git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/executer/excreate.c

   1 /******************************************************************************
   2  *
   3  * Module Name: excreate - Named object creation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, 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 <acpi/acinterp.h>
  46 #include <acpi/amlcode.h>
  47 #include <acpi/acnamesp.h>
  48
  49 #define _COMPONENT          ACPI_EXECUTER
  50 ACPI_MODULE_NAME("excreate")
  51 #ifndef ACPI_NO_METHOD_EXECUTION
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_ex_create_alias
  55  *
  56  * PARAMETERS:  walk_state           - Current state, contains operands
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: Create a new named alias
  61  *
  62  ******************************************************************************/
  63 acpi_status acpi_ex_create_alias(struct acpi_walk_state *walk_state)
  64 {
  65         struct acpi_namespace_node *target_node;
  66         struct acpi_namespace_node *alias_node;
  67         acpi_status status = AE_OK;
  68
  69         ACPI_FUNCTION_TRACE(ex_create_alias);
  70
  71         /* Get the source/alias operands (both namespace nodes) */
  72
  73         alias_node = (struct acpi_namespace_node *)walk_state->operands[0];
  74         target_node = (struct acpi_namespace_node *)walk_state->operands[1];
  75
  76         if ((target_node->type == ACPI_TYPE_LOCAL_ALIAS) ||
  77             (target_node->type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
  78                 /*
  79                  * Dereference an existing alias so that we don't create a chain
  80                  * of aliases.  With this code, we guarantee that an alias is
  81                  * always exactly one level of indirection away from the
  82                  * actual aliased name.
  83                  */
  84                 target_node =
  85                     ACPI_CAST_PTR(struct acpi_namespace_node,
  86                                   target_node->object);
  87         }
  88
  89         /*
  90          * For objects that can never change (i.e., the NS node will
  91          * permanently point to the same object), we can simply attach
  92          * the object to the new NS node.  For other objects (such as
  93          * Integers, buffers, etc.), we have to point the Alias node
  94          * to the original Node.
  95          */
  96         switch (target_node->type) {
  97
  98                 /* For these types, the sub-object can change dynamically via a Store */
  99
 100         case ACPI_TYPE_INTEGER:
 101         case ACPI_TYPE_STRING:
 102         case ACPI_TYPE_BUFFER:
 103         case ACPI_TYPE_PACKAGE:
 104         case ACPI_TYPE_BUFFER_FIELD:
 105
 106                 /*
 107                  * These types open a new scope, so we need the NS node in order to access
 108                  * any children.
 109                  */
 110         case ACPI_TYPE_DEVICE:
 111         case ACPI_TYPE_POWER:
 112         case ACPI_TYPE_PROCESSOR:
 113         case ACPI_TYPE_THERMAL:
 114         case ACPI_TYPE_LOCAL_SCOPE:
 115
 116                 /*
 117                  * The new alias has the type ALIAS and points to the original
 118                  * NS node, not the object itself.
 119                  */
 120                 alias_node->type = ACPI_TYPE_LOCAL_ALIAS;
 121                 alias_node->object =
 122                     ACPI_CAST_PTR(union acpi_operand_object, target_node);
 123                 break;
 124
 125         case ACPI_TYPE_METHOD:
 126
 127                 /*
 128                  * Control method aliases need to be differentiated
 129                  */
 130                 alias_node->type = ACPI_TYPE_LOCAL_METHOD_ALIAS;
 131                 alias_node->object =
 132                     ACPI_CAST_PTR(union acpi_operand_object, target_node);
 133                 break;
 134
 135         default:
 136
 137                 /* Attach the original source object to the new Alias Node */
 138
 139                 /*
 140                  * The new alias assumes the type of the target, and it points
 141                  * to the same object.  The reference count of the object has an
 142                  * additional reference to prevent deletion out from under either the
 143                  * target node or the alias Node
 144                  */
 145                 status = acpi_ns_attach_object(alias_node,
 146                                                acpi_ns_get_attached_object
 147                                                (target_node),
 148                                                target_node->type);
 149                 break;
 150         }
 151
 152         /* Since both operands are Nodes, we don't need to delete them */
 153
 154         return_ACPI_STATUS(status);
 155 }
 156
 157 /*******************************************************************************
 158  *
 159  * FUNCTION:    acpi_ex_create_event
 160  *
 161  * PARAMETERS:  walk_state          - Current state
 162  *
 163  * RETURN:      Status
 164  *
 165  * DESCRIPTION: Create a new event object
 166  *
 167  ******************************************************************************/
 168
 169 acpi_status acpi_ex_create_event(struct acpi_walk_state *walk_state)
 170 {
 171         acpi_status status;
 172         union acpi_operand_object *obj_desc;
 173
 174         ACPI_FUNCTION_TRACE(ex_create_event);
 175
 176         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_EVENT);
 177         if (!obj_desc) {
 178                 status = AE_NO_MEMORY;
 179                 goto cleanup;
 180         }
 181
 182         /*
 183          * Create the actual OS semaphore, with zero initial units -- meaning
 184          * that the event is created in an unsignalled state
 185          */
 186         status = acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0,
 187                                           &obj_desc->event.os_semaphore);
 188         if (ACPI_FAILURE(status)) {
 189                 goto cleanup;
 190         }
 191
 192         /* Attach object to the Node */
 193
 194         status =
 195             acpi_ns_attach_object((struct acpi_namespace_node *)walk_state->
 196                                   operands[0], obj_desc, ACPI_TYPE_EVENT);
 197
 198       cleanup:
 199         /*
 200          * Remove local reference to the object (on error, will cause deletion
 201          * of both object and semaphore if present.)
 202          */
 203         acpi_ut_remove_reference(obj_desc);
 204         return_ACPI_STATUS(status);
 205 }
 206
 207 /*******************************************************************************
 208  *
 209  * FUNCTION:    acpi_ex_create_mutex
 210  *
 211  * PARAMETERS:  walk_state          - Current state
 212  *
 213  * RETURN:      Status
 214  *
 215  * DESCRIPTION: Create a new mutex object
 216  *
 217  *              Mutex (Name[0], sync_level[1])
 218  *
 219  ******************************************************************************/
 220
 221 acpi_status acpi_ex_create_mutex(struct acpi_walk_state *walk_state)
 222 {
 223         acpi_status status = AE_OK;
 224         union acpi_operand_object *obj_desc;
 225
 226         ACPI_FUNCTION_TRACE_PTR(ex_create_mutex, ACPI_WALK_OPERANDS);
 227
 228         /* Create the new mutex object */
 229
 230         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_MUTEX);
 231         if (!obj_desc) {
 232                 status = AE_NO_MEMORY;
 233                 goto cleanup;
 234         }
 235
 236         /* Create the actual OS Mutex */
 237
 238         status = acpi_os_create_mutex(&obj_desc->mutex.os_mutex);
 239         if (ACPI_FAILURE(status)) {
 240                 goto cleanup;
 241         }
 242
 243         /* Init object and attach to NS node */
 244
 245         obj_desc->mutex.sync_level =
 246             (u8) walk_state->operands[1]->integer.value;
 247         obj_desc->mutex.node =
 248             (struct acpi_namespace_node *)walk_state->operands[0];
 249
 250         status =
 251             acpi_ns_attach_object(obj_desc->mutex.node, obj_desc,
 252                                   ACPI_TYPE_MUTEX);
 253
 254       cleanup:
 255         /*
 256          * Remove local reference to the object (on error, will cause deletion
 257          * of both object and semaphore if present.)
 258          */
 259         acpi_ut_remove_reference(obj_desc);
 260         return_ACPI_STATUS(status);
 261 }
 262
 263 /*******************************************************************************
 264  *
 265  * FUNCTION:    acpi_ex_create_region
 266  *
 267  * PARAMETERS:  aml_start           - Pointer to the region declaration AML
 268  *              aml_length          - Max length of the declaration AML
 269  *              region_space        - space_iD for the region
 270  *              walk_state          - Current state
 271  *
 272  * RETURN:      Status
 273  *
 274  * DESCRIPTION: Create a new operation region object
 275  *
 276  ******************************************************************************/
 277
 278 acpi_status
 279 acpi_ex_create_region(u8 * aml_start,
 280                       u32 aml_length,
 281                       u8 region_space, struct acpi_walk_state *walk_state)
 282 {
 283         acpi_status status;
 284         union acpi_operand_object *obj_desc;
 285         struct acpi_namespace_node *node;
 286         union acpi_operand_object *region_obj2;
 287
 288         ACPI_FUNCTION_TRACE(ex_create_region);
 289
 290         /* Get the Namespace Node */
 291
 292         node = walk_state->op->common.node;
 293
 294         /*
 295          * If the region object is already attached to this node,
 296          * just return
 297          */
 298         if (acpi_ns_get_attached_object(node)) {
 299                 return_ACPI_STATUS(AE_OK);
 300         }
 301
 302         /*
 303          * Space ID must be one of the predefined IDs, or in the user-defined
 304          * range
 305          */
 306         if ((region_space >= ACPI_NUM_PREDEFINED_REGIONS) &&
 307             (region_space < ACPI_USER_REGION_BEGIN)) {
 308                 ACPI_ERROR((AE_INFO, "Invalid AddressSpace type %X",
 309                             region_space));
 310                 return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
 311         }
 312
 313         ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Region Type - %s (%X)\n",
 314                           acpi_ut_get_region_name(region_space), region_space));
 315
 316         /* Create the region descriptor */
 317
 318         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION);
 319         if (!obj_desc) {
 320                 status = AE_NO_MEMORY;
 321                 goto cleanup;
 322         }
 323
 324         /*
 325          * Remember location in AML stream of address & length
 326          * operands since they need to be evaluated at run time.
 327          */
 328         region_obj2 = obj_desc->common.next_object;
 329         region_obj2->extra.aml_start = aml_start;
 330         region_obj2->extra.aml_length = aml_length;
 331
 332         /* Init the region from the operands */
 333
 334         obj_desc->region.space_id = region_space;
 335         obj_desc->region.address = 0;
 336         obj_desc->region.length = 0;
 337         obj_desc->region.node = node;
 338
 339         /* Install the new region object in the parent Node */
 340
 341         status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_REGION);
 342
 343       cleanup:
 344
 345         /* Remove local reference to the object */
 346
 347         acpi_ut_remove_reference(obj_desc);
 348         return_ACPI_STATUS(status);
 349 }
 350
 351 /*******************************************************************************
 352  *
 353  * FUNCTION:    acpi_ex_create_processor
 354  *
 355  * PARAMETERS:  walk_state          - Current state
 356  *
 357  * RETURN:      Status
 358  *
 359  * DESCRIPTION: Create a new processor object and populate the fields
 360  *
 361  *              Processor (Name[0], cpu_iD[1], pblock_addr[2], pblock_length[3])
 362  *
 363  ******************************************************************************/
 364
 365 acpi_status acpi_ex_create_processor(struct acpi_walk_state *walk_state)
 366 {
 367         union acpi_operand_object **operand = &walk_state->operands[0];
 368         union acpi_operand_object *obj_desc;
 369         acpi_status status;
 370
 371         ACPI_FUNCTION_TRACE_PTR(ex_create_processor, walk_state);
 372
 373         /* Create the processor object */
 374
 375         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PROCESSOR);
 376         if (!obj_desc) {
 377                 return_ACPI_STATUS(AE_NO_MEMORY);
 378         }
 379
 380         /* Initialize the processor object from the operands */
 381
 382         obj_desc->processor.proc_id = (u8) operand[1]->integer.value;
 383         obj_desc->processor.length = (u8) operand[3]->integer.value;
 384         obj_desc->processor.address =
 385             (acpi_io_address) operand[2]->integer.value;
 386
 387         /* Install the processor object in the parent Node */
 388
 389         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
 390                                        obj_desc, ACPI_TYPE_PROCESSOR);
 391
 392         /* Remove local reference to the object */
 393
 394         acpi_ut_remove_reference(obj_desc);
 395         return_ACPI_STATUS(status);
 396 }
 397
 398 /*******************************************************************************
 399  *
 400  * FUNCTION:    acpi_ex_create_power_resource
 401  *
 402  * PARAMETERS:  walk_state          - Current state
 403  *
 404  * RETURN:      Status
 405  *
 406  * DESCRIPTION: Create a new power_resource object and populate the fields
 407  *
 408  *              power_resource (Name[0], system_level[1], resource_order[2])
 409  *
 410  ******************************************************************************/
 411
 412 acpi_status acpi_ex_create_power_resource(struct acpi_walk_state *walk_state)
 413 {
 414         union acpi_operand_object **operand = &walk_state->operands[0];
 415         acpi_status status;
 416         union acpi_operand_object *obj_desc;
 417
 418         ACPI_FUNCTION_TRACE_PTR(ex_create_power_resource, walk_state);
 419
 420         /* Create the power resource object */
 421
 422         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_POWER);
 423         if (!obj_desc) {
 424                 return_ACPI_STATUS(AE_NO_MEMORY);
 425         }
 426
 427         /* Initialize the power object from the operands */
 428
 429         obj_desc->power_resource.system_level = (u8) operand[1]->integer.value;
 430         obj_desc->power_resource.resource_order =
 431             (u16) operand[2]->integer.value;
 432
 433         /* Install the  power resource object in the parent Node */
 434
 435         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
 436                                        obj_desc, ACPI_TYPE_POWER);
 437
 438         /* Remove local reference to the object */
 439
 440         acpi_ut_remove_reference(obj_desc);
 441         return_ACPI_STATUS(status);
 442 }
 443 #endif
 444
 445 /*******************************************************************************
 446  *
 447  * FUNCTION:    acpi_ex_create_method
 448  *
 449  * PARAMETERS:  aml_start       - First byte of the method's AML
 450  *              aml_length      - AML byte count for this method
 451  *              walk_state      - Current state
 452  *
 453  * RETURN:      Status
 454  *
 455  * DESCRIPTION: Create a new method object
 456  *
 457  ******************************************************************************/
 458
 459 acpi_status
 460 acpi_ex_create_method(u8 * aml_start,
 461                       u32 aml_length, struct acpi_walk_state *walk_state)
 462 {
 463         union acpi_operand_object **operand = &walk_state->operands[0];
 464         union acpi_operand_object *obj_desc;
 465         acpi_status status;
 466         u8 method_flags;
 467
 468         ACPI_FUNCTION_TRACE_PTR(ex_create_method, walk_state);
 469
 470         /* Create a new method object */
 471
 472         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
 473         if (!obj_desc) {
 474                 status = AE_NO_MEMORY;
 475                 goto exit;
 476         }
 477
 478         /* Save the method's AML pointer and length  */
 479
 480         obj_desc->method.aml_start = aml_start;
 481         obj_desc->method.aml_length = aml_length;
 482
 483         /*
 484          * Disassemble the method flags. Split off the Arg Count
 485          * for efficiency
 486          */
 487         method_flags = (u8) operand[1]->integer.value;
 488
 489         obj_desc->method.method_flags =
 490             (u8) (method_flags & ~AML_METHOD_ARG_COUNT);
 491         obj_desc->method.param_count =
 492             (u8) (method_flags & AML_METHOD_ARG_COUNT);
 493
 494         /*
 495          * Get the sync_level. If method is serialized, a mutex will be
 496          * created for this method when it is parsed.
 497          */
 498         if (method_flags & AML_METHOD_SERIALIZED) {
 499                 /*
 500                  * ACPI 1.0: sync_level = 0
 501                  * ACPI 2.0: sync_level = sync_level in method declaration
 502                  */
 503                 obj_desc->method.sync_level = (u8)
 504                     ((method_flags & AML_METHOD_SYNCH_LEVEL) >> 4);
 505         }
 506
 507         /* Attach the new object to the method Node */
 508
 509         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
 510                                        obj_desc, ACPI_TYPE_METHOD);
 511
 512         /* Remove local reference to the object */
 513
 514         acpi_ut_remove_reference(obj_desc);
 515
 516       exit:
 517         /* Remove a reference to the operand */
 518
 519         acpi_ut_remove_reference(operand[1]);
 520         return_ACPI_STATUS(status);
 521 }