arch/i386/kernel/acpi/boot.c

   1 /*
   2  *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/init.h>
  27 #include <linux/acpi.h>
  28 #include <linux/efi.h>
  29 #include <linux/cpumask.h>
  30 #include <linux/module.h>
  31 #include <linux/dmi.h>
  32 #include <linux/irq.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/ioport.h>
  35
  36 #include <asm/pgtable.h>
  37 #include <asm/io_apic.h>
  38 #include <asm/apic.h>
  39 #include <asm/io.h>
  40 #include <asm/mpspec.h>
  41
  42 static int __initdata acpi_force = 0;
  43
  44 #ifdef  CONFIG_ACPI
  45 int acpi_disabled = 0;
  46 #else
  47 int acpi_disabled = 1;
  48 #endif
  49 EXPORT_SYMBOL(acpi_disabled);
  50
  51 #ifdef  CONFIG_X86_64
  52
  53 #include <asm/proto.h>
  54
  55 static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return 0; }
  56
  57
  58 #else                           /* X86 */
  59
  60 #ifdef  CONFIG_X86_LOCAL_APIC
  61 #include <mach_apic.h>
  62 #include <mach_mpparse.h>
  63 #endif                          /* CONFIG_X86_LOCAL_APIC */
  64
  65 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 #ifdef CONFIG_X86_IO_APIC
 472         if (use_pci_vector() && !platform_legacy_irq(gsi))
 473                 *irq = IO_APIC_VECTOR(gsi);
 474         else
 475 #endif
 476                 *irq = gsi_irq_sharing(gsi);
 477         return 0;
 478 }
 479
 480 /*
 481  * success: return IRQ number (>=0)
 482  * failure: return < 0
 483  */
 484 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 485 {
 486         unsigned int irq;
 487         unsigned int plat_gsi = gsi;
 488
 489 #ifdef CONFIG_PCI
 490         /*
 491          * Make sure all (legacy) PCI IRQs are set as level-triggered.
 492          */
 493         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
 494                 extern void eisa_set_level_irq(unsigned int irq);
 495
 496                 if (triggering == ACPI_LEVEL_SENSITIVE)
 497                         eisa_set_level_irq(gsi);
 498         }
 499 #endif
 500
 501 #ifdef CONFIG_X86_IO_APIC
 502         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
 503                 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
 504         }
 505 #endif
 506         acpi_gsi_to_irq(plat_gsi, &irq);
 507         return irq;
 508 }
 509
 510 EXPORT_SYMBOL(acpi_register_gsi);
 511
 512 /*
 513  *  ACPI based hotplug support for CPU
 514  */
 515 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 516 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 517 {
 518         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 519         union acpi_object *obj;
 520         struct acpi_table_lapic *lapic;
 521         cpumask_t tmp_map, new_map;
 522         u8 physid;
 523         int cpu;
 524
 525         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 526                 return -EINVAL;
 527
 528         if (!buffer.length || !buffer.pointer)
 529                 return -EINVAL;
 530
 531         obj = buffer.pointer;
 532         if (obj->type != ACPI_TYPE_BUFFER ||
 533             obj->buffer.length < sizeof(*lapic)) {
 534                 kfree(buffer.pointer);
 535                 return -EINVAL;
 536         }
 537
 538         lapic = (struct acpi_table_lapic *)obj->buffer.pointer;
 539
 540         if ((lapic->header.type != ACPI_MADT_LAPIC) ||
 541             (!lapic->flags.enabled)) {
 542                 kfree(buffer.pointer);
 543                 return -EINVAL;
 544         }
 545
 546         physid = lapic->id;
 547
 548         kfree(buffer.pointer);
 549         buffer.length = ACPI_ALLOCATE_BUFFER;
 550         buffer.pointer = NULL;
 551
 552         tmp_map = cpu_present_map;
 553         mp_register_lapic(physid, lapic->flags.enabled);
 554
 555         /*
 556          * If mp_register_lapic successfully generates a new logical cpu
 557          * number, then the following will get us exactly what was mapped
 558          */
 559         cpus_andnot(new_map, cpu_present_map, tmp_map);
 560         if (cpus_empty(new_map)) {
 561                 printk ("Unable to map lapic to logical cpu number\n");
 562                 return -EINVAL;
 563         }
 564
 565         cpu = first_cpu(new_map);
 566
 567         *pcpu = cpu;
 568         return 0;
 569 }
 570
 571 EXPORT_SYMBOL(acpi_map_lsapic);
 572
 573 int acpi_unmap_lsapic(int cpu)
 574 {
 575         int i;
 576
 577         for_each_possible_cpu(i) {
 578                 if (x86_acpiid_to_apicid[i] == x86_cpu_to_apicid[cpu]) {
 579                         x86_acpiid_to_apicid[i] = -1;
 580                         break;
 581                 }
 582         }
 583         x86_cpu_to_apicid[cpu] = -1;
 584         cpu_clear(cpu, cpu_present_map);
 585         num_processors--;
 586
 587         return (0);
 588 }
 589
 590 EXPORT_SYMBOL(acpi_unmap_lsapic);
 591 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 592
 593 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 594 {
 595         /* TBD */
 596         return -EINVAL;
 597 }
 598
 599 EXPORT_SYMBOL(acpi_register_ioapic);
 600
 601 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 602 {
 603         /* TBD */
 604         return -EINVAL;
 605 }
 606
 607 EXPORT_SYMBOL(acpi_unregister_ioapic);
 608
 609 static unsigned long __init
 610 acpi_scan_rsdp(unsigned long start, unsigned long length)
 611 {
 612         unsigned long offset = 0;
 613         unsigned long sig_len = sizeof("RSD PTR ") - 1;
 614
 615         /*
 616          * Scan all 16-byte boundaries of the physical memory region for the
 617          * RSDP signature.
 618          */
 619         for (offset = 0; offset < length; offset += 16) {
 620                 if (strncmp((char *)(phys_to_virt(start) + offset), "RSD PTR ", sig_len))
 621                         continue;
 622                 return (start + offset);
 623         }
 624
 625         return 0;
 626 }
 627
 628 static int __init acpi_parse_sbf(unsigned long phys_addr, unsigned long size)
 629 {
 630         struct acpi_table_sbf *sb;
 631
 632         if (!phys_addr || !size)
 633                 return -EINVAL;
 634
 635         sb = (struct acpi_table_sbf *)__acpi_map_table(phys_addr, size);
 636         if (!sb) {
 637                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
 638                 return -ENODEV;
 639         }
 640
 641         sbf_port = sb->sbf_cmos;        /* Save CMOS port */
 642
 643         return 0;
 644 }
 645
 646 #ifdef CONFIG_HPET_TIMER
 647
 648 static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
 649 {
 650         struct acpi_table_hpet *hpet_tbl;
 651         struct resource *hpet_res;
 652         resource_size_t res_start;
 653
 654         if (!phys || !size)
 655                 return -EINVAL;
 656
 657         hpet_tbl = (struct acpi_table_hpet *)__acpi_map_table(phys, size);
 658         if (!hpet_tbl) {
 659                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
 660                 return -ENODEV;
 661         }
 662
 663         if (hpet_tbl->addr.space_id != ACPI_SPACE_MEM) {
 664                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 665                        "memory.\n");
 666                 return -1;
 667         }
 668
 669 #define HPET_RESOURCE_NAME_SIZE 9
 670         hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
 671         if (hpet_res) {
 672                 memset(hpet_res, 0, sizeof(*hpet_res));
 673                 hpet_res->name = (void *)&hpet_res[1];
 674                 hpet_res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 675                 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE,
 676                          "HPET %u", hpet_tbl->number);
 677                 hpet_res->end = (1 * 1024) - 1;
 678         }
 679
 680 #ifdef  CONFIG_X86_64
 681         vxtime.hpet_address = hpet_tbl->addr.addrl |
 682             ((long)hpet_tbl->addr.addrh << 32);
 683
 684         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 685                hpet_tbl->id, vxtime.hpet_address);
 686
 687         res_start = vxtime.hpet_address;
 688 #else                           /* X86 */
 689         {
 690                 extern unsigned long hpet_address;
 691
 692                 hpet_address = hpet_tbl->addr.addrl;
 693                 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 694                        hpet_tbl->id, hpet_address);
 695
 696                 res_start = hpet_address;
 697         }
 698 #endif                          /* X86 */
 699
 700         if (hpet_res) {
 701                 hpet_res->start = res_start;
 702                 hpet_res->end += res_start;
 703                 insert_resource(&iomem_resource, hpet_res);
 704         }
 705
 706         return 0;
 707 }
 708 #else
 709 #define acpi_parse_hpet NULL
 710 #endif
 711
 712 #ifdef CONFIG_X86_PM_TIMER
 713 extern u32 pmtmr_ioport;
 714 #endif
 715
 716 static int __init acpi_parse_fadt(unsigned long phys, unsigned long size)
 717 {
 718         struct fadt_descriptor *fadt = NULL;
 719
 720         fadt = (struct fadt_descriptor *)__acpi_map_table(phys, size);
 721         if (!fadt) {
 722                 printk(KERN_WARNING PREFIX "Unable to map FADT\n");
 723                 return 0;
 724         }
 725         /* initialize sci_int early for INT_SRC_OVR MADT parsing */
 726         acpi_fadt.sci_int = fadt->sci_int;
 727
 728         /* initialize rev and apic_phys_dest_mode for x86_64 genapic */
 729         acpi_fadt.revision = fadt->revision;
 730         acpi_fadt.force_apic_physical_destination_mode =
 731             fadt->force_apic_physical_destination_mode;
 732
 733 #ifdef CONFIG_X86_PM_TIMER
 734         /* detect the location of the ACPI PM Timer */
 735         if (fadt->revision >= FADT2_REVISION_ID) {
 736                 /* FADT rev. 2 */
 737                 if (fadt->xpm_tmr_blk.address_space_id !=
 738                     ACPI_ADR_SPACE_SYSTEM_IO)
 739                         return 0;
 740
 741                 pmtmr_ioport = fadt->xpm_tmr_blk.address;
 742                 /*
 743                  * "X" fields are optional extensions to the original V1.0
 744                  * fields, so we must selectively expand V1.0 fields if the
 745                  * corresponding X field is zero.
 746                  */
 747                 if (!pmtmr_ioport)
 748                         pmtmr_ioport = fadt->V1_pm_tmr_blk;
 749         } else {
 750                 /* FADT rev. 1 */
 751                 pmtmr_ioport = fadt->V1_pm_tmr_blk;
 752         }
 753         if (pmtmr_ioport)
 754                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 755                        pmtmr_ioport);
 756 #endif
 757         return 0;
 758 }
 759
 760 unsigned long __init acpi_find_rsdp(void)
 761 {
 762         unsigned long rsdp_phys = 0;
 763
 764         if (efi_enabled) {
 765                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 766                         return efi.acpi20;
 767                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 768                         return efi.acpi;
 769         }
 770         /*
 771          * Scan memory looking for the RSDP signature. First search EBDA (low
 772          * memory) paragraphs and then search upper memory (E0000-FFFFF).
 773          */
 774         rsdp_phys = acpi_scan_rsdp(0, 0x400);
 775         if (!rsdp_phys)
 776                 rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);
 777
 778         return rsdp_phys;
 779 }
 780
 781 #ifdef  CONFIG_X86_LOCAL_APIC
 782 /*
 783  * Parse LAPIC entries in MADT
 784  * returns 0 on success, < 0 on error
 785  */
 786 static int __init acpi_parse_madt_lapic_entries(void)
 787 {
 788         int count;
 789
 790         if (!cpu_has_apic)
 791                 return -ENODEV;
 792
 793         /*
 794          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 795          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 796          */
 797
 798         count =
 799             acpi_table_parse_madt(ACPI_MADT_LAPIC_ADDR_OVR,
 800                                   acpi_parse_lapic_addr_ovr, 0);
 801         if (count < 0) {
 802                 printk(KERN_ERR PREFIX
 803                        "Error parsing LAPIC address override entry\n");
 804                 return count;
 805         }
 806
 807         mp_register_lapic_address(acpi_lapic_addr);
 808
 809         count = acpi_table_parse_madt(ACPI_MADT_LAPIC, acpi_parse_lapic,
 810                                       MAX_APICS);
 811         if (!count) {
 812                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 813                 /* TBD: Cleanup to allow fallback to MPS */
 814                 return -ENODEV;
 815         } else if (count < 0) {
 816                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 817                 /* TBD: Cleanup to allow fallback to MPS */
 818                 return count;
 819         }
 820
 821         count =
 822             acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0);
 823         if (count < 0) {
 824                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 825                 /* TBD: Cleanup to allow fallback to MPS */
 826                 return count;
 827         }
 828         return 0;
 829 }
 830 #endif                          /* CONFIG_X86_LOCAL_APIC */
 831
 832 #ifdef  CONFIG_X86_IO_APIC
 833 /*
 834  * Parse IOAPIC related entries in MADT
 835  * returns 0 on success, < 0 on error
 836  */
 837 static int __init acpi_parse_madt_ioapic_entries(void)
 838 {
 839         int count;
 840
 841         /*
 842          * ACPI interpreter is required to complete interrupt setup,
 843          * so if it is off, don't enumerate the io-apics with ACPI.
 844          * If MPS is present, it will handle them,
 845          * otherwise the system will stay in PIC mode
 846          */
 847         if (acpi_disabled || acpi_noirq) {
 848                 return -ENODEV;
 849         }
 850
 851         if (!cpu_has_apic)
 852                 return -ENODEV;
 853
 854         /*
 855          * if "noapic" boot option, don't look for IO-APICs
 856          */
 857         if (skip_ioapic_setup) {
 858                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 859                        "due to 'noapic' option.\n");
 860                 return -ENODEV;
 861         }
 862
 863         count =
 864             acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic,
 865                                   MAX_IO_APICS);
 866         if (!count) {
 867                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 868                 return -ENODEV;
 869         } else if (count < 0) {
 870                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 871                 return count;
 872         }
 873
 874         count =
 875             acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr,
 876                                   NR_IRQ_VECTORS);
 877         if (count < 0) {
 878                 printk(KERN_ERR PREFIX
 879                        "Error parsing interrupt source overrides entry\n");
 880                 /* TBD: Cleanup to allow fallback to MPS */
 881                 return count;
 882         }
 883
 884         /*
 885          * If BIOS did not supply an INT_SRC_OVR for the SCI
 886          * pretend we got one so we can set the SCI flags.
 887          */
 888         if (!acpi_sci_override_gsi)
 889                 acpi_sci_ioapic_setup(acpi_fadt.sci_int, 0, 0);
 890
 891         /* Fill in identity legacy mapings where no override */
 892         mp_config_acpi_legacy_irqs();
 893
 894         count =
 895             acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src,
 896                                   NR_IRQ_VECTORS);
 897         if (count < 0) {
 898                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 899                 /* TBD: Cleanup to allow fallback to MPS */
 900                 return count;
 901         }
 902
 903         return 0;
 904 }
 905 #else
 906 static inline int acpi_parse_madt_ioapic_entries(void)
 907 {
 908         return -1;
 909 }
 910 #endif  /* !CONFIG_X86_IO_APIC */
 911
 912 static void __init acpi_process_madt(void)
 913 {
 914 #ifdef CONFIG_X86_LOCAL_APIC
 915         int count, error;
 916
 917         count = acpi_table_parse(ACPI_APIC, acpi_parse_madt);
 918         if (count >= 1) {
 919
 920                 /*
 921                  * Parse MADT LAPIC entries
 922                  */
 923                 error = acpi_parse_madt_lapic_entries();
 924                 if (!error) {
 925                         acpi_lapic = 1;
 926
 927 #ifdef CONFIG_X86_GENERICARCH
 928                         generic_bigsmp_probe();
 929 #endif
 930                         /*
 931                          * Parse MADT IO-APIC entries
 932                          */
 933                         error = acpi_parse_madt_ioapic_entries();
 934                         if (!error) {
 935                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 936                                 acpi_irq_balance_set(NULL);
 937                                 acpi_ioapic = 1;
 938
 939                                 smp_found_config = 1;
 940                                 clustered_apic_check();
 941                         }
 942                 }
 943                 if (error == -EINVAL) {
 944                         /*
 945                          * Dell Precision Workstation 410, 610 come here.
 946                          */
 947                         printk(KERN_ERR PREFIX
 948                                "Invalid BIOS MADT, disabling ACPI\n");
 949                         disable_acpi();
 950                 }
 951         }
 952 #endif
 953         return;
 954 }
 955
 956 #ifdef __i386__
 957
 958 static int __init disable_acpi_irq(struct dmi_system_id *d)
 959 {
 960         if (!acpi_force) {
 961                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
 962                        d->ident);
 963                 acpi_noirq_set();
 964         }
 965         return 0;
 966 }
 967
 968 static int __init disable_acpi_pci(struct dmi_system_id *d)
 969 {
 970         if (!acpi_force) {
 971                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
 972                        d->ident);
 973                 acpi_disable_pci();
 974         }
 975         return 0;
 976 }
 977
 978 static int __init dmi_disable_acpi(struct dmi_system_id *d)
 979 {
 980         if (!acpi_force) {
 981                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
 982                 disable_acpi();
 983         } else {
 984                 printk(KERN_NOTICE
 985                        "Warning: DMI blacklist says broken, but acpi forced\n");
 986         }
 987         return 0;
 988 }
 989
 990 /*
 991  * Limit ACPI to CPU enumeration for HT
 992  */
 993 static int __init force_acpi_ht(struct dmi_system_id *d)
 994 {
 995         if (!acpi_force) {
 996                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
 997                        d->ident);
 998                 disable_acpi();
 999                 acpi_ht = 1;
1000         } else {
1001                 printk(KERN_NOTICE
1002                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
1003         }
1004         return 0;
1005 }
1006
1007 /*
1008  * If your system is blacklisted here, but you find that acpi=force
1009  * works for you, please contact acpi-devel@sourceforge.net
1010  */
1011 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1012         /*
1013          * Boxes that need ACPI disabled
1014          */
1015         {
1016          .callback = dmi_disable_acpi,
1017          .ident = "IBM Thinkpad",
1018          .matches = {
1019                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1020                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1021                      },
1022          },
1023
1024         /*
1025          * Boxes that need acpi=ht
1026          */
1027         {
1028          .callback = force_acpi_ht,
1029          .ident = "FSC Primergy T850",
1030          .matches = {
1031                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1032                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
1033                      },
1034          },
1035         {
1036          .callback = force_acpi_ht,
1037          .ident = "DELL GX240",
1038          .matches = {
1039                      DMI_MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
1040                      DMI_MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
1041                      },
1042          },
1043         {
1044          .callback = force_acpi_ht,
1045          .ident = "HP VISUALIZE NT Workstation",
1046          .matches = {
1047                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1048                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1049                      },
1050          },
1051         {
1052          .callback = force_acpi_ht,
1053          .ident = "Compaq Workstation W8000",
1054          .matches = {
1055                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1056                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1057                      },
1058          },
1059         {
1060          .callback = force_acpi_ht,
1061          .ident = "ASUS P4B266",
1062          .matches = {
1063                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1064                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1065                      },
1066          },
1067         {
1068          .callback = force_acpi_ht,
1069          .ident = "ASUS P2B-DS",
1070          .matches = {
1071                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1072                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1073                      },
1074          },
1075         {
1076          .callback = force_acpi_ht,
1077          .ident = "ASUS CUR-DLS",
1078          .matches = {
1079                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1080                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1081                      },
1082          },
1083         {
1084          .callback = force_acpi_ht,
1085          .ident = "ABIT i440BX-W83977",
1086          .matches = {
1087                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1088                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1089                      },
1090          },
1091         {
1092          .callback = force_acpi_ht,
1093          .ident = "IBM Bladecenter",
1094          .matches = {
1095                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1096                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1097                      },
1098          },
1099         {
1100          .callback = force_acpi_ht,
1101          .ident = "IBM eServer xSeries 360",
1102          .matches = {
1103                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1104                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1105                      },
1106          },
1107         {
1108          .callback = force_acpi_ht,
1109          .ident = "IBM eserver xSeries 330",
1110          .matches = {
1111                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1112                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1113                      },
1114          },
1115         {
1116          .callback = force_acpi_ht,
1117          .ident = "IBM eserver xSeries 440",
1118          .matches = {
1119                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1120                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1121                      },
1122          },
1123
1124         /*
1125          * Boxes that need ACPI PCI IRQ routing disabled
1126          */
1127         {
1128          .callback = disable_acpi_irq,
1129          .ident = "ASUS A7V",
1130          .matches = {
1131                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1132                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1133                      /* newer BIOS, Revision 1011, does work */
1134                      DMI_MATCH(DMI_BIOS_VERSION,
1135                                "ASUS A7V ACPI BIOS Revision 1007"),
1136                      },
1137          },
1138
1139         /*
1140          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1141          */
1142         {                       /* _BBN 0 bug */
1143          .callback = disable_acpi_pci,
1144          .ident = "ASUS PR-DLS",
1145          .matches = {
1146                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1147                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1148                      DMI_MATCH(DMI_BIOS_VERSION,
1149                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1150                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1151                      },
1152          },
1153         {
1154          .callback = disable_acpi_pci,
1155          .ident = "Acer TravelMate 36x Laptop",
1156          .matches = {
1157                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1158                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1159                      },
1160          },
1161         {}
1162 };
1163
1164 #endif                          /* __i386__ */
1165
1166 /*
1167  * acpi_boot_table_init() and acpi_boot_init()
1168  *  called from setup_arch(), always.
1169  *      1. checksums all tables
1170  *      2. enumerates lapics
1171  *      3. enumerates io-apics
1172  *
1173  * acpi_table_init() is separate to allow reading SRAT without
1174  * other side effects.
1175  *
1176  * side effects of acpi_boot_init:
1177  *      acpi_lapic = 1 if LAPIC found
1178  *      acpi_ioapic = 1 if IOAPIC found
1179  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1180  *      if acpi_blacklisted() acpi_disabled = 1;
1181  *      acpi_irq_model=...
1182  *      ...
1183  *
1184  * return value: (currently ignored)
1185  *      0: success
1186  *      !0: failure
1187  */
1188
1189 int __init acpi_boot_table_init(void)
1190 {
1191         int error;
1192
1193 #ifdef __i386__
1194         dmi_check_system(acpi_dmi_table);
1195 #endif
1196
1197         /*
1198          * If acpi_disabled, bail out
1199          * One exception: acpi=ht continues far enough to enumerate LAPICs
1200          */
1201         if (acpi_disabled && !acpi_ht)
1202                 return 1;
1203
1204         /*
1205          * Initialize the ACPI boot-time table parser.
1206          */
1207         error = acpi_table_init();
1208         if (error) {
1209                 disable_acpi();
1210                 return error;
1211         }
1212
1213         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1214
1215         /*
1216          * blacklist may disable ACPI entirely
1217          */
1218         error = acpi_blacklisted();
1219         if (error) {
1220                 if (acpi_force) {
1221                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1222                 } else {
1223                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1224                         disable_acpi();
1225                         return error;
1226                 }
1227         }
1228
1229         return 0;
1230 }
1231
1232 int __init acpi_boot_init(void)
1233 {
1234         /*
1235          * If acpi_disabled, bail out
1236          * One exception: acpi=ht continues far enough to enumerate LAPICs
1237          */
1238         if (acpi_disabled && !acpi_ht)
1239                 return 1;
1240
1241         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1242
1243         /*
1244          * set sci_int and PM timer address
1245          */
1246         acpi_table_parse(ACPI_FADT, acpi_parse_fadt);
1247
1248         /*
1249          * Process the Multiple APIC Description Table (MADT), if present
1250          */
1251         acpi_process_madt();
1252
1253         acpi_table_parse(ACPI_HPET, acpi_parse_hpet);
1254
1255         return 0;
1256 }
1257
1258 static int __init parse_acpi(char *arg)
1259 {
1260         if (!arg)
1261                 return -EINVAL;
1262
1263         /* "acpi=off" disables both ACPI table parsing and interpreter */
1264         if (strcmp(arg, "off") == 0) {
1265                 disable_acpi();
1266         }
1267         /* acpi=force to over-ride black-list */
1268         else if (strcmp(arg, "force") == 0) {
1269                 acpi_force = 1;
1270                 acpi_ht = 1;
1271                 acpi_disabled = 0;
1272         }
1273         /* acpi=strict disables out-of-spec workarounds */
1274         else if (strcmp(arg, "strict") == 0) {
1275                 acpi_strict = 1;
1276         }
1277         /* Limit ACPI just to boot-time to enable HT */
1278         else if (strcmp(arg, "ht") == 0) {
1279                 if (!acpi_force)
1280                         disable_acpi();
1281                 acpi_ht = 1;
1282         }
1283         /* "acpi=noirq" disables ACPI interrupt routing */
1284         else if (strcmp(arg, "noirq") == 0) {
1285                 acpi_noirq_set();
1286         } else {
1287                 /* Core will printk when we return error. */
1288                 return -EINVAL;
1289         }
1290         return 0;
1291 }
1292 early_param("acpi", parse_acpi);
1293
1294 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1295 static int __init parse_pci(char *arg)
1296 {
1297         if (arg && strcmp(arg, "noacpi") == 0)
1298                 acpi_disable_pci();
1299         return 0;
1300 }
1301 early_param("pci", parse_pci);
1302
1303 #ifdef CONFIG_X86_IO_APIC
1304 static int __init parse_acpi_skip_timer_override(char *arg)
1305 {
1306         acpi_skip_timer_override = 1;
1307         return 0;
1308 }
1309 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1310 #endif /* CONFIG_X86_IO_APIC */
1311
1312 static int __init setup_acpi_sci(char *s)
1313 {
1314         if (!s)
1315                 return -EINVAL;
1316         if (!strcmp(s, "edge"))
1317                 acpi_sci_flags.trigger = 1;
1318         else if (!strcmp(s, "level"))
1319                 acpi_sci_flags.trigger = 3;
1320         else if (!strcmp(s, "high"))
1321                 acpi_sci_flags.polarity = 1;
1322         else if (!strcmp(s, "low"))
1323                 acpi_sci_flags.polarity = 3;
1324         else
1325                 return -EINVAL;
1326         return 0;
1327 }
1328 early_param("acpi_sci", setup_acpi_sci);