| 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: dswstate - Dispatcher parse tree walk management routines |
| 4 | * |
| 5 | *****************************************************************************/ |
| 6 | |
| 7 | /* |
| 8 | * Copyright (C) 2000 - 2016, 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 "acparser.h" |
| 47 | #include "acdispat.h" |
| 48 | #include "acnamesp.h" |
| 49 | |
| 50 | #define _COMPONENT ACPI_DISPATCHER |
| 51 | ACPI_MODULE_NAME ("dswstate" ) |
| 52 | |
| 53 | /* Local prototypes */ |
| 54 | |
| 55 | static ACPI_STATUS |
| 56 | AcpiDsResultStackPush ( |
| 57 | ACPI_WALK_STATE *WalkState); |
| 58 | |
| 59 | static ACPI_STATUS |
| 60 | AcpiDsResultStackPop ( |
| 61 | ACPI_WALK_STATE *WalkState); |
| 62 | |
| 63 | |
| 64 | /******************************************************************************* |
| 65 | * |
| 66 | * FUNCTION: AcpiDsResultPop |
| 67 | * |
| 68 | * PARAMETERS: Object - Where to return the popped object |
| 69 | * WalkState - Current Walk state |
| 70 | * |
| 71 | * RETURN: Status |
| 72 | * |
| 73 | * DESCRIPTION: Pop an object off the top of this walk's result stack |
| 74 | * |
| 75 | ******************************************************************************/ |
| 76 | |
| 77 | ACPI_STATUS |
| 78 | AcpiDsResultPop ( |
| 79 | ACPI_OPERAND_OBJECT **Object, |
| 80 | ACPI_WALK_STATE *WalkState) |
| 81 | { |
| 82 | UINT32 Index; |
| 83 | ACPI_GENERIC_STATE *State; |
| 84 | ACPI_STATUS Status; |
| 85 | |
| 86 | |
| 87 | ACPI_FUNCTION_NAME (DsResultPop); |
| 88 | |
| 89 | |
| 90 | State = WalkState->Results; |
| 91 | |
| 92 | /* Incorrect state of result stack */ |
| 93 | |
| 94 | if (State && !WalkState->ResultCount) |
| 95 | { |
| 96 | ACPI_ERROR ((AE_INFO, "No results on result stack" )); |
| 97 | return (AE_AML_INTERNAL); |
| 98 | } |
| 99 | |
| 100 | if (!State && WalkState->ResultCount) |
| 101 | { |
| 102 | ACPI_ERROR ((AE_INFO, "No result state for result stack" )); |
| 103 | return (AE_AML_INTERNAL); |
| 104 | } |
| 105 | |
| 106 | /* Empty result stack */ |
| 107 | |
| 108 | if (!State) |
| 109 | { |
| 110 | ACPI_ERROR ((AE_INFO, "Result stack is empty! State=%p" , WalkState)); |
| 111 | return (AE_AML_NO_RETURN_VALUE); |
| 112 | } |
| 113 | |
| 114 | /* Return object of the top element and clean that top element result stack */ |
| 115 | |
| 116 | WalkState->ResultCount--; |
| 117 | Index = (UINT32) WalkState->ResultCount % ACPI_RESULTS_FRAME_OBJ_NUM; |
| 118 | |
| 119 | *Object = State->Results.ObjDesc [Index]; |
| 120 | if (!*Object) |
| 121 | { |
| 122 | ACPI_ERROR ((AE_INFO, "No result objects on result stack, State=%p" , |
| 123 | WalkState)); |
| 124 | return (AE_AML_NO_RETURN_VALUE); |
| 125 | } |
| 126 | |
| 127 | State->Results.ObjDesc [Index] = NULL; |
| 128 | if (Index == 0) |
| 129 | { |
| 130 | Status = AcpiDsResultStackPop (WalkState); |
| 131 | if (ACPI_FAILURE (Status)) |
| 132 | { |
| 133 | return (Status); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
| 138 | "Obj=%p [%s] Index=%X State=%p Num=%X\n" , *Object, |
| 139 | AcpiUtGetObjectTypeName (*Object), |
| 140 | Index, WalkState, WalkState->ResultCount)); |
| 141 | |
| 142 | return (AE_OK); |
| 143 | } |
| 144 | |
| 145 | |
| 146 | /******************************************************************************* |
| 147 | * |
| 148 | * FUNCTION: AcpiDsResultPush |
| 149 | * |
| 150 | * PARAMETERS: Object - Where to return the popped object |
| 151 | * WalkState - Current Walk state |
| 152 | * |
| 153 | * RETURN: Status |
| 154 | * |
| 155 | * DESCRIPTION: Push an object onto the current result stack |
| 156 | * |
| 157 | ******************************************************************************/ |
| 158 | |
| 159 | ACPI_STATUS |
| 160 | AcpiDsResultPush ( |
| 161 | ACPI_OPERAND_OBJECT *Object, |
| 162 | ACPI_WALK_STATE *WalkState) |
| 163 | { |
| 164 | ACPI_GENERIC_STATE *State; |
| 165 | ACPI_STATUS Status; |
| 166 | UINT32 Index; |
| 167 | |
| 168 | |
| 169 | ACPI_FUNCTION_NAME (DsResultPush); |
| 170 | |
| 171 | |
| 172 | if (WalkState->ResultCount > WalkState->ResultSize) |
| 173 | { |
| 174 | ACPI_ERROR ((AE_INFO, "Result stack is full" )); |
| 175 | return (AE_AML_INTERNAL); |
| 176 | } |
| 177 | else if (WalkState->ResultCount == WalkState->ResultSize) |
| 178 | { |
| 179 | /* Extend the result stack */ |
| 180 | |
| 181 | Status = AcpiDsResultStackPush (WalkState); |
| 182 | if (ACPI_FAILURE (Status)) |
| 183 | { |
| 184 | ACPI_ERROR ((AE_INFO, "Failed to extend the result stack" )); |
| 185 | return (Status); |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | if (!(WalkState->ResultCount < WalkState->ResultSize)) |
| 190 | { |
| 191 | ACPI_ERROR ((AE_INFO, "No free elements in result stack" )); |
| 192 | return (AE_AML_INTERNAL); |
| 193 | } |
| 194 | |
| 195 | State = WalkState->Results; |
| 196 | if (!State) |
| 197 | { |
| 198 | ACPI_ERROR ((AE_INFO, "No result stack frame during push" )); |
| 199 | return (AE_AML_INTERNAL); |
| 200 | } |
| 201 | |
| 202 | if (!Object) |
| 203 | { |
| 204 | ACPI_ERROR ((AE_INFO, |
| 205 | "Null Object! Obj=%p State=%p Num=%u" , |
| 206 | Object, WalkState, WalkState->ResultCount)); |
| 207 | return (AE_BAD_PARAMETER); |
| 208 | } |
| 209 | |
| 210 | /* Assign the address of object to the top free element of result stack */ |
| 211 | |
| 212 | Index = (UINT32) WalkState->ResultCount % ACPI_RESULTS_FRAME_OBJ_NUM; |
| 213 | State->Results.ObjDesc [Index] = Object; |
| 214 | WalkState->ResultCount++; |
| 215 | |
| 216 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n" , |
| 217 | Object, AcpiUtGetObjectTypeName ((ACPI_OPERAND_OBJECT *) Object), |
| 218 | WalkState, WalkState->ResultCount, WalkState->CurrentResult)); |
| 219 | |
| 220 | return (AE_OK); |
| 221 | } |
| 222 | |
| 223 | |
| 224 | /******************************************************************************* |
| 225 | * |
| 226 | * FUNCTION: AcpiDsResultStackPush |
| 227 | * |
| 228 | * PARAMETERS: WalkState - Current Walk state |
| 229 | * |
| 230 | * RETURN: Status |
| 231 | * |
| 232 | * DESCRIPTION: Push an object onto the WalkState result stack |
| 233 | * |
| 234 | ******************************************************************************/ |
| 235 | |
| 236 | static ACPI_STATUS |
| 237 | AcpiDsResultStackPush ( |
| 238 | ACPI_WALK_STATE *WalkState) |
| 239 | { |
| 240 | ACPI_GENERIC_STATE *State; |
| 241 | |
| 242 | |
| 243 | ACPI_FUNCTION_NAME (DsResultStackPush); |
| 244 | |
| 245 | |
| 246 | /* Check for stack overflow */ |
| 247 | |
| 248 | if (((UINT32) WalkState->ResultSize + ACPI_RESULTS_FRAME_OBJ_NUM) > |
| 249 | ACPI_RESULTS_OBJ_NUM_MAX) |
| 250 | { |
| 251 | ACPI_ERROR ((AE_INFO, "Result stack overflow: State=%p Num=%u" , |
| 252 | WalkState, WalkState->ResultSize)); |
| 253 | return (AE_STACK_OVERFLOW); |
| 254 | } |
| 255 | |
| 256 | State = AcpiUtCreateGenericState (); |
| 257 | if (!State) |
| 258 | { |
| 259 | return (AE_NO_MEMORY); |
| 260 | } |
| 261 | |
| 262 | State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_RESULT; |
| 263 | AcpiUtPushGenericState (&WalkState->Results, State); |
| 264 | |
| 265 | /* Increase the length of the result stack by the length of frame */ |
| 266 | |
| 267 | WalkState->ResultSize += ACPI_RESULTS_FRAME_OBJ_NUM; |
| 268 | |
| 269 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Results=%p State=%p\n" , |
| 270 | State, WalkState)); |
| 271 | |
| 272 | return (AE_OK); |
| 273 | } |
| 274 | |
| 275 | |
| 276 | /******************************************************************************* |
| 277 | * |
| 278 | * FUNCTION: AcpiDsResultStackPop |
| 279 | * |
| 280 | * PARAMETERS: WalkState - Current Walk state |
| 281 | * |
| 282 | * RETURN: Status |
| 283 | * |
| 284 | * DESCRIPTION: Pop an object off of the WalkState result stack |
| 285 | * |
| 286 | ******************************************************************************/ |
| 287 | |
| 288 | static ACPI_STATUS |
| 289 | AcpiDsResultStackPop ( |
| 290 | ACPI_WALK_STATE *WalkState) |
| 291 | { |
| 292 | ACPI_GENERIC_STATE *State; |
| 293 | |
| 294 | |
| 295 | ACPI_FUNCTION_NAME (DsResultStackPop); |
| 296 | |
| 297 | |
| 298 | /* Check for stack underflow */ |
| 299 | |
| 300 | if (WalkState->Results == NULL) |
| 301 | { |
| 302 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
| 303 | "Result stack underflow - State=%p\n" , WalkState)); |
| 304 | return (AE_AML_NO_OPERAND); |
| 305 | } |
| 306 | |
| 307 | if (WalkState->ResultSize < ACPI_RESULTS_FRAME_OBJ_NUM) |
| 308 | { |
| 309 | ACPI_ERROR ((AE_INFO, "Insufficient result stack size" )); |
| 310 | return (AE_AML_INTERNAL); |
| 311 | } |
| 312 | |
| 313 | State = AcpiUtPopGenericState (&WalkState->Results); |
| 314 | AcpiUtDeleteGenericState (State); |
| 315 | |
| 316 | /* Decrease the length of result stack by the length of frame */ |
| 317 | |
| 318 | WalkState->ResultSize -= ACPI_RESULTS_FRAME_OBJ_NUM; |
| 319 | |
| 320 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
| 321 | "Result=%p RemainingResults=%X State=%p\n" , |
| 322 | State, WalkState->ResultCount, WalkState)); |
| 323 | |
| 324 | return (AE_OK); |
| 325 | } |
| 326 | |
| 327 | |
| 328 | /******************************************************************************* |
| 329 | * |
| 330 | * FUNCTION: AcpiDsObjStackPush |
| 331 | * |
| 332 | * PARAMETERS: Object - Object to push |
| 333 | * WalkState - Current Walk state |
| 334 | * |
| 335 | * RETURN: Status |
| 336 | * |
| 337 | * DESCRIPTION: Push an object onto this walk's object/operand stack |
| 338 | * |
| 339 | ******************************************************************************/ |
| 340 | |
| 341 | ACPI_STATUS |
| 342 | AcpiDsObjStackPush ( |
| 343 | void *Object, |
| 344 | ACPI_WALK_STATE *WalkState) |
| 345 | { |
| 346 | ACPI_FUNCTION_NAME (DsObjStackPush); |
| 347 | |
| 348 | |
| 349 | /* Check for stack overflow */ |
| 350 | |
| 351 | if (WalkState->NumOperands >= ACPI_OBJ_NUM_OPERANDS) |
| 352 | { |
| 353 | ACPI_ERROR ((AE_INFO, |
| 354 | "Object stack overflow! Obj=%p State=%p #Ops=%u" , |
| 355 | Object, WalkState, WalkState->NumOperands)); |
| 356 | return (AE_STACK_OVERFLOW); |
| 357 | } |
| 358 | |
| 359 | /* Put the object onto the stack */ |
| 360 | |
| 361 | WalkState->Operands [WalkState->OperandIndex] = Object; |
| 362 | WalkState->NumOperands++; |
| 363 | |
| 364 | /* For the usual order of filling the operand stack */ |
| 365 | |
| 366 | WalkState->OperandIndex++; |
| 367 | |
| 368 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n" , |
| 369 | Object, AcpiUtGetObjectTypeName ((ACPI_OPERAND_OBJECT *) Object), |
| 370 | WalkState, WalkState->NumOperands)); |
| 371 | |
| 372 | return (AE_OK); |
| 373 | } |
| 374 | |
| 375 | |
| 376 | /******************************************************************************* |
| 377 | * |
| 378 | * FUNCTION: AcpiDsObjStackPop |
| 379 | * |
| 380 | * PARAMETERS: PopCount - Number of objects/entries to pop |
| 381 | * WalkState - Current Walk state |
| 382 | * |
| 383 | * RETURN: Status |
| 384 | * |
| 385 | * DESCRIPTION: Pop this walk's object stack. Objects on the stack are NOT |
| 386 | * deleted by this routine. |
| 387 | * |
| 388 | ******************************************************************************/ |
| 389 | |
| 390 | ACPI_STATUS |
| 391 | AcpiDsObjStackPop ( |
| 392 | UINT32 PopCount, |
| 393 | ACPI_WALK_STATE *WalkState) |
| 394 | { |
| 395 | UINT32 i; |
| 396 | |
| 397 | |
| 398 | ACPI_FUNCTION_NAME (DsObjStackPop); |
| 399 | |
| 400 | |
| 401 | for (i = 0; i < PopCount; i++) |
| 402 | { |
| 403 | /* Check for stack underflow */ |
| 404 | |
| 405 | if (WalkState->NumOperands == 0) |
| 406 | { |
| 407 | ACPI_ERROR ((AE_INFO, |
| 408 | "Object stack underflow! Count=%X State=%p #Ops=%u" , |
| 409 | PopCount, WalkState, WalkState->NumOperands)); |
| 410 | return (AE_STACK_UNDERFLOW); |
| 411 | } |
| 412 | |
| 413 | /* Just set the stack entry to null */ |
| 414 | |
| 415 | WalkState->NumOperands--; |
| 416 | WalkState->Operands [WalkState->NumOperands] = NULL; |
| 417 | } |
| 418 | |
| 419 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%u\n" , |
| 420 | PopCount, WalkState, WalkState->NumOperands)); |
| 421 | |
| 422 | return (AE_OK); |
| 423 | } |
| 424 | |
| 425 | |
| 426 | /******************************************************************************* |
| 427 | * |
| 428 | * FUNCTION: AcpiDsObjStackPopAndDelete |
| 429 | * |
| 430 | * PARAMETERS: PopCount - Number of objects/entries to pop |
| 431 | * WalkState - Current Walk state |
| 432 | * |
| 433 | * RETURN: Status |
| 434 | * |
| 435 | * DESCRIPTION: Pop this walk's object stack and delete each object that is |
| 436 | * popped off. |
| 437 | * |
| 438 | ******************************************************************************/ |
| 439 | |
| 440 | void |
| 441 | AcpiDsObjStackPopAndDelete ( |
| 442 | UINT32 PopCount, |
| 443 | ACPI_WALK_STATE *WalkState) |
| 444 | { |
| 445 | INT32 i; |
| 446 | ACPI_OPERAND_OBJECT *ObjDesc; |
| 447 | |
| 448 | |
| 449 | ACPI_FUNCTION_NAME (DsObjStackPopAndDelete); |
| 450 | |
| 451 | |
| 452 | if (PopCount == 0) |
| 453 | { |
| 454 | return; |
| 455 | } |
| 456 | |
| 457 | for (i = (INT32) PopCount - 1; i >= 0; i--) |
| 458 | { |
| 459 | if (WalkState->NumOperands == 0) |
| 460 | { |
| 461 | return; |
| 462 | } |
| 463 | |
| 464 | /* Pop the stack and delete an object if present in this stack entry */ |
| 465 | |
| 466 | WalkState->NumOperands--; |
| 467 | ObjDesc = WalkState->Operands [i]; |
| 468 | if (ObjDesc) |
| 469 | { |
| 470 | AcpiUtRemoveReference (WalkState->Operands [i]); |
| 471 | WalkState->Operands [i] = NULL; |
| 472 | } |
| 473 | } |
| 474 | |
| 475 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n" , |
| 476 | PopCount, WalkState, WalkState->NumOperands)); |
| 477 | } |
| 478 | |
| 479 | |
| 480 | /******************************************************************************* |
| 481 | * |
| 482 | * FUNCTION: AcpiDsGetCurrentWalkState |
| 483 | * |
| 484 | * PARAMETERS: Thread - Get current active state for this Thread |
| 485 | * |
| 486 | * RETURN: Pointer to the current walk state |
| 487 | * |
| 488 | * DESCRIPTION: Get the walk state that is at the head of the list (the "current" |
| 489 | * walk state.) |
| 490 | * |
| 491 | ******************************************************************************/ |
| 492 | |
| 493 | ACPI_WALK_STATE * |
| 494 | AcpiDsGetCurrentWalkState ( |
| 495 | ACPI_THREAD_STATE *Thread) |
| 496 | { |
| 497 | ACPI_FUNCTION_NAME (DsGetCurrentWalkState); |
| 498 | |
| 499 | |
| 500 | if (!Thread) |
| 501 | { |
| 502 | return (NULL); |
| 503 | } |
| 504 | |
| 505 | ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Current WalkState %p\n" , |
| 506 | Thread->WalkStateList)); |
| 507 | |
| 508 | return (Thread->WalkStateList); |
| 509 | } |
| 510 | |
| 511 | |
| 512 | /******************************************************************************* |
| 513 | * |
| 514 | * FUNCTION: AcpiDsPushWalkState |
| 515 | * |
| 516 | * PARAMETERS: WalkState - State to push |
| 517 | * Thread - Thread state object |
| 518 | * |
| 519 | * RETURN: None |
| 520 | * |
| 521 | * DESCRIPTION: Place the Thread state at the head of the state list |
| 522 | * |
| 523 | ******************************************************************************/ |
| 524 | |
| 525 | void |
| 526 | AcpiDsPushWalkState ( |
| 527 | ACPI_WALK_STATE *WalkState, |
| 528 | ACPI_THREAD_STATE *Thread) |
| 529 | { |
| 530 | ACPI_FUNCTION_TRACE (DsPushWalkState); |
| 531 | |
| 532 | |
| 533 | WalkState->Next = Thread->WalkStateList; |
| 534 | Thread->WalkStateList = WalkState; |
| 535 | |
| 536 | return_VOID; |
| 537 | } |
| 538 | |
| 539 | |
| 540 | /******************************************************************************* |
| 541 | * |
| 542 | * FUNCTION: AcpiDsPopWalkState |
| 543 | * |
| 544 | * PARAMETERS: Thread - Current thread state |
| 545 | * |
| 546 | * RETURN: A WalkState object popped from the thread's stack |
| 547 | * |
| 548 | * DESCRIPTION: Remove and return the walkstate object that is at the head of |
| 549 | * the walk stack for the given walk list. NULL indicates that |
| 550 | * the list is empty. |
| 551 | * |
| 552 | ******************************************************************************/ |
| 553 | |
| 554 | ACPI_WALK_STATE * |
| 555 | AcpiDsPopWalkState ( |
| 556 | ACPI_THREAD_STATE *Thread) |
| 557 | { |
| 558 | ACPI_WALK_STATE *WalkState; |
| 559 | |
| 560 | |
| 561 | ACPI_FUNCTION_TRACE (DsPopWalkState); |
| 562 | |
| 563 | |
| 564 | WalkState = Thread->WalkStateList; |
| 565 | |
| 566 | if (WalkState) |
| 567 | { |
| 568 | /* Next walk state becomes the current walk state */ |
| 569 | |
| 570 | Thread->WalkStateList = WalkState->Next; |
| 571 | |
| 572 | /* |
| 573 | * Don't clear the NEXT field, this serves as an indicator |
| 574 | * that there is a parent WALK STATE |
| 575 | * Do Not: WalkState->Next = NULL; |
| 576 | */ |
| 577 | } |
| 578 | |
| 579 | return_PTR (WalkState); |
| 580 | } |
| 581 | |
| 582 | |
| 583 | /******************************************************************************* |
| 584 | * |
| 585 | * FUNCTION: AcpiDsCreateWalkState |
| 586 | * |
| 587 | * PARAMETERS: OwnerId - ID for object creation |
| 588 | * Origin - Starting point for this walk |
| 589 | * MethodDesc - Method object |
| 590 | * Thread - Current thread state |
| 591 | * |
| 592 | * RETURN: Pointer to the new walk state. |
| 593 | * |
| 594 | * DESCRIPTION: Allocate and initialize a new walk state. The current walk |
| 595 | * state is set to this new state. |
| 596 | * |
| 597 | ******************************************************************************/ |
| 598 | |
| 599 | ACPI_WALK_STATE * |
| 600 | AcpiDsCreateWalkState ( |
| 601 | ACPI_OWNER_ID OwnerId, |
| 602 | ACPI_PARSE_OBJECT *Origin, |
| 603 | ACPI_OPERAND_OBJECT *MethodDesc, |
| 604 | ACPI_THREAD_STATE *Thread) |
| 605 | { |
| 606 | ACPI_WALK_STATE *WalkState; |
| 607 | |
| 608 | |
| 609 | ACPI_FUNCTION_TRACE (DsCreateWalkState); |
| 610 | |
| 611 | |
| 612 | WalkState = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_WALK_STATE)); |
| 613 | if (!WalkState) |
| 614 | { |
| 615 | return_PTR (NULL); |
| 616 | } |
| 617 | |
| 618 | WalkState->DescriptorType = ACPI_DESC_TYPE_WALK; |
| 619 | WalkState->MethodDesc = MethodDesc; |
| 620 | WalkState->OwnerId = OwnerId; |
| 621 | WalkState->Origin = Origin; |
| 622 | WalkState->Thread = Thread; |
| 623 | |
| 624 | WalkState->ParserState.StartOp = Origin; |
| 625 | |
| 626 | /* Init the method args/local */ |
| 627 | |
| 628 | #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY)) |
| 629 | AcpiDsMethodDataInit (WalkState); |
| 630 | #endif |
| 631 | |
| 632 | /* Put the new state at the head of the walk list */ |
| 633 | |
| 634 | if (Thread) |
| 635 | { |
| 636 | AcpiDsPushWalkState (WalkState, Thread); |
| 637 | } |
| 638 | |
| 639 | return_PTR (WalkState); |
| 640 | } |
| 641 | |
| 642 | |
| 643 | /******************************************************************************* |
| 644 | * |
| 645 | * FUNCTION: AcpiDsInitAmlWalk |
| 646 | * |
| 647 | * PARAMETERS: WalkState - New state to be initialized |
| 648 | * Op - Current parse op |
| 649 | * MethodNode - Control method NS node, if any |
| 650 | * AmlStart - Start of AML |
| 651 | * AmlLength - Length of AML |
| 652 | * Info - Method info block (params, etc.) |
| 653 | * PassNumber - 1, 2, or 3 |
| 654 | * |
| 655 | * RETURN: Status |
| 656 | * |
| 657 | * DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk |
| 658 | * |
| 659 | ******************************************************************************/ |
| 660 | |
| 661 | ACPI_STATUS |
| 662 | AcpiDsInitAmlWalk ( |
| 663 | ACPI_WALK_STATE *WalkState, |
| 664 | ACPI_PARSE_OBJECT *Op, |
| 665 | ACPI_NAMESPACE_NODE *MethodNode, |
| 666 | UINT8 *AmlStart, |
| 667 | UINT32 AmlLength, |
| 668 | ACPI_EVALUATE_INFO *Info, |
| 669 | UINT8 PassNumber) |
| 670 | { |
| 671 | ACPI_STATUS Status; |
| 672 | ACPI_PARSE_STATE *ParserState = &WalkState->ParserState; |
| 673 | ACPI_PARSE_OBJECT *; |
| 674 | |
| 675 | |
| 676 | ACPI_FUNCTION_TRACE (DsInitAmlWalk); |
| 677 | |
| 678 | |
| 679 | WalkState->ParserState.Aml = |
| 680 | WalkState->ParserState.AmlStart = AmlStart; |
| 681 | WalkState->ParserState.AmlEnd = |
| 682 | WalkState->ParserState.PkgEnd = AmlStart + AmlLength; |
| 683 | |
| 684 | /* The NextOp of the NextWalk will be the beginning of the method */ |
| 685 | |
| 686 | WalkState->NextOp = NULL; |
| 687 | WalkState->PassNumber = PassNumber; |
| 688 | |
| 689 | if (Info) |
| 690 | { |
| 691 | WalkState->Params = Info->Parameters; |
| 692 | WalkState->CallerReturnDesc = &Info->ReturnObject; |
| 693 | } |
| 694 | |
| 695 | Status = AcpiPsInitScope (&WalkState->ParserState, Op); |
| 696 | if (ACPI_FAILURE (Status)) |
| 697 | { |
| 698 | return_ACPI_STATUS (Status); |
| 699 | } |
| 700 | |
| 701 | if (MethodNode) |
| 702 | { |
| 703 | WalkState->ParserState.StartNode = MethodNode; |
| 704 | WalkState->WalkType = ACPI_WALK_METHOD; |
| 705 | WalkState->MethodNode = MethodNode; |
| 706 | WalkState->MethodDesc = AcpiNsGetAttachedObject (MethodNode); |
| 707 | |
| 708 | /* Push start scope on scope stack and make it current */ |
| 709 | |
| 710 | Status = AcpiDsScopeStackPush ( |
| 711 | MethodNode, ACPI_TYPE_METHOD, WalkState); |
| 712 | if (ACPI_FAILURE (Status)) |
| 713 | { |
| 714 | return_ACPI_STATUS (Status); |
| 715 | } |
| 716 | |
| 717 | /* Init the method arguments */ |
| 718 | |
| 719 | Status = AcpiDsMethodDataInitArgs (WalkState->Params, |
| 720 | ACPI_METHOD_NUM_ARGS, WalkState); |
| 721 | if (ACPI_FAILURE (Status)) |
| 722 | { |
| 723 | return_ACPI_STATUS (Status); |
| 724 | } |
| 725 | } |
| 726 | else |
| 727 | { |
| 728 | /* |
| 729 | * Setup the current scope. |
| 730 | * Find a Named Op that has a namespace node associated with it. |
| 731 | * search upwards from this Op. Current scope is the first |
| 732 | * Op with a namespace node. |
| 733 | */ |
| 734 | ExtraOp = ParserState->StartOp; |
| 735 | while (ExtraOp && !ExtraOp->Common.Node) |
| 736 | { |
| 737 | ExtraOp = ExtraOp->Common.Parent; |
| 738 | } |
| 739 | |
| 740 | if (!ExtraOp) |
| 741 | { |
| 742 | ParserState->StartNode = NULL; |
| 743 | } |
| 744 | else |
| 745 | { |
| 746 | ParserState->StartNode = ExtraOp->Common.Node; |
| 747 | } |
| 748 | |
| 749 | if (ParserState->StartNode) |
| 750 | { |
| 751 | /* Push start scope on scope stack and make it current */ |
| 752 | |
| 753 | Status = AcpiDsScopeStackPush (ParserState->StartNode, |
| 754 | ParserState->StartNode->Type, WalkState); |
| 755 | if (ACPI_FAILURE (Status)) |
| 756 | { |
| 757 | return_ACPI_STATUS (Status); |
| 758 | } |
| 759 | } |
| 760 | } |
| 761 | |
| 762 | Status = AcpiDsInitCallbacks (WalkState, PassNumber); |
| 763 | return_ACPI_STATUS (Status); |
| 764 | } |
| 765 | |
| 766 | |
| 767 | /******************************************************************************* |
| 768 | * |
| 769 | * FUNCTION: AcpiDsDeleteWalkState |
| 770 | * |
| 771 | * PARAMETERS: WalkState - State to delete |
| 772 | * |
| 773 | * RETURN: Status |
| 774 | * |
| 775 | * DESCRIPTION: Delete a walk state including all internal data structures |
| 776 | * |
| 777 | ******************************************************************************/ |
| 778 | |
| 779 | void |
| 780 | AcpiDsDeleteWalkState ( |
| 781 | ACPI_WALK_STATE *WalkState) |
| 782 | { |
| 783 | ACPI_GENERIC_STATE *State; |
| 784 | |
| 785 | |
| 786 | ACPI_FUNCTION_TRACE_PTR (DsDeleteWalkState, WalkState); |
| 787 | |
| 788 | |
| 789 | if (!WalkState) |
| 790 | { |
| 791 | return_VOID; |
| 792 | } |
| 793 | |
| 794 | if (WalkState->DescriptorType != ACPI_DESC_TYPE_WALK) |
| 795 | { |
| 796 | ACPI_ERROR ((AE_INFO, "%p is not a valid walk state" , |
| 797 | WalkState)); |
| 798 | return_VOID; |
| 799 | } |
| 800 | |
| 801 | /* There should not be any open scopes */ |
| 802 | |
| 803 | if (WalkState->ParserState.Scope) |
| 804 | { |
| 805 | ACPI_ERROR ((AE_INFO, "%p walk still has a scope list" , |
| 806 | WalkState)); |
| 807 | AcpiPsCleanupScope (&WalkState->ParserState); |
| 808 | } |
| 809 | |
| 810 | /* Always must free any linked control states */ |
| 811 | |
| 812 | while (WalkState->ControlState) |
| 813 | { |
| 814 | State = WalkState->ControlState; |
| 815 | WalkState->ControlState = State->Common.Next; |
| 816 | |
| 817 | AcpiUtDeleteGenericState (State); |
| 818 | } |
| 819 | |
| 820 | /* Always must free any linked parse states */ |
| 821 | |
| 822 | while (WalkState->ScopeInfo) |
| 823 | { |
| 824 | State = WalkState->ScopeInfo; |
| 825 | WalkState->ScopeInfo = State->Common.Next; |
| 826 | |
| 827 | AcpiUtDeleteGenericState (State); |
| 828 | } |
| 829 | |
| 830 | /* Always must free any stacked result states */ |
| 831 | |
| 832 | while (WalkState->Results) |
| 833 | { |
| 834 | State = WalkState->Results; |
| 835 | WalkState->Results = State->Common.Next; |
| 836 | |
| 837 | AcpiUtDeleteGenericState (State); |
| 838 | } |
| 839 | |
| 840 | ACPI_FREE (WalkState); |
| 841 | return_VOID; |
| 842 | } |
| 843 | |