drivers/acpi/acpica/utxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: utxface - External interfaces for "global" ACPI functions
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2012, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <linux/export.h>
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acevents.h"
  48 #include "acnamesp.h"
  49 #include "acdebug.h"
  50 #include "actables.h"
  51 #include "acinterp.h"
  52
  53 #define _COMPONENT          ACPI_UTILITIES
  54 ACPI_MODULE_NAME("utxface")
  55
  56 #ifndef ACPI_ASL_COMPILER
  57 /*******************************************************************************
  58  *
  59  * FUNCTION:    acpi_initialize_subsystem
  60  *
  61  * PARAMETERS:  None
  62  *
  63  * RETURN:      Status
  64  *
  65  * DESCRIPTION: Initializes all global variables.  This is the first function
  66  *              called, so any early initialization belongs here.
  67  *
  68  ******************************************************************************/
  69 acpi_status __init acpi_initialize_subsystem(void)
  70 {
  71         acpi_status status;
  72
  73         ACPI_FUNCTION_TRACE(acpi_initialize_subsystem);
  74
  75         acpi_gbl_startup_flags = ACPI_SUBSYSTEM_INITIALIZE;
  76         ACPI_DEBUG_EXEC(acpi_ut_init_stack_ptr_trace());
  77
  78         /* Initialize the OS-Dependent layer */
  79
  80         status = acpi_os_initialize();
  81         if (ACPI_FAILURE(status)) {
  82                 ACPI_EXCEPTION((AE_INFO, status, "During OSL initialization"));
  83                 return_ACPI_STATUS(status);
  84         }
  85
  86         /* Initialize all globals used by the subsystem */
  87
  88         status = acpi_ut_init_globals();
  89         if (ACPI_FAILURE(status)) {
  90                 ACPI_EXCEPTION((AE_INFO, status,
  91                                 "During initialization of globals"));
  92                 return_ACPI_STATUS(status);
  93         }
  94
  95         /* Create the default mutex objects */
  96
  97         status = acpi_ut_mutex_initialize();
  98         if (ACPI_FAILURE(status)) {
  99                 ACPI_EXCEPTION((AE_INFO, status,
 100                                 "During Global Mutex creation"));
 101                 return_ACPI_STATUS(status);
 102         }
 103
 104         /*
 105          * Initialize the namespace manager and
 106          * the root of the namespace tree
 107          */
 108         status = acpi_ns_root_initialize();
 109         if (ACPI_FAILURE(status)) {
 110                 ACPI_EXCEPTION((AE_INFO, status,
 111                                 "During Namespace initialization"));
 112                 return_ACPI_STATUS(status);
 113         }
 114
 115         /* Initialize the global OSI interfaces list with the static names */
 116
 117         status = acpi_ut_initialize_interfaces();
 118         if (ACPI_FAILURE(status)) {
 119                 ACPI_EXCEPTION((AE_INFO, status,
 120                                 "During OSI interfaces initialization"));
 121                 return_ACPI_STATUS(status);
 122         }
 123
 124         /* If configured, initialize the AML debugger */
 125
 126         ACPI_DEBUGGER_EXEC(status = acpi_db_initialize());
 127         return_ACPI_STATUS(status);
 128 }
 129
 130 /*******************************************************************************
 131  *
 132  * FUNCTION:    acpi_enable_subsystem
 133  *
 134  * PARAMETERS:  Flags           - Init/enable Options
 135  *
 136  * RETURN:      Status
 137  *
 138  * DESCRIPTION: Completes the subsystem initialization including hardware.
 139  *              Puts system into ACPI mode if it isn't already.
 140  *
 141  ******************************************************************************/
 142 acpi_status acpi_enable_subsystem(u32 flags)
 143 {
 144         acpi_status status = AE_OK;
 145
 146         ACPI_FUNCTION_TRACE(acpi_enable_subsystem);
 147
 148         /* Enable ACPI mode */
 149
 150         if (!(flags & ACPI_NO_ACPI_ENABLE)) {
 151                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 152                                   "[Init] Going into ACPI mode\n"));
 153
 154                 acpi_gbl_original_mode = acpi_hw_get_mode();
 155
 156                 status = acpi_enable();
 157                 if (ACPI_FAILURE(status)) {
 158                         ACPI_WARNING((AE_INFO, "AcpiEnable failed"));
 159                         return_ACPI_STATUS(status);
 160                 }
 161         }
 162
 163         /*
 164          * Obtain a permanent mapping for the FACS. This is required for the
 165          * Global Lock and the Firmware Waking Vector
 166          */
 167         status = acpi_tb_initialize_facs();
 168         if (ACPI_FAILURE(status)) {
 169                 ACPI_WARNING((AE_INFO, "Could not map the FACS table"));
 170                 return_ACPI_STATUS(status);
 171         }
 172
 173         /*
 174          * Install the default op_region handlers. These are installed unless
 175          * other handlers have already been installed via the
 176          * install_address_space_handler interface.
 177          */
 178         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
 179                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 180                                   "[Init] Installing default address space handlers\n"));
 181
 182                 status = acpi_ev_install_region_handlers();
 183                 if (ACPI_FAILURE(status)) {
 184                         return_ACPI_STATUS(status);
 185                 }
 186         }
 187
 188         /*
 189          * Initialize ACPI Event handling (Fixed and General Purpose)
 190          *
 191          * Note1: We must have the hardware and events initialized before we can
 192          * execute any control methods safely. Any control method can require
 193          * ACPI hardware support, so the hardware must be fully initialized before
 194          * any method execution!
 195          *
 196          * Note2: Fixed events are initialized and enabled here. GPEs are
 197          * initialized, but cannot be enabled until after the hardware is
 198          * completely initialized (SCI and global_lock activated)
 199          */
 200         if (!(flags & ACPI_NO_EVENT_INIT)) {
 201                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 202                                   "[Init] Initializing ACPI events\n"));
 203
 204                 status = acpi_ev_initialize_events();
 205                 if (ACPI_FAILURE(status)) {
 206                         return_ACPI_STATUS(status);
 207                 }
 208         }
 209
 210         /*
 211          * Install the SCI handler and Global Lock handler. This completes the
 212          * hardware initialization.
 213          */
 214         if (!(flags & ACPI_NO_HANDLER_INIT)) {
 215                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 216                                   "[Init] Installing SCI/GL handlers\n"));
 217
 218                 status = acpi_ev_install_xrupt_handlers();
 219                 if (ACPI_FAILURE(status)) {
 220                         return_ACPI_STATUS(status);
 221                 }
 222         }
 223
 224         return_ACPI_STATUS(status);
 225 }
 226
 227 ACPI_EXPORT_SYMBOL(acpi_enable_subsystem)
 228
 229 /*******************************************************************************
 230  *
 231  * FUNCTION:    acpi_initialize_objects
 232  *
 233  * PARAMETERS:  Flags           - Init/enable Options
 234  *
 235  * RETURN:      Status
 236  *
 237  * DESCRIPTION: Completes namespace initialization by initializing device
 238  *              objects and executing AML code for Regions, buffers, etc.
 239  *
 240  ******************************************************************************/
 241 acpi_status acpi_initialize_objects(u32 flags)
 242 {
 243         acpi_status status = AE_OK;
 244
 245         ACPI_FUNCTION_TRACE(acpi_initialize_objects);
 246
 247         /*
 248          * Run all _REG methods
 249          *
 250          * Note: Any objects accessed by the _REG methods will be automatically
 251          * initialized, even if they contain executable AML (see the call to
 252          * acpi_ns_initialize_objects below).
 253          */
 254         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
 255                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 256                                   "[Init] Executing _REG OpRegion methods\n"));
 257
 258                 status = acpi_ev_initialize_op_regions();
 259                 if (ACPI_FAILURE(status)) {
 260                         return_ACPI_STATUS(status);
 261                 }
 262         }
 263
 264         /*
 265          * Execute any module-level code that was detected during the table load
 266          * phase. Although illegal since ACPI 2.0, there are many machines that
 267          * contain this type of code. Each block of detected executable AML code
 268          * outside of any control method is wrapped with a temporary control
 269          * method object and placed on a global list. The methods on this list
 270          * are executed below.
 271          */
 272         acpi_ns_exec_module_code_list();
 273
 274         /*
 275          * Initialize the objects that remain uninitialized. This runs the
 276          * executable AML that may be part of the declaration of these objects:
 277          * operation_regions, buffer_fields, Buffers, and Packages.
 278          */
 279         if (!(flags & ACPI_NO_OBJECT_INIT)) {
 280                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 281                                   "[Init] Completing Initialization of ACPI Objects\n"));
 282
 283                 status = acpi_ns_initialize_objects();
 284                 if (ACPI_FAILURE(status)) {
 285                         return_ACPI_STATUS(status);
 286                 }
 287         }
 288
 289         /*
 290          * Initialize all device objects in the namespace. This runs the device
 291          * _STA and _INI methods.
 292          */
 293         if (!(flags & ACPI_NO_DEVICE_INIT)) {
 294                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 295                                   "[Init] Initializing ACPI Devices\n"));
 296
 297                 status = acpi_ns_initialize_devices();
 298                 if (ACPI_FAILURE(status)) {
 299                         return_ACPI_STATUS(status);
 300                 }
 301         }
 302
 303         /*
 304          * Empty the caches (delete the cached objects) on the assumption that
 305          * the table load filled them up more than they will be at runtime --
 306          * thus wasting non-paged memory.
 307          */
 308         status = acpi_purge_cached_objects();
 309
 310         acpi_gbl_startup_flags |= ACPI_INITIALIZED_OK;
 311         return_ACPI_STATUS(status);
 312 }
 313
 314 ACPI_EXPORT_SYMBOL(acpi_initialize_objects)
 315
 316 #endif
 317 /*******************************************************************************
 318  *
 319  * FUNCTION:    acpi_terminate
 320  *
 321  * PARAMETERS:  None
 322  *
 323  * RETURN:      Status
 324  *
 325  * DESCRIPTION: Shutdown the ACPICA subsystem and release all resources.
 326  *
 327  ******************************************************************************/
 328 acpi_status acpi_terminate(void)
 329 {
 330         acpi_status status;
 331
 332         ACPI_FUNCTION_TRACE(acpi_terminate);
 333
 334         /* Just exit if subsystem is already shutdown */
 335
 336         if (acpi_gbl_shutdown) {
 337                 ACPI_ERROR((AE_INFO, "ACPI Subsystem is already terminated"));
 338                 return_ACPI_STATUS(AE_OK);
 339         }
 340
 341         /* Subsystem appears active, go ahead and shut it down */
 342
 343         acpi_gbl_shutdown = TRUE;
 344         acpi_gbl_startup_flags = 0;
 345         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Shutting down ACPI Subsystem\n"));
 346
 347         /* Terminate the AML Debugger if present */
 348
 349         ACPI_DEBUGGER_EXEC(acpi_gbl_db_terminate_threads = TRUE);
 350
 351         /* Shutdown and free all resources */
 352
 353         acpi_ut_subsystem_shutdown();
 354
 355         /* Free the mutex objects */
 356
 357         acpi_ut_mutex_terminate();
 358
 359 #ifdef ACPI_DEBUGGER
 360
 361         /* Shut down the debugger */
 362
 363         acpi_db_terminate();
 364 #endif
 365
 366         /* Now we can shutdown the OS-dependent layer */
 367
 368         status = acpi_os_terminate();
 369         return_ACPI_STATUS(status);
 370 }
 371
 372 ACPI_EXPORT_SYMBOL(acpi_terminate)
 373
 374 #ifndef ACPI_ASL_COMPILER
 375 #ifdef ACPI_FUTURE_USAGE
 376 /*******************************************************************************
 377  *
 378  * FUNCTION:    acpi_subsystem_status
 379  *
 380  * PARAMETERS:  None
 381  *
 382  * RETURN:      Status of the ACPI subsystem
 383  *
 384  * DESCRIPTION: Other drivers that use the ACPI subsystem should call this
 385  *              before making any other calls, to ensure the subsystem
 386  *              initialized successfully.
 387  *
 388  ******************************************************************************/
 389 acpi_status acpi_subsystem_status(void)
 390 {
 391
 392         if (acpi_gbl_startup_flags & ACPI_INITIALIZED_OK) {
 393                 return (AE_OK);
 394         } else {
 395                 return (AE_ERROR);
 396         }
 397 }
 398
 399 ACPI_EXPORT_SYMBOL(acpi_subsystem_status)
 400
 401 /*******************************************************************************
 402  *
 403  * FUNCTION:    acpi_get_system_info
 404  *
 405  * PARAMETERS:  out_buffer      - A buffer to receive the resources for the
 406  *                                device
 407  *
 408  * RETURN:      Status          - the status of the call
 409  *
 410  * DESCRIPTION: This function is called to get information about the current
 411  *              state of the ACPI subsystem.  It will return system information
 412  *              in the out_buffer.
 413  *
 414  *              If the function fails an appropriate status will be returned
 415  *              and the value of out_buffer is undefined.
 416  *
 417  ******************************************************************************/
 418 acpi_status acpi_get_system_info(struct acpi_buffer * out_buffer)
 419 {
 420         struct acpi_system_info *info_ptr;
 421         acpi_status status;
 422
 423         ACPI_FUNCTION_TRACE(acpi_get_system_info);
 424
 425         /* Parameter validation */
 426
 427         status = acpi_ut_validate_buffer(out_buffer);
 428         if (ACPI_FAILURE(status)) {
 429                 return_ACPI_STATUS(status);
 430         }
 431
 432         /* Validate/Allocate/Clear caller buffer */
 433
 434         status =
 435             acpi_ut_initialize_buffer(out_buffer,
 436                                       sizeof(struct acpi_system_info));
 437         if (ACPI_FAILURE(status)) {
 438                 return_ACPI_STATUS(status);
 439         }
 440
 441         /*
 442          * Populate the return buffer
 443          */
 444         info_ptr = (struct acpi_system_info *)out_buffer->pointer;
 445
 446         info_ptr->acpi_ca_version = ACPI_CA_VERSION;
 447
 448         /* System flags (ACPI capabilities) */
 449
 450         info_ptr->flags = ACPI_SYS_MODE_ACPI;
 451
 452         /* Timer resolution - 24 or 32 bits  */
 453
 454         if (acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER) {
 455                 info_ptr->timer_resolution = 24;
 456         } else {
 457                 info_ptr->timer_resolution = 32;
 458         }
 459
 460         /* Clear the reserved fields */
 461
 462         info_ptr->reserved1 = 0;
 463         info_ptr->reserved2 = 0;
 464
 465         /* Current debug levels */
 466
 467         info_ptr->debug_layer = acpi_dbg_layer;
 468         info_ptr->debug_level = acpi_dbg_level;
 469
 470         return_ACPI_STATUS(AE_OK);
 471 }
 472
 473 ACPI_EXPORT_SYMBOL(acpi_get_system_info)
 474
 475 /*****************************************************************************
 476  *
 477  * FUNCTION:    acpi_install_initialization_handler
 478  *
 479  * PARAMETERS:  Handler             - Callback procedure
 480  *              Function            - Not (currently) used, see below
 481  *
 482  * RETURN:      Status
 483  *
 484  * DESCRIPTION: Install an initialization handler
 485  *
 486  * TBD: When a second function is added, must save the Function also.
 487  *
 488  ****************************************************************************/
 489 acpi_status
 490 acpi_install_initialization_handler(acpi_init_handler handler, u32 function)
 491 {
 492
 493         if (!handler) {
 494                 return (AE_BAD_PARAMETER);
 495         }
 496
 497         if (acpi_gbl_init_handler) {
 498                 return (AE_ALREADY_EXISTS);
 499         }
 500
 501         acpi_gbl_init_handler = handler;
 502         return AE_OK;
 503 }
 504
 505 ACPI_EXPORT_SYMBOL(acpi_install_initialization_handler)
 506 #endif                          /*  ACPI_FUTURE_USAGE  */
 507
 508 /*****************************************************************************
 509  *
 510  * FUNCTION:    acpi_purge_cached_objects
 511  *
 512  * PARAMETERS:  None
 513  *
 514  * RETURN:      Status
 515  *
 516  * DESCRIPTION: Empty all caches (delete the cached objects)
 517  *
 518  ****************************************************************************/
 519 acpi_status acpi_purge_cached_objects(void)
 520 {
 521         ACPI_FUNCTION_TRACE(acpi_purge_cached_objects);
 522
 523         (void)acpi_os_purge_cache(acpi_gbl_state_cache);
 524         (void)acpi_os_purge_cache(acpi_gbl_operand_cache);
 525         (void)acpi_os_purge_cache(acpi_gbl_ps_node_cache);
 526         (void)acpi_os_purge_cache(acpi_gbl_ps_node_ext_cache);
 527         return_ACPI_STATUS(AE_OK);
 528 }
 529
 530 ACPI_EXPORT_SYMBOL(acpi_purge_cached_objects)
 531
 532 /*****************************************************************************
 533  *
 534  * FUNCTION:    acpi_install_interface
 535  *
 536  * PARAMETERS:  interface_name      - The interface to install
 537  *
 538  * RETURN:      Status
 539  *
 540  * DESCRIPTION: Install an _OSI interface to the global list
 541  *
 542  ****************************************************************************/
 543 acpi_status acpi_install_interface(acpi_string interface_name)
 544 {
 545         acpi_status status;
 546         struct acpi_interface_info *interface_info;
 547
 548         /* Parameter validation */
 549
 550         if (!interface_name || (ACPI_STRLEN(interface_name) == 0)) {
 551                 return (AE_BAD_PARAMETER);
 552         }
 553
 554         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 555
 556         /* Check if the interface name is already in the global list */
 557
 558         interface_info = acpi_ut_get_interface(interface_name);
 559         if (interface_info) {
 560                 /*
 561                  * The interface already exists in the list. This is OK if the
 562                  * interface has been marked invalid -- just clear the bit.
 563                  */
 564                 if (interface_info->flags & ACPI_OSI_INVALID) {
 565                         interface_info->flags &= ~ACPI_OSI_INVALID;
 566                         status = AE_OK;
 567                 } else {
 568                         status = AE_ALREADY_EXISTS;
 569                 }
 570         } else {
 571                 /* New interface name, install into the global list */
 572
 573                 status = acpi_ut_install_interface(interface_name);
 574         }
 575
 576         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 577         return (status);
 578 }
 579
 580 ACPI_EXPORT_SYMBOL(acpi_install_interface)
 581
 582 /*****************************************************************************
 583  *
 584  * FUNCTION:    acpi_remove_interface
 585  *
 586  * PARAMETERS:  interface_name      - The interface to remove
 587  *
 588  * RETURN:      Status
 589  *
 590  * DESCRIPTION: Remove an _OSI interface from the global list
 591  *
 592  ****************************************************************************/
 593 acpi_status acpi_remove_interface(acpi_string interface_name)
 594 {
 595         acpi_status status;
 596
 597         /* Parameter validation */
 598
 599         if (!interface_name || (ACPI_STRLEN(interface_name) == 0)) {
 600                 return (AE_BAD_PARAMETER);
 601         }
 602
 603         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 604
 605         status = acpi_ut_remove_interface(interface_name);
 606
 607         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 608         return (status);
 609 }
 610
 611 ACPI_EXPORT_SYMBOL(acpi_remove_interface)
 612
 613 /*****************************************************************************
 614  *
 615  * FUNCTION:    acpi_install_interface_handler
 616  *
 617  * PARAMETERS:  Handler             - The _OSI interface handler to install
 618  *                                    NULL means "remove existing handler"
 619  *
 620  * RETURN:      Status
 621  *
 622  * DESCRIPTION: Install a handler for the predefined _OSI ACPI method.
 623  *              invoked during execution of the internal implementation of
 624  *              _OSI. A NULL handler simply removes any existing handler.
 625  *
 626  ****************************************************************************/
 627 acpi_status acpi_install_interface_handler(acpi_interface_handler handler)
 628 {
 629         acpi_status status = AE_OK;
 630
 631         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 632
 633         if (handler && acpi_gbl_interface_handler) {
 634                 status = AE_ALREADY_EXISTS;
 635         } else {
 636                 acpi_gbl_interface_handler = handler;
 637         }
 638
 639         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 640         return (status);
 641 }
 642
 643 ACPI_EXPORT_SYMBOL(acpi_install_interface_handler)
 644
 645 /*****************************************************************************
 646  *
 647  * FUNCTION:    acpi_check_address_range
 648  *
 649  * PARAMETERS:  space_id            - Address space ID
 650  *              Address             - Start address
 651  *              Length              - Length
 652  *              Warn                - TRUE if warning on overlap desired
 653  *
 654  * RETURN:      Count of the number of conflicts detected.
 655  *
 656  * DESCRIPTION: Check if the input address range overlaps any of the
 657  *              ASL operation region address ranges.
 658  *
 659  ****************************************************************************/
 660 u32
 661 acpi_check_address_range(acpi_adr_space_type space_id,
 662                          acpi_physical_address address,
 663                          acpi_size length, u8 warn)
 664 {
 665         u32 overlaps;
 666         acpi_status status;
 667
 668         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 669         if (ACPI_FAILURE(status)) {
 670                 return (0);
 671         }
 672
 673         overlaps = acpi_ut_check_address_range(space_id, address,
 674                                                (u32)length, warn);
 675
 676         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 677         return (overlaps);
 678 }
 679
 680 ACPI_EXPORT_SYMBOL(acpi_check_address_range)
 681 #endif                          /* !ACPI_ASL_COMPILER */