arch/x86/kernel/acpi/boot.c

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This source file includes following definitions.
__acpi_map_table
__acpi_unmap_table
acpi_parse_madt
acpi_register_lapic
acpi_parse_x2apic
acpi_parse_lapic
acpi_parse_sapic
acpi_parse_lapic_addr_ovr
acpi_parse_x2apic_nmi
acpi_parse_lapic_nmi
mp_override_legacy_irq
mp_config_acpi_gsi
mp_register_ioapic_irq
acpi_parse_ioapic
acpi_sci_ioapic_setup
acpi_parse_int_src_ovr
acpi_parse_nmi_src
acpi_pic_sci_set_trigger
acpi_gsi_to_irq
acpi_isa_irq_to_gsi
acpi_register_gsi_pic
acpi_register_gsi_ioapic
acpi_unregister_gsi_ioapic
acpi_register_gsi
acpi_unregister_gsi
acpi_set_irq_model_ioapic
acpi_map_cpu2node
acpi_map_cpu
acpi_unmap_cpu
acpi_register_ioapic
acpi_unregister_ioapic
acpi_ioapic_registered
acpi_parse_sbf
acpi_parse_hpet
hpet_insert_resource
acpi_parse_fadt
early_acpi_parse_madt_lapic_addr_ovr
acpi_parse_madt_lapic_entries
mp_config_acpi_legacy_irqs
acpi_parse_madt_ioapic_entries
acpi_parse_madt_ioapic_entries
early_acpi_process_madt
acpi_process_madt
disable_acpi_irq
disable_acpi_pci
dmi_disable_acpi
dmi_ignore_irq0_timer_override
acpi_generic_reduced_hw_init
acpi_reduced_hw_init
acpi_boot_table_init
early_acpi_boot_init
acpi_boot_init
parse_acpi
parse_pci
acpi_mps_check
parse_acpi_skip_timer_override
parse_acpi_use_timer_override
setup_acpi_sci
__acpi_acquire_global_lock
__acpi_release_global_lock
arch_reserve_mem_area
x86_default_set_root_pointer
x86_default_get_root_pointer
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  boot.c - Architecture-Specific Low-Level ACPI Boot Support
   4  *
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
   7  */
   8 
   9 #include <linux/init.h>
  10 #include <linux/acpi.h>
  11 #include <linux/acpi_pmtmr.h>
  12 #include <linux/efi.h>
  13 #include <linux/cpumask.h>
  14 #include <linux/export.h>
  15 #include <linux/dmi.h>
  16 #include <linux/irq.h>
  17 #include <linux/slab.h>
  18 #include <linux/memblock.h>
  19 #include <linux/ioport.h>
  20 #include <linux/pci.h>
  21 #include <linux/efi-bgrt.h>
  22 #include <linux/serial_core.h>
  23 
  24 #include <asm/e820/api.h>
  25 #include <asm/irqdomain.h>
  26 #include <asm/pci_x86.h>
  27 #include <asm/pgtable.h>
  28 #include <asm/io_apic.h>
  29 #include <asm/apic.h>
  30 #include <asm/io.h>
  31 #include <asm/mpspec.h>
  32 #include <asm/smp.h>
  33 #include <asm/i8259.h>
  34 #include <asm/setup.h>
  35 
  36 #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
  37 static int __initdata acpi_force = 0;
  38 int acpi_disabled;
  39 EXPORT_SYMBOL(acpi_disabled);
  40 
  41 #ifdef  CONFIG_X86_64
  42 # include <asm/proto.h>
  43 #endif                          /* X86 */
  44 
  45 #define PREFIX                  "ACPI: "
  46 
  47 int acpi_noirq;                         /* skip ACPI IRQ initialization */
  48 int acpi_pci_disabled;          /* skip ACPI PCI scan and IRQ initialization */
  49 EXPORT_SYMBOL(acpi_pci_disabled);
  50 
  51 int acpi_lapic;
  52 int acpi_ioapic;
  53 int acpi_strict;
  54 int acpi_disable_cmcff;
  55 
  56 /* ACPI SCI override configuration */
  57 u8 acpi_sci_flags __initdata;
  58 u32 acpi_sci_override_gsi __initdata = INVALID_ACPI_IRQ;
  59 int acpi_skip_timer_override __initdata;
  60 int acpi_use_timer_override __initdata;
  61 int acpi_fix_pin2_polarity __initdata;
  62 
  63 #ifdef CONFIG_X86_LOCAL_APIC
  64 static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  65 #endif
  66 
  67 #ifdef CONFIG_X86_IO_APIC
  68 /*
  69  * Locks related to IOAPIC hotplug
  70  * Hotplug side:
  71  *      ->device_hotplug_lock
  72  *              ->acpi_ioapic_lock
  73  *                      ->ioapic_lock
  74  * Interrupt mapping side:
  75  *      ->acpi_ioapic_lock
  76  *              ->ioapic_mutex
  77  *                      ->ioapic_lock
  78  */
  79 static DEFINE_MUTEX(acpi_ioapic_lock);
  80 #endif
  81 
  82 /* --------------------------------------------------------------------------
  83                               Boot-time Configuration
  84    -------------------------------------------------------------------------- */
  85 
  86 /*
  87  * The default interrupt routing model is PIC (8259).  This gets
  88  * overridden if IOAPICs are enumerated (below).
  89  */
  90 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PIC;
  91 
  92 
  93 /*
  94  * ISA irqs by default are the first 16 gsis but can be
  95  * any gsi as specified by an interrupt source override.
  96  */
  97 static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = {
  98         0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
  99 };
 100 
 101 /*
 102  * This is just a simple wrapper around early_memremap(),
 103  * with sanity checks for phys == 0 and size == 0.
 104  */
 105 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
 106 {
 107 
 108         if (!phys || !size)
 109                 return NULL;
 110 
 111         return early_memremap(phys, size);
 112 }
 113 
 114 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
 115 {
 116         if (!map || !size)
 117                 return;
 118 
 119         early_memunmap(map, size);
 120 }
 121 
 122 #ifdef CONFIG_X86_LOCAL_APIC
 123 static int __init acpi_parse_madt(struct acpi_table_header *table)
 124 {
 125         struct acpi_table_madt *madt = NULL;
 126 
 127         if (!boot_cpu_has(X86_FEATURE_APIC))
 128                 return -EINVAL;
 129 
 130         madt = (struct acpi_table_madt *)table;
 131         if (!madt) {
 132                 printk(KERN_WARNING PREFIX "Unable to map MADT\n");
 133                 return -ENODEV;
 134         }
 135 
 136         if (madt->address) {
 137                 acpi_lapic_addr = (u64) madt->address;
 138 
 139                 printk(KERN_DEBUG PREFIX "Local APIC address 0x%08x\n",
 140                        madt->address);
 141         }
 142 
 143         default_acpi_madt_oem_check(madt->header.oem_id,
 144                                     madt->header.oem_table_id);
 145 
 146         return 0;
 147 }
 148 
 149 /**
 150  * acpi_register_lapic - register a local apic and generates a logic cpu number
 151  * @id: local apic id to register
 152  * @acpiid: ACPI id to register
 153  * @enabled: this cpu is enabled or not
 154  *
 155  * Returns the logic cpu number which maps to the local apic
 156  */
 157 static int acpi_register_lapic(int id, u32 acpiid, u8 enabled)
 158 {
 159         unsigned int ver = 0;
 160         int cpu;
 161 
 162         if (id >= MAX_LOCAL_APIC) {
 163                 printk(KERN_INFO PREFIX "skipped apicid that is too big\n");
 164                 return -EINVAL;
 165         }
 166 
 167         if (!enabled) {
 168                 ++disabled_cpus;
 169                 return -EINVAL;
 170         }
 171 
 172         if (boot_cpu_physical_apicid != -1U)
 173                 ver = boot_cpu_apic_version;
 174 
 175         cpu = generic_processor_info(id, ver);
 176         if (cpu >= 0)
 177                 early_per_cpu(x86_cpu_to_acpiid, cpu) = acpiid;
 178 
 179         return cpu;
 180 }
 181 
 182 static int __init
 183 acpi_parse_x2apic(union acpi_subtable_headers *header, const unsigned long end)
 184 {
 185         struct acpi_madt_local_x2apic *processor = NULL;
 186 #ifdef CONFIG_X86_X2APIC
 187         u32 apic_id;
 188         u8 enabled;
 189 #endif
 190 
 191         processor = (struct acpi_madt_local_x2apic *)header;
 192 
 193         if (BAD_MADT_ENTRY(processor, end))
 194                 return -EINVAL;
 195 
 196         acpi_table_print_madt_entry(&header->common);
 197 
 198 #ifdef CONFIG_X86_X2APIC
 199         apic_id = processor->local_apic_id;
 200         enabled = processor->lapic_flags & ACPI_MADT_ENABLED;
 201 
 202         /* Ignore invalid ID */
 203         if (apic_id == 0xffffffff)
 204                 return 0;
 205 
 206         /*
 207          * We need to register disabled CPU as well to permit
 208          * counting disabled CPUs. This allows us to size
 209          * cpus_possible_map more accurately, to permit
 210          * to not preallocating memory for all NR_CPUS
 211          * when we use CPU hotplug.
 212          */
 213         if (!apic->apic_id_valid(apic_id)) {
 214                 if (enabled)
 215                         pr_warn(PREFIX "x2apic entry ignored\n");
 216                 return 0;
 217         }
 218 
 219         acpi_register_lapic(apic_id, processor->uid, enabled);
 220 #else
 221         printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
 222 #endif
 223 
 224         return 0;
 225 }
 226 
 227 static int __init
 228 acpi_parse_lapic(union acpi_subtable_headers * header, const unsigned long end)
 229 {
 230         struct acpi_madt_local_apic *processor = NULL;
 231 
 232         processor = (struct acpi_madt_local_apic *)header;
 233 
 234         if (BAD_MADT_ENTRY(processor, end))
 235                 return -EINVAL;
 236 
 237         acpi_table_print_madt_entry(&header->common);
 238 
 239         /* Ignore invalid ID */
 240         if (processor->id == 0xff)
 241                 return 0;
 242 
 243         /*
 244          * We need to register disabled CPU as well to permit
 245          * counting disabled CPUs. This allows us to size
 246          * cpus_possible_map more accurately, to permit
 247          * to not preallocating memory for all NR_CPUS
 248          * when we use CPU hotplug.
 249          */
 250         acpi_register_lapic(processor->id,      /* APIC ID */
 251                             processor->processor_id, /* ACPI ID */
 252                             processor->lapic_flags & ACPI_MADT_ENABLED);
 253 
 254         return 0;
 255 }
 256 
 257 static int __init
 258 acpi_parse_sapic(union acpi_subtable_headers *header, const unsigned long end)
 259 {
 260         struct acpi_madt_local_sapic *processor = NULL;
 261 
 262         processor = (struct acpi_madt_local_sapic *)header;
 263 
 264         if (BAD_MADT_ENTRY(processor, end))
 265                 return -EINVAL;
 266 
 267         acpi_table_print_madt_entry(&header->common);
 268 
 269         acpi_register_lapic((processor->id << 8) | processor->eid,/* APIC ID */
 270                             processor->processor_id, /* ACPI ID */
 271                             processor->lapic_flags & ACPI_MADT_ENABLED);
 272 
 273         return 0;
 274 }
 275 
 276 static int __init
 277 acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,
 278                           const unsigned long end)
 279 {
 280         struct acpi_madt_local_apic_override *lapic_addr_ovr = NULL;
 281 
 282         lapic_addr_ovr = (struct acpi_madt_local_apic_override *)header;
 283 
 284         if (BAD_MADT_ENTRY(lapic_addr_ovr, end))
 285                 return -EINVAL;
 286 
 287         acpi_table_print_madt_entry(&header->common);
 288 
 289         acpi_lapic_addr = lapic_addr_ovr->address;
 290 
 291         return 0;
 292 }
 293 
 294 static int __init
 295 acpi_parse_x2apic_nmi(union acpi_subtable_headers *header,
 296                       const unsigned long end)
 297 {
 298         struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
 299 
 300         x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
 301 
 302         if (BAD_MADT_ENTRY(x2apic_nmi, end))
 303                 return -EINVAL;
 304 
 305         acpi_table_print_madt_entry(&header->common);
 306 
 307         if (x2apic_nmi->lint != 1)
 308                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
 309 
 310         return 0;
 311 }
 312 
 313 static int __init
 314 acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long end)
 315 {
 316         struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
 317 
 318         lapic_nmi = (struct acpi_madt_local_apic_nmi *)header;
 319 
 320         if (BAD_MADT_ENTRY(lapic_nmi, end))
 321                 return -EINVAL;
 322 
 323         acpi_table_print_madt_entry(&header->common);
 324 
 325         if (lapic_nmi->lint != 1)
 326                 printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
 327 
 328         return 0;
 329 }
 330 
 331 #endif                          /*CONFIG_X86_LOCAL_APIC */
 332 
 333 #ifdef CONFIG_X86_IO_APIC
 334 #define MP_ISA_BUS              0
 335 
 336 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
 337                                                 u8 trigger, u32 gsi);
 338 
 339 static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
 340                                           u32 gsi)
 341 {
 342         /*
 343          * Check bus_irq boundary.
 344          */
 345         if (bus_irq >= NR_IRQS_LEGACY) {
 346                 pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
 347                 return;
 348         }
 349 
 350         /*
 351          * TBD: This check is for faulty timer entries, where the override
 352          *      erroneously sets the trigger to level, resulting in a HUGE
 353          *      increase of timer interrupts!
 354          */
 355         if ((bus_irq == 0) && (trigger == 3))
 356                 trigger = 1;
 357 
 358         if (mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi) < 0)
 359                 return;
 360         /*
 361          * Reset default identity mapping if gsi is also an legacy IRQ,
 362          * otherwise there will be more than one entry with the same GSI
 363          * and acpi_isa_irq_to_gsi() may give wrong result.
 364          */
 365         if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi)
 366                 isa_irq_to_gsi[gsi] = INVALID_ACPI_IRQ;
 367         isa_irq_to_gsi[bus_irq] = gsi;
 368 }
 369 
 370 static int mp_config_acpi_gsi(struct device *dev, u32 gsi, int trigger,
 371                         int polarity)
 372 {
 373 #ifdef CONFIG_X86_MPPARSE
 374         struct mpc_intsrc mp_irq;
 375         struct pci_dev *pdev;
 376         unsigned char number;
 377         unsigned int devfn;
 378         int ioapic;
 379         u8 pin;
 380 
 381         if (!acpi_ioapic)
 382                 return 0;
 383         if (!dev || !dev_is_pci(dev))
 384                 return 0;
 385 
 386         pdev = to_pci_dev(dev);
 387         number = pdev->bus->number;
 388         devfn = pdev->devfn;
 389         pin = pdev->pin;
 390         /* print the entry should happen on mptable identically */
 391         mp_irq.type = MP_INTSRC;
 392         mp_irq.irqtype = mp_INT;
 393         mp_irq.irqflag = (trigger == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
 394                                 (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
 395         mp_irq.srcbus = number;
 396         mp_irq.srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
 397         ioapic = mp_find_ioapic(gsi);
 398         mp_irq.dstapic = mpc_ioapic_id(ioapic);
 399         mp_irq.dstirq = mp_find_ioapic_pin(ioapic, gsi);
 400 
 401         mp_save_irq(&mp_irq);
 402 #endif
 403         return 0;
 404 }
 405 
 406 static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity,
 407                                                 u8 trigger, u32 gsi)
 408 {
 409         struct mpc_intsrc mp_irq;
 410         int ioapic, pin;
 411 
 412         /* Convert 'gsi' to 'ioapic.pin'(INTIN#) */
 413         ioapic = mp_find_ioapic(gsi);
 414         if (ioapic < 0) {
 415                 pr_warn("Failed to find ioapic for gsi : %u\n", gsi);
 416                 return ioapic;
 417         }
 418 
 419         pin = mp_find_ioapic_pin(ioapic, gsi);
 420 
 421         mp_irq.type = MP_INTSRC;
 422         mp_irq.irqtype = mp_INT;
 423         mp_irq.irqflag = (trigger << 2) | polarity;
 424         mp_irq.srcbus = MP_ISA_BUS;
 425         mp_irq.srcbusirq = bus_irq;
 426         mp_irq.dstapic = mpc_ioapic_id(ioapic);
 427         mp_irq.dstirq = pin;
 428 
 429         mp_save_irq(&mp_irq);
 430 
 431         return 0;
 432 }
 433 
 434 static int __init
 435 acpi_parse_ioapic(union acpi_subtable_headers * header, const unsigned long end)
 436 {
 437         struct acpi_madt_io_apic *ioapic = NULL;
 438         struct ioapic_domain_cfg cfg = {
 439                 .type = IOAPIC_DOMAIN_DYNAMIC,
 440                 .ops = &mp_ioapic_irqdomain_ops,
 441         };
 442 
 443         ioapic = (struct acpi_madt_io_apic *)header;
 444 
 445         if (BAD_MADT_ENTRY(ioapic, end))
 446                 return -EINVAL;
 447 
 448         acpi_table_print_madt_entry(&header->common);
 449 
 450         /* Statically assign IRQ numbers for IOAPICs hosting legacy IRQs */
 451         if (ioapic->global_irq_base < nr_legacy_irqs())
 452                 cfg.type = IOAPIC_DOMAIN_LEGACY;
 453 
 454         mp_register_ioapic(ioapic->id, ioapic->address, ioapic->global_irq_base,
 455                            &cfg);
 456 
 457         return 0;
 458 }
 459 
 460 /*
 461  * Parse Interrupt Source Override for the ACPI SCI
 462  */
 463 static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger, u32 gsi)
 464 {
 465         if (trigger == 0)       /* compatible SCI trigger is level */
 466                 trigger = 3;
 467 
 468         if (polarity == 0)      /* compatible SCI polarity is low */
 469                 polarity = 3;
 470 
 471         /* Command-line over-ride via acpi_sci= */
 472         if (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)
 473                 trigger = (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
 474 
 475         if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK)
 476                 polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
 477 
 478         if (bus_irq < NR_IRQS_LEGACY)
 479                 mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
 480         else
 481                 mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi);
 482 
 483         acpi_penalize_sci_irq(bus_irq, trigger, polarity);
 484 
 485         /*
 486          * stash over-ride to indicate we've been here
 487          * and for later update of acpi_gbl_FADT
 488          */
 489         acpi_sci_override_gsi = gsi;
 490         return;
 491 }
 492 
 493 static int __init
 494 acpi_parse_int_src_ovr(union acpi_subtable_headers * header,
 495                        const unsigned long end)
 496 {
 497         struct acpi_madt_interrupt_override *intsrc = NULL;
 498 
 499         intsrc = (struct acpi_madt_interrupt_override *)header;
 500 
 501         if (BAD_MADT_ENTRY(intsrc, end))
 502                 return -EINVAL;
 503 
 504         acpi_table_print_madt_entry(&header->common);
 505 
 506         if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
 507                 acpi_sci_ioapic_setup(intsrc->source_irq,
 508                                       intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 509                                       (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
 510                                       intsrc->global_irq);
 511                 return 0;
 512         }
 513 
 514         if (intsrc->source_irq == 0) {
 515                 if (acpi_skip_timer_override) {
 516                         printk(PREFIX "BIOS IRQ0 override ignored.\n");
 517                         return 0;
 518                 }
 519 
 520                 if ((intsrc->global_irq == 2) && acpi_fix_pin2_polarity
 521                         && (intsrc->inti_flags & ACPI_MADT_POLARITY_MASK)) {
 522                         intsrc->inti_flags &= ~ACPI_MADT_POLARITY_MASK;
 523                         printk(PREFIX "BIOS IRQ0 pin2 override: forcing polarity to high active.\n");
 524                 }
 525         }
 526 
 527         mp_override_legacy_irq(intsrc->source_irq,
 528                                 intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
 529                                 (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
 530                                 intsrc->global_irq);
 531 
 532         return 0;
 533 }
 534 
 535 static int __init
 536 acpi_parse_nmi_src(union acpi_subtable_headers * header, const unsigned long end)
 537 {
 538         struct acpi_madt_nmi_source *nmi_src = NULL;
 539 
 540         nmi_src = (struct acpi_madt_nmi_source *)header;
 541 
 542         if (BAD_MADT_ENTRY(nmi_src, end))
 543                 return -EINVAL;
 544 
 545         acpi_table_print_madt_entry(&header->common);
 546 
 547         /* TBD: Support nimsrc entries? */
 548 
 549         return 0;
 550 }
 551 
 552 #endif                          /* CONFIG_X86_IO_APIC */
 553 
 554 /*
 555  * acpi_pic_sci_set_trigger()
 556  *
 557  * use ELCR to set PIC-mode trigger type for SCI
 558  *
 559  * If a PIC-mode SCI is not recognized or gives spurious IRQ7's
 560  * it may require Edge Trigger -- use "acpi_sci=edge"
 561  *
 562  * Port 0x4d0-4d1 are ECLR1 and ECLR2, the Edge/Level Control Registers
 563  * for the 8259 PIC.  bit[n] = 1 means irq[n] is Level, otherwise Edge.
 564  * ECLR1 is IRQs 0-7 (IRQ 0, 1, 2 must be 0)
 565  * ECLR2 is IRQs 8-15 (IRQ 8, 13 must be 0)
 566  */
 567 
 568 void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)
 569 {
 570         unsigned int mask = 1 << irq;
 571         unsigned int old, new;
 572 
 573         /* Real old ELCR mask */
 574         old = inb(0x4d0) | (inb(0x4d1) << 8);
 575 
 576         /*
 577          * If we use ACPI to set PCI IRQs, then we should clear ELCR
 578          * since we will set it correctly as we enable the PCI irq
 579          * routing.
 580          */
 581         new = acpi_noirq ? old : 0;
 582 
 583         /*
 584          * Update SCI information in the ELCR, it isn't in the PCI
 585          * routing tables..
 586          */
 587         switch (trigger) {
 588         case 1:         /* Edge - clear */
 589                 new &= ~mask;
 590                 break;
 591         case 3:         /* Level - set */
 592                 new |= mask;
 593                 break;
 594         }
 595 
 596         if (old == new)
 597                 return;
 598 
 599         printk(PREFIX "setting ELCR to %04x (from %04x)\n", new, old);
 600         outb(new, 0x4d0);
 601         outb(new >> 8, 0x4d1);
 602 }
 603 
 604 int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
 605 {
 606         int rc, irq, trigger, polarity;
 607 
 608         if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
 609                 *irqp = gsi;
 610                 return 0;
 611         }
 612 
 613         rc = acpi_get_override_irq(gsi, &trigger, &polarity);
 614         if (rc)
 615                 return rc;
 616 
 617         trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
 618         polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
 619         irq = acpi_register_gsi(NULL, gsi, trigger, polarity);
 620         if (irq < 0)
 621                 return irq;
 622 
 623         *irqp = irq;
 624         return 0;
 625 }
 626 EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
 627 
 628 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
 629 {
 630         if (isa_irq < nr_legacy_irqs() &&
 631             isa_irq_to_gsi[isa_irq] != INVALID_ACPI_IRQ) {
 632                 *gsi = isa_irq_to_gsi[isa_irq];
 633                 return 0;
 634         }
 635 
 636         return -1;
 637 }
 638 
 639 static int acpi_register_gsi_pic(struct device *dev, u32 gsi,
 640                                  int trigger, int polarity)
 641 {
 642 #ifdef CONFIG_PCI
 643         /*
 644          * Make sure all (legacy) PCI IRQs are set as level-triggered.
 645          */
 646         if (trigger == ACPI_LEVEL_SENSITIVE)
 647                 elcr_set_level_irq(gsi);
 648 #endif
 649 
 650         return gsi;
 651 }
 652 
 653 #ifdef CONFIG_X86_LOCAL_APIC
 654 static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
 655                                     int trigger, int polarity)
 656 {
 657         int irq = gsi;
 658 #ifdef CONFIG_X86_IO_APIC
 659         int node;
 660         struct irq_alloc_info info;
 661 
 662         node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
 663         trigger = trigger == ACPI_EDGE_SENSITIVE ? 0 : 1;
 664         polarity = polarity == ACPI_ACTIVE_HIGH ? 0 : 1;
 665         ioapic_set_alloc_attr(&info, node, trigger, polarity);
 666 
 667         mutex_lock(&acpi_ioapic_lock);
 668         irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
 669         /* Don't set up the ACPI SCI because it's already set up */
 670         if (irq >= 0 && enable_update_mptable && gsi != acpi_gbl_FADT.sci_interrupt)
 671                 mp_config_acpi_gsi(dev, gsi, trigger, polarity);
 672         mutex_unlock(&acpi_ioapic_lock);
 673 #endif
 674 
 675         return irq;
 676 }
 677 
 678 static void acpi_unregister_gsi_ioapic(u32 gsi)
 679 {
 680 #ifdef CONFIG_X86_IO_APIC
 681         int irq;
 682 
 683         mutex_lock(&acpi_ioapic_lock);
 684         irq = mp_map_gsi_to_irq(gsi, 0, NULL);
 685         if (irq > 0)
 686                 mp_unmap_irq(irq);
 687         mutex_unlock(&acpi_ioapic_lock);
 688 #endif
 689 }
 690 #endif
 691 
 692 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
 693                            int trigger, int polarity) = acpi_register_gsi_pic;
 694 void (*__acpi_unregister_gsi)(u32 gsi) = NULL;
 695 
 696 #ifdef CONFIG_ACPI_SLEEP
 697 int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
 698 #else
 699 int (*acpi_suspend_lowlevel)(void);
 700 #endif
 701 
 702 /*
 703  * success: return IRQ number (>=0)
 704  * failure: return < 0
 705  */
 706 int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
 707 {
 708         return __acpi_register_gsi(dev, gsi, trigger, polarity);
 709 }
 710 EXPORT_SYMBOL_GPL(acpi_register_gsi);
 711 
 712 void acpi_unregister_gsi(u32 gsi)
 713 {
 714         if (__acpi_unregister_gsi)
 715                 __acpi_unregister_gsi(gsi);
 716 }
 717 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
 718 
 719 #ifdef CONFIG_X86_LOCAL_APIC
 720 static void __init acpi_set_irq_model_ioapic(void)
 721 {
 722         acpi_irq_model = ACPI_IRQ_MODEL_IOAPIC;
 723         __acpi_register_gsi = acpi_register_gsi_ioapic;
 724         __acpi_unregister_gsi = acpi_unregister_gsi_ioapic;
 725         acpi_ioapic = 1;
 726 }
 727 #endif
 728 
 729 /*
 730  *  ACPI based hotplug support for CPU
 731  */
 732 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 733 #include <acpi/processor.h>
 734 
 735 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
 736 {
 737 #ifdef CONFIG_ACPI_NUMA
 738         int nid;
 739 
 740         nid = acpi_get_node(handle);
 741         if (nid != NUMA_NO_NODE) {
 742                 set_apicid_to_node(physid, nid);
 743                 numa_set_node(cpu, nid);
 744         }
 745 #endif
 746         return 0;
 747 }
 748 
 749 int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
 750                  int *pcpu)
 751 {
 752         int cpu;
 753 
 754         cpu = acpi_register_lapic(physid, acpi_id, ACPI_MADT_ENABLED);
 755         if (cpu < 0) {
 756                 pr_info(PREFIX "Unable to map lapic to logical cpu number\n");
 757                 return cpu;
 758         }
 759 
 760         acpi_processor_set_pdc(handle);
 761         acpi_map_cpu2node(handle, cpu, physid);
 762 
 763         *pcpu = cpu;
 764         return 0;
 765 }
 766 EXPORT_SYMBOL(acpi_map_cpu);
 767 
 768 int acpi_unmap_cpu(int cpu)
 769 {
 770 #ifdef CONFIG_ACPI_NUMA
 771         set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
 772 #endif
 773 
 774         per_cpu(x86_cpu_to_apicid, cpu) = -1;
 775         set_cpu_present(cpu, false);
 776         num_processors--;
 777 
 778         return (0);
 779 }
 780 EXPORT_SYMBOL(acpi_unmap_cpu);
 781 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 782 
 783 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 784 {
 785         int ret = -ENOSYS;
 786 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
 787         int ioapic_id;
 788         u64 addr;
 789         struct ioapic_domain_cfg cfg = {
 790                 .type = IOAPIC_DOMAIN_DYNAMIC,
 791                 .ops = &mp_ioapic_irqdomain_ops,
 792         };
 793 
 794         ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr);
 795         if (ioapic_id < 0) {
 796                 unsigned long long uid;
 797                 acpi_status status;
 798 
 799                 status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
 800                                                NULL, &uid);
 801                 if (ACPI_FAILURE(status)) {
 802                         acpi_handle_warn(handle, "failed to get IOAPIC ID.\n");
 803                         return -EINVAL;
 804                 }
 805                 ioapic_id = (int)uid;
 806         }
 807 
 808         mutex_lock(&acpi_ioapic_lock);
 809         ret  = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg);
 810         mutex_unlock(&acpi_ioapic_lock);
 811 #endif
 812 
 813         return ret;
 814 }
 815 EXPORT_SYMBOL(acpi_register_ioapic);
 816 
 817 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 818 {
 819         int ret = -ENOSYS;
 820 
 821 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
 822         mutex_lock(&acpi_ioapic_lock);
 823         ret  = mp_unregister_ioapic(gsi_base);
 824         mutex_unlock(&acpi_ioapic_lock);
 825 #endif
 826 
 827         return ret;
 828 }
 829 EXPORT_SYMBOL(acpi_unregister_ioapic);
 830 
 831 /**
 832  * acpi_ioapic_registered - Check whether IOAPIC assoicatied with @gsi_base
 833  *                          has been registered
 834  * @handle:     ACPI handle of the IOAPIC device
 835  * @gsi_base:   GSI base associated with the IOAPIC
 836  *
 837  * Assume caller holds some type of lock to serialize acpi_ioapic_registered()
 838  * with acpi_register_ioapic()/acpi_unregister_ioapic().
 839  */
 840 int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base)
 841 {
 842         int ret = 0;
 843 
 844 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
 845         mutex_lock(&acpi_ioapic_lock);
 846         ret  = mp_ioapic_registered(gsi_base);
 847         mutex_unlock(&acpi_ioapic_lock);
 848 #endif
 849 
 850         return ret;
 851 }
 852 
 853 static int __init acpi_parse_sbf(struct acpi_table_header *table)
 854 {
 855         struct acpi_table_boot *sb = (struct acpi_table_boot *)table;
 856 
 857         sbf_port = sb->cmos_index;      /* Save CMOS port */
 858 
 859         return 0;
 860 }
 861 
 862 #ifdef CONFIG_HPET_TIMER
 863 #include <asm/hpet.h>
 864 
 865 static struct resource *hpet_res __initdata;
 866 
 867 static int __init acpi_parse_hpet(struct acpi_table_header *table)
 868 {
 869         struct acpi_table_hpet *hpet_tbl = (struct acpi_table_hpet *)table;
 870 
 871         if (hpet_tbl->address.space_id != ACPI_SPACE_MEM) {
 872                 printk(KERN_WARNING PREFIX "HPET timers must be located in "
 873                        "memory.\n");
 874                 return -1;
 875         }
 876 
 877         hpet_address = hpet_tbl->address.address;
 878         hpet_blockid = hpet_tbl->sequence;
 879 
 880         /*
 881          * Some broken BIOSes advertise HPET at 0x0. We really do not
 882          * want to allocate a resource there.
 883          */
 884         if (!hpet_address) {
 885                 printk(KERN_WARNING PREFIX
 886                        "HPET id: %#x base: %#lx is invalid\n",
 887                        hpet_tbl->id, hpet_address);
 888                 return 0;
 889         }
 890 #ifdef CONFIG_X86_64
 891         /*
 892          * Some even more broken BIOSes advertise HPET at
 893          * 0xfed0000000000000 instead of 0xfed00000. Fix it up and add
 894          * some noise:
 895          */
 896         if (hpet_address == 0xfed0000000000000UL) {
 897                 if (!hpet_force_user) {
 898                         printk(KERN_WARNING PREFIX "HPET id: %#x "
 899                                "base: 0xfed0000000000000 is bogus\n "
 900                                "try hpet=force on the kernel command line to "
 901                                "fix it up to 0xfed00000.\n", hpet_tbl->id);
 902                         hpet_address = 0;
 903                         return 0;
 904                 }
 905                 printk(KERN_WARNING PREFIX
 906                        "HPET id: %#x base: 0xfed0000000000000 fixed up "
 907                        "to 0xfed00000.\n", hpet_tbl->id);
 908                 hpet_address >>= 32;
 909         }
 910 #endif
 911         printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
 912                hpet_tbl->id, hpet_address);
 913 
 914         /*
 915          * Allocate and initialize the HPET firmware resource for adding into
 916          * the resource tree during the lateinit timeframe.
 917          */
 918 #define HPET_RESOURCE_NAME_SIZE 9
 919         hpet_res = memblock_alloc(sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE,
 920                                   SMP_CACHE_BYTES);
 921         if (!hpet_res)
 922                 panic("%s: Failed to allocate %zu bytes\n", __func__,
 923                       sizeof(*hpet_res) + HPET_RESOURCE_NAME_SIZE);
 924 
 925         hpet_res->name = (void *)&hpet_res[1];
 926         hpet_res->flags = IORESOURCE_MEM;
 927         snprintf((char *)hpet_res->name, HPET_RESOURCE_NAME_SIZE, "HPET %u",
 928                  hpet_tbl->sequence);
 929 
 930         hpet_res->start = hpet_address;
 931         hpet_res->end = hpet_address + (1 * 1024) - 1;
 932 
 933         return 0;
 934 }
 935 
 936 /*
 937  * hpet_insert_resource inserts the HPET resources used into the resource
 938  * tree.
 939  */
 940 static __init int hpet_insert_resource(void)
 941 {
 942         if (!hpet_res)
 943                 return 1;
 944 
 945         return insert_resource(&iomem_resource, hpet_res);
 946 }
 947 
 948 late_initcall(hpet_insert_resource);
 949 
 950 #else
 951 #define acpi_parse_hpet NULL
 952 #endif
 953 
 954 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 955 {
 956         if (!(acpi_gbl_FADT.boot_flags & ACPI_FADT_LEGACY_DEVICES)) {
 957                 pr_debug("ACPI: no legacy devices present\n");
 958                 x86_platform.legacy.devices.pnpbios = 0;
 959         }
 960 
 961         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
 962             !(acpi_gbl_FADT.boot_flags & ACPI_FADT_8042) &&
 963             x86_platform.legacy.i8042 != X86_LEGACY_I8042_PLATFORM_ABSENT) {
 964                 pr_debug("ACPI: i8042 controller is absent\n");
 965                 x86_platform.legacy.i8042 = X86_LEGACY_I8042_FIRMWARE_ABSENT;
 966         }
 967 
 968         if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
 969                 pr_debug("ACPI: not registering RTC platform device\n");
 970                 x86_platform.legacy.rtc = 0;
 971         }
 972 
 973         if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_VGA) {
 974                 pr_debug("ACPI: probing for VGA not safe\n");
 975                 x86_platform.legacy.no_vga = 1;
 976         }
 977 
 978 #ifdef CONFIG_X86_PM_TIMER
 979         /* detect the location of the ACPI PM Timer */
 980         if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) {
 981                 /* FADT rev. 2 */
 982                 if (acpi_gbl_FADT.xpm_timer_block.space_id !=
 983                     ACPI_ADR_SPACE_SYSTEM_IO)
 984                         return 0;
 985 
 986                 pmtmr_ioport = acpi_gbl_FADT.xpm_timer_block.address;
 987                 /*
 988                  * "X" fields are optional extensions to the original V1.0
 989                  * fields, so we must selectively expand V1.0 fields if the
 990                  * corresponding X field is zero.
 991                  */
 992                 if (!pmtmr_ioport)
 993                         pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 994         } else {
 995                 /* FADT rev. 1 */
 996                 pmtmr_ioport = acpi_gbl_FADT.pm_timer_block;
 997         }
 998         if (pmtmr_ioport)
 999                 printk(KERN_INFO PREFIX "PM-Timer IO Port: %#x\n",
1000                        pmtmr_ioport);
1001 #endif
1002         return 0;
1003 }
1004 
1005 #ifdef  CONFIG_X86_LOCAL_APIC
1006 /*
1007  * Parse LAPIC entries in MADT
1008  * returns 0 on success, < 0 on error
1009  */
1010 
1011 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
1012 {
1013         int count;
1014 
1015         if (!boot_cpu_has(X86_FEATURE_APIC))
1016                 return -ENODEV;
1017 
1018         /*
1019          * Note that the LAPIC address is obtained from the MADT (32-bit value)
1020          * and (optionally) overridden by a LAPIC_ADDR_OVR entry (64-bit value).
1021          */
1022 
1023         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE,
1024                                       acpi_parse_lapic_addr_ovr, 0);
1025         if (count < 0) {
1026                 printk(KERN_ERR PREFIX
1027                        "Error parsing LAPIC address override entry\n");
1028                 return count;
1029         }
1030 
1031         register_lapic_address(acpi_lapic_addr);
1032 
1033         return count;
1034 }
1035 
1036 static int __init acpi_parse_madt_lapic_entries(void)
1037 {
1038         int count;
1039         int x2count = 0;
1040         int ret;
1041         struct acpi_subtable_proc madt_proc[2];
1042 
1043         if (!boot_cpu_has(X86_FEATURE_APIC))
1044                 return -ENODEV;
1045 
1046         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
1047                                       acpi_parse_sapic, MAX_LOCAL_APIC);
1048 
1049         if (!count) {
1050                 memset(madt_proc, 0, sizeof(madt_proc));
1051                 madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
1052                 madt_proc[0].handler = acpi_parse_lapic;
1053                 madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
1054                 madt_proc[1].handler = acpi_parse_x2apic;
1055                 ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
1056                                 sizeof(struct acpi_table_madt),
1057                                 madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
1058                 if (ret < 0) {
1059                         printk(KERN_ERR PREFIX
1060                                         "Error parsing LAPIC/X2APIC entries\n");
1061                         return ret;
1062                 }
1063 
1064                 count = madt_proc[0].count;
1065                 x2count = madt_proc[1].count;
1066         }
1067         if (!count && !x2count) {
1068                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
1069                 /* TBD: Cleanup to allow fallback to MPS */
1070                 return -ENODEV;
1071         } else if (count < 0 || x2count < 0) {
1072                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
1073                 /* TBD: Cleanup to allow fallback to MPS */
1074                 return count;
1075         }
1076 
1077         x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
1078                                         acpi_parse_x2apic_nmi, 0);
1079         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI,
1080                                       acpi_parse_lapic_nmi, 0);
1081         if (count < 0 || x2count < 0) {
1082                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
1083                 /* TBD: Cleanup to allow fallback to MPS */
1084                 return count;
1085         }
1086         return 0;
1087 }
1088 #endif                          /* CONFIG_X86_LOCAL_APIC */
1089 
1090 #ifdef  CONFIG_X86_IO_APIC
1091 static void __init mp_config_acpi_legacy_irqs(void)
1092 {
1093         int i;
1094         struct mpc_intsrc mp_irq;
1095 
1096 #ifdef CONFIG_EISA
1097         /*
1098          * Fabricate the legacy ISA bus (bus #31).
1099          */
1100         mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
1101 #endif
1102         set_bit(MP_ISA_BUS, mp_bus_not_pci);
1103         pr_debug("Bus #%d is ISA (nIRQs: %d)\n", MP_ISA_BUS, nr_legacy_irqs());
1104 
1105         /*
1106          * Use the default configuration for the IRQs 0-15.  Unless
1107          * overridden by (MADT) interrupt source override entries.
1108          */
1109         for (i = 0; i < nr_legacy_irqs(); i++) {
1110                 int ioapic, pin;
1111                 unsigned int dstapic;
1112                 int idx;
1113                 u32 gsi;
1114 
1115                 /* Locate the gsi that irq i maps to. */
1116                 if (acpi_isa_irq_to_gsi(i, &gsi))
1117                         continue;
1118 
1119                 /*
1120                  * Locate the IOAPIC that manages the ISA IRQ.
1121                  */
1122                 ioapic = mp_find_ioapic(gsi);
1123                 if (ioapic < 0)
1124                         continue;
1125                 pin = mp_find_ioapic_pin(ioapic, gsi);
1126                 dstapic = mpc_ioapic_id(ioapic);
1127 
1128                 for (idx = 0; idx < mp_irq_entries; idx++) {
1129                         struct mpc_intsrc *irq = mp_irqs + idx;
1130 
1131                         /* Do we already have a mapping for this ISA IRQ? */
1132                         if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
1133                                 break;
1134 
1135                         /* Do we already have a mapping for this IOAPIC pin */
1136                         if (irq->dstapic == dstapic && irq->dstirq == pin)
1137                                 break;
1138                 }
1139 
1140                 if (idx != mp_irq_entries) {
1141                         printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
1142                         continue;       /* IRQ already used */
1143                 }
1144 
1145                 mp_irq.type = MP_INTSRC;
1146                 mp_irq.irqflag = 0;     /* Conforming */
1147                 mp_irq.srcbus = MP_ISA_BUS;
1148                 mp_irq.dstapic = dstapic;
1149                 mp_irq.irqtype = mp_INT;
1150                 mp_irq.srcbusirq = i; /* Identity mapped */
1151                 mp_irq.dstirq = pin;
1152 
1153                 mp_save_irq(&mp_irq);
1154         }
1155 }
1156 
1157 /*
1158  * Parse IOAPIC related entries in MADT
1159  * returns 0 on success, < 0 on error
1160  */
1161 static int __init acpi_parse_madt_ioapic_entries(void)
1162 {
1163         int count;
1164 
1165         /*
1166          * ACPI interpreter is required to complete interrupt setup,
1167          * so if it is off, don't enumerate the io-apics with ACPI.
1168          * If MPS is present, it will handle them,
1169          * otherwise the system will stay in PIC mode
1170          */
1171         if (acpi_disabled || acpi_noirq)
1172                 return -ENODEV;
1173 
1174         if (!boot_cpu_has(X86_FEATURE_APIC))
1175                 return -ENODEV;
1176 
1177         /*
1178          * if "noapic" boot option, don't look for IO-APICs
1179          */
1180         if (skip_ioapic_setup) {
1181                 printk(KERN_INFO PREFIX "Skipping IOAPIC probe "
1182                        "due to 'noapic' option.\n");
1183                 return -ENODEV;
1184         }
1185 
1186         count = acpi_table_parse_madt(ACPI_MADT_TYPE_IO_APIC, acpi_parse_ioapic,
1187                                       MAX_IO_APICS);
1188         if (!count) {
1189                 printk(KERN_ERR PREFIX "No IOAPIC entries present\n");
1190                 return -ENODEV;
1191         } else if (count < 0) {
1192                 printk(KERN_ERR PREFIX "Error parsing IOAPIC entry\n");
1193                 return count;
1194         }
1195 
1196         count = acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
1197                                       acpi_parse_int_src_ovr, nr_irqs);
1198         if (count < 0) {
1199                 printk(KERN_ERR PREFIX
1200                        "Error parsing interrupt source overrides entry\n");
1201                 /* TBD: Cleanup to allow fallback to MPS */
1202                 return count;
1203         }
1204 
1205         /*
1206          * If BIOS did not supply an INT_SRC_OVR for the SCI
1207          * pretend we got one so we can set the SCI flags.
1208          * But ignore setting up SCI on hardware reduced platforms.
1209          */
1210         if (acpi_sci_override_gsi == INVALID_ACPI_IRQ && !acpi_gbl_reduced_hardware)
1211                 acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
1212                                       acpi_gbl_FADT.sci_interrupt);
1213 
1214         /* Fill in identity legacy mappings where no override */
1215         mp_config_acpi_legacy_irqs();
1216 
1217         count = acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE,
1218                                       acpi_parse_nmi_src, nr_irqs);
1219         if (count < 0) {
1220                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
1221                 /* TBD: Cleanup to allow fallback to MPS */
1222                 return count;
1223         }
1224 
1225         return 0;
1226 }
1227 #else
1228 static inline int acpi_parse_madt_ioapic_entries(void)
1229 {
1230         return -1;
1231 }
1232 #endif  /* !CONFIG_X86_IO_APIC */
1233 
1234 static void __init early_acpi_process_madt(void)
1235 {
1236 #ifdef CONFIG_X86_LOCAL_APIC
1237         int error;
1238 
1239         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1240 
1241                 /*
1242                  * Parse MADT LAPIC entries
1243                  */
1244                 error = early_acpi_parse_madt_lapic_addr_ovr();
1245                 if (!error) {
1246                         acpi_lapic = 1;
1247                         smp_found_config = 1;
1248                 }
1249                 if (error == -EINVAL) {
1250                         /*
1251                          * Dell Precision Workstation 410, 610 come here.
1252                          */
1253                         printk(KERN_ERR PREFIX
1254                                "Invalid BIOS MADT, disabling ACPI\n");
1255                         disable_acpi();
1256                 }
1257         }
1258 #endif
1259 }
1260 
1261 static void __init acpi_process_madt(void)
1262 {
1263 #ifdef CONFIG_X86_LOCAL_APIC
1264         int error;
1265 
1266         if (!acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
1267 
1268                 /*
1269                  * Parse MADT LAPIC entries
1270                  */
1271                 error = acpi_parse_madt_lapic_entries();
1272                 if (!error) {
1273                         acpi_lapic = 1;
1274 
1275                         /*
1276                          * Parse MADT IO-APIC entries
1277                          */
1278                         mutex_lock(&acpi_ioapic_lock);
1279                         error = acpi_parse_madt_ioapic_entries();
1280                         mutex_unlock(&acpi_ioapic_lock);
1281                         if (!error) {
1282                                 acpi_set_irq_model_ioapic();
1283 
1284                                 smp_found_config = 1;
1285                         }
1286                 }
1287                 if (error == -EINVAL) {
1288                         /*
1289                          * Dell Precision Workstation 410, 610 come here.
1290                          */
1291                         printk(KERN_ERR PREFIX
1292                                "Invalid BIOS MADT, disabling ACPI\n");
1293                         disable_acpi();
1294                 }
1295         } else {
1296                 /*
1297                  * ACPI found no MADT, and so ACPI wants UP PIC mode.
1298                  * In the event an MPS table was found, forget it.
1299                  * Boot with "acpi=off" to use MPS on such a system.
1300                  */
1301                 if (smp_found_config) {
1302                         printk(KERN_WARNING PREFIX
1303                                 "No APIC-table, disabling MPS\n");
1304                         smp_found_config = 0;
1305                 }
1306         }
1307 
1308         /*
1309          * ACPI supports both logical (e.g. Hyper-Threading) and physical
1310          * processors, where MPS only supports physical.
1311          */
1312         if (acpi_lapic && acpi_ioapic)
1313                 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
1314                        "information\n");
1315         else if (acpi_lapic)
1316                 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
1317                        "configuration information\n");
1318 #endif
1319         return;
1320 }
1321 
1322 static int __init disable_acpi_irq(const struct dmi_system_id *d)
1323 {
1324         if (!acpi_force) {
1325                 printk(KERN_NOTICE "%s detected: force use of acpi=noirq\n",
1326                        d->ident);
1327                 acpi_noirq_set();
1328         }
1329         return 0;
1330 }
1331 
1332 static int __init disable_acpi_pci(const struct dmi_system_id *d)
1333 {
1334         if (!acpi_force) {
1335                 printk(KERN_NOTICE "%s detected: force use of pci=noacpi\n",
1336                        d->ident);
1337                 acpi_disable_pci();
1338         }
1339         return 0;
1340 }
1341 
1342 static int __init dmi_disable_acpi(const struct dmi_system_id *d)
1343 {
1344         if (!acpi_force) {
1345                 printk(KERN_NOTICE "%s detected: acpi off\n", d->ident);
1346                 disable_acpi();
1347         } else {
1348                 printk(KERN_NOTICE
1349                        "Warning: DMI blacklist says broken, but acpi forced\n");
1350         }
1351         return 0;
1352 }
1353 
1354 /*
1355  * Force ignoring BIOS IRQ0 override
1356  */
1357 static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
1358 {
1359         if (!acpi_skip_timer_override) {
1360                 pr_notice("%s detected: Ignoring BIOS IRQ0 override\n",
1361                         d->ident);
1362                 acpi_skip_timer_override = 1;
1363         }
1364         return 0;
1365 }
1366 
1367 /*
1368  * ACPI offers an alternative platform interface model that removes
1369  * ACPI hardware requirements for platforms that do not implement
1370  * the PC Architecture.
1371  *
1372  * We initialize the Hardware-reduced ACPI model here:
1373  */
1374 void __init acpi_generic_reduced_hw_init(void)
1375 {
1376         /*
1377          * Override x86_init functions and bypass legacy PIC in
1378          * hardware reduced ACPI mode.
1379          */
1380         x86_init.timers.timer_init      = x86_init_noop;
1381         x86_init.irqs.pre_vector_init   = x86_init_noop;
1382         legacy_pic                      = &null_legacy_pic;
1383 }
1384 
1385 static void __init acpi_reduced_hw_init(void)
1386 {
1387         if (acpi_gbl_reduced_hardware)
1388                 x86_init.acpi.reduced_hw_early_init();
1389 }
1390 
1391 /*
1392  * If your system is blacklisted here, but you find that acpi=force
1393  * works for you, please contact linux-acpi@vger.kernel.org
1394  */
1395 static const struct dmi_system_id acpi_dmi_table[] __initconst = {
1396         /*
1397          * Boxes that need ACPI disabled
1398          */
1399         {
1400          .callback = dmi_disable_acpi,
1401          .ident = "IBM Thinkpad",
1402          .matches = {
1403                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1404                      DMI_MATCH(DMI_BOARD_NAME, "2629H1G"),
1405                      },
1406          },
1407 
1408         /*
1409          * Boxes that need ACPI PCI IRQ routing disabled
1410          */
1411         {
1412          .callback = disable_acpi_irq,
1413          .ident = "ASUS A7V",
1414          .matches = {
1415                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC"),
1416                      DMI_MATCH(DMI_BOARD_NAME, "<A7V>"),
1417                      /* newer BIOS, Revision 1011, does work */
1418                      DMI_MATCH(DMI_BIOS_VERSION,
1419                                "ASUS A7V ACPI BIOS Revision 1007"),
1420                      },
1421          },
1422         {
1423                 /*
1424                  * Latest BIOS for IBM 600E (1.16) has bad pcinum
1425                  * for LPC bridge, which is needed for the PCI
1426                  * interrupt links to work. DSDT fix is in bug 5966.
1427                  * 2645, 2646 model numbers are shared with 600/600E/600X
1428                  */
1429          .callback = disable_acpi_irq,
1430          .ident = "IBM Thinkpad 600 Series 2645",
1431          .matches = {
1432                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1433                      DMI_MATCH(DMI_BOARD_NAME, "2645"),
1434                      },
1435          },
1436         {
1437          .callback = disable_acpi_irq,
1438          .ident = "IBM Thinkpad 600 Series 2646",
1439          .matches = {
1440                      DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
1441                      DMI_MATCH(DMI_BOARD_NAME, "2646"),
1442                      },
1443          },
1444         /*
1445          * Boxes that need ACPI PCI IRQ routing and PCI scan disabled
1446          */
1447         {                       /* _BBN 0 bug */
1448          .callback = disable_acpi_pci,
1449          .ident = "ASUS PR-DLS",
1450          .matches = {
1451                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1452                      DMI_MATCH(DMI_BOARD_NAME, "PR-DLS"),
1453                      DMI_MATCH(DMI_BIOS_VERSION,
1454                                "ASUS PR-DLS ACPI BIOS Revision 1010"),
1455                      DMI_MATCH(DMI_BIOS_DATE, "03/21/2003")
1456                      },
1457          },
1458         {
1459          .callback = disable_acpi_pci,
1460          .ident = "Acer TravelMate 36x Laptop",
1461          .matches = {
1462                      DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1463                      DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1464                      },
1465          },
1466         {}
1467 };
1468 
1469 /* second table for DMI checks that should run after early-quirks */
1470 static const struct dmi_system_id acpi_dmi_table_late[] __initconst = {
1471         /*
1472          * HP laptops which use a DSDT reporting as HP/SB400/10000,
1473          * which includes some code which overrides all temperature
1474          * trip points to 16C if the INTIN2 input of the I/O APIC
1475          * is enabled.  This input is incorrectly designated the
1476          * ISA IRQ 0 via an interrupt source override even though
1477          * it is wired to the output of the master 8259A and INTIN0
1478          * is not connected at all.  Force ignoring BIOS IRQ0
1479          * override in that cases.
1480          */
1481         {
1482          .callback = dmi_ignore_irq0_timer_override,
1483          .ident = "HP nx6115 laptop",
1484          .matches = {
1485                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1486                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6115"),
1487                      },
1488          },
1489         {
1490          .callback = dmi_ignore_irq0_timer_override,
1491          .ident = "HP NX6125 laptop",
1492          .matches = {
1493                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1494                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6125"),
1495                      },
1496          },
1497         {
1498          .callback = dmi_ignore_irq0_timer_override,
1499          .ident = "HP NX6325 laptop",
1500          .matches = {
1501                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1502                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6325"),
1503                      },
1504          },
1505         {
1506          .callback = dmi_ignore_irq0_timer_override,
1507          .ident = "HP 6715b laptop",
1508          .matches = {
1509                      DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1510                      DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
1511                      },
1512          },
1513         {
1514          .callback = dmi_ignore_irq0_timer_override,
1515          .ident = "FUJITSU SIEMENS",
1516          .matches = {
1517                      DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
1518                      DMI_MATCH(DMI_PRODUCT_NAME, "AMILO PRO V2030"),
1519                      },
1520          },
1521         {}
1522 };
1523 
1524 /*
1525  * acpi_boot_table_init() and acpi_boot_init()
1526  *  called from setup_arch(), always.
1527  *      1. checksums all tables
1528  *      2. enumerates lapics
1529  *      3. enumerates io-apics
1530  *
1531  * acpi_table_init() is separate to allow reading SRAT without
1532  * other side effects.
1533  *
1534  * side effects of acpi_boot_init:
1535  *      acpi_lapic = 1 if LAPIC found
1536  *      acpi_ioapic = 1 if IOAPIC found
1537  *      if (acpi_lapic && acpi_ioapic) smp_found_config = 1;
1538  *      if acpi_blacklisted() acpi_disabled = 1;
1539  *      acpi_irq_model=...
1540  *      ...
1541  */
1542 
1543 void __init acpi_boot_table_init(void)
1544 {
1545         dmi_check_system(acpi_dmi_table);
1546 
1547         /*
1548          * If acpi_disabled, bail out
1549          */
1550         if (acpi_disabled)
1551                 return;
1552 
1553         /*
1554          * Initialize the ACPI boot-time table parser.
1555          */
1556         if (acpi_table_init()) {
1557                 disable_acpi();
1558                 return;
1559         }
1560 
1561         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1562 
1563         /*
1564          * blacklist may disable ACPI entirely
1565          */
1566         if (acpi_blacklisted()) {
1567                 if (acpi_force) {
1568                         printk(KERN_WARNING PREFIX "acpi=force override\n");
1569                 } else {
1570                         printk(KERN_WARNING PREFIX "Disabling ACPI support\n");
1571                         disable_acpi();
1572                         return;
1573                 }
1574         }
1575 }
1576 
1577 int __init early_acpi_boot_init(void)
1578 {
1579         /*
1580          * If acpi_disabled, bail out
1581          */
1582         if (acpi_disabled)
1583                 return 1;
1584 
1585         /*
1586          * Process the Multiple APIC Description Table (MADT), if present
1587          */
1588         early_acpi_process_madt();
1589 
1590         /*
1591          * Hardware-reduced ACPI mode initialization:
1592          */
1593         acpi_reduced_hw_init();
1594 
1595         return 0;
1596 }
1597 
1598 int __init acpi_boot_init(void)
1599 {
1600         /* those are executed after early-quirks are executed */
1601         dmi_check_system(acpi_dmi_table_late);
1602 
1603         /*
1604          * If acpi_disabled, bail out
1605          */
1606         if (acpi_disabled)
1607                 return 1;
1608 
1609         acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf);
1610 
1611         /*
1612          * set sci_int and PM timer address
1613          */
1614         acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
1615 
1616         /*
1617          * Process the Multiple APIC Description Table (MADT), if present
1618          */
1619         acpi_process_madt();
1620 
1621         acpi_table_parse(ACPI_SIG_HPET, acpi_parse_hpet);
1622         if (IS_ENABLED(CONFIG_ACPI_BGRT))
1623                 acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
1624 
1625         if (!acpi_noirq)
1626                 x86_init.pci.init = pci_acpi_init;
1627 
1628         /* Do not enable ACPI SPCR console by default */
1629         acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
1630         return 0;
1631 }
1632 
1633 static int __init parse_acpi(char *arg)
1634 {
1635         if (!arg)
1636                 return -EINVAL;
1637 
1638         /* "acpi=off" disables both ACPI table parsing and interpreter */
1639         if (strcmp(arg, "off") == 0) {
1640                 disable_acpi();
1641         }
1642         /* acpi=force to over-ride black-list */
1643         else if (strcmp(arg, "force") == 0) {
1644                 acpi_force = 1;
1645                 acpi_disabled = 0;
1646         }
1647         /* acpi=strict disables out-of-spec workarounds */
1648         else if (strcmp(arg, "strict") == 0) {
1649                 acpi_strict = 1;
1650         }
1651         /* acpi=rsdt use RSDT instead of XSDT */
1652         else if (strcmp(arg, "rsdt") == 0) {
1653                 acpi_gbl_do_not_use_xsdt = TRUE;
1654         }
1655         /* "acpi=noirq" disables ACPI interrupt routing */
1656         else if (strcmp(arg, "noirq") == 0) {
1657                 acpi_noirq_set();
1658         }
1659         /* "acpi=copy_dsdt" copys DSDT */
1660         else if (strcmp(arg, "copy_dsdt") == 0) {
1661                 acpi_gbl_copy_dsdt_locally = 1;
1662         }
1663         /* "acpi=nocmcff" disables FF mode for corrected errors */
1664         else if (strcmp(arg, "nocmcff") == 0) {
1665                 acpi_disable_cmcff = 1;
1666         } else {
1667                 /* Core will printk when we return error. */
1668                 return -EINVAL;
1669         }
1670         return 0;
1671 }
1672 early_param("acpi", parse_acpi);
1673 
1674 /* FIXME: Using pci= for an ACPI parameter is a travesty. */
1675 static int __init parse_pci(char *arg)
1676 {
1677         if (arg && strcmp(arg, "noacpi") == 0)
1678                 acpi_disable_pci();
1679         return 0;
1680 }
1681 early_param("pci", parse_pci);
1682 
1683 int __init acpi_mps_check(void)
1684 {
1685 #if defined(CONFIG_X86_LOCAL_APIC) && !defined(CONFIG_X86_MPPARSE)
1686 /* mptable code is not built-in*/
1687         if (acpi_disabled || acpi_noirq) {
1688                 printk(KERN_WARNING "MPS support code is not built-in.\n"
1689                        "Using acpi=off or acpi=noirq or pci=noacpi "
1690                        "may have problem\n");
1691                 return 1;
1692         }
1693 #endif
1694         return 0;
1695 }
1696 
1697 #ifdef CONFIG_X86_IO_APIC
1698 static int __init parse_acpi_skip_timer_override(char *arg)
1699 {
1700         acpi_skip_timer_override = 1;
1701         return 0;
1702 }
1703 early_param("acpi_skip_timer_override", parse_acpi_skip_timer_override);
1704 
1705 static int __init parse_acpi_use_timer_override(char *arg)
1706 {
1707         acpi_use_timer_override = 1;
1708         return 0;
1709 }
1710 early_param("acpi_use_timer_override", parse_acpi_use_timer_override);
1711 #endif /* CONFIG_X86_IO_APIC */
1712 
1713 static int __init setup_acpi_sci(char *s)
1714 {
1715         if (!s)
1716                 return -EINVAL;
1717         if (!strcmp(s, "edge"))
1718                 acpi_sci_flags =  ACPI_MADT_TRIGGER_EDGE |
1719                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1720         else if (!strcmp(s, "level"))
1721                 acpi_sci_flags = ACPI_MADT_TRIGGER_LEVEL |
1722                         (acpi_sci_flags & ~ACPI_MADT_TRIGGER_MASK);
1723         else if (!strcmp(s, "high"))
1724                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_HIGH |
1725                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1726         else if (!strcmp(s, "low"))
1727                 acpi_sci_flags = ACPI_MADT_POLARITY_ACTIVE_LOW |
1728                         (acpi_sci_flags & ~ACPI_MADT_POLARITY_MASK);
1729         else
1730                 return -EINVAL;
1731         return 0;
1732 }
1733 early_param("acpi_sci", setup_acpi_sci);
1734 
1735 int __acpi_acquire_global_lock(unsigned int *lock)
1736 {
1737         unsigned int old, new, val;
1738         do {
1739                 old = *lock;
1740                 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
1741                 val = cmpxchg(lock, old, new);
1742         } while (unlikely (val != old));
1743         return ((new & 0x3) < 3) ? -1 : 0;
1744 }
1745 
1746 int __acpi_release_global_lock(unsigned int *lock)
1747 {
1748         unsigned int old, new, val;
1749         do {
1750                 old = *lock;
1751                 new = old & ~0x3;
1752                 val = cmpxchg(lock, old, new);
1753         } while (unlikely (val != old));
1754         return old & 0x1;
1755 }
1756 
1757 void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
1758 {
1759         e820__range_add(addr, size, E820_TYPE_ACPI);
1760         e820__update_table_print();
1761 }
1762 
1763 void x86_default_set_root_pointer(u64 addr)
1764 {
1765         boot_params.acpi_rsdp_addr = addr;
1766 }
1767 
1768 u64 x86_default_get_root_pointer(void)
1769 {
1770         return boot_params.acpi_rsdp_addr;
1771 }
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root/arch/x86/kernel/acpi/boot.c

DEFINITIONS
