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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/config.h>
  28 #include <linux/acpi.h>
  29 #include <linux/efi.h>
  30 #include <linux/irq.h>
  31 #include <linux/module.h>
  32 #include <linux/dmi.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/irq.h>
  39 #include <asm/mpspec.h>
  40
  41 #ifdef  CONFIG_X86_64
  42
  43 static inline void acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  44 {
  45 }
  46 extern void __init clustered_apic_check(void);
  47 static inline int ioapic_setup_disabled(void)
  48 {
  49         return 0;
  50 }
  51
  52 #include <asm/proto.h>
  53
  54 #else                           /* X86 */
  55
  56 #ifdef  CONFIG_X86_LOCAL_APIC
  57 #include <mach_apic.h>
  58 #include <mach_mpparse.h>
  59 #endif                          /* CONFIG_X86_LOCAL_APIC */
  60
  61 #endif                          /* X86 */
  62
  63 #define BAD_MADT_ENTRY(entry, end) (                                        \
  64                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  65                 ((acpi_table_entry_header *)entry)->length != sizeof(*entry))
  66
  67 #define PREFIX                  "ACPI: "
  68
  69 int acpi_noirq __initdata;      /* skip ACPI IRQ initialization */
  70 int acpi_pci_disabled __initdata;       /* skip ACPI PCI scan and IRQ initialization */
  71 int acpi_ht __initdata = 1;     /* enable HT */
  72
  73 int acpi_lapic;
  74 int acpi_ioapic;
  75 int acpi_strict;
  76 EXPORT_SYMBOL(acpi_strict);
  77
  78 acpi_interrupt_flags acpi_sci_flags __initdata;
  79 int acpi_sci_override_gsi __initdata;
  80 int acpi_skip_timer_override __initdata;
  81
  82 #ifdef CONFIG_X86_LOCAL_APIC
  83 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  84 #endif
  85
  86 #ifndef __HAVE_ARCH_CMPXCHG
  87 #warning ACPI uses CMPXCHG, i486 and later hardware
  88 #endif
  89
  90 #define MAX_MADT_ENTRIES        256
  91 u8 x86_acpiid_to_apicid[MAX_MADT_ENTRIES] =
  92     {[0 ... MAX_MADT_ENTRIES - 1] = 0xff };
  93 EXPORT_SYMBOL(x86_acpiid_to_apicid);
  94
  95 /* --------------------------------------------------------------------------
  96                               Boot-time Configuration
  97    -------------------------------------------------------------------------- */
  98
  99 /*
 100  * The default interrupt routing model is PIC (8259).  This gets
 101  * overriden if IOAPICs are enumerated (below).
 102  */
 103 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
 104
 105 #ifdef  CONFIG_X86_64
 106
 107 /* rely on all ACPI tables being in the direct mapping */
 108 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 109 {
 110         if (!phys_addr || !size)
 111                 return NULL;
 112
 113         if (phys_addr < (end_pfn_map << PAGE_SHIFT))
 114                 return __va(phys_addr);
 115
 116         return NULL;
 117 }
 118
 119 #else
 120
 121 /*
 122  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
 123  * to map the target physical address. The problem is that set_fixmap()
 124  * provides a single page, and it is possible that the page is not
 125  * sufficient.
 126  * By using this area, we can map up to MAX_IO_APICS pages temporarily,
 127  * i.e. until the next __va_range() call.
 128  *
 129  * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
 130  * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
 131  * count idx down while incrementing the phys address.
 132  */
 133 char *__acpi_map_table(unsigned long phys, unsigned long size)
 134 {
 135         unsigned long base, offset, mapped_size;
 136         int idx;
 137
 138         if (phys + size < 8 * 1024 * 1024)
 139                 return __va(phys);
 140
 141         offset = phys & (PAGE_SIZE - 1);
 142         mapped_size = PAGE_SIZE - offset;
 143         set_fixmap(FIX_ACPI_END, phys);
 144         base = fix_to_virt(FIX_ACPI_END);
 145
 146         /*
 147          * Most cases can be covered by the below.
 148          */
 149         idx = FIX_ACPI_END;
 150         while (mapped_size < size) {
 151                 if (--idx < FIX_ACPI_BEGIN)
 152                         return NULL;    /* cannot handle this */
 153                 phys += PAGE_SIZE;
 154                 set_fixmap(idx, phys);
 155                 mapped_size += PAGE_SIZE;
 156         }
 157
 158         return ((unsigned char *)base + offset);
 159 }
 160 #endif
 161
 162 #ifdef CONFIG_PCI_MMCONFIG
 163 /* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
 164 struct acpi_table_mcfg_config *pci_mmcfg_config;
 165 int pci_mmcfg_config_num;
 166
 167 int __init acpi_parse_mcfg(unsigned long phys_addr, unsigned long size)
 168 {
 169         struct acpi_table_mcfg *mcfg;
 170         unsigned long i;
 171         int config_size;
 172
 173         if (!phys_addr || !size)
 174                 return -EINVAL;
 175
 176         mcfg = (struct acpi_table_mcfg *)__acpi_map_table(phys_addr, size);
 177         if (!mcfg) {
 178                 printk(KERN_WARNING PREFIX "Unable to map MCFG\n");
 179                 return -ENODEV;
 180         }
 181
 182         /* how many config structures do we have */
 183         pci_mmcfg_config_num = 0;
 184         i = size - sizeof(struct acpi_table_mcfg);
 185         while (i >= sizeof(struct acpi_table_mcfg_config)) {
 186                 ++pci_mmcfg_config_num;
 187                 i -= sizeof(struct acpi_table_mcfg_config);
 188         };
 189         if (pci_mmcfg_config_num == 0) {
 190                 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
 191                 return -ENODEV;
 192         }
 193
 194         config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
 195         pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
 196         if (!pci_mmcfg_config) {
 197                 printk(KERN_WARNING PREFIX
 198                        "No memory for MCFG config tables\n");
 199                 return -ENOMEM;
 200         }
 201
 202         memcpy(pci_mmcfg_config, &mcfg->config, config_size);
 203         for (i = 0; i < pci_mmcfg_config_num; ++i) {
 204                 if (mcfg->config[i].base_reserved) {
 205                         printk(KERN_ERR PREFIX
 206                                "MMCONFIG not in low 4GB of memory\n");
 207                         return -ENODEV;
 208                 }
 209         }
 210
 211         return 0;
 212 }
 213 #endif                          /* CONFIG_PCI_MMCONFIG */
 214
 215 #ifdef CONFIG_X86_LOCAL_APIC
 216 static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
 217 {
 218         struct acpi_table_madt *madt = NULL;
 219
 220         if (!phys_addr || !size)
 221                 return -EINVAL;
 222
 223         madt = (struct acpi_table_madt *)__acpi_map_table(phys_addr, size);
 224         if (!madt) {
 225                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
 226                 return -ENODEV;
 227         }
 228
 229         if (madt->lapic_address) {
 230                 acpi_lapic_addr = (u64) madt->lapic_address;
 231
 232                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
 233                        madt->lapic_address);
 234         }
 235
 236         acpi_madt_oem_check(madt->header.oem_id, madt->header.oem_table_id);
 237
 238         return 0;
 239 }
 240
 241 static int __init
 242 acpi_parse_lapic(acpi_table_entry_header * header, const unsigned long end)
 243 {
 244         struct acpi_table_lapic *processor = NULL;
 245
 246         processor = (struct acpi_table_lapic *)header;
 247
 248         if (BAD_MADT_ENTRY(processor, end))
 249                 return -EINVAL;
 250
 251         acpi_table_print_madt_entry(header);
 252
 253         /* no utility in registering a disabled processor */
 254         if (processor->flags.enabled == 0)
 255                 return 0;
 256
 257         x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
 258
 259         mp_register_lapic(processor->id,        /* APIC ID */
 260                           processor->flags.enabled);    /* Enabled? */
 261
 262         return 0;
 263 }
 264
 265 static int __init
 266 acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header,
 267                           const unsigned long end)
 268 {
 269         struct acpi_table_lapic_addr_ovr *lapic_addr_ovr = NULL;
 270
 271         lapic_addr_ovr = (struct acpi_table_lapic_addr_ovr *)header;
 272
 273         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
 274                 return -EINVAL;
 275
 276         acpi_lapic_addr = lapic_addr_ovr->address;
 277
 278         return 0;
 279 }
 280
 281 static int __init
 282 acpi_parse_lapic_nmi(acpi_table_entry_header * header, const unsigned long end)
 283 {
 284         struct acpi_table_lapic_nmi *lapic_nmi = NULL;
 285
 286         lapic_nmi = (struct acpi_table_lapic_nmi *)header;
 287
 288         if (BAD_MADT_ENTRY(lapic_nmi, end))
 289                 return -EINVAL;
 290
 291         acpi_table_print_madt_entry(header);
 292
 293         if (lapic_nmi->lint != 1)
 294                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
 295
 296         return 0;
 297 }
 298
 299 #endif                          /*CONFIG_X86_LOCAL_APIC */
 300
 301 #ifdef CONFIG_X86_IO_APIC
 302
 303 static int __init
 304 acpi_parse_ioapic(acpi_table_entry_header * header, const unsigned long end)
 305 {
 306         struct acpi_table_ioapic *ioapic = NULL;
 307
 308         ioapic = (struct acpi_table_ioapic *)header;
 309
 310         if (BAD_MADT_ENTRY(ioapic, end))
 311                 return -EINVAL;
 312
 313         acpi_table_print_madt_entry(header);
 314
 315         mp_register_ioapic(ioapic->id,
 316                            ioapic->address, ioapic->global_irq_base);
 317
 318         return 0;
 319 }
 320
 321 /*
 322  * Parse Interrupt Source Override for the ACPI SCI
 323  */
 324 static void acpi_sci_ioapic_setup(u32 gsi, u16 polarity, u16 trigger)
 325 {
 326         if (trigger == 0)       /* compatible SCI trigger is level */
 327                 trigger = 3;
 328
 329         if (polarity == 0)      /* compatible SCI polarity is low */
 330                 polarity = 3;
 331
 332         /* Command-line over-ride via acpi_sci= */
 333         if (acpi_sci_flags.trigger)
 334                 trigger = acpi_sci_flags.trigger;
 335
 336         if (acpi_sci_flags.polarity)
 337                 polarity = acpi_sci_flags.polarity;
 338
 339         /*
 340          * mp_config_acpi_legacy_irqs() already setup IRQs < 16
 341          * If GSI is < 16, this will update its flags,
 342          * else it will create a new mp_irqs[] entry.
 343          */
 344         mp_override_legacy_irq(gsi, polarity, trigger, gsi);
 345
 346         /*
 347          * stash over-ride to indicate we've been here
 348          * and for later update of acpi_fadt
 349          */
 350         acpi_sci_override_gsi = gsi;
 351         return;
 352 }
 353
 354 static int __init
 355 acpi_parse_int_src_ovr(acpi_table_entry_header * header,
 356                        const unsigned long end)
 357 {
 358         struct acpi_table_int_src_ovr *intsrc = NULL;
 359
 360         intsrc = (struct acpi_table_int_src_ovr *)header;
 361
 362         if (BAD_MADT_ENTRY(intsrc, end))
 363                 return -EINVAL;
 364
 365         acpi_table_print_madt_entry(header);
 366
 367         if (intsrc->bus_irq == acpi_fadt.sci_int) {
 368                 acpi_sci_ioapic_setup(intsrc->global_irq,
 369                                       intsrc->flags.polarity,
 370                                       intsrc->flags.trigger);
 371                 return 0;
 372         }
 373
 374         if (acpi_skip_timer_override &&
 375             intsrc->bus_irq == 0 && intsrc->global_irq == 2) {
 376                 printk(PREFIX "BIOS IRQ0 pin2 override ignored.\n");
 377                 return 0;
 378         }
 379
 380         mp_override_legacy_irq(intsrc->bus_irq,
 381                                intsrc->flags.polarity,
 382                                intsrc->flags.trigger, intsrc->global_irq);
 383
 384         return 0;
 385 }
 386
 387 static int __init
 388 acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
 389 {
 390         struct acpi_table_nmi_src *nmi_src = NULL;
 391
 392         nmi_src = (struct acpi_table_nmi_src *)header;
 393
 394         if (BAD_MADT_ENTRY(nmi_src, end))
 395                 return -EINVAL;
 396
 397         acpi_table_print_madt_entry(header);
 398
 399         /* TBD: Support nimsrc entries? */
 400
 401         return 0;
 402 }
 403
 404 #endif                          /* CONFIG_X86_IO_APIC */
 405
 406 /*
 407  * acpi_pic_sci_set_trigger()
 408  *
 409  * use ELCR to set PIC-mode trigger type for SCI
 410  *
 411  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 412  * it may require Edge Trigger -- use "acpi_sci=edge"
 413  *
 414  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 415  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 416  * ECLR1 is IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
 417  * ECLR2 is IRQ's 8-15 (IRQ 8, 13 must be 0)
 418  */
 419
 420 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
 421 {
 422         unsigned int mask = 1 << irq;
 423         unsigned int old, new;
 424
 425         /* Real old ELCR mask */
 426         old = inb(0x4d0) | (inb(0x4d1) << 8);
 427
 428         /*
 429          * If we use ACPI to set PCI irq's, then we should clear ELCR
 430          * since we will set it correctly as we enable the PCI irq
 431          * routing.
 432          */
 433         new = acpi_noirq ? old : 0;
 434
 435         /*
 436          * Update SCI information in the ELCR, it isn't in the PCI
 437          * routing tables..
 438          */
 439         switch (trigger) {
 440         case 1:         /* Edge - clear */
 441                 new &= ~mask;
 442                 break;
 443         case 3:         /* Level - set */
 444                 new |= mask;
 445                 break;
 446         }
 447
 448         if (old == new)
 449                 return;
 450
 451         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
 452         outb(new, 0x4d0);
 453         outb(new >> 8, 0x4d1);
 454 }
 455
 456 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 457 {
 458 #ifdef CONFIG_X86_IO_APIC
 459         if (use_pci_vector() && !platform_legacy_irq(gsi))
 460                 *irq = IO_APIC_VECTOR(gsi);
 461         else
 462 #endif
 463                 *irq = gsi;
 464         return 0;
 465 }
 466
 467 /*
 468  * success: return IRQ number (>=0)
 469  * failure: return < 0
 470  */
 471 int acpi_register_gsi(u32 gsi, int edge_level, int active_high_low)
 472 {
 473         unsigned int irq;
 474         unsigned int plat_gsi = gsi;
 475
 476 #ifdef CONFIG_PCI
 477         /*
 478          * Make sure all (legacy) PCI IRQs are set as level-triggered.
 479          */
 480         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
 481                 extern void eisa_set_level_irq(unsigned int irq);
 482
 483                 if (edge_level == ACPI_LEVEL_SENSITIVE)
 484                         eisa_set_level_irq(gsi);
 485         }
 486 #endif
 487
 488 #ifdef CONFIG_X86_IO_APIC
 489         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
 490                 plat_gsi = mp_register_gsi(gsi, edge_level, active_high_low);
 491         }
 492 #endif
 493         acpi_gsi_to_irq(plat_gsi, &irq);
 494         return irq;
 495 }
 496
 497 EXPORT_SYMBOL(acpi_register_gsi);
 498
 499 /*
 500  *  ACPI based hotplug support for CPU
 501  */
 502 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 503 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 504 {
 505         /* TBD */
 506         return -EINVAL;
 507 }
 508
 509 EXPORT_SYMBOL(acpi_map_lsapic);
 510
 511 int acpi_unmap_lsapic(int cpu)
 512 {
 513         /* TBD */
 514         return -EINVAL;
 515 }
 516
 517 EXPORT_SYMBOL(acpi_unmap_lsapic);
 518 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 519
 520 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 521 {
 522         /* TBD */
 523         return -EINVAL;
 524 }
 525
 526 EXPORT_SYMBOL(acpi_register_ioapic);
 527
 528 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 529 {
 530         /* TBD */
 531         return -EINVAL;
 532 }
 533
 534 EXPORT_SYMBOL(acpi_unregister_ioapic);
 535
 536 static unsigned long __init
 537 acpi_scan_rsdp(unsigned long start, unsigned long length)
 538 {
 539         unsigned long offset = 0;
 540         unsigned long sig_len = sizeof("RSD PTR ") - 1;
 541
 542         /*
 543          * Scan all 16-byte boundaries of the physical memory region for the
 544          * RSDP signature.
 545          */
 546         for (offset = 0; offset < length; offset += 16) {
 547                 if (strncmp((char *)(start + offset), "RSD PTR ", sig_len))
 548                         continue;
 549                 return (start + offset);
 550         }
 551
 552         return 0;
 553 }
 554
 555 static int __init acpi_parse_sbf(unsigned long phys_addr, unsigned long size)
 556 {
 557         struct acpi_table_sbf *sb;
 558
 559         if (!phys_addr || !size)
 560                 return -EINVAL;
 561
 562         sb = (struct acpi_table_sbf *)__acpi_map_table(phys_addr, size);
 563         if (!sb) {
 564                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
 565                 return -ENODEV;
 566         }
 567
 568         sbf_port = sb->sbf_cmos;        /* Save CMOS port */
 569
 570         return 0;
 571 }
 572
 573 #ifdef CONFIG_HPET_TIMER
 574
 575 static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
 576 {
 577         struct acpi_table_hpet *hpet_tbl;
 578
 579         if (!phys || !size)
 580                 return -EINVAL;
 581
 582         hpet_tbl = (struct acpi_table_hpet *)__acpi_map_table(phys, size);
 583         if (!hpet_tbl) {
 584                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
 585                 return -ENODEV;
 586         }
 587
 588         if (hpet_tbl->addr.space_id != ACPI_SPACE_MEM) {
 589                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 590                        "memory.\n");
 591                 return -1;
 592         }
 593 #ifdef  CONFIG_X86_64
 594         vxtime.hpet_address = hpet_tbl->addr.addrl |
 595             ((long)hpet_tbl->addr.addrh << 32);
 596
 597         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 598                hpet_tbl->id, vxtime.hpet_address);
 599 #else                           /* X86 */
 600         {
 601                 extern unsigned long hpet_address;
 602
 603                 hpet_address = hpet_tbl->addr.addrl;
 604                 printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 605                        hpet_tbl->id, hpet_address);
 606         }
 607 #endif                          /* X86 */
 608
 609         return 0;
 610 }
 611 #else
 612 #define acpi_parse_hpet NULL
 613 #endif
 614
 615 #ifdef CONFIG_X86_PM_TIMER
 616 extern u32 pmtmr_ioport;
 617 #endif
 618
 619 static int __init acpi_parse_fadt(unsigned long phys, unsigned long size)
 620 {
 621         struct fadt_descriptor_rev2 *fadt = NULL;
 622
 623         fadt = (struct fadt_descriptor_rev2 *)__acpi_map_table(phys, size);
 624         if (!fadt) {
 625                 printk(KERN_WARNING PREFIX "Unable to map FADT\n");
 626                 return 0;
 627         }
 628         /* initialize sci_int early for INT_SRC_OVR MADT parsing */
 629         acpi_fadt.sci_int = fadt->sci_int;
 630
 631         /* initialize rev and apic_phys_dest_mode for x86_64 genapic */
 632         acpi_fadt.revision = fadt->revision;
 633         acpi_fadt.force_apic_physical_destination_mode =
 634             fadt->force_apic_physical_destination_mode;
 635
 636 #ifdef CONFIG_X86_PM_TIMER
 637         /* detect the location of the ACPI PM Timer */
 638         if (fadt->revision >= FADT2_REVISION_ID) {
 639                 /* FADT rev. 2 */
 640                 if (fadt->xpm_tmr_blk.address_space_id !=
 641                     ACPI_ADR_SPACE_SYSTEM_IO)
 642                         return 0;
 643
 644                 pmtmr_ioport = fadt->xpm_tmr_blk.address;
 645         } else {
 646                 /* FADT rev. 1 */
 647                 pmtmr_ioport = fadt->V1_pm_tmr_blk;
 648         }
 649         if (pmtmr_ioport)
 650                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 651                        pmtmr_ioport);
 652 #endif
 653         return 0;
 654 }
 655
 656 unsigned long __init acpi_find_rsdp(void)
 657 {
 658         unsigned long rsdp_phys = 0;
 659
 660         if (efi_enabled) {
 661                 if (efi.acpi20)
 662                         return __pa(efi.acpi20);
 663                 else if (efi.acpi)
 664                         return __pa(efi.acpi);
 665         }
 666         /*
 667          * Scan memory looking for the RSDP signature. First search EBDA (low
 668          * memory) paragraphs and then search upper memory (E0000-FFFFF).
 669          */
 670         rsdp_phys = acpi_scan_rsdp(0, 0x400);
 671         if (!rsdp_phys)
 672                 rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);
 673
 674         return rsdp_phys;
 675 }
 676
 677 #ifdef  CONFIG_X86_LOCAL_APIC
 678 /*
 679  * Parse LAPIC entries in MADT
 680  * returns 0 on success, < 0 on error
 681  */
 682 static int __init acpi_parse_madt_lapic_entries(void)
 683 {
 684         int count;
 685
 686         /*
 687          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 688          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 689          */
 690
 691         count =
 692             acpi_table_parse_madt(ACPI_MADT_LAPIC_ADDR_OVR,
 693                                   acpi_parse_lapic_addr_ovr, 0);
 694         if (count < 0) {
 695                 printk(KERN_ERR PREFIX
 696                        "Error parsing LAPIC address override entry\n");
 697                 return count;
 698         }
 699
 700         mp_register_lapic_address(acpi_lapic_addr);
 701
 702         count = acpi_table_parse_madt(ACPI_MADT_LAPIC, acpi_parse_lapic,
 703                                       MAX_APICS);
 704         if (!count) {
 705                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 706                 /* TBD: Cleanup to allow fallback to MPS */
 707                 return -ENODEV;
 708         } else if (count < 0) {
 709                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 710                 /* TBD: Cleanup to allow fallback to MPS */
 711                 return count;
 712         }
 713
 714         count =
 715             acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI, acpi_parse_lapic_nmi, 0);
 716         if (count < 0) {
 717                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 718                 /* TBD: Cleanup to allow fallback to MPS */
 719                 return count;
 720         }
 721         return 0;
 722 }
 723 #endif                          /* CONFIG_X86_LOCAL_APIC */
 724
 725 #ifdef  CONFIG_X86_IO_APIC
 726 /*
 727  * Parse IOAPIC related entries in MADT
 728  * returns 0 on success, < 0 on error
 729  */
 730 static int __init acpi_parse_madt_ioapic_entries(void)
 731 {
 732         int count;
 733
 734         /*
 735          * ACPI interpreter is required to complete interrupt setup,
 736          * so if it is off, don't enumerate the io-apics with ACPI.
 737          * If MPS is present, it will handle them,
 738          * otherwise the system will stay in PIC mode
 739          */
 740         if (acpi_disabled || acpi_noirq) {
 741                 return -ENODEV;
 742         }
 743
 744         /*
 745          * if "noapic" boot option, don't look for IO-APICs
 746          */
 747         if (skip_ioapic_setup) {
 748                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 749                        "due to 'noapic' option.\n");
 750                 return -ENODEV;
 751         }
 752
 753         count =
 754             acpi_table_parse_madt(ACPI_MADT_IOAPIC, acpi_parse_ioapic,
 755                                   MAX_IO_APICS);
 756         if (!count) {
 757                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 758                 return -ENODEV;
 759         } else if (count < 0) {
 760                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 761                 return count;
 762         }
 763
 764         count =
 765             acpi_table_parse_madt(ACPI_MADT_INT_SRC_OVR, acpi_parse_int_src_ovr,
 766                                   NR_IRQ_VECTORS);
 767         if (count < 0) {
 768                 printk(KERN_ERR PREFIX
 769                        "Error parsing interrupt source overrides entry\n");
 770                 /* TBD: Cleanup to allow fallback to MPS */
 771                 return count;
 772         }
 773
 774         /*
 775          * If BIOS did not supply an INT_SRC_OVR for the SCI
 776          * pretend we got one so we can set the SCI flags.
 777          */
 778         if (!acpi_sci_override_gsi)
 779                 acpi_sci_ioapic_setup(acpi_fadt.sci_int, 0, 0);
 780
 781         /* Fill in identity legacy mapings where no override */
 782         mp_config_acpi_legacy_irqs();
 783
 784         count =
 785             acpi_table_parse_madt(ACPI_MADT_NMI_SRC, acpi_parse_nmi_src,
 786                                   NR_IRQ_VECTORS);
 787         if (count < 0) {
 788                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 789                 /* TBD: Cleanup to allow fallback to MPS */
 790                 return count;
 791         }
 792
 793         return 0;
 794 }
 795 #else
 796 static inline int acpi_parse_madt_ioapic_entries(void)
 797 {
 798         return -1;
 799 }
 800 #endif  /* !CONFIG_X86_IO_APIC */
 801
 802 static void __init acpi_process_madt(void)
 803 {
 804 #ifdef CONFIG_X86_LOCAL_APIC
 805         int count, error;
 806
 807         count = acpi_table_parse(ACPI_APIC, acpi_parse_madt);
 808         if (count >= 1) {
 809
 810                 /*
 811                  * Parse MADT LAPIC entries
 812                  */
 813                 error = acpi_parse_madt_lapic_entries();
 814                 if (!error) {
 815                         acpi_lapic = 1;
 816
 817 #ifdef CONFIG_X86_GENERICARCH
 818                         generic_bigsmp_probe();
 819 #endif
 820                         /*
 821                          * Parse MADT IO-APIC entries
 822                          */
 823                         error = acpi_parse_madt_ioapic_entries();
 824                         if (!error) {
 825                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 826                                 acpi_irq_balance_set(NULL);
 827                                 acpi_ioapic = 1;
 828
 829                                 smp_found_config = 1;
 830                                 clustered_apic_check();
 831                         }
 832                 }
 833                 if (error == -EINVAL) {
 834                         /*
 835                          * Dell Precision Workstation 410, 610 come here.
 836                          */
 837                         printk(KERN_ERR PREFIX
 838                                "Invalid BIOS MADT, disabling ACPI\n");
 839                         disable_acpi();
 840                 }
 841         }
 842 #endif
 843         return;
 844 }
 845
 846 extern int acpi_force;
 847
 848 #ifdef __i386__
 849
 850 static int __init disable_acpi_irq(struct dmi_system_id *d)
 851 {
 852         if (!acpi_force) {
 853                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
 854                        d->ident);
 855                 acpi_noirq_set();
 856         }
 857         return 0;
 858 }
 859
 860 static int __init disable_acpi_pci(struct dmi_system_id *d)
 861 {
 862         if (!acpi_force) {
 863                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
 864                        d->ident);
 865                 acpi_disable_pci();
 866         }
 867         return 0;
 868 }
 869
 870 static int __init dmi_disable_acpi(struct dmi_system_id *d)
 871 {
 872         if (!acpi_force) {
 873                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
 874                 disable_acpi();
 875         } else {
 876                 printk(KERN_NOTICE
 877                        "Warning: DMI blacklist says broken, but acpi forced\n");
 878         }
 879         return 0;
 880 }
 881
 882 /*
 883  * Limit ACPI to CPU enumeration for HT
 884  */
 885 static int __init force_acpi_ht(struct dmi_system_id *d)
 886 {
 887         if (!acpi_force) {
 888                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
 889                        d->ident);
 890                 disable_acpi();
 891                 acpi_ht = 1;
 892         } else {
 893                 printk(KERN_NOTICE
 894                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
 895         }
 896         return 0;
 897 }
 898
 899 /*
 900  * If your system is blacklisted here, but you find that acpi=force
 901  * works for you, please contact acpi-devel@sourceforge.net
 902  */
 903 static struct dmi_system_id __initdata acpi_dmi_table[] = {
 904         /*
 905          * Boxes that need ACPI disabled
 906          */
 907         {
 908          .callback = dmi_disable_acpi,
 909          .ident = "IBM Thinkpad",
 910          .matches = {
 911                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
 912                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
 913                      },
 914          },
 915
 916         /*
 917          * Boxes that need acpi=ht
 918          */
 919         {
 920          .callback = force_acpi_ht,
 921          .ident = "FSC Primergy T850",
 922          .matches = {
 923                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 924                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
 925                      },
 926          },
 927         {
 928          .callback = force_acpi_ht,
 929          .ident = "DELL GX240",
 930          .matches = {
 931                      DMI_MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
 932                      DMI_MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
 933                      },
 934          },
 935         {
 936          .callback = force_acpi_ht,
 937          .ident = "HP VISUALIZE NT Workstation",
 938          .matches = {
 939                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 940                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
 941                      },
 942          },
 943         {
 944          .callback = force_acpi_ht,
 945          .ident = "Compaq Workstation W8000",
 946          .matches = {
 947                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
 948                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
 949                      },
 950          },
 951         {
 952          .callback = force_acpi_ht,
 953          .ident = "ASUS P4B266",
 954          .matches = {
 955                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 956                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
 957                      },
 958          },
 959         {
 960          .callback = force_acpi_ht,
 961          .ident = "ASUS P2B-DS",
 962          .matches = {
 963                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 964                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
 965                      },
 966          },
 967         {
 968          .callback = force_acpi_ht,
 969          .ident = "ASUS CUR-DLS",
 970          .matches = {
 971                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 972                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
 973                      },
 974          },
 975         {
 976          .callback = force_acpi_ht,
 977          .ident = "ABIT i440BX-W83977",
 978          .matches = {
 979                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
 980                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
 981                      },
 982          },
 983         {
 984          .callback = force_acpi_ht,
 985          .ident = "IBM Bladecenter",
 986          .matches = {
 987                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
 988                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
 989                      },
 990          },
 991         {
 992          .callback = force_acpi_ht,
 993          .ident = "IBM eServer xSeries 360",
 994          .matches = {
 995                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
 996                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
 997                      },
 998          },
 999         {
1000          .callback = force_acpi_ht,
1001          .ident = "IBM eserver xSeries 330",
1002          .matches = {
1003                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1004                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1005                      },
1006          },
1007         {
1008          .callback = force_acpi_ht,
1009          .ident = "IBM eserver xSeries 440",
1010          .matches = {
1011                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1012                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1013                      },
1014          },
1015
1016         /*
1017          * Boxes that need ACPI PCI IRQ routing disabled
1018          */
1019         {
1020          .callback = disable_acpi_irq,
1021          .ident = "ASUS A7V",
1022          .matches = {
1023                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1024                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1025                      /* newer BIOS, Revision 1011, does work */
1026                      DMI_MATCH(DMI_BIOS_VERSION,
1027                                "ASUS A7V ACPI BIOS Revision 1007"),
1028                      },
1029          },
1030
1031         /*
1032          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1033          */
1034         {                       /* _BBN 0 bug */
1035          .callback = disable_acpi_pci,
1036          .ident = "ASUS PR-DLS",
1037          .matches = {
1038                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1039                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1040                      DMI_MATCH(DMI_BIOS_VERSION,
1041                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1042                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1043                      },
1044          },
1045         {
1046          .callback = disable_acpi_pci,
1047          .ident = "Acer TravelMate 36x Laptop",
1048          .matches = {
1049                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1050                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1051                      },
1052          },
1053         {}
1054 };
1055
1056 #endif                          /* __i386__ */
1057
1058 /*
1059  * acpi_boot_table_init() and acpi_boot_init()
1060  *  called from setup_arch(), always.
1061  *      1. checksums all tables
1062  *      2. enumerates lapics
1063  *      3. enumerates io-apics
1064  *
1065  * acpi_table_init() is separate to allow reading SRAT without
1066  * other side effects.
1067  *
1068  * side effects of acpi_boot_init:
1069  *      acpi_lapic = 1 if LAPIC found
1070  *      acpi_ioapic = 1 if IOAPIC found
1071  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1072  *      if acpi_blacklisted() acpi_disabled = 1;
1073  *      acpi_irq_model=...
1074  *      ...
1075  *
1076  * return value: (currently ignored)
1077  *      0: success
1078  *      !0: failure
1079  */
1080
1081 int __init acpi_boot_table_init(void)
1082 {
1083         int error;
1084
1085 #ifdef __i386__
1086         dmi_check_system(acpi_dmi_table);
1087 #endif
1088
1089         /*
1090          * If acpi_disabled, bail out
1091          * One exception: acpi=ht continues far enough to enumerate LAPICs
1092          */
1093         if (acpi_disabled && !acpi_ht)
1094                 return 1;
1095
1096         /*
1097          * Initialize the ACPI boot-time table parser.
1098          */
1099         error = acpi_table_init();
1100         if (error) {
1101                 disable_acpi();
1102                 return error;
1103         }
1104 #ifdef __i386__
1105         check_acpi_pci();
1106 #endif
1107
1108         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1109
1110         /*
1111          * blacklist may disable ACPI entirely
1112          */
1113         error = acpi_blacklisted();
1114         if (error) {
1115                 if (acpi_force) {
1116                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1117                 } else {
1118                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1119                         disable_acpi();
1120                         return error;
1121                 }
1122         }
1123
1124         return 0;
1125 }
1126
1127 int __init acpi_boot_init(void)
1128 {
1129         /*
1130          * If acpi_disabled, bail out
1131          * One exception: acpi=ht continues far enough to enumerate LAPICs
1132          */
1133         if (acpi_disabled && !acpi_ht)
1134                 return 1;
1135
1136         acpi_table_parse(ACPI_BOOT, acpi_parse_sbf);
1137
1138         /*
1139          * set sci_int and PM timer address
1140          */
1141         acpi_table_parse(ACPI_FADT, acpi_parse_fadt);
1142
1143         /*
1144          * Process the Multiple APIC Description Table (MADT), if present
1145          */
1146         acpi_process_madt();
1147
1148         acpi_table_parse(ACPI_HPET, acpi_parse_hpet);
1149
1150         return 0;
1151 }