arch/x86/kernel/acpi/boot.c

   1 /*
   2  *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/init.h>
  27 #include <linux/acpi.h>
  28 #include <linux/acpi_pmtmr.h>
  29 #include <linux/efi.h>
  30 #include <linux/cpumask.h>
  31 #include <linux/module.h>
  32 #include <linux/dmi.h>
  33 #include <linux/irq.h>
  34 #include <linux/bootmem.h>
  35 #include <linux/ioport.h>
  36
  37 #include <asm/pgtable.h>
  38 #include <asm/io_apic.h>
  39 #include <asm/apic.h>
  40 #include <asm/io.h>
  41 #include <asm/mpspec.h>
  42
  43 #ifdef CONFIG_X86_LOCAL_APIC
  44 # include <mach_apic.h>
  45 #endif
  46
  47 static int __initdata acpi_force = 0;
  48
  49 #ifdef  CONFIG_ACPI
  50 int acpi_disabled = 0;
  51 #else
  52 int acpi_disabled = 1;
  53 #endif
  54 EXPORT_SYMBOL(acpi_disabled);
  55
  56 #ifdef  CONFIG_X86_64
  57
  58 #include <asm/proto.h>
  59 #include <asm/genapic.h>
  60
  61 #else                           /* X86 */
  62
  63 #ifdef  CONFIG_X86_LOCAL_APIC
  64 #include <mach_apic.h>
  65 #include <mach_mpparse.h>
  66 #endif                          /* CONFIG_X86_LOCAL_APIC */
  67
  68 #endif                          /* X86 */
  69
  70 #define BAD_MADT_ENTRY(entry, end) (                                        \
  71                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  72                 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
  73
  74 #define PREFIX                  "ACPI: "
  75
  76 int acpi_noirq;                         /* skip ACPI IRQ initialization */
  77 int acpi_pci_disabled;          /* skip ACPI PCI scan and IRQ initialization */
  78 EXPORT_SYMBOL(acpi_pci_disabled);
  79 int acpi_ht __initdata = 1;     /* enable HT */
  80
  81 int acpi_lapic;
  82 int acpi_ioapic;
  83 int acpi_strict;
  84
  85 u8 acpi_sci_flags __initdata;
  86 int acpi_sci_override_gsi __initdata;
  87 int acpi_skip_timer_override __initdata;
  88 int acpi_use_timer_override __initdata;
  89
  90 #ifdef CONFIG_X86_LOCAL_APIC
  91 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  92 #endif
  93
  94 #ifndef __HAVE_ARCH_CMPXCHG
  95 #warning ACPI uses CMPXCHG, i486 and later hardware
  96 #endif
  97
  98 /* --------------------------------------------------------------------------
  99                               Boot-time Configuration
 100    -------------------------------------------------------------------------- */
 101
 102 /*
 103  * The default interrupt routing model is PIC (8259).  This gets
 104  * overridden if IOAPICs are enumerated (below).
 105  */
 106 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
 107
 108 #ifdef  CONFIG_X86_64
 109
 110 /* rely on all ACPI tables being in the direct mapping */
 111 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
 112 {
 113         if (!phys_addr || !size)
 114                 return NULL;
 115
 116         if (phys_addr+size <= (max_pfn_mapped << PAGE_SHIFT) + PAGE_SIZE)
 117                 return __va(phys_addr);
 118
 119         return NULL;
 120 }
 121
 122 #else
 123
 124 /*
 125  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
 126  * to map the target physical address. The problem is that set_fixmap()
 127  * provides a single page, and it is possible that the page is not
 128  * sufficient.
 129  * By using this area, we can map up to MAX_IO_APICS pages temporarily,
 130  * i.e. until the next __va_range() call.
 131  *
 132  * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
 133  * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
 134  * count idx down while incrementing the phys address.
 135  */
 136 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
 137 {
 138         unsigned long base, offset, mapped_size;
 139         int idx;
 140
 141         if (phys + size < 8 * 1024 * 1024)
 142                 return __va(phys);
 143
 144         offset = phys & (PAGE_SIZE - 1);
 145         mapped_size = PAGE_SIZE - offset;
 146         set_fixmap(FIX_ACPI_END, phys);
 147         base = fix_to_virt(FIX_ACPI_END);
 148
 149         /*
 150          * Most cases can be covered by the below.
 151          */
 152         idx = FIX_ACPI_END;
 153         while (mapped_size < size) {
 154                 if (--idx < FIX_ACPI_BEGIN)
 155                         return NULL;    /* cannot handle this */
 156                 phys += PAGE_SIZE;
 157                 set_fixmap(idx, phys);
 158                 mapped_size += PAGE_SIZE;
 159         }
 160
 161         return ((unsigned char *)base + offset);
 162 }
 163 #endif
 164
 165 #ifdef CONFIG_PCI_MMCONFIG
 166 /* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
 167 struct acpi_mcfg_allocation *pci_mmcfg_config;
 168 int pci_mmcfg_config_num;
 169
 170 int __init acpi_parse_mcfg(struct acpi_table_header *header)
 171 {
 172         struct acpi_table_mcfg *mcfg;
 173         unsigned long i;
 174         int config_size;
 175
 176         if (!header)
 177                 return -EINVAL;
 178
 179         mcfg = (struct acpi_table_mcfg *)header;
 180
 181         /* how many config structures do we have */
 182         pci_mmcfg_config_num = 0;
 183         i = header->length - sizeof(struct acpi_table_mcfg);
 184         while (i >= sizeof(struct acpi_mcfg_allocation)) {
 185                 ++pci_mmcfg_config_num;
 186                 i -= sizeof(struct acpi_mcfg_allocation);
 187         };
 188         if (pci_mmcfg_config_num == 0) {
 189                 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
 190                 return -ENODEV;
 191         }
 192
 193         config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
 194         pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
 195         if (!pci_mmcfg_config) {
 196                 printk(KERN_WARNING PREFIX
 197                        "No memory for MCFG config tables\n");
 198                 return -ENOMEM;
 199         }
 200
 201         memcpy(pci_mmcfg_config, &mcfg[1], config_size);
 202         for (i = 0; i < pci_mmcfg_config_num; ++i) {
 203                 if (pci_mmcfg_config[i].address > 0xFFFFFFFF) {
 204                         printk(KERN_ERR PREFIX
 205                                "MMCONFIG not in low 4GB of memory\n");
 206                         kfree(pci_mmcfg_config);
 207                         pci_mmcfg_config_num = 0;
 208                         return -ENODEV;
 209                 }
 210         }
 211
 212         return 0;
 213 }
 214 #endif                          /* CONFIG_PCI_MMCONFIG */
 215
 216 #ifdef CONFIG_X86_LOCAL_APIC
 217 static int __init acpi_parse_madt(struct acpi_table_header *table)
 218 {
 219         struct acpi_table_madt *madt = NULL;
 220
 221         if (!cpu_has_apic)
 222                 return -EINVAL;
 223
 224         madt = (struct acpi_table_madt *)table;
 225         if (!madt) {
 226                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
 227                 return -ENODEV;
 228         }
 229
 230         if (madt->address) {
 231                 acpi_lapic_addr = (u64) madt->address;
 232
 233                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
 234                        madt->address);
 235         }
 236
 237         acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
 238
 239         return 0;
 240 }
 241
 242 static int __init
 243 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
 244 {
 245         struct acpi_madt_local_apic *processor = NULL;
 246
 247         processor = (struct acpi_madt_local_apic *)header;
 248
 249         if (BAD_MADT_ENTRY(processor, end))
 250                 return -EINVAL;
 251
 252         acpi_table_print_madt_entry(header);
 253
 254         /*
 255          * We need to register disabled CPU as well to permit
 256          * counting disabled CPUs. This allows us to size
 257          * cpus_possible_map more accurately, to permit
 258          * to not preallocating memory for all NR_CPUS
 259          * when we use CPU hotplug.
 260          */
 261         mp_register_lapic(processor->id,        /* APIC ID */
 262                           processor->lapic_flags & ACPI_MADT_ENABLED);  /* Enabled? */
 263
 264         return 0;
 265 }
 266
 267 static int __init
 268 acpi_parse_sapic(struct acpi_subtable_header *header, const unsigned long end)
 269 {
 270         struct acpi_madt_local_sapic *processor = NULL;
 271
 272         processor = (struct acpi_madt_local_sapic *)header;
 273
 274         if (BAD_MADT_ENTRY(processor, end))
 275                 return -EINVAL;
 276
 277         acpi_table_print_madt_entry(header);
 278
 279         mp_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
 280                 processor->lapic_flags & ACPI_MADT_ENABLED);    /* Enabled? */
 281
 282         return 0;
 283 }
 284
 285 static int __init
 286 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 287                           const unsigned long end)
 288 {
 289         struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
 290
 291         lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
 292
 293         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
 294                 return -EINVAL;
 295
 296         acpi_lapic_addr = lapic_addr_ovr->address;
 297
 298         return 0;
 299 }
 300
 301 static int __init
 302 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 303 {
 304         struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
 305
 306         lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
 307
 308         if (BAD_MADT_ENTRY(lapic_nmi, end))
 309                 return -EINVAL;
 310
 311         acpi_table_print_madt_entry(header);
 312
 313         if (lapic_nmi->lint != 1)
 314                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
 315
 316         return 0;
 317 }
 318
 319 #endif                          /*CONFIG_X86_LOCAL_APIC */
 320
 321 #ifdef CONFIG_X86_IO_APIC
 322
 323 struct mp_ioapic_routing mp_ioapic_routing[MAX_IO_APICS];
 324
 325 static int __init
 326 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
 327 {
 328         struct acpi_madt_io_apic *ioapic = NULL;
 329
 330         ioapic = (struct acpi_madt_io_apic *)header;
 331
 332         if (BAD_MADT_ENTRY(ioapic, end))
 333                 return -EINVAL;
 334
 335         acpi_table_print_madt_entry(header);
 336
 337         mp_register_ioapic(ioapic->id,
 338                            ioapic->address, ioapic->global_irq_base);
 339
 340         return 0;
 341 }
 342
 343 /*
 344  * Parse Interrupt Source Override for the ACPI SCI
 345  */
 346 static void __init acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
 347 {
 348         if (trigger == 0)       /* compatible SCI trigger is level */
 349                 trigger = 3;
 350
 351         if (polarity == 0)      /* compatible SCI polarity is low */
 352                 polarity = 3;
 353
 354         /* Command-line over-ride via acpi_sci= */
 355         if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
 356                 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
 357
 358         if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
 359                 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
 360
 361         /*
 362          * mp_config_acpi_legacy_irqs() already setup IRQs < 16
 363          * If GSI is < 16, this will update its flags,
 364          * else it will create a new mp_irqs[] entry.
 365          */
 366         mp_override_legacy_irq(gsi, polarity, trigger, gsi);
 367
 368         /*
 369          * stash over-ride to indicate we've been here
 370          * and for later update of acpi_gbl_FADT
 371          */
 372         acpi_sci_override_gsi = gsi;
 373         return;
 374 }
 375
 376 static int __init
 377 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 378                        const unsigned long end)
 379 {
 380         struct acpi_madt_interrupt_override *intsrc = NULL;
 381
 382         intsrc = (struct acpi_madt_interrupt_override *)header;
 383
 384         if (BAD_MADT_ENTRY(intsrc, end))
 385                 return -EINVAL;
 386
 387         acpi_table_print_madt_entry(header);
 388
 389         if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
 390                 acpi_sci_ioapic_setup(intsrc->global_irq,
 391                                       intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 392                                       (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 393                 return 0;
 394         }
 395
 396         if (acpi_skip_timer_override &&
 397             intsrc->source_irq == 0 && intsrc->global_irq == 2) {
 398                 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
 399                 return 0;
 400         }
 401
 402         mp_override_legacy_irq(intsrc->source_irq,
 403                                 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 404                                 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
 405                                 intsrc->global_irq);
 406
 407         return 0;
 408 }
 409
 410 static int __init
 411 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 412 {
 413         struct acpi_madt_nmi_source *nmi_src = NULL;
 414
 415         nmi_src = (struct acpi_madt_nmi_source *)header;
 416
 417         if (BAD_MADT_ENTRY(nmi_src, end))
 418                 return -EINVAL;
 419
 420         acpi_table_print_madt_entry(header);
 421
 422         /* TBD: Support nimsrc entries? */
 423
 424         return 0;
 425 }
 426
 427 #endif                          /* CONFIG_X86_IO_APIC */
 428
 429 /*
 430  * acpi_pic_sci_set_trigger()
 431  *
 432  * use ELCR to set PIC-mode trigger type for SCI
 433  *
 434  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 435  * it may require Edge Trigger -- use "acpi_sci=edge"
 436  *
 437  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 438  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 439  * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
 440  * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
 441  */
 442
 443 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
 444 {
 445         unsigned int mask = 1 << irq;
 446         unsigned int old, new;
 447
 448         /* Real old ELCR mask */
 449         old = inb(0x4d0) | (inb(0x4d1) << 8);
 450
 451         /*
 452          * If we use ACPI to set PCI IRQs, then we should clear ELCR
 453          * since we will set it correctly as we enable the PCI irq
 454          * routing.
 455          */
 456         new = acpi_noirq ? old : 0;
 457
 458         /*
 459          * Update SCI information in the ELCR, it isn't in the PCI
 460          * routing tables..
 461          */
 462         switch (trigger) {
 463         case 1:         /* Edge - clear */
 464                 new &= ~mask;
 465                 break;
 466         case 3:         /* Level - set */
 467                 new |= mask;
 468                 break;
 469         }
 470
 471         if (old == new)
 472                 return;
 473
 474         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
 475         outb(new, 0x4d0);
 476         outb(new >> 8, 0x4d1);
 477 }
 478
 479 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 480 {
 481         *irq = gsi;
 482         return 0;
 483 }
 484
 485 /*
 486  * success: return IRQ number (>=0)
 487  * failure: return < 0
 488  */
 489 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 490 {
 491         unsigned int irq;
 492         unsigned int plat_gsi = gsi;
 493
 494 #ifdef CONFIG_PCI
 495         /*
 496          * Make sure all (legacy) PCI IRQs are set as level-triggered.
 497          */
 498         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
 499                 extern void eisa_set_level_irq(unsigned int irq);
 500
 501                 if (triggering == ACPI_LEVEL_SENSITIVE)
 502                         eisa_set_level_irq(gsi);
 503         }
 504 #endif
 505
 506 #ifdef CONFIG_X86_IO_APIC
 507         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
 508                 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
 509         }
 510 #endif
 511         acpi_gsi_to_irq(plat_gsi, &irq);
 512         return irq;
 513 }
 514
 515 /*
 516  *  ACPI based hotplug support for CPU
 517  */
 518 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 519
 520 static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
 521 {
 522         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 523         union acpi_object *obj;
 524         struct acpi_madt_local_apic *lapic;
 525         cpumask_t tmp_map, new_map;
 526         u8 physid;
 527         int cpu;
 528
 529         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 530                 return -EINVAL;
 531
 532         if (!buffer.length || !buffer.pointer)
 533                 return -EINVAL;
 534
 535         obj = buffer.pointer;
 536         if (obj->type != ACPI_TYPE_BUFFER ||
 537             obj->buffer.length < sizeof(*lapic)) {
 538                 kfree(buffer.pointer);
 539                 return -EINVAL;
 540         }
 541
 542         lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
 543
 544         if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
 545             !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
 546                 kfree(buffer.pointer);
 547                 return -EINVAL;
 548         }
 549
 550         physid = lapic->id;
 551
 552         kfree(buffer.pointer);
 553         buffer.length = ACPI_ALLOCATE_BUFFER;
 554         buffer.pointer = NULL;
 555
 556         tmp_map = cpu_present_map;
 557         mp_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
 558
 559         /*
 560          * If mp_register_lapic successfully generates a new logical cpu
 561          * number, then the following will get us exactly what was mapped
 562          */
 563         cpus_andnot(new_map, cpu_present_map, tmp_map);
 564         if (cpus_empty(new_map)) {
 565                 printk ("Unable to map lapic to logical cpu number\n");
 566                 return -EINVAL;
 567         }
 568
 569         cpu = first_cpu(new_map);
 570
 571         *pcpu = cpu;
 572         return 0;
 573 }
 574
 575 /* wrapper to silence section mismatch warning */
 576 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
 577 {
 578         return _acpi_map_lsapic(handle, pcpu);
 579 }
 580 EXPORT_SYMBOL(acpi_map_lsapic);
 581
 582 int acpi_unmap_lsapic(int cpu)
 583 {
 584         per_cpu(x86_cpu_to_apicid, cpu) = -1;
 585         cpu_clear(cpu, cpu_present_map);
 586         num_processors--;
 587
 588         return (0);
 589 }
 590
 591 EXPORT_SYMBOL(acpi_unmap_lsapic);
 592 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 593
 594 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 595 {
 596         /* TBD */
 597         return -EINVAL;
 598 }
 599
 600 EXPORT_SYMBOL(acpi_register_ioapic);
 601
 602 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 603 {
 604         /* TBD */
 605         return -EINVAL;
 606 }
 607
 608 EXPORT_SYMBOL(acpi_unregister_ioapic);
 609
 610 static int __init acpi_parse_sbf(struct acpi_table_header *table)
 611 {
 612         struct acpi_table_boot *sb;
 613
 614         sb = (struct acpi_table_boot *)table;
 615         if (!sb) {
 616                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
 617                 return -ENODEV;
 618         }
 619
 620         sbf_port = sb->cmos_index;      /* Save CMOS port */
 621
 622         return 0;
 623 }
 624
 625 #ifdef CONFIG_HPET_TIMER
 626 #include <asm/hpet.h>
 627
 628 static struct __initdata resource *hpet_res;
 629
 630 static int __init acpi_parse_hpet(struct acpi_table_header *table)
 631 {
 632         struct acpi_table_hpet *hpet_tbl;
 633
 634         hpet_tbl = (struct acpi_table_hpet *)table;
 635         if (!hpet_tbl) {
 636                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
 637                 return -ENODEV;
 638         }
 639
 640         if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
 641                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 642                        "memory.\n");
 643                 return -1;
 644         }
 645
 646         hpet_address = hpet_tbl->address.address;
 647
 648         /*
 649          * Some broken BIOSes advertise HPET at 0x0. We really do not
 650          * want to allocate a resource there.
 651          */
 652         if (!hpet_address) {
 653                 printk(KERN_WARNING PREFIX
 654                        "HPET id: %#x base: %#lx is invalid\n",
 655                        hpet_tbl->id, hpet_address);
 656                 return 0;
 657         }
 658 #ifdef CONFIG_X86_64
 659         /*
 660          * Some even more broken BIOSes advertise HPET at
 661          * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
 662          * some noise:
 663          */
 664         if (hpet_address == 0xfed0000000000000UL) {
 665                 if (!hpet_force_user) {
 666                         printk(KERN_WARNING PREFIX "HPET id: %#x "
 667                                "base: 0xfed0000000000000 is bogus\n "
 668                                "try hpet=force on the kernel command line to "
 669                                "fix it up to 0xfed00000.\n", hpet_tbl->id);
 670                         hpet_address = 0;
 671                         return 0;
 672                 }
 673                 printk(KERN_WARNING PREFIX
 674                        "HPET id: %#x base: 0xfed0000000000000 fixed up "
 675                        "to 0xfed00000.\n", hpet_tbl->id);
 676                 hpet_address >>= 32;
 677         }
 678 #endif
 679         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 680                hpet_tbl->id, hpet_address);
 681
 682         /*
 683          * Allocate and initialize the HPET firmware resource for adding into
 684          * the resource tree during the lateinit timeframe.
 685          */
 686 #define HPET_RESOURCE_NAME_SIZE 9
 687         hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
 688
 689         if (!hpet_res)
 690                 return 0;
 691
 692         memset(hpet_res, 0, sizeof(*hpet_res));
 693         hpet_res->name = (void *)&hpet_res[1];
 694         hpet_res->flags = IORESOURCE_MEM;
 695         snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
 696                  hpet_tbl->sequence);
 697
 698         hpet_res->start = hpet_address;
 699         hpet_res->end = hpet_address + (1 * 1024) - 1;
 700
 701         return 0;
 702 }
 703
 704 /*
 705  * hpet_insert_resource inserts the HPET resources used into the resource
 706  * tree.
 707  */
 708 static __init int hpet_insert_resource(void)
 709 {
 710         if (!hpet_res)
 711                 return 1;
 712
 713         return insert_resource(&iomem_resource, hpet_res);
 714 }
 715
 716 late_initcall(hpet_insert_resource);
 717
 718 #else
 719 #define acpi_parse_hpet NULL
 720 #endif
 721
 722 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 723 {
 724
 725 #ifdef CONFIG_X86_PM_TIMER
 726         /* detect the location of the ACPI PM Timer */
 727         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
 728                 /* FADT rev. 2 */
 729                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
 730                     ACPI_ADR_SPACE_SYSTEM_IO)
 731                         return 0;
 732
 733                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
 734                 /*
 735                  * "X" fields are optional extensions to the original V1.0
 736                  * fields, so we must selectively expand V1.0 fields if the
 737                  * corresponding X field is zero.
 738                  */
 739                 if (!pmtmr_ioport)
 740                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 741         } else {
 742                 /* FADT rev. 1 */
 743                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 744         }
 745         if (pmtmr_ioport)
 746                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 747                        pmtmr_ioport);
 748 #endif
 749         return 0;
 750 }
 751
 752 #ifdef  CONFIG_X86_LOCAL_APIC
 753 /*
 754  * Parse LAPIC entries in MADT
 755  * returns 0 on success, < 0 on error
 756  */
 757 static int __init acpi_parse_madt_lapic_entries(void)
 758 {
 759         int count;
 760
 761         if (!cpu_has_apic)
 762                 return -ENODEV;
 763
 764         /*
 765          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 766          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 767          */
 768
 769         count =
 770             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
 771                                   acpi_parse_lapic_addr_ovr, 0);
 772         if (count < 0) {
 773                 printk(KERN_ERR PREFIX
 774                        "Error parsing LAPIC address override entry\n");
 775                 return count;
 776         }
 777
 778         mp_register_lapic_address(acpi_lapic_addr);
 779
 780         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
 781                                       acpi_parse_sapic, MAX_APICS);
 782
 783         if (!count)
 784                 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
 785                                               acpi_parse_lapic, MAX_APICS);
 786         if (!count) {
 787                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 788                 /* TBD: Cleanup to allow fallback to MPS */
 789                 return -ENODEV;
 790         } else if (count < 0) {
 791                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 792                 /* TBD: Cleanup to allow fallback to MPS */
 793                 return count;
 794         }
 795
 796         count =
 797             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
 798         if (count < 0) {
 799                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 800                 /* TBD: Cleanup to allow fallback to MPS */
 801                 return count;
 802         }
 803         return 0;
 804 }
 805 #endif                          /* CONFIG_X86_LOCAL_APIC */
 806
 807 #ifdef  CONFIG_X86_IO_APIC
 808 /*
 809  * Parse IOAPIC related entries in MADT
 810  * returns 0 on success, < 0 on error
 811  */
 812 static int __init acpi_parse_madt_ioapic_entries(void)
 813 {
 814         int count;
 815
 816         /*
 817          * ACPI interpreter is required to complete interrupt setup,
 818          * so if it is off, don't enumerate the io-apics with ACPI.
 819          * If MPS is present, it will handle them,
 820          * otherwise the system will stay in PIC mode
 821          */
 822         if (acpi_disabled || acpi_noirq) {
 823                 return -ENODEV;
 824         }
 825
 826         if (!cpu_has_apic)
 827                 return -ENODEV;
 828
 829         /*
 830          * if "noapic" boot option, don't look for IO-APICs
 831          */
 832         if (skip_ioapic_setup) {
 833                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 834                        "due to 'noapic' option.\n");
 835                 return -ENODEV;
 836         }
 837
 838         count =
 839             acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
 840                                   MAX_IO_APICS);
 841         if (!count) {
 842                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 843                 return -ENODEV;
 844         } else if (count < 0) {
 845                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 846                 return count;
 847         }
 848
 849         count =
 850             acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
 851                                   NR_IRQ_VECTORS);
 852         if (count < 0) {
 853                 printk(KERN_ERR PREFIX
 854                        "Error parsing interrupt source overrides entry\n");
 855                 /* TBD: Cleanup to allow fallback to MPS */
 856                 return count;
 857         }
 858
 859         /*
 860          * If BIOS did not supply an INT_SRC_OVR for the SCI
 861          * pretend we got one so we can set the SCI flags.
 862          */
 863         if (!acpi_sci_override_gsi)
 864                 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
 865
 866         /* Fill in identity legacy mapings where no override */
 867         mp_config_acpi_legacy_irqs();
 868
 869         count =
 870             acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
 871                                   NR_IRQ_VECTORS);
 872         if (count < 0) {
 873                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 874                 /* TBD: Cleanup to allow fallback to MPS */
 875                 return count;
 876         }
 877
 878         return 0;
 879 }
 880 #else
 881 static inline int acpi_parse_madt_ioapic_entries(void)
 882 {
 883         return -1;
 884 }
 885 #endif  /* !CONFIG_X86_IO_APIC */
 886
 887 static void __init acpi_process_madt(void)
 888 {
 889 #ifdef CONFIG_X86_LOCAL_APIC
 890         int error;
 891
 892         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 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                                 setup_apic_routing();
 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(const 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(const 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(const 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(const 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 = "HP VISUALIZE NT Workstation",
1012          .matches = {
1013                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1014                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1015                      },
1016          },
1017         {
1018          .callback = force_acpi_ht,
1019          .ident = "Compaq Workstation W8000",
1020          .matches = {
1021                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1022                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1023                      },
1024          },
1025         {
1026          .callback = force_acpi_ht,
1027          .ident = "ASUS P4B266",
1028          .matches = {
1029                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1030                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1031                      },
1032          },
1033         {
1034          .callback = force_acpi_ht,
1035          .ident = "ASUS P2B-DS",
1036          .matches = {
1037                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1038                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1039                      },
1040          },
1041         {
1042          .callback = force_acpi_ht,
1043          .ident = "ASUS CUR-DLS",
1044          .matches = {
1045                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1046                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1047                      },
1048          },
1049         {
1050          .callback = force_acpi_ht,
1051          .ident = "ABIT i440BX-W83977",
1052          .matches = {
1053                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1054                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1055                      },
1056          },
1057         {
1058          .callback = force_acpi_ht,
1059          .ident = "IBM Bladecenter",
1060          .matches = {
1061                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1062                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1063                      },
1064          },
1065         {
1066          .callback = force_acpi_ht,
1067          .ident = "IBM eServer xSeries 360",
1068          .matches = {
1069                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1070                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1071                      },
1072          },
1073         {
1074          .callback = force_acpi_ht,
1075          .ident = "IBM eserver xSeries 330",
1076          .matches = {
1077                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1078                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1079                      },
1080          },
1081         {
1082          .callback = force_acpi_ht,
1083          .ident = "IBM eserver xSeries 440",
1084          .matches = {
1085                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1086                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1087                      },
1088          },
1089
1090         /*
1091          * Boxes that need ACPI PCI IRQ routing disabled
1092          */
1093         {
1094          .callback = disable_acpi_irq,
1095          .ident = "ASUS A7V",
1096          .matches = {
1097                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1098                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1099                      /* newer BIOS, Revision 1011, does work */
1100                      DMI_MATCH(DMI_BIOS_VERSION,
1101                                "ASUS A7V ACPI BIOS Revision 1007"),
1102                      },
1103          },
1104         {
1105                 /*
1106                  * Latest BIOS for IBM 600E (1.16) has bad pcinum
1107                  * for LPC bridge, which is needed for the PCI
1108                  * interrupt links to work. DSDT fix is in bug 5966.
1109                  * 2645, 2646 model numbers are shared with 600/600E/600X
1110                  */
1111          .callback = disable_acpi_irq,
1112          .ident = "IBM Thinkpad 600 Series 2645",
1113          .matches = {
1114                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1115                      DMI_MATCH(DMI_BOARD_NAME, "2645"),
1116                      },
1117          },
1118         {
1119          .callback = disable_acpi_irq,
1120          .ident = "IBM Thinkpad 600 Series 2646",
1121          .matches = {
1122                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1123                      DMI_MATCH(DMI_BOARD_NAME, "2646"),
1124                      },
1125          },
1126         /*
1127          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1128          */
1129         {                       /* _BBN 0 bug */
1130          .callback = disable_acpi_pci,
1131          .ident = "ASUS PR-DLS",
1132          .matches = {
1133                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1134                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1135                      DMI_MATCH(DMI_BIOS_VERSION,
1136                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1137                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1138                      },
1139          },
1140         {
1141          .callback = disable_acpi_pci,
1142          .ident = "Acer TravelMate 36x Laptop",
1143          .matches = {
1144                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1145                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1146                      },
1147          },
1148         {}
1149 };
1150
1151 #endif                          /* __i386__ */
1152
1153 /*
1154  * acpi_boot_table_init() and acpi_boot_init()
1155  *  called from setup_arch(), always.
1156  *      1. checksums all tables
1157  *      2. enumerates lapics
1158  *      3. enumerates io-apics
1159  *
1160  * acpi_table_init() is separate to allow reading SRAT without
1161  * other side effects.
1162  *
1163  * side effects of acpi_boot_init:
1164  *      acpi_lapic = 1 if LAPIC found
1165  *      acpi_ioapic = 1 if IOAPIC found
1166  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1167  *      if acpi_blacklisted() acpi_disabled = 1;
1168  *      acpi_irq_model=...
1169  *      ...
1170  *
1171  * return value: (currently ignored)
1172  *      0: success
1173  *      !0: failure
1174  */
1175
1176 int __init acpi_boot_table_init(void)
1177 {
1178         int error;
1179
1180 #ifdef __i386__
1181         dmi_check_system(acpi_dmi_table);
1182 #endif
1183
1184         /*
1185          * If acpi_disabled, bail out
1186          * One exception: acpi=ht continues far enough to enumerate LAPICs
1187          */
1188         if (acpi_disabled && !acpi_ht)
1189                 return 1;
1190
1191         /*
1192          * Initialize the ACPI boot-time table parser.
1193          */
1194         error = acpi_table_init();
1195         if (error) {
1196                 disable_acpi();
1197                 return error;
1198         }
1199
1200         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1201
1202         /*
1203          * blacklist may disable ACPI entirely
1204          */
1205         error = acpi_blacklisted();
1206         if (error) {
1207                 if (acpi_force) {
1208                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1209                 } else {
1210                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1211                         disable_acpi();
1212                         return error;
1213                 }
1214         }
1215
1216         return 0;
1217 }
1218
1219 int __init acpi_boot_init(void)
1220 {
1221         /*
1222          * If acpi_disabled, bail out
1223          * One exception: acpi=ht continues far enough to enumerate LAPICs
1224          */
1225         if (acpi_disabled && !acpi_ht)
1226                 return 1;
1227
1228         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1229
1230         /*
1231          * set sci_int and PM timer address
1232          */
1233         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1234
1235         /*
1236          * Process the Multiple APIC Description Table (MADT), if present
1237          */
1238         acpi_process_madt();
1239
1240         acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1241
1242         return 0;
1243 }
1244
1245 static int __init parse_acpi(char *arg)
1246 {
1247         if (!arg)
1248                 return -EINVAL;
1249
1250         /* "acpi=off" disables both ACPI table parsing and interpreter */
1251         if (strcmp(arg, "off") == 0) {
1252                 disable_acpi();
1253         }
1254         /* acpi=force to over-ride black-list */
1255         else if (strcmp(arg, "force") == 0) {
1256                 acpi_force = 1;
1257                 acpi_ht = 1;
1258                 acpi_disabled = 0;
1259         }
1260         /* acpi=strict disables out-of-spec workarounds */
1261         else if (strcmp(arg, "strict") == 0) {
1262                 acpi_strict = 1;
1263         }
1264         /* Limit ACPI just to boot-time to enable HT */
1265         else if (strcmp(arg, "ht") == 0) {
1266                 if (!acpi_force)
1267                         disable_acpi();
1268                 acpi_ht = 1;
1269         }
1270         /* "acpi=noirq" disables ACPI interrupt routing */
1271         else if (strcmp(arg, "noirq") == 0) {
1272                 acpi_noirq_set();
1273         } else {
1274                 /* Core will printk when we return error. */
1275                 return -EINVAL;
1276         }
1277         return 0;
1278 }
1279 early_param("acpi", parse_acpi);
1280
1281 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1282 static int __init parse_pci(char *arg)
1283 {
1284         if (arg && strcmp(arg, "noacpi") == 0)
1285                 acpi_disable_pci();
1286         return 0;
1287 }
1288 early_param("pci", parse_pci);
1289
1290 #ifdef CONFIG_X86_IO_APIC
1291 static int __init parse_acpi_skip_timer_override(char *arg)
1292 {
1293         acpi_skip_timer_override = 1;
1294         return 0;
1295 }
1296 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1297
1298 static int __init parse_acpi_use_timer_override(char *arg)
1299 {
1300         acpi_use_timer_override = 1;
1301         return 0;
1302 }
1303 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1304 #endif /* CONFIG_X86_IO_APIC */
1305
1306 static int __init setup_acpi_sci(char *s)
1307 {
1308         if (!s)
1309                 return -EINVAL;
1310         if (!strcmp(s, "edge"))
1311                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1312                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1313         else if (!strcmp(s, "level"))
1314                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1315                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1316         else if (!strcmp(s, "high"))
1317                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1318                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1319         else if (!strcmp(s, "low"))
1320                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1321                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1322         else
1323                 return -EINVAL;
1324         return 0;
1325 }
1326 early_param("acpi_sci", setup_acpi_sci);
1327
1328 int __acpi_acquire_global_lock(unsigned int *lock)
1329 {
1330         unsigned int old, new, val;
1331         do {
1332                 old = *lock;
1333                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1334                 val = cmpxchg(lock, old, new);
1335         } while (unlikely (val != old));
1336         return (new < 3) ? -1 : 0;
1337 }
1338
1339 int __acpi_release_global_lock(unsigned int *lock)
1340 {
1341         unsigned int old, new, val;
1342         do {
1343                 old = *lock;
1344                 new = old & ~0x3;
1345                 val = cmpxchg(lock, old, new);
1346         } while (unlikely (val != old));
1347         return old & 0x1;
1348 }