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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 #endif                          /* X86 */
  66
  67 #define BAD_MADT_ENTRY(entry, end) (                                        \
  68                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  69                 ((acpi_table_entry_header *)entry)->length < sizeof(*entry))
  70
  71 #define PREFIX                  "ACPI: "
  72
  73 int acpi_noirq;                         /* skip ACPI IRQ initialization */
  74 int acpi_pci_disabled __initdata;       /* skip ACPI PCI scan and IRQ initialization */
  75 int acpi_ht __initdata = 1;     /* enable HT */
  76
  77 int acpi_lapic;
  78 int acpi_ioapic;
  79 int acpi_strict;
  80 EXPORT_SYMBOL(acpi_strict);
  81
  82 acpi_interrupt_flags acpi_sci_flags __initdata;
  83 int acpi_sci_override_gsi __initdata;
  84 int acpi_skip_timer_override __initdata;
  85 int acpi_use_timer_override __initdata;
  86
  87 #ifdef CONFIG_X86_LOCAL_APIC
  88 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  89 #endif
  90
  91 #ifndef __HAVE_ARCH_CMPXCHG
  92 #warning ACPI uses CMPXCHG, i486 and later hardware
  93 #endif
  94
  95 #define MAX_MADT_ENTRIES        256
  96 u8 x86_acpiid_to_apicid[MAX_MADT_ENTRIES] =
  97     {[0 ... MAX_MADT_ENTRIES - 1] = 0xff };
  98 EXPORT_SYMBOL(x86_acpiid_to_apicid);
  99
 100 /* --------------------------------------------------------------------------
 101                               Boot-time Configuration
 102    -------------------------------------------------------------------------- */
 103
 104 /*
 105  * The default interrupt routing model is PIC (8259).  This gets
 106  * overriden if IOAPICs are enumerated (below).
 107  */
 108 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
 109
 110 #ifdef  CONFIG_X86_64
 111
 112 /* rely on all ACPI tables being in the direct mapping */
 113 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 114 {
 115         if (!phys_addr || !size)
 116                 return NULL;
 117
 118         if (phys_addr+size <= (end_pfn_map << PAGE_SHIFT) + PAGE_SIZE)
 119                 return __va(phys_addr);
 120
 121         return NULL;
 122 }
 123
 124 #else
 125
 126 /*
 127  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
 128  * to map the target physical address. The problem is that set_fixmap()
 129  * provides a single page, and it is possible that the page is not
 130  * sufficient.
 131  * By using this area, we can map up to MAX_IO_APICS pages temporarily,
 132  * i.e. until the next __va_range() call.
 133  *
 134  * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
 135  * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
 136  * count idx down while incrementing the phys address.
 137  */
 138 char *__acpi_map_table(unsigned long phys, unsigned long size)
 139 {
 140         unsigned long base, offset, mapped_size;
 141         int idx;
 142
 143         if (phys + size < 8 * 1024 * 1024)
 144                 return __va(phys);
 145
 146         offset = phys & (PAGE_SIZE - 1);
 147         mapped_size = PAGE_SIZE - offset;
 148         set_fixmap(FIX_ACPI_END, phys);
 149         base = fix_to_virt(FIX_ACPI_END);
 150
 151         /*
 152          * Most cases can be covered by the below.
 153          */
 154         idx = FIX_ACPI_END;
 155         while (mapped_size < size) {
 156                 if (--idx < FIX_ACPI_BEGIN)
 157                         return NULL;    /* cannot handle this */
 158                 phys += PAGE_SIZE;
 159                 set_fixmap(idx, phys);
 160                 mapped_size += PAGE_SIZE;
 161         }
 162
 163         return ((unsigned char *)base + offset);
 164 }
 165 #endif
 166
 167 #ifdef CONFIG_PCI_MMCONFIG
 168 /* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
 169 struct acpi_table_mcfg_config *pci_mmcfg_config;
 170 int pci_mmcfg_config_num;
 171
 172 int __init acpi_parse_mcfg(unsigned long phys_addr, unsigned long size)
 173 {
 174         struct acpi_table_mcfg *mcfg;
 175         unsigned long i;
 176         int config_size;
 177
 178         if (!phys_addr || !size)
 179                 return -EINVAL;
 180
 181         mcfg = (struct acpi_table_mcfg *)__acpi_map_table(phys_addr, size);
 182         if (!mcfg) {
 183                 printk(KERN_WARNING PREFIX "Unable to map MCFG\n");
 184                 return -ENODEV;
 185         }
 186
 187         /* how many config structures do we have */
 188         pci_mmcfg_config_num = 0;
 189         i = size - sizeof(struct acpi_table_mcfg);
 190         while (i >= sizeof(struct acpi_table_mcfg_config)) {
 191                 ++pci_mmcfg_config_num;
 192                 i -= sizeof(struct acpi_table_mcfg_config);
 193         };
 194         if (pci_mmcfg_config_num == 0) {
 195                 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
 196                 return -ENODEV;
 197         }
 198
 199         config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
 200         pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
 201         if (!pci_mmcfg_config) {
 202                 printk(KERN_WARNING PREFIX
 203                        "No memory for MCFG config tables\n");
 204                 return -ENOMEM;
 205         }
 206
 207         memcpy(pci_mmcfg_config, &mcfg->config, config_size);
 208         for (i = 0; i < pci_mmcfg_config_num; ++i) {
 209                 if (mcfg->config[i].base_reserved) {
 210                         printk(KERN_ERR PREFIX
 211                                "MMCONFIG not in low 4GB of memory\n");
 212                         kfree(pci_mmcfg_config);
 213                         pci_mmcfg_config_num = 0;
 214                         return -ENODEV;
 215                 }
 216         }
 217
 218         return 0;
 219 }
 220 #endif                          /* CONFIG_PCI_MMCONFIG */
 221
 222 #ifdef CONFIG_X86_LOCAL_APIC
 223 static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
 224 {
 225         struct acpi_table_madt *madt = NULL;
 226
 227         if (!phys_addr || !size || !cpu_has_apic)
 228                 return -EINVAL;
 229
 230         madt = (struct acpi_table_madt *)__acpi_map_table(phys_addr, size);
 231         if (!madt) {
 232                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
 233                 return -ENODEV;
 234         }
 235
 236         if (madt->lapic_address) {
 237                 acpi_lapic_addr = (u64) madt->lapic_address;
 238
 239                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
 240                        madt->lapic_address);
 241         }
 242
 243         acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
 244
 245         return 0;
 246 }
 247
 248 static int __init
 249 acpi_parse_lapic(acpi_table_entry_header * header, const unsigned long end)
 250 {
 251         struct acpi_table_lapic *processor = NULL;
 252
 253         processor = (struct acpi_table_lapic *)header;
 254
 255         if (BAD_MADT_ENTRY(processor, end))
 256                 return -EINVAL;
 257
 258         acpi_table_print_madt_entry(header);
 259
 260         /* Record local apic id only when enabled */
 261         if (processor->flags.enabled)
 262                 x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
 263
 264         /*
 265          * We need to register disabled CPU as well to permit
 266          * counting disabled CPUs. This allows us to size
 267          * cpus_possible_map more accurately, to permit
 268          * to not preallocating memory for all NR_CPUS
 269          * when we use CPU hotplug.
 270          */
 271         mp_register_lapic(processor->id,        /* APIC ID */
 272                           processor->flags.enabled);    /* Enabled? */
 273
 274         return 0;
 275 }
 276
 277 static int __init
 278 acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header,
 279                           const unsigned long end)
 280 {
 281         struct acpi_table_lapic_addr_ovr *lapic_addr_ovr = NULL;
 282
 283         lapic_addr_ovr = (struct acpi_table_lapic_addr_ovr *)header;
 284
 285         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
 286                 return -EINVAL;
 287
 288         acpi_lapic_addr = lapic_addr_ovr->address;
 289
 290         return 0;
 291 }
 292
 293 static int __init
 294 acpi_parse_lapic_nmi(acpi_table_entry_header * header, const unsigned long end)
 295 {
 296         struct acpi_table_lapic_nmi *lapic_nmi = NULL;
 297
 298         lapic_nmi = (struct acpi_table_lapic_nmi *)header;
 299
 300         if (BAD_MADT_ENTRY(lapic_nmi, end))
 301                 return -EINVAL;
 302
 303         acpi_table_print_madt_entry(header);
 304
 305         if (lapic_nmi->lint != 1)
 306                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
 307
 308         return 0;
 309 }
 310
 311 #endif                          /*CONFIG_X86_LOCAL_APIC */
 312
 313 #ifdef CONFIG_X86_IO_APIC
 314
 315 static int __init
 316 acpi_parse_ioapic(acpi_table_entry_header * header, const unsigned long end)
 317 {
 318         struct acpi_table_ioapic *ioapic = NULL;
 319
 320         ioapic = (struct acpi_table_ioapic *)header;
 321
 322         if (BAD_MADT_ENTRY(ioapic, end))
 323                 return -EINVAL;
 324
 325         acpi_table_print_madt_entry(header);
 326
 327         mp_register_ioapic(ioapic->id,
 328                            ioapic->address, ioapic->global_irq_base);
 329
 330         return 0;
 331 }
 332
 333 /*
 334  * Parse Interrupt Source Override for the ACPI SCI
 335  */
 336 static void acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
 337 {
 338         if (trigger == 0)       /* compatible SCI trigger is level */
 339                 trigger = 3;
 340
 341         if (polarity == 0)      /* compatible SCI polarity is low */
 342                 polarity = 3;
 343
 344         /* Command-line over-ride via acpi_sci= */
 345         if (acpi_sci_flags.trigger)
 346                 trigger = acpi_sci_flags.trigger;
 347
 348         if (acpi_sci_flags.polarity)
 349                 polarity = acpi_sci_flags.polarity;
 350
 351         /*
 352          * mp_config_acpi_legacy_irqs() already setup IRQs < 16
 353          * If GSI is < 16, this will update its flags,
 354          * else it will create a new mp_irqs[] entry.
 355          */
 356         mp_override_legacy_irq(gsi, polarity, trigger, gsi);
 357
 358         /*
 359          * stash over-ride to indicate we've been here
 360          * and for later update of acpi_fadt
 361          */
 362         acpi_sci_override_gsi = gsi;
 363         return;
 364 }
 365
 366 static int __init
 367 acpi_parse_int_src_ovr(acpi_table_entry_header * header,
 368                        const unsigned long end)
 369 {
 370         struct acpi_table_int_src_ovr *intsrc = NULL;
 371
 372         intsrc = (struct acpi_table_int_src_ovr *)header;
 373
 374         if (BAD_MADT_ENTRY(intsrc, end))
 375                 return -EINVAL;
 376
 377         acpi_table_print_madt_entry(header);
 378
 379         if (intsrc->bus_irq == acpi_fadt.sci_int) {
 380                 acpi_sci_ioapic_setup(intsrc->global_irq,
 381                                       intsrc->flags.polarity,
 382                                       intsrc->flags.trigger);
 383                 return 0;
 384         }
 385
 386         if (acpi_skip_timer_override &&
 387             intsrc->bus_irq == 0 && intsrc->global_irq == 2) {
 388                 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
 389                 return 0;
 390         }
 391
 392         mp_override_legacy_irq(intsrc->bus_irq,
 393                                intsrc->flags.polarity,
 394                                intsrc->flags.trigger, intsrc->global_irq);
 395
 396         return 0;
 397 }
 398
 399 static int __init
 400 acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
 401 {
 402         struct acpi_table_nmi_src *nmi_src = NULL;
 403
 404         nmi_src = (struct acpi_table_nmi_src *)header;
 405
 406         if (BAD_MADT_ENTRY(nmi_src, end))
 407                 return -EINVAL;
 408
 409         acpi_table_print_madt_entry(header);
 410
 411         /* TBD: Support nimsrc entries? */
 412
 413         return 0;
 414 }
 415
 416 #endif                          /* CONFIG_X86_IO_APIC */
 417
 418 /*
 419  * acpi_pic_sci_set_trigger()
 420  *
 421  * use ELCR to set PIC-mode trigger type for SCI
 422  *
 423  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 424  * it may require Edge Trigger -- use "acpi_sci=edge"
 425  *
 426  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 427  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 428  * ECLR1 is IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
 429  * ECLR2 is IRQ's 8-15 (IRQ 8, 13 must be 0)
 430  */
 431
 432 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
 433 {
 434         unsigned int mask = 1 << irq;
 435         unsigned int old, new;
 436
 437         /* Real old ELCR mask */
 438         old = inb(0x4d0) | (inb(0x4d1) << 8);
 439
 440         /*
 441          * If we use ACPI to set PCI irq's, then we should clear ELCR
 442          * since we will set it correctly as we enable the PCI irq
 443          * routing.
 444          */
 445         new = acpi_noirq ? old : 0;
 446
 447         /*
 448          * Update SCI information in the ELCR, it isn't in the PCI
 449          * routing tables..
 450          */
 451         switch (trigger) {
 452         case 1:         /* Edge - clear */
 453                 new &= ~mask;
 454                 break;
 455         case 3:         /* Level - set */
 456                 new |= mask;
 457                 break;
 458         }
 459
 460         if (old == new)
 461                 return;
 462
 463         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
 464         outb(new, 0x4d0);
 465         outb(new >> 8, 0x4d1);
 466 }
 467
 468 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 469 {
 470         *irq = gsi;
 471         return 0;
 472 }
 473
 474 /*
 475  * success: return IRQ number (>=0)
 476  * failure: return < 0
 477  */
 478 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 479 {
 480         unsigned int irq;
 481         unsigned int plat_gsi = gsi;
 482
 483 #ifdef CONFIG_PCI
 484         /*
 485          * Make sure all (legacy) PCI IRQs are set as level-triggered.
 486          */
 487         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
 488                 extern void eisa_set_level_irq(unsigned int irq);
 489
 490                 if (triggering == ACPI_LEVEL_SENSITIVE)
 491                         eisa_set_level_irq(gsi);
 492         }
 493 #endif
 494
 495 #ifdef CONFIG_X86_IO_APIC
 496         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
 497                 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
 498         }
 499 #endif
 500         acpi_gsi_to_irq(plat_gsi, &irq);
 501         return irq;
 502 }
 503
 504 EXPORT_SYMBOL(acpi_register_gsi);
 505
 506 /*
 507  *  ACPI based hotplug support for CPU
 508  */
 509 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 510 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 511 {
 512         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 513         union acpi_object *obj;
 514         struct acpi_table_lapic *lapic;
 515         cpumask_t tmp_map, new_map;
 516         u8 physid;
 517         int cpu;
 518
 519         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 520                 return -EINVAL;
 521
 522         if (!buffer.length || !buffer.pointer)
 523                 return -EINVAL;
 524
 525         obj = buffer.pointer;
 526         if (obj->type != ACPI_TYPE_BUFFER ||
 527             obj->buffer.length < sizeof(*lapic)) {
 528                 kfree(buffer.pointer);
 529                 return -EINVAL;
 530         }
 531
 532         lapic = (struct acpi_table_lapic *)obj->buffer.pointer;
 533
 534         if ((lapic->header.type != ACPI_MADT_LAPIC) ||
 535             (!lapic->flags.enabled)) {
 536                 kfree(buffer.pointer);
 537                 return -EINVAL;
 538         }
 539
 540         physid = lapic->id;
 541
 542         kfree(buffer.pointer);
 543         buffer.length = ACPI_ALLOCATE_BUFFER;
 544         buffer.pointer = NULL;
 545
 546         tmp_map = cpu_present_map;
 547         mp_register_lapic(physid, lapic->flags.enabled);
 548
 549         /*
 550          * If mp_register_lapic successfully generates a new logical cpu
 551          * number, then the following will get us exactly what was mapped
 552          */
 553         cpus_andnot(new_map, cpu_present_map, tmp_map);
 554         if (cpus_empty(new_map)) {
 555                 printk ("Unable to map lapic to logical cpu number\n");
 556                 return -EINVAL;
 557         }
 558
 559         cpu = first_cpu(new_map);
 560
 561         *pcpu = cpu;
 562         return 0;
 563 }
 564
 565 EXPORT_SYMBOL(acpi_map_lsapic);
 566
 567 int acpi_unmap_lsapic(int cpu)
 568 {
 569         int i;
 570
 571         for_each_possible_cpu(i) {
 572                 if (x86_acpiid_to_apicid[i] == x86_cpu_to_apicid[cpu]) {
 573                         x86_acpiid_to_apicid[i] = -1;
 574                         break;
 575                 }
 576         }
 577         x86_cpu_to_apicid[cpu] = -1;
 578         cpu_clear(cpu, cpu_present_map);
 579         num_processors--;
 580
 581         return (0);
 582 }
 583
 584 EXPORT_SYMBOL(acpi_unmap_lsapic);
 585 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 586
 587 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 588 {
 589         /* TBD */
 590         return -EINVAL;
 591 }
 592
 593 EXPORT_SYMBOL(acpi_register_ioapic);
 594
 595 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 596 {
 597         /* TBD */
 598         return -EINVAL;
 599 }
 600
 601 EXPORT_SYMBOL(acpi_unregister_ioapic);
 602
 603 static unsigned long __init
 604 acpi_scan_rsdp(unsigned long start, unsigned long length)
 605 {
 606         unsigned long offset = 0;
 607         unsigned long sig_len = sizeof("RSD PTR ") - 1;
 608
 609         /*
 610          * Scan all 16-byte boundaries of the physical memory region for the
 611          * RSDP signature.
 612          */
 613         for (offset = 0; offset < length; offset += 16) {
 614                 if (strncmp((char *)(phys_to_virt(start) + offset), "RSD PTR ", sig_len))
 615                         continue;
 616                 return (start + offset);
 617         }
 618
 619         return 0;
 620 }
 621
 622 static int __init acpi_parse_sbf(unsigned long phys_addr, unsigned long size)
 623 {
 624         struct acpi_table_sbf *sb;
 625
 626         if (!phys_addr || !size)
 627                 return -EINVAL;
 628
 629         sb = (struct acpi_table_sbf *)__acpi_map_table(phys_addr, size);
 630         if (!sb) {
 631                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
 632                 return -ENODEV;
 633         }
 634
 635         sbf_port = sb->sbf_cmos;        /* Save CMOS port */
 636
 637         return 0;
 638 }
 639
 640 #ifdef CONFIG_HPET_TIMER
 641
 642 static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
 643 {
 644         struct acpi_table_hpet *hpet_tbl;
 645         struct resource *hpet_res;
 646         resource_size_t res_start;
 647
 648         if (!phys || !size)
 649                 return -EINVAL;
 650
 651         hpet_tbl = (struct acpi_table_hpet *)__acpi_map_table(phys, size);
 652         if (!hpet_tbl) {
 653                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
 654                 return -ENODEV;
 655         }
 656
 657         if (hpet_tbl->addr.space_id != ACPI_SPACE_MEM) {
 658                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 659                        "memory.\n");
 660                 return -1;
 661         }
 662
 663 #define HPET_RESOURCE_NAME_SIZE 9
 664         hpet_res = alloc_bootmem(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
 665         if (hpet_res) {
 666                 memset(hpet_res, 0, sizeof(*hpet_res));
 667                 hpet_res->name = (void *)&hpet_res[1];
 668                 hpet_res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 669                 snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE,
 670                          "HPET %u", hpet_tbl->number);
 671                 hpet_res->end = (1 * 1024) - 1;
 672         }
 673
 674 #ifdef  CONFIG_X86_64
 675         vxtime.hpet_address = hpet_tbl->addr.addrl |
 676             ((long)hpet_tbl->addr.addrh << 32);
 677
 678         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 679                hpet_tbl->id, vxtime.hpet_address);
 680
 681         res_start = vxtime.hpet_address;
 682 #else                           /* X86 */
 683         {
 684                 extern unsigned long hpet_address;
 685
 686                 hpet_address = hpet_tbl->addr.addrl;
 687                 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 688                        hpet_tbl->id, hpet_address);
 689
 690                 res_start = hpet_address;
 691         }
 692 #endif                          /* X86 */
 693
 694         if (hpet_res) {
 695                 hpet_res->start = res_start;
 696                 hpet_res->end += res_start;
 697                 insert_resource(&iomem_resource, hpet_res);
 698         }
 699
 700         return 0;
 701 }
 702 #else
 703 #define acpi_parse_hpet NULL
 704 #endif
 705
 706 #ifdef CONFIG_X86_PM_TIMER
 707 extern u32 pmtmr_ioport;
 708 #endif
 709
 710 static int __init acpi_parse_fadt(unsigned long phys, unsigned long size)
 711 {
 712         struct fadt_descriptor *fadt = NULL;
 713
 714         fadt = (struct fadt_descriptor *)__acpi_map_table(phys, size);
 715         if (!fadt) {
 716                 printk(KERN_WARNING PREFIX "Unable to map FADT\n");
 717                 return 0;
 718         }
 719         /* initialize sci_int early for INT_SRC_OVR MADT parsing */
 720         acpi_fadt.sci_int = fadt->sci_int;
 721
 722         /* initialize rev and apic_phys_dest_mode for x86_64 genapic */
 723         acpi_fadt.revision = fadt->revision;
 724         acpi_fadt.force_apic_physical_destination_mode =
 725             fadt->force_apic_physical_destination_mode;
 726
 727 #ifdef CONFIG_X86_PM_TIMER
 728         /* detect the location of the ACPI PM Timer */
 729         if (fadt->revision >= FADT2_REVISION_ID) {
 730                 /* FADT rev. 2 */
 731                 if (fadt->xpm_tmr_blk.address_space_id !=
 732                     ACPI_ADR_SPACE_SYSTEM_IO)
 733                         return 0;
 734
 735                 pmtmr_ioport = fadt->xpm_tmr_blk.address;
 736                 /*
 737                  * "X" fields are optional extensions to the original V1.0
 738                  * fields, so we must selectively expand V1.0 fields if the
 739                  * corresponding X field is zero.
 740                  */
 741                 if (!pmtmr_ioport)
 742                         pmtmr_ioport = fadt->V1_pm_tmr_blk;
 743         } else {
 744                 /* FADT rev. 1 */
 745                 pmtmr_ioport = fadt->V1_pm_tmr_blk;
 746         }
 747         if (pmtmr_ioport)
 748                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 749                        pmtmr_ioport);
 750 #endif
 751         return 0;
 752 }
 753
 754 unsigned long __init acpi_find_rsdp(void)
 755 {
 756         unsigned long rsdp_phys = 0;
 757
 758         if (efi_enabled) {
 759                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 760                         return efi.acpi20;
 761                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 762                         return efi.acpi;
 763         }
 764         /*
 765          * Scan memory looking for the RSDP signature. First search EBDA (low
 766          * memory) paragraphs and then search upper memory (E0000-FFFFF).
 767          */
 768         rsdp_phys = acpi_scan_rsdp(0, 0x400);
 769         if (!rsdp_phys)
 770                 rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);
 771
 772         return rsdp_phys;
 773 }
 774
 775 #ifdef  CONFIG_X86_LOCAL_APIC
 776 /*
 777  * Parse LAPIC entries in MADT
 778  * returns 0 on success, < 0 on error
 779  */
 780 static int __init acpi_parse_madt_lapic_entries(void)
 781 {
 782         int count;
 783
 784         if (!cpu_has_apic)
 785                 return -ENODEV;
 786
 787         /*
 788          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 789          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 790          */
 791
 792         count =
 793             acpi_table_parse_madt(ACPI_MADT_LAPIC_ADDR_OVR,
 794                                   acpi_parse_lapic_addr_ovr, 0);
 795         if (count < 0) {
 796                 printk(KERN_ERR PREFIX
 797                        "Error parsing LAPIC address override entry\n");
 798                 return count;
 799         }
 800
 801         mp_register_lapic_address(acpi_lapic_addr);
 802
 803         count = acpi_table_parse_madt(ACPI_MADT_LAPIC, acpi_parse_lapic,
 804                                       MAX_APICS);
 805         if (!count) {
 806                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 807                 /* TBD: Cleanup to allow fallback to MPS */
 808                 return -ENODEV;
 809         } else if (count < 0) {
 810                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 811                 /* TBD: Cleanup to allow fallback to MPS */
 812                 return count;
 813         }
 814
 815         count =
 816             acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0);
 817         if (count < 0) {
 818                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 819                 /* TBD: Cleanup to allow fallback to MPS */
 820                 return count;
 821         }
 822         return 0;
 823 }
 824 #endif                          /* CONFIG_X86_LOCAL_APIC */
 825
 826 #ifdef  CONFIG_X86_IO_APIC
 827 /*
 828  * Parse IOAPIC related entries in MADT
 829  * returns 0 on success, < 0 on error
 830  */
 831 static int __init acpi_parse_madt_ioapic_entries(void)
 832 {
 833         int count;
 834
 835         /*
 836          * ACPI interpreter is required to complete interrupt setup,
 837          * so if it is off, don't enumerate the io-apics with ACPI.
 838          * If MPS is present, it will handle them,
 839          * otherwise the system will stay in PIC mode
 840          */
 841         if (acpi_disabled || acpi_noirq) {
 842                 return -ENODEV;
 843         }
 844
 845         if (!cpu_has_apic)
 846                 return -ENODEV;
 847
 848         /*
 849          * if "noapic" boot option, don't look for IO-APICs
 850          */
 851         if (skip_ioapic_setup) {
 852                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 853                        "due to 'noapic' option.\n");
 854                 return -ENODEV;
 855         }
 856
 857         count =
 858             acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic,
 859                                   MAX_IO_APICS);
 860         if (!count) {
 861                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 862                 return -ENODEV;
 863         } else if (count < 0) {
 864                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 865                 return count;
 866         }
 867
 868         count =
 869             acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr,
 870                                   NR_IRQ_VECTORS);
 871         if (count < 0) {
 872                 printk(KERN_ERR PREFIX
 873                        "Error parsing interrupt source overrides entry\n");
 874                 /* TBD: Cleanup to allow fallback to MPS */
 875                 return count;
 876         }
 877
 878         /*
 879          * If BIOS did not supply an INT_SRC_OVR for the SCI
 880          * pretend we got one so we can set the SCI flags.
 881          */
 882         if (!acpi_sci_override_gsi)
 883                 acpi_sci_ioapic_setup(acpi_fadt.sci_int, 0, 0);
 884
 885         /* Fill in identity legacy mapings where no override */
 886         mp_config_acpi_legacy_irqs();
 887
 888         count =
 889             acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src,
 890                                   NR_IRQ_VECTORS);
 891         if (count < 0) {
 892                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 893                 /* TBD: Cleanup to allow fallback to MPS */
 894                 return count;
 895         }
 896
 897         return 0;
 898 }
 899 #else
 900 static inline int acpi_parse_madt_ioapic_entries(void)
 901 {
 902         return -1;
 903 }
 904 #endif  /* !CONFIG_X86_IO_APIC */
 905
 906 static void __init acpi_process_madt(void)
 907 {
 908 #ifdef CONFIG_X86_LOCAL_APIC
 909         int count, error;
 910
 911         count = acpi_table_parse(ACPI_APIC, acpi_parse_madt);
 912         if (count >= 1) {
 913
 914                 /*
 915                  * Parse MADT LAPIC entries
 916                  */
 917                 error = acpi_parse_madt_lapic_entries();
 918                 if (!error) {
 919                         acpi_lapic = 1;
 920
 921 #ifdef CONFIG_X86_GENERICARCH
 922                         generic_bigsmp_probe();
 923 #endif
 924                         /*
 925                          * Parse MADT IO-APIC entries
 926                          */
 927                         error = acpi_parse_madt_ioapic_entries();
 928                         if (!error) {
 929                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 930                                 acpi_irq_balance_set(NULL);
 931                                 acpi_ioapic = 1;
 932
 933                                 smp_found_config = 1;
 934                                 clustered_apic_check();
 935                         }
 936                 }
 937                 if (error == -EINVAL) {
 938                         /*
 939                          * Dell Precision Workstation 410, 610 come here.
 940                          */
 941                         printk(KERN_ERR PREFIX
 942                                "Invalid BIOS MADT, disabling ACPI\n");
 943                         disable_acpi();
 944                 }
 945         }
 946 #endif
 947         return;
 948 }
 949
 950 #ifdef __i386__
 951
 952 static int __init disable_acpi_irq(struct dmi_system_id *d)
 953 {
 954         if (!acpi_force) {
 955                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
 956                        d->ident);
 957                 acpi_noirq_set();
 958         }
 959         return 0;
 960 }
 961
 962 static int __init disable_acpi_pci(struct dmi_system_id *d)
 963 {
 964         if (!acpi_force) {
 965                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
 966                        d->ident);
 967                 acpi_disable_pci();
 968         }
 969         return 0;
 970 }
 971
 972 static int __init dmi_disable_acpi(struct dmi_system_id *d)
 973 {
 974         if (!acpi_force) {
 975                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
 976                 disable_acpi();
 977         } else {
 978                 printk(KERN_NOTICE
 979                        "Warning: DMI blacklist says broken, but acpi forced\n");
 980         }
 981         return 0;
 982 }
 983
 984 /*
 985  * Limit ACPI to CPU enumeration for HT
 986  */
 987 static int __init force_acpi_ht(struct dmi_system_id *d)
 988 {
 989         if (!acpi_force) {
 990                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
 991                        d->ident);
 992                 disable_acpi();
 993                 acpi_ht = 1;
 994         } else {
 995                 printk(KERN_NOTICE
 996                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
 997         }
 998         return 0;
 999 }
1000
1001 /*
1002  * If your system is blacklisted here, but you find that acpi=force
1003  * works for you, please contact acpi-devel@sourceforge.net
1004  */
1005 static struct dmi_system_id __initdata acpi_dmi_table[] = {
1006         /*
1007          * Boxes that need ACPI disabled
1008          */
1009         {
1010          .callback = dmi_disable_acpi,
1011          .ident = "IBM Thinkpad",
1012          .matches = {
1013                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1014                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1015                      },
1016          },
1017
1018         /*
1019          * Boxes that need acpi=ht
1020          */
1021         {
1022          .callback = force_acpi_ht,
1023          .ident = "FSC Primergy T850",
1024          .matches = {
1025                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1026                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
1027                      },
1028          },
1029         {
1030          .callback = force_acpi_ht,
1031          .ident = "DELL GX240",
1032          .matches = {
1033                      DMI_MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
1034                      DMI_MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
1035                      },
1036          },
1037         {
1038          .callback = force_acpi_ht,
1039          .ident = "HP VISUALIZE NT Workstation",
1040          .matches = {
1041                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
1042                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
1043                      },
1044          },
1045         {
1046          .callback = force_acpi_ht,
1047          .ident = "Compaq Workstation W8000",
1048          .matches = {
1049                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
1050                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
1051                      },
1052          },
1053         {
1054          .callback = force_acpi_ht,
1055          .ident = "ASUS P4B266",
1056          .matches = {
1057                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1058                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
1059                      },
1060          },
1061         {
1062          .callback = force_acpi_ht,
1063          .ident = "ASUS P2B-DS",
1064          .matches = {
1065                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1066                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
1067                      },
1068          },
1069         {
1070          .callback = force_acpi_ht,
1071          .ident = "ASUS CUR-DLS",
1072          .matches = {
1073                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1074                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
1075                      },
1076          },
1077         {
1078          .callback = force_acpi_ht,
1079          .ident = "ABIT i440BX-W83977",
1080          .matches = {
1081                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1082                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1083                      },
1084          },
1085         {
1086          .callback = force_acpi_ht,
1087          .ident = "IBM Bladecenter",
1088          .matches = {
1089                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1090                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1091                      },
1092          },
1093         {
1094          .callback = force_acpi_ht,
1095          .ident = "IBM eServer xSeries 360",
1096          .matches = {
1097                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1098                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1099                      },
1100          },
1101         {
1102          .callback = force_acpi_ht,
1103          .ident = "IBM eserver xSeries 330",
1104          .matches = {
1105                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1106                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1107                      },
1108          },
1109         {
1110          .callback = force_acpi_ht,
1111          .ident = "IBM eserver xSeries 440",
1112          .matches = {
1113                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1114                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1115                      },
1116          },
1117
1118         /*
1119          * Boxes that need ACPI PCI IRQ routing disabled
1120          */
1121         {
1122          .callback = disable_acpi_irq,
1123          .ident = "ASUS A7V",
1124          .matches = {
1125                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1126                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1127                      /* newer BIOS, Revision 1011, does work */
1128                      DMI_MATCH(DMI_BIOS_VERSION,
1129                                "ASUS A7V ACPI BIOS Revision 1007"),
1130                      },
1131          },
1132
1133         /*
1134          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1135          */
1136         {                       /* _BBN 0 bug */
1137          .callback = disable_acpi_pci,
1138          .ident = "ASUS PR-DLS",
1139          .matches = {
1140                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1141                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1142                      DMI_MATCH(DMI_BIOS_VERSION,
1143                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1144                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1145                      },
1146          },
1147         {
1148          .callback = disable_acpi_pci,
1149          .ident = "Acer TravelMate 36x Laptop",
1150          .matches = {
1151                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1152                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1153                      },
1154          },
1155         {}
1156 };
1157
1158 #endif                          /* __i386__ */
1159
1160 /*
1161  * acpi_boot_table_init() and acpi_boot_init()
1162  *  called from setup_arch(), always.
1163  *      1. checksums all tables
1164  *      2. enumerates lapics
1165  *      3. enumerates io-apics
1166  *
1167  * acpi_table_init() is separate to allow reading SRAT without
1168  * other side effects.
1169  *
1170  * side effects of acpi_boot_init:
1171  *      acpi_lapic = 1 if LAPIC found
1172  *      acpi_ioapic = 1 if IOAPIC found
1173  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1174  *      if acpi_blacklisted() acpi_disabled = 1;
1175  *      acpi_irq_model=...
1176  *      ...
1177  *
1178  * return value: (currently ignored)
1179  *      0: success
1180  *      !0: failure
1181  */
1182
1183 int __init acpi_boot_table_init(void)
1184 {
1185         int error;
1186
1187 #ifdef __i386__
1188         dmi_check_system(acpi_dmi_table);
1189 #endif
1190
1191         /*
1192          * If acpi_disabled, bail out
1193          * One exception: acpi=ht continues far enough to enumerate LAPICs
1194          */
1195         if (acpi_disabled && !acpi_ht)
1196                 return 1;
1197
1198         /*
1199          * Initialize the ACPI boot-time table parser.
1200          */
1201         error = acpi_table_init();
1202         if (error) {
1203                 disable_acpi();
1204                 return error;
1205         }
1206
1207         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1208
1209         /*
1210          * blacklist may disable ACPI entirely
1211          */
1212         error = acpi_blacklisted();
1213         if (error) {
1214                 if (acpi_force) {
1215                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1216                 } else {
1217                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1218                         disable_acpi();
1219                         return error;
1220                 }
1221         }
1222
1223         return 0;
1224 }
1225
1226 int __init acpi_boot_init(void)
1227 {
1228         /*
1229          * If acpi_disabled, bail out
1230          * One exception: acpi=ht continues far enough to enumerate LAPICs
1231          */
1232         if (acpi_disabled && !acpi_ht)
1233                 return 1;
1234
1235         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1236
1237         /*
1238          * set sci_int and PM timer address
1239          */
1240         acpi_table_parse(ACPI_FADT, acpi_parse_fadt);
1241
1242         /*
1243          * Process the Multiple APIC Description Table (MADT), if present
1244          */
1245         acpi_process_madt();
1246
1247         acpi_table_parse(ACPI_HPET, acpi_parse_hpet);
1248
1249         return 0;
1250 }
1251
1252 static int __init parse_acpi(char *arg)
1253 {
1254         if (!arg)
1255                 return -EINVAL;
1256
1257         /* "acpi=off" disables both ACPI table parsing and interpreter */
1258         if (strcmp(arg, "off") == 0) {
1259                 disable_acpi();
1260         }
1261         /* acpi=force to over-ride black-list */
1262         else if (strcmp(arg, "force") == 0) {
1263                 acpi_force = 1;
1264                 acpi_ht = 1;
1265                 acpi_disabled = 0;
1266         }
1267         /* acpi=strict disables out-of-spec workarounds */
1268         else if (strcmp(arg, "strict") == 0) {
1269                 acpi_strict = 1;
1270         }
1271         /* Limit ACPI just to boot-time to enable HT */
1272         else if (strcmp(arg, "ht") == 0) {
1273                 if (!acpi_force)
1274                         disable_acpi();
1275                 acpi_ht = 1;
1276         }
1277         /* "acpi=noirq" disables ACPI interrupt routing */
1278         else if (strcmp(arg, "noirq") == 0) {
1279                 acpi_noirq_set();
1280         } else {
1281                 /* Core will printk when we return error. */
1282                 return -EINVAL;
1283         }
1284         return 0;
1285 }
1286 early_param("acpi", parse_acpi);
1287
1288 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1289 static int __init parse_pci(char *arg)
1290 {
1291         if (arg && strcmp(arg, "noacpi") == 0)
1292                 acpi_disable_pci();
1293         return 0;
1294 }
1295 early_param("pci", parse_pci);
1296
1297 #ifdef CONFIG_X86_IO_APIC
1298 static int __init parse_acpi_skip_timer_override(char *arg)
1299 {
1300         acpi_skip_timer_override = 1;
1301         return 0;
1302 }
1303 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1304
1305 static int __init parse_acpi_use_timer_override(char *arg)
1306 {
1307         acpi_use_timer_override = 1;
1308         return 0;
1309 }
1310 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1311 #endif /* CONFIG_X86_IO_APIC */
1312
1313 static int __init setup_acpi_sci(char *s)
1314 {
1315         if (!s)
1316                 return -EINVAL;
1317         if (!strcmp(s, "edge"))
1318                 acpi_sci_flags.trigger = 1;
1319         else if (!strcmp(s, "level"))
1320                 acpi_sci_flags.trigger = 3;
1321         else if (!strcmp(s, "high"))
1322                 acpi_sci_flags.polarity = 1;
1323         else if (!strcmp(s, "low"))
1324                 acpi_sci_flags.polarity = 3;
1325         else
1326                 return -EINVAL;
1327         return 0;
1328 }
1329 early_param("acpi_sci", setup_acpi_sci);