release/src-rt-6.x/linux/linux-2.6/drivers/acpi/executer/excreate.c

   1 /******************************************************************************
   2  *
   3  * Module Name: excreate - Named object creation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2007, R. Byron Moore
   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 <acpi/acinterp.h>
  46 #include <acpi/amlcode.h>
  47 #include <acpi/acnamesp.h>
  48 #include <acpi/acevents.h>
  49 #include <acpi/actables.h>
  50
  51 #define _COMPONENT          ACPI_EXECUTER
  52 ACPI_MODULE_NAME("excreate")
  53 #ifndef ACPI_NO_METHOD_EXECUTION
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_ex_create_alias
  57  *
  58  * PARAMETERS:  walk_state           - Current state, contains operands
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: Create a new named alias
  63  *
  64  ******************************************************************************/
  65 acpi_status acpi_ex_create_alias(struct acpi_walk_state *walk_state)
  66 {
  67         struct acpi_namespace_node *target_node;
  68         struct acpi_namespace_node *alias_node;
  69         acpi_status status = AE_OK;
  70
  71         ACPI_FUNCTION_TRACE(ex_create_alias);
  72
  73         /* Get the source/alias operands (both namespace nodes) */
  74
  75         alias_node = (struct acpi_namespace_node *)walk_state->operands[0];
  76         target_node = (struct acpi_namespace_node *)walk_state->operands[1];
  77
  78         if ((target_node->type == ACPI_TYPE_LOCAL_ALIAS) ||
  79             (target_node->type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
  80                 /*
  81                  * Dereference an existing alias so that we don't create a chain
  82                  * of aliases.  With this code, we guarantee that an alias is
  83                  * always exactly one level of indirection away from the
  84                  * actual aliased name.
  85                  */
  86                 target_node =
  87                     ACPI_CAST_PTR(struct acpi_namespace_node,
  88                                   target_node->object);
  89         }
  90
  91         /*
  92          * For objects that can never change (i.e., the NS node will
  93          * permanently point to the same object), we can simply attach
  94          * the object to the new NS node.  For other objects (such as
  95          * Integers, buffers, etc.), we have to point the Alias node
  96          * to the original Node.
  97          */
  98         switch (target_node->type) {
  99         case ACPI_TYPE_INTEGER:
 100         case ACPI_TYPE_STRING:
 101         case ACPI_TYPE_BUFFER:
 102         case ACPI_TYPE_PACKAGE:
 103         case ACPI_TYPE_BUFFER_FIELD:
 104
 105                 /*
 106                  * The new alias has the type ALIAS and points to the original
 107                  * NS node, not the object itself.  This is because for these
 108                  * types, the object can change dynamically via a Store.
 109                  */
 110                 alias_node->type = ACPI_TYPE_LOCAL_ALIAS;
 111                 alias_node->object =
 112                     ACPI_CAST_PTR(union acpi_operand_object, target_node);
 113                 break;
 114
 115         case ACPI_TYPE_METHOD:
 116
 117                 /*
 118                  * The new alias has the type ALIAS and points to the original
 119                  * NS node, not the object itself.  This is because for these
 120                  * types, the object can change dynamically via a Store.
 121                  */
 122                 alias_node->type = ACPI_TYPE_LOCAL_METHOD_ALIAS;
 123                 alias_node->object =
 124                     ACPI_CAST_PTR(union acpi_operand_object, target_node);
 125                 break;
 126
 127         default:
 128
 129                 /* Attach the original source object to the new Alias Node */
 130
 131                 /*
 132                  * The new alias assumes the type of the target, and it points
 133                  * to the same object.  The reference count of the object has an
 134                  * additional reference to prevent deletion out from under either the
 135                  * target node or the alias Node
 136                  */
 137                 status = acpi_ns_attach_object(alias_node,
 138                                                acpi_ns_get_attached_object
 139                                                (target_node),
 140                                                target_node->type);
 141                 break;
 142         }
 143
 144         /* Since both operands are Nodes, we don't need to delete them */
 145
 146         return_ACPI_STATUS(status);
 147 }
 148
 149 /*******************************************************************************
 150  *
 151  * FUNCTION:    acpi_ex_create_event
 152  *
 153  * PARAMETERS:  walk_state          - Current state
 154  *
 155  * RETURN:      Status
 156  *
 157  * DESCRIPTION: Create a new event object
 158  *
 159  ******************************************************************************/
 160
 161 acpi_status acpi_ex_create_event(struct acpi_walk_state *walk_state)
 162 {
 163         acpi_status status;
 164         union acpi_operand_object *obj_desc;
 165
 166         ACPI_FUNCTION_TRACE(ex_create_event);
 167
 168         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_EVENT);
 169         if (!obj_desc) {
 170                 status = AE_NO_MEMORY;
 171                 goto cleanup;
 172         }
 173
 174         /*
 175          * Create the actual OS semaphore, with zero initial units -- meaning
 176          * that the event is created in an unsignalled state
 177          */
 178         status = acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0,
 179                                           &obj_desc->event.os_semaphore);
 180         if (ACPI_FAILURE(status)) {
 181                 goto cleanup;
 182         }
 183
 184         /* Attach object to the Node */
 185
 186         status =
 187             acpi_ns_attach_object((struct acpi_namespace_node *)walk_state->
 188                                   operands[0], obj_desc, ACPI_TYPE_EVENT);
 189
 190       cleanup:
 191         /*
 192          * Remove local reference to the object (on error, will cause deletion
 193          * of both object and semaphore if present.)
 194          */
 195         acpi_ut_remove_reference(obj_desc);
 196         return_ACPI_STATUS(status);
 197 }
 198
 199 /*******************************************************************************
 200  *
 201  * FUNCTION:    acpi_ex_create_mutex
 202  *
 203  * PARAMETERS:  walk_state          - Current state
 204  *
 205  * RETURN:      Status
 206  *
 207  * DESCRIPTION: Create a new mutex object
 208  *
 209  *              Mutex (Name[0], sync_level[1])
 210  *
 211  ******************************************************************************/
 212
 213 acpi_status acpi_ex_create_mutex(struct acpi_walk_state *walk_state)
 214 {
 215         acpi_status status = AE_OK;
 216         union acpi_operand_object *obj_desc;
 217
 218         ACPI_FUNCTION_TRACE_PTR(ex_create_mutex, ACPI_WALK_OPERANDS);
 219
 220         /* Create the new mutex object */
 221
 222         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_MUTEX);
 223         if (!obj_desc) {
 224                 status = AE_NO_MEMORY;
 225                 goto cleanup;
 226         }
 227
 228         /* Create the actual OS Mutex */
 229
 230         status = acpi_os_create_mutex(&obj_desc->mutex.os_mutex);
 231         if (ACPI_FAILURE(status)) {
 232                 goto cleanup;
 233         }
 234
 235         /* Init object and attach to NS node */
 236
 237         obj_desc->mutex.sync_level =
 238             (u8) walk_state->operands[1]->integer.value;
 239         obj_desc->mutex.node =
 240             (struct acpi_namespace_node *)walk_state->operands[0];
 241
 242         status =
 243             acpi_ns_attach_object(obj_desc->mutex.node, obj_desc,
 244                                   ACPI_TYPE_MUTEX);
 245
 246       cleanup:
 247         /*
 248          * Remove local reference to the object (on error, will cause deletion
 249          * of both object and semaphore if present.)
 250          */
 251         acpi_ut_remove_reference(obj_desc);
 252         return_ACPI_STATUS(status);
 253 }
 254
 255 /*******************************************************************************
 256  *
 257  * FUNCTION:    acpi_ex_create_region
 258  *
 259  * PARAMETERS:  aml_start           - Pointer to the region declaration AML
 260  *              aml_length          - Max length of the declaration AML
 261  *              region_space        - space_iD for the region
 262  *              walk_state          - Current state
 263  *
 264  * RETURN:      Status
 265  *
 266  * DESCRIPTION: Create a new operation region object
 267  *
 268  ******************************************************************************/
 269
 270 acpi_status
 271 acpi_ex_create_region(u8 * aml_start,
 272                       u32 aml_length,
 273                       u8 region_space, struct acpi_walk_state *walk_state)
 274 {
 275         acpi_status status;
 276         union acpi_operand_object *obj_desc;
 277         struct acpi_namespace_node *node;
 278         union acpi_operand_object *region_obj2;
 279
 280         ACPI_FUNCTION_TRACE(ex_create_region);
 281
 282         /* Get the Namespace Node */
 283
 284         node = walk_state->op->common.node;
 285
 286         /*
 287          * If the region object is already attached to this node,
 288          * just return
 289          */
 290         if (acpi_ns_get_attached_object(node)) {
 291                 return_ACPI_STATUS(AE_OK);
 292         }
 293
 294         /*
 295          * Space ID must be one of the predefined IDs, or in the user-defined
 296          * range
 297          */
 298         if ((region_space >= ACPI_NUM_PREDEFINED_REGIONS) &&
 299             (region_space < ACPI_USER_REGION_BEGIN)) {
 300                 ACPI_ERROR((AE_INFO, "Invalid AddressSpace type %X",
 301                             region_space));
 302                 return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
 303         }
 304
 305         ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Region Type - %s (%X)\n",
 306                           acpi_ut_get_region_name(region_space), region_space));
 307
 308         /* Create the region descriptor */
 309
 310         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION);
 311         if (!obj_desc) {
 312                 status = AE_NO_MEMORY;
 313                 goto cleanup;
 314         }
 315
 316         /*
 317          * Remember location in AML stream of address & length
 318          * operands since they need to be evaluated at run time.
 319          */
 320         region_obj2 = obj_desc->common.next_object;
 321         region_obj2->extra.aml_start = aml_start;
 322         region_obj2->extra.aml_length = aml_length;
 323
 324         /* Init the region from the operands */
 325
 326         obj_desc->region.space_id = region_space;
 327         obj_desc->region.address = 0;
 328         obj_desc->region.length = 0;
 329         obj_desc->region.node = node;
 330
 331         /* Install the new region object in the parent Node */
 332
 333         status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_REGION);
 334
 335       cleanup:
 336
 337         /* Remove local reference to the object */
 338
 339         acpi_ut_remove_reference(obj_desc);
 340         return_ACPI_STATUS(status);
 341 }
 342
 343 /*******************************************************************************
 344  *
 345  * FUNCTION:    acpi_ex_create_table_region
 346  *
 347  * PARAMETERS:  walk_state          - Current state
 348  *
 349  * RETURN:      Status
 350  *
 351  * DESCRIPTION: Create a new data_table_region object
 352  *
 353  ******************************************************************************/
 354
 355 acpi_status acpi_ex_create_table_region(struct acpi_walk_state *walk_state)
 356 {
 357         acpi_status status;
 358         union acpi_operand_object **operand = &walk_state->operands[0];
 359         union acpi_operand_object *obj_desc;
 360         struct acpi_namespace_node *node;
 361         union acpi_operand_object *region_obj2;
 362         acpi_native_uint table_index;
 363         struct acpi_table_header *table;
 364
 365         ACPI_FUNCTION_TRACE(ex_create_table_region);
 366
 367         /* Get the Node from the object stack  */
 368
 369         node = walk_state->op->common.node;
 370
 371         /*
 372          * If the region object is already attached to this node,
 373          * just return
 374          */
 375         if (acpi_ns_get_attached_object(node)) {
 376                 return_ACPI_STATUS(AE_OK);
 377         }
 378
 379         /* Find the ACPI table */
 380
 381         status = acpi_tb_find_table(operand[1]->string.pointer,
 382                                     operand[2]->string.pointer,
 383                                     operand[3]->string.pointer, &table_index);
 384         if (ACPI_FAILURE(status)) {
 385                 return_ACPI_STATUS(status);
 386         }
 387
 388         /* Create the region descriptor */
 389
 390         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION);
 391         if (!obj_desc) {
 392                 return_ACPI_STATUS(AE_NO_MEMORY);
 393         }
 394
 395         region_obj2 = obj_desc->common.next_object;
 396         region_obj2->extra.region_context = NULL;
 397
 398         status = acpi_get_table_by_index(table_index, &table);
 399         if (ACPI_FAILURE(status)) {
 400                 return_ACPI_STATUS(status);
 401         }
 402
 403         /* Init the region from the operands */
 404
 405         obj_desc->region.space_id = REGION_DATA_TABLE;
 406         obj_desc->region.address =
 407             (acpi_physical_address) ACPI_TO_INTEGER(table);
 408         obj_desc->region.length = table->length;
 409         obj_desc->region.node = node;
 410         obj_desc->region.flags = AOPOBJ_DATA_VALID;
 411
 412         /* Install the new region object in the parent Node */
 413
 414         status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_REGION);
 415         if (ACPI_FAILURE(status)) {
 416                 goto cleanup;
 417         }
 418
 419         status = acpi_ev_initialize_region(obj_desc, FALSE);
 420         if (ACPI_FAILURE(status)) {
 421                 if (status == AE_NOT_EXIST) {
 422                         status = AE_OK;
 423                 } else {
 424                         goto cleanup;
 425                 }
 426         }
 427
 428         obj_desc->region.flags |= AOPOBJ_SETUP_COMPLETE;
 429
 430       cleanup:
 431
 432         /* Remove local reference to the object */
 433
 434         acpi_ut_remove_reference(obj_desc);
 435         return_ACPI_STATUS(status);
 436 }
 437
 438 /*******************************************************************************
 439  *
 440  * FUNCTION:    acpi_ex_create_processor
 441  *
 442  * PARAMETERS:  walk_state          - Current state
 443  *
 444  * RETURN:      Status
 445  *
 446  * DESCRIPTION: Create a new processor object and populate the fields
 447  *
 448  *              Processor (Name[0], cpu_iD[1], pblock_addr[2], pblock_length[3])
 449  *
 450  ******************************************************************************/
 451
 452 acpi_status acpi_ex_create_processor(struct acpi_walk_state *walk_state)
 453 {
 454         union acpi_operand_object **operand = &walk_state->operands[0];
 455         union acpi_operand_object *obj_desc;
 456         acpi_status status;
 457
 458         ACPI_FUNCTION_TRACE_PTR(ex_create_processor, walk_state);
 459
 460         /* Create the processor object */
 461
 462         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PROCESSOR);
 463         if (!obj_desc) {
 464                 return_ACPI_STATUS(AE_NO_MEMORY);
 465         }
 466
 467         /* Initialize the processor object from the operands */
 468
 469         obj_desc->processor.proc_id = (u8) operand[1]->integer.value;
 470         obj_desc->processor.length = (u8) operand[3]->integer.value;
 471         obj_desc->processor.address =
 472             (acpi_io_address) operand[2]->integer.value;
 473
 474         /* Install the processor object in the parent Node */
 475
 476         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
 477                                        obj_desc, ACPI_TYPE_PROCESSOR);
 478
 479         /* Remove local reference to the object */
 480
 481         acpi_ut_remove_reference(obj_desc);
 482         return_ACPI_STATUS(status);
 483 }
 484
 485 /*******************************************************************************
 486  *
 487  * FUNCTION:    acpi_ex_create_power_resource
 488  *
 489  * PARAMETERS:  walk_state          - Current state
 490  *
 491  * RETURN:      Status
 492  *
 493  * DESCRIPTION: Create a new power_resource object and populate the fields
 494  *
 495  *              power_resource (Name[0], system_level[1], resource_order[2])
 496  *
 497  ******************************************************************************/
 498
 499 acpi_status acpi_ex_create_power_resource(struct acpi_walk_state *walk_state)
 500 {
 501         union acpi_operand_object **operand = &walk_state->operands[0];
 502         acpi_status status;
 503         union acpi_operand_object *obj_desc;
 504
 505         ACPI_FUNCTION_TRACE_PTR(ex_create_power_resource, walk_state);
 506
 507         /* Create the power resource object */
 508
 509         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_POWER);
 510         if (!obj_desc) {
 511                 return_ACPI_STATUS(AE_NO_MEMORY);
 512         }
 513
 514         /* Initialize the power object from the operands */
 515
 516         obj_desc->power_resource.system_level = (u8) operand[1]->integer.value;
 517         obj_desc->power_resource.resource_order =
 518             (u16) operand[2]->integer.value;
 519
 520         /* Install the  power resource object in the parent Node */
 521
 522         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
 523                                        obj_desc, ACPI_TYPE_POWER);
 524
 525         /* Remove local reference to the object */
 526
 527         acpi_ut_remove_reference(obj_desc);
 528         return_ACPI_STATUS(status);
 529 }
 530 #endif
 531
 532 /*******************************************************************************
 533  *
 534  * FUNCTION:    acpi_ex_create_method
 535  *
 536  * PARAMETERS:  aml_start       - First byte of the method's AML
 537  *              aml_length      - AML byte count for this method
 538  *              walk_state      - Current state
 539  *
 540  * RETURN:      Status
 541  *
 542  * DESCRIPTION: Create a new method object
 543  *
 544  ******************************************************************************/
 545
 546 acpi_status
 547 acpi_ex_create_method(u8 * aml_start,
 548                       u32 aml_length, struct acpi_walk_state *walk_state)
 549 {
 550         union acpi_operand_object **operand = &walk_state->operands[0];
 551         union acpi_operand_object *obj_desc;
 552         acpi_status status;
 553         u8 method_flags;
 554
 555         ACPI_FUNCTION_TRACE_PTR(ex_create_method, walk_state);
 556
 557         /* Create a new method object */
 558
 559         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
 560         if (!obj_desc) {
 561                 status = AE_NO_MEMORY;
 562                 goto exit;
 563         }
 564
 565         /* Save the method's AML pointer and length  */
 566
 567         obj_desc->method.aml_start = aml_start;
 568         obj_desc->method.aml_length = aml_length;
 569
 570         /*
 571          * Disassemble the method flags. Split off the Arg Count
 572          * for efficiency
 573          */
 574         method_flags = (u8) operand[1]->integer.value;
 575
 576         obj_desc->method.method_flags =
 577             (u8) (method_flags & ~AML_METHOD_ARG_COUNT);
 578         obj_desc->method.param_count =
 579             (u8) (method_flags & AML_METHOD_ARG_COUNT);
 580
 581         /*
 582          * Get the sync_level. If method is serialized, a mutex will be
 583          * created for this method when it is parsed.
 584          */
 585         if (method_flags & AML_METHOD_SERIALIZED) {
 586                 /*
 587                  * ACPI 1.0: sync_level = 0
 588                  * ACPI 2.0: sync_level = sync_level in method declaration
 589                  */
 590                 obj_desc->method.sync_level = (u8)
 591                     ((method_flags & AML_METHOD_SYNCH_LEVEL) >> 4);
 592         }
 593
 594         /* Attach the new object to the method Node */
 595
 596         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
 597                                        obj_desc, ACPI_TYPE_METHOD);
 598
 599         /* Remove local reference to the object */
 600
 601         acpi_ut_remove_reference(obj_desc);
 602
 603       exit:
 604         /* Remove a reference to the operand */
 605
 606         acpi_ut_remove_reference(operand[1]);
 607         return_ACPI_STATUS(status);
 608 }