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/acpi_pmtmr.h>
  29 #include <linux/efi.h>
  30 #include <linux/cpumask.h>
  31 #include <linux/module.h>
  32 #include <linux/dmi.h>
  33 #include <linux/irq.h>
  34 #include <linux/bootmem.h>
  35 #include <linux/ioport.h>
  36
  37 #include <asm/pgtable.h>
  38 #include <asm/io_apic.h>
  39 #include <asm/apic.h>
  40 #include <asm/io.h>
  41 #include <asm/mpspec.h>
  42
  43 static int __initdata acpi_force = 0;
  44
  45 #ifdef  CONFIG_ACPI
  46 int acpi_disabled = 0;
  47 #else
  48 int acpi_disabled = 1;
  49 #endif
  50 EXPORT_SYMBOL(acpi_disabled);
  51
  52 #ifdef  CONFIG_X86_64
  53
  54 #include <asm/proto.h>
  55
  56 static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return 0; }
  57
  58
  59 #else                           /* X86 */
  60
  61 #ifdef  CONFIG_X86_LOCAL_APIC
  62 #include <mach_apic.h>
  63 #include <mach_mpparse.h>
  64 #endif                          /* CONFIG_X86_LOCAL_APIC */
  65
  66 #endif                          /* X86 */
  67
  68 #define BAD_MADT_ENTRY(entry, end) (                                        \
  69                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  70                 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
  71
  72 #define PREFIX                  "ACPI: "
  73
  74 int acpi_noirq;                         /* skip ACPI IRQ initialization */
  75 int acpi_pci_disabled __initdata;       /* skip ACPI PCI scan and IRQ initialization */
  76 int acpi_ht __initdata = 1;     /* enable HT */
  77
  78 int acpi_lapic;
  79 int acpi_ioapic;
  80 int acpi_strict;
  81 EXPORT_SYMBOL(acpi_strict);
  82
  83 u8 acpi_sci_flags __initdata;
  84 int acpi_sci_override_gsi __initdata;
  85 int acpi_skip_timer_override __initdata;
  86 int acpi_use_timer_override __initdata;
  87
  88 #ifdef CONFIG_X86_LOCAL_APIC
  89 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  90 #endif
  91
  92 #ifndef __HAVE_ARCH_CMPXCHG
  93 #warning ACPI uses CMPXCHG, i486 and later hardware
  94 #endif
  95
  96 /* --------------------------------------------------------------------------
  97                               Boot-time Configuration
  98    -------------------------------------------------------------------------- */
  99
 100 /*
 101  * The default interrupt routing model is PIC (8259).  This gets
 102  * overriden if IOAPICs are enumerated (below).
 103  */
 104 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
 105
 106 #ifdef  CONFIG_X86_64
 107
 108 /* rely on all ACPI tables being in the direct mapping */
 109 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
 110 {
 111         if (!phys_addr || !size)
 112                 return NULL;
 113
 114         if (phys_addr+size <= (end_pfn_map << PAGE_SHIFT) + PAGE_SIZE)
 115                 return __va(phys_addr);
 116
 117         return NULL;
 118 }
 119
 120 #else
 121
 122 /*
 123  * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
 124  * to map the target physical address. The problem is that set_fixmap()
 125  * provides a single page, and it is possible that the page is not
 126  * sufficient.
 127  * By using this area, we can map up to MAX_IO_APICS pages temporarily,
 128  * i.e. until the next __va_range() call.
 129  *
 130  * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
 131  * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
 132  * count idx down while incrementing the phys address.
 133  */
 134 char *__acpi_map_table(unsigned long phys, unsigned long size)
 135 {
 136         unsigned long base, offset, mapped_size;
 137         int idx;
 138
 139         if (phys + size < 8 * 1024 * 1024)
 140                 return __va(phys);
 141
 142         offset = phys & (PAGE_SIZE - 1);
 143         mapped_size = PAGE_SIZE - offset;
 144         set_fixmap(FIX_ACPI_END, phys);
 145         base = fix_to_virt(FIX_ACPI_END);
 146
 147         /*
 148          * Most cases can be covered by the below.
 149          */
 150         idx = FIX_ACPI_END;
 151         while (mapped_size < size) {
 152                 if (--idx < FIX_ACPI_BEGIN)
 153                         return NULL;    /* cannot handle this */
 154                 phys += PAGE_SIZE;
 155                 set_fixmap(idx, phys);
 156                 mapped_size += PAGE_SIZE;
 157         }
 158
 159         return ((unsigned char *)base + offset);
 160 }
 161 #endif
 162
 163 #ifdef CONFIG_PCI_MMCONFIG
 164 /* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
 165 struct acpi_mcfg_allocation *pci_mmcfg_config;
 166 int pci_mmcfg_config_num;
 167
 168 int __init acpi_parse_mcfg(struct acpi_table_header *header)
 169 {
 170         struct acpi_table_mcfg *mcfg;
 171         unsigned long i;
 172         int config_size;
 173
 174         if (!header)
 175                 return -EINVAL;
 176
 177         mcfg = (struct acpi_table_mcfg *)header;
 178
 179         /* how many config structures do we have */
 180         pci_mmcfg_config_num = 0;
 181         i = header->length - sizeof(struct acpi_table_mcfg);
 182         while (i >= sizeof(struct acpi_mcfg_allocation)) {
 183                 ++pci_mmcfg_config_num;
 184                 i -= sizeof(struct acpi_mcfg_allocation);
 185         };
 186         if (pci_mmcfg_config_num == 0) {
 187                 printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
 188                 return -ENODEV;
 189         }
 190
 191         config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
 192         pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
 193         if (!pci_mmcfg_config) {
 194                 printk(KERN_WARNING PREFIX
 195                        "No memory for MCFG config tables\n");
 196                 return -ENOMEM;
 197         }
 198
 199         memcpy(pci_mmcfg_config, &mcfg[1], config_size);
 200         for (i = 0; i < pci_mmcfg_config_num; ++i) {
 201                 if (pci_mmcfg_config[i].address > 0xFFFFFFFF) {
 202                         printk(KERN_ERR PREFIX
 203                                "MMCONFIG not in low 4GB of memory\n");
 204                         kfree(pci_mmcfg_config);
 205                         pci_mmcfg_config_num = 0;
 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(struct acpi_table_header *table)
 216 {
 217         struct acpi_table_madt *madt = NULL;
 218
 219         if (!cpu_has_apic)
 220                 return -EINVAL;
 221
 222         madt = (struct acpi_table_madt *)table;
 223         if (!madt) {
 224                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
 225                 return -ENODEV;
 226         }
 227
 228         if (madt->address) {
 229                 acpi_lapic_addr = (u64) madt->address;
 230
 231                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
 232                        madt->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(struct acpi_subtable_header * header, const unsigned long end)
 242 {
 243         struct acpi_madt_local_apic *processor = NULL;
 244
 245         processor = (struct acpi_madt_local_apic *)header;
 246
 247         if (BAD_MADT_ENTRY(processor, end))
 248                 return -EINVAL;
 249
 250         acpi_table_print_madt_entry(header);
 251
 252         /*
 253          * We need to register disabled CPU as well to permit
 254          * counting disabled CPUs. This allows us to size
 255          * cpus_possible_map more accurately, to permit
 256          * to not preallocating memory for all NR_CPUS
 257          * when we use CPU hotplug.
 258          */
 259         mp_register_lapic(processor->id,        /* APIC ID */
 260                           processor->lapic_flags & ACPI_MADT_ENABLED);  /* Enabled? */
 261
 262         return 0;
 263 }
 264
 265 static int __init
 266 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 267                           const unsigned long end)
 268 {
 269         struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
 270
 271         lapic_addr_ovr = (struct acpi_madt_local_apic_override *)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(struct acpi_subtable_header * header, const unsigned long end)
 283 {
 284         struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
 285
 286         lapic_nmi = (struct acpi_madt_local_apic_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(struct acpi_subtable_header * header, const unsigned long end)
 305 {
 306         struct acpi_madt_io_apic *ioapic = NULL;
 307
 308         ioapic = (struct acpi_madt_io_apic *)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 __init 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 & ACPI_MADT_TRIGGER_MASK)
 334                 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
 335
 336         if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
 337                 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
 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_gbl_FADT
 349          */
 350         acpi_sci_override_gsi = gsi;
 351         return;
 352 }
 353
 354 static int __init
 355 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 356                        const unsigned long end)
 357 {
 358         struct acpi_madt_interrupt_override *intsrc = NULL;
 359
 360         intsrc = (struct acpi_madt_interrupt_override *)header;
 361
 362         if (BAD_MADT_ENTRY(intsrc, end))
 363                 return -EINVAL;
 364
 365         acpi_table_print_madt_entry(header);
 366
 367         if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
 368                 acpi_sci_ioapic_setup(intsrc->global_irq,
 369                                       intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 370                                       (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 371                 return 0;
 372         }
 373
 374         if (acpi_skip_timer_override &&
 375             intsrc->source_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->source_irq,
 381                                 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 382                                 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
 383                                 intsrc->global_irq);
 384
 385         return 0;
 386 }
 387
 388 static int __init
 389 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 390 {
 391         struct acpi_madt_nmi_source *nmi_src = NULL;
 392
 393         nmi_src = (struct acpi_madt_nmi_source *)header;
 394
 395         if (BAD_MADT_ENTRY(nmi_src, end))
 396                 return -EINVAL;
 397
 398         acpi_table_print_madt_entry(header);
 399
 400         /* TBD: Support nimsrc entries? */
 401
 402         return 0;
 403 }
 404
 405 #endif                          /* CONFIG_X86_IO_APIC */
 406
 407 /*
 408  * acpi_pic_sci_set_trigger()
 409  *
 410  * use ELCR to set PIC-mode trigger type for SCI
 411  *
 412  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 413  * it may require Edge Trigger -- use "acpi_sci=edge"
 414  *
 415  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 416  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 417  * ECLR1 is IRQ's 0-7 (IRQ 0, 1, 2 must be 0)
 418  * ECLR2 is IRQ's 8-15 (IRQ 8, 13 must be 0)
 419  */
 420
 421 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
 422 {
 423         unsigned int mask = 1 << irq;
 424         unsigned int old, new;
 425
 426         /* Real old ELCR mask */
 427         old = inb(0x4d0) | (inb(0x4d1) << 8);
 428
 429         /*
 430          * If we use ACPI to set PCI irq's, then we should clear ELCR
 431          * since we will set it correctly as we enable the PCI irq
 432          * routing.
 433          */
 434         new = acpi_noirq ? old : 0;
 435
 436         /*
 437          * Update SCI information in the ELCR, it isn't in the PCI
 438          * routing tables..
 439          */
 440         switch (trigger) {
 441         case 1:         /* Edge - clear */
 442                 new &= ~mask;
 443                 break;
 444         case 3:         /* Level - set */
 445                 new |= mask;
 446                 break;
 447         }
 448
 449         if (old == new)
 450                 return;
 451
 452         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
 453         outb(new, 0x4d0);
 454         outb(new >> 8, 0x4d1);
 455 }
 456
 457 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 458 {
 459         *irq = gsi;
 460         return 0;
 461 }
 462
 463 /*
 464  * success: return IRQ number (>=0)
 465  * failure: return < 0
 466  */
 467 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 468 {
 469         unsigned int irq;
 470         unsigned int plat_gsi = gsi;
 471
 472 #ifdef CONFIG_PCI
 473         /*
 474          * Make sure all (legacy) PCI IRQs are set as level-triggered.
 475          */
 476         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
 477                 extern void eisa_set_level_irq(unsigned int irq);
 478
 479                 if (triggering == ACPI_LEVEL_SENSITIVE)
 480                         eisa_set_level_irq(gsi);
 481         }
 482 #endif
 483
 484 #ifdef CONFIG_X86_IO_APIC
 485         if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) {
 486                 plat_gsi = mp_register_gsi(gsi, triggering, polarity);
 487         }
 488 #endif
 489         acpi_gsi_to_irq(plat_gsi, &irq);
 490         return irq;
 491 }
 492
 493 EXPORT_SYMBOL(acpi_register_gsi);
 494
 495 /*
 496  *  ACPI based hotplug support for CPU
 497  */
 498 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 499 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 500 {
 501         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 502         union acpi_object *obj;
 503         struct acpi_madt_local_apic *lapic;
 504         cpumask_t tmp_map, new_map;
 505         u8 physid;
 506         int cpu;
 507
 508         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 509                 return -EINVAL;
 510
 511         if (!buffer.length || !buffer.pointer)
 512                 return -EINVAL;
 513
 514         obj = buffer.pointer;
 515         if (obj->type != ACPI_TYPE_BUFFER ||
 516             obj->buffer.length < sizeof(*lapic)) {
 517                 kfree(buffer.pointer);
 518                 return -EINVAL;
 519         }
 520
 521         lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
 522
 523         if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
 524             !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
 525                 kfree(buffer.pointer);
 526                 return -EINVAL;
 527         }
 528
 529         physid = lapic->id;
 530
 531         kfree(buffer.pointer);
 532         buffer.length = ACPI_ALLOCATE_BUFFER;
 533         buffer.pointer = NULL;
 534
 535         tmp_map = cpu_present_map;
 536         mp_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED);
 537
 538         /*
 539          * If mp_register_lapic successfully generates a new logical cpu
 540          * number, then the following will get us exactly what was mapped
 541          */
 542         cpus_andnot(new_map, cpu_present_map, tmp_map);
 543         if (cpus_empty(new_map)) {
 544                 printk ("Unable to map lapic to logical cpu number\n");
 545                 return -EINVAL;
 546         }
 547
 548         cpu = first_cpu(new_map);
 549
 550         *pcpu = cpu;
 551         return 0;
 552 }
 553
 554 EXPORT_SYMBOL(acpi_map_lsapic);
 555
 556 int acpi_unmap_lsapic(int cpu)
 557 {
 558         x86_cpu_to_apicid[cpu] = -1;
 559         cpu_clear(cpu, cpu_present_map);
 560         num_processors--;
 561
 562         return (0);
 563 }
 564
 565 EXPORT_SYMBOL(acpi_unmap_lsapic);
 566 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 567
 568 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 569 {
 570         /* TBD */
 571         return -EINVAL;
 572 }
 573
 574 EXPORT_SYMBOL(acpi_register_ioapic);
 575
 576 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 577 {
 578         /* TBD */
 579         return -EINVAL;
 580 }
 581
 582 EXPORT_SYMBOL(acpi_unregister_ioapic);
 583
 584 static unsigned long __init
 585 acpi_scan_rsdp(unsigned long start, unsigned long length)
 586 {
 587         unsigned long offset = 0;
 588         unsigned long sig_len = sizeof("RSD PTR ") - 1;
 589
 590         /*
 591          * Scan all 16-byte boundaries of the physical memory region for the
 592          * RSDP signature.
 593          */
 594         for (offset = 0; offset < length; offset += 16) {
 595                 if (strncmp((char *)(phys_to_virt(start) + offset), "RSD PTR ", sig_len))
 596                         continue;
 597                 return (start + offset);
 598         }
 599
 600         return 0;
 601 }
 602
 603 static int __init acpi_parse_sbf(struct acpi_table_header *table)
 604 {
 605         struct acpi_table_boot *sb;
 606
 607         sb = (struct acpi_table_boot *)table;
 608         if (!sb) {
 609                 printk(KERN_WARNING PREFIX "Unable to map SBF\n");
 610                 return -ENODEV;
 611         }
 612
 613         sbf_port = sb->cmos_index;      /* Save CMOS port */
 614
 615         return 0;
 616 }
 617
 618 #ifdef CONFIG_HPET_TIMER
 619 #include <asm/hpet.h>
 620
 621 static int __init acpi_parse_hpet(struct acpi_table_header *table)
 622 {
 623         struct acpi_table_hpet *hpet_tbl;
 624
 625         hpet_tbl = (struct acpi_table_hpet *)table;
 626         if (!hpet_tbl) {
 627                 printk(KERN_WARNING PREFIX "Unable to map HPET\n");
 628                 return -ENODEV;
 629         }
 630
 631         if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
 632                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 633                        "memory.\n");
 634                 return -1;
 635         }
 636
 637         hpet_address = hpet_tbl->address.address;
 638         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 639                hpet_tbl->id, hpet_address);
 640
 641         return 0;
 642 }
 643 #else
 644 #define acpi_parse_hpet NULL
 645 #endif
 646
 647 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 648 {
 649
 650 #ifdef CONFIG_X86_PM_TIMER
 651         /* detect the location of the ACPI PM Timer */
 652         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
 653                 /* FADT rev. 2 */
 654                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
 655                     ACPI_ADR_SPACE_SYSTEM_IO)
 656                         return 0;
 657
 658                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
 659                 /*
 660                  * "X" fields are optional extensions to the original V1.0
 661                  * fields, so we must selectively expand V1.0 fields if the
 662                  * corresponding X field is zero.
 663                  */
 664                 if (!pmtmr_ioport)
 665                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 666         } else {
 667                 /* FADT rev. 1 */
 668                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 669         }
 670         if (pmtmr_ioport)
 671                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
 672                        pmtmr_ioport);
 673 #endif
 674         return 0;
 675 }
 676
 677 unsigned long __init acpi_find_rsdp(void)
 678 {
 679         unsigned long rsdp_phys = 0;
 680
 681         if (efi_enabled) {
 682                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 683                         return efi.acpi20;
 684                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 685                         return efi.acpi;
 686         }
 687         /*
 688          * Scan memory looking for the RSDP signature. First search EBDA (low
 689          * memory) paragraphs and then search upper memory (E0000-FFFFF).
 690          */
 691         rsdp_phys = acpi_scan_rsdp(0, 0x400);
 692         if (!rsdp_phys)
 693                 rsdp_phys = acpi_scan_rsdp(0xE0000, 0x20000);
 694
 695         return rsdp_phys;
 696 }
 697
 698 #ifdef  CONFIG_X86_LOCAL_APIC
 699 /*
 700  * Parse LAPIC entries in MADT
 701  * returns 0 on success, < 0 on error
 702  */
 703 static int __init acpi_parse_madt_lapic_entries(void)
 704 {
 705         int count;
 706
 707         if (!cpu_has_apic)
 708                 return -ENODEV;
 709
 710         /*
 711          * Note that the LAPIC address is obtained from the MADT (32-bit value)
 712          * and (optionally) overriden by a LAPIC_ADDR_OVR entry (64-bit value).
 713          */
 714
 715         count =
 716             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
 717                                   acpi_parse_lapic_addr_ovr, 0);
 718         if (count < 0) {
 719                 printk(KERN_ERR PREFIX
 720                        "Error parsing LAPIC address override entry\n");
 721                 return count;
 722         }
 723
 724         mp_register_lapic_address(acpi_lapic_addr);
 725
 726         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC, acpi_parse_lapic,
 727                                       MAX_APICS);
 728         if (!count) {
 729                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
 730                 /* TBD: Cleanup to allow fallback to MPS */
 731                 return -ENODEV;
 732         } else if (count < 0) {
 733                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
 734                 /* TBD: Cleanup to allow fallback to MPS */
 735                 return count;
 736         }
 737
 738         count =
 739             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
 740         if (count < 0) {
 741                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 742                 /* TBD: Cleanup to allow fallback to MPS */
 743                 return count;
 744         }
 745         return 0;
 746 }
 747 #endif                          /* CONFIG_X86_LOCAL_APIC */
 748
 749 #ifdef  CONFIG_X86_IO_APIC
 750 /*
 751  * Parse IOAPIC related entries in MADT
 752  * returns 0 on success, < 0 on error
 753  */
 754 static int __init acpi_parse_madt_ioapic_entries(void)
 755 {
 756         int count;
 757
 758         /*
 759          * ACPI interpreter is required to complete interrupt setup,
 760          * so if it is off, don't enumerate the io-apics with ACPI.
 761          * If MPS is present, it will handle them,
 762          * otherwise the system will stay in PIC mode
 763          */
 764         if (acpi_disabled || acpi_noirq) {
 765                 return -ENODEV;
 766         }
 767
 768         if (!cpu_has_apic)
 769                 return -ENODEV;
 770
 771         /*
 772          * if "noapic" boot option, don't look for IO-APICs
 773          */
 774         if (skip_ioapic_setup) {
 775                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
 776                        "due to 'noapic' option.\n");
 777                 return -ENODEV;
 778         }
 779
 780         count =
 781             acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
 782                                   MAX_IO_APICS);
 783         if (!count) {
 784                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
 785                 return -ENODEV;
 786         } else if (count < 0) {
 787                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
 788                 return count;
 789         }
 790
 791         count =
 792             acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
 793                                   NR_IRQ_VECTORS);
 794         if (count < 0) {
 795                 printk(KERN_ERR PREFIX
 796                        "Error parsing interrupt source overrides entry\n");
 797                 /* TBD: Cleanup to allow fallback to MPS */
 798                 return count;
 799         }
 800
 801         /*
 802          * If BIOS did not supply an INT_SRC_OVR for the SCI
 803          * pretend we got one so we can set the SCI flags.
 804          */
 805         if (!acpi_sci_override_gsi)
 806                 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0);
 807
 808         /* Fill in identity legacy mapings where no override */
 809         mp_config_acpi_legacy_irqs();
 810
 811         count =
 812             acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src,
 813                                   NR_IRQ_VECTORS);
 814         if (count < 0) {
 815                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 816                 /* TBD: Cleanup to allow fallback to MPS */
 817                 return count;
 818         }
 819
 820         return 0;
 821 }
 822 #else
 823 static inline int acpi_parse_madt_ioapic_entries(void)
 824 {
 825         return -1;
 826 }
 827 #endif  /* !CONFIG_X86_IO_APIC */
 828
 829 static void __init acpi_process_madt(void)
 830 {
 831 #ifdef CONFIG_X86_LOCAL_APIC
 832         int error;
 833
 834         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 835
 836                 /*
 837                  * Parse MADT LAPIC entries
 838                  */
 839                 error = acpi_parse_madt_lapic_entries();
 840                 if (!error) {
 841                         acpi_lapic = 1;
 842
 843 #ifdef CONFIG_X86_GENERICARCH
 844                         generic_bigsmp_probe();
 845 #endif
 846                         /*
 847                          * Parse MADT IO-APIC entries
 848                          */
 849                         error = acpi_parse_madt_ioapic_entries();
 850                         if (!error) {
 851                                 acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 852                                 acpi_irq_balance_set(NULL);
 853                                 acpi_ioapic = 1;
 854
 855                                 smp_found_config = 1;
 856                                 setup_apic_routing();
 857                         }
 858                 }
 859                 if (error == -EINVAL) {
 860                         /*
 861                          * Dell Precision Workstation 410, 610 come here.
 862                          */
 863                         printk(KERN_ERR PREFIX
 864                                "Invalid BIOS MADT, disabling ACPI\n");
 865                         disable_acpi();
 866                 }
 867         }
 868 #endif
 869         return;
 870 }
 871
 872 #ifdef __i386__
 873
 874 static int __init disable_acpi_irq(struct dmi_system_id *d)
 875 {
 876         if (!acpi_force) {
 877                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
 878                        d->ident);
 879                 acpi_noirq_set();
 880         }
 881         return 0;
 882 }
 883
 884 static int __init disable_acpi_pci(struct dmi_system_id *d)
 885 {
 886         if (!acpi_force) {
 887                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
 888                        d->ident);
 889                 acpi_disable_pci();
 890         }
 891         return 0;
 892 }
 893
 894 static int __init dmi_disable_acpi(struct dmi_system_id *d)
 895 {
 896         if (!acpi_force) {
 897                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
 898                 disable_acpi();
 899         } else {
 900                 printk(KERN_NOTICE
 901                        "Warning: DMI blacklist says broken, but acpi forced\n");
 902         }
 903         return 0;
 904 }
 905
 906 /*
 907  * Limit ACPI to CPU enumeration for HT
 908  */
 909 static int __init force_acpi_ht(struct dmi_system_id *d)
 910 {
 911         if (!acpi_force) {
 912                 printk(KERN_NOTICE "%s detected: force use of acpi=ht\n",
 913                        d->ident);
 914                 disable_acpi();
 915                 acpi_ht = 1;
 916         } else {
 917                 printk(KERN_NOTICE
 918                        "Warning: acpi=force overrules DMI blacklist: acpi=ht\n");
 919         }
 920         return 0;
 921 }
 922
 923 /*
 924  * If your system is blacklisted here, but you find that acpi=force
 925  * works for you, please contact acpi-devel@sourceforge.net
 926  */
 927 static struct dmi_system_id __initdata acpi_dmi_table[] = {
 928         /*
 929          * Boxes that need ACPI disabled
 930          */
 931         {
 932          .callback = dmi_disable_acpi,
 933          .ident = "IBM Thinkpad",
 934          .matches = {
 935                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
 936                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
 937                      },
 938          },
 939
 940         /*
 941          * Boxes that need acpi=ht
 942          */
 943         {
 944          .callback = force_acpi_ht,
 945          .ident = "FSC Primergy T850",
 946          .matches = {
 947                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 948                      DMI_MATCH(DMI_PRODUCT_NAME, "PRIMERGY T850"),
 949                      },
 950          },
 951         {
 952          .callback = force_acpi_ht,
 953          .ident = "DELL GX240",
 954          .matches = {
 955                      DMI_MATCH(DMI_BOARD_VENDOR, "Dell Computer Corporation"),
 956                      DMI_MATCH(DMI_BOARD_NAME, "OptiPlex GX240"),
 957                      },
 958          },
 959         {
 960          .callback = force_acpi_ht,
 961          .ident = "HP VISUALIZE NT Workstation",
 962          .matches = {
 963                      DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 964                      DMI_MATCH(DMI_PRODUCT_NAME, "HP VISUALIZE NT Workstation"),
 965                      },
 966          },
 967         {
 968          .callback = force_acpi_ht,
 969          .ident = "Compaq Workstation W8000",
 970          .matches = {
 971                      DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
 972                      DMI_MATCH(DMI_PRODUCT_NAME, "Workstation W8000"),
 973                      },
 974          },
 975         {
 976          .callback = force_acpi_ht,
 977          .ident = "ASUS P4B266",
 978          .matches = {
 979                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 980                      DMI_MATCH(DMI_BOARD_NAME, "P4B266"),
 981                      },
 982          },
 983         {
 984          .callback = force_acpi_ht,
 985          .ident = "ASUS P2B-DS",
 986          .matches = {
 987                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 988                      DMI_MATCH(DMI_BOARD_NAME, "P2B-DS"),
 989                      },
 990          },
 991         {
 992          .callback = force_acpi_ht,
 993          .ident = "ASUS CUR-DLS",
 994          .matches = {
 995                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 996                      DMI_MATCH(DMI_BOARD_NAME, "CUR-DLS"),
 997                      },
 998          },
 999         {
1000          .callback = force_acpi_ht,
1001          .ident = "ABIT i440BX-W83977",
1002          .matches = {
1003                      DMI_MATCH(DMI_BOARD_VENDOR, "ABIT <http://www.abit.com>"),
1004                      DMI_MATCH(DMI_BOARD_NAME, "i440BX-W83977 (BP6)"),
1005                      },
1006          },
1007         {
1008          .callback = force_acpi_ht,
1009          .ident = "IBM Bladecenter",
1010          .matches = {
1011                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1012                      DMI_MATCH(DMI_BOARD_NAME, "IBM eServer BladeCenter HS20"),
1013                      },
1014          },
1015         {
1016          .callback = force_acpi_ht,
1017          .ident = "IBM eServer xSeries 360",
1018          .matches = {
1019                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1020                      DMI_MATCH(DMI_BOARD_NAME, "eServer xSeries 360"),
1021                      },
1022          },
1023         {
1024          .callback = force_acpi_ht,
1025          .ident = "IBM eserver xSeries 330",
1026          .matches = {
1027                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1028                      DMI_MATCH(DMI_BOARD_NAME, "eserver xSeries 330"),
1029                      },
1030          },
1031         {
1032          .callback = force_acpi_ht,
1033          .ident = "IBM eserver xSeries 440",
1034          .matches = {
1035                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1036                      DMI_MATCH(DMI_PRODUCT_NAME, "eserver xSeries 440"),
1037                      },
1038          },
1039
1040         /*
1041          * Boxes that need ACPI PCI IRQ routing disabled
1042          */
1043         {
1044          .callback = disable_acpi_irq,
1045          .ident = "ASUS A7V",
1046          .matches = {
1047                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1048                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1049                      /* newer BIOS, Revision 1011, does work */
1050                      DMI_MATCH(DMI_BIOS_VERSION,
1051                                "ASUS A7V ACPI BIOS Revision 1007"),
1052                      },
1053          },
1054         {
1055                 /*
1056                  * Latest BIOS for IBM 600E (1.16) has bad pcinum
1057                  * for LPC bridge, which is needed for the PCI
1058                  * interrupt links to work. DSDT fix is in bug 5966.
1059                  * 2645, 2646 model numbers are shared with 600/600E/600X
1060                  */
1061          .callback = disable_acpi_irq,
1062          .ident = "IBM Thinkpad 600 Series 2645",
1063          .matches = {
1064                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1065                      DMI_MATCH(DMI_BOARD_NAME, "2645"),
1066                      },
1067          },
1068         {
1069          .callback = disable_acpi_irq,
1070          .ident = "IBM Thinkpad 600 Series 2646",
1071          .matches = {
1072                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1073                      DMI_MATCH(DMI_BOARD_NAME, "2646"),
1074                      },
1075          },
1076         /*
1077          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1078          */
1079         {                       /* _BBN 0 bug */
1080          .callback = disable_acpi_pci,
1081          .ident = "ASUS PR-DLS",
1082          .matches = {
1083                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1084                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1085                      DMI_MATCH(DMI_BIOS_VERSION,
1086                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1087                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1088                      },
1089          },
1090         {
1091          .callback = disable_acpi_pci,
1092          .ident = "Acer TravelMate 36x Laptop",
1093          .matches = {
1094                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1095                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1096                      },
1097          },
1098         {}
1099 };
1100
1101 #endif                          /* __i386__ */
1102
1103 /*
1104  * acpi_boot_table_init() and acpi_boot_init()
1105  *  called from setup_arch(), always.
1106  *      1. checksums all tables
1107  *      2. enumerates lapics
1108  *      3. enumerates io-apics
1109  *
1110  * acpi_table_init() is separate to allow reading SRAT without
1111  * other side effects.
1112  *
1113  * side effects of acpi_boot_init:
1114  *      acpi_lapic = 1 if LAPIC found
1115  *      acpi_ioapic = 1 if IOAPIC found
1116  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1117  *      if acpi_blacklisted() acpi_disabled = 1;
1118  *      acpi_irq_model=...
1119  *      ...
1120  *
1121  * return value: (currently ignored)
1122  *      0: success
1123  *      !0: failure
1124  */
1125
1126 int __init acpi_boot_table_init(void)
1127 {
1128         int error;
1129
1130 #ifdef __i386__
1131         dmi_check_system(acpi_dmi_table);
1132 #endif
1133
1134         /*
1135          * If acpi_disabled, bail out
1136          * One exception: acpi=ht continues far enough to enumerate LAPICs
1137          */
1138         if (acpi_disabled && !acpi_ht)
1139                 return 1;
1140
1141         /*
1142          * Initialize the ACPI boot-time table parser.
1143          */
1144         error = acpi_table_init();
1145         if (error) {
1146                 disable_acpi();
1147                 return error;
1148         }
1149
1150         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1151
1152         /*
1153          * blacklist may disable ACPI entirely
1154          */
1155         error = acpi_blacklisted();
1156         if (error) {
1157                 if (acpi_force) {
1158                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1159                 } else {
1160                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1161                         disable_acpi();
1162                         return error;
1163                 }
1164         }
1165
1166         return 0;
1167 }
1168
1169 int __init acpi_boot_init(void)
1170 {
1171         /*
1172          * If acpi_disabled, bail out
1173          * One exception: acpi=ht continues far enough to enumerate LAPICs
1174          */
1175         if (acpi_disabled && !acpi_ht)
1176                 return 1;
1177
1178         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1179
1180         /*
1181          * set sci_int and PM timer address
1182          */
1183         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1184
1185         /*
1186          * Process the Multiple APIC Description Table (MADT), if present
1187          */
1188         acpi_process_madt();
1189
1190         acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1191
1192         return 0;
1193 }
1194
1195 static int __init parse_acpi(char *arg)
1196 {
1197         if (!arg)
1198                 return -EINVAL;
1199
1200         /* "acpi=off" disables both ACPI table parsing and interpreter */
1201         if (strcmp(arg, "off") == 0) {
1202                 disable_acpi();
1203         }
1204         /* acpi=force to over-ride black-list */
1205         else if (strcmp(arg, "force") == 0) {
1206                 acpi_force = 1;
1207                 acpi_ht = 1;
1208                 acpi_disabled = 0;
1209         }
1210         /* acpi=strict disables out-of-spec workarounds */
1211         else if (strcmp(arg, "strict") == 0) {
1212                 acpi_strict = 1;
1213         }
1214         /* Limit ACPI just to boot-time to enable HT */
1215         else if (strcmp(arg, "ht") == 0) {
1216                 if (!acpi_force)
1217                         disable_acpi();
1218                 acpi_ht = 1;
1219         }
1220         /* "acpi=noirq" disables ACPI interrupt routing */
1221         else if (strcmp(arg, "noirq") == 0) {
1222                 acpi_noirq_set();
1223         } else {
1224                 /* Core will printk when we return error. */
1225                 return -EINVAL;
1226         }
1227         return 0;
1228 }
1229 early_param("acpi", parse_acpi);
1230
1231 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1232 static int __init parse_pci(char *arg)
1233 {
1234         if (arg && strcmp(arg, "noacpi") == 0)
1235                 acpi_disable_pci();
1236         return 0;
1237 }
1238 early_param("pci", parse_pci);
1239
1240 #ifdef CONFIG_X86_IO_APIC
1241 static int __init parse_acpi_skip_timer_override(char *arg)
1242 {
1243         acpi_skip_timer_override = 1;
1244         return 0;
1245 }
1246 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1247
1248 static int __init parse_acpi_use_timer_override(char *arg)
1249 {
1250         acpi_use_timer_override = 1;
1251         return 0;
1252 }
1253 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1254 #endif /* CONFIG_X86_IO_APIC */
1255
1256 static int __init setup_acpi_sci(char *s)
1257 {
1258         if (!s)
1259                 return -EINVAL;
1260         if (!strcmp(s, "edge"))
1261                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1262                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1263         else if (!strcmp(s, "level"))
1264                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1265                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1266         else if (!strcmp(s, "high"))
1267                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1268                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1269         else if (!strcmp(s, "low"))
1270                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1271                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1272         else
1273                 return -EINVAL;
1274         return 0;
1275 }
1276 early_param("acpi_sci", setup_acpi_sci);
1277
1278 int __acpi_acquire_global_lock(unsigned int *lock)
1279 {
1280         unsigned int old, new, val;
1281         do {
1282                 old = *lock;
1283                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1284                 val = cmpxchg(lock, old, new);
1285         } while (unlikely (val != old));
1286         return (new < 3) ? -1 : 0;
1287 }
1288
1289 int __acpi_release_global_lock(unsigned int *lock)
1290 {
1291         unsigned int old, new, val;
1292         do {
1293                 old = *lock;
1294                 new = old & ~0x3;
1295                 val = cmpxchg(lock, old, new);
1296         } while (unlikely (val != old));
1297         return old & 0x1;
1298 }