVAL;
1311         return 0;
1312 }
1313 early_param("acpi_sci", setup_acpi_sci);
1314
1315 int __acpi_acquire_global_lock(unsigned int *lock)
1316 {
1317         unsigned int old, new, val;
1318         do {
1319                 old = *lock;
1320                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1321                 val = cmpxchg(lock, old, new);
1322         } while (unlikely (val != old));
1323         return (new < 3) ? -1 : 0;
1324 }
1325
1326 int __acpi_release_global_lock(unsigned int *lock)
1327 {
1328         unsigned int old, new, val;
1329         do {
1330                 old = *lock;
1331                 new = old & ~0x3;
1332                 val = cmpxchg(lock, old, new);
1333         } while (unlikely (val != old));
1334         return old & 0x1;
1335 }