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 - 2011, 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
  52 #define _COMPONENT          ACPI_UTILITIES
  53 ACPI_MODULE_NAME("utxface")
  54
  55 #ifndef ACPI_ASL_COMPILER
  56 /*******************************************************************************
  57  *
  58  * FUNCTION:    acpi_initialize_subsystem
  59  *
  60  * PARAMETERS:  None
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: Initializes all global variables.  This is the first function
  65  *              called, so any early initialization belongs here.
  66  *
  67  ******************************************************************************/
  68 acpi_status __init acpi_initialize_subsystem(void)
  69 {
  70         acpi_status status;
  71
  72         ACPI_FUNCTION_TRACE(acpi_initialize_subsystem);
  73
  74         acpi_gbl_startup_flags = ACPI_SUBSYSTEM_INITIALIZE;
  75         ACPI_DEBUG_EXEC(acpi_ut_init_stack_ptr_trace());
  76
  77         /* Initialize the OS-Dependent layer */
  78
  79         status = acpi_os_initialize();
  80         if (ACPI_FAILURE(status)) {
  81                 ACPI_EXCEPTION((AE_INFO, status, "During OSL initialization"));
  82                 return_ACPI_STATUS(status);
  83         }
  84
  85         /* Initialize all globals used by the subsystem */
  86
  87         status = acpi_ut_init_globals();
  88         if (ACPI_FAILURE(status)) {
  89                 ACPI_EXCEPTION((AE_INFO, status,
  90                                 "During initialization of globals"));
  91                 return_ACPI_STATUS(status);
  92         }
  93
  94         /* Create the default mutex objects */
  95
  96         status = acpi_ut_mutex_initialize();
  97         if (ACPI_FAILURE(status)) {
  98                 ACPI_EXCEPTION((AE_INFO, status,
  99                                 "During Global Mutex creation"));
 100                 return_ACPI_STATUS(status);
 101         }
 102
 103         /*
 104          * Initialize the namespace manager and
 105          * the root of the namespace tree
 106          */
 107         status = acpi_ns_root_initialize();
 108         if (ACPI_FAILURE(status)) {
 109                 ACPI_EXCEPTION((AE_INFO, status,
 110                                 "During Namespace initialization"));
 111                 return_ACPI_STATUS(status);
 112         }
 113
 114         /* Initialize the global OSI interfaces list with the static names */
 115
 116         status = acpi_ut_initialize_interfaces();
 117         if (ACPI_FAILURE(status)) {
 118                 ACPI_EXCEPTION((AE_INFO, status,
 119                                 "During OSI interfaces initialization"));
 120                 return_ACPI_STATUS(status);
 121         }
 122
 123         /* If configured, initialize the AML debugger */
 124
 125         ACPI_DEBUGGER_EXEC(status = acpi_db_initialize());
 126         return_ACPI_STATUS(status);
 127 }
 128
 129 /*******************************************************************************
 130  *
 131  * FUNCTION:    acpi_enable_subsystem
 132  *
 133  * PARAMETERS:  Flags           - Init/enable Options
 134  *
 135  * RETURN:      Status
 136  *
 137  * DESCRIPTION: Completes the subsystem initialization including hardware.
 138  *              Puts system into ACPI mode if it isn't already.
 139  *
 140  ******************************************************************************/
 141 acpi_status acpi_enable_subsystem(u32 flags)
 142 {
 143         acpi_status status = AE_OK;
 144
 145         ACPI_FUNCTION_TRACE(acpi_enable_subsystem);
 146
 147         /* Enable ACPI mode */
 148
 149         if (!(flags & ACPI_NO_ACPI_ENABLE)) {
 150                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 151                                   "[Init] Going into ACPI mode\n"));
 152
 153                 acpi_gbl_original_mode = acpi_hw_get_mode();
 154
 155                 status = acpi_enable();
 156                 if (ACPI_FAILURE(status)) {
 157                         ACPI_WARNING((AE_INFO, "AcpiEnable failed"));
 158                         return_ACPI_STATUS(status);
 159                 }
 160         }
 161
 162         /*
 163          * Obtain a permanent mapping for the FACS. This is required for the
 164          * Global Lock and the Firmware Waking Vector
 165          */
 166         status = acpi_tb_initialize_facs();
 167         if (ACPI_FAILURE(status)) {
 168                 ACPI_WARNING((AE_INFO, "Could not map the FACS table"));
 169                 return_ACPI_STATUS(status);
 170         }
 171
 172         /*
 173          * Install the default op_region handlers. These are installed unless
 174          * other handlers have already been installed via the
 175          * install_address_space_handler interface.
 176          */
 177         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
 178                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 179                                   "[Init] Installing default address space handlers\n"));
 180
 181                 status = acpi_ev_install_region_handlers();
 182                 if (ACPI_FAILURE(status)) {
 183                         return_ACPI_STATUS(status);
 184                 }
 185         }
 186
 187         /*
 188          * Initialize ACPI Event handling (Fixed and General Purpose)
 189          *
 190          * Note1: We must have the hardware and events initialized before we can
 191          * execute any control methods safely. Any control method can require
 192          * ACPI hardware support, so the hardware must be fully initialized before
 193          * any method execution!
 194          *
 195          * Note2: Fixed events are initialized and enabled here. GPEs are
 196          * initialized, but cannot be enabled until after the hardware is
 197          * completely initialized (SCI and global_lock activated)
 198          */
 199         if (!(flags & ACPI_NO_EVENT_INIT)) {
 200                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 201                                   "[Init] Initializing ACPI events\n"));
 202
 203                 status = acpi_ev_initialize_events();
 204                 if (ACPI_FAILURE(status)) {
 205                         return_ACPI_STATUS(status);
 206                 }
 207         }
 208
 209         /*
 210          * Install the SCI handler and Global Lock handler. This completes the
 211          * hardware initialization.
 212          */
 213         if (!(flags & ACPI_NO_HANDLER_INIT)) {
 214                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 215                                   "[Init] Installing SCI/GL handlers\n"));
 216
 217                 status = acpi_ev_install_xrupt_handlers();
 218                 if (ACPI_FAILURE(status)) {
 219                         return_ACPI_STATUS(status);
 220                 }
 221         }
 222
 223         return_ACPI_STATUS(status);
 224 }
 225
 226 ACPI_EXPORT_SYMBOL(acpi_enable_subsystem)
 227
 228 /*******************************************************************************
 229  *
 230  * FUNCTION:    acpi_initialize_objects
 231  *
 232  * PARAMETERS:  Flags           - Init/enable Options
 233  *
 234  * RETURN:      Status
 235  *
 236  * DESCRIPTION: Completes namespace initialization by initializing device
 237  *              objects and executing AML code for Regions, buffers, etc.
 238  *
 239  ******************************************************************************/
 240 acpi_status acpi_initialize_objects(u32 flags)
 241 {
 242         acpi_status status = AE_OK;
 243
 244         ACPI_FUNCTION_TRACE(acpi_initialize_objects);
 245
 246         /*
 247          * Run all _REG methods
 248          *
 249          * Note: Any objects accessed by the _REG methods will be automatically
 250          * initialized, even if they contain executable AML (see the call to
 251          * acpi_ns_initialize_objects below).
 252          */
 253         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
 254                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 255                                   "[Init] Executing _REG OpRegion methods\n"));
 256
 257                 status = acpi_ev_initialize_op_regions();
 258                 if (ACPI_FAILURE(status)) {
 259                         return_ACPI_STATUS(status);
 260                 }
 261         }
 262
 263         /*
 264          * Execute any module-level code that was detected during the table load
 265          * phase. Although illegal since ACPI 2.0, there are many machines that
 266          * contain this type of code. Each block of detected executable AML code
 267          * outside of any control method is wrapped with a temporary control
 268          * method object and placed on a global list. The methods on this list
 269          * are executed below.
 270          */
 271         acpi_ns_exec_module_code_list();
 272
 273         /*
 274          * Initialize the objects that remain uninitialized. This runs the
 275          * executable AML that may be part of the declaration of these objects:
 276          * operation_regions, buffer_fields, Buffers, and Packages.
 277          */
 278         if (!(flags & ACPI_NO_OBJECT_INIT)) {
 279                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 280                                   "[Init] Completing Initialization of ACPI Objects\n"));
 281
 282                 status = acpi_ns_initialize_objects();
 283                 if (ACPI_FAILURE(status)) {
 284                         return_ACPI_STATUS(status);
 285                 }
 286         }
 287
 288         /*
 289          * Initialize all device objects in the namespace. This runs the device
 290          * _STA and _INI methods.
 291          */
 292         if (!(flags & ACPI_NO_DEVICE_INIT)) {
 293                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 294                                   "[Init] Initializing ACPI Devices\n"));
 295
 296                 status = acpi_ns_initialize_devices();
 297                 if (ACPI_FAILURE(status)) {
 298                         return_ACPI_STATUS(status);
 299                 }
 300         }
 301
 302         /*
 303          * Empty the caches (delete the cached objects) on the assumption that
 304          * the table load filled them up more than they will be at runtime --
 305          * thus wasting non-paged memory.
 306          */
 307         status = acpi_purge_cached_objects();
 308
 309         acpi_gbl_startup_flags |= ACPI_INITIALIZED_OK;
 310         return_ACPI_STATUS(status);
 311 }
 312
 313 ACPI_EXPORT_SYMBOL(acpi_initialize_objects)
 314
 315 #endif
 316 /*******************************************************************************
 317  *
 318  * FUNCTION:    acpi_terminate
 319  *
 320  * PARAMETERS:  None
 321  *
 322  * RETURN:      Status
 323  *
 324  * DESCRIPTION: Shutdown the ACPICA subsystem and release all resources.
 325  *
 326  ******************************************************************************/
 327 acpi_status acpi_terminate(void)
 328 {
 329         acpi_status status;
 330
 331         ACPI_FUNCTION_TRACE(acpi_terminate);
 332
 333         /* Just exit if subsystem is already shutdown */
 334
 335         if (acpi_gbl_shutdown) {
 336                 ACPI_ERROR((AE_INFO, "ACPI Subsystem is already terminated"));
 337                 return_ACPI_STATUS(AE_OK);
 338         }
 339
 340         /* Subsystem appears active, go ahead and shut it down */
 341
 342         acpi_gbl_shutdown = TRUE;
 343         acpi_gbl_startup_flags = 0;
 344         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Shutting down ACPI Subsystem\n"));
 345
 346         /* Terminate the AML Debugger if present */
 347
 348         ACPI_DEBUGGER_EXEC(acpi_gbl_db_terminate_threads = TRUE);
 349
 350         /* Shutdown and free all resources */
 351
 352         acpi_ut_subsystem_shutdown();
 353
 354         /* Free the mutex objects */
 355
 356         acpi_ut_mutex_terminate();
 357
 358 #ifdef ACPI_DEBUGGER
 359
 360         /* Shut down the debugger */
 361
 362         acpi_db_terminate();
 363 #endif
 364
 365         /* Now we can shutdown the OS-dependent layer */
 366
 367         status = acpi_os_terminate();
 368         return_ACPI_STATUS(status);
 369 }
 370
 371 ACPI_EXPORT_SYMBOL(acpi_terminate)
 372
 373 #ifndef ACPI_ASL_COMPILER
 374 #ifdef ACPI_FUTURE_USAGE
 375 /*******************************************************************************
 376  *
 377  * FUNCTION:    acpi_subsystem_status
 378  *
 379  * PARAMETERS:  None
 380  *
 381  * RETURN:      Status of the ACPI subsystem
 382  *
 383  * DESCRIPTION: Other drivers that use the ACPI subsystem should call this
 384  *              before making any other calls, to ensure the subsystem
 385  *              initialized successfully.
 386  *
 387  ******************************************************************************/
 388 acpi_status acpi_subsystem_status(void)
 389 {
 390
 391         if (acpi_gbl_startup_flags & ACPI_INITIALIZED_OK) {
 392                 return (AE_OK);
 393         } else {
 394                 return (AE_ERROR);
 395         }
 396 }
 397
 398 ACPI_EXPORT_SYMBOL(acpi_subsystem_status)
 399
 400 /*******************************************************************************
 401  *
 402  * FUNCTION:    acpi_get_system_info
 403  *
 404  * PARAMETERS:  out_buffer      - A buffer to receive the resources for the
 405  *                                device
 406  *
 407  * RETURN:      Status          - the status of the call
 408  *
 409  * DESCRIPTION: This function is called to get information about the current
 410  *              state of the ACPI subsystem.  It will return system information
 411  *              in the out_buffer.
 412  *
 413  *              If the function fails an appropriate status will be returned
 414  *              and the value of out_buffer is undefined.
 415  *
 416  ******************************************************************************/
 417 acpi_status acpi_get_system_info(struct acpi_buffer * out_buffer)
 418 {
 419         struct acpi_system_info *info_ptr;
 420         acpi_status status;
 421
 422         ACPI_FUNCTION_TRACE(acpi_get_system_info);
 423
 424         /* Parameter validation */
 425
 426         status = acpi_ut_validate_buffer(out_buffer);
 427         if (ACPI_FAILURE(status)) {
 428                 return_ACPI_STATUS(status);
 429         }
 430
 431         /* Validate/Allocate/Clear caller buffer */
 432
 433         status =
 434             acpi_ut_initialize_buffer(out_buffer,
 435                                       sizeof(struct acpi_system_info));
 436         if (ACPI_FAILURE(status)) {
 437                 return_ACPI_STATUS(status);
 438         }
 439
 440         /*
 441          * Populate the return buffer
 442          */
 443         info_ptr = (struct acpi_system_info *)out_buffer->pointer;
 444
 445         info_ptr->acpi_ca_version = ACPI_CA_VERSION;
 446
 447         /* System flags (ACPI capabilities) */
 448
 449         info_ptr->flags = ACPI_SYS_MODE_ACPI;
 450
 451         /* Timer resolution - 24 or 32 bits  */
 452
 453         if (acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER) {
 454                 info_ptr->timer_resolution = 24;
 455         } else {
 456                 info_ptr->timer_resolution = 32;
 457         }
 458
 459         /* Clear the reserved fields */
 460
 461         info_ptr->reserved1 = 0;
 462         info_ptr->reserved2 = 0;
 463
 464         /* Current debug levels */
 465
 466         info_ptr->debug_layer = acpi_dbg_layer;
 467         info_ptr->debug_level = acpi_dbg_level;
 468
 469         return_ACPI_STATUS(AE_OK);
 470 }
 471
 472 ACPI_EXPORT_SYMBOL(acpi_get_system_info)
 473
 474 /*****************************************************************************
 475  *
 476  * FUNCTION:    acpi_install_initialization_handler
 477  *
 478  * PARAMETERS:  Handler             - Callback procedure
 479  *              Function            - Not (currently) used, see below
 480  *
 481  * RETURN:      Status
 482  *
 483  * DESCRIPTION: Install an initialization handler
 484  *
 485  * TBD: When a second function is added, must save the Function also.
 486  *
 487  ****************************************************************************/
 488 acpi_status
 489 acpi_install_initialization_handler(acpi_init_handler handler, u32 function)
 490 {
 491
 492         if (!handler) {
 493                 return (AE_BAD_PARAMETER);
 494         }
 495
 496         if (acpi_gbl_init_handler) {
 497                 return (AE_ALREADY_EXISTS);
 498         }
 499
 500         acpi_gbl_init_handler = handler;
 501         return AE_OK;
 502 }
 503
 504 ACPI_EXPORT_SYMBOL(acpi_install_initialization_handler)
 505 #endif                          /*  ACPI_FUTURE_USAGE  */
 506
 507 /*****************************************************************************
 508  *
 509  * FUNCTION:    acpi_purge_cached_objects
 510  *
 511  * PARAMETERS:  None
 512  *
 513  * RETURN:      Status
 514  *
 515  * DESCRIPTION: Empty all caches (delete the cached objects)
 516  *
 517  ****************************************************************************/
 518 acpi_status acpi_purge_cached_objects(void)
 519 {
 520         ACPI_FUNCTION_TRACE(acpi_purge_cached_objects);
 521
 522         (void)acpi_os_purge_cache(acpi_gbl_state_cache);
 523         (void)acpi_os_purge_cache(acpi_gbl_operand_cache);
 524         (void)acpi_os_purge_cache(acpi_gbl_ps_node_cache);
 525         (void)acpi_os_purge_cache(acpi_gbl_ps_node_ext_cache);
 526         return_ACPI_STATUS(AE_OK);
 527 }
 528
 529 ACPI_EXPORT_SYMBOL(acpi_purge_cached_objects)
 530
 531 /*****************************************************************************
 532  *
 533  * FUNCTION:    acpi_install_interface
 534  *
 535  * PARAMETERS:  interface_name      - The interface to install
 536  *
 537  * RETURN:      Status
 538  *
 539  * DESCRIPTION: Install an _OSI interface to the global list
 540  *
 541  ****************************************************************************/
 542 acpi_status acpi_install_interface(acpi_string interface_name)
 543 {
 544         acpi_status status;
 545         struct acpi_interface_info *interface_info;
 546
 547         /* Parameter validation */
 548
 549         if (!interface_name || (ACPI_STRLEN(interface_name) == 0)) {
 550                 return (AE_BAD_PARAMETER);
 551         }
 552
 553         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 554
 555         /* Check if the interface name is already in the global list */
 556
 557         interface_info = acpi_ut_get_interface(interface_name);
 558         if (interface_info) {
 559                 /*
 560                  * The interface already exists in the list. This is OK if the
 561                  * interface has been marked invalid -- just clear the bit.
 562                  */
 563                 if (interface_info->flags & ACPI_OSI_INVALID) {
 564                         interface_info->flags &= ~ACPI_OSI_INVALID;
 565                         status = AE_OK;
 566                 } else {
 567                         status = AE_ALREADY_EXISTS;
 568                 }
 569         } else {
 570                 /* New interface name, install into the global list */
 571
 572                 status = acpi_ut_install_interface(interface_name);
 573         }
 574
 575         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 576         return (status);
 577 }
 578
 579 ACPI_EXPORT_SYMBOL(acpi_install_interface)
 580
 581 /*****************************************************************************
 582  *
 583  * FUNCTION:    acpi_remove_interface
 584  *
 585  * PARAMETERS:  interface_name      - The interface to remove
 586  *
 587  * RETURN:      Status
 588  *
 589  * DESCRIPTION: Remove an _OSI interface from the global list
 590  *
 591  ****************************************************************************/
 592 acpi_status acpi_remove_interface(acpi_string interface_name)
 593 {
 594         acpi_status status;
 595
 596         /* Parameter validation */
 597
 598         if (!interface_name || (ACPI_STRLEN(interface_name) == 0)) {
 599                 return (AE_BAD_PARAMETER);
 600         }
 601
 602         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 603
 604         status = acpi_ut_remove_interface(interface_name);
 605
 606         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 607         return (status);
 608 }
 609
 610 ACPI_EXPORT_SYMBOL(acpi_remove_interface)
 611
 612 /*****************************************************************************
 613  *
 614  * FUNCTION:    acpi_install_interface_handler
 615  *
 616  * PARAMETERS:  Handler             - The _OSI interface handler to install
 617  *                                    NULL means "remove existing handler"
 618  *
 619  * RETURN:      Status
 620  *
 621  * DESCRIPTION: Install a handler for the predefined _OSI ACPI method.
 622  *              invoked during execution of the internal implementation of
 623  *              _OSI. A NULL handler simply removes any existing handler.
 624  *
 625  ****************************************************************************/
 626 acpi_status acpi_install_interface_handler(acpi_interface_handler handler)
 627 {
 628         acpi_status status = AE_OK;
 629
 630         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 631
 632         if (handler && acpi_gbl_interface_handler) {
 633                 status = AE_ALREADY_EXISTS;
 634         } else {
 635                 acpi_gbl_interface_handler = handler;
 636         }
 637
 638         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 639         return (status);
 640 }
 641
 642 ACPI_EXPORT_SYMBOL(acpi_install_interface_handler)
 643 #endif                          /* !ACPI_ASL_COMPILER */