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