1 /****************************************************************************** 2 * 3 * Module Name: exprep - ACPI AML field prep utilities 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2016, 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 #include "acpi.h" 117 #include "accommon.h" 118 #include "acinterp.h" 119 #include "amlcode.h" 120 #include "acnamesp.h" 121 #include "acdispat.h" 122 123 124 #define _COMPONENT ACPI_EXECUTER 125 ACPI_MODULE_NAME ("exprep") 126 127 /* Local prototypes */ 128 129 static UINT32 130 AcpiExDecodeFieldAccess ( 131 ACPI_OPERAND_OBJECT *ObjDesc, 132 UINT8 FieldFlags, 133 UINT32 *ReturnByteAlignment); 134 135 136 #ifdef ACPI_UNDER_DEVELOPMENT 137 138 static UINT32 139 AcpiExGenerateAccess ( 140 UINT32 FieldBitOffset, 141 UINT32 FieldBitLength, 142 UINT32 RegionLength); 143 144 145 /******************************************************************************* 146 * 147 * FUNCTION: AcpiExGenerateAccess 148 * 149 * PARAMETERS: FieldBitOffset - Start of field within parent region/buffer 150 * FieldBitLength - Length of field in bits 151 * RegionLength - Length of parent in bytes 152 * 153 * RETURN: Field granularity (8, 16, 32 or 64) and 154 * ByteAlignment (1, 2, 3, or 4) 155 * 156 * DESCRIPTION: Generate an optimal access width for fields defined with the 157 * AnyAcc keyword. 158 * 159 * NOTE: Need to have the RegionLength in order to check for boundary 160 * conditions (end-of-region). However, the RegionLength is a deferred 161 * operation. Therefore, to complete this implementation, the generation 162 * of this access width must be deferred until the region length has 163 * been evaluated. 164 * 165 ******************************************************************************/ 166 167 static UINT32 168 AcpiExGenerateAccess ( 169 UINT32 FieldBitOffset, 170 UINT32 FieldBitLength, 171 UINT32 RegionLength) 172 { 173 UINT32 FieldByteLength; 174 UINT32 FieldByteOffset; 175 UINT32 FieldByteEndOffset; 176 UINT32 AccessByteWidth; 177 UINT32 FieldStartOffset; 178 UINT32 FieldEndOffset; 179 UINT32 MinimumAccessWidth = 0xFFFFFFFF; 180 UINT32 MinimumAccesses = 0xFFFFFFFF; 181 UINT32 Accesses; 182 183 184 ACPI_FUNCTION_TRACE (ExGenerateAccess); 185 186 187 /* Round Field start offset and length to "minimal" byte boundaries */ 188 189 FieldByteOffset = ACPI_DIV_8 ( 190 ACPI_ROUND_DOWN (FieldBitOffset, 8)); 191 192 FieldByteEndOffset = ACPI_DIV_8 ( 193 ACPI_ROUND_UP (FieldBitLength + FieldBitOffset, 8)); 194 195 FieldByteLength = FieldByteEndOffset - FieldByteOffset; 196 197 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 198 "Bit length %u, Bit offset %u\n", 199 FieldBitLength, FieldBitOffset)); 200 201 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 202 "Byte Length %u, Byte Offset %u, End Offset %u\n", 203 FieldByteLength, FieldByteOffset, FieldByteEndOffset)); 204 205 /* 206 * Iterative search for the maximum access width that is both aligned 207 * and does not go beyond the end of the region 208 * 209 * Start at ByteAcc and work upwards to QwordAcc max. (1,2,4,8 bytes) 210 */ 211 for (AccessByteWidth = 1; AccessByteWidth <= 8; AccessByteWidth <<= 1) 212 { 213 /* 214 * 1) Round end offset up to next access boundary and make sure that 215 * this does not go beyond the end of the parent region. 216 * 2) When the Access width is greater than the FieldByteLength, we 217 * are done. (This does not optimize for the perfectly aligned 218 * case yet). 219 */ 220 if (ACPI_ROUND_UP (FieldByteEndOffset, AccessByteWidth) <= 221 RegionLength) 222 { 223 FieldStartOffset = 224 ACPI_ROUND_DOWN (FieldByteOffset, AccessByteWidth) / 225 AccessByteWidth; 226 227 FieldEndOffset = 228 ACPI_ROUND_UP ((FieldByteLength + FieldByteOffset), 229 AccessByteWidth) / AccessByteWidth; 230 231 Accesses = FieldEndOffset - FieldStartOffset; 232 233 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 234 "AccessWidth %u end is within region\n", AccessByteWidth)); 235 236 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 237 "Field Start %u, Field End %u -- requires %u accesses\n", 238 FieldStartOffset, FieldEndOffset, Accesses)); 239 240 /* Single access is optimal */ 241 242 if (Accesses <= 1) 243 { 244 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 245 "Entire field can be accessed " 246 "with one operation of size %u\n", 247 AccessByteWidth)); 248 return_VALUE (AccessByteWidth); 249 } 250 251 /* 252 * Fits in the region, but requires more than one read/write. 253 * try the next wider access on next iteration 254 */ 255 if (Accesses < MinimumAccesses) 256 { 257 MinimumAccesses = Accesses; 258 MinimumAccessWidth = AccessByteWidth; 259 } 260 } 261 else 262 { 263 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 264 "AccessWidth %u end is NOT within region\n", 265 AccessByteWidth)); 266 if (AccessByteWidth == 1) 267 { 268 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 269 "Field goes beyond end-of-region!\n")); 270 271 /* Field does not fit in the region at all */ 272 273 return_VALUE (0); 274 } 275 276 /* 277 * This width goes beyond the end-of-region, back off to 278 * previous access 279 */ 280 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 281 "Backing off to previous optimal access width of %u\n", 282 MinimumAccessWidth)); 283 return_VALUE (MinimumAccessWidth); 284 } 285 } 286 287 /* 288 * Could not read/write field with one operation, 289 * just use max access width 290 */ 291 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 292 "Cannot access field in one operation, using width 8\n")); 293 294 return_VALUE (8); 295 } 296 #endif /* ACPI_UNDER_DEVELOPMENT */ 297 298 299 /******************************************************************************* 300 * 301 * FUNCTION: AcpiExDecodeFieldAccess 302 * 303 * PARAMETERS: ObjDesc - Field object 304 * FieldFlags - Encoded fieldflags (contains access bits) 305 * ReturnByteAlignment - Where the byte alignment is returned 306 * 307 * RETURN: Field granularity (8, 16, 32 or 64) and 308 * ByteAlignment (1, 2, 3, or 4) 309 * 310 * DESCRIPTION: Decode the AccessType bits of a field definition. 311 * 312 ******************************************************************************/ 313 314 static UINT32 315 AcpiExDecodeFieldAccess ( 316 ACPI_OPERAND_OBJECT *ObjDesc, 317 UINT8 FieldFlags, 318 UINT32 *ReturnByteAlignment) 319 { 320 UINT32 Access; 321 UINT32 ByteAlignment; 322 UINT32 BitLength; 323 324 325 ACPI_FUNCTION_TRACE (ExDecodeFieldAccess); 326 327 328 Access = (FieldFlags & AML_FIELD_ACCESS_TYPE_MASK); 329 330 switch (Access) 331 { 332 case AML_FIELD_ACCESS_ANY: 333 334 #ifdef ACPI_UNDER_DEVELOPMENT 335 ByteAlignment = 336 AcpiExGenerateAccess (ObjDesc->CommonField.StartFieldBitOffset, 337 ObjDesc->CommonField.BitLength, 338 0xFFFFFFFF /* Temp until we pass RegionLength as parameter */); 339 BitLength = ByteAlignment * 8; 340 #endif 341 342 ByteAlignment = 1; 343 BitLength = 8; 344 break; 345 346 case AML_FIELD_ACCESS_BYTE: 347 case AML_FIELD_ACCESS_BUFFER: /* ACPI 2.0 (SMBus Buffer) */ 348 349 ByteAlignment = 1; 350 BitLength = 8; 351 break; 352 353 case AML_FIELD_ACCESS_WORD: 354 355 ByteAlignment = 2; 356 BitLength = 16; 357 break; 358 359 case AML_FIELD_ACCESS_DWORD: 360 361 ByteAlignment = 4; 362 BitLength = 32; 363 break; 364 365 case AML_FIELD_ACCESS_QWORD: /* ACPI 2.0 */ 366 367 ByteAlignment = 8; 368 BitLength = 64; 369 break; 370 371 default: 372 373 /* Invalid field access type */ 374 375 ACPI_ERROR ((AE_INFO, 376 "Unknown field access type 0x%X", 377 Access)); 378 379 return_UINT32 (0); 380 } 381 382 if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD) 383 { 384 /* 385 * BufferField access can be on any byte boundary, so the 386 * ByteAlignment is always 1 byte -- regardless of any ByteAlignment 387 * implied by the field access type. 388 */ 389 ByteAlignment = 1; 390 } 391 392 *ReturnByteAlignment = ByteAlignment; 393 return_UINT32 (BitLength); 394 } 395 396 397 /******************************************************************************* 398 * 399 * FUNCTION: AcpiExPrepCommonFieldObject 400 * 401 * PARAMETERS: ObjDesc - The field object 402 * FieldFlags - Access, LockRule, and UpdateRule. 403 * The format of a FieldFlag is described 404 * in the ACPI specification 405 * FieldAttribute - Special attributes (not used) 406 * FieldBitPosition - Field start position 407 * FieldBitLength - Field length in number of bits 408 * 409 * RETURN: Status 410 * 411 * DESCRIPTION: Initialize the areas of the field object that are common 412 * to the various types of fields. Note: This is very "sensitive" 413 * code because we are solving the general case for field 414 * alignment. 415 * 416 ******************************************************************************/ 417 418 ACPI_STATUS 419 AcpiExPrepCommonFieldObject ( 420 ACPI_OPERAND_OBJECT *ObjDesc, 421 UINT8 FieldFlags, 422 UINT8 FieldAttribute, 423 UINT32 FieldBitPosition, 424 UINT32 FieldBitLength) 425 { 426 UINT32 AccessBitWidth; 427 UINT32 ByteAlignment; 428 UINT32 NearestByteAddress; 429 430 431 ACPI_FUNCTION_TRACE (ExPrepCommonFieldObject); 432 433 434 /* 435 * Note: the structure being initialized is the 436 * ACPI_COMMON_FIELD_INFO; No structure fields outside of the common 437 * area are initialized by this procedure. 438 */ 439 ObjDesc->CommonField.FieldFlags = FieldFlags; 440 ObjDesc->CommonField.Attribute = FieldAttribute; 441 ObjDesc->CommonField.BitLength = FieldBitLength; 442 443 /* 444 * Decode the access type so we can compute offsets. The access type gives 445 * two pieces of information - the width of each field access and the 446 * necessary ByteAlignment (address granularity) of the access. 447 * 448 * For AnyAcc, the AccessBitWidth is the largest width that is both 449 * necessary and possible in an attempt to access the whole field in one 450 * I/O operation. However, for AnyAcc, the ByteAlignment is always one 451 * byte. 452 * 453 * For all Buffer Fields, the ByteAlignment is always one byte. 454 * 455 * For all other access types (Byte, Word, Dword, Qword), the Bitwidth is 456 * the same (equivalent) as the ByteAlignment. 457 */ 458 AccessBitWidth = AcpiExDecodeFieldAccess ( 459 ObjDesc, FieldFlags, &ByteAlignment); 460 if (!AccessBitWidth) 461 { 462 return_ACPI_STATUS (AE_AML_OPERAND_VALUE); 463 } 464 465 /* Setup width (access granularity) fields (values are: 1, 2, 4, 8) */ 466 467 ObjDesc->CommonField.AccessByteWidth = (UINT8) 468 ACPI_DIV_8 (AccessBitWidth); 469 470 /* 471 * BaseByteOffset is the address of the start of the field within the 472 * region. It is the byte address of the first *datum* (field-width data 473 * unit) of the field. (i.e., the first datum that contains at least the 474 * first *bit* of the field.) 475 * 476 * Note: ByteAlignment is always either equal to the AccessBitWidth or 8 477 * (Byte access), and it defines the addressing granularity of the parent 478 * region or buffer. 479 */ 480 NearestByteAddress = 481 ACPI_ROUND_BITS_DOWN_TO_BYTES (FieldBitPosition); 482 ObjDesc->CommonField.BaseByteOffset = (UINT32) 483 ACPI_ROUND_DOWN (NearestByteAddress, ByteAlignment); 484 485 /* 486 * StartFieldBitOffset is the offset of the first bit of the field within 487 * a field datum. 488 */ 489 ObjDesc->CommonField.StartFieldBitOffset = (UINT8) 490 (FieldBitPosition - ACPI_MUL_8 (ObjDesc->CommonField.BaseByteOffset)); 491 492 return_ACPI_STATUS (AE_OK); 493 } 494 495 496 /******************************************************************************* 497 * 498 * FUNCTION: AcpiExPrepFieldValue 499 * 500 * PARAMETERS: Info - Contains all field creation info 501 * 502 * RETURN: Status 503 * 504 * DESCRIPTION: Construct an object of type ACPI_OPERAND_OBJECT with a 505 * subtype of DefField and connect it to the parent Node. 506 * 507 ******************************************************************************/ 508 509 ACPI_STATUS 510 AcpiExPrepFieldValue ( 511 ACPI_CREATE_FIELD_INFO *Info) 512 { 513 ACPI_OPERAND_OBJECT *ObjDesc; 514 ACPI_OPERAND_OBJECT *SecondDesc = NULL; 515 ACPI_STATUS Status; 516 UINT32 AccessByteWidth; 517 UINT32 Type; 518 519 520 ACPI_FUNCTION_TRACE (ExPrepFieldValue); 521 522 523 /* Parameter validation */ 524 525 if (Info->FieldType != ACPI_TYPE_LOCAL_INDEX_FIELD) 526 { 527 if (!Info->RegionNode) 528 { 529 ACPI_ERROR ((AE_INFO, "Null RegionNode")); 530 return_ACPI_STATUS (AE_AML_NO_OPERAND); 531 } 532 533 Type = AcpiNsGetType (Info->RegionNode); 534 if (Type != ACPI_TYPE_REGION) 535 { 536 ACPI_ERROR ((AE_INFO, "Needed Region, found type 0x%X (%s)", 537 Type, AcpiUtGetTypeName (Type))); 538 539 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 540 } 541 } 542 543 /* Allocate a new field object */ 544 545 ObjDesc = AcpiUtCreateInternalObject (Info->FieldType); 546 if (!ObjDesc) 547 { 548 return_ACPI_STATUS (AE_NO_MEMORY); 549 } 550 551 /* Initialize areas of the object that are common to all fields */ 552 553 ObjDesc->CommonField.Node = Info->FieldNode; 554 Status = AcpiExPrepCommonFieldObject (ObjDesc, 555 Info->FieldFlags, Info->Attribute, 556 Info->FieldBitPosition, Info->FieldBitLength); 557 if (ACPI_FAILURE (Status)) 558 { 559 AcpiUtDeleteObjectDesc (ObjDesc); 560 return_ACPI_STATUS (Status); 561 } 562 563 /* Initialize areas of the object that are specific to the field type */ 564 565 switch (Info->FieldType) 566 { 567 case ACPI_TYPE_LOCAL_REGION_FIELD: 568 569 ObjDesc->Field.RegionObj = AcpiNsGetAttachedObject (Info->RegionNode); 570 571 /* Fields specific to GenericSerialBus fields */ 572 573 ObjDesc->Field.AccessLength = Info->AccessLength; 574 575 if (Info->ConnectionNode) 576 { 577 SecondDesc = Info->ConnectionNode->Object; 578 if (!(SecondDesc->Common.Flags & AOPOBJ_DATA_VALID)) 579 { 580 Status = AcpiDsGetBufferArguments (SecondDesc); 581 if (ACPI_FAILURE (Status)) 582 { 583 AcpiUtDeleteObjectDesc (ObjDesc); 584 return_ACPI_STATUS (Status); 585 } 586 } 587 588 ObjDesc->Field.ResourceBuffer = 589 SecondDesc->Buffer.Pointer; 590 ObjDesc->Field.ResourceLength = 591 (UINT16) SecondDesc->Buffer.Length; 592 } 593 else if (Info->ResourceBuffer) 594 { 595 ObjDesc->Field.ResourceBuffer = Info->ResourceBuffer; 596 ObjDesc->Field.ResourceLength = Info->ResourceLength; 597 } 598 599 ObjDesc->Field.PinNumberIndex = Info->PinNumberIndex; 600 601 /* Allow full data read from EC address space */ 602 603 if ((ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_EC) && 604 (ObjDesc->CommonField.BitLength > 8)) 605 { 606 AccessByteWidth = ACPI_ROUND_BITS_UP_TO_BYTES ( 607 ObjDesc->CommonField.BitLength); 608 609 /* Maximum byte width supported is 255 */ 610 611 if (AccessByteWidth < 256) 612 { 613 ObjDesc->CommonField.AccessByteWidth = 614 (UINT8) AccessByteWidth; 615 } 616 } 617 618 /* An additional reference for the container */ 619 620 AcpiUtAddReference (ObjDesc->Field.RegionObj); 621 622 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 623 "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n", 624 ObjDesc->Field.StartFieldBitOffset, 625 ObjDesc->Field.BaseByteOffset, 626 ObjDesc->Field.AccessByteWidth, 627 ObjDesc->Field.RegionObj)); 628 break; 629 630 case ACPI_TYPE_LOCAL_BANK_FIELD: 631 632 ObjDesc->BankField.Value = Info->BankValue; 633 ObjDesc->BankField.RegionObj = 634 AcpiNsGetAttachedObject (Info->RegionNode); 635 ObjDesc->BankField.BankObj = 636 AcpiNsGetAttachedObject (Info->RegisterNode); 637 638 /* An additional reference for the attached objects */ 639 640 AcpiUtAddReference (ObjDesc->BankField.RegionObj); 641 AcpiUtAddReference (ObjDesc->BankField.BankObj); 642 643 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 644 "Bank Field: BitOff %X, Off %X, Gran %X, Region %p, BankReg %p\n", 645 ObjDesc->BankField.StartFieldBitOffset, 646 ObjDesc->BankField.BaseByteOffset, 647 ObjDesc->Field.AccessByteWidth, 648 ObjDesc->BankField.RegionObj, 649 ObjDesc->BankField.BankObj)); 650 651 /* 652 * Remember location in AML stream of the field unit 653 * opcode and operands -- since the BankValue 654 * operands must be evaluated. 655 */ 656 SecondDesc = ObjDesc->Common.NextObject; 657 SecondDesc->Extra.AmlStart = ACPI_CAST_PTR (ACPI_PARSE_OBJECT, 658 Info->DataRegisterNode)->Named.Data; 659 SecondDesc->Extra.AmlLength = ACPI_CAST_PTR (ACPI_PARSE_OBJECT, 660 Info->DataRegisterNode)->Named.Length; 661 662 break; 663 664 case ACPI_TYPE_LOCAL_INDEX_FIELD: 665 666 /* Get the Index and Data registers */ 667 668 ObjDesc->IndexField.IndexObj = 669 AcpiNsGetAttachedObject (Info->RegisterNode); 670 ObjDesc->IndexField.DataObj = 671 AcpiNsGetAttachedObject (Info->DataRegisterNode); 672 673 if (!ObjDesc->IndexField.DataObj || !ObjDesc->IndexField.IndexObj) 674 { 675 ACPI_ERROR ((AE_INFO, "Null Index Object during field prep")); 676 AcpiUtDeleteObjectDesc (ObjDesc); 677 return_ACPI_STATUS (AE_AML_INTERNAL); 678 } 679 680 /* An additional reference for the attached objects */ 681 682 AcpiUtAddReference (ObjDesc->IndexField.DataObj); 683 AcpiUtAddReference (ObjDesc->IndexField.IndexObj); 684 685 /* 686 * April 2006: Changed to match MS behavior 687 * 688 * The value written to the Index register is the byte offset of the 689 * target field in units of the granularity of the IndexField 690 * 691 * Previously, the value was calculated as an index in terms of the 692 * width of the Data register, as below: 693 * 694 * ObjDesc->IndexField.Value = (UINT32) 695 * (Info->FieldBitPosition / ACPI_MUL_8 ( 696 * ObjDesc->Field.AccessByteWidth)); 697 * 698 * February 2006: Tried value as a byte offset: 699 * ObjDesc->IndexField.Value = (UINT32) 700 * ACPI_DIV_8 (Info->FieldBitPosition); 701 */ 702 ObjDesc->IndexField.Value = (UINT32) ACPI_ROUND_DOWN ( 703 ACPI_DIV_8 (Info->FieldBitPosition), 704 ObjDesc->IndexField.AccessByteWidth); 705 706 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 707 "IndexField: BitOff %X, Off %X, Value %X, " 708 "Gran %X, Index %p, Data %p\n", 709 ObjDesc->IndexField.StartFieldBitOffset, 710 ObjDesc->IndexField.BaseByteOffset, 711 ObjDesc->IndexField.Value, 712 ObjDesc->Field.AccessByteWidth, 713 ObjDesc->IndexField.IndexObj, 714 ObjDesc->IndexField.DataObj)); 715 break; 716 717 default: 718 719 /* No other types should get here */ 720 721 break; 722 } 723 724 /* 725 * Store the constructed descriptor (ObjDesc) into the parent Node, 726 * preserving the current type of that NamedObj. 727 */ 728 Status = AcpiNsAttachObject ( 729 Info->FieldNode, ObjDesc, AcpiNsGetType (Info->FieldNode)); 730 731 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, 732 "Set NamedObj %p [%4.4s], ObjDesc %p\n", 733 Info->FieldNode, AcpiUtGetNodeName (Info->FieldNode), ObjDesc)); 734 735 /* Remove local reference to the object */ 736 737 AcpiUtRemoveReference (ObjDesc); 738 return_ACPI_STATUS (Status); 739 } 740