drivers/acpi/acpica/excreate.c

   1 /******************************************************************************
   2  *
   3  * Module Name: excreate - Named object creation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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                  * 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                  * The new alias has the type ALIAS and points to the original
 117                  * NS node, not the object itself.
 118                  */
 119                 alias_node->type = ACPI_TYPE_LOCAL_ALIAS;
 120                 alias_node->object =
 121                     ACPI_CAST_PTR(union acpi_operand_object, target_node);
 122                 break;
 123
 124         case ACPI_TYPE_METHOD:
 125                 /*
 126                  * Control method aliases need to be differentiated
 127                  */
 128                 alias_node->type = ACPI_TYPE_LOCAL_METHOD_ALIAS;
 129                 alias_node->object =
 130                     ACPI_CAST_PTR(union acpi_operand_object, target_node);
 131                 break;
 132
 133         default:
 134
 135                 /* Attach the original source object to the new Alias Node */
 136
 137                 /*
 138                  * The new alias assumes the type of the target, and it points
 139                  * to the same object. The reference count of the object has an
 140                  * additional reference to prevent deletion out from under either the
 141                  * target node or the alias Node
 142                  */
 143                 status = acpi_ns_attach_object(alias_node,
 144                                                acpi_ns_get_attached_object
 145                                                (target_node),
 146                                                target_node->type);
 147                 break;
 148         }
 149
 150         /* Since both operands are Nodes, we don't need to delete them */
 151
 152         return_ACPI_STATUS(status);
 153 }
 154
 155 /*******************************************************************************
 156  *
 157  * FUNCTION:    acpi_ex_create_event
 158  *
 159  * PARAMETERS:  walk_state          - Current state
 160  *
 161  * RETURN:      Status
 162  *
 163  * DESCRIPTION: Create a new event object
 164  *
 165  ******************************************************************************/
 166
 167 acpi_status acpi_ex_create_event(struct acpi_walk_state *walk_state)
 168 {
 169         acpi_status status;
 170         union acpi_operand_object *obj_desc;
 171
 172         ACPI_FUNCTION_TRACE(ex_create_event);
 173
 174         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_EVENT);
 175         if (!obj_desc) {
 176                 status = AE_NO_MEMORY;
 177                 goto cleanup;
 178         }
 179
 180         /*
 181          * Create the actual OS semaphore, with zero initial units -- meaning
 182          * that the event is created in an unsignalled state
 183          */
 184         status = acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0,
 185                                           &obj_desc->event.os_semaphore);
 186         if (ACPI_FAILURE(status)) {
 187                 goto cleanup;
 188         }
 189
 190         /* Attach object to the Node */
 191
 192         status =
 193             acpi_ns_attach_object((struct acpi_namespace_node *)walk_state->
 194                                   operands[0], obj_desc, ACPI_TYPE_EVENT);
 195
 196 cleanup:
 197         /*
 198          * Remove local reference to the object (on error, will cause deletion
 199          * of both object and semaphore if present.)
 200          */
 201         acpi_ut_remove_reference(obj_desc);
 202         return_ACPI_STATUS(status);
 203 }
 204
 205 /*******************************************************************************
 206  *
 207  * FUNCTION:    acpi_ex_create_mutex
 208  *
 209  * PARAMETERS:  walk_state          - Current state
 210  *
 211  * RETURN:      Status
 212  *
 213  * DESCRIPTION: Create a new mutex object
 214  *
 215  *              Mutex (Name[0], sync_level[1])
 216  *
 217  ******************************************************************************/
 218
 219 acpi_status acpi_ex_create_mutex(struct acpi_walk_state *walk_state)
 220 {
 221         acpi_status status = AE_OK;
 222         union acpi_operand_object *obj_desc;
 223
 224         ACPI_FUNCTION_TRACE_PTR(ex_create_mutex, ACPI_WALK_OPERANDS);
 225
 226         /* Create the new mutex object */
 227
 228         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_MUTEX);
 229         if (!obj_desc) {
 230                 status = AE_NO_MEMORY;
 231                 goto cleanup;
 232         }
 233
 234         /* Create the actual OS Mutex */
 235
 236         status = acpi_os_create_mutex(&obj_desc->mutex.os_mutex);
 237         if (ACPI_FAILURE(status)) {
 238                 goto cleanup;
 239         }
 240
 241         /* Init object and attach to NS node */
 242
 243         obj_desc->mutex.sync_level = (u8)walk_state->operands[1]->integer.value;
 244         obj_desc->mutex.node =
 245             (struct acpi_namespace_node *)walk_state->operands[0];
 246
 247         status =
 248             acpi_ns_attach_object(obj_desc->mutex.node, obj_desc,
 249                                   ACPI_TYPE_MUTEX);
 250
 251 cleanup:
 252         /*
 253          * Remove local reference to the object (on error, will cause deletion
 254          * of both object and semaphore if present.)
 255          */
 256         acpi_ut_remove_reference(obj_desc);
 257         return_ACPI_STATUS(status);
 258 }
 259
 260 /*******************************************************************************
 261  *
 262  * FUNCTION:    acpi_ex_create_region
 263  *
 264  * PARAMETERS:  aml_start           - Pointer to the region declaration AML
 265  *              aml_length          - Max length of the declaration AML
 266  *              space_id            - Address space ID for the region
 267  *              walk_state          - Current state
 268  *
 269  * RETURN:      Status
 270  *
 271  * DESCRIPTION: Create a new operation region object
 272  *
 273  ******************************************************************************/
 274
 275 acpi_status
 276 acpi_ex_create_region(u8 * aml_start,
 277                       u32 aml_length,
 278                       u8 space_id, struct acpi_walk_state *walk_state)
 279 {
 280         acpi_status status;
 281         union acpi_operand_object *obj_desc;
 282         struct acpi_namespace_node *node;
 283         union acpi_operand_object *region_obj2;
 284
 285         ACPI_FUNCTION_TRACE(ex_create_region);
 286
 287         /* Get the Namespace Node */
 288
 289         node = walk_state->op->common.node;
 290
 291         /*
 292          * If the region object is already attached to this node,
 293          * just return
 294          */
 295         if (acpi_ns_get_attached_object(node)) {
 296                 return_ACPI_STATUS(AE_OK);
 297         }
 298
 299         /*
 300          * Space ID must be one of the predefined IDs, or in the user-defined
 301          * range
 302          */
 303         if (!acpi_is_valid_space_id(space_id)) {
 304                 /*
 305                  * Print an error message, but continue. We don't want to abort
 306                  * a table load for this exception. Instead, if the region is
 307                  * actually used at runtime, abort the executing method.
 308                  */
 309                 ACPI_ERROR((AE_INFO,
 310                             "Invalid/unknown Address Space ID: 0x%2.2X",
 311                             space_id));
 312         }
 313
 314         ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Region Type - %s (0x%X)\n",
 315                           acpi_ut_get_region_name(space_id), space_id));
 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         if (walk_state->scope_info) {
 333                 region_obj2->extra.scope_node =
 334                     walk_state->scope_info->scope.node;
 335         } else {
 336                 region_obj2->extra.scope_node = node;
 337         }
 338
 339         /* Init the region from the operands */
 340
 341         obj_desc->region.space_id = space_id;
 342         obj_desc->region.address = 0;
 343         obj_desc->region.length = 0;
 344         obj_desc->region.node = node;
 345
 346         /* Install the new region object in the parent Node */
 347
 348         status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_REGION);
 349
 350 cleanup:
 351
 352         /* Remove local reference to the object */
 353
 354         acpi_ut_remove_reference(obj_desc);
 355         return_ACPI_STATUS(status);
 356 }
 357
 358 /*******************************************************************************
 359  *
 360  * FUNCTION:    acpi_ex_create_processor
 361  *
 362  * PARAMETERS:  walk_state          - Current state
 363  *
 364  * RETURN:      Status
 365  *
 366  * DESCRIPTION: Create a new processor object and populate the fields
 367  *
 368  *              Processor (Name[0], cpu_ID[1], pblock_addr[2], pblock_length[3])
 369  *
 370  ******************************************************************************/
 371
 372 acpi_status acpi_ex_create_processor(struct acpi_walk_state *walk_state)
 373 {
 374         union acpi_operand_object **operand = &walk_state->operands[0];
 375         union acpi_operand_object *obj_desc;
 376         acpi_status status;
 377
 378         ACPI_FUNCTION_TRACE_PTR(ex_create_processor, walk_state);
 379
 380         /* Create the processor object */
 381
 382         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PROCESSOR);
 383         if (!obj_desc) {
 384                 return_ACPI_STATUS(AE_NO_MEMORY);
 385         }
 386
 387         /* Initialize the processor object from the operands */
 388
 389         obj_desc->processor.proc_id = (u8) operand[1]->integer.value;
 390         obj_desc->processor.length = (u8) operand[3]->integer.value;
 391         obj_desc->processor.address =
 392             (acpi_io_address) operand[2]->integer.value;
 393
 394         /* Install the processor object in the parent Node */
 395
 396         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
 397                                        obj_desc, ACPI_TYPE_PROCESSOR);
 398
 399         /* Remove local reference to the object */
 400
 401         acpi_ut_remove_reference(obj_desc);
 402         return_ACPI_STATUS(status);
 403 }
 404
 405 /*******************************************************************************
 406  *
 407  * FUNCTION:    acpi_ex_create_power_resource
 408  *
 409  * PARAMETERS:  walk_state          - Current state
 410  *
 411  * RETURN:      Status
 412  *
 413  * DESCRIPTION: Create a new power_resource object and populate the fields
 414  *
 415  *              power_resource (Name[0], system_level[1], resource_order[2])
 416  *
 417  ******************************************************************************/
 418
 419 acpi_status acpi_ex_create_power_resource(struct acpi_walk_state *walk_state)
 420 {
 421         union acpi_operand_object **operand = &walk_state->operands[0];
 422         acpi_status status;
 423         union acpi_operand_object *obj_desc;
 424
 425         ACPI_FUNCTION_TRACE_PTR(ex_create_power_resource, walk_state);
 426
 427         /* Create the power resource object */
 428
 429         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_POWER);
 430         if (!obj_desc) {
 431                 return_ACPI_STATUS(AE_NO_MEMORY);
 432         }
 433
 434         /* Initialize the power object from the operands */
 435
 436         obj_desc->power_resource.system_level = (u8) operand[1]->integer.value;
 437         obj_desc->power_resource.resource_order =
 438             (u16) operand[2]->integer.value;
 439
 440         /* Install the  power resource object in the parent Node */
 441
 442         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
 443                                        obj_desc, ACPI_TYPE_POWER);
 444
 445         /* Remove local reference to the object */
 446
 447         acpi_ut_remove_reference(obj_desc);
 448         return_ACPI_STATUS(status);
 449 }
 450 #endif
 451
 452 /*******************************************************************************
 453  *
 454  * FUNCTION:    acpi_ex_create_method
 455  *
 456  * PARAMETERS:  aml_start       - First byte of the method's AML
 457  *              aml_length      - AML byte count for this method
 458  *              walk_state      - Current state
 459  *
 460  * RETURN:      Status
 461  *
 462  * DESCRIPTION: Create a new method object
 463  *
 464  ******************************************************************************/
 465
 466 acpi_status
 467 acpi_ex_create_method(u8 * aml_start,
 468                       u32 aml_length, struct acpi_walk_state *walk_state)
 469 {
 470         union acpi_operand_object **operand = &walk_state->operands[0];
 471         union acpi_operand_object *obj_desc;
 472         acpi_status status;
 473         u8 method_flags;
 474
 475         ACPI_FUNCTION_TRACE_PTR(ex_create_method, walk_state);
 476
 477         /* Create a new method object */
 478
 479         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
 480         if (!obj_desc) {
 481                 status = AE_NO_MEMORY;
 482                 goto exit;
 483         }
 484
 485         /* Save the method's AML pointer and length  */
 486
 487         obj_desc->method.aml_start = aml_start;
 488         obj_desc->method.aml_length = aml_length;
 489
 490         /*
 491          * Disassemble the method flags. Split off the arg_count, Serialized
 492          * flag, and sync_level for efficiency.
 493          */
 494         method_flags = (u8) operand[1]->integer.value;
 495
 496         obj_desc->method.param_count =
 497             (u8) (method_flags & AML_METHOD_ARG_COUNT);
 498
 499         /*
 500          * Get the sync_level. If method is serialized, a mutex will be
 501          * created for this method when it is parsed.
 502          */
 503         if (method_flags & AML_METHOD_SERIALIZED) {
 504                 obj_desc->method.info_flags = ACPI_METHOD_SERIALIZED;
 505
 506                 /*
 507                  * ACPI 1.0: sync_level = 0
 508                  * ACPI 2.0: sync_level = sync_level in method declaration
 509                  */
 510                 obj_desc->method.sync_level = (u8)
 511                     ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
 512         }
 513
 514         /* Attach the new object to the method Node */
 515
 516         status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0],
 517                                        obj_desc, ACPI_TYPE_METHOD);
 518
 519         /* Remove local reference to the object */
 520
 521         acpi_ut_remove_reference(obj_desc);
 522
 523 exit:
 524         /* Remove a reference to the operand */
 525
 526         acpi_ut_remove_reference(operand[1]);
 527         return_ACPI_STATUS(status);
 528 }