excreate.c revision 8931d9ea78848b073bf299594f148b83abde4a5e
1/****************************************************************************** 2 * 3 * Module Name: excreate - Named object creation 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 "acinterp.h" 47#include "amlcode.h" 48#include "acnamesp.h" 49 50#define _COMPONENT ACPI_EXECUTER 51ACPI_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 ******************************************************************************/ 64acpi_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 170acpi_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 222acpi_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 279acpi_status 280acpi_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 (region_space != ACPI_ADR_SPACE_DATA_TABLE)) { 310 ACPI_ERROR((AE_INFO, "Invalid AddressSpace type 0x%X", 311 region_space)); 312 return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID); 313 } 314 315 ACPI_DEBUG_PRINT((ACPI_DB_LOAD, "Region Type - %s (0x%X)\n", 316 acpi_ut_get_region_name(region_space), region_space)); 317 318 /* Create the region descriptor */ 319 320 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_REGION); 321 if (!obj_desc) { 322 status = AE_NO_MEMORY; 323 goto cleanup; 324 } 325 326 /* 327 * Remember location in AML stream of address & length 328 * operands since they need to be evaluated at run time. 329 */ 330 region_obj2 = obj_desc->common.next_object; 331 region_obj2->extra.aml_start = aml_start; 332 region_obj2->extra.aml_length = aml_length; 333 if (walk_state->scope_info) { 334 region_obj2->extra.scope_node = 335 walk_state->scope_info->scope.node; 336 } else { 337 region_obj2->extra.scope_node = node; 338 } 339 340 /* Init the region from the operands */ 341 342 obj_desc->region.space_id = region_space; 343 obj_desc->region.address = 0; 344 obj_desc->region.length = 0; 345 obj_desc->region.node = node; 346 347 /* Install the new region object in the parent Node */ 348 349 status = acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_REGION); 350 351 cleanup: 352 353 /* Remove local reference to the object */ 354 355 acpi_ut_remove_reference(obj_desc); 356 return_ACPI_STATUS(status); 357} 358 359/******************************************************************************* 360 * 361 * FUNCTION: acpi_ex_create_processor 362 * 363 * PARAMETERS: walk_state - Current state 364 * 365 * RETURN: Status 366 * 367 * DESCRIPTION: Create a new processor object and populate the fields 368 * 369 * Processor (Name[0], cpu_iD[1], pblock_addr[2], pblock_length[3]) 370 * 371 ******************************************************************************/ 372 373acpi_status acpi_ex_create_processor(struct acpi_walk_state *walk_state) 374{ 375 union acpi_operand_object **operand = &walk_state->operands[0]; 376 union acpi_operand_object *obj_desc; 377 acpi_status status; 378 379 ACPI_FUNCTION_TRACE_PTR(ex_create_processor, walk_state); 380 381 /* Create the processor object */ 382 383 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PROCESSOR); 384 if (!obj_desc) { 385 return_ACPI_STATUS(AE_NO_MEMORY); 386 } 387 388 /* Initialize the processor object from the operands */ 389 390 obj_desc->processor.proc_id = (u8) operand[1]->integer.value; 391 obj_desc->processor.length = (u8) operand[3]->integer.value; 392 obj_desc->processor.address = 393 (acpi_io_address) operand[2]->integer.value; 394 395 /* Install the processor object in the parent Node */ 396 397 status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0], 398 obj_desc, ACPI_TYPE_PROCESSOR); 399 400 /* Remove local reference to the object */ 401 402 acpi_ut_remove_reference(obj_desc); 403 return_ACPI_STATUS(status); 404} 405 406/******************************************************************************* 407 * 408 * FUNCTION: acpi_ex_create_power_resource 409 * 410 * PARAMETERS: walk_state - Current state 411 * 412 * RETURN: Status 413 * 414 * DESCRIPTION: Create a new power_resource object and populate the fields 415 * 416 * power_resource (Name[0], system_level[1], resource_order[2]) 417 * 418 ******************************************************************************/ 419 420acpi_status acpi_ex_create_power_resource(struct acpi_walk_state *walk_state) 421{ 422 union acpi_operand_object **operand = &walk_state->operands[0]; 423 acpi_status status; 424 union acpi_operand_object *obj_desc; 425 426 ACPI_FUNCTION_TRACE_PTR(ex_create_power_resource, walk_state); 427 428 /* Create the power resource object */ 429 430 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_POWER); 431 if (!obj_desc) { 432 return_ACPI_STATUS(AE_NO_MEMORY); 433 } 434 435 /* Initialize the power object from the operands */ 436 437 obj_desc->power_resource.system_level = (u8) operand[1]->integer.value; 438 obj_desc->power_resource.resource_order = 439 (u16) operand[2]->integer.value; 440 441 /* Install the power resource object in the parent Node */ 442 443 status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0], 444 obj_desc, ACPI_TYPE_POWER); 445 446 /* Remove local reference to the object */ 447 448 acpi_ut_remove_reference(obj_desc); 449 return_ACPI_STATUS(status); 450} 451#endif 452 453/******************************************************************************* 454 * 455 * FUNCTION: acpi_ex_create_method 456 * 457 * PARAMETERS: aml_start - First byte of the method's AML 458 * aml_length - AML byte count for this method 459 * walk_state - Current state 460 * 461 * RETURN: Status 462 * 463 * DESCRIPTION: Create a new method object 464 * 465 ******************************************************************************/ 466 467acpi_status 468acpi_ex_create_method(u8 * aml_start, 469 u32 aml_length, struct acpi_walk_state *walk_state) 470{ 471 union acpi_operand_object **operand = &walk_state->operands[0]; 472 union acpi_operand_object *obj_desc; 473 acpi_status status; 474 u8 method_flags; 475 476 ACPI_FUNCTION_TRACE_PTR(ex_create_method, walk_state); 477 478 /* Create a new method object */ 479 480 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_METHOD); 481 if (!obj_desc) { 482 status = AE_NO_MEMORY; 483 goto exit; 484 } 485 486 /* Save the method's AML pointer and length */ 487 488 obj_desc->method.aml_start = aml_start; 489 obj_desc->method.aml_length = aml_length; 490 491 /* 492 * Disassemble the method flags. Split off the arg_count, Serialized 493 * flag, and sync_level for efficiency. 494 */ 495 method_flags = (u8) operand[1]->integer.value; 496 497 obj_desc->method.param_count = 498 (u8) (method_flags & AML_METHOD_ARG_COUNT); 499 500 /* 501 * Get the sync_level. If method is serialized, a mutex will be 502 * created for this method when it is parsed. 503 */ 504 if (method_flags & AML_METHOD_SERIALIZED) { 505 obj_desc->method.info_flags = ACPI_METHOD_SERIALIZED; 506 507 /* 508 * ACPI 1.0: sync_level = 0 509 * ACPI 2.0: sync_level = sync_level in method declaration 510 */ 511 obj_desc->method.sync_level = (u8) 512 ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4); 513 } 514 515 /* Attach the new object to the method Node */ 516 517 status = acpi_ns_attach_object((struct acpi_namespace_node *)operand[0], 518 obj_desc, ACPI_TYPE_METHOD); 519 520 /* Remove local reference to the object */ 521 522 acpi_ut_remove_reference(obj_desc); 523 524 exit: 525 /* Remove a reference to the operand */ 526 527 acpi_ut_remove_reference(operand[1]); 528 return_ACPI_STATUS(status); 529} 530