1 /****************************************************************************** 2 * 3 * Module Name: exprep - ACPI AML (p-code) execution - field prep utilities 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2012, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 *****************************************************************************/ 115 116 #define __EXPREP_C__ 117 118 #include "acpi.h" 119 #include "accommon.h" 120 #include "acinterp.h" 121 #include "amlcode.h" 122 #include "acnamesp.h" 123 #include "acdispat.h" 124 125 126 #define _COMPONENT ACPI_EXECUTER 127 ACPI_MODULE_NAME ("exprep") 128 129 /* Local prototypes */ 130 131 static UINT32 132 AcpiExDecodeFieldAccess ( 133 ACPI_OPERAND_OBJECT *ObjDesc, 134 UINT8 FieldFlags, 135 UINT32 *ReturnByteAlignment); 136 137 138 #ifdef ACPI_UNDER_DEVELOPMENT 139 140 static UINT32 141 AcpiExGenerateAccess ( 142 UINT32 FieldBitOffset, 143 UINT32 FieldBitLength, 144 UINT32 RegionLength); 145 146 /******************************************************************************* 147 * 148 * FUNCTION: AcpiExGenerateAccess 149 * 150 * PARAMETERS: FieldBitOffset - Start of field within parent region/buffer 151 * FieldBitLength - Length of field in bits 152 * RegionLength - Length of parent in bytes 153 * 154 * RETURN: Field granularity (8, 16, 32 or 64) and 155 * ByteAlignment (1, 2, 3, or 4) 156 * 157 * DESCRIPTION: Generate an optimal access width for fields defined with the 158 * AnyAcc keyword. 159 * 160 * NOTE: Need to have the RegionLength in order to check for boundary 161 * conditions (end-of-region). However, the RegionLength is a deferred 162 * operation. Therefore, to complete this implementation, the generation 163 * of this access width must be deferred until the region length has 164 * been evaluated. 165 * 166 ******************************************************************************/ 167 168 static UINT32 169 AcpiExGenerateAccess ( 170 UINT32 FieldBitOffset, 171 UINT32 FieldBitLength, 172 UINT32 RegionLength) 173 { 174 UINT32 FieldByteLength; 175 UINT32 FieldByteOffset; 176 UINT32 FieldByteEndOffset; 177 UINT32 AccessByteWidth; 178 UINT32 FieldStartOffset; 179 UINT32 FieldEndOffset; 180 UINT32 MinimumAccessWidth = 0xFFFFFFFF; 181 UINT32 MinimumAccesses = 0xFFFFFFFF; 182 UINT32 Accesses; 183 184 185 ACPI_FUNCTION_TRACE (ExGenerateAccess); 186 187 188 /* Round Field start offset and length to "minimal" byte boundaries */ 189 190 FieldByteOffset = ACPI_DIV_8 (ACPI_ROUND_DOWN (FieldBitOffset, 8)); 191 FieldByteEndOffset = ACPI_DIV_8 (ACPI_ROUND_UP (FieldBitLength + 192 FieldBitOffset, 8)); 193 FieldByteLength = FieldByteEndOffset - FieldByteOffset; 194 195 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 196 "Bit length %u, Bit offset %u\n", 197 FieldBitLength, FieldBitOffset)); 198 199 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 200 "Byte Length %u, Byte Offset %u, End Offset %u\n", 201 FieldByteLength, FieldByteOffset, FieldByteEndOffset)); 202 203 /* 204 * Iterative search for the maximum access width that is both aligned 205 * and does not go beyond the end of the region 206 * 207 * Start at ByteAcc and work upwards to QwordAcc max. (1,2,4,8 bytes) 208 */ 209 for (AccessByteWidth = 1; AccessByteWidth <= 8; AccessByteWidth <<= 1) 210 { 211 /* 212 * 1) Round end offset up to next access boundary and make sure that 213 * this does not go beyond the end of the parent region. 214 * 2) When the Access width is greater than the FieldByteLength, we 215 * are done. (This does not optimize for the perfectly aligned 216 * case yet). 217 */ 218 if (ACPI_ROUND_UP (FieldByteEndOffset, AccessByteWidth) <= RegionLength) 219 { 220 FieldStartOffset = 221 ACPI_ROUND_DOWN (FieldByteOffset, AccessByteWidth) / 222 AccessByteWidth; 223 224 FieldEndOffset = 225 ACPI_ROUND_UP ((FieldByteLength + FieldByteOffset), 226 AccessByteWidth) / AccessByteWidth; 227 228 Accesses = FieldEndOffset - FieldStartOffset; 229 230 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 231 "AccessWidth %u end is within region\n", AccessByteWidth)); 232 233 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 234 "Field Start %u, Field End %u -- requires %u accesses\n", 235 FieldStartOffset, FieldEndOffset, Accesses)); 236 237 /* Single access is optimal */ 238 239 if (Accesses <= 1) 240 { 241 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 242 "Entire field can be accessed with one operation of size %u\n", 243 AccessByteWidth)); 244 return_VALUE (AccessByteWidth); 245 } 246 247 /* 248 * Fits in the region, but requires more than one read/write. 249 * try the next wider access on next iteration 250 */ 251 if (Accesses < MinimumAccesses) 252 { 253 MinimumAccesses = Accesses; 254 MinimumAccessWidth = AccessByteWidth; 255 } 256 } 257 else 258 { 259 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 260 "AccessWidth %u end is NOT within region\n", AccessByteWidth)); 261 if (AccessByteWidth == 1) 262 { 263 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 264 "Field goes beyond end-of-region!\n")); 265 266 /* Field does not fit in the region at all */ 267 268 return_VALUE (0); 269 } 270 271 /* 272 * This width goes beyond the end-of-region, back off to 273 * previous access 274 */ 275 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 276 "Backing off to previous optimal access width of %u\n", 277 MinimumAccessWidth)); 278 return_VALUE (MinimumAccessWidth); 279 } 280 } 281 282 /* 283 * Could not read/write field with one operation, 284 * just use max access width 285 */ 286 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 287 "Cannot access field in one operation, using width 8\n")); 288 return_VALUE (8); 289 } 290 #endif /* ACPI_UNDER_DEVELOPMENT */ 291 292 293 /******************************************************************************* 294 * 295 * FUNCTION: AcpiExDecodeFieldAccess 296 * 297 * PARAMETERS: ObjDesc - Field object 298 * FieldFlags - Encoded fieldflags (contains access bits) 299 * ReturnByteAlignment - Where the byte alignment is returned 300 * 301 * RETURN: Field granularity (8, 16, 32 or 64) and 302 * ByteAlignment (1, 2, 3, or 4) 303 * 304 * DESCRIPTION: Decode the AccessType bits of a field definition. 305 * 306 ******************************************************************************/ 307 308 static UINT32 309 AcpiExDecodeFieldAccess ( 310 ACPI_OPERAND_OBJECT *ObjDesc, 311 UINT8 FieldFlags, 312 UINT32 *ReturnByteAlignment) 313 { 314 UINT32 Access; 315 UINT32 ByteAlignment; 316 UINT32 BitLength; 317 318 319 ACPI_FUNCTION_TRACE (ExDecodeFieldAccess); 320 321 322 Access = (FieldFlags & AML_FIELD_ACCESS_TYPE_MASK); 323 324 switch (Access) 325 { 326 case AML_FIELD_ACCESS_ANY: 327 328 #ifdef ACPI_UNDER_DEVELOPMENT 329 ByteAlignment = 330 AcpiExGenerateAccess (ObjDesc->CommonField.StartFieldBitOffset, 331 ObjDesc->CommonField.BitLength, 332 0xFFFFFFFF /* Temp until we pass RegionLength as parameter */); 333 BitLength = ByteAlignment * 8; 334 #endif 335 336 ByteAlignment = 1; 337 BitLength = 8; 338 break; 339 340 case AML_FIELD_ACCESS_BYTE: 341 case AML_FIELD_ACCESS_BUFFER: /* ACPI 2.0 (SMBus Buffer) */ 342 ByteAlignment = 1; 343 BitLength = 8; 344 break; 345 346 case AML_FIELD_ACCESS_WORD: 347 ByteAlignment = 2; 348 BitLength = 16; 349 break; 350 351 case AML_FIELD_ACCESS_DWORD: 352 ByteAlignment = 4; 353 BitLength = 32; 354 break; 355 356 case AML_FIELD_ACCESS_QWORD: /* ACPI 2.0 */ 357 ByteAlignment = 8; 358 BitLength = 64; 359 break; 360 361 default: 362 /* Invalid field access type */ 363 364 ACPI_ERROR ((AE_INFO, 365 "Unknown field access type 0x%X", 366 Access)); 367 return_UINT32 (0); 368 } 369 370 if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD) 371 { 372 /* 373 * BufferField access can be on any byte boundary, so the 374 * ByteAlignment is always 1 byte -- regardless of any ByteAlignment 375 * implied by the field access type. 376 */ 377 ByteAlignment = 1; 378 } 379 380 *ReturnByteAlignment = ByteAlignment; 381 return_UINT32 (BitLength); 382 } 383 384 385 /******************************************************************************* 386 * 387 * FUNCTION: AcpiExPrepCommonFieldObject 388 * 389 * PARAMETERS: ObjDesc - The field object 390 * FieldFlags - Access, LockRule, and UpdateRule. 391 * The format of a FieldFlag is described 392 * in the ACPI specification 393 * FieldAttribute - Special attributes (not used) 394 * FieldBitPosition - Field start position 395 * FieldBitLength - Field length in number of bits 396 * 397 * RETURN: Status 398 * 399 * DESCRIPTION: Initialize the areas of the field object that are common 400 * to the various types of fields. Note: This is very "sensitive" 401 * code because we are solving the general case for field 402 * alignment. 403 * 404 ******************************************************************************/ 405 406 ACPI_STATUS 407 AcpiExPrepCommonFieldObject ( 408 ACPI_OPERAND_OBJECT *ObjDesc, 409 UINT8 FieldFlags, 410 UINT8 FieldAttribute, 411 UINT32 FieldBitPosition, 412 UINT32 FieldBitLength) 413 { 414 UINT32 AccessBitWidth; 415 UINT32 ByteAlignment; 416 UINT32 NearestByteAddress; 417 418 419 ACPI_FUNCTION_TRACE (ExPrepCommonFieldObject); 420 421 422 /* 423 * Note: the structure being initialized is the 424 * ACPI_COMMON_FIELD_INFO; No structure fields outside of the common 425 * area are initialized by this procedure. 426 */ 427 ObjDesc->CommonField.FieldFlags = FieldFlags; 428 ObjDesc->CommonField.Attribute = FieldAttribute; 429 ObjDesc->CommonField.BitLength = FieldBitLength; 430 431 /* 432 * Decode the access type so we can compute offsets. The access type gives 433 * two pieces of information - the width of each field access and the 434 * necessary ByteAlignment (address granularity) of the access. 435 * 436 * For AnyAcc, the AccessBitWidth is the largest width that is both 437 * necessary and possible in an attempt to access the whole field in one 438 * I/O operation. However, for AnyAcc, the ByteAlignment is always one 439 * byte. 440 * 441 * For all Buffer Fields, the ByteAlignment is always one byte. 442 * 443 * For all other access types (Byte, Word, Dword, Qword), the Bitwidth is 444 * the same (equivalent) as the ByteAlignment. 445 */ 446 AccessBitWidth = AcpiExDecodeFieldAccess (ObjDesc, FieldFlags, 447 &ByteAlignment); 448 if (!AccessBitWidth) 449 { 450 return_ACPI_STATUS (AE_AML_OPERAND_VALUE); 451 } 452 453 /* Setup width (access granularity) fields (values are: 1, 2, 4, 8) */ 454 455 ObjDesc->CommonField.AccessByteWidth = (UINT8) 456 ACPI_DIV_8 (AccessBitWidth); 457 458 /* 459 * BaseByteOffset is the address of the start of the field within the 460 * region. It is the byte address of the first *datum* (field-width data 461 * unit) of the field. (i.e., the first datum that contains at least the 462 * first *bit* of the field.) 463 * 464 * Note: ByteAlignment is always either equal to the AccessBitWidth or 8 465 * (Byte access), and it defines the addressing granularity of the parent 466 * region or buffer. 467 */ 468 NearestByteAddress = 469 ACPI_ROUND_BITS_DOWN_TO_BYTES (FieldBitPosition); 470 ObjDesc->CommonField.BaseByteOffset = (UINT32) 471 ACPI_ROUND_DOWN (NearestByteAddress, ByteAlignment); 472 473 /* 474 * StartFieldBitOffset is the offset of the first bit of the field within 475 * a field datum. 476 */ 477 ObjDesc->CommonField.StartFieldBitOffset = (UINT8) 478 (FieldBitPosition - ACPI_MUL_8 (ObjDesc->CommonField.BaseByteOffset)); 479 480 return_ACPI_STATUS (AE_OK); 481 } 482 483 484 /******************************************************************************* 485 * 486 * FUNCTION: AcpiExPrepFieldValue 487 * 488 * PARAMETERS: Info - Contains all field creation info 489 * 490 * RETURN: Status 491 * 492 * DESCRIPTION: Construct an object of type ACPI_OPERAND_OBJECT with a 493 * subtype of DefField and connect it to the parent Node. 494 * 495 ******************************************************************************/ 496 497 ACPI_STATUS 498 AcpiExPrepFieldValue ( 499 ACPI_CREATE_FIELD_INFO *Info) 500 { 501 ACPI_OPERAND_OBJECT *ObjDesc; 502 ACPI_OPERAND_OBJECT *SecondDesc = NULL; 503 ACPI_STATUS Status; 504 UINT32 AccessByteWidth; 505 UINT32 Type; 506 507 508 ACPI_FUNCTION_TRACE (ExPrepFieldValue); 509 510 511 /* Parameter validation */ 512 513 if (Info->FieldType != ACPI_TYPE_LOCAL_INDEX_FIELD) 514 { 515 if (!Info->RegionNode) 516 { 517 ACPI_ERROR ((AE_INFO, "Null RegionNode")); 518 return_ACPI_STATUS (AE_AML_NO_OPERAND); 519 } 520 521 Type = AcpiNsGetType (Info->RegionNode); 522 if (Type != ACPI_TYPE_REGION) 523 { 524 ACPI_ERROR ((AE_INFO, "Needed Region, found type 0x%X (%s)", 525 Type, AcpiUtGetTypeName (Type))); 526 527 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 528 } 529 } 530 531 /* Allocate a new field object */ 532 533 ObjDesc = AcpiUtCreateInternalObject (Info->FieldType); 534 if (!ObjDesc) 535 { 536 return_ACPI_STATUS (AE_NO_MEMORY); 537 } 538 539 /* Initialize areas of the object that are common to all fields */ 540 541 ObjDesc->CommonField.Node = Info->FieldNode; 542 Status = AcpiExPrepCommonFieldObject (ObjDesc, 543 Info->FieldFlags, Info->Attribute, 544 Info->FieldBitPosition, Info->FieldBitLength); 545 if (ACPI_FAILURE (Status)) 546 { 547 AcpiUtDeleteObjectDesc (ObjDesc); 548 return_ACPI_STATUS (Status); 549 } 550 551 /* Initialize areas of the object that are specific to the field type */ 552 553 switch (Info->FieldType) 554 { 555 case ACPI_TYPE_LOCAL_REGION_FIELD: 556 557 ObjDesc->Field.RegionObj = AcpiNsGetAttachedObject (Info->RegionNode); 558 559 /* Fields specific to GenericSerialBus fields */ 560 561 ObjDesc->Field.AccessLength = Info->AccessLength; 562 563 if (Info->ConnectionNode) 564 { 565 SecondDesc = Info->ConnectionNode->Object; 566 if (!(SecondDesc->Common.Flags & AOPOBJ_DATA_VALID)) 567 { 568 Status = AcpiDsGetBufferArguments (SecondDesc); 569 if (ACPI_FAILURE (Status)) 570 { 571 AcpiUtDeleteObjectDesc (ObjDesc); 572 return_ACPI_STATUS (Status); 573 } 574 } 575 576 ObjDesc->Field.ResourceBuffer = SecondDesc->Buffer.Pointer; 577 ObjDesc->Field.ResourceLength = (UINT16) SecondDesc->Buffer.Length; 578 } 579 else if (Info->ResourceBuffer) 580 { 581 ObjDesc->Field.ResourceBuffer = Info->ResourceBuffer; 582 ObjDesc->Field.ResourceLength = Info->ResourceLength; 583 } 584 585 /* Allow full data read from EC address space */ 586 587 if ((ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_EC) && 588 (ObjDesc->CommonField.BitLength > 8)) 589 { 590 AccessByteWidth = ACPI_ROUND_BITS_UP_TO_BYTES ( 591 ObjDesc->CommonField.BitLength); 592 593 /* Maximum byte width supported is 255 */ 594 595 if (AccessByteWidth < 256) 596 { 597 ObjDesc->CommonField.AccessByteWidth = (UINT8) AccessByteWidth; 598 } 599 } 600 601 /* An additional reference for the container */ 602 603 AcpiUtAddReference (ObjDesc->Field.RegionObj); 604 605 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 606 "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n", 607 ObjDesc->Field.StartFieldBitOffset, ObjDesc->Field.BaseByteOffset, 608 ObjDesc->Field.AccessByteWidth, ObjDesc->Field.RegionObj)); 609 break; 610 611 612 case ACPI_TYPE_LOCAL_BANK_FIELD: 613 614 ObjDesc->BankField.Value = Info->BankValue; 615 ObjDesc->BankField.RegionObj = 616 AcpiNsGetAttachedObject (Info->RegionNode); 617 ObjDesc->BankField.BankObj = 618 AcpiNsGetAttachedObject (Info->RegisterNode); 619 620 /* An additional reference for the attached objects */ 621 622 AcpiUtAddReference (ObjDesc->BankField.RegionObj); 623 AcpiUtAddReference (ObjDesc->BankField.BankObj); 624 625 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 626 "Bank Field: BitOff %X, Off %X, Gran %X, Region %p, BankReg %p\n", 627 ObjDesc->BankField.StartFieldBitOffset, 628 ObjDesc->BankField.BaseByteOffset, 629 ObjDesc->Field.AccessByteWidth, 630 ObjDesc->BankField.RegionObj, 631 ObjDesc->BankField.BankObj)); 632 633 /* 634 * Remember location in AML stream of the field unit 635 * opcode and operands -- since the BankValue 636 * operands must be evaluated. 637 */ 638 SecondDesc = ObjDesc->Common.NextObject; 639 SecondDesc->Extra.AmlStart = ACPI_CAST_PTR (ACPI_PARSE_OBJECT, 640 Info->DataRegisterNode)->Named.Data; 641 SecondDesc->Extra.AmlLength = ACPI_CAST_PTR (ACPI_PARSE_OBJECT, 642 Info->DataRegisterNode)->Named.Length; 643 644 break; 645 646 647 case ACPI_TYPE_LOCAL_INDEX_FIELD: 648 649 /* Get the Index and Data registers */ 650 651 ObjDesc->IndexField.IndexObj = 652 AcpiNsGetAttachedObject (Info->RegisterNode); 653 ObjDesc->IndexField.DataObj = 654 AcpiNsGetAttachedObject (Info->DataRegisterNode); 655 656 if (!ObjDesc->IndexField.DataObj || !ObjDesc->IndexField.IndexObj) 657 { 658 ACPI_ERROR ((AE_INFO, "Null Index Object during field prep")); 659 AcpiUtDeleteObjectDesc (ObjDesc); 660 return_ACPI_STATUS (AE_AML_INTERNAL); 661 } 662 663 /* An additional reference for the attached objects */ 664 665 AcpiUtAddReference (ObjDesc->IndexField.DataObj); 666 AcpiUtAddReference (ObjDesc->IndexField.IndexObj); 667 668 /* 669 * April 2006: Changed to match MS behavior 670 * 671 * The value written to the Index register is the byte offset of the 672 * target field in units of the granularity of the IndexField 673 * 674 * Previously, the value was calculated as an index in terms of the 675 * width of the Data register, as below: 676 * 677 * ObjDesc->IndexField.Value = (UINT32) 678 * (Info->FieldBitPosition / ACPI_MUL_8 ( 679 * ObjDesc->Field.AccessByteWidth)); 680 * 681 * February 2006: Tried value as a byte offset: 682 * ObjDesc->IndexField.Value = (UINT32) 683 * ACPI_DIV_8 (Info->FieldBitPosition); 684 */ 685 ObjDesc->IndexField.Value = (UINT32) ACPI_ROUND_DOWN ( 686 ACPI_DIV_8 (Info->FieldBitPosition), 687 ObjDesc->IndexField.AccessByteWidth); 688 689 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 690 "IndexField: BitOff %X, Off %X, Value %X, Gran %X, Index %p, Data %p\n", 691 ObjDesc->IndexField.StartFieldBitOffset, 692 ObjDesc->IndexField.BaseByteOffset, 693 ObjDesc->IndexField.Value, 694 ObjDesc->Field.AccessByteWidth, 695 ObjDesc->IndexField.IndexObj, 696 ObjDesc->IndexField.DataObj)); 697 break; 698 699 default: 700 /* No other types should get here */ 701 break; 702 } 703 704 /* 705 * Store the constructed descriptor (ObjDesc) into the parent Node, 706 * preserving the current type of that NamedObj. 707 */ 708 Status = AcpiNsAttachObject (Info->FieldNode, ObjDesc, 709 AcpiNsGetType (Info->FieldNode)); 710 711 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Set NamedObj %p [%4.4s], ObjDesc %p\n", 712 Info->FieldNode, AcpiUtGetNodeName (Info->FieldNode), ObjDesc)); 713 714 /* Remove local reference to the object */ 715 716 AcpiUtRemoveReference (ObjDesc); 717 return_ACPI_STATUS (Status); 718 } 719