Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: excreate - Named object creation |
| 4 | * |
| 5 | *****************************************************************************/ |
| 6 | |
| 7 | /* |
| 8 | * Copyright (C) 2000 - 2005, 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 | |
| 45 | #include <acpi/acpi.h> |
| 46 | #include <acpi/acinterp.h> |
| 47 | #include <acpi/amlcode.h> |
| 48 | #include <acpi/acnamesp.h> |
| 49 | #include <acpi/acevents.h> |
| 50 | #include <acpi/actables.h> |
| 51 | |
| 52 | |
| 53 | #define _COMPONENT ACPI_EXECUTER |
| 54 | ACPI_MODULE_NAME ("excreate") |
| 55 | |
| 56 | |
| 57 | #ifndef ACPI_NO_METHOD_EXECUTION |
| 58 | /***************************************************************************** |
| 59 | * |
| 60 | * FUNCTION: acpi_ex_create_alias |
| 61 | * |
| 62 | * PARAMETERS: walk_state - Current state, contains operands |
| 63 | * |
| 64 | * RETURN: Status |
| 65 | * |
| 66 | * DESCRIPTION: Create a new named alias |
| 67 | * |
| 68 | ****************************************************************************/ |
| 69 | |
| 70 | acpi_status |
| 71 | acpi_ex_create_alias ( |
| 72 | struct acpi_walk_state *walk_state) |
| 73 | { |
| 74 | struct acpi_namespace_node *target_node; |
| 75 | struct acpi_namespace_node *alias_node; |
| 76 | acpi_status status = AE_OK; |
| 77 | |
| 78 | |
| 79 | ACPI_FUNCTION_TRACE ("ex_create_alias"); |
| 80 | |
| 81 | |
| 82 | /* Get the source/alias operands (both namespace nodes) */ |
| 83 | |
| 84 | alias_node = (struct acpi_namespace_node *) walk_state->operands[0]; |
| 85 | target_node = (struct acpi_namespace_node *) walk_state->operands[1]; |
| 86 | |
| 87 | if ((target_node->type == ACPI_TYPE_LOCAL_ALIAS) || |
| 88 | (target_node->type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) { |
| 89 | /* |
| 90 | * Dereference an existing alias so that we don't create a chain |
| 91 | * of aliases. With this code, we guarantee that an alias is |
| 92 | * always exactly one level of indirection away from the |
| 93 | * actual aliased name. |
| 94 | */ |
| 95 | target_node = ACPI_CAST_PTR (struct acpi_namespace_node, target_node->object); |
| 96 | } |
| 97 | |
| 98 | /* |
| 99 | * For objects that can never change (i.e., the NS node will |
| 100 | * permanently point to the same object), we can simply attach |
| 101 | * the object to the new NS node. For other objects (such as |
| 102 | * Integers, buffers, etc.), we have to point the Alias node |
| 103 | * to the original Node. |
| 104 | */ |
| 105 | switch (target_node->type) { |
| 106 | case ACPI_TYPE_INTEGER: |
| 107 | case ACPI_TYPE_STRING: |
| 108 | case ACPI_TYPE_BUFFER: |
| 109 | case ACPI_TYPE_PACKAGE: |
| 110 | case ACPI_TYPE_BUFFER_FIELD: |
| 111 | |
| 112 | /* |
| 113 | * The new alias has the type ALIAS and points to the original |
| 114 | * NS node, not the object itself. This is because for these |
| 115 | * types, the object can change dynamically via a Store. |
| 116 | */ |
| 117 | alias_node->type = ACPI_TYPE_LOCAL_ALIAS; |
| 118 | alias_node->object = ACPI_CAST_PTR (union acpi_operand_object, target_node); |
| 119 | break; |
| 120 | |
| 121 | case ACPI_TYPE_METHOD: |
| 122 | |
| 123 | /* |
| 124 | * The new alias has the type ALIAS and points to the original |
| 125 | * NS node, not the object itself. This is because for these |
| 126 | * types, the object can change dynamically via a Store. |
| 127 | */ |
| 128 | alias_node->type = ACPI_TYPE_LOCAL_METHOD_ALIAS; |
| 129 | alias_node->object = ACPI_CAST_PTR (union acpi_operand_object, target_node); |
| 130 | break; |
| 131 | |
| 132 | default: |
| 133 | |
| 134 | /* Attach the original source object to the new Alias Node */ |
| 135 | |
| 136 | /* |
| 137 | * The new alias assumes the type of the target, and it points |
| 138 | * to the same object. The reference count of the object has an |
| 139 | * additional reference to prevent deletion out from under either the |
| 140 | * target node or the alias Node |
| 141 | */ |
| 142 | status = acpi_ns_attach_object (alias_node, |
| 143 | acpi_ns_get_attached_object (target_node), |
| 144 | target_node->type); |
| 145 | break; |
| 146 | } |
| 147 | |
| 148 | /* Since both operands are Nodes, we don't need to delete them */ |
| 149 | |
| 150 | return_ACPI_STATUS (status); |
| 151 | } |
| 152 | |
| 153 | |
| 154 | /***************************************************************************** |
| 155 | * |
| 156 | * FUNCTION: acpi_ex_create_event |
| 157 | * |
| 158 | * PARAMETERS: walk_state - Current state |
| 159 | * |
| 160 | * RETURN: Status |
| 161 | * |
| 162 | * DESCRIPTION: Create a new event object |
| 163 | * |
| 164 | ****************************************************************************/ |
| 165 | |
| 166 | acpi_status |
| 167 | acpi_ex_create_event ( |
| 168 | struct acpi_walk_state *walk_state) |
| 169 | { |
| 170 | acpi_status status; |
| 171 | union acpi_operand_object *obj_desc; |
| 172 | |
| 173 | |
| 174 | ACPI_FUNCTION_TRACE ("ex_create_event"); |
| 175 | |
| 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.semaphore); |
| 189 | if (ACPI_FAILURE (status)) { |
| 190 | goto cleanup; |
| 191 | } |
| 192 | |
| 193 | /* Attach object to the Node */ |
| 194 | |
| 195 | status = acpi_ns_attach_object ((struct acpi_namespace_node *) walk_state->operands[0], |
| 196 | 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 | * |
| 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 |
| 223 | acpi_ex_create_mutex ( |
| 224 | struct acpi_walk_state *walk_state) |
| 225 | { |
| 226 | acpi_status status = AE_OK; |
| 227 | union acpi_operand_object *obj_desc; |
| 228 | |
| 229 | |
| 230 | ACPI_FUNCTION_TRACE_PTR ("ex_create_mutex", ACPI_WALK_OPERANDS); |
| 231 | |
| 232 | |
| 233 | /* Create the new mutex object */ |
| 234 | |
| 235 | obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_MUTEX); |
| 236 | if (!obj_desc) { |
| 237 | status = AE_NO_MEMORY; |
| 238 | goto cleanup; |
| 239 | } |
| 240 | |
| 241 | /* |
| 242 | * Create the actual OS semaphore. |
| 243 | * One unit max to make it a mutex, with one initial unit to allow |
| 244 | * the mutex to be acquired. |
| 245 | */ |
| 246 | status = acpi_os_create_semaphore (1, 1, &obj_desc->mutex.semaphore); |
| 247 | if (ACPI_FAILURE (status)) { |
| 248 | goto cleanup; |
| 249 | } |
| 250 | |
| 251 | /* Init object and attach to NS node */ |
| 252 | |
| 253 | obj_desc->mutex.sync_level = (u8) walk_state->operands[1]->integer.value; |
| 254 | obj_desc->mutex.node = (struct acpi_namespace_node *) walk_state->operands[0]; |
| 255 | |
| 256 | status = acpi_ns_attach_object (obj_desc->mutex.node, |
| 257 | obj_desc, ACPI_TYPE_MUTEX); |
| 258 | |
| 259 | |
| 260 | cleanup: |
| 261 | /* |
| 262 | * Remove local reference to the object (on error, will cause deletion |
| 263 | * of both object and semaphore if present.) |
| 264 | */ |
| 265 | acpi_ut_remove_reference (obj_desc); |
| 266 | return_ACPI_STATUS (status); |
| 267 | } |
| 268 | |
| 269 | |
| 270 | /***************************************************************************** |
| 271 | * |
| 272 | * FUNCTION: acpi_ex_create_region |
| 273 | * |
| 274 | * PARAMETERS: aml_start - Pointer to the region declaration AML |
| 275 | * aml_length - Max length of the declaration AML |
| 276 | * Operands - List of operands for the opcode |
| 277 | * walk_state - Current state |
| 278 | * |
| 279 | * RETURN: Status |
| 280 | * |
| 281 | * DESCRIPTION: Create a new operation region object |
| 282 | * |
| 283 | ****************************************************************************/ |
| 284 | |
| 285 | acpi_status |
| 286 | acpi_ex_create_region ( |
| 287 | u8 *aml_start, |
| 288 | u32 aml_length, |
| 289 | u8 region_space, |
| 290 | struct acpi_walk_state *walk_state) |
| 291 | { |
| 292 | acpi_status status; |
| 293 | union acpi_operand_object *obj_desc; |
| 294 | struct acpi_namespace_node *node; |
| 295 | union acpi_operand_object *region_obj2; |
| 296 | |
| 297 | |
| 298 | ACPI_FUNCTION_TRACE ("ex_create_region"); |
| 299 | |
| 300 | |
| 301 | /* Get the Namespace Node */ |
| 302 | |
| 303 | node = walk_state->op->common.node; |
| 304 | |
| 305 | /* |
| 306 | * If the region object is already attached to this node, |
| 307 | * just return |
| 308 | */ |
| 309 | if (acpi_ns_get_attached_object (node)) { |
| 310 | return_ACPI_STATUS (AE_OK); |
| 311 | } |
| 312 | |
| 313 | /* |
| 314 | * Space ID must be one of the predefined IDs, or in the user-defined |
| 315 | * range |
| 316 | */ |
| 317 | if ((region_space >= ACPI_NUM_PREDEFINED_REGIONS) && |
| 318 | (region_space < ACPI_USER_REGION_BEGIN)) { |
| 319 | ACPI_REPORT_ERROR (("Invalid address_space type %X\n", region_space)); |
| 320 | return_ACPI_STATUS (AE_AML_INVALID_SPACE_ID); |
| 321 | } |
| 322 | |
| 323 | ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "Region Type - %s (%X)\n", |
| 324 | acpi_ut_get_region_name (region_space), region_space)); |
| 325 | |
| 326 | /* Create the region descriptor */ |
| 327 | |
| 328 | obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_REGION); |
| 329 | if (!obj_desc) { |
| 330 | status = AE_NO_MEMORY; |
| 331 | goto cleanup; |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * Remember location in AML stream of address & length |
| 336 | * operands since they need to be evaluated at run time. |
| 337 | */ |
| 338 | region_obj2 = obj_desc->common.next_object; |
| 339 | region_obj2->extra.aml_start = aml_start; |
| 340 | region_obj2->extra.aml_length = aml_length; |
| 341 | |
| 342 | /* Init the region from the operands */ |
| 343 | |
| 344 | obj_desc->region.space_id = region_space; |
| 345 | obj_desc->region.address = 0; |
| 346 | obj_desc->region.length = 0; |
| 347 | obj_desc->region.node = node; |
| 348 | |
| 349 | /* Install the new region object in the parent Node */ |
| 350 | |
| 351 | status = acpi_ns_attach_object (node, obj_desc, ACPI_TYPE_REGION); |
| 352 | |
| 353 | |
| 354 | cleanup: |
| 355 | |
| 356 | /* Remove local reference to the object */ |
| 357 | |
| 358 | acpi_ut_remove_reference (obj_desc); |
| 359 | return_ACPI_STATUS (status); |
| 360 | } |
| 361 | |
| 362 | |
| 363 | /***************************************************************************** |
| 364 | * |
| 365 | * FUNCTION: acpi_ex_create_table_region |
| 366 | * |
| 367 | * PARAMETERS: walk_state - Current state |
| 368 | * |
| 369 | * RETURN: Status |
| 370 | * |
| 371 | * DESCRIPTION: Create a new data_table_region object |
| 372 | * |
| 373 | ****************************************************************************/ |
| 374 | |
| 375 | acpi_status |
| 376 | acpi_ex_create_table_region ( |
| 377 | struct acpi_walk_state *walk_state) |
| 378 | { |
| 379 | acpi_status status; |
| 380 | union acpi_operand_object **operand = &walk_state->operands[0]; |
| 381 | union acpi_operand_object *obj_desc; |
| 382 | struct acpi_namespace_node *node; |
| 383 | struct acpi_table_header *table; |
| 384 | union acpi_operand_object *region_obj2; |
| 385 | |
| 386 | |
| 387 | ACPI_FUNCTION_TRACE ("ex_create_table_region"); |
| 388 | |
| 389 | |
| 390 | /* Get the Node from the object stack */ |
| 391 | |
| 392 | node = walk_state->op->common.node; |
| 393 | |
| 394 | /* |
| 395 | * If the region object is already attached to this node, |
| 396 | * just return |
| 397 | */ |
| 398 | if (acpi_ns_get_attached_object (node)) { |
| 399 | return_ACPI_STATUS (AE_OK); |
| 400 | } |
| 401 | |
| 402 | /* Find the ACPI table */ |
| 403 | |
| 404 | status = acpi_tb_find_table (operand[1]->string.pointer, |
| 405 | operand[2]->string.pointer, |
| 406 | operand[3]->string.pointer, &table); |
| 407 | if (ACPI_FAILURE (status)) { |
| 408 | return_ACPI_STATUS (status); |
| 409 | } |
| 410 | |
| 411 | /* Create the region descriptor */ |
| 412 | |
| 413 | obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_REGION); |
| 414 | if (!obj_desc) { |
| 415 | return_ACPI_STATUS (AE_NO_MEMORY); |
| 416 | } |
| 417 | |
| 418 | region_obj2 = obj_desc->common.next_object; |
| 419 | region_obj2->extra.region_context = NULL; |
| 420 | |
| 421 | /* Init the region from the operands */ |
| 422 | |
| 423 | obj_desc->region.space_id = REGION_DATA_TABLE; |
| 424 | obj_desc->region.address = (acpi_physical_address) ACPI_TO_INTEGER (table); |
| 425 | obj_desc->region.length = table->length; |
| 426 | obj_desc->region.node = node; |
| 427 | obj_desc->region.flags = AOPOBJ_DATA_VALID; |
| 428 | |
| 429 | /* Install the new region object in the parent Node */ |
| 430 | |
| 431 | status = acpi_ns_attach_object (node, obj_desc, ACPI_TYPE_REGION); |
| 432 | if (ACPI_FAILURE (status)) { |
| 433 | goto cleanup; |
| 434 | } |
| 435 | |
| 436 | status = acpi_ev_initialize_region (obj_desc, FALSE); |
| 437 | if (ACPI_FAILURE (status)) { |
| 438 | if (status == AE_NOT_EXIST) { |
| 439 | status = AE_OK; |
| 440 | } |
| 441 | else { |
| 442 | goto cleanup; |
| 443 | } |
| 444 | } |
| 445 | |
| 446 | obj_desc->region.flags |= AOPOBJ_SETUP_COMPLETE; |
| 447 | |
| 448 | |
| 449 | cleanup: |
| 450 | |
| 451 | /* Remove local reference to the object */ |
| 452 | |
| 453 | acpi_ut_remove_reference (obj_desc); |
| 454 | return_ACPI_STATUS (status); |
| 455 | } |
| 456 | |
| 457 | |
| 458 | /***************************************************************************** |
| 459 | * |
| 460 | * FUNCTION: acpi_ex_create_processor |
| 461 | * |
| 462 | * PARAMETERS: walk_state - Current state |
| 463 | * |
| 464 | * RETURN: Status |
| 465 | * |
| 466 | * DESCRIPTION: Create a new processor object and populate the fields |
| 467 | * |
| 468 | * Processor (Name[0], cpu_iD[1], pblock_addr[2], pblock_length[3]) |
| 469 | * |
| 470 | ****************************************************************************/ |
| 471 | |
| 472 | acpi_status |
| 473 | acpi_ex_create_processor ( |
| 474 | struct acpi_walk_state *walk_state) |
| 475 | { |
| 476 | union acpi_operand_object **operand = &walk_state->operands[0]; |
| 477 | union acpi_operand_object *obj_desc; |
| 478 | acpi_status status; |
| 479 | |
| 480 | |
| 481 | ACPI_FUNCTION_TRACE_PTR ("ex_create_processor", walk_state); |
| 482 | |
| 483 | |
| 484 | /* Create the processor object */ |
| 485 | |
| 486 | obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_PROCESSOR); |
| 487 | if (!obj_desc) { |
| 488 | return_ACPI_STATUS (AE_NO_MEMORY); |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * Initialize the processor object from the operands |
| 493 | */ |
| 494 | obj_desc->processor.proc_id = (u8) operand[1]->integer.value; |
| 495 | obj_desc->processor.address = (acpi_io_address) operand[2]->integer.value; |
| 496 | obj_desc->processor.length = (u8) operand[3]->integer.value; |
| 497 | |
| 498 | /* Install the processor object in the parent Node */ |
| 499 | |
| 500 | status = acpi_ns_attach_object ((struct acpi_namespace_node *) operand[0], |
| 501 | obj_desc, ACPI_TYPE_PROCESSOR); |
| 502 | |
| 503 | /* Remove local reference to the object */ |
| 504 | |
| 505 | acpi_ut_remove_reference (obj_desc); |
| 506 | return_ACPI_STATUS (status); |
| 507 | } |
| 508 | |
| 509 | |
| 510 | /***************************************************************************** |
| 511 | * |
| 512 | * FUNCTION: acpi_ex_create_power_resource |
| 513 | * |
| 514 | * PARAMETERS: walk_state - Current state |
| 515 | * |
| 516 | * RETURN: Status |
| 517 | * |
| 518 | * DESCRIPTION: Create a new power_resource object and populate the fields |
| 519 | * |
| 520 | * power_resource (Name[0], system_level[1], resource_order[2]) |
| 521 | * |
| 522 | ****************************************************************************/ |
| 523 | |
| 524 | acpi_status |
| 525 | acpi_ex_create_power_resource ( |
| 526 | struct acpi_walk_state *walk_state) |
| 527 | { |
| 528 | union acpi_operand_object **operand = &walk_state->operands[0]; |
| 529 | acpi_status status; |
| 530 | union acpi_operand_object *obj_desc; |
| 531 | |
| 532 | |
| 533 | ACPI_FUNCTION_TRACE_PTR ("ex_create_power_resource", walk_state); |
| 534 | |
| 535 | |
| 536 | /* Create the power resource object */ |
| 537 | |
| 538 | obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_POWER); |
| 539 | if (!obj_desc) { |
| 540 | return_ACPI_STATUS (AE_NO_MEMORY); |
| 541 | } |
| 542 | |
| 543 | /* Initialize the power object from the operands */ |
| 544 | |
| 545 | obj_desc->power_resource.system_level = (u8) operand[1]->integer.value; |
| 546 | obj_desc->power_resource.resource_order = (u16) operand[2]->integer.value; |
| 547 | |
| 548 | /* Install the power resource object in the parent Node */ |
| 549 | |
| 550 | status = acpi_ns_attach_object ((struct acpi_namespace_node *) operand[0], |
| 551 | obj_desc, ACPI_TYPE_POWER); |
| 552 | |
| 553 | /* Remove local reference to the object */ |
| 554 | |
| 555 | acpi_ut_remove_reference (obj_desc); |
| 556 | return_ACPI_STATUS (status); |
| 557 | } |
| 558 | |
| 559 | #endif |
| 560 | |
| 561 | /***************************************************************************** |
| 562 | * |
| 563 | * FUNCTION: acpi_ex_create_method |
| 564 | * |
| 565 | * PARAMETERS: aml_start - First byte of the method's AML |
| 566 | * aml_length - AML byte count for this method |
| 567 | * walk_state - Current state |
| 568 | * |
| 569 | * RETURN: Status |
| 570 | * |
| 571 | * DESCRIPTION: Create a new method object |
| 572 | * |
| 573 | ****************************************************************************/ |
| 574 | |
| 575 | acpi_status |
| 576 | acpi_ex_create_method ( |
| 577 | u8 *aml_start, |
| 578 | u32 aml_length, |
| 579 | struct acpi_walk_state *walk_state) |
| 580 | { |
| 581 | union acpi_operand_object **operand = &walk_state->operands[0]; |
| 582 | union acpi_operand_object *obj_desc; |
| 583 | acpi_status status; |
| 584 | u8 method_flags; |
| 585 | |
| 586 | |
| 587 | ACPI_FUNCTION_TRACE_PTR ("ex_create_method", walk_state); |
| 588 | |
| 589 | |
| 590 | /* Create a new method object */ |
| 591 | |
| 592 | obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_METHOD); |
| 593 | if (!obj_desc) { |
| 594 | return_ACPI_STATUS (AE_NO_MEMORY); |
| 595 | } |
| 596 | |
| 597 | /* Save the method's AML pointer and length */ |
| 598 | |
| 599 | obj_desc->method.aml_start = aml_start; |
| 600 | obj_desc->method.aml_length = aml_length; |
| 601 | |
| 602 | /* |
| 603 | * Disassemble the method flags. Split off the Arg Count |
| 604 | * for efficiency |
| 605 | */ |
| 606 | method_flags = (u8) operand[1]->integer.value; |
| 607 | |
| 608 | obj_desc->method.method_flags = (u8) (method_flags & ~AML_METHOD_ARG_COUNT); |
| 609 | obj_desc->method.param_count = (u8) (method_flags & AML_METHOD_ARG_COUNT); |
| 610 | |
| 611 | /* |
| 612 | * Get the concurrency count. If required, a semaphore will be |
| 613 | * created for this method when it is parsed. |
| 614 | */ |
| 615 | if (acpi_gbl_all_methods_serialized) { |
| 616 | obj_desc->method.concurrency = 1; |
| 617 | obj_desc->method.method_flags |= AML_METHOD_SERIALIZED; |
| 618 | } |
| 619 | else if (method_flags & AML_METHOD_SERIALIZED) { |
| 620 | /* |
| 621 | * ACPI 1.0: Concurrency = 1 |
| 622 | * ACPI 2.0: Concurrency = (sync_level (in method declaration) + 1) |
| 623 | */ |
| 624 | obj_desc->method.concurrency = (u8) |
| 625 | (((method_flags & AML_METHOD_SYNCH_LEVEL) >> 4) + 1); |
| 626 | } |
| 627 | else { |
| 628 | obj_desc->method.concurrency = ACPI_INFINITE_CONCURRENCY; |
| 629 | } |
| 630 | |
| 631 | /* Attach the new object to the method Node */ |
| 632 | |
| 633 | status = acpi_ns_attach_object ((struct acpi_namespace_node *) operand[0], |
| 634 | obj_desc, ACPI_TYPE_METHOD); |
| 635 | |
| 636 | /* Remove local reference to the object */ |
| 637 | |
| 638 | acpi_ut_remove_reference (obj_desc); |
| 639 | |
| 640 | /* Remove a reference to the operand */ |
| 641 | |
| 642 | acpi_ut_remove_reference (operand[1]); |
| 643 | return_ACPI_STATUS (status); |
| 644 | } |
| 645 | |
| 646 | |