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   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 static inline int gsi_irq_sharing(int gsi) { return gsi; }
  66
  67 #endif                          /* X86 */
  68
  69 #define BAD_MADT_ENTRY(entry, end) (                                        \
  70                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  71                 ((acpi_table_entry_header *)entry)->length < sizeof(*entry))
  72
  73 #define PREFIX                  "ACPI: "
  74
  75 int acpi_noirq __initdata;      /* skip ACPI IRQ initialization */
  76 int acpi_pci_disabled __initdata;       /* skip ACPI PCI scan and IRQ initialization */
  77 int acpi_ht __initdata = 1;     /* enable HT */
  78
  79 int acpi_lapic;
  80 int acpi_ioapic;
  81 int acpi_strict;
  82 EXPORT_SYMBOL(acpi_strict);
  83
  84 acpi_interrupt_flags acpi_sci_flags __initdata;
  85 int acpi_sci_override_gsi __initdata;
  86 int acpi_skip_timer_override __initdata;
  87
  88 #ifdef CONFIG_X86_LOCAL_APIC
  89 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  90 #endif
  91
  92 #ifndef __HAVE_ARCH_CMPXCHG
  93 #warning ACPI uses CMPXCHG, i486 and later hardware
  94 #endif
  95
  96 #define MAX_MADT_ENTRIES        256
  97 u8 x86_acpiid_to_apicid[MAX_MADT_ENTRIES] =
  98     {[0 ... MAX_MADT_ENTRIES - 1] = 0xff };
  99 EXPORT_SYMBOL(x86_acpiid_to_apicid);
 100
 101 /* --------------------------------------------------------------------------
 102                               Boot-time Configuration
 103    -------------------------------------------------------------------------- */
 104
 105 /*
 106  * The default interrupt routing model is PIC (8259).  This gets
 107  * overriden if IOAPICs are enumerated (below).
 108  */
 109 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
 110
 111 #ifdef  CONFIG_X86_64
 112
 113 /* rely on all ACPI tables being in the direct mapping */
 114 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 115 {
 116         if (!phys_addr || !size)
 117                 return NULL;
 118
 119         if (phys_addr+size <= (end_pfn_map << PAGE_SHIFT) + PAGE_SIZE)
 120                 return __va(phys_addr);
 121
 122         return NULL;
 123 }
 124
 125 #else
 126
 127 /*
 128  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
 129  * to map the target physical address. The problem is that set_fixmap()
 130  * provides a single page, and it is possible that the page is not
 131  * sufficient.
 132  * By using this area, we can map up to MAX_IO_APICS pages temporarily,
 133  * i.e. until the next __va_range() call.
 134  *
 135  * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
 136  * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
 137  * count idx down while incrementing the phys address.
 138  */
 139 char *__acpi_map_table(unsigned long phys, unsigned long size)
 140 {
 141         unsigned long base, offset, mapped_size;
 142         int idx;
 143
 144         if (phys + size < 8 * 1024 * 1024)
 145                 return __va(phys);
 146
 147         offset = phys & (PAGE_SIZE - 1);
 148         mapped_size = PAGE_SIZE - offset;
 149         set_fixmap(FIX_ACPI_END, phys);
 150         base = fix_to_virt(FIX_ACPI_END);
 151
 152         /*
 153          * Most cases can be covered by the below.
 154          */
 155         idx = FIX_ACPI_END;
 156         while (mapped_size < size) {
 157                 if (--idx < FIX_ACPI_BEGIN)
 158                         return NULL;    /* cannot handle this */
 159                 phys += PAGE_SIZE;
 160                 set_fixmap(idx, phys);
 161                 mapped_size += PAGE_SIZE;
 162         }
 163
 164         return ((unsigned char *)base + offset);
 165 }
 166 #endif
 167
 168 #ifdef CONFIG_PCI_MMCONFIG
 169 /* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
 170 struct acpi_table_mcfg_config *pci_mmcfg_config;
 171 int pci_mmcfg_config_num;
 172
 173 int __init acpi_parse_mcfg(unsigned long phys_addr, unsigned long size)
 174 {
 175         struct acpi_table_mcfg *mcfg;
 176         unsigned long i;
 177         int config_size;
 178
 179         if (!phys_addr || !size)
 180                 return -EINVAL;
 181
 182         mcfg = (struct acpi_table_mcfg *)__acpi_map_table(phys_addr, size);
 183         if (!mcfg) {
 184                 printk(KERN_WARNING PREFIX "Unable to map MCFG\n");
 185                 return -ENODEV;
 186         }
 187
 188         /* how many config structures do we have */
 189         pci_mmcfg_config_num = 0;
 190         i = size - sizeof(struct acpi_table_mcfg);
 191         while (i >= sizeof(struct acpi_table_mcfg_config)) {
 192                 ++pci_mmcfg_config_num;
 193                 i -= sizeof(struct acpi_table_mcfg_config);
 194         };
 195         if (pci_mmcfg_config_num == 0) {
 196                 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
 197                 return -ENODEV;
 198         }
 199
 200         config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
 201         pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
 202         if (!pci_mmcfg_config) {
 203                 printk(KERN_WARNING PREFIX
 204                        "No memory for MCFG config tables\n");
 205                 return -ENOMEM;
 206         }
 207
 208         memcpy(pci_mmcfg_config, &mcfg->config, config_size);
 209         for (i = 0; i < pci_mmcfg_config_num; ++i) {
 210                 if (mcfg->config[i].base_reserved) {
 211                         printk(KERN_ERR PREFIX
 212                                "MMCONFIG not in low 4GB of memory\n");
 213                         kfree(pci_mmcfg_config);
 214                         pci_mmcfg_config_num = 0;
 215                         return -ENODEV;
 216                 }
 217         }
 218
 219         return 0;
 220 }
 221 #endif                          /* CONFIG_PCI_MMCONFIG */
 222
 223 #ifdef CONFIG_X86_LOCAL_APIC
 224 static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
 225 {
 226         struct acpi_table_madt *madt = NULL;
 227
 228         if (!phys_addr || !size || !cpu_has_apic)
 229                 return -EINVAL;
 230
 231         madt = (struct acpi_table_madt *)__acpi_map_table(phys_addr, size);
 232         if (!madt) {
 233                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
 234                 return -ENODEV;
 235         }
 236
 237         if (madt->lapic_address) {
 238                 acpi_lapic_addr = (u64) madt->lapic_address;
 239
 240                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
 241                        madt->lapic_address);
 242         }
 243
 244         acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
 245
 246         return 0;
 247 }
 248
 249 static int __init
 250 acpi_parse_lapic(acpi_table_entry_header * header, const unsigned long end)
 251 {
 252         struct acpi_table_lapic *processor = NULL;
 253
 254         processor = (struct acpi_table_lapic *)header;
 255
 256         if (BAD_MADT_ENTRY(processor, end))
 257                 return -EINVAL;
 258
 259         acpi_table_print_madt_entry(header);
 260
 261         /* Record local apic id only when enabled */
 262         if (processor->flags.enabled)
 263                 x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
 264
 265         /*
 266          * We need to register disabled CPU as well to permit
 267          * counting disabled CPUs. This allows us to size
 268          * cpus_possible_map more accurately, to permit
 269          * to not preallocating memory for all NR_CPUS
 270          * when we use CPU hotplug.
 271          */
 272         mp_register_lapic(processor->id,        /* APIC ID */
 273                           processor->flags.enabled);    /* Enabled? */
 274
 275         return 0;
 276 }
 277
 278 static int __init
 279 acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header,
 280                           const unsigned long end)
 281 {
 282         struct acpi_table_lapic_addr_ovr *lapic_addr_ovr = NULL;
 283
 284         lapic_addr_ovr = (struct acpi_table_lapic_addr_ovr *)header;
 285
 286         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
 287                 return -EINVAL;
 288
 289         acpi_lapic_addr = lapic_addr_ovr->address;
 290
 291         return 0;
 292 }
 293
 294 static int __init
 295 acpi_parse_lapic_nmi(acpi_table_entry_header * header, const unsigned long end)
 296 {
 297         struct acpi_table_lapic_nmi *lapic_nmi = NULL;
 298
 299         lapic_nmi = (struct acpi_table_lapic_nmi *)header;
 300
 301         if (BAD_MADT_ENTRY(lapic_nmi, end))
 302                 return -EINVAL;
 303
 304         acpi_table_print_madt_entry(header);
 305
 306         if (lapic_nmi->lint != 1)
 307                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
 308
 309         return 0;
 310 }
 311
 312 #endif                          /*CONFIG_X86_LOCAL_APIC */
 313
 314 #ifdef CONFIG_X86_IO_APIC
 315
 316 static int __init
 317 acpi_parse_ioapic(acpi_table_entry_header * header, const unsigned long end)
 318 {
 319         struct acpi_table_ioapic *ioapic = NULL;
 320
 321         ioapic = (struct acpi_table_ioapic *)header;
 322
 323         if (BAD_MADT_ENTRY(ioapic, end))
 324                 return -EINVAL;
 325
 326         acpi_table_print_madt_entry(header);
 327
 328         mp_register_ioapic(ioapic->id,
 329                            ioapic->address, ioapic->global_irq_base);
 330
 331         return 0;
 332 }
 333
 334 /*
 335  * Parse Interrupt Source Override for the ACPI SCI
 336  */
 337 static void acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
 338 {
 339         if (trigger == 0)       /* compatible SCI trigger is level */
 340                 trigger = 3;
 341
 342         if (polarity == 0)      /* compatible SCI polarity is low */
 343                 polarity = 3;
 344
 345         /* Command-line over-ride via acpi_sci= */
 346         if (acpi_sci_flags.trigger)
 347                 trigger = acpi_sci_flags.trigger;
 348
 349         if (acpi_sci_flags.polarity)
 350                 polarity = acpi_sci_flags.polarity;
 351
 352         /*
 353          * mp_config_acpi_legacy_irqs() already setup IRQs < 16
 354          * If GSI is < 16, this will update its flags,
 355          * else it will create a new mp_irqs[] entry.
 356          */
 357         mp_override_legacy_irq(gsi, polarity, trigger, gsi);
 358
 359         /*
 360          * stash over-ride to indicate we've been here
 361          * and for later update of acpi_fadt
 362          */
 363         acpi_sci_override_gsi = gsi;
 364         return;
 365 }
 366
 367 static int __init
 368 acpi_parse_int_src_ovr(acpi_table_entry_header * header,
 369                        const unsigned long end)
 370 {
 371         struct acpi_table_int_src_ovr *intsrc = NULL;
 372
 373         intsrc = (struct acpi_table_int_src_ovr *)header;
 374
 375         if (BAD_MADT_ENTRY(intsrc, end))
 376                 return -EINVAL;
 377
 378         acpi_table_print_madt_entry(header);
 379
 380         if (intsrc->bus_irq == acpi_fadt.sci_int) {
 381                 acpi_sci_ioapic_setup(intsrc->global_irq,
 382                                       intsrc->flags.polarity,
 383                                       intsrc->flags.trigger);
 384                 return 0;
 385         }
 386
 387         if (acpi_skip_timer_override &&
 388             intsrc->bus_irq == 0 && intsrc->global_irq == 2) {
 389                 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
 390                 return 0;
 391         }
 392
 393         mp_override_legacy_irq(intsrc->bus_irq,
 394                                intsrc->flags.polarity,
 395                                intsrc->flags.trigger, intsrc->global_irq);
 396
 397         return 0;
 398 }
 399
 400 static int __init
 401 acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
 402 {
 403         struct acpi_table_nmi_src *nmi_src = NULL;
 404
 405         nmi_src = (struct acpi_table_nmi_src *)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_irq_sharing(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_table_lapic *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_table_lapic *)obj->buffer.pointer;
 534
 535         if ((lapic->header.type != ACPI_MADT_LAPIC) ||
 536             (!lapic->flags.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->flags.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(unsigned long phys_addr, unsigned long size)
 624 {
 625         struct acpi_table_sbf *sb;
 626
 627         if (!phys_addr || !size)
 628                 return -EINVAL;
 629
 630         sb = (struct acpi_table_sbf *)__acpi_map_table(phys_addr, size);
 631         if (!sb) {
 632                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
 633                 return -ENODEV;
 634         }
 635
 636         sbf_port = sb->sbf_cmos;        /* Save CMOS port */
 637
 638         return 0;
 639 }
 640
 641 #ifdef CONFIG_HPET_TIMER
 642
 643 static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
 644 {
 645         struct acpi_table_hpet *hpet_tbl;
 646         struct resource *hpet_res;
 647         resource_size_t res_start;
 648
 649         if (!phys || !size)
 650                 return -EINVAL;
 651
 652         hpet_tbl = (struct acpi_table_hpet *)__acpi_map_table(phys, size);
 653         if (!hpet_tbl) {
 654                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
 655                 return -ENODEV;
 656         }
 657
 658         if (hpet_tbl->addr.space_id != ACPI_SPACE_MEM) {
 659                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 660                        "memory.\n");
 661                 return -1;
 662         }
 663
 664 #define HPET_RESOURCE_NAME_SIZE 9
 665         hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
 666         if (hpet_res) {
 667                 memset(hpet_res, 0, sizeof(*hpet_res));
 668                 hpet_res->name = (void *)&hpet_res[1];
 669                 hpet_res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 670                 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE,
 671                          "HPET %u", hpet_tbl->number);
 672                 hpet_res->end = (1 * 1024) - 1;
 673         }
 674
 675 #ifdef  CONFIG_X86_64
 676         vxtime.hpet_address = hpet_tbl->addr.addrl |
 677             ((long)hpet_tbl->addr.addrh << 32);
 678
 679         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 680                hpet_tbl->id, vxtime.hpet_address);
 681
 682         res_start = vxtime.hpet_address;
 683 #else                           /* X86 */
 684         {
 685                 extern unsigned long hpet_address;
 686
 687                 hpet_address = hpet_tbl->addr.addrl;
 688                 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 689                        hpet_tbl->id, hpet_address);
 690
 691                 res_start = hpet_address;
 692         }
 693 #endif                          /* X86 */
 694
 695         if (hpet_res) {
 696                 hpet_res->start = res_start;
 697                 hpet_res->end += res_start;
 698                 insert_resource(&iomem_resource, hpet_res);
 699         }
 700
 701         return 0;
 702 }
 703 #else
 704 #define acpi_parse_hpet NULL
 705 #endif
 706
 707 #ifdef CONFIG_X86_PM_TIMER
 708 extern u32 pmtmr_ioport;
 709 #endif
 710
 711 static int __init acpi_parse_fadt(unsigned long phys, unsigned long size)
 712 {
 713         struct fadt_descriptor *fadt = NULL;
 714
 715         fadt = (struct fadt_descriptor *)__acpi_map_table(phys, size);
 716         if (!fadt) {
 717                 printk(KERN_WARNING PREFIX "Unable to map FADT\n");
 718                 return 0;
 719         }
 720         /* initialize sci_int early for INT_SRC_OVR MADT parsing */
 721         acpi_fadt.sci_int = fadt->sci_int;
 722
 723         /* initialize rev and apic_phys_dest_mode for x86_64 genapic */
 724         acpi_fadt.revision = fadt->revision;
 725         acpi_fadt.force_apic_physical_destination_mode =
 726             fadt->force_apic_physical_destination_mode;
 727
 728 #ifdef CONFIG_X86_PM_TIMER
 729         /* detect the location of the ACPI PM Timer */
 730         if (fadt->revision >= FADT2_REVISION_ID) {
 731                 /* FADT rev. 2 */
 732                 if (fadt->xpm_tmr_blk.address_space_id !=
 733                     ACPI_ADR_SPACE_SYSTEM_IO)
 734                         return 0;
 735
 736                 pmtmr_ioport = fadt->xpm_tmr_blk.address;
 737                 /*
 738                  * "X" fields are optional extensions to the original V1.0
 739                  * fields, so we must selectively expand V1.0 fields if the
 740                  * corresponding X field is zero.
 741                  */
 742                 if (!pmtmr_ioport)
 743                         pmtmr_ioport = fadt->V1_pm_tmr_blk;
 744         } else {
 745                 /* FADT rev. 1 */
 746                 pmtmr_ioport = fadt->V1_pm_tmr_blk;
 747         }
 748         if (pmtmr_ioport)
 749                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 750                        pmtmr_ioport);
 751 #endif
 752         return 0;
 753 }
 754
 755 unsigned long __init acpi_find_rsdp(void)
 756 {
 757         unsigned long rsdp_phys = 0;
 758
 759         if (efi_enabled) {
 760                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 761                         return efi.acpi20;
 762                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 763                         return efi.acpi;
 764         }
 765         /*
 766          * Scan memory looking for the RSDP signature. First search EBDA (low
 767          * memory) paragraphs and then search upper memory (E0000-FFFFF).
 768          */
 769         rsdp_phys = acpi_scan_rsdp(0, 0x400);
 770         if (!rsdp_phys)
 771                 rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);
 772
 773         return rsdp_phys;
 774 }
 775
 776 #ifdef  CONFIG_X86_LOCAL_APIC
 777 /*
 778  * Parse LAPIC entries in MADT
 779  * returns 0 on success, < 0 on error
 780  */
 781 static int __init acpi_parse_madt_lapic_entries(void)
 782 {
 783         int count;
 784
 785         if (!cpu_has_apic)
 786                 return -ENODEV;
 787
 788         /*
 789          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 790          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 791          */
 792
 793         count =
 794             acpi_table_parse_madt(ACPI_MADT_LAPIC_ADDR_OVR,
 795                                   acpi_parse_lapic_addr_ovr, 0);
 796         if (count < 0) {
 797                 printk(KERN_ERR PREFIX
 798                        "Error parsing LAPIC address override entry\n");
 799                 return count;
 800         }
 801
 802         mp_register_lapic_address(acpi_lapic_addr);
 803
 804         count = acpi_table_parse_madt(ACPI_MADT_LAPIC, acpi_parse_lapic,
 805                                       MAX_APICS);
 806         if (!count) {
 807                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 808                 /* TBD: Cleanup to allow fallback to MPS */
 809                 return -ENODEV;
 810         } else if (count < 0) {
 811                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 812                 /* TBD: Cleanup to allow fallback to MPS */
 813                 return count;
 814         }
 815
 816         count =
 817             acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0);
 818         if (count < 0) {
 819                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 820                 /* TBD: Cleanup to allow fallback to MPS */
 821                 return count;
 822         }
 823         return 0;
 824 }
 825 #endif                          /* CONFIG_X86_LOCAL_APIC */
 826
 827 #ifdef  CONFIG_X86_IO_APIC
 828 /*
 829  * Parse IOAPIC related entries in MADT
 830  * returns 0 on success, < 0 on error
 831  */
 832 static int __init acpi_parse_madt_ioapic_entries(void)
 833 {
 834         int count;
 835
 836         /*
 837          * ACPI interpreter is required to complete interrupt setup,
 838          * so if it is off, don't enumerate the io-apics with ACPI.
 839          * If MPS is present, it will handle them,
 840          * otherwise the system will stay in PIC mode
 841          */
 842         if (acpi_disabled || acpi_noirq) {
 843                 return -ENODEV;
 844         }
 845
 846         if (!cpu_has_apic)
 847                 return -ENODEV;
 848
 849         /*
 850          * if "noapic" boot option, don't look for IO-APICs
 851          */
 852         if (skip_ioapic_setup) {
 853                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 854                        "due to 'noapic' option.\n");
 855                 return -ENODEV;
 856         }
 857
 858         count =
 859             acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic,
 860                                   MAX_IO_APICS);
 861         if (!count) {
 862                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 863                 return -ENODEV;
 864         } else if (count < 0) {
 865                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 866                 return count;
 867         }
 868
 869         count =
 870             acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr,
 871                                   NR_IRQ_VECTORS);
 872         if (count < 0) {
 873                 printk(KERN_ERR PREFIX
 874                        "Error parsing interrupt source overrides entry\n");
 875                 /* TBD: Cleanup to allow fallback to MPS */
 876                 return count;
 877         }
 878
 879         /*
 880          * If BIOS did not supply an INT_SRC_OVR for the SCI
 881          * pretend we got one so we can set the SCI flags.
 882          */
 883         if (!acpi_sci_override_gsi)
 884                 acpi_sci_ioapic_setup(acpi_fadt.sci_int, 0, 0);
 885
 886         /* Fill in identity legacy mapings where no override */
 887         mp_config_acpi_legacy_irqs();
 888
 889         count =
 890             acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src,
 891                                   NR_IRQ_VECTORS);
 892         if (count < 0) {
 893                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 894                 /* TBD: Cleanup to allow fallback to MPS */
 895                 return count;
 896         }
 897
 898         return 0;
 899 }
 900 #else
 901 static inline int acpi_parse_madt_ioapic_entries(void)
 902 {
 903         return -1;
 904 }
 905 #endif  /* !CONFIG_X86_IO_APIC */
 906
 907 static void __init acpi_process_madt(void)
 908 {
 909 #ifdef CONFIG_X86_LOCAL_APIC
 910         int count, error;
 911
 912         count = acpi_table_parse(ACPI_APIC, acpi_parse_madt);
 913         if (count >= 1) {
 914
 915                 /*
 916                  * Parse MADT LAPIC entries
 917                  */
 918                 error = acpi_parse_madt_lapic_entries();
 919                 if (!error) {
 920                         acpi_lapic = 1;
 921
 922 #ifdef CONFIG_X86_GENERICARCH
 923                         generic_bigsmp_probe();
 924 #endif
 925                         /*
 926                          * Parse MADT IO-APIC entries
 927                          */
 928                         error = acpi_parse_madt_ioapic_entries();
 929                         if (!error) {
 930                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 931                                 acpi_irq_balance_set(NULL);
 932                                 acpi_ioapic = 1;
 933
 934                                 smp_found_config = 1;
 935                                 clustered_apic_check();
 936                         }
 937                 }
 938                 if (error == -EINVAL) {
 939                         /*
 940                          * Dell Precision Workstation 410, 610 come here.
 941                          */
 942                         printk(KERN_ERR PREFIX
 943                                "Invalid BIOS MADT, disabling ACPI\n");
 944                         disable_acpi();
 945                 }
 946         }
 947 #endif
 948         return;
 949 }
 950
 951 #ifdef __i386__
 952
 953 static int __init disable_acpi_irq(struct dmi_system_id *d)
 954 {
 955         if (!acpi_force) {
 956                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
 957                        d->ident);
 958                 acpi_noirq_set();
 959         }
 960         return 0;
 961 }
 962
 963 static int __init disable_acpi_pci(struct dmi_system_id *d)
 964 {
 965         if (!acpi_force) {
 966                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
 967                        d->ident);
 968                 acpi_disable_pci();
 969         }
 970         return 0;
 971 }
 972
 973 static int __init dmi_disable_acpi(struct dmi_system_id *d)
 974 {
 975         if (!acpi_force) {
 976                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
 977                 disable_acpi();
 978         } else {
 979                 printk(KERN_NOTICE
 980                        "Warning: DMI blacklist says broken, but acpi forced\n");
 981         }
 982         return 0;
 983 }
 984
 985 /*
 986  * Limit ACPI to CPU enumeration for HT
 987  */
 988 static int __init force_acpi_ht(struct dmi_system_id *d)
 989 {
 990         if (!acpi_force) {
 991                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
 992                        d->ident);
 993                 disable_acpi();
 994                 acpi_ht = 1;
 995         } else {
 996                 printk(KERN_NOTICE
 997                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
 998         }
 999         return 0;
1000 }
1001
1002 /*
1003  * If your system is blacklisted here, but you find that acpi=force
1004  * works for you, please contact acpi-devel@sourceforge.net
1005  */
1006 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1007         /*
1008          * Boxes that need ACPI disabled
1009          */
1010         {
1011          .callback = dmi_disable_acpi,
1012          .ident = "IBM Thinkpad",
1013          .matches = {
1014                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1015                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1016                      },
1017          },
1018
1019         /*
1020          * Boxes that need acpi=ht
1021          */
1022         {
1023          .callback = force_acpi_ht,
1024          .ident = "FSC Primergy T850",
1025          .matches = {
1026                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1027                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
1028                      },
1029          },
1030         {
1031          .callback = force_acpi_ht,
1032          .ident = "DELL GX240",
1033          .matches = {
1034                      DMI_MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
1035                      DMI_MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
1036                      },
1037          },
1038         {
1039          .callback = force_acpi_ht,
1040          .ident = "HP VISUALIZE NT Workstation",
1041          .matches = {
1042                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1043                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1044                      },
1045          },
1046         {
1047          .callback = force_acpi_ht,
1048          .ident = "Compaq Workstation W8000",
1049          .matches = {
1050                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1051                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1052                      },
1053          },
1054         {
1055          .callback = force_acpi_ht,
1056          .ident = "ASUS P4B266",
1057          .matches = {
1058                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1059                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1060                      },
1061          },
1062         {
1063          .callback = force_acpi_ht,
1064          .ident = "ASUS P2B-DS",
1065          .matches = {
1066                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1067                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1068                      },
1069          },
1070         {
1071          .callback = force_acpi_ht,
1072          .ident = "ASUS CUR-DLS",
1073          .matches = {
1074                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1075                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1076                      },
1077          },
1078         {
1079          .callback = force_acpi_ht,
1080          .ident = "ABIT i440BX-W83977",
1081          .matches = {
1082                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1083                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1084                      },
1085          },
1086         {
1087          .callback = force_acpi_ht,
1088          .ident = "IBM Bladecenter",
1089          .matches = {
1090                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1091                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1092                      },
1093          },
1094         {
1095          .callback = force_acpi_ht,
1096          .ident = "IBM eServer xSeries 360",
1097          .matches = {
1098                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1099                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1100                      },
1101          },
1102         {
1103          .callback = force_acpi_ht,
1104          .ident = "IBM eserver xSeries 330",
1105          .matches = {
1106                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1107                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1108                      },
1109          },
1110         {
1111          .callback = force_acpi_ht,
1112          .ident = "IBM eserver xSeries 440",
1113          .matches = {
1114                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1115                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1116                      },
1117          },
1118
1119         /*
1120          * Boxes that need ACPI PCI IRQ routing disabled
1121          */
1122         {
1123          .callback = disable_acpi_irq,
1124          .ident = "ASUS A7V",
1125          .matches = {
1126                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1127                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1128                      /* newer BIOS, Revision 1011, does work */
1129                      DMI_MATCH(DMI_BIOS_VERSION,
1130                                "ASUS A7V ACPI BIOS Revision 1007"),
1131                      },
1132          },
1133
1134         /*
1135          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1136          */
1137         {                       /* _BBN 0 bug */
1138          .callback = disable_acpi_pci,
1139          .ident = "ASUS PR-DLS",
1140          .matches = {
1141                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1142                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1143                      DMI_MATCH(DMI_BIOS_VERSION,
1144                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1145                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1146                      },
1147          },
1148         {
1149          .callback = disable_acpi_pci,
1150          .ident = "Acer TravelMate 36x Laptop",
1151          .matches = {
1152                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1153                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1154                      },
1155          },
1156         {}
1157 };
1158
1159 #endif                          /* __i386__ */
1160
1161 /*
1162  * acpi_boot_table_init() and acpi_boot_init()
1163  *  called from setup_arch(), always.
1164  *      1. checksums all tables
1165  *      2. enumerates lapics
1166  *      3. enumerates io-apics
1167  *
1168  * acpi_table_init() is separate to allow reading SRAT without
1169  * other side effects.
1170  *
1171  * side effects of acpi_boot_init:
1172  *      acpi_lapic = 1 if LAPIC found
1173  *      acpi_ioapic = 1 if IOAPIC found
1174  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1175  *      if acpi_blacklisted() acpi_disabled = 1;
1176  *      acpi_irq_model=...
1177  *      ...
1178  *
1179  * return value: (currently ignored)
1180  *      0: success
1181  *      !0: failure
1182  */
1183
1184 int __init acpi_boot_table_init(void)
1185 {
1186         int error;
1187
1188 #ifdef __i386__
1189         dmi_check_system(acpi_dmi_table);
1190 #endif
1191
1192         /*
1193          * If acpi_disabled, bail out
1194          * One exception: acpi=ht continues far enough to enumerate LAPICs
1195          */
1196         if (acpi_disabled && !acpi_ht)
1197                 return 1;
1198
1199         /*
1200          * Initialize the ACPI boot-time table parser.
1201          */
1202         error = acpi_table_init();
1203         if (error) {
1204                 disable_acpi();
1205                 return error;
1206         }
1207
1208         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1209
1210         /*
1211          * blacklist may disable ACPI entirely
1212          */
1213         error = acpi_blacklisted();
1214         if (error) {
1215                 if (acpi_force) {
1216                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1217                 } else {
1218                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1219                         disable_acpi();
1220                         return error;
1221                 }
1222         }
1223
1224         return 0;
1225 }
1226
1227 int __init acpi_boot_init(void)
1228 {
1229         /*
1230          * If acpi_disabled, bail out
1231          * One exception: acpi=ht continues far enough to enumerate LAPICs
1232          */
1233         if (acpi_disabled && !acpi_ht)
1234                 return 1;
1235
1236         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1237
1238         /*
1239          * set sci_int and PM timer address
1240          */
1241         acpi_table_parse(ACPI_FADT, acpi_parse_fadt);
1242
1243         /*
1244          * Process the Multiple APIC Description Table (MADT), if present
1245          */
1246         acpi_process_madt();
1247
1248         acpi_table_parse(ACPI_HPET, acpi_parse_hpet);
1249
1250         return 0;
1251 }
1252
1253 static int __init parse_acpi(char *arg)
1254 {
1255         if (!arg)
1256                 return -EINVAL;
1257
1258         /* "acpi=off" disables both ACPI table parsing and interpreter */
1259         if (strcmp(arg, "off") == 0) {
1260                 disable_acpi();
1261         }
1262         /* acpi=force to over-ride black-list */
1263         else if (strcmp(arg, "force") == 0) {
1264                 acpi_force = 1;
1265                 acpi_ht = 1;
1266                 acpi_disabled = 0;
1267         }
1268         /* acpi=strict disables out-of-spec workarounds */
1269         else if (strcmp(arg, "strict") == 0) {
1270                 acpi_strict = 1;
1271         }
1272         /* Limit ACPI just to boot-time to enable HT */
1273         else if (strcmp(arg, "ht") == 0) {
1274                 if (!acpi_force)
1275                         disable_acpi();
1276                 acpi_ht = 1;
1277         }
1278         /* "acpi=noirq" disables ACPI interrupt routing */
1279         else if (strcmp(arg, "noirq") == 0) {
1280                 acpi_noirq_set();
1281         } else {
1282                 /* Core will printk when we return error. */
1283                 return -EINVAL;
1284         }
1285         return 0;
1286 }
1287 early_param("acpi", parse_acpi);
1288
1289 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1290 static int __init parse_pci(char *arg)
1291 {
1292         if (arg && strcmp(arg, "noacpi") == 0)
1293                 acpi_disable_pci();
1294         return 0;
1295 }
1296 early_param("pci", parse_pci);
1297
1298 #ifdef CONFIG_X86_IO_APIC
1299 static int __init parse_acpi_skip_timer_override(char *arg)
1300 {
1301         acpi_skip_timer_override = 1;
1302         return 0;
1303 }
1304 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1305 #endif /* CONFIG_X86_IO_APIC */
1306
1307 static int __init setup_acpi_sci(char *s)
1308 {
1309         if (!s)
1310                 return -EINVAL;
1311         if (!strcmp(s, "edge"))
1312                 acpi_sci_flags.trigger = 1;
1313         else if (!strcmp(s, "level"))
1314                 acpi_sci_flags.trigger = 3;
1315         else if (!strcmp(s, "high"))
1316                 acpi_sci_flags.polarity = 1;
1317         else if (!strcmp(s, "low"))
1318                 acpi_sci_flags.polarity = 3;
1319         else
1320                 return -EINVAL;
1321         return 0;
1322 }
1323 early_param("acpi_sci", setup_acpi_sci);