1 /****************************************************************************** 2 * 3 * Module Name: exresolv - AML Interpreter object resolution 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.h" 45 #include "accommon.h" 46 #include "amlcode.h" 47 #include "acdispat.h" 48 #include "acinterp.h" 49 #include "acnamesp.h" 50 51 52 #define _COMPONENT ACPI_EXECUTER 53 ACPI_MODULE_NAME ("exresolv") 54 55 /* Local prototypes */ 56 57 static ACPI_STATUS 58 AcpiExResolveObjectToValue ( 59 ACPI_OPERAND_OBJECT **StackPtr, 60 ACPI_WALK_STATE *WalkState); 61 62 63 /******************************************************************************* 64 * 65 * FUNCTION: AcpiExResolveToValue 66 * 67 * PARAMETERS: **StackPtr - Points to entry on ObjStack, which can 68 * be either an (ACPI_OPERAND_OBJECT *) 69 * or an ACPI_HANDLE. 70 * WalkState - Current method state 71 * 72 * RETURN: Status 73 * 74 * DESCRIPTION: Convert Reference objects to values 75 * 76 ******************************************************************************/ 77 78 ACPI_STATUS 79 AcpiExResolveToValue ( 80 ACPI_OPERAND_OBJECT **StackPtr, 81 ACPI_WALK_STATE *WalkState) 82 { 83 ACPI_STATUS Status; 84 85 86 ACPI_FUNCTION_TRACE_PTR (ExResolveToValue, StackPtr); 87 88 89 if (!StackPtr || !*StackPtr) 90 { 91 ACPI_ERROR ((AE_INFO, "Internal - null pointer")); 92 return_ACPI_STATUS (AE_AML_NO_OPERAND); 93 } 94 95 /* 96 * The entity pointed to by the StackPtr can be either 97 * 1) A valid ACPI_OPERAND_OBJECT, or 98 * 2) A ACPI_NAMESPACE_NODE (NamedObj) 99 */ 100 if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_OPERAND) 101 { 102 Status = AcpiExResolveObjectToValue (StackPtr, WalkState); 103 if (ACPI_FAILURE (Status)) 104 { 105 return_ACPI_STATUS (Status); 106 } 107 108 if (!*StackPtr) 109 { 110 ACPI_ERROR ((AE_INFO, "Internal - null pointer")); 111 return_ACPI_STATUS (AE_AML_NO_OPERAND); 112 } 113 } 114 115 /* 116 * Object on the stack may have changed if AcpiExResolveObjectToValue() 117 * was called (i.e., we can't use an _else_ here.) 118 */ 119 if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_NAMED) 120 { 121 Status = AcpiExResolveNodeToValue ( 122 ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, StackPtr), 123 WalkState); 124 if (ACPI_FAILURE (Status)) 125 { 126 return_ACPI_STATUS (Status); 127 } 128 } 129 130 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Resolved object %p\n", *StackPtr)); 131 return_ACPI_STATUS (AE_OK); 132 } 133 134 135 /******************************************************************************* 136 * 137 * FUNCTION: AcpiExResolveObjectToValue 138 * 139 * PARAMETERS: StackPtr - Pointer to an internal object 140 * WalkState - Current method state 141 * 142 * RETURN: Status 143 * 144 * DESCRIPTION: Retrieve the value from an internal object. The Reference type 145 * uses the associated AML opcode to determine the value. 146 * 147 ******************************************************************************/ 148 149 static ACPI_STATUS 150 AcpiExResolveObjectToValue ( 151 ACPI_OPERAND_OBJECT **StackPtr, 152 ACPI_WALK_STATE *WalkState) 153 { 154 ACPI_STATUS Status = AE_OK; 155 ACPI_OPERAND_OBJECT *StackDesc; 156 ACPI_OPERAND_OBJECT *ObjDesc = NULL; 157 UINT8 RefType; 158 159 160 ACPI_FUNCTION_TRACE (ExResolveObjectToValue); 161 162 163 StackDesc = *StackPtr; 164 165 /* This is an object of type ACPI_OPERAND_OBJECT */ 166 167 switch (StackDesc->Common.Type) 168 { 169 case ACPI_TYPE_LOCAL_REFERENCE: 170 171 RefType = StackDesc->Reference.Class; 172 173 switch (RefType) 174 { 175 case ACPI_REFCLASS_LOCAL: 176 case ACPI_REFCLASS_ARG: 177 /* 178 * Get the local from the method's state info 179 * Note: this increments the local's object reference count 180 */ 181 Status = AcpiDsMethodDataGetValue (RefType, 182 StackDesc->Reference.Value, WalkState, &ObjDesc); 183 if (ACPI_FAILURE (Status)) 184 { 185 return_ACPI_STATUS (Status); 186 } 187 188 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Arg/Local %X] ValueObj is %p\n", 189 StackDesc->Reference.Value, ObjDesc)); 190 191 /* 192 * Now we can delete the original Reference Object and 193 * replace it with the resolved value 194 */ 195 AcpiUtRemoveReference (StackDesc); 196 *StackPtr = ObjDesc; 197 break; 198 199 case ACPI_REFCLASS_INDEX: 200 201 switch (StackDesc->Reference.TargetType) 202 { 203 case ACPI_TYPE_BUFFER_FIELD: 204 205 /* Just return - do not dereference */ 206 break; 207 208 case ACPI_TYPE_PACKAGE: 209 210 /* If method call or CopyObject - do not dereference */ 211 212 if ((WalkState->Opcode == AML_INT_METHODCALL_OP) || 213 (WalkState->Opcode == AML_COPY_OP)) 214 { 215 break; 216 } 217 218 /* Otherwise, dereference the PackageIndex to a package element */ 219 220 ObjDesc = *StackDesc->Reference.Where; 221 if (ObjDesc) 222 { 223 /* 224 * Valid object descriptor, copy pointer to return value 225 * (i.e., dereference the package index) 226 * Delete the ref object, increment the returned object 227 */ 228 AcpiUtRemoveReference (StackDesc); 229 AcpiUtAddReference (ObjDesc); 230 *StackPtr = ObjDesc; 231 } 232 else 233 { 234 /* 235 * A NULL object descriptor means an uninitialized element of 236 * the package, can't dereference it 237 */ 238 ACPI_ERROR ((AE_INFO, 239 "Attempt to dereference an Index to NULL package element Idx=%p", 240 StackDesc)); 241 Status = AE_AML_UNINITIALIZED_ELEMENT; 242 } 243 break; 244 245 default: 246 247 /* Invalid reference object */ 248 249 ACPI_ERROR ((AE_INFO, 250 "Unknown TargetType 0x%X in Index/Reference object %p", 251 StackDesc->Reference.TargetType, StackDesc)); 252 Status = AE_AML_INTERNAL; 253 break; 254 } 255 break; 256 257 case ACPI_REFCLASS_REFOF: 258 case ACPI_REFCLASS_DEBUG: 259 case ACPI_REFCLASS_TABLE: 260 261 /* Just leave the object as-is, do not dereference */ 262 263 break; 264 265 case ACPI_REFCLASS_NAME: /* Reference to a named object */ 266 267 /* Dereference the name */ 268 269 if ((StackDesc->Reference.Node->Type == ACPI_TYPE_DEVICE) || 270 (StackDesc->Reference.Node->Type == ACPI_TYPE_THERMAL)) 271 { 272 /* These node types do not have 'real' subobjects */ 273 274 *StackPtr = (void *) StackDesc->Reference.Node; 275 } 276 else 277 { 278 /* Get the object pointed to by the namespace node */ 279 280 *StackPtr = (StackDesc->Reference.Node)->Object; 281 AcpiUtAddReference (*StackPtr); 282 } 283 284 AcpiUtRemoveReference (StackDesc); 285 break; 286 287 default: 288 289 ACPI_ERROR ((AE_INFO, 290 "Unknown Reference type 0x%X in %p", RefType, StackDesc)); 291 Status = AE_AML_INTERNAL; 292 break; 293 } 294 break; 295 296 case ACPI_TYPE_BUFFER: 297 298 Status = AcpiDsGetBufferArguments (StackDesc); 299 break; 300 301 case ACPI_TYPE_PACKAGE: 302 303 Status = AcpiDsGetPackageArguments (StackDesc); 304 break; 305 306 case ACPI_TYPE_BUFFER_FIELD: 307 case ACPI_TYPE_LOCAL_REGION_FIELD: 308 case ACPI_TYPE_LOCAL_BANK_FIELD: 309 case ACPI_TYPE_LOCAL_INDEX_FIELD: 310 311 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "FieldRead SourceDesc=%p Type=%X\n", 312 StackDesc, StackDesc->Common.Type)); 313 314 Status = AcpiExReadDataFromField (WalkState, StackDesc, &ObjDesc); 315 316 /* Remove a reference to the original operand, then override */ 317 318 AcpiUtRemoveReference (*StackPtr); 319 *StackPtr = (void *) ObjDesc; 320 break; 321 322 default: 323 324 break; 325 } 326 327 return_ACPI_STATUS (Status); 328 } 329 330 331 /******************************************************************************* 332 * 333 * FUNCTION: AcpiExResolveMultiple 334 * 335 * PARAMETERS: WalkState - Current state (contains AML opcode) 336 * Operand - Starting point for resolution 337 * ReturnType - Where the object type is returned 338 * ReturnDesc - Where the resolved object is returned 339 * 340 * RETURN: Status 341 * 342 * DESCRIPTION: Return the base object and type. Traverse a reference list if 343 * necessary to get to the base object. 344 * 345 ******************************************************************************/ 346 347 ACPI_STATUS 348 AcpiExResolveMultiple ( 349 ACPI_WALK_STATE *WalkState, 350 ACPI_OPERAND_OBJECT *Operand, 351 ACPI_OBJECT_TYPE *ReturnType, 352 ACPI_OPERAND_OBJECT **ReturnDesc) 353 { 354 ACPI_OPERAND_OBJECT *ObjDesc = ACPI_CAST_PTR (void, Operand); 355 ACPI_NAMESPACE_NODE *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Operand); 356 ACPI_OBJECT_TYPE Type; 357 ACPI_STATUS Status; 358 359 360 ACPI_FUNCTION_TRACE (AcpiExResolveMultiple); 361 362 363 /* Operand can be either a namespace node or an operand descriptor */ 364 365 switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc)) 366 { 367 case ACPI_DESC_TYPE_OPERAND: 368 369 Type = ObjDesc->Common.Type; 370 break; 371 372 case ACPI_DESC_TYPE_NAMED: 373 374 Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type; 375 ObjDesc = AcpiNsGetAttachedObject (Node); 376 377 /* If we had an Alias node, use the attached object for type info */ 378 379 if (Type == ACPI_TYPE_LOCAL_ALIAS) 380 { 381 Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type; 382 ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc); 383 } 384 385 if (!ObjDesc) 386 { 387 ACPI_ERROR ((AE_INFO, 388 "[%4.4s] Node is unresolved or uninitialized", 389 AcpiUtGetNodeName (Node))); 390 return_ACPI_STATUS (AE_AML_UNINITIALIZED_NODE); 391 } 392 break; 393 394 default: 395 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 396 } 397 398 /* If type is anything other than a reference, we are done */ 399 400 if (Type != ACPI_TYPE_LOCAL_REFERENCE) 401 { 402 goto Exit; 403 } 404 405 /* 406 * For reference objects created via the RefOf, Index, or Load/LoadTable 407 * operators, we need to get to the base object (as per the ACPI 408 * specification of the ObjectType and SizeOf operators). This means 409 * traversing the list of possibly many nested references. 410 */ 411 while (ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) 412 { 413 switch (ObjDesc->Reference.Class) 414 { 415 case ACPI_REFCLASS_REFOF: 416 case ACPI_REFCLASS_NAME: 417 418 /* Dereference the reference pointer */ 419 420 if (ObjDesc->Reference.Class == ACPI_REFCLASS_REFOF) 421 { 422 Node = ObjDesc->Reference.Object; 423 } 424 else /* AML_INT_NAMEPATH_OP */ 425 { 426 Node = ObjDesc->Reference.Node; 427 } 428 429 /* All "References" point to a NS node */ 430 431 if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED) 432 { 433 ACPI_ERROR ((AE_INFO, 434 "Not a namespace node %p [%s]", 435 Node, AcpiUtGetDescriptorName (Node))); 436 return_ACPI_STATUS (AE_AML_INTERNAL); 437 } 438 439 /* Get the attached object */ 440 441 ObjDesc = AcpiNsGetAttachedObject (Node); 442 if (!ObjDesc) 443 { 444 /* No object, use the NS node type */ 445 446 Type = AcpiNsGetType (Node); 447 goto Exit; 448 } 449 450 /* Check for circular references */ 451 452 if (ObjDesc == Operand) 453 { 454 return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE); 455 } 456 break; 457 458 case ACPI_REFCLASS_INDEX: 459 460 /* Get the type of this reference (index into another object) */ 461 462 Type = ObjDesc->Reference.TargetType; 463 if (Type != ACPI_TYPE_PACKAGE) 464 { 465 goto Exit; 466 } 467 468 /* 469 * The main object is a package, we want to get the type 470 * of the individual package element that is referenced by 471 * the index. 472 * 473 * This could of course in turn be another reference object. 474 */ 475 ObjDesc = *(ObjDesc->Reference.Where); 476 if (!ObjDesc) 477 { 478 /* NULL package elements are allowed */ 479 480 Type = 0; /* Uninitialized */ 481 goto Exit; 482 } 483 break; 484 485 case ACPI_REFCLASS_TABLE: 486 487 Type = ACPI_TYPE_DDB_HANDLE; 488 goto Exit; 489 490 case ACPI_REFCLASS_LOCAL: 491 case ACPI_REFCLASS_ARG: 492 493 if (ReturnDesc) 494 { 495 Status = AcpiDsMethodDataGetValue (ObjDesc->Reference.Class, 496 ObjDesc->Reference.Value, WalkState, &ObjDesc); 497 if (ACPI_FAILURE (Status)) 498 { 499 return_ACPI_STATUS (Status); 500 } 501 AcpiUtRemoveReference (ObjDesc); 502 } 503 else 504 { 505 Status = AcpiDsMethodDataGetNode (ObjDesc->Reference.Class, 506 ObjDesc->Reference.Value, WalkState, &Node); 507 if (ACPI_FAILURE (Status)) 508 { 509 return_ACPI_STATUS (Status); 510 } 511 512 ObjDesc = AcpiNsGetAttachedObject (Node); 513 if (!ObjDesc) 514 { 515 Type = ACPI_TYPE_ANY; 516 goto Exit; 517 } 518 } 519 break; 520 521 case ACPI_REFCLASS_DEBUG: 522 523 /* The Debug Object is of type "DebugObject" */ 524 525 Type = ACPI_TYPE_DEBUG_OBJECT; 526 goto Exit; 527 528 default: 529 530 ACPI_ERROR ((AE_INFO, 531 "Unknown Reference Class 0x%2.2X", ObjDesc->Reference.Class)); 532 return_ACPI_STATUS (AE_AML_INTERNAL); 533 } 534 } 535 536 /* 537 * Now we are guaranteed to have an object that has not been created 538 * via the RefOf or Index operators. 539 */ 540 Type = ObjDesc->Common.Type; 541 542 543 Exit: 544 /* Convert internal types to external types */ 545 546 switch (Type) 547 { 548 case ACPI_TYPE_LOCAL_REGION_FIELD: 549 case ACPI_TYPE_LOCAL_BANK_FIELD: 550 case ACPI_TYPE_LOCAL_INDEX_FIELD: 551 552 Type = ACPI_TYPE_FIELD_UNIT; 553 break; 554 555 case ACPI_TYPE_LOCAL_SCOPE: 556 557 /* Per ACPI Specification, Scope is untyped */ 558 559 Type = ACPI_TYPE_ANY; 560 break; 561 562 default: 563 564 /* No change to Type required */ 565 566 break; 567 } 568 569 *ReturnType = Type; 570 if (ReturnDesc) 571 { 572 *ReturnDesc = ObjDesc; 573 } 574 return_ACPI_STATUS (AE_OK); 575 } 576