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/config.h>
  28 #include <linux/acpi.h>
  29 #include <linux/efi.h>
  30 #include <linux/module.h>
  31 #include <linux/dmi.h>
  32 #include <linux/irq.h>
  33
  34 #include <asm/pgtable.h>
  35 #include <asm/io_apic.h>
  36 #include <asm/apic.h>
  37 #include <asm/io.h>
  38 #include <asm/mpspec.h>
  39
  40 #ifdef  CONFIG_X86_64
  41
  42 static inline void acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  43 {
  44 }
  45 extern void __init clustered_apic_check(void);
  46 static inline int ioapic_setup_disabled(void)
  47 {
  48         return 0;
  49 }
  50
  51 #include <asm/proto.h>
  52
  53 #else                           /* X86 */
  54
  55 #ifdef  CONFIG_X86_LOCAL_APIC
  56 #include <mach_apic.h>
  57 #include <mach_mpparse.h>
  58 #endif                          /* CONFIG_X86_LOCAL_APIC */
  59
  60 #endif                          /* X86 */
  61
  62 #define BAD_MADT_ENTRY(entry, end) (                                        \
  63                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  64                 ((acpi_table_entry_header *)entry)->length != sizeof(*entry))
  65
  66 #define PREFIX                  "ACPI: "
  67
  68 int acpi_noirq __initdata;      /* skip ACPI IRQ initialization */
  69 int acpi_pci_disabled __initdata;       /* skip ACPI PCI scan and IRQ initialization */
  70 int acpi_ht __initdata = 1;     /* enable HT */
  71
  72 int acpi_lapic;
  73 int acpi_ioapic;
  74 int acpi_strict;
  75 EXPORT_SYMBOL(acpi_strict);
  76
  77 acpi_interrupt_flags acpi_sci_flags __initdata;
  78 int acpi_sci_override_gsi __initdata;
  79 int acpi_skip_timer_override __initdata;
  80
  81 #ifdef CONFIG_X86_LOCAL_APIC
  82 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  83 #endif
  84
  85 #ifndef __HAVE_ARCH_CMPXCHG
  86 #warning ACPI uses CMPXCHG, i486 and later hardware
  87 #endif
  88
  89 #define MAX_MADT_ENTRIES        256
  90 u8 x86_acpiid_to_apicid[MAX_MADT_ENTRIES] =
  91     {[0 ... MAX_MADT_ENTRIES - 1] = 0xff };
  92 EXPORT_SYMBOL(x86_acpiid_to_apicid);
  93
  94 /* --------------------------------------------------------------------------
  95                               Boot-time Configuration
  96    -------------------------------------------------------------------------- */
  97
  98 /*
  99  * The default interrupt routing model is PIC (8259).  This gets
 100  * overriden if IOAPICs are enumerated (below).
 101  */
 102 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
 103
 104 #ifdef  CONFIG_X86_64
 105
 106 /* rely on all ACPI tables being in the direct mapping */
 107 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 108 {
 109         if (!phys_addr || !size)
 110                 return NULL;
 111
 112         if (phys_addr < (end_pfn_map << PAGE_SHIFT))
 113                 return __va(phys_addr);
 114
 115         return NULL;
 116 }
 117
 118 #else
 119
 120 /*
 121  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
 122  * to map the target physical address. The problem is that set_fixmap()
 123  * provides a single page, and it is possible that the page is not
 124  * sufficient.
 125  * By using this area, we can map up to MAX_IO_APICS pages temporarily,
 126  * i.e. until the next __va_range() call.
 127  *
 128  * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
 129  * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
 130  * count idx down while incrementing the phys address.
 131  */
 132 char *__acpi_map_table(unsigned long phys, unsigned long size)
 133 {
 134         unsigned long base, offset, mapped_size;
 135         int idx;
 136
 137         if (phys + size < 8 * 1024 * 1024)
 138                 return __va(phys);
 139
 140         offset = phys & (PAGE_SIZE - 1);
 141         mapped_size = PAGE_SIZE - offset;
 142         set_fixmap(FIX_ACPI_END, phys);
 143         base = fix_to_virt(FIX_ACPI_END);
 144
 145         /*
 146          * Most cases can be covered by the below.
 147          */
 148         idx = FIX_ACPI_END;
 149         while (mapped_size < size) {
 150                 if (--idx < FIX_ACPI_BEGIN)
 151                         return NULL;    /* cannot handle this */
 152                 phys += PAGE_SIZE;
 153                 set_fixmap(idx, phys);
 154                 mapped_size += PAGE_SIZE;
 155         }
 156
 157         return ((unsigned char *)base + offset);
 158 }
 159 #endif
 160
 161 #ifdef CONFIG_PCI_MMCONFIG
 162 /* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
 163 struct acpi_table_mcfg_config *pci_mmcfg_config;
 164 int pci_mmcfg_config_num;
 165
 166 int __init acpi_parse_mcfg(unsigned long phys_addr, unsigned long size)
 167 {
 168         struct acpi_table_mcfg *mcfg;
 169         unsigned long i;
 170         int config_size;
 171
 172         if (!phys_addr || !size)
 173                 return -EINVAL;
 174
 175         mcfg = (struct acpi_table_mcfg *)__acpi_map_table(phys_addr, size);
 176         if (!mcfg) {
 177                 printk(KERN_WARNING PREFIX "Unable to map MCFG\n");
 178                 return -ENODEV;
 179         }
 180
 181         /* how many config structures do we have */
 182         pci_mmcfg_config_num = 0;
 183         i = size - sizeof(struct acpi_table_mcfg);
 184         while (i >= sizeof(struct acpi_table_mcfg_config)) {
 185                 ++pci_mmcfg_config_num;
 186                 i -= sizeof(struct acpi_table_mcfg_config);
 187         };
 188         if (pci_mmcfg_config_num == 0) {
 189                 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
 190                 return -ENODEV;
 191         }
 192
 193         config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
 194         pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
 195         if (!pci_mmcfg_config) {
 196                 printk(KERN_WARNING PREFIX
 197                        "No memory for MCFG config tables\n");
 198                 return -ENOMEM;
 199         }
 200
 201         memcpy(pci_mmcfg_config, &mcfg->config, config_size);
 202         for (i = 0; i < pci_mmcfg_config_num; ++i) {
 203                 if (mcfg->config[i].base_reserved) {
 204                         printk(KERN_ERR PREFIX
 205                                "MMCONFIG not in low 4GB of memory\n");
 206                         return -ENODEV;
 207                 }
 208         }
 209
 210         return 0;
 211 }
 212 #endif                          /* CONFIG_PCI_MMCONFIG */
 213
 214 #ifdef CONFIG_X86_LOCAL_APIC
 215 static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
 216 {
 217         struct acpi_table_madt *madt = NULL;
 218
 219         if (!phys_addr || !size)
 220                 return -EINVAL;
 221
 222         madt = (struct acpi_table_madt *)__acpi_map_table(phys_addr, size);
 223         if (!madt) {
 224                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
 225                 return -ENODEV;
 226         }
 227
 228         if (madt->lapic_address) {
 229                 acpi_lapic_addr = (u64) madt->lapic_address;
 230
 231                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
 232                        madt->lapic_address);
 233         }
 234
 235         acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
 236
 237         return 0;
 238 }
 239
 240 static int __init
 241 acpi_parse_lapic(acpi_table_entry_header * header, const unsigned long end)
 242 {
 243         struct acpi_table_lapic *processor = NULL;
 244
 245         processor = (struct acpi_table_lapic *)header;
 246
 247         if (BAD_MADT_ENTRY(processor, end))
 248                 return -EINVAL;
 249
 250         acpi_table_print_madt_entry(header);
 251
 252         /* no utility in registering a disabled processor */
 253         if (processor->flags.enabled == 0)
 254                 return 0;
 255
 256         x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
 257
 258         mp_register_lapic(processor->id,        /* APIC ID */
 259                           processor->flags.enabled);    /* Enabled? */
 260
 261         return 0;
 262 }
 263
 264 static int __init
 265 acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header,
 266                           const unsigned long end)
 267 {
 268         struct acpi_table_lapic_addr_ovr *lapic_addr_ovr = NULL;
 269
 270         lapic_addr_ovr = (struct acpi_table_lapic_addr_ovr *)header;
 271
 272         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
 273                 return -EINVAL;
 274
 275         acpi_lapic_addr = lapic_addr_ovr->address;
 276
 277         return 0;
 278 }
 279
 280 static int __init
 281 acpi_parse_lapic_nmi(acpi_table_entry_header * header, const unsigned long end)
 282 {
 283         struct acpi_table_lapic_nmi *lapic_nmi = NULL;
 284
 285         lapic_nmi = (struct acpi_table_lapic_nmi *)header;
 286
 287         if (BAD_MADT_ENTRY(lapic_nmi, end))
 288                 return -EINVAL;
 289
 290         acpi_table_print_madt_entry(header);
 291
 292         if (lapic_nmi->lint != 1)
 293                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
 294
 295         return 0;
 296 }
 297
 298 #endif                          /*CONFIG_X86_LOCAL_APIC */
 299
 300 #ifdef CONFIG_X86_IO_APIC
 301
 302 static int __init
 303 acpi_parse_ioapic(acpi_table_entry_header * header, const unsigned long end)
 304 {
 305         struct acpi_table_ioapic *ioapic = NULL;
 306
 307         ioapic = (struct acpi_table_ioapic *)header;
 308
 309         if (BAD_MADT_ENTRY(ioapic, end))
 310                 return -EINVAL;
 311
 312         acpi_table_print_madt_entry(header);
 313
 314         mp_register_ioapic(ioapic->id,
 315                            ioapic->address, ioapic->global_irq_base);
 316
 317         return 0;
 318 }
 319
 320 /*
 321  * Parse Interrupt Source Override for the ACPI SCI
 322  */
 323 static void acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
 324 {
 325         if (trigger == 0)       /* compatible SCI trigger is level */
 326                 trigger = 3;
 327
 328         if (polarity == 0)      /* compatible SCI polarity is low */
 329                 polarity = 3;
 330
 331         /* Command-line over-ride via acpi_sci= */
 332         if (acpi_sci_flags.trigger)
 333                 trigger = acpi_sci_flags.trigger;
 334
 335         if (acpi_sci_flags.polarity)
 336                 polarity = acpi_sci_flags.polarity;
 337
 338         /*
 339          * mp_config_acpi_legacy_irqs() already setup IRQs < 16
 340          * If GSI is < 16, this will update its flags,
 341          * else it will create a new mp_irqs[] entry.
 342          */
 343         mp_override_legacy_irq(gsi, polarity, trigger, gsi);
 344
 345         /*
 346          * stash over-ride to indicate we've been here
 347          * and for later update of acpi_fadt
 348          */
 349         acpi_sci_override_gsi = gsi;
 350         return;
 351 }
 352
 353 static int __init
 354 acpi_parse_int_src_ovr(acpi_table_entry_header * header,
 355                        const unsigned long end)
 356 {
 357         struct acpi_table_int_src_ovr *intsrc = NULL;
 358
 359         intsrc = (struct acpi_table_int_src_ovr *)header;
 360
 361         if (BAD_MADT_ENTRY(intsrc, end))
 362                 return -EINVAL;
 363
 364         acpi_table_print_madt_entry(header);
 365
 366         if (intsrc->bus_irq == acpi_fadt.sci_int) {
 367                 acpi_sci_ioapic_setup(intsrc->global_irq,
 368                                       intsrc->flags.polarity,
 369                                       intsrc->flags.trigger);
 370                 return 0;
 371         }
 372
 373         if (acpi_skip_timer_override &&
 374             intsrc->bus_irq == 0 && intsrc->global_irq == 2) {
 375                 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
 376                 return 0;
 377         }
 378
 379         mp_override_legacy_irq(intsrc->bus_irq,
 380                                intsrc->flags.polarity,
 381                                intsrc->flags.trigger, intsrc->global_irq);
 382
 383         return 0;
 384 }
 385
 386 static int __init
 387 acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
 388 {
 389         struct acpi_table_nmi_src *nmi_src = NULL;
 390
 391         nmi_src = (struct acpi_table_nmi_src *)header;
 392
 393         if (BAD_MADT_ENTRY(nmi_src, end))
 394                 return -EINVAL;
 395
 396         acpi_table_print_madt_entry(header);
 397
 398         /* TBD: Support nimsrc entries? */
 399
 400         return 0;
 401 }
 402
 403 #endif                          /* CONFIG_X86_IO_APIC */
 404
 405 /*
 406  * acpi_pic_sci_set_trigger()
 407  *
 408  * use ELCR to set PIC-mode trigger type for SCI
 409  *
 410  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 411  * it may require Edge Trigger -- use "acpi_sci=edge"
 412  *
 413  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 414  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 415  * ECLR1 is IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
 416  * ECLR2 is IRQ's 8-15 (IRQ 8, 13 must be 0)
 417  */
 418
 419 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
 420 {
 421         unsigned int mask = 1 << irq;
 422         unsigned int old, new;
 423
 424         /* Real old ELCR mask */
 425         old = inb(0x4d0) | (inb(0x4d1) << 8);
 426
 427         /*
 428          * If we use ACPI to set PCI irq's, then we should clear ELCR
 429          * since we will set it correctly as we enable the PCI irq
 430          * routing.
 431          */
 432         new = acpi_noirq ? old : 0;
 433
 434         /*
 435          * Update SCI information in the ELCR, it isn't in the PCI
 436          * routing tables..
 437          */
 438         switch (trigger) {
 439         case 1:         /* Edge - clear */
 440                 new &= ~mask;
 441                 break;
 442         case 3:         /* Level - set */
 443                 new |= mask;
 444                 break;
 445         }
 446
 447         if (old == new)
 448                 return;
 449
 450         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
 451         outb(new, 0x4d0);
 452         outb(new >> 8, 0x4d1);
 453 }
 454
 455 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 456 {
 457 #ifdef CONFIG_X86_IO_APIC
 458         if (use_pci_vector() && !platform_legacy_irq(gsi))
 459                 *irq = IO_APIC_VECTOR(gsi);
 460         else
 461 #endif
 462                 *irq = gsi;
 463         return 0;
 464 }
 465
 466 /*
 467  * success: return IRQ number (>=0)
 468  * failure: return < 0
 469  */
 470 int acpi_register_gsi(u32 gsi, int edge_level, int active_high_low)
 471 {
 472         unsigned int irq;
 473         unsigned int plat_gsi = gsi;
 474
 475 #ifdef CONFIG_PCI
 476         /*
 477          * Make sure all (legacy) PCI IRQs are set as level-triggered.
 478          */
 479         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
 480                 extern void eisa_set_level_irq(unsigned int irq);
 481
 482                 if (edge_level == ACPI_LEVEL_SENSITIVE)
 483                         eisa_set_level_irq(gsi);
 484         }
 485 #endif
 486
 487 #ifdef CONFIG_X86_IO_APIC
 488         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
 489                 plat_gsi = mp_register_gsi(gsi, edge_level, active_high_low);
 490         }
 491 #endif
 492         acpi_gsi_to_irq(plat_gsi, &irq);
 493         return irq;
 494 }
 495
 496 EXPORT_SYMBOL(acpi_register_gsi);
 497
 498 /*
 499  *  ACPI based hotplug support for CPU
 500  */
 501 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 502 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 503 {
 504         /* TBD */
 505         return -EINVAL;
 506 }
 507
 508 EXPORT_SYMBOL(acpi_map_lsapic);
 509
 510 int acpi_unmap_lsapic(int cpu)
 511 {
 512         /* TBD */
 513         return -EINVAL;
 514 }
 515
 516 EXPORT_SYMBOL(acpi_unmap_lsapic);
 517 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 518
 519 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 520 {
 521         /* TBD */
 522         return -EINVAL;
 523 }
 524
 525 EXPORT_SYMBOL(acpi_register_ioapic);
 526
 527 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 528 {
 529         /* TBD */
 530         return -EINVAL;
 531 }
 532
 533 EXPORT_SYMBOL(acpi_unregister_ioapic);
 534
 535 static unsigned long __init
 536 acpi_scan_rsdp(unsigned long start, unsigned long length)
 537 {
 538         unsigned long offset = 0;
 539         unsigned long sig_len = sizeof("RSD PTR ") - 1;
 540
 541         /*
 542          * Scan all 16-byte boundaries of the physical memory region for the
 543          * RSDP signature.
 544          */
 545         for (offset = 0; offset < length; offset += 16) {
 546                 if (strncmp((char *)(start + offset), "RSD PTR ", sig_len))
 547                         continue;
 548                 return (start + offset);
 549         }
 550
 551         return 0;
 552 }
 553
 554 static int __init acpi_parse_sbf(unsigned long phys_addr, unsigned long size)
 555 {
 556         struct acpi_table_sbf *sb;
 557
 558         if (!phys_addr || !size)
 559                 return -EINVAL;
 560
 561         sb = (struct acpi_table_sbf *)__acpi_map_table(phys_addr, size);
 562         if (!sb) {
 563                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
 564                 return -ENODEV;
 565         }
 566
 567         sbf_port = sb->sbf_cmos;        /* Save CMOS port */
 568
 569         return 0;
 570 }
 571
 572 #ifdef CONFIG_HPET_TIMER
 573
 574 static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
 575 {
 576         struct acpi_table_hpet *hpet_tbl;
 577
 578         if (!phys || !size)
 579                 return -EINVAL;
 580
 581         hpet_tbl = (struct acpi_table_hpet *)__acpi_map_table(phys, size);
 582         if (!hpet_tbl) {
 583                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
 584                 return -ENODEV;
 585         }
 586
 587         if (hpet_tbl->addr.space_id != ACPI_SPACE_MEM) {
 588                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 589                        "memory.\n");
 590                 return -1;
 591         }
 592 #ifdef  CONFIG_X86_64
 593         vxtime.hpet_address = hpet_tbl->addr.addrl |
 594             ((long)hpet_tbl->addr.addrh << 32);
 595
 596         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 597                hpet_tbl->id, vxtime.hpet_address);
 598 #else                           /* X86 */
 599         {
 600                 extern unsigned long hpet_address;
 601
 602                 hpet_address = hpet_tbl->addr.addrl;
 603                 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 604                        hpet_tbl->id, hpet_address);
 605         }
 606 #endif                          /* X86 */
 607
 608         return 0;
 609 }
 610 #else
 611 #define acpi_parse_hpet NULL
 612 #endif
 613
 614 #ifdef CONFIG_X86_PM_TIMER
 615 extern u32 pmtmr_ioport;
 616 #endif
 617
 618 static int __init acpi_parse_fadt(unsigned long phys, unsigned long size)
 619 {
 620         struct fadt_descriptor_rev2 *fadt = NULL;
 621
 622         fadt = (struct fadt_descriptor_rev2 *)__acpi_map_table(phys, size);
 623         if (!fadt) {
 624                 printk(KERN_WARNING PREFIX "Unable to map FADT\n");
 625                 return 0;
 626         }
 627         /* initialize sci_int early for INT_SRC_OVR MADT parsing */
 628         acpi_fadt.sci_int = fadt->sci_int;
 629
 630         /* initialize rev and apic_phys_dest_mode for x86_64 genapic */
 631         acpi_fadt.revision = fadt->revision;
 632         acpi_fadt.force_apic_physical_destination_mode =
 633             fadt->force_apic_physical_destination_mode;
 634
 635 #ifdef CONFIG_X86_PM_TIMER
 636         /* detect the location of the ACPI PM Timer */
 637         if (fadt->revision >= FADT2_REVISION_ID) {
 638                 /* FADT rev. 2 */
 639                 if (fadt->xpm_tmr_blk.address_space_id !=
 640                     ACPI_ADR_SPACE_SYSTEM_IO)
 641                         return 0;
 642
 643                 pmtmr_ioport = fadt->xpm_tmr_blk.address;
 644         } else {
 645                 /* FADT rev. 1 */
 646                 pmtmr_ioport = fadt->V1_pm_tmr_blk;
 647         }
 648         if (pmtmr_ioport)
 649                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 650                        pmtmr_ioport);
 651 #endif
 652         return 0;
 653 }
 654
 655 unsigned long __init acpi_find_rsdp(void)
 656 {
 657         unsigned long rsdp_phys = 0;
 658
 659         if (efi_enabled) {
 660                 if (efi.acpi20)
 661                         return __pa(efi.acpi20);
 662                 else if (efi.acpi)
 663                         return __pa(efi.acpi);
 664         }
 665         /*
 666          * Scan memory looking for the RSDP signature. First search EBDA (low
 667          * memory) paragraphs and then search upper memory (E0000-FFFFF).
 668          */
 669         rsdp_phys = acpi_scan_rsdp(0, 0x400);
 670         if (!rsdp_phys)
 671                 rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);
 672
 673         return rsdp_phys;
 674 }
 675
 676 #ifdef  CONFIG_X86_LOCAL_APIC
 677 /*
 678  * Parse LAPIC entries in MADT
 679  * returns 0 on success, < 0 on error
 680  */
 681 static int __init acpi_parse_madt_lapic_entries(void)
 682 {
 683         int count;
 684
 685         /*
 686          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 687          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 688          */
 689
 690         count =
 691             acpi_table_parse_madt(ACPI_MADT_LAPIC_ADDR_OVR,
 692                                   acpi_parse_lapic_addr_ovr, 0);
 693         if (count < 0) {
 694                 printk(KERN_ERR PREFIX
 695                        "Error parsing LAPIC address override entry\n");
 696                 return count;
 697         }
 698
 699         mp_register_lapic_address(acpi_lapic_addr);
 700
 701         count = acpi_table_parse_madt(ACPI_MADT_LAPIC, acpi_parse_lapic,
 702                                       MAX_APICS);
 703         if (!count) {
 704                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 705                 /* TBD: Cleanup to allow fallback to MPS */
 706                 return -ENODEV;
 707         } else if (count < 0) {
 708                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 709                 /* TBD: Cleanup to allow fallback to MPS */
 710                 return count;
 711         }
 712
 713         count =
 714             acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0);
 715         if (count < 0) {
 716                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 717                 /* TBD: Cleanup to allow fallback to MPS */
 718                 return count;
 719         }
 720         return 0;
 721 }
 722 #endif                          /* CONFIG_X86_LOCAL_APIC */
 723
 724 #ifdef  CONFIG_X86_IO_APIC
 725 /*
 726  * Parse IOAPIC related entries in MADT
 727  * returns 0 on success, < 0 on error
 728  */
 729 static int __init acpi_parse_madt_ioapic_entries(void)
 730 {
 731         int count;
 732
 733         /*
 734          * ACPI interpreter is required to complete interrupt setup,
 735          * so if it is off, don't enumerate the io-apics with ACPI.
 736          * If MPS is present, it will handle them,
 737          * otherwise the system will stay in PIC mode
 738          */
 739         if (acpi_disabled || acpi_noirq) {
 740                 return -ENODEV;
 741         }
 742
 743         /*
 744          * if "noapic" boot option, don't look for IO-APICs
 745          */
 746         if (skip_ioapic_setup) {
 747                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 748                        "due to 'noapic' option.\n");
 749                 return -ENODEV;
 750         }
 751
 752         count =
 753             acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic,
 754                                   MAX_IO_APICS);
 755         if (!count) {
 756                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 757                 return -ENODEV;
 758         } else if (count < 0) {
 759                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 760                 return count;
 761         }
 762
 763         count =
 764             acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr,
 765                                   NR_IRQ_VECTORS);
 766         if (count < 0) {
 767                 printk(KERN_ERR PREFIX
 768                        "Error parsing interrupt source overrides entry\n");
 769                 /* TBD: Cleanup to allow fallback to MPS */
 770                 return count;
 771         }
 772
 773         /*
 774          * If BIOS did not supply an INT_SRC_OVR for the SCI
 775          * pretend we got one so we can set the SCI flags.
 776          */
 777         if (!acpi_sci_override_gsi)
 778                 acpi_sci_ioapic_setup(acpi_fadt.sci_int, 0, 0);
 779
 780         /* Fill in identity legacy mapings where no override */
 781         mp_config_acpi_legacy_irqs();
 782
 783         count =
 784             acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src,
 785                                   NR_IRQ_VECTORS);
 786         if (count < 0) {
 787                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 788                 /* TBD: Cleanup to allow fallback to MPS */
 789                 return count;
 790         }
 791
 792         return 0;
 793 }
 794 #else
 795 static inline int acpi_parse_madt_ioapic_entries(void)
 796 {
 797         return -1;
 798 }
 799 #endif  /* !CONFIG_X86_IO_APIC */
 800
 801 static void __init acpi_process_madt(void)
 802 {
 803 #ifdef CONFIG_X86_LOCAL_APIC
 804         int count, error;
 805
 806         count = acpi_table_parse(ACPI_APIC, acpi_parse_madt);
 807         if (count >= 1) {
 808
 809                 /*
 810                  * Parse MADT LAPIC entries
 811                  */
 812                 error = acpi_parse_madt_lapic_entries();
 813                 if (!error) {
 814                         acpi_lapic = 1;
 815
 816 #ifdef CONFIG_X86_GENERICARCH
 817                         generic_bigsmp_probe();
 818 #endif
 819                         /*
 820                          * Parse MADT IO-APIC entries
 821                          */
 822                         error = acpi_parse_madt_ioapic_entries();
 823                         if (!error) {
 824                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 825                                 acpi_irq_balance_set(NULL);
 826                                 acpi_ioapic = 1;
 827
 828                                 smp_found_config = 1;
 829                                 clustered_apic_check();
 830                         }
 831                 }
 832                 if (error == -EINVAL) {
 833                         /*
 834                          * Dell Precision Workstation 410, 610 come here.
 835                          */
 836                         printk(KERN_ERR PREFIX
 837                                "Invalid BIOS MADT, disabling ACPI\n");
 838                         disable_acpi();
 839                 }
 840         }
 841 #endif
 842         return;
 843 }
 844
 845 extern int acpi_force;
 846
 847 #ifdef __i386__
 848
 849 static int __init disable_acpi_irq(struct dmi_system_id *d)
 850 {
 851         if (!acpi_force) {
 852                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
 853                        d->ident);
 854                 acpi_noirq_set();
 855         }
 856         return 0;
 857 }
 858
 859 static int __init disable_acpi_pci(struct dmi_system_id *d)
 860 {
 861         if (!acpi_force) {
 862                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
 863                        d->ident);
 864                 acpi_disable_pci();
 865         }
 866         return 0;
 867 }
 868
 869 static int __init dmi_disable_acpi(struct dmi_system_id *d)
 870 {
 871         if (!acpi_force) {
 872                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
 873                 disable_acpi();
 874         } else {
 875                 printk(KERN_NOTICE
 876                        "Warning: DMI blacklist says broken, but acpi forced\n");
 877         }
 878         return 0;
 879 }
 880
 881 /*
 882  * Limit ACPI to CPU enumeration for HT
 883  */
 884 static int __init force_acpi_ht(struct dmi_system_id *d)
 885 {
 886         if (!acpi_force) {
 887                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
 888                        d->ident);
 889                 disable_acpi();
 890                 acpi_ht = 1;
 891         } else {
 892                 printk(KERN_NOTICE
 893                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
 894         }
 895         return 0;
 896 }
 897
 898 /*
 899  * If your system is blacklisted here, but you find that acpi=force
 900  * works for you, please contact acpi-devel@sourceforge.net
 901  */
 902 static struct dmi_system_id __initdata acpi_dmi_table[] = {
 903         /*
 904          * Boxes that need ACPI disabled
 905          */
 906         {
 907          .callback = dmi_disable_acpi,
 908          .ident = "IBM Thinkpad",
 909          .matches = {
 910                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
 911                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
 912                      },
 913          },
 914
 915         /*
 916          * Boxes that need acpi=ht
 917          */
 918         {
 919          .callback = force_acpi_ht,
 920          .ident = "FSC Primergy T850",
 921          .matches = {
 922                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 923                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
 924                      },
 925          },
 926         {
 927          .callback = force_acpi_ht,
 928          .ident = "DELL GX240",
 929          .matches = {
 930                      DMI_MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
 931                      DMI_MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
 932                      },
 933          },
 934         {
 935          .callback = force_acpi_ht,
 936          .ident = "HP VISUALIZE NT Workstation",
 937          .matches = {
 938                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 939                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
 940                      },
 941          },
 942         {
 943          .callback = force_acpi_ht,
 944          .ident = "Compaq Workstation W8000",
 945          .matches = {
 946                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
 947                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
 948                      },
 949          },
 950         {
 951          .callback = force_acpi_ht,
 952          .ident = "ASUS P4B266",
 953          .matches = {
 954                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 955                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
 956                      },
 957          },
 958         {
 959          .callback = force_acpi_ht,
 960          .ident = "ASUS P2B-DS",
 961          .matches = {
 962                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 963                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
 964                      },
 965          },
 966         {
 967          .callback = force_acpi_ht,
 968          .ident = "ASUS CUR-DLS",
 969          .matches = {
 970                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 971                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
 972                      },
 973          },
 974         {
 975          .callback = force_acpi_ht,
 976          .ident = "ABIT i440BX-W83977",
 977          .matches = {
 978                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
 979                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
 980                      },
 981          },
 982         {
 983          .callback = force_acpi_ht,
 984          .ident = "IBM Bladecenter",
 985          .matches = {
 986                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
 987                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
 988                      },
 989          },
 990         {
 991          .callback = force_acpi_ht,
 992          .ident = "IBM eServer xSeries 360",
 993          .matches = {
 994                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
 995                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
 996                      },
 997          },
 998         {
 999          .callback = force_acpi_ht,
1000          .ident = "IBM eserver xSeries 330",
1001          .matches = {
1002                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1003                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1004                      },
1005          },
1006         {
1007          .callback = force_acpi_ht,
1008          .ident = "IBM eserver xSeries 440",
1009          .matches = {
1010                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1011                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1012                      },
1013          },
1014
1015         /*
1016          * Boxes that need ACPI PCI IRQ routing disabled
1017          */
1018         {
1019          .callback = disable_acpi_irq,
1020          .ident = "ASUS A7V",
1021          .matches = {
1022                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1023                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1024                      /* newer BIOS, Revision 1011, does work */
1025                      DMI_MATCH(DMI_BIOS_VERSION,
1026                                "ASUS A7V ACPI BIOS Revision 1007"),
1027                      },
1028          },
1029
1030         /*
1031          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1032          */
1033         {                       /* _BBN 0 bug */
1034          .callback = disable_acpi_pci,
1035          .ident = "ASUS PR-DLS",
1036          .matches = {
1037                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1038                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1039                      DMI_MATCH(DMI_BIOS_VERSION,
1040                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1041                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1042                      },
1043          },
1044         {
1045          .callback = disable_acpi_pci,
1046          .ident = "Acer TravelMate 36x Laptop",
1047          .matches = {
1048                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1049                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1050                      },
1051          },
1052         {}
1053 };
1054
1055 #endif                          /* __i386__ */
1056
1057 /*
1058  * acpi_boot_table_init() and acpi_boot_init()
1059  *  called from setup_arch(), always.
1060  *      1. checksums all tables
1061  *      2. enumerates lapics
1062  *      3. enumerates io-apics
1063  *
1064  * acpi_table_init() is separate to allow reading SRAT without
1065  * other side effects.
1066  *
1067  * side effects of acpi_boot_init:
1068  *      acpi_lapic = 1 if LAPIC found
1069  *      acpi_ioapic = 1 if IOAPIC found
1070  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1071  *      if acpi_blacklisted() acpi_disabled = 1;
1072  *      acpi_irq_model=...
1073  *      ...
1074  *
1075  * return value: (currently ignored)
1076  *      0: success
1077  *      !0: failure
1078  */
1079
1080 int __init acpi_boot_table_init(void)
1081 {
1082         int error;
1083
1084 #ifdef __i386__
1085         dmi_check_system(acpi_dmi_table);
1086 #endif
1087
1088         /*
1089          * If acpi_disabled, bail out
1090          * One exception: acpi=ht continues far enough to enumerate LAPICs
1091          */
1092         if (acpi_disabled && !acpi_ht)
1093                 return 1;
1094
1095         /*
1096          * Initialize the ACPI boot-time table parser.
1097          */
1098         error = acpi_table_init();
1099         if (error) {
1100                 disable_acpi();
1101                 return error;
1102         }
1103 #ifdef __i386__
1104         check_acpi_pci();
1105 #endif
1106
1107         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1108
1109         /*
1110          * blacklist may disable ACPI entirely
1111          */
1112         error = acpi_blacklisted();
1113         if (error) {
1114                 if (acpi_force) {
1115                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1116                 } else {
1117                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1118                         disable_acpi();
1119                         return error;
1120                 }
1121         }
1122
1123         return 0;
1124 }
1125
1126 int __init acpi_boot_init(void)
1127 {
1128         /*
1129          * If acpi_disabled, bail out
1130          * One exception: acpi=ht continues far enough to enumerate LAPICs
1131          */
1132         if (acpi_disabled && !acpi_ht)
1133                 return 1;
1134
1135         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1136
1137         /*
1138          * set sci_int and PM timer address
1139          */
1140         acpi_table_parse(ACPI_FADT, acpi_parse_fadt);
1141
1142         /*
1143          * Process the Multiple APIC Description Table (MADT), if present
1144          */
1145         acpi_process_madt();
1146
1147         acpi_table_parse(ACPI_HPET, acpi_parse_hpet);
1148
1149         return 0;
1150 }