1 /****************************************************************************** 2 * 3 * Module Name: exresolv - AML Interpreter object resolution 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2014, 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 "amlcode.h" 47 #include "acdispat.h" 48 #include "acinterp.h" 49 #include "acnamesp.h" 50 51 #define _COMPONENT ACPI_EXECUTER 52 ACPI_MODULE_NAME("exresolv") 53 54 /* Local prototypes */ 55 static acpi_status 56 acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr, 57 struct acpi_walk_state *walk_state); 58 59 /******************************************************************************* 60 * 61 * FUNCTION: acpi_ex_resolve_to_value 62 * 63 * PARAMETERS: **stack_ptr - Points to entry on obj_stack, which can 64 * be either an (union acpi_operand_object *) 65 * or an acpi_handle. 66 * walk_state - Current method state 67 * 68 * RETURN: Status 69 * 70 * DESCRIPTION: Convert Reference objects to values 71 * 72 ******************************************************************************/ 73 74 acpi_status 75 acpi_ex_resolve_to_value(union acpi_operand_object **stack_ptr, 76 struct acpi_walk_state *walk_state) 77 { 78 acpi_status status; 79 80 ACPI_FUNCTION_TRACE_PTR(ex_resolve_to_value, stack_ptr); 81 82 if (!stack_ptr || !*stack_ptr) { 83 ACPI_ERROR((AE_INFO, "Internal - null pointer")); 84 return_ACPI_STATUS(AE_AML_NO_OPERAND); 85 } 86 87 /* 88 * The entity pointed to by the stack_ptr can be either 89 * 1) A valid union acpi_operand_object, or 90 * 2) A struct acpi_namespace_node (named_obj) 91 */ 92 if (ACPI_GET_DESCRIPTOR_TYPE(*stack_ptr) == ACPI_DESC_TYPE_OPERAND) { 93 status = acpi_ex_resolve_object_to_value(stack_ptr, walk_state); 94 if (ACPI_FAILURE(status)) { 95 return_ACPI_STATUS(status); 96 } 97 98 if (!*stack_ptr) { 99 ACPI_ERROR((AE_INFO, "Internal - null pointer")); 100 return_ACPI_STATUS(AE_AML_NO_OPERAND); 101 } 102 } 103 104 /* 105 * Object on the stack may have changed if acpi_ex_resolve_object_to_value() 106 * was called (i.e., we can't use an _else_ here.) 107 */ 108 if (ACPI_GET_DESCRIPTOR_TYPE(*stack_ptr) == ACPI_DESC_TYPE_NAMED) { 109 status = 110 acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR 111 (struct acpi_namespace_node, 112 stack_ptr), walk_state); 113 if (ACPI_FAILURE(status)) { 114 return_ACPI_STATUS(status); 115 } 116 } 117 118 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Resolved object %p\n", *stack_ptr)); 119 return_ACPI_STATUS(AE_OK); 120 } 121 122 /******************************************************************************* 123 * 124 * FUNCTION: acpi_ex_resolve_object_to_value 125 * 126 * PARAMETERS: stack_ptr - Pointer to an internal object 127 * walk_state - Current method state 128 * 129 * RETURN: Status 130 * 131 * DESCRIPTION: Retrieve the value from an internal object. The Reference type 132 * uses the associated AML opcode to determine the value. 133 * 134 ******************************************************************************/ 135 136 static acpi_status 137 acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr, 138 struct acpi_walk_state *walk_state) 139 { 140 acpi_status status = AE_OK; 141 union acpi_operand_object *stack_desc; 142 union acpi_operand_object *obj_desc = NULL; 143 u8 ref_type; 144 145 ACPI_FUNCTION_TRACE(ex_resolve_object_to_value); 146 147 stack_desc = *stack_ptr; 148 149 /* This is an object of type union acpi_operand_object */ 150 151 switch (stack_desc->common.type) { 152 case ACPI_TYPE_LOCAL_REFERENCE: 153 154 ref_type = stack_desc->reference.class; 155 156 switch (ref_type) { 157 case ACPI_REFCLASS_LOCAL: 158 case ACPI_REFCLASS_ARG: 159 /* 160 * Get the local from the method's state info 161 * Note: this increments the local's object reference count 162 */ 163 status = acpi_ds_method_data_get_value(ref_type, 164 stack_desc-> 165 reference.value, 166 walk_state, 167 &obj_desc); 168 if (ACPI_FAILURE(status)) { 169 return_ACPI_STATUS(status); 170 } 171 172 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 173 "[Arg/Local %X] ValueObj is %p\n", 174 stack_desc->reference.value, 175 obj_desc)); 176 177 /* 178 * Now we can delete the original Reference Object and 179 * replace it with the resolved value 180 */ 181 acpi_ut_remove_reference(stack_desc); 182 *stack_ptr = obj_desc; 183 break; 184 185 case ACPI_REFCLASS_INDEX: 186 187 switch (stack_desc->reference.target_type) { 188 case ACPI_TYPE_BUFFER_FIELD: 189 190 /* Just return - do not dereference */ 191 break; 192 193 case ACPI_TYPE_PACKAGE: 194 195 /* If method call or copy_object - do not dereference */ 196 197 if ((walk_state->opcode == 198 AML_INT_METHODCALL_OP) 199 || (walk_state->opcode == AML_COPY_OP)) { 200 break; 201 } 202 203 /* Otherwise, dereference the package_index to a package element */ 204 205 obj_desc = *stack_desc->reference.where; 206 if (obj_desc) { 207 /* 208 * Valid object descriptor, copy pointer to return value 209 * (i.e., dereference the package index) 210 * Delete the ref object, increment the returned object 211 */ 212 acpi_ut_remove_reference(stack_desc); 213 acpi_ut_add_reference(obj_desc); 214 *stack_ptr = obj_desc; 215 } else { 216 /* 217 * A NULL object descriptor means an uninitialized element of 218 * the package, can't dereference it 219 */ 220 ACPI_ERROR((AE_INFO, 221 "Attempt to dereference an Index to NULL package element Idx=%p", 222 stack_desc)); 223 status = AE_AML_UNINITIALIZED_ELEMENT; 224 } 225 break; 226 227 default: 228 229 /* Invalid reference object */ 230 231 ACPI_ERROR((AE_INFO, 232 "Unknown TargetType 0x%X in Index/Reference object %p", 233 stack_desc->reference.target_type, 234 stack_desc)); 235 status = AE_AML_INTERNAL; 236 break; 237 } 238 break; 239 240 case ACPI_REFCLASS_REFOF: 241 case ACPI_REFCLASS_DEBUG: 242 case ACPI_REFCLASS_TABLE: 243 244 /* Just leave the object as-is, do not dereference */ 245 246 break; 247 248 case ACPI_REFCLASS_NAME: /* Reference to a named object */ 249 250 /* Dereference the name */ 251 252 if ((stack_desc->reference.node->type == 253 ACPI_TYPE_DEVICE) 254 || (stack_desc->reference.node->type == 255 ACPI_TYPE_THERMAL)) { 256 257 /* These node types do not have 'real' subobjects */ 258 259 *stack_ptr = (void *)stack_desc->reference.node; 260 } else { 261 /* Get the object pointed to by the namespace node */ 262 263 *stack_ptr = 264 (stack_desc->reference.node)->object; 265 acpi_ut_add_reference(*stack_ptr); 266 } 267 268 acpi_ut_remove_reference(stack_desc); 269 break; 270 271 default: 272 273 ACPI_ERROR((AE_INFO, 274 "Unknown Reference type 0x%X in %p", 275 ref_type, stack_desc)); 276 status = AE_AML_INTERNAL; 277 break; 278 } 279 break; 280 281 case ACPI_TYPE_BUFFER: 282 283 status = acpi_ds_get_buffer_arguments(stack_desc); 284 break; 285 286 case ACPI_TYPE_PACKAGE: 287 288 status = acpi_ds_get_package_arguments(stack_desc); 289 break; 290 291 case ACPI_TYPE_BUFFER_FIELD: 292 case ACPI_TYPE_LOCAL_REGION_FIELD: 293 case ACPI_TYPE_LOCAL_BANK_FIELD: 294 case ACPI_TYPE_LOCAL_INDEX_FIELD: 295 296 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 297 "FieldRead SourceDesc=%p Type=%X\n", 298 stack_desc, stack_desc->common.type)); 299 300 status = 301 acpi_ex_read_data_from_field(walk_state, stack_desc, 302 &obj_desc); 303 304 /* Remove a reference to the original operand, then override */ 305 306 acpi_ut_remove_reference(*stack_ptr); 307 *stack_ptr = (void *)obj_desc; 308 break; 309 310 default: 311 312 break; 313 } 314 315 return_ACPI_STATUS(status); 316 } 317 318 /******************************************************************************* 319 * 320 * FUNCTION: acpi_ex_resolve_multiple 321 * 322 * PARAMETERS: walk_state - Current state (contains AML opcode) 323 * operand - Starting point for resolution 324 * return_type - Where the object type is returned 325 * return_desc - Where the resolved object is returned 326 * 327 * RETURN: Status 328 * 329 * DESCRIPTION: Return the base object and type. Traverse a reference list if 330 * necessary to get to the base object. 331 * 332 ******************************************************************************/ 333 334 acpi_status 335 acpi_ex_resolve_multiple(struct acpi_walk_state *walk_state, 336 union acpi_operand_object *operand, 337 acpi_object_type * return_type, 338 union acpi_operand_object **return_desc) 339 { 340 union acpi_operand_object *obj_desc = (void *)operand; 341 struct acpi_namespace_node *node; 342 acpi_object_type type; 343 acpi_status status; 344 345 ACPI_FUNCTION_TRACE(acpi_ex_resolve_multiple); 346 347 /* Operand can be either a namespace node or an operand descriptor */ 348 349 switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) { 350 case ACPI_DESC_TYPE_OPERAND: 351 352 type = obj_desc->common.type; 353 break; 354 355 case ACPI_DESC_TYPE_NAMED: 356 357 type = ((struct acpi_namespace_node *)obj_desc)->type; 358 obj_desc = 359 acpi_ns_get_attached_object((struct acpi_namespace_node *) 360 obj_desc); 361 362 /* If we had an Alias node, use the attached object for type info */ 363 364 if (type == ACPI_TYPE_LOCAL_ALIAS) { 365 type = ((struct acpi_namespace_node *)obj_desc)->type; 366 obj_desc = 367 acpi_ns_get_attached_object((struct 368 acpi_namespace_node *) 369 obj_desc); 370 } 371 break; 372 373 default: 374 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 375 } 376 377 /* If type is anything other than a reference, we are done */ 378 379 if (type != ACPI_TYPE_LOCAL_REFERENCE) { 380 goto exit; 381 } 382 383 /* 384 * For reference objects created via the ref_of, Index, or Load/load_table 385 * operators, we need to get to the base object (as per the ACPI 386 * specification of the object_type and size_of operators). This means 387 * traversing the list of possibly many nested references. 388 */ 389 while (obj_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) { 390 switch (obj_desc->reference.class) { 391 case ACPI_REFCLASS_REFOF: 392 case ACPI_REFCLASS_NAME: 393 394 /* Dereference the reference pointer */ 395 396 if (obj_desc->reference.class == ACPI_REFCLASS_REFOF) { 397 node = obj_desc->reference.object; 398 } else { /* AML_INT_NAMEPATH_OP */ 399 400 node = obj_desc->reference.node; 401 } 402 403 /* All "References" point to a NS node */ 404 405 if (ACPI_GET_DESCRIPTOR_TYPE(node) != 406 ACPI_DESC_TYPE_NAMED) { 407 ACPI_ERROR((AE_INFO, 408 "Not a namespace node %p [%s]", 409 node, 410 acpi_ut_get_descriptor_name(node))); 411 return_ACPI_STATUS(AE_AML_INTERNAL); 412 } 413 414 /* Get the attached object */ 415 416 obj_desc = acpi_ns_get_attached_object(node); 417 if (!obj_desc) { 418 419 /* No object, use the NS node type */ 420 421 type = acpi_ns_get_type(node); 422 goto exit; 423 } 424 425 /* Check for circular references */ 426 427 if (obj_desc == operand) { 428 return_ACPI_STATUS(AE_AML_CIRCULAR_REFERENCE); 429 } 430 break; 431 432 case ACPI_REFCLASS_INDEX: 433 434 /* Get the type of this reference (index into another object) */ 435 436 type = obj_desc->reference.target_type; 437 if (type != ACPI_TYPE_PACKAGE) { 438 goto exit; 439 } 440 441 /* 442 * The main object is a package, we want to get the type 443 * of the individual package element that is referenced by 444 * the index. 445 * 446 * This could of course in turn be another reference object. 447 */ 448 obj_desc = *(obj_desc->reference.where); 449 if (!obj_desc) { 450 451 /* NULL package elements are allowed */ 452 453 type = 0; /* Uninitialized */ 454 goto exit; 455 } 456 break; 457 458 case ACPI_REFCLASS_TABLE: 459 460 type = ACPI_TYPE_DDB_HANDLE; 461 goto exit; 462 463 case ACPI_REFCLASS_LOCAL: 464 case ACPI_REFCLASS_ARG: 465 466 if (return_desc) { 467 status = 468 acpi_ds_method_data_get_value(obj_desc-> 469 reference. 470 class, 471 obj_desc-> 472 reference. 473 value, 474 walk_state, 475 &obj_desc); 476 if (ACPI_FAILURE(status)) { 477 return_ACPI_STATUS(status); 478 } 479 acpi_ut_remove_reference(obj_desc); 480 } else { 481 status = 482 acpi_ds_method_data_get_node(obj_desc-> 483 reference. 484 class, 485 obj_desc-> 486 reference. 487 value, 488 walk_state, 489 &node); 490 if (ACPI_FAILURE(status)) { 491 return_ACPI_STATUS(status); 492 } 493 494 obj_desc = acpi_ns_get_attached_object(node); 495 if (!obj_desc) { 496 type = ACPI_TYPE_ANY; 497 goto exit; 498 } 499 } 500 break; 501 502 case ACPI_REFCLASS_DEBUG: 503 504 /* The Debug Object is of type "DebugObject" */ 505 506 type = ACPI_TYPE_DEBUG_OBJECT; 507 goto exit; 508 509 default: 510 511 ACPI_ERROR((AE_INFO, 512 "Unknown Reference Class 0x%2.2X", 513 obj_desc->reference.class)); 514 return_ACPI_STATUS(AE_AML_INTERNAL); 515 } 516 } 517 518 /* 519 * Now we are guaranteed to have an object that has not been created 520 * via the ref_of or Index operators. 521 */ 522 type = obj_desc->common.type; 523 524 exit: 525 /* Convert internal types to external types */ 526 527 switch (type) { 528 case ACPI_TYPE_LOCAL_REGION_FIELD: 529 case ACPI_TYPE_LOCAL_BANK_FIELD: 530 case ACPI_TYPE_LOCAL_INDEX_FIELD: 531 532 type = ACPI_TYPE_FIELD_UNIT; 533 break; 534 535 case ACPI_TYPE_LOCAL_SCOPE: 536 537 /* Per ACPI Specification, Scope is untyped */ 538 539 type = ACPI_TYPE_ANY; 540 break; 541 542 default: 543 544 /* No change to Type required */ 545 546 break; 547 } 548 549 *return_type = type; 550 if (return_desc) { 551 *return_desc = obj_desc; 552 } 553 return_ACPI_STATUS(AE_OK); 554 } 555