drivers/acpi/osl.c

   1 /*
   2  *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
   3  *
   4  *  Copyright (C) 2000       Andrew Henroid
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  *  Copyright (c) 2008 Intel Corporation
   8  *   Author: Matthew Wilcox <willy@linux.intel.com>
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/slab.h>
  33 #include <linux/mm.h>
  34 #include <linux/pci.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/kmod.h>
  37 #include <linux/delay.h>
  38 #include <linux/workqueue.h>
  39 #include <linux/nmi.h>
  40 #include <linux/acpi.h>
  41 #include <linux/efi.h>
  42 #include <linux/ioport.h>
  43 #include <linux/list.h>
  44 #include <linux/jiffies.h>
  45 #include <linux/semaphore.h>
  46
  47 #include <asm/io.h>
  48 #include <asm/uaccess.h>
  49
  50 #include <acpi/acpi.h>
  51 #include <acpi/acpi_bus.h>
  52 #include <acpi/processor.h>
  53
  54 #define _COMPONENT              ACPI_OS_SERVICES
  55 ACPI_MODULE_NAME("osl");
  56 #define PREFIX          "ACPI: "
  57 struct acpi_os_dpc {
  58         acpi_osd_exec_callback function;
  59         void *context;
  60         struct work_struct work;
  61         int wait;
  62 };
  63
  64 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  65 #include CONFIG_ACPI_CUSTOM_DSDT_FILE
  66 #endif
  67
  68 #ifdef ENABLE_DEBUGGER
  69 #include <linux/kdb.h>
  70
  71 /* stuff for debugger support */
  72 int acpi_in_debugger;
  73 EXPORT_SYMBOL(acpi_in_debugger);
  74
  75 extern char line_buf[80];
  76 #endif                          /*ENABLE_DEBUGGER */
  77
  78 static unsigned int acpi_irq_irq;
  79 static acpi_osd_handler acpi_irq_handler;
  80 static void *acpi_irq_context;
  81 static struct workqueue_struct *kacpid_wq;
  82 static struct workqueue_struct *kacpi_notify_wq;
  83 static struct workqueue_struct *kacpi_hotplug_wq;
  84
  85 struct acpi_res_list {
  86         resource_size_t start;
  87         resource_size_t end;
  88         acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
  89         char name[5];   /* only can have a length of 4 chars, make use of this
  90                            one instead of res->name, no need to kalloc then */
  91         struct list_head resource_list;
  92         int count;
  93 };
  94
  95 static LIST_HEAD(resource_list_head);
  96 static DEFINE_SPINLOCK(acpi_res_lock);
  97
  98 #define OSI_STRING_LENGTH_MAX 64        /* arbitrary */
  99 static char osi_additional_string[OSI_STRING_LENGTH_MAX];
 100
 101 /*
 102  * The story of _OSI(Linux)
 103  *
 104  * From pre-history through Linux-2.6.22,
 105  * Linux responded TRUE upon a BIOS OSI(Linux) query.
 106  *
 107  * Unfortunately, reference BIOS writers got wind of this
 108  * and put OSI(Linux) in their example code, quickly exposing
 109  * this string as ill-conceived and opening the door to
 110  * an un-bounded number of BIOS incompatibilities.
 111  *
 112  * For example, OSI(Linux) was used on resume to re-POST a
 113  * video card on one system, because Linux at that time
 114  * could not do a speedy restore in its native driver.
 115  * But then upon gaining quick native restore capability,
 116  * Linux has no way to tell the BIOS to skip the time-consuming
 117  * POST -- putting Linux at a permanent performance disadvantage.
 118  * On another system, the BIOS writer used OSI(Linux)
 119  * to infer native OS support for IPMI!  On other systems,
 120  * OSI(Linux) simply got in the way of Linux claiming to
 121  * be compatible with other operating systems, exposing
 122  * BIOS issues such as skipped device initialization.
 123  *
 124  * So "Linux" turned out to be a really poor chose of
 125  * OSI string, and from Linux-2.6.23 onward we respond FALSE.
 126  *
 127  * BIOS writers should NOT query _OSI(Linux) on future systems.
 128  * Linux will complain on the console when it sees it, and return FALSE.
 129  * To get Linux to return TRUE for your system  will require
 130  * a kernel source update to add a DMI entry,
 131  * or boot with "acpi_osi=Linux"
 132  */
 133
 134 static struct osi_linux {
 135         unsigned int    enable:1;
 136         unsigned int    dmi:1;
 137         unsigned int    cmdline:1;
 138         unsigned int    known:1;
 139 } osi_linux = { 0, 0, 0, 0};
 140
 141 static void __init acpi_request_region (struct acpi_generic_address *addr,
 142         unsigned int length, char *desc)
 143 {
 144         struct resource *res;
 145
 146         if (!addr->address || !length)
 147                 return;
 148
 149         if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
 150                 res = request_region(addr->address, length, desc);
 151         else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
 152                 res = request_mem_region(addr->address, length, desc);
 153 }
 154
 155 static int __init acpi_reserve_resources(void)
 156 {
 157         acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
 158                 "ACPI PM1a_EVT_BLK");
 159
 160         acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
 161                 "ACPI PM1b_EVT_BLK");
 162
 163         acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
 164                 "ACPI PM1a_CNT_BLK");
 165
 166         acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
 167                 "ACPI PM1b_CNT_BLK");
 168
 169         if (acpi_gbl_FADT.pm_timer_length == 4)
 170                 acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
 171
 172         acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
 173                 "ACPI PM2_CNT_BLK");
 174
 175         /* Length of GPE blocks must be a non-negative multiple of 2 */
 176
 177         if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
 178                 acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
 179                                acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
 180
 181         if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
 182                 acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
 183                                acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
 184
 185         return 0;
 186 }
 187 device_initcall(acpi_reserve_resources);
 188
 189 acpi_status __init acpi_os_initialize(void)
 190 {
 191         return AE_OK;
 192 }
 193
 194 static void bind_to_cpu0(struct work_struct *work)
 195 {
 196         set_cpus_allowed_ptr(current, cpumask_of(0));
 197         kfree(work);
 198 }
 199
 200 static void bind_workqueue(struct workqueue_struct *wq)
 201 {
 202         struct work_struct *work;
 203
 204         work = kzalloc(sizeof(struct work_struct), GFP_KERNEL);
 205         INIT_WORK(work, bind_to_cpu0);
 206         queue_work(wq, work);
 207 }
 208
 209 acpi_status acpi_os_initialize1(void)
 210 {
 211         /*
 212          * On some machines, a software-initiated SMI causes corruption unless
 213          * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
 214          * typically it's done in GPE-related methods that are run via
 215          * workqueues, so we can avoid the known corruption cases by binding
 216          * the workqueues to CPU 0.
 217          */
 218         kacpid_wq = create_singlethread_workqueue("kacpid");
 219         bind_workqueue(kacpid_wq);
 220         kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
 221         bind_workqueue(kacpi_notify_wq);
 222         kacpi_hotplug_wq = create_singlethread_workqueue("kacpi_hotplug");
 223         bind_workqueue(kacpi_hotplug_wq);
 224         BUG_ON(!kacpid_wq);
 225         BUG_ON(!kacpi_notify_wq);
 226         BUG_ON(!kacpi_hotplug_wq);
 227         return AE_OK;
 228 }
 229
 230 acpi_status acpi_os_terminate(void)
 231 {
 232         if (acpi_irq_handler) {
 233                 acpi_os_remove_interrupt_handler(acpi_irq_irq,
 234                                                  acpi_irq_handler);
 235         }
 236
 237         destroy_workqueue(kacpid_wq);
 238         destroy_workqueue(kacpi_notify_wq);
 239         destroy_workqueue(kacpi_hotplug_wq);
 240
 241         return AE_OK;
 242 }
 243
 244 void acpi_os_printf(const char *fmt, ...)
 245 {
 246         va_list args;
 247         va_start(args, fmt);
 248         acpi_os_vprintf(fmt, args);
 249         va_end(args);
 250 }
 251
 252 void acpi_os_vprintf(const char *fmt, va_list args)
 253 {
 254         static char buffer[512];
 255
 256         vsprintf(buffer, fmt, args);
 257
 258 #ifdef ENABLE_DEBUGGER
 259         if (acpi_in_debugger) {
 260                 kdb_printf("%s", buffer);
 261         } else {
 262                 printk(KERN_CONT "%s", buffer);
 263         }
 264 #else
 265         printk(KERN_CONT "%s", buffer);
 266 #endif
 267 }
 268
 269 acpi_physical_address __init acpi_os_get_root_pointer(void)
 270 {
 271         if (efi_enabled) {
 272                 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
 273                         return efi.acpi20;
 274                 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
 275                         return efi.acpi;
 276                 else {
 277                         printk(KERN_ERR PREFIX
 278                                "System description tables not found\n");
 279                         return 0;
 280                 }
 281         } else {
 282                 acpi_physical_address pa = 0;
 283
 284                 acpi_find_root_pointer(&pa);
 285                 return pa;
 286         }
 287 }
 288
 289 void __iomem *__init_refok
 290 acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 291 {
 292         if (phys > ULONG_MAX) {
 293                 printk(KERN_ERR PREFIX "Cannot map memory that high\n");
 294                 return NULL;
 295         }
 296         if (acpi_gbl_permanent_mmap)
 297                 /*
 298                 * ioremap checks to ensure this is in reserved space
 299                 */
 300                 return ioremap((unsigned long)phys, size);
 301         else
 302                 return __acpi_map_table((unsigned long)phys, size);
 303 }
 304 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 305
 306 void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 307 {
 308         if (acpi_gbl_permanent_mmap)
 309                 iounmap(virt);
 310         else
 311                 __acpi_unmap_table(virt, size);
 312 }
 313 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 314
 315 void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 316 {
 317         if (!acpi_gbl_permanent_mmap)
 318                 __acpi_unmap_table(virt, size);
 319 }
 320
 321 #ifdef ACPI_FUTURE_USAGE
 322 acpi_status
 323 acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
 324 {
 325         if (!phys || !virt)
 326                 return AE_BAD_PARAMETER;
 327
 328         *phys = virt_to_phys(virt);
 329
 330         return AE_OK;
 331 }
 332 #endif
 333
 334 #define ACPI_MAX_OVERRIDE_LEN 100
 335
 336 static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
 337
 338 acpi_status
 339 acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
 340                             acpi_string * new_val)
 341 {
 342         if (!init_val || !new_val)
 343                 return AE_BAD_PARAMETER;
 344
 345         *new_val = NULL;
 346         if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
 347                 printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
 348                        acpi_os_name);
 349                 *new_val = acpi_os_name;
 350         }
 351
 352         return AE_OK;
 353 }
 354
 355 acpi_status
 356 acpi_os_table_override(struct acpi_table_header * existing_table,
 357                        struct acpi_table_header ** new_table)
 358 {
 359         if (!existing_table || !new_table)
 360                 return AE_BAD_PARAMETER;
 361
 362         *new_table = NULL;
 363
 364 #ifdef CONFIG_ACPI_CUSTOM_DSDT
 365         if (strncmp(existing_table->signature, "DSDT", 4) == 0)
 366                 *new_table = (struct acpi_table_header *)AmlCode;
 367 #endif
 368         if (*new_table != NULL) {
 369                 printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
 370                            "this is unsafe: tainting kernel\n",
 371                        existing_table->signature,
 372                        existing_table->oem_table_id);
 373                 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
 374         }
 375         return AE_OK;
 376 }
 377
 378 static irqreturn_t acpi_irq(int irq, void *dev_id)
 379 {
 380         u32 handled;
 381
 382         handled = (*acpi_irq_handler) (acpi_irq_context);
 383
 384         if (handled) {
 385                 acpi_irq_handled++;
 386                 return IRQ_HANDLED;
 387         } else {
 388                 acpi_irq_not_handled++;
 389                 return IRQ_NONE;
 390         }
 391 }
 392
 393 acpi_status
 394 acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
 395                                   void *context)
 396 {
 397         unsigned int irq;
 398
 399         acpi_irq_stats_init();
 400
 401         /*
 402          * Ignore the GSI from the core, and use the value in our copy of the
 403          * FADT. It may not be the same if an interrupt source override exists
 404          * for the SCI.
 405          */
 406         gsi = acpi_gbl_FADT.sci_interrupt;
 407         if (acpi_gsi_to_irq(gsi, &irq) < 0) {
 408                 printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
 409                        gsi);
 410                 return AE_OK;
 411         }
 412
 413         acpi_irq_handler = handler;
 414         acpi_irq_context = context;
 415         if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
 416                 printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
 417                 return AE_NOT_ACQUIRED;
 418         }
 419         acpi_irq_irq = irq;
 420
 421         return AE_OK;
 422 }
 423
 424 acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
 425 {
 426         if (irq) {
 427                 free_irq(irq, acpi_irq);
 428                 acpi_irq_handler = NULL;
 429                 acpi_irq_irq = 0;
 430         }
 431
 432         return AE_OK;
 433 }
 434
 435 /*
 436  * Running in interpreter thread context, safe to sleep
 437  */
 438
 439 void acpi_os_sleep(acpi_integer ms)
 440 {
 441         schedule_timeout_interruptible(msecs_to_jiffies(ms));
 442 }
 443
 444 void acpi_os_stall(u32 us)
 445 {
 446         while (us) {
 447                 u32 delay = 1000;
 448
 449                 if (delay > us)
 450                         delay = us;
 451                 udelay(delay);
 452                 touch_nmi_watchdog();
 453                 us -= delay;
 454         }
 455 }
 456
 457 /*
 458  * Support ACPI 3.0 AML Timer operand
 459  * Returns 64-bit free-running, monotonically increasing timer
 460  * with 100ns granularity
 461  */
 462 u64 acpi_os_get_timer(void)
 463 {
 464         static u64 t;
 465
 466 #ifdef  CONFIG_HPET
 467         /* TBD: use HPET if available */
 468 #endif
 469
 470 #ifdef  CONFIG_X86_PM_TIMER
 471         /* TBD: default to PM timer if HPET was not available */
 472 #endif
 473         if (!t)
 474                 printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
 475
 476         return ++t;
 477 }
 478
 479 acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
 480 {
 481         u32 dummy;
 482
 483         if (!value)
 484                 value = &dummy;
 485
 486         *value = 0;
 487         if (width <= 8) {
 488                 *(u8 *) value = inb(port);
 489         } else if (width <= 16) {
 490                 *(u16 *) value = inw(port);
 491         } else if (width <= 32) {
 492                 *(u32 *) value = inl(port);
 493         } else {
 494                 BUG();
 495         }
 496
 497         return AE_OK;
 498 }
 499
 500 EXPORT_SYMBOL(acpi_os_read_port);
 501
 502 acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
 503 {
 504         if (width <= 8) {
 505                 outb(value, port);
 506         } else if (width <= 16) {
 507                 outw(value, port);
 508         } else if (width <= 32) {
 509                 outl(value, port);
 510         } else {
 511                 BUG();
 512         }
 513
 514         return AE_OK;
 515 }
 516
 517 EXPORT_SYMBOL(acpi_os_write_port);
 518
 519 acpi_status
 520 acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
 521 {
 522         u32 dummy;
 523         void __iomem *virt_addr;
 524
 525         virt_addr = ioremap(phys_addr, width);
 526         if (!value)
 527                 value = &dummy;
 528
 529         switch (width) {
 530         case 8:
 531                 *(u8 *) value = readb(virt_addr);
 532                 break;
 533         case 16:
 534                 *(u16 *) value = readw(virt_addr);
 535                 break;
 536         case 32:
 537                 *(u32 *) value = readl(virt_addr);
 538                 break;
 539         default:
 540                 BUG();
 541         }
 542
 543         iounmap(virt_addr);
 544
 545         return AE_OK;
 546 }
 547
 548 acpi_status
 549 acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
 550 {
 551         void __iomem *virt_addr;
 552
 553         virt_addr = ioremap(phys_addr, width);
 554
 555         switch (width) {
 556         case 8:
 557                 writeb(value, virt_addr);
 558                 break;
 559         case 16:
 560                 writew(value, virt_addr);
 561                 break;
 562         case 32:
 563                 writel(value, virt_addr);
 564                 break;
 565         default:
 566                 BUG();
 567         }
 568
 569         iounmap(virt_addr);
 570
 571         return AE_OK;
 572 }
 573
 574 acpi_status
 575 acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 576                                u32 *value, u32 width)
 577 {
 578         int result, size;
 579
 580         if (!value)
 581                 return AE_BAD_PARAMETER;
 582
 583         switch (width) {
 584         case 8:
 585                 size = 1;
 586                 break;
 587         case 16:
 588                 size = 2;
 589                 break;
 590         case 32:
 591                 size = 4;
 592                 break;
 593         default:
 594                 return AE_ERROR;
 595         }
 596
 597         result = raw_pci_read(pci_id->segment, pci_id->bus,
 598                                 PCI_DEVFN(pci_id->device, pci_id->function),
 599                                 reg, size, value);
 600
 601         return (result ? AE_ERROR : AE_OK);
 602 }
 603
 604 acpi_status
 605 acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
 606                                 acpi_integer value, u32 width)
 607 {
 608         int result, size;
 609
 610         switch (width) {
 611         case 8:
 612                 size = 1;
 613                 break;
 614         case 16:
 615                 size = 2;
 616                 break;
 617         case 32:
 618                 size = 4;
 619                 break;
 620         default:
 621                 return AE_ERROR;
 622         }
 623
 624         result = raw_pci_write(pci_id->segment, pci_id->bus,
 625                                 PCI_DEVFN(pci_id->device, pci_id->function),
 626                                 reg, size, value);
 627
 628         return (result ? AE_ERROR : AE_OK);
 629 }
 630
 631 /* TODO: Change code to take advantage of driver model more */
 632 static void acpi_os_derive_pci_id_2(acpi_handle rhandle,        /* upper bound  */
 633                                     acpi_handle chandle,        /* current node */
 634                                     struct acpi_pci_id **id,
 635                                     int *is_bridge, u8 * bus_number)
 636 {
 637         acpi_handle handle;
 638         struct acpi_pci_id *pci_id = *id;
 639         acpi_status status;
 640         unsigned long long temp;
 641         acpi_object_type type;
 642
 643         acpi_get_parent(chandle, &handle);
 644         if (handle != rhandle) {
 645                 acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
 646                                         bus_number);
 647
 648                 status = acpi_get_type(handle, &type);
 649                 if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
 650                         return;
 651
 652                 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
 653                                           &temp);
 654                 if (ACPI_SUCCESS(status)) {
 655                         u32 val;
 656                         pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
 657                         pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
 658
 659                         if (*is_bridge)
 660                                 pci_id->bus = *bus_number;
 661
 662                         /* any nicer way to get bus number of bridge ? */
 663                         status =
 664                             acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
 665                                                            8);
 666                         if (ACPI_SUCCESS(status)
 667                             && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
 668                                 status =
 669                                     acpi_os_read_pci_configuration(pci_id, 0x18,
 670                                                                    &val, 8);
 671                                 if (!ACPI_SUCCESS(status)) {
 672                                         /* Certainly broken...  FIX ME */
 673                                         return;
 674                                 }
 675                                 *is_bridge = 1;
 676                                 pci_id->bus = val;
 677                                 status =
 678                                     acpi_os_read_pci_configuration(pci_id, 0x19,
 679                                                                    &val, 8);
 680                                 if (ACPI_SUCCESS(status)) {
 681                                         *bus_number = val;
 682                                 }
 683                         } else
 684                                 *is_bridge = 0;
 685                 }
 686         }
 687 }
 688
 689 void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
 690                            acpi_handle chandle, /* current node */
 691                            struct acpi_pci_id **id)
 692 {
 693         int is_bridge = 1;
 694         u8 bus_number = (*id)->bus;
 695
 696         acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
 697 }
 698
 699 static void acpi_os_execute_deferred(struct work_struct *work)
 700 {
 701         struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
 702
 703         if (dpc->wait)
 704                 acpi_os_wait_events_complete(NULL);
 705
 706         dpc->function(dpc->context);
 707         kfree(dpc);
 708 }
 709
 710 /*******************************************************************************
 711  *
 712  * FUNCTION:    acpi_os_execute
 713  *
 714  * PARAMETERS:  Type               - Type of the callback
 715  *              Function           - Function to be executed
 716  *              Context            - Function parameters
 717  *
 718  * RETURN:      Status
 719  *
 720  * DESCRIPTION: Depending on type, either queues function for deferred execution or
 721  *              immediately executes function on a separate thread.
 722  *
 723  ******************************************************************************/
 724
 725 static acpi_status __acpi_os_execute(acpi_execute_type type,
 726         acpi_osd_exec_callback function, void *context, int hp)
 727 {
 728         acpi_status status = AE_OK;
 729         struct acpi_os_dpc *dpc;
 730         struct workqueue_struct *queue;
 731         int ret;
 732         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 733                           "Scheduling function [%p(%p)] for deferred execution.\n",
 734                           function, context));
 735
 736         /*
 737          * Allocate/initialize DPC structure.  Note that this memory will be
 738          * freed by the callee.  The kernel handles the work_struct list  in a
 739          * way that allows us to also free its memory inside the callee.
 740          * Because we may want to schedule several tasks with different
 741          * parameters we can't use the approach some kernel code uses of
 742          * having a static work_struct.
 743          */
 744
 745         dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
 746         if (!dpc)
 747                 return AE_NO_MEMORY;
 748
 749         dpc->function = function;
 750         dpc->context = context;
 751
 752         /*
 753          * We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
 754          * because the hotplug code may call driver .remove() functions,
 755          * which invoke flush_scheduled_work/acpi_os_wait_events_complete
 756          * to flush these workqueues.
 757          */
 758         queue = hp ? kacpi_hotplug_wq :
 759                 (type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
 760         dpc->wait = hp ? 1 : 0;
 761         INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 762         ret = queue_work(queue, &dpc->work);
 763
 764         if (!ret) {
 765                 printk(KERN_ERR PREFIX
 766                           "Call to queue_work() failed.\n");
 767                 status = AE_ERROR;
 768                 kfree(dpc);
 769         }
 770         return status;
 771 }
 772
 773 acpi_status acpi_os_execute(acpi_execute_type type,
 774                             acpi_osd_exec_callback function, void *context)
 775 {
 776         return __acpi_os_execute(type, function, context, 0);
 777 }
 778 EXPORT_SYMBOL(acpi_os_execute);
 779
 780 acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
 781         void *context)
 782 {
 783         return __acpi_os_execute(0, function, context, 1);
 784 }
 785
 786 void acpi_os_wait_events_complete(void *context)
 787 {
 788         flush_workqueue(kacpid_wq);
 789         flush_workqueue(kacpi_notify_wq);
 790 }
 791
 792 EXPORT_SYMBOL(acpi_os_wait_events_complete);
 793
 794 /*
 795  * Allocate the memory for a spinlock and initialize it.
 796  */
 797 acpi_status acpi_os_create_lock(acpi_spinlock * handle)
 798 {
 799         spin_lock_init(*handle);
 800
 801         return AE_OK;
 802 }
 803
 804 /*
 805  * Deallocate the memory for a spinlock.
 806  */
 807 void acpi_os_delete_lock(acpi_spinlock handle)
 808 {
 809         return;
 810 }
 811
 812 acpi_status
 813 acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
 814 {
 815         struct semaphore *sem = NULL;
 816
 817         sem = acpi_os_allocate(sizeof(struct semaphore));
 818         if (!sem)
 819                 return AE_NO_MEMORY;
 820         memset(sem, 0, sizeof(struct semaphore));
 821
 822         sema_init(sem, initial_units);
 823
 824         *handle = (acpi_handle *) sem;
 825
 826         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
 827                           *handle, initial_units));
 828
 829         return AE_OK;
 830 }
 831
 832 /*
 833  * TODO: A better way to delete semaphores?  Linux doesn't have a
 834  * 'delete_semaphore()' function -- may result in an invalid
 835  * pointer dereference for non-synchronized consumers.  Should
 836  * we at least check for blocked threads and signal/cancel them?
 837  */
 838
 839 acpi_status acpi_os_delete_semaphore(acpi_handle handle)
 840 {
 841         struct semaphore *sem = (struct semaphore *)handle;
 842
 843         if (!sem)
 844                 return AE_BAD_PARAMETER;
 845
 846         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 847
 848         BUG_ON(!list_empty(&sem->wait_list));
 849         kfree(sem);
 850         sem = NULL;
 851
 852         return AE_OK;
 853 }
 854
 855 /*
 856  * TODO: Support for units > 1?
 857  */
 858 acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
 859 {
 860         acpi_status status = AE_OK;
 861         struct semaphore *sem = (struct semaphore *)handle;
 862         long jiffies;
 863         int ret = 0;
 864
 865         if (!sem || (units < 1))
 866                 return AE_BAD_PARAMETER;
 867
 868         if (units > 1)
 869                 return AE_SUPPORT;
 870
 871         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 872                           handle, units, timeout));
 873
 874         if (timeout == ACPI_WAIT_FOREVER)
 875                 jiffies = MAX_SCHEDULE_TIMEOUT;
 876         else
 877                 jiffies = msecs_to_jiffies(timeout);
 878
 879         ret = down_timeout(sem, jiffies);
 880         if (ret)
 881                 status = AE_TIME;
 882
 883         if (ACPI_FAILURE(status)) {
 884                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 885                                   "Failed to acquire semaphore[%p|%d|%d], %s",
 886                                   handle, units, timeout,
 887                                   acpi_format_exception(status)));
 888         } else {
 889                 ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
 890                                   "Acquired semaphore[%p|%d|%d]", handle,
 891                                   units, timeout));
 892         }
 893
 894         return status;
 895 }
 896
 897 /*
 898  * TODO: Support for units > 1?
 899  */
 900 acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
 901 {
 902         struct semaphore *sem = (struct semaphore *)handle;
 903
 904         if (!sem || (units < 1))
 905                 return AE_BAD_PARAMETER;
 906
 907         if (units > 1)
 908                 return AE_SUPPORT;
 909
 910         ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
 911                           units));
 912
 913         up(sem);
 914
 915         return AE_OK;
 916 }
 917
 918 #ifdef ACPI_FUTURE_USAGE
 919 u32 acpi_os_get_line(char *buffer)
 920 {
 921
 922 #ifdef ENABLE_DEBUGGER
 923         if (acpi_in_debugger) {
 924                 u32 chars;
 925
 926                 kdb_read(buffer, sizeof(line_buf));
 927
 928                 /* remove the CR kdb includes */
 929                 chars = strlen(buffer) - 1;
 930                 buffer[chars] = '\0';
 931         }
 932 #endif
 933
 934         return 0;
 935 }
 936 #endif                          /*  ACPI_FUTURE_USAGE  */
 937
 938 acpi_status acpi_os_signal(u32 function, void *info)
 939 {
 940         switch (function) {
 941         case ACPI_SIGNAL_FATAL:
 942                 printk(KERN_ERR PREFIX "Fatal opcode executed\n");
 943                 break;
 944         case ACPI_SIGNAL_BREAKPOINT:
 945                 /*
 946                  * AML Breakpoint
 947                  * ACPI spec. says to treat it as a NOP unless
 948                  * you are debugging.  So if/when we integrate
 949                  * AML debugger into the kernel debugger its
 950                  * hook will go here.  But until then it is
 951                  * not useful to print anything on breakpoints.
 952                  */
 953                 break;
 954         default:
 955                 break;
 956         }
 957
 958         return AE_OK;
 959 }
 960
 961 static int __init acpi_os_name_setup(char *str)
 962 {
 963         char *p = acpi_os_name;
 964         int count = ACPI_MAX_OVERRIDE_LEN - 1;
 965
 966         if (!str || !*str)
 967                 return 0;
 968
 969         for (; count-- && str && *str; str++) {
 970                 if (isalnum(*str) || *str == ' ' || *str == ':')
 971                         *p++ = *str;
 972                 else if (*str == '\'' || *str == '"')
 973                         continue;
 974                 else
 975                         break;
 976         }
 977         *p = 0;
 978
 979         return 1;
 980
 981 }
 982
 983 __setup("acpi_os_name=", acpi_os_name_setup);
 984
 985 static void __init set_osi_linux(unsigned int enable)
 986 {
 987         if (osi_linux.enable != enable) {
 988                 osi_linux.enable = enable;
 989                 printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
 990                         enable ? "Add": "Delet");
 991         }
 992         return;
 993 }
 994
 995 static void __init acpi_cmdline_osi_linux(unsigned int enable)
 996 {
 997         osi_linux.cmdline = 1;  /* cmdline set the default */
 998         set_osi_linux(enable);
 999
1000         return;
1001 }
1002
1003 void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
1004 {
1005         osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */
1006
1007         printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
1008
1009         if (enable == -1)
1010                 return;
1011
1012         osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */
1013
1014         set_osi_linux(enable);
1015
1016         return;
1017 }
1018
1019 /*
1020  * Modify the list of "OS Interfaces" reported to BIOS via _OSI
1021  *
1022  * empty string disables _OSI
1023  * string starting with '!' disables that string
1024  * otherwise string is added to list, augmenting built-in strings
1025  */
1026 int __init acpi_osi_setup(char *str)
1027 {
1028         if (str == NULL || *str == '\0') {
1029                 printk(KERN_INFO PREFIX "_OSI method disabled\n");
1030                 acpi_gbl_create_osi_method = FALSE;
1031         } else if (!strcmp("!Linux", str)) {
1032                 acpi_cmdline_osi_linux(0);      /* !enable */
1033         } else if (*str == '!') {
1034                 if (acpi_osi_invalidate(++str) == AE_OK)
1035                         printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
1036         } else if (!strcmp("Linux", str)) {
1037                 acpi_cmdline_osi_linux(1);      /* enable */
1038         } else if (*osi_additional_string == '\0') {
1039                 strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
1040                 printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
1041         }
1042
1043         return 1;
1044 }
1045
1046 __setup("acpi_osi=", acpi_osi_setup);
1047
1048 /* enable serialization to combat AE_ALREADY_EXISTS errors */
1049 static int __init acpi_serialize_setup(char *str)
1050 {
1051         printk(KERN_INFO PREFIX "serialize enabled\n");
1052
1053         acpi_gbl_all_methods_serialized = TRUE;
1054
1055         return 1;
1056 }
1057
1058 __setup("acpi_serialize", acpi_serialize_setup);
1059
1060 /*
1061  * Wake and Run-Time GPES are expected to be separate.
1062  * We disable wake-GPEs at run-time to prevent spurious
1063  * interrupts.
1064  *
1065  * However, if a system exists that shares Wake and
1066  * Run-time events on the same GPE this flag is available
1067  * to tell Linux to keep the wake-time GPEs enabled at run-time.
1068  */
1069 static int __init acpi_wake_gpes_always_on_setup(char *str)
1070 {
1071         printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
1072
1073         acpi_gbl_leave_wake_gpes_disabled = FALSE;
1074
1075         return 1;
1076 }
1077
1078 __setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);
1079
1080 /* Check of resource interference between native drivers and ACPI
1081  * OperationRegions (SystemIO and System Memory only).
1082  * IO ports and memory declared in ACPI might be used by the ACPI subsystem
1083  * in arbitrary AML code and can interfere with legacy drivers.
1084  * acpi_enforce_resources= can be set to:
1085  *
1086  *   - strict (default) (2)
1087  *     -> further driver trying to access the resources will not load
1088  *   - lax              (1)
1089  *     -> further driver trying to access the resources will load, but you
1090  *     get a system message that something might go wrong...
1091  *
1092  *   - no               (0)
1093  *     -> ACPI Operation Region resources will not be registered
1094  *
1095  */
1096 #define ENFORCE_RESOURCES_STRICT 2
1097 #define ENFORCE_RESOURCES_LAX    1
1098 #define ENFORCE_RESOURCES_NO     0
1099
1100 static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1101
1102 static int __init acpi_enforce_resources_setup(char *str)
1103 {
1104         if (str == NULL || *str == '\0')
1105                 return 0;
1106
1107         if (!strcmp("strict", str))
1108                 acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
1109         else if (!strcmp("lax", str))
1110                 acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
1111         else if (!strcmp("no", str))
1112                 acpi_enforce_resources = ENFORCE_RESOURCES_NO;
1113
1114         return 1;
1115 }
1116
1117 __setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
1118
1119 /* Check for resource conflicts between ACPI OperationRegions and native
1120  * drivers */
1121 int acpi_check_resource_conflict(struct resource *res)
1122 {
1123         struct acpi_res_list *res_list_elem;
1124         int ioport;
1125         int clash = 0;
1126
1127         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1128                 return 0;
1129         if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
1130                 return 0;
1131
1132         ioport = res->flags & IORESOURCE_IO;
1133
1134         spin_lock(&acpi_res_lock);
1135         list_for_each_entry(res_list_elem, &resource_list_head,
1136                             resource_list) {
1137                 if (ioport && (res_list_elem->resource_type
1138                                != ACPI_ADR_SPACE_SYSTEM_IO))
1139                         continue;
1140                 if (!ioport && (res_list_elem->resource_type
1141                                 != ACPI_ADR_SPACE_SYSTEM_MEMORY))
1142                         continue;
1143
1144                 if (res->end < res_list_elem->start
1145                     || res_list_elem->end < res->start)
1146                         continue;
1147                 clash = 1;
1148                 break;
1149         }
1150         spin_unlock(&acpi_res_lock);
1151
1152         if (clash) {
1153                 if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
1154                         printk("%sACPI: %s resource %s [0x%llx-0x%llx]"
1155                                " conflicts with ACPI region %s"
1156                                " [0x%llx-0x%llx]\n",
1157                                acpi_enforce_resources == ENFORCE_RESOURCES_LAX
1158                                ? KERN_WARNING : KERN_ERR,
1159                                ioport ? "I/O" : "Memory", res->name,
1160                                (long long) res->start, (long long) res->end,
1161                                res_list_elem->name,
1162                                (long long) res_list_elem->start,
1163                                (long long) res_list_elem->end);
1164                         printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
1165                 }
1166                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
1167                         return -EBUSY;
1168         }
1169         return 0;
1170 }
1171 EXPORT_SYMBOL(acpi_check_resource_conflict);
1172
1173 int acpi_check_region(resource_size_t start, resource_size_t n,
1174                       const char *name)
1175 {
1176         struct resource res = {
1177                 .start = start,
1178                 .end   = start + n - 1,
1179                 .name  = name,
1180                 .flags = IORESOURCE_IO,
1181         };
1182
1183         return acpi_check_resource_conflict(&res);
1184 }
1185 EXPORT_SYMBOL(acpi_check_region);
1186
1187 int acpi_check_mem_region(resource_size_t start, resource_size_t n,
1188                       const char *name)
1189 {
1190         struct resource res = {
1191                 .start = start,
1192                 .end   = start + n - 1,
1193                 .name  = name,
1194                 .flags = IORESOURCE_MEM,
1195         };
1196
1197         return acpi_check_resource_conflict(&res);
1198
1199 }
1200 EXPORT_SYMBOL(acpi_check_mem_region);
1201
1202 /*
1203  * Acquire a spinlock.
1204  *
1205  * handle is a pointer to the spinlock_t.
1206  */
1207
1208 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
1209 {
1210         acpi_cpu_flags flags;
1211         spin_lock_irqsave(lockp, flags);
1212         return flags;
1213 }
1214
1215 /*
1216  * Release a spinlock. See above.
1217  */
1218
1219 void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
1220 {
1221         spin_unlock_irqrestore(lockp, flags);
1222 }
1223
1224 #ifndef ACPI_USE_LOCAL_CACHE
1225
1226 /*******************************************************************************
1227  *
1228  * FUNCTION:    acpi_os_create_cache
1229  *
1230  * PARAMETERS:  name      - Ascii name for the cache
1231  *              size      - Size of each cached object
1232  *              depth     - Maximum depth of the cache (in objects) <ignored>
1233  *              cache     - Where the new cache object is returned
1234  *
1235  * RETURN:      status
1236  *
1237  * DESCRIPTION: Create a cache object
1238  *
1239  ******************************************************************************/
1240
1241 acpi_status
1242 acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
1243 {
1244         *cache = kmem_cache_create(name, size, 0, 0, NULL);
1245         if (*cache == NULL)
1246                 return AE_ERROR;
1247         else
1248                 return AE_OK;
1249 }
1250
1251 /*******************************************************************************
1252  *
1253  * FUNCTION:    acpi_os_purge_cache
1254  *
1255  * PARAMETERS:  Cache           - Handle to cache object
1256  *
1257  * RETURN:      Status
1258  *
1259  * DESCRIPTION: Free all objects within the requested cache.
1260  *
1261  ******************************************************************************/
1262
1263 acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
1264 {
1265         kmem_cache_shrink(cache);
1266         return (AE_OK);
1267 }
1268
1269 /*******************************************************************************
1270  *
1271  * FUNCTION:    acpi_os_delete_cache
1272  *
1273  * PARAMETERS:  Cache           - Handle to cache object
1274  *
1275  * RETURN:      Status
1276  *
1277  * DESCRIPTION: Free all objects within the requested cache and delete the
1278  *              cache object.
1279  *
1280  ******************************************************************************/
1281
1282 acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
1283 {
1284         kmem_cache_destroy(cache);
1285         return (AE_OK);
1286 }
1287
1288 /*******************************************************************************
1289  *
1290  * FUNCTION:    acpi_os_release_object
1291  *
1292  * PARAMETERS:  Cache       - Handle to cache object
1293  *              Object      - The object to be released
1294  *
1295  * RETURN:      None
1296  *
1297  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
1298  *              the object is deleted.
1299  *
1300  ******************************************************************************/
1301
1302 acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
1303 {
1304         kmem_cache_free(cache, object);
1305         return (AE_OK);
1306 }
1307
1308 /******************************************************************************
1309  *
1310  * FUNCTION:    acpi_os_validate_interface
1311  *
1312  * PARAMETERS:  interface           - Requested interface to be validated
1313  *
1314  * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
1315  *
1316  * DESCRIPTION: Match an interface string to the interfaces supported by the
1317  *              host. Strings originate from an AML call to the _OSI method.
1318  *
1319  *****************************************************************************/
1320
1321 acpi_status
1322 acpi_os_validate_interface (char *interface)
1323 {
1324         if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
1325                 return AE_OK;
1326         if (!strcmp("Linux", interface)) {
1327
1328                 printk(KERN_NOTICE PREFIX
1329                         "BIOS _OSI(Linux) query %s%s\n",
1330                         osi_linux.enable ? "honored" : "ignored",
1331                         osi_linux.cmdline ? " via cmdline" :
1332                         osi_linux.dmi ? " via DMI" : "");
1333
1334                 if (osi_linux.enable)
1335                         return AE_OK;
1336         }
1337         return AE_SUPPORT;
1338 }
1339
1340 static inline int acpi_res_list_add(struct acpi_res_list *res)
1341 {
1342         struct acpi_res_list *res_list_elem;
1343
1344         list_for_each_entry(res_list_elem, &resource_list_head,
1345                             resource_list) {
1346
1347                 if (res->resource_type == res_list_elem->resource_type &&
1348                     res->start == res_list_elem->start &&
1349                     res->end == res_list_elem->end) {
1350
1351                         /*
1352                          * The Region(addr,len) already exist in the list,
1353                          * just increase the count
1354                          */
1355
1356                         res_list_elem->count++;
1357                         return 0;
1358                 }
1359         }
1360
1361         res->count = 1;
1362         list_add(&res->resource_list, &resource_list_head);
1363         return 1;
1364 }
1365
1366 static inline void acpi_res_list_del(struct acpi_res_list *res)
1367 {
1368         struct acpi_res_list *res_list_elem;
1369
1370         list_for_each_entry(res_list_elem, &resource_list_head,
1371                             resource_list) {
1372
1373                 if (res->resource_type == res_list_elem->resource_type &&
1374                     res->start == res_list_elem->start &&
1375                     res->end == res_list_elem->end) {
1376
1377                         /*
1378                          * If the res count is decreased to 0,
1379                          * remove and free it
1380                          */
1381
1382                         if (--res_list_elem->count == 0) {
1383                                 list_del(&res_list_elem->resource_list);
1384                                 kfree(res_list_elem);
1385                         }
1386                         return;
1387                 }
1388         }
1389 }
1390
1391 acpi_status
1392 acpi_os_invalidate_address(
1393     u8                   space_id,
1394     acpi_physical_address   address,
1395     acpi_size               length)
1396 {
1397         struct acpi_res_list res;
1398
1399         switch (space_id) {
1400         case ACPI_ADR_SPACE_SYSTEM_IO:
1401         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1402                 /* Only interference checks against SystemIO and SytemMemory
1403                    are needed */
1404                 res.start = address;
1405                 res.end = address + length - 1;
1406                 res.resource_type = space_id;
1407                 spin_lock(&acpi_res_lock);
1408                 acpi_res_list_del(&res);
1409                 spin_unlock(&acpi_res_lock);
1410                 break;
1411         case ACPI_ADR_SPACE_PCI_CONFIG:
1412         case ACPI_ADR_SPACE_EC:
1413         case ACPI_ADR_SPACE_SMBUS:
1414         case ACPI_ADR_SPACE_CMOS:
1415         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1416         case ACPI_ADR_SPACE_DATA_TABLE:
1417         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1418                 break;
1419         }
1420         return AE_OK;
1421 }
1422
1423 /******************************************************************************
1424  *
1425  * FUNCTION:    acpi_os_validate_address
1426  *
1427  * PARAMETERS:  space_id             - ACPI space ID
1428  *              address             - Physical address
1429  *              length              - Address length
1430  *
1431  * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
1432  *              should return AE_AML_ILLEGAL_ADDRESS.
1433  *
1434  * DESCRIPTION: Validate a system address via the host OS. Used to validate
1435  *              the addresses accessed by AML operation regions.
1436  *
1437  *****************************************************************************/
1438
1439 acpi_status
1440 acpi_os_validate_address (
1441     u8                   space_id,
1442     acpi_physical_address   address,
1443     acpi_size               length,
1444     char *name)
1445 {
1446         struct acpi_res_list *res;
1447         int added;
1448         if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
1449                 return AE_OK;
1450
1451         switch (space_id) {
1452         case ACPI_ADR_SPACE_SYSTEM_IO:
1453         case ACPI_ADR_SPACE_SYSTEM_MEMORY:
1454                 /* Only interference checks against SystemIO and SytemMemory
1455                    are needed */
1456                 res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
1457                 if (!res)
1458                         return AE_OK;
1459                 /* ACPI names are fixed to 4 bytes, still better use strlcpy */
1460                 strlcpy(res->name, name, 5);
1461                 res->start = address;
1462                 res->end = address + length - 1;
1463                 res->resource_type = space_id;
1464                 spin_lock(&acpi_res_lock);
1465                 added = acpi_res_list_add(res);
1466                 spin_unlock(&acpi_res_lock);
1467                 pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
1468                          "name: %s\n", added ? "Added" : "Already exist",
1469                          (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
1470                          ? "SystemIO" : "System Memory",
1471                          (unsigned long long)res->start,
1472                          (unsigned long long)res->end,
1473                          res->name);
1474                 if (!added)
1475                         kfree(res);
1476                 break;
1477         case ACPI_ADR_SPACE_PCI_CONFIG:
1478         case ACPI_ADR_SPACE_EC:
1479         case ACPI_ADR_SPACE_SMBUS:
1480         case ACPI_ADR_SPACE_CMOS:
1481         case ACPI_ADR_SPACE_PCI_BAR_TARGET:
1482         case ACPI_ADR_SPACE_DATA_TABLE:
1483         case ACPI_ADR_SPACE_FIXED_HARDWARE:
1484                 break;
1485         }
1486         return AE_OK;
1487 }
1488
1489 #endif