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/module.h>
  30 #include <linux/dmi.h>
  31 #include <linux/irq.h>
  32
  33 #include <asm/pgtable.h>
  34 #include <asm/io_apic.h>
  35 #include <asm/apic.h>
  36 #include <asm/io.h>
  37 #include <asm/mpspec.h>
  38
  39 int __initdata acpi_force = 0;
  40
  41 #ifdef  CONFIG_ACPI
  42 int acpi_disabled = 0;
  43 #else
  44 int acpi_disabled = 1;
  45 #endif
  46 EXPORT_SYMBOL(acpi_disabled);
  47
  48 #ifdef  CONFIG_X86_64
  49
  50 #include <asm/proto.h>
  51
  52 static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return 0; }
  53
  54
  55 #else                           /* X86 */
  56
  57 #ifdef  CONFIG_X86_LOCAL_APIC
  58 #include <mach_apic.h>
  59 #include <mach_mpparse.h>
  60 #endif                          /* CONFIG_X86_LOCAL_APIC */
  61
  62 static inline int gsi_irq_sharing(int gsi) { return gsi; }
  63
  64 #endif                          /* X86 */
  65
  66 #define BAD_MADT_ENTRY(entry, end) (                                        \
  67                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  68                 ((acpi_table_entry_header *)entry)->length < sizeof(*entry))
  69
  70 #define PREFIX                  "ACPI: "
  71
  72 int acpi_noirq __initdata;      /* skip ACPI IRQ initialization */
  73 int acpi_pci_disabled __initdata;       /* skip ACPI PCI scan and IRQ initialization */
  74 int acpi_ht __initdata = 1;     /* enable HT */
  75
  76 int acpi_lapic;
  77 int acpi_ioapic;
  78 int acpi_strict;
  79 EXPORT_SYMBOL(acpi_strict);
  80
  81 acpi_interrupt_flags acpi_sci_flags __initdata;
  82 int acpi_sci_override_gsi __initdata;
  83 int acpi_skip_timer_override __initdata;
  84
  85 #ifdef CONFIG_X86_LOCAL_APIC
  86 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  87 #endif
  88
  89 #ifndef __HAVE_ARCH_CMPXCHG
  90 #warning ACPI uses CMPXCHG, i486 and later hardware
  91 #endif
  92
  93 #define MAX_MADT_ENTRIES        256
  94 u8 x86_acpiid_to_apicid[MAX_MADT_ENTRIES] =
  95     {[0 ... MAX_MADT_ENTRIES - 1] = 0xff };
  96 EXPORT_SYMBOL(x86_acpiid_to_apicid);
  97
  98 /* --------------------------------------------------------------------------
  99                               Boot-time Configuration
 100    -------------------------------------------------------------------------- */
 101
 102 /*
 103  * The default interrupt routing model is PIC (8259).  This gets
 104  * overriden if IOAPICs are enumerated (below).
 105  */
 106 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
 107
 108 #ifdef  CONFIG_X86_64
 109
 110 /* rely on all ACPI tables being in the direct mapping */
 111 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 112 {
 113         if (!phys_addr || !size)
 114                 return NULL;
 115
 116         if (phys_addr+size <= (end_pfn_map << PAGE_SHIFT) + PAGE_SIZE)
 117                 return __va(phys_addr);
 118
 119         return NULL;
 120 }
 121
 122 #else
 123
 124 /*
 125  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
 126  * to map the target physical address. The problem is that set_fixmap()
 127  * provides a single page, and it is possible that the page is not
 128  * sufficient.
 129  * By using this area, we can map up to MAX_IO_APICS pages temporarily,
 130  * i.e. until the next __va_range() call.
 131  *
 132  * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
 133  * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
 134  * count idx down while incrementing the phys address.
 135  */
 136 char *__acpi_map_table(unsigned long phys, unsigned long size)
 137 {
 138         unsigned long base, offset, mapped_size;
 139         int idx;
 140
 141         if (phys + size < 8 * 1024 * 1024)
 142                 return __va(phys);
 143
 144         offset = phys & (PAGE_SIZE - 1);
 145         mapped_size = PAGE_SIZE - offset;
 146         set_fixmap(FIX_ACPI_END, phys);
 147         base = fix_to_virt(FIX_ACPI_END);
 148
 149         /*
 150          * Most cases can be covered by the below.
 151          */
 152         idx = FIX_ACPI_END;
 153         while (mapped_size < size) {
 154                 if (--idx < FIX_ACPI_BEGIN)
 155                         return NULL;    /* cannot handle this */
 156                 phys += PAGE_SIZE;
 157                 set_fixmap(idx, phys);
 158                 mapped_size += PAGE_SIZE;
 159         }
 160
 161         return ((unsigned char *)base + offset);
 162 }
 163 #endif
 164
 165 #ifdef CONFIG_PCI_MMCONFIG
 166 /* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
 167 struct acpi_table_mcfg_config *pci_mmcfg_config;
 168 int pci_mmcfg_config_num;
 169
 170 int __init acpi_parse_mcfg(unsigned long phys_addr, unsigned long size)
 171 {
 172         struct acpi_table_mcfg *mcfg;
 173         unsigned long i;
 174         int config_size;
 175
 176         if (!phys_addr || !size)
 177                 return -EINVAL;
 178
 179         mcfg = (struct acpi_table_mcfg *)__acpi_map_table(phys_addr, size);
 180         if (!mcfg) {
 181                 printk(KERN_WARNING PREFIX "Unable to map MCFG\n");
 182                 return -ENODEV;
 183         }
 184
 185         /* how many config structures do we have */
 186         pci_mmcfg_config_num = 0;
 187         i = size - sizeof(struct acpi_table_mcfg);
 188         while (i >= sizeof(struct acpi_table_mcfg_config)) {
 189                 ++pci_mmcfg_config_num;
 190                 i -= sizeof(struct acpi_table_mcfg_config);
 191         };
 192         if (pci_mmcfg_config_num == 0) {
 193                 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
 194                 return -ENODEV;
 195         }
 196
 197         config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
 198         pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
 199         if (!pci_mmcfg_config) {
 200                 printk(KERN_WARNING PREFIX
 201                        "No memory for MCFG config tables\n");
 202                 return -ENOMEM;
 203         }
 204
 205         memcpy(pci_mmcfg_config, &mcfg->config, config_size);
 206         for (i = 0; i < pci_mmcfg_config_num; ++i) {
 207                 if (mcfg->config[i].base_reserved) {
 208                         printk(KERN_ERR PREFIX
 209                                "MMCONFIG not in low 4GB of memory\n");
 210                         kfree(pci_mmcfg_config);
 211                         pci_mmcfg_config_num = 0;
 212                         return -ENODEV;
 213                 }
 214         }
 215
 216         return 0;
 217 }
 218 #endif                          /* CONFIG_PCI_MMCONFIG */
 219
 220 #ifdef CONFIG_X86_LOCAL_APIC
 221 static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
 222 {
 223         struct acpi_table_madt *madt = NULL;
 224
 225         if (!phys_addr || !size || !cpu_has_apic)
 226                 return -EINVAL;
 227
 228         madt = (struct acpi_table_madt *)__acpi_map_table(phys_addr, size);
 229         if (!madt) {
 230                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
 231                 return -ENODEV;
 232         }
 233
 234         if (madt->lapic_address) {
 235                 acpi_lapic_addr = (u64) madt->lapic_address;
 236
 237                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
 238                        madt->lapic_address);
 239         }
 240
 241         acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
 242
 243         return 0;
 244 }
 245
 246 static int __init
 247 acpi_parse_lapic(acpi_table_entry_header * header, const unsigned long end)
 248 {
 249         struct acpi_table_lapic *processor = NULL;
 250
 251         processor = (struct acpi_table_lapic *)header;
 252
 253         if (BAD_MADT_ENTRY(processor, end))
 254                 return -EINVAL;
 255
 256         acpi_table_print_madt_entry(header);
 257
 258         /* Record local apic id only when enabled */
 259         if (processor->flags.enabled)
 260                 x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
 261
 262         /*
 263          * We need to register disabled CPU as well to permit
 264          * counting disabled CPUs. This allows us to size
 265          * cpus_possible_map more accurately, to permit
 266          * to not preallocating memory for all NR_CPUS
 267          * when we use CPU hotplug.
 268          */
 269         mp_register_lapic(processor->id,        /* APIC ID */
 270                           processor->flags.enabled);    /* Enabled? */
 271
 272         return 0;
 273 }
 274
 275 static int __init
 276 acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header,
 277                           const unsigned long end)
 278 {
 279         struct acpi_table_lapic_addr_ovr *lapic_addr_ovr = NULL;
 280
 281         lapic_addr_ovr = (struct acpi_table_lapic_addr_ovr *)header;
 282
 283         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
 284                 return -EINVAL;
 285
 286         acpi_lapic_addr = lapic_addr_ovr->address;
 287
 288         return 0;
 289 }
 290
 291 static int __init
 292 acpi_parse_lapic_nmi(acpi_table_entry_header * header, const unsigned long end)
 293 {
 294         struct acpi_table_lapic_nmi *lapic_nmi = NULL;
 295
 296         lapic_nmi = (struct acpi_table_lapic_nmi *)header;
 297
 298         if (BAD_MADT_ENTRY(lapic_nmi, end))
 299                 return -EINVAL;
 300
 301         acpi_table_print_madt_entry(header);
 302
 303         if (lapic_nmi->lint != 1)
 304                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
 305
 306         return 0;
 307 }
 308
 309 #endif                          /*CONFIG_X86_LOCAL_APIC */
 310
 311 #ifdef CONFIG_X86_IO_APIC
 312
 313 static int __init
 314 acpi_parse_ioapic(acpi_table_entry_header * header, const unsigned long end)
 315 {
 316         struct acpi_table_ioapic *ioapic = NULL;
 317
 318         ioapic = (struct acpi_table_ioapic *)header;
 319
 320         if (BAD_MADT_ENTRY(ioapic, end))
 321                 return -EINVAL;
 322
 323         acpi_table_print_madt_entry(header);
 324
 325         mp_register_ioapic(ioapic->id,
 326                            ioapic->address, ioapic->global_irq_base);
 327
 328         return 0;
 329 }
 330
 331 /*
 332  * Parse Interrupt Source Override for the ACPI SCI
 333  */
 334 static void acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
 335 {
 336         if (trigger == 0)       /* compatible SCI trigger is level */
 337                 trigger = 3;
 338
 339         if (polarity == 0)      /* compatible SCI polarity is low */
 340                 polarity = 3;
 341
 342         /* Command-line over-ride via acpi_sci= */
 343         if (acpi_sci_flags.trigger)
 344                 trigger = acpi_sci_flags.trigger;
 345
 346         if (acpi_sci_flags.polarity)
 347                 polarity = acpi_sci_flags.polarity;
 348
 349         /*
 350          * mp_config_acpi_legacy_irqs() already setup IRQs < 16
 351          * If GSI is < 16, this will update its flags,
 352          * else it will create a new mp_irqs[] entry.
 353          */
 354         mp_override_legacy_irq(gsi, polarity, trigger, gsi);
 355
 356         /*
 357          * stash over-ride to indicate we've been here
 358          * and for later update of acpi_fadt
 359          */
 360         acpi_sci_override_gsi = gsi;
 361         return;
 362 }
 363
 364 static int __init
 365 acpi_parse_int_src_ovr(acpi_table_entry_header * header,
 366                        const unsigned long end)
 367 {
 368         struct acpi_table_int_src_ovr *intsrc = NULL;
 369
 370         intsrc = (struct acpi_table_int_src_ovr *)header;
 371
 372         if (BAD_MADT_ENTRY(intsrc, end))
 373                 return -EINVAL;
 374
 375         acpi_table_print_madt_entry(header);
 376
 377         if (intsrc->bus_irq == acpi_fadt.sci_int) {
 378                 acpi_sci_ioapic_setup(intsrc->global_irq,
 379                                       intsrc->flags.polarity,
 380                                       intsrc->flags.trigger);
 381                 return 0;
 382         }
 383
 384         if (acpi_skip_timer_override &&
 385             intsrc->bus_irq == 0 && intsrc->global_irq == 2) {
 386                 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
 387                 return 0;
 388         }
 389
 390         mp_override_legacy_irq(intsrc->bus_irq,
 391                                intsrc->flags.polarity,
 392                                intsrc->flags.trigger, intsrc->global_irq);
 393
 394         return 0;
 395 }
 396
 397 static int __init
 398 acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
 399 {
 400         struct acpi_table_nmi_src *nmi_src = NULL;
 401
 402         nmi_src = (struct acpi_table_nmi_src *)header;
 403
 404         if (BAD_MADT_ENTRY(nmi_src, end))
 405                 return -EINVAL;
 406
 407         acpi_table_print_madt_entry(header);
 408
 409         /* TBD: Support nimsrc entries? */
 410
 411         return 0;
 412 }
 413
 414 #endif                          /* CONFIG_X86_IO_APIC */
 415
 416 /*
 417  * acpi_pic_sci_set_trigger()
 418  *
 419  * use ELCR to set PIC-mode trigger type for SCI
 420  *
 421  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 422  * it may require Edge Trigger -- use "acpi_sci=edge"
 423  *
 424  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 425  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 426  * ECLR1 is IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
 427  * ECLR2 is IRQ's 8-15 (IRQ 8, 13 must be 0)
 428  */
 429
 430 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
 431 {
 432         unsigned int mask = 1 << irq;
 433         unsigned int old, new;
 434
 435         /* Real old ELCR mask */
 436         old = inb(0x4d0) | (inb(0x4d1) << 8);
 437
 438         /*
 439          * If we use ACPI to set PCI irq's, then we should clear ELCR
 440          * since we will set it correctly as we enable the PCI irq
 441          * routing.
 442          */
 443         new = acpi_noirq ? old : 0;
 444
 445         /*
 446          * Update SCI information in the ELCR, it isn't in the PCI
 447          * routing tables..
 448          */
 449         switch (trigger) {
 450         case 1:         /* Edge - clear */
 451                 new &= ~mask;
 452                 break;
 453         case 3:         /* Level - set */
 454                 new |= mask;
 455                 break;
 456         }
 457
 458         if (old == new)
 459                 return;
 460
 461         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
 462         outb(new, 0x4d0);
 463         outb(new >> 8, 0x4d1);
 464 }
 465
 466 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 467 {
 468 #ifdef CONFIG_X86_IO_APIC
 469         if (use_pci_vector() && !platform_legacy_irq(gsi))
 470                 *irq = IO_APIC_VECTOR(gsi);
 471         else
 472 #endif
 473                 *irq = gsi_irq_sharing(gsi);
 474         return 0;
 475 }
 476
 477 /*
 478  * success: return IRQ number (>=0)
 479  * failure: return < 0
 480  */
 481 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 482 {
 483         unsigned int irq;
 484         unsigned int plat_gsi = gsi;
 485
 486 #ifdef CONFIG_PCI
 487         /*
 488          * Make sure all (legacy) PCI IRQs are set as level-triggered.
 489          */
 490         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
 491                 extern void eisa_set_level_irq(unsigned int irq);
 492
 493                 if (triggering == ACPI_LEVEL_SENSITIVE)
 494                         eisa_set_level_irq(gsi);
 495         }
 496 #endif
 497
 498 #ifdef CONFIG_X86_IO_APIC
 499         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
 500                 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
 501         }
 502 #endif
 503         acpi_gsi_to_irq(plat_gsi, &irq);
 504         return irq;
 505 }
 506
 507 EXPORT_SYMBOL(acpi_register_gsi);
 508
 509 /*
 510  *  ACPI based hotplug support for CPU
 511  */
 512 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 513 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 514 {
 515         /* TBD */
 516         return -EINVAL;
 517 }
 518
 519 EXPORT_SYMBOL(acpi_map_lsapic);
 520
 521 int acpi_unmap_lsapic(int cpu)
 522 {
 523         /* TBD */
 524         return -EINVAL;
 525 }
 526
 527 EXPORT_SYMBOL(acpi_unmap_lsapic);
 528 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 529
 530 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 531 {
 532         /* TBD */
 533         return -EINVAL;
 534 }
 535
 536 EXPORT_SYMBOL(acpi_register_ioapic);
 537
 538 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 539 {
 540         /* TBD */
 541         return -EINVAL;
 542 }
 543
 544 EXPORT_SYMBOL(acpi_unregister_ioapic);
 545
 546 static unsigned long __init
 547 acpi_scan_rsdp(unsigned long start, unsigned long length)
 548 {
 549         unsigned long offset = 0;
 550         unsigned long sig_len = sizeof("RSD PTR ") - 1;
 551
 552         /*
 553          * Scan all 16-byte boundaries of the physical memory region for the
 554          * RSDP signature.
 555          */
 556         for (offset = 0; offset < length; offset += 16) {
 557                 if (strncmp((char *)(phys_to_virt(start) + offset), "RSD PTR ", sig_len))
 558                         continue;
 559                 return (start + offset);
 560         }
 561
 562         return 0;
 563 }
 564
 565 static int __init acpi_parse_sbf(unsigned long phys_addr, unsigned long size)
 566 {
 567         struct acpi_table_sbf *sb;
 568
 569         if (!phys_addr || !size)
 570                 return -EINVAL;
 571
 572         sb = (struct acpi_table_sbf *)__acpi_map_table(phys_addr, size);
 573         if (!sb) {
 574                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
 575                 return -ENODEV;
 576         }
 577
 578         sbf_port = sb->sbf_cmos;        /* Save CMOS port */
 579
 580         return 0;
 581 }
 582
 583 #ifdef CONFIG_HPET_TIMER
 584
 585 static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
 586 {
 587         struct acpi_table_hpet *hpet_tbl;
 588
 589         if (!phys || !size)
 590                 return -EINVAL;
 591
 592         hpet_tbl = (struct acpi_table_hpet *)__acpi_map_table(phys, size);
 593         if (!hpet_tbl) {
 594                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
 595                 return -ENODEV;
 596         }
 597
 598         if (hpet_tbl->addr.space_id != ACPI_SPACE_MEM) {
 599                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 600                        "memory.\n");
 601                 return -1;
 602         }
 603 #ifdef  CONFIG_X86_64
 604         vxtime.hpet_address = hpet_tbl->addr.addrl |
 605             ((long)hpet_tbl->addr.addrh << 32);
 606
 607         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 608                hpet_tbl->id, vxtime.hpet_address);
 609 #else                           /* X86 */
 610         {
 611                 extern unsigned long hpet_address;
 612
 613                 hpet_address = hpet_tbl->addr.addrl;
 614                 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 615                        hpet_tbl->id, hpet_address);
 616         }
 617 #endif                          /* X86 */
 618
 619         return 0;
 620 }
 621 #else
 622 #define acpi_parse_hpet NULL
 623 #endif
 624
 625 #ifdef CONFIG_X86_PM_TIMER
 626 extern u32 pmtmr_ioport;
 627 #endif
 628
 629 static int __init acpi_parse_fadt(unsigned long phys, unsigned long size)
 630 {
 631         struct fadt_descriptor *fadt = NULL;
 632
 633         fadt = (struct fadt_descriptor *)__acpi_map_table(phys, size);
 634         if (!fadt) {
 635                 printk(KERN_WARNING PREFIX "Unable to map FADT\n");
 636                 return 0;
 637         }
 638         /* initialize sci_int early for INT_SRC_OVR MADT parsing */
 639         acpi_fadt.sci_int = fadt->sci_int;
 640
 641         /* initialize rev and apic_phys_dest_mode for x86_64 genapic */
 642         acpi_fadt.revision = fadt->revision;
 643         acpi_fadt.force_apic_physical_destination_mode =
 644             fadt->force_apic_physical_destination_mode;
 645
 646 #ifdef CONFIG_X86_PM_TIMER
 647         /* detect the location of the ACPI PM Timer */
 648         if (fadt->revision >= FADT2_REVISION_ID) {
 649                 /* FADT rev. 2 */
 650                 if (fadt->xpm_tmr_blk.address_space_id !=
 651                     ACPI_ADR_SPACE_SYSTEM_IO)
 652                         return 0;
 653
 654                 pmtmr_ioport = fadt->xpm_tmr_blk.address;
 655                 /*
 656                  * "X" fields are optional extensions to the original V1.0
 657                  * fields, so we must selectively expand V1.0 fields if the
 658                  * corresponding X field is zero.
 659                  */
 660                 if (!pmtmr_ioport)
 661                         pmtmr_ioport = fadt->V1_pm_tmr_blk;
 662         } else {
 663                 /* FADT rev. 1 */
 664                 pmtmr_ioport = fadt->V1_pm_tmr_blk;
 665         }
 666         if (pmtmr_ioport)
 667                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 668                        pmtmr_ioport);
 669 #endif
 670         return 0;
 671 }
 672
 673 unsigned long __init acpi_find_rsdp(void)
 674 {
 675         unsigned long rsdp_phys = 0;
 676
 677         if (efi_enabled) {
 678                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 679                         return efi.acpi20;
 680                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 681                         return efi.acpi;
 682         }
 683         /*
 684          * Scan memory looking for the RSDP signature. First search EBDA (low
 685          * memory) paragraphs and then search upper memory (E0000-FFFFF).
 686          */
 687         rsdp_phys = acpi_scan_rsdp(0, 0x400);
 688         if (!rsdp_phys)
 689                 rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);
 690
 691         return rsdp_phys;
 692 }
 693
 694 #ifdef  CONFIG_X86_LOCAL_APIC
 695 /*
 696  * Parse LAPIC entries in MADT
 697  * returns 0 on success, < 0 on error
 698  */
 699 static int __init acpi_parse_madt_lapic_entries(void)
 700 {
 701         int count;
 702
 703         if (!cpu_has_apic)
 704                 return -ENODEV;
 705
 706         /*
 707          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 708          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 709          */
 710
 711         count =
 712             acpi_table_parse_madt(ACPI_MADT_LAPIC_ADDR_OVR,
 713                                   acpi_parse_lapic_addr_ovr, 0);
 714         if (count < 0) {
 715                 printk(KERN_ERR PREFIX
 716                        "Error parsing LAPIC address override entry\n");
 717                 return count;
 718         }
 719
 720         mp_register_lapic_address(acpi_lapic_addr);
 721
 722         count = acpi_table_parse_madt(ACPI_MADT_LAPIC, acpi_parse_lapic,
 723                                       MAX_APICS);
 724         if (!count) {
 725                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 726                 /* TBD: Cleanup to allow fallback to MPS */
 727                 return -ENODEV;
 728         } else if (count < 0) {
 729                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 730                 /* TBD: Cleanup to allow fallback to MPS */
 731                 return count;
 732         }
 733
 734         count =
 735             acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0);
 736         if (count < 0) {
 737                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 738                 /* TBD: Cleanup to allow fallback to MPS */
 739                 return count;
 740         }
 741         return 0;
 742 }
 743 #endif                          /* CONFIG_X86_LOCAL_APIC */
 744
 745 #ifdef  CONFIG_X86_IO_APIC
 746 /*
 747  * Parse IOAPIC related entries in MADT
 748  * returns 0 on success, < 0 on error
 749  */
 750 static int __init acpi_parse_madt_ioapic_entries(void)
 751 {
 752         int count;
 753
 754         /*
 755          * ACPI interpreter is required to complete interrupt setup,
 756          * so if it is off, don't enumerate the io-apics with ACPI.
 757          * If MPS is present, it will handle them,
 758          * otherwise the system will stay in PIC mode
 759          */
 760         if (acpi_disabled || acpi_noirq) {
 761                 return -ENODEV;
 762         }
 763
 764         if (!cpu_has_apic)
 765                 return -ENODEV;
 766
 767         /*
 768          * if "noapic" boot option, don't look for IO-APICs
 769          */
 770         if (skip_ioapic_setup) {
 771                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 772                        "due to 'noapic' option.\n");
 773                 return -ENODEV;
 774         }
 775
 776         count =
 777             acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic,
 778                                   MAX_IO_APICS);
 779         if (!count) {
 780                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 781                 return -ENODEV;
 782         } else if (count < 0) {
 783                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 784                 return count;
 785         }
 786
 787         count =
 788             acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr,
 789                                   NR_IRQ_VECTORS);
 790         if (count < 0) {
 791                 printk(KERN_ERR PREFIX
 792                        "Error parsing interrupt source overrides entry\n");
 793                 /* TBD: Cleanup to allow fallback to MPS */
 794                 return count;
 795         }
 796
 797         /*
 798          * If BIOS did not supply an INT_SRC_OVR for the SCI
 799          * pretend we got one so we can set the SCI flags.
 800          */
 801         if (!acpi_sci_override_gsi)
 802                 acpi_sci_ioapic_setup(acpi_fadt.sci_int, 0, 0);
 803
 804         /* Fill in identity legacy mapings where no override */
 805         mp_config_acpi_legacy_irqs();
 806
 807         count =
 808             acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src,
 809                                   NR_IRQ_VECTORS);
 810         if (count < 0) {
 811                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 812                 /* TBD: Cleanup to allow fallback to MPS */
 813                 return count;
 814         }
 815
 816         return 0;
 817 }
 818 #else
 819 static inline int acpi_parse_madt_ioapic_entries(void)
 820 {
 821         return -1;
 822 }
 823 #endif  /* !CONFIG_X86_IO_APIC */
 824
 825 static void __init acpi_process_madt(void)
 826 {
 827 #ifdef CONFIG_X86_LOCAL_APIC
 828         int count, error;
 829
 830         count = acpi_table_parse(ACPI_APIC, acpi_parse_madt);
 831         if (count >= 1) {
 832
 833                 /*
 834                  * Parse MADT LAPIC entries
 835                  */
 836                 error = acpi_parse_madt_lapic_entries();
 837                 if (!error) {
 838                         acpi_lapic = 1;
 839
 840 #ifdef CONFIG_X86_GENERICARCH
 841                         generic_bigsmp_probe();
 842 #endif
 843                         /*
 844                          * Parse MADT IO-APIC entries
 845                          */
 846                         error = acpi_parse_madt_ioapic_entries();
 847                         if (!error) {
 848                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 849                                 acpi_irq_balance_set(NULL);
 850                                 acpi_ioapic = 1;
 851
 852                                 smp_found_config = 1;
 853                                 clustered_apic_check();
 854                         }
 855                 }
 856                 if (error == -EINVAL) {
 857                         /*
 858                          * Dell Precision Workstation 410, 610 come here.
 859                          */
 860                         printk(KERN_ERR PREFIX
 861                                "Invalid BIOS MADT, disabling ACPI\n");
 862                         disable_acpi();
 863                 }
 864         }
 865 #endif
 866         return;
 867 }
 868
 869 #ifdef __i386__
 870
 871 static int __init disable_acpi_irq(struct dmi_system_id *d)
 872 {
 873         if (!acpi_force) {
 874                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
 875                        d->ident);
 876                 acpi_noirq_set();
 877         }
 878         return 0;
 879 }
 880
 881 static int __init disable_acpi_pci(struct dmi_system_id *d)
 882 {
 883         if (!acpi_force) {
 884                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
 885                        d->ident);
 886                 acpi_disable_pci();
 887         }
 888         return 0;
 889 }
 890
 891 static int __init dmi_disable_acpi(struct dmi_system_id *d)
 892 {
 893         if (!acpi_force) {
 894                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
 895                 disable_acpi();
 896         } else {
 897                 printk(KERN_NOTICE
 898                        "Warning: DMI blacklist says broken, but acpi forced\n");
 899         }
 900         return 0;
 901 }
 902
 903 /*
 904  * Limit ACPI to CPU enumeration for HT
 905  */
 906 static int __init force_acpi_ht(struct dmi_system_id *d)
 907 {
 908         if (!acpi_force) {
 909                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
 910                        d->ident);
 911                 disable_acpi();
 912                 acpi_ht = 1;
 913         } else {
 914                 printk(KERN_NOTICE
 915                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
 916         }
 917         return 0;
 918 }
 919
 920 /*
 921  * If your system is blacklisted here, but you find that acpi=force
 922  * works for you, please contact acpi-devel@sourceforge.net
 923  */
 924 static struct dmi_system_id __initdata acpi_dmi_table[] = {
 925         /*
 926          * Boxes that need ACPI disabled
 927          */
 928         {
 929          .callback = dmi_disable_acpi,
 930          .ident = "IBM Thinkpad",
 931          .matches = {
 932                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
 933                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
 934                      },
 935          },
 936
 937         /*
 938          * Boxes that need acpi=ht
 939          */
 940         {
 941          .callback = force_acpi_ht,
 942          .ident = "FSC Primergy T850",
 943          .matches = {
 944                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 945                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
 946                      },
 947          },
 948         {
 949          .callback = force_acpi_ht,
 950          .ident = "DELL GX240",
 951          .matches = {
 952                      DMI_MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
 953                      DMI_MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
 954                      },
 955          },
 956         {
 957          .callback = force_acpi_ht,
 958          .ident = "HP VISUALIZE NT Workstation",
 959          .matches = {
 960                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 961                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
 962                      },
 963          },
 964         {
 965          .callback = force_acpi_ht,
 966          .ident = "Compaq Workstation W8000",
 967          .matches = {
 968                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
 969                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
 970                      },
 971          },
 972         {
 973          .callback = force_acpi_ht,
 974          .ident = "ASUS P4B266",
 975          .matches = {
 976                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 977                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
 978                      },
 979          },
 980         {
 981          .callback = force_acpi_ht,
 982          .ident = "ASUS P2B-DS",
 983          .matches = {
 984                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 985                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
 986                      },
 987          },
 988         {
 989          .callback = force_acpi_ht,
 990          .ident = "ASUS CUR-DLS",
 991          .matches = {
 992                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 993                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
 994                      },
 995          },
 996         {
 997          .callback = force_acpi_ht,
 998          .ident = "ABIT i440BX-W83977",
 999          .matches = {
1000                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1001                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1002                      },
1003          },
1004         {
1005          .callback = force_acpi_ht,
1006          .ident = "IBM Bladecenter",
1007          .matches = {
1008                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1009                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1010                      },
1011          },
1012         {
1013          .callback = force_acpi_ht,
1014          .ident = "IBM eServer xSeries 360",
1015          .matches = {
1016                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1017                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1018                      },
1019          },
1020         {
1021          .callback = force_acpi_ht,
1022          .ident = "IBM eserver xSeries 330",
1023          .matches = {
1024                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1025                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1026                      },
1027          },
1028         {
1029          .callback = force_acpi_ht,
1030          .ident = "IBM eserver xSeries 440",
1031          .matches = {
1032                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1033                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1034                      },
1035          },
1036
1037         /*
1038          * Boxes that need ACPI PCI IRQ routing disabled
1039          */
1040         {
1041          .callback = disable_acpi_irq,
1042          .ident = "ASUS A7V",
1043          .matches = {
1044                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1045                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1046                      /* newer BIOS, Revision 1011, does work */
1047                      DMI_MATCH(DMI_BIOS_VERSION,
1048                                "ASUS A7V ACPI BIOS Revision 1007"),
1049                      },
1050          },
1051
1052         /*
1053          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1054          */
1055         {                       /* _BBN 0 bug */
1056          .callback = disable_acpi_pci,
1057          .ident = "ASUS PR-DLS",
1058          .matches = {
1059                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1060                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1061                      DMI_MATCH(DMI_BIOS_VERSION,
1062                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1063                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1064                      },
1065          },
1066         {
1067          .callback = disable_acpi_pci,
1068          .ident = "Acer TravelMate 36x Laptop",
1069          .matches = {
1070                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1071                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1072                      },
1073          },
1074         {}
1075 };
1076
1077 #endif                          /* __i386__ */
1078
1079 /*
1080  * acpi_boot_table_init() and acpi_boot_init()
1081  *  called from setup_arch(), always.
1082  *      1. checksums all tables
1083  *      2. enumerates lapics
1084  *      3. enumerates io-apics
1085  *
1086  * acpi_table_init() is separate to allow reading SRAT without
1087  * other side effects.
1088  *
1089  * side effects of acpi_boot_init:
1090  *      acpi_lapic = 1 if LAPIC found
1091  *      acpi_ioapic = 1 if IOAPIC found
1092  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1093  *      if acpi_blacklisted() acpi_disabled = 1;
1094  *      acpi_irq_model=...
1095  *      ...
1096  *
1097  * return value: (currently ignored)
1098  *      0: success
1099  *      !0: failure
1100  */
1101
1102 int __init acpi_boot_table_init(void)
1103 {
1104         int error;
1105
1106 #ifdef __i386__
1107         dmi_check_system(acpi_dmi_table);
1108 #endif
1109
1110         /*
1111          * If acpi_disabled, bail out
1112          * One exception: acpi=ht continues far enough to enumerate LAPICs
1113          */
1114         if (acpi_disabled && !acpi_ht)
1115                 return 1;
1116
1117         /*
1118          * Initialize the ACPI boot-time table parser.
1119          */
1120         error = acpi_table_init();
1121         if (error) {
1122                 disable_acpi();
1123                 return error;
1124         }
1125
1126         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1127
1128         /*
1129          * blacklist may disable ACPI entirely
1130          */
1131         error = acpi_blacklisted();
1132         if (error) {
1133                 if (acpi_force) {
1134                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1135                 } else {
1136                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1137                         disable_acpi();
1138                         return error;
1139                 }
1140         }
1141
1142         return 0;
1143 }
1144
1145 int __init acpi_boot_init(void)
1146 {
1147         /*
1148          * If acpi_disabled, bail out
1149          * One exception: acpi=ht continues far enough to enumerate LAPICs
1150          */
1151         if (acpi_disabled && !acpi_ht)
1152                 return 1;
1153
1154         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1155
1156         /*
1157          * set sci_int and PM timer address
1158          */
1159         acpi_table_parse(ACPI_FADT, acpi_parse_fadt);
1160
1161         /*
1162          * Process the Multiple APIC Description Table (MADT), if present
1163          */
1164         acpi_process_madt();
1165
1166         acpi_table_parse(ACPI_HPET, acpi_parse_hpet);
1167
1168         return 0;
1169 }
1170
1171 static int __init parse_acpi(char *arg)
1172 {
1173         if (!arg)
1174                 return -EINVAL;
1175
1176         /* "acpi=off" disables both ACPI table parsing and interpreter */
1177         if (strcmp(arg, "off") == 0) {
1178                 disable_acpi();
1179         }
1180         /* acpi=force to over-ride black-list */
1181         else if (strcmp(arg, "force") == 0) {
1182                 acpi_force = 1;
1183                 acpi_ht = 1;
1184                 acpi_disabled = 0;
1185         }
1186         /* acpi=strict disables out-of-spec workarounds */
1187         else if (strcmp(arg, "strict") == 0) {
1188                 acpi_strict = 1;
1189         }
1190         /* Limit ACPI just to boot-time to enable HT */
1191         else if (strcmp(arg, "ht") == 0) {
1192                 if (!acpi_force)
1193                         disable_acpi();
1194                 acpi_ht = 1;
1195         }
1196         /* "acpi=noirq" disables ACPI interrupt routing */
1197         else if (strcmp(arg, "noirq") == 0) {
1198                 acpi_noirq_set();
1199         } else {
1200                 /* Core will printk when we return error. */
1201                 return -EINVAL;
1202         }
1203         return 0;
1204 }
1205 early_param("acpi", parse_acpi);
1206
1207 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1208 static int __init parse_pci(char *arg)
1209 {
1210         if (arg && strcmp(arg, "noacpi") == 0)
1211                 acpi_disable_pci();
1212         return 0;
1213 }
1214 early_param("pci", parse_pci);
1215
1216 #ifdef CONFIG_X86_IO_APIC
1217 static int __init parse_acpi_skip_timer_override(char *arg)
1218 {
1219         acpi_skip_timer_override = 1;
1220         return 0;
1221 }
1222 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1223 #endif /* CONFIG_X86_IO_APIC */
1224
1225 static int __init setup_acpi_sci(char *s)
1226 {
1227         if (!s)
1228                 return -EINVAL;
1229         if (!strcmp(s, "edge"))
1230                 acpi_sci_flags.trigger = 1;
1231         else if (!strcmp(s, "level"))
1232                 acpi_sci_flags.trigger = 3;
1233         else if (!strcmp(s, "high"))
1234                 acpi_sci_flags.polarity = 1;
1235         else if (!strcmp(s, "low"))
1236                 acpi_sci_flags.polarity = 3;
1237         else
1238                 return -EINVAL;
1239         return 0;
1240 }
1241 early_param("acpi_sci", setup_acpi_sci);