release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/acpi/acpica/excreate.c

   1 /******************************************************************************
   2  *
   3  * Module Name: excreate - Named object creation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, 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 "acinterp.h"
  47 #include "amlcode.h"
  48 #include "acnamesp.h"
  49
  50 #define _COMPONENT          ACPI_EXECUTER
  51 ACPI_MODULE_NAME("excreate")
  52 #ifndef ACPI_NO_METHOD_EXECUTION
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_ex_create_alias
  56  *
  57  * PARAMETERS:  walk_state           - Current state, contains operands
  58  *
  59  * RETURN:      Status
  60  *
  61  * DESCRIPTION: Create a new named alias
  62  *
  63  ******************************************************************************/
  64 acpi_status acpi_ex_create_alias(struct acpi_walk_state *walk_state)
  65 {
  66         struct acpi_namespace_node *target_node;
  67         struct acpi_namespace_node *alias_node;
  68         acpi_status status = AE_OK;
  69
  70         ACPI_FUNCTION_TRACE(ex_create_alias);
  71
  72         /* Get the source/alias operands (both namespace nodes) */
  73
  74         alias_node = (struct acpi_namespace_node *)walk_state->operands[0];
  75         target_node = (struct acpi_namespace_node *)walk_state->operands[1];
  76
  77         if ((target_node->type == ACPI_TYPE_LOCAL_ALIAS) ||
  78             (target_node->type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
  79                 /*
  80                  * Dereference an existing alias so that we don't create a chain
  81                  * of aliases.  With this code, we guarantee that an alias is
  82                  * always exactly one level of indirection away from the
  83                  * actual aliased name.
  84                  */
  85                 target_node =
  86                     ACPI_CAST_PTR(struct acpi_namespace_node,
  87                                   target_node->object);
  88         }
  89
  90         /*
  91          * For objects that can never change (i.e., the NS node will
  92          * permanently point to the same object), we can simply attach
  93          * the object to the new NS node.  For other objects (such as
  94          * Integers, buffers, etc.), we have to point the Alias node
  95          * to the original Node.
  96          */
  97         switch (target_node->type) {
  98
  99                 /* For these types, the sub-object can change dynamically via a Store */
 100
 101         case ACPI_TYPE_INTEGER:
 102         case ACPI_TYPE_STRING:
 103         case ACPI_TYPE_BUFFER:
 104         case ACPI_TYPE_PACKAGE:
 105         case ACPI_TYPE_BUFFER_FIELD:
 106
 107                 /*
 108                  * These types open a new scope, so we need the NS node in order to access
 109                  * any children.
 110                  */
 111         case ACPI_TYPE_DEVICE:
 112         case ACPI_TYPE_POWER:
 113         case ACPI_TYPE_PROCESSOR:
 114         case ACPI_TYPE_THERMAL:
 115         case ACPI_TYPE_LOCAL_SCOPE:
 116
 117                 /*
 118                  * The new alias has the type ALIAS and points to the original
 119                  * NS node, not the object itself.
 120                  */
 121                 alias_node->type = ACPI_TYPE_LOCAL_ALIAS;
 122                 alias_node->object =
 123                     ACPI_CAST_PTR(union acpi_operand_object, target_node);
 124                 break;
 125
 126         case ACPI_TYPE_METHOD:
 127
 128                 /*
 129                  * Control method aliases need to be differentiated
 130                  */
 131                 alias_node->type = ACPI_TYPE_LOCAL_METHOD_ALIAS;
 132                 alias_node->object =
 133                     ACPI_CAST_PTR(union acpi_operand_object, target_node);
 134                 break;
 135
 136         default:
 137
 138                 /* Attach the original source object to the new Alias Node */
 139
 140                 /*
 141                  * The new alias assumes the type of the target, and it points
 142                  * to the same object.  The reference count of the object has an
 143                  * additional reference to prevent deletion out from under either the
 144                  * target node or the alias Node
 145                  */
 146                 status = acpi_ns_attach_object(alias_node,
 147                                                acpi_ns_get_attached_object
 148                                                (target_node),
 149                                                target_node->type);
 150                 break;
 151         }
 152
 153         /* Since both operands are Nodes, we don't need to delete them */
 154
 155         return_ACPI_STATUS(status);
 156 }
 157
 158 /*******************************************************************************
 159  *
 160  * FUNCTION:    acpi_ex_create_event
 161  *
 162  * PARAMETERS:  walk_state          - Current state
 163  *
 164  * RETURN:      Status
 165  *
 166  * DESCRIPTION: Create a new event object
 167  *
 168  ******************************************************************************/
 169
 170 acpi_status acpi_ex_create_event(struct acpi_walk_state *walk_state)
 171 {
 172         acpi_status status;
 173         union acpi_operand_object *obj_desc;
 174
 175         ACPI_FUNCTION_TRACE(ex_create_event);
 176
 177         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_EVENT);
 178         if (!obj_desc) {
 179                 status = AE_NO_MEMORY;
 180                 goto cleanup;
 181         }
 182
 183         /*
 184          * Create the actual OS semaphore, with zero initial units -- meaning
 185          * that the event is created in an unsignalled state
 186          */
 187         status = acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0,
 188                                           &obj_desc->event.os_semaphore);
 189         if (ACPI_FAILURE(status)) {
 190                 goto cleanup;
 191         }
 192
 193         /* Attach object to the Node */
 194
 195         status =
 196             acpi_ns_attach_object((struct acpi_namespace_node *)walk_state->
 197                                   operands[0], obj_desc, ACPI_TYPE_EVENT);
 198
 199       cleanup:
 200         /*
 201          * Remove local reference to the object (on error, will cause deletion
 202          * of both object and semaphore if present.)
 203          */
 204         acpi_ut_remove_reference(obj_desc);
 205         return_ACPI_STATUS(status);
 206 }
 207
 208 /*******************************************************************************
 209  *
 210  * FUNCTION:    acpi_ex_create_mutex
 211  *
 212  * PARAMETERS:  walk_state          - Current state
 213  *
 214  * RETURN:      Status
 215  *
 216  * DESCRIPTION: Create a new mutex object
 217  *
 218  *              Mutex (Name[0], sync_level[1])
 219  *
 220  ******************************************************************************/
 221
 222 acpi_status acpi_ex_create_mutex(struct acpi_walk_state *walk_state)
 223 {
 224         acpi_status status = AE_OK;
 225         union acpi_operand_object *obj_desc;
 226
 227         ACPI_FUNCTION_TRACE_PTR(ex_create_mutex, ACPI_WALK_OPERANDS);
 228
 229         /* Create the new mutex object */
 230
 231         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_MUTEX);
 232         if (!obj_desc) {
 233                 status = AE_NO_MEMORY;
 234                 goto cleanup;
 235         }
 236
 237         /* Create the actual OS Mutex */
 238
 239         status = acpi_os_create_mutex(&obj_desc->mutex.os_mutex);
 240         if (ACPI_FAILURE(status)) {
 241                 goto cleanup;
 242         }
 243
 244         /* Init object and attach to NS node */
 245
 246         obj_desc->mutex.sync_level =
 247             (u8) walk_state->operands[1]->integer.value;
 248         obj_desc->mutex.node =
 249             (struct acpi_namespace_node *)walk_state->operands[0];
 250
 251         status =
 252             acpi_ns_attach_object(obj_desc->mutex.node, obj_desc,
 253                                   ACPI_TYPE_MUTEX);
 254
 255       cleanup:
 256         /*
 257          * Remove local reference to the object (on error, will cause deletion
 258          * of both object and semaphore if present.)
 259          */
 260         acpi_ut_remove_reference(obj_desc);
 261         return_ACPI_STATUS(status);
 262 }
 263
 264 /*******************************************************************************
 265  *
 266  * FUNCTION:    acpi_ex_create_region
 267  *
 268  * PARAMETERS:  aml_start           - Pointer to the region declaration AML
 269  *              aml_length          - Max length of the declaration AML
 270  *              region_space        - space_iD for the region
 271  *              walk_state          - Current state
 272  *
 273  * RETURN:      Status
 274  *
 275  * DESCRIPTION: Create a new operation region object
 276  *
 277  ******************************************************************************/
 278
 279 acpi_status
 280 acpi_ex_create_region(u8 * aml_start,
 281                       u32 aml_length,
 282                       u8 region_space, struct acpi_walk_state *walk_state)
 283 {
 284         acpi_status status;
 285         union acpi_operand_object *obj_desc;
 286         struct acpi_namespace_node *node;
 287         union acpi_operand_object *region_obj2;
 288
 289         ACPI_FUNCTION_TRACE(ex_create_region);
 290
 291         /* Get the Namespace Node */
 292
 293         node = walk_state->op->common.node;
 294
 295         /*
 296          * If the region object is already attached to this node,
 297          * just return
 298          */
 299         if (acpi_ns_get_attached_object(node)) {
 300                 return_ACPI_STATUS(AE_OK);
 301         }
 302
 303         /*
 304          * Space ID must be one of the predefined IDs, or in the user-defined
 305          * range
 306          */
 307         if ((region_space >= ACPI_NUM_PREDEFINED_REGIONS) &&
 308             (region_space < ACPI_USER_REGION_BEGIN)) {
 309                 ACPI_ERROR((AE_INFO, "Invalid AddressSpace type 0x%X",
 310                             region_space));
 311                 return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
 312         }
 313
 314         ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Region Type - %s (0x%X)\n",
 315                           acpi_ut_get_region_name(region_space), region_space));
 316
 317         /* Create the region descriptor */
 318
 319         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION);
 320         if (!obj_desc) {
 321                 status = AE_NO_MEMORY;
 322                 goto cleanup;
 323         }
 324
 325         /*
 326          * Remember location in AML stream of address & length
 327          * operands since they need to be evaluated at run time.
 328          */
 329         region_obj2 = obj_desc->common.next_object;
 330         region_obj2->extra.aml_start = aml_start;
 331         region_obj2->extra.aml_length = aml_length;
 332
 333         /* Init the region from the operands */
 334
 335         obj_desc->region.space_id = region_space;
 336         obj_desc->region.address = 0;
 337         obj_desc->region.length = 0;
 338         obj_desc->region.node = node;
 339
 340         /* Install the new region object in the parent Node */
 341
 342         status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_REGION);
 343
 344       cleanup:
 345
 346         /* Remove local reference to the object */
 347
 348         acpi_ut_remove_reference(obj_desc);
 349         return_ACPI_STATUS(status);
 350 }
 351
 352 /*******************************************************************************
 353  *
 354  * FUNCTION:    acpi_ex_create_processor
 355  *
 356  * PARAMETERS:  walk_state          - Current state
 357  *
 358  * RETURN:      Status
 359  *
 360  * DESCRIPTION: Create a new processor object and populate the fields
 361  *
 362  *              Processor (Name[0], cpu_iD[1], pblock_addr[2], pblock_length[3])
 363  *
 364  ******************************************************************************/
 365
 366 acpi_status acpi_ex_create_processor(struct acpi_walk_state *walk_state)
 367 {
 368         union acpi_operand_object **operand = &walk_state->operands[0];
 369         union acpi_operand_object *obj_desc;
 370         acpi_status status;
 371
 372         ACPI_FUNCTION_TRACE_PTR(ex_create_processor, walk_state);
 373
 374         /* Create the processor object */
 375
 376         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PROCESSOR);
 377         if (!obj_desc) {
 378                 return_ACPI_STATUS(AE_NO_MEMORY);
 379         }
 380
 381         /* Initialize the processor object from the operands */
 382
 383         obj_desc->processor.proc_id = (u8) operand[1]->integer.value;
 384         obj_desc->processor.length = (u8) operand[3]->integer.value;
 385         obj_desc->processor.address =
 386             (acpi_io_address) operand[2]->integer.value;
 387
 388         /* Install the processor object in the parent Node */
 389
 390         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
 391                                        obj_desc, ACPI_TYPE_PROCESSOR);
 392
 393         /* Remove local reference to the object */
 394
 395         acpi_ut_remove_reference(obj_desc);
 396         return_ACPI_STATUS(status);
 397 }
 398
 399 /*******************************************************************************
 400  *
 401  * FUNCTION:    acpi_ex_create_power_resource
 402  *
 403  * PARAMETERS:  walk_state          - Current state
 404  *
 405  * RETURN:      Status
 406  *
 407  * DESCRIPTION: Create a new power_resource object and populate the fields
 408  *
 409  *              power_resource (Name[0], system_level[1], resource_order[2])
 410  *
 411  ******************************************************************************/
 412
 413 acpi_status acpi_ex_create_power_resource(struct acpi_walk_state *walk_state)
 414 {
 415         union acpi_operand_object **operand = &walk_state->operands[0];
 416         acpi_status status;
 417         union acpi_operand_object *obj_desc;
 418
 419         ACPI_FUNCTION_TRACE_PTR(ex_create_power_resource, walk_state);
 420
 421         /* Create the power resource object */
 422
 423         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_POWER);
 424         if (!obj_desc) {
 425                 return_ACPI_STATUS(AE_NO_MEMORY);
 426         }
 427
 428         /* Initialize the power object from the operands */
 429
 430         obj_desc->power_resource.system_level = (u8) operand[1]->integer.value;
 431         obj_desc->power_resource.resource_order =
 432             (u16) operand[2]->integer.value;
 433
 434         /* Install the  power resource object in the parent Node */
 435
 436         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
 437                                        obj_desc, ACPI_TYPE_POWER);
 438
 439         /* Remove local reference to the object */
 440
 441         acpi_ut_remove_reference(obj_desc);
 442         return_ACPI_STATUS(status);
 443 }
 444 #endif
 445
 446 /*******************************************************************************
 447  *
 448  * FUNCTION:    acpi_ex_create_method
 449  *
 450  * PARAMETERS:  aml_start       - First byte of the method's AML
 451  *              aml_length      - AML byte count for this method
 452  *              walk_state      - Current state
 453  *
 454  * RETURN:      Status
 455  *
 456  * DESCRIPTION: Create a new method object
 457  *
 458  ******************************************************************************/
 459
 460 acpi_status
 461 acpi_ex_create_method(u8 * aml_start,
 462                       u32 aml_length, struct acpi_walk_state *walk_state)
 463 {
 464         union acpi_operand_object **operand = &walk_state->operands[0];
 465         union acpi_operand_object *obj_desc;
 466         acpi_status status;
 467         u8 method_flags;
 468
 469         ACPI_FUNCTION_TRACE_PTR(ex_create_method, walk_state);
 470
 471         /* Create a new method object */
 472
 473         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
 474         if (!obj_desc) {
 475                 status = AE_NO_MEMORY;
 476                 goto exit;
 477         }
 478
 479         /* Save the method's AML pointer and length  */
 480
 481         obj_desc->method.aml_start = aml_start;
 482         obj_desc->method.aml_length = aml_length;
 483
 484         /*
 485          * Disassemble the method flags. Split off the Arg Count
 486          * for efficiency
 487          */
 488         method_flags = (u8) operand[1]->integer.value;
 489
 490         obj_desc->method.method_flags =
 491             (u8) (method_flags & ~AML_METHOD_ARG_COUNT);
 492         obj_desc->method.param_count =
 493             (u8) (method_flags & AML_METHOD_ARG_COUNT);
 494
 495         /*
 496          * Get the sync_level. If method is serialized, a mutex will be
 497          * created for this method when it is parsed.
 498          */
 499         if (method_flags & AML_METHOD_SERIALIZED) {
 500                 /*
 501                  * ACPI 1.0: sync_level = 0
 502                  * ACPI 2.0: sync_level = sync_level in method declaration
 503                  */
 504                 obj_desc->method.sync_level = (u8)
 505                     ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
 506         }
 507
 508         /* Attach the new object to the method Node */
 509
 510         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
 511                                        obj_desc, ACPI_TYPE_METHOD);
 512
 513         /* Remove local reference to the object */
 514
 515         acpi_ut_remove_reference(obj_desc);
 516
 517       exit:
 518         /* Remove a reference to the operand */
 519
 520         acpi_ut_remove_reference(operand[1]);
 521         return_ACPI_STATUS(status);
 522 }