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 - 2023, 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 * Alternatively, you may choose to be licensed under the terms of the
117 * following license:
118 *
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
121 * are met:
122 * 1. Redistributions of source code must retain the above copyright
123 * notice, this list of conditions, and the following disclaimer,
124 * without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 * substantially similar to the "NO WARRANTY" disclaimer below
127 * ("Disclaimer") and any redistribution must be conditioned upon
128 * including a substantially similar Disclaimer requirement for further
129 * binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 * of any contributors may be used to endorse or promote products derived
132 * from this software without specific prior written permission.
133 *
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
145 *
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
149 *
150 *****************************************************************************/
151
152 #include "acpi.h"
153 #include "accommon.h"
154 #include "acinterp.h"
155 #include "amlcode.h"
156 #include "acnamesp.h"
157 #include "acdispat.h"
158
159
160 #define _COMPONENT ACPI_EXECUTER
161 ACPI_MODULE_NAME ("exprep")
162
163 /* Local prototypes */
164
165 static UINT32
166 AcpiExDecodeFieldAccess (
167 ACPI_OPERAND_OBJECT *ObjDesc,
168 UINT8 FieldFlags,
169 UINT32 *ReturnByteAlignment);
170
171
172 #ifdef ACPI_UNDER_DEVELOPMENT
173
174 static UINT32
175 AcpiExGenerateAccess (
176 UINT32 FieldBitOffset,
177 UINT32 FieldBitLength,
178 UINT32 RegionLength);
179
180
181 /*******************************************************************************
182 *
183 * FUNCTION: AcpiExGenerateAccess
184 *
185 * PARAMETERS: FieldBitOffset - Start of field within parent region/buffer
186 * FieldBitLength - Length of field in bits
187 * RegionLength - Length of parent in bytes
188 *
189 * RETURN: Field granularity (8, 16, 32 or 64) and
190 * ByteAlignment (1, 2, 3, or 4)
191 *
192 * DESCRIPTION: Generate an optimal access width for fields defined with the
193 * AnyAcc keyword.
194 *
195 * NOTE: Need to have the RegionLength in order to check for boundary
196 * conditions (end-of-region). However, the RegionLength is a deferred
197 * operation. Therefore, to complete this implementation, the generation
198 * of this access width must be deferred until the region length has
199 * been evaluated.
200 *
201 ******************************************************************************/
202
203 static UINT32
AcpiExGenerateAccess(UINT32 FieldBitOffset,UINT32 FieldBitLength,UINT32 RegionLength)204 AcpiExGenerateAccess (
205 UINT32 FieldBitOffset,
206 UINT32 FieldBitLength,
207 UINT32 RegionLength)
208 {
209 UINT32 FieldByteLength;
210 UINT32 FieldByteOffset;
211 UINT32 FieldByteEndOffset;
212 UINT32 AccessByteWidth;
213 UINT32 FieldStartOffset;
214 UINT32 FieldEndOffset;
215 UINT32 MinimumAccessWidth = 0xFFFFFFFF;
216 UINT32 MinimumAccesses = 0xFFFFFFFF;
217 UINT32 Accesses;
218
219
220 ACPI_FUNCTION_TRACE (ExGenerateAccess);
221
222
223 /* Round Field start offset and length to "minimal" byte boundaries */
224
225 FieldByteOffset = ACPI_DIV_8 (
226 ACPI_ROUND_DOWN (FieldBitOffset, 8));
227
228 FieldByteEndOffset = ACPI_DIV_8 (
229 ACPI_ROUND_UP (FieldBitLength + FieldBitOffset, 8));
230
231 FieldByteLength = FieldByteEndOffset - FieldByteOffset;
232
233 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
234 "Bit length %u, Bit offset %u\n",
235 FieldBitLength, FieldBitOffset));
236
237 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
238 "Byte Length %u, Byte Offset %u, End Offset %u\n",
239 FieldByteLength, FieldByteOffset, FieldByteEndOffset));
240
241 /*
242 * Iterative search for the maximum access width that is both aligned
243 * and does not go beyond the end of the region
244 *
245 * Start at ByteAcc and work upwards to QwordAcc max. (1,2,4,8 bytes)
246 */
247 for (AccessByteWidth = 1; AccessByteWidth <= 8; AccessByteWidth <<= 1)
248 {
249 /*
250 * 1) Round end offset up to next access boundary and make sure that
251 * this does not go beyond the end of the parent region.
252 * 2) When the Access width is greater than the FieldByteLength, we
253 * are done. (This does not optimize for the perfectly aligned
254 * case yet).
255 */
256 if (ACPI_ROUND_UP (FieldByteEndOffset, AccessByteWidth) <=
257 RegionLength)
258 {
259 FieldStartOffset =
260 ACPI_ROUND_DOWN (FieldByteOffset, AccessByteWidth) /
261 AccessByteWidth;
262
263 FieldEndOffset =
264 ACPI_ROUND_UP ((FieldByteLength + FieldByteOffset),
265 AccessByteWidth) / AccessByteWidth;
266
267 Accesses = FieldEndOffset - FieldStartOffset;
268
269 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
270 "AccessWidth %u end is within region\n", AccessByteWidth));
271
272 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
273 "Field Start %u, Field End %u -- requires %u accesses\n",
274 FieldStartOffset, FieldEndOffset, Accesses));
275
276 /* Single access is optimal */
277
278 if (Accesses <= 1)
279 {
280 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
281 "Entire field can be accessed "
282 "with one operation of size %u\n",
283 AccessByteWidth));
284 return_VALUE (AccessByteWidth);
285 }
286
287 /*
288 * Fits in the region, but requires more than one read/write.
289 * try the next wider access on next iteration
290 */
291 if (Accesses < MinimumAccesses)
292 {
293 MinimumAccesses = Accesses;
294 MinimumAccessWidth = AccessByteWidth;
295 }
296 }
297 else
298 {
299 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
300 "AccessWidth %u end is NOT within region\n",
301 AccessByteWidth));
302 if (AccessByteWidth == 1)
303 {
304 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
305 "Field goes beyond end-of-region!\n"));
306
307 /* Field does not fit in the region at all */
308
309 return_VALUE (0);
310 }
311
312 /*
313 * This width goes beyond the end-of-region, back off to
314 * previous access
315 */
316 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
317 "Backing off to previous optimal access width of %u\n",
318 MinimumAccessWidth));
319 return_VALUE (MinimumAccessWidth);
320 }
321 }
322
323 /*
324 * Could not read/write field with one operation,
325 * just use max access width
326 */
327 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
328 "Cannot access field in one operation, using width 8\n"));
329
330 return_VALUE (8);
331 }
332 #endif /* ACPI_UNDER_DEVELOPMENT */
333
334
335 /*******************************************************************************
336 *
337 * FUNCTION: AcpiExDecodeFieldAccess
338 *
339 * PARAMETERS: ObjDesc - Field object
340 * FieldFlags - Encoded fieldflags (contains access bits)
341 * ReturnByteAlignment - Where the byte alignment is returned
342 *
343 * RETURN: Field granularity (8, 16, 32 or 64) and
344 * ByteAlignment (1, 2, 3, or 4)
345 *
346 * DESCRIPTION: Decode the AccessType bits of a field definition.
347 *
348 ******************************************************************************/
349
350 static UINT32
AcpiExDecodeFieldAccess(ACPI_OPERAND_OBJECT * ObjDesc,UINT8 FieldFlags,UINT32 * ReturnByteAlignment)351 AcpiExDecodeFieldAccess (
352 ACPI_OPERAND_OBJECT *ObjDesc,
353 UINT8 FieldFlags,
354 UINT32 *ReturnByteAlignment)
355 {
356 UINT32 Access;
357 UINT32 ByteAlignment;
358 UINT32 BitLength;
359
360
361 ACPI_FUNCTION_TRACE (ExDecodeFieldAccess);
362
363
364 Access = (FieldFlags & AML_FIELD_ACCESS_TYPE_MASK);
365
366 switch (Access)
367 {
368 case AML_FIELD_ACCESS_ANY:
369
370 #ifdef ACPI_UNDER_DEVELOPMENT
371 ByteAlignment =
372 AcpiExGenerateAccess (ObjDesc->CommonField.StartFieldBitOffset,
373 ObjDesc->CommonField.BitLength,
374 0xFFFFFFFF /* Temp until we pass RegionLength as parameter */);
375 BitLength = ByteAlignment * 8;
376 #endif
377
378 ByteAlignment = 1;
379 BitLength = 8;
380 break;
381
382 case AML_FIELD_ACCESS_BYTE:
383 case AML_FIELD_ACCESS_BUFFER: /* ACPI 2.0 (SMBus Buffer) */
384
385 ByteAlignment = 1;
386 BitLength = 8;
387 break;
388
389 case AML_FIELD_ACCESS_WORD:
390
391 ByteAlignment = 2;
392 BitLength = 16;
393 break;
394
395 case AML_FIELD_ACCESS_DWORD:
396
397 ByteAlignment = 4;
398 BitLength = 32;
399 break;
400
401 case AML_FIELD_ACCESS_QWORD: /* ACPI 2.0 */
402
403 ByteAlignment = 8;
404 BitLength = 64;
405 break;
406
407 default:
408
409 /* Invalid field access type */
410
411 ACPI_ERROR ((AE_INFO,
412 "Unknown field access type 0x%X",
413 Access));
414
415 return_UINT32 (0);
416 }
417
418 if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
419 {
420 /*
421 * BufferField access can be on any byte boundary, so the
422 * ByteAlignment is always 1 byte -- regardless of any ByteAlignment
423 * implied by the field access type.
424 */
425 ByteAlignment = 1;
426 }
427
428 *ReturnByteAlignment = ByteAlignment;
429 return_UINT32 (BitLength);
430 }
431
432
433 /*******************************************************************************
434 *
435 * FUNCTION: AcpiExPrepCommonFieldObject
436 *
437 * PARAMETERS: ObjDesc - The field object
438 * FieldFlags - Access, LockRule, and UpdateRule.
439 * The format of a FieldFlag is described
440 * in the ACPI specification
441 * FieldAttribute - Special attributes (not used)
442 * FieldBitPosition - Field start position
443 * FieldBitLength - Field length in number of bits
444 *
445 * RETURN: Status
446 *
447 * DESCRIPTION: Initialize the areas of the field object that are common
448 * to the various types of fields. Note: This is very "sensitive"
449 * code because we are solving the general case for field
450 * alignment.
451 *
452 ******************************************************************************/
453
454 ACPI_STATUS
AcpiExPrepCommonFieldObject(ACPI_OPERAND_OBJECT * ObjDesc,UINT8 FieldFlags,UINT8 FieldAttribute,UINT32 FieldBitPosition,UINT32 FieldBitLength)455 AcpiExPrepCommonFieldObject (
456 ACPI_OPERAND_OBJECT *ObjDesc,
457 UINT8 FieldFlags,
458 UINT8 FieldAttribute,
459 UINT32 FieldBitPosition,
460 UINT32 FieldBitLength)
461 {
462 UINT32 AccessBitWidth;
463 UINT32 ByteAlignment;
464 UINT32 NearestByteAddress;
465
466
467 ACPI_FUNCTION_TRACE (ExPrepCommonFieldObject);
468
469
470 /*
471 * Note: the structure being initialized is the
472 * ACPI_COMMON_FIELD_INFO; No structure fields outside of the common
473 * area are initialized by this procedure.
474 */
475 ObjDesc->CommonField.FieldFlags = FieldFlags;
476 ObjDesc->CommonField.Attribute = FieldAttribute;
477 ObjDesc->CommonField.BitLength = FieldBitLength;
478
479 /*
480 * Decode the access type so we can compute offsets. The access type gives
481 * two pieces of information - the width of each field access and the
482 * necessary ByteAlignment (address granularity) of the access.
483 *
484 * For AnyAcc, the AccessBitWidth is the largest width that is both
485 * necessary and possible in an attempt to access the whole field in one
486 * I/O operation. However, for AnyAcc, the ByteAlignment is always one
487 * byte.
488 *
489 * For all Buffer Fields, the ByteAlignment is always one byte.
490 *
491 * For all other access types (Byte, Word, Dword, Qword), the Bitwidth is
492 * the same (equivalent) as the ByteAlignment.
493 */
494 AccessBitWidth = AcpiExDecodeFieldAccess (
495 ObjDesc, FieldFlags, &ByteAlignment);
496 if (!AccessBitWidth)
497 {
498 return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
499 }
500
501 /* Setup width (access granularity) fields (values are: 1, 2, 4, 8) */
502
503 ObjDesc->CommonField.AccessByteWidth = (UINT8)
504 ACPI_DIV_8 (AccessBitWidth);
505
506 /*
507 * BaseByteOffset is the address of the start of the field within the
508 * region. It is the byte address of the first *datum* (field-width data
509 * unit) of the field. (i.e., the first datum that contains at least the
510 * first *bit* of the field.)
511 *
512 * Note: ByteAlignment is always either equal to the AccessBitWidth or 8
513 * (Byte access), and it defines the addressing granularity of the parent
514 * region or buffer.
515 */
516 NearestByteAddress =
517 ACPI_ROUND_BITS_DOWN_TO_BYTES (FieldBitPosition);
518 ObjDesc->CommonField.BaseByteOffset = (UINT32)
519 ACPI_ROUND_DOWN (NearestByteAddress, ByteAlignment);
520
521 /*
522 * StartFieldBitOffset is the offset of the first bit of the field within
523 * a field datum.
524 */
525 ObjDesc->CommonField.StartFieldBitOffset = (UINT8)
526 (FieldBitPosition - ACPI_MUL_8 (ObjDesc->CommonField.BaseByteOffset));
527
528 return_ACPI_STATUS (AE_OK);
529 }
530
531
532 /*******************************************************************************
533 *
534 * FUNCTION: AcpiExPrepFieldValue
535 *
536 * PARAMETERS: Info - Contains all field creation info
537 *
538 * RETURN: Status
539 *
540 * DESCRIPTION: Construct an object of type ACPI_OPERAND_OBJECT with a
541 * subtype of DefField and connect it to the parent Node.
542 *
543 ******************************************************************************/
544
545 ACPI_STATUS
AcpiExPrepFieldValue(ACPI_CREATE_FIELD_INFO * Info)546 AcpiExPrepFieldValue (
547 ACPI_CREATE_FIELD_INFO *Info)
548 {
549 ACPI_OPERAND_OBJECT *ObjDesc;
550 ACPI_OPERAND_OBJECT *SecondDesc = NULL;
551 ACPI_STATUS Status;
552 UINT32 AccessByteWidth;
553 UINT32 Type;
554
555
556 ACPI_FUNCTION_TRACE (ExPrepFieldValue);
557
558
559 /* Parameter validation */
560
561 if (Info->FieldType != ACPI_TYPE_LOCAL_INDEX_FIELD)
562 {
563 if (!Info->RegionNode)
564 {
565 ACPI_ERROR ((AE_INFO, "Null RegionNode"));
566 return_ACPI_STATUS (AE_AML_NO_OPERAND);
567 }
568
569 Type = AcpiNsGetType (Info->RegionNode);
570 if (Type != ACPI_TYPE_REGION)
571 {
572 ACPI_ERROR ((AE_INFO, "Needed Region, found type 0x%X (%s)",
573 Type, AcpiUtGetTypeName (Type)));
574
575 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
576 }
577 }
578
579 /* Allocate a new field object */
580
581 ObjDesc = AcpiUtCreateInternalObject (Info->FieldType);
582 if (!ObjDesc)
583 {
584 return_ACPI_STATUS (AE_NO_MEMORY);
585 }
586
587 /* Initialize areas of the object that are common to all fields */
588
589 ObjDesc->CommonField.Node = Info->FieldNode;
590 Status = AcpiExPrepCommonFieldObject (ObjDesc,
591 Info->FieldFlags, Info->Attribute,
592 Info->FieldBitPosition, Info->FieldBitLength);
593 if (ACPI_FAILURE (Status))
594 {
595 AcpiUtDeleteObjectDesc (ObjDesc);
596 return_ACPI_STATUS (Status);
597 }
598
599 /* Initialize areas of the object that are specific to the field type */
600
601 switch (Info->FieldType)
602 {
603 case ACPI_TYPE_LOCAL_REGION_FIELD:
604
605 ObjDesc->Field.RegionObj = AcpiNsGetAttachedObject (Info->RegionNode);
606
607 /* Fields specific to GenericSerialBus fields */
608
609 ObjDesc->Field.AccessLength = Info->AccessLength;
610
611 if (Info->ConnectionNode)
612 {
613 SecondDesc = Info->ConnectionNode->Object;
614 if (!(SecondDesc->Common.Flags & AOPOBJ_DATA_VALID))
615 {
616 Status = AcpiDsGetBufferArguments (SecondDesc);
617 if (ACPI_FAILURE (Status))
618 {
619 AcpiUtDeleteObjectDesc (ObjDesc);
620 return_ACPI_STATUS (Status);
621 }
622 }
623
624 ObjDesc->Field.ResourceBuffer =
625 SecondDesc->Buffer.Pointer;
626 ObjDesc->Field.ResourceLength =
627 (UINT16) SecondDesc->Buffer.Length;
628 }
629 else if (Info->ResourceBuffer)
630 {
631 ObjDesc->Field.ResourceBuffer = Info->ResourceBuffer;
632 ObjDesc->Field.ResourceLength = Info->ResourceLength;
633 }
634
635 ObjDesc->Field.PinNumberIndex = Info->PinNumberIndex;
636
637 /* Allow full data read from EC address space */
638
639 if ((ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_EC) &&
640 (ObjDesc->CommonField.BitLength > 8))
641 {
642 AccessByteWidth = ACPI_ROUND_BITS_UP_TO_BYTES (
643 ObjDesc->CommonField.BitLength);
644
645 /* Maximum byte width supported is 255 */
646
647 if (AccessByteWidth < 256)
648 {
649 ObjDesc->CommonField.AccessByteWidth =
650 (UINT8) AccessByteWidth;
651 }
652 }
653
654 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
655 "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n",
656 ObjDesc->Field.StartFieldBitOffset,
657 ObjDesc->Field.BaseByteOffset,
658 ObjDesc->Field.AccessByteWidth,
659 ObjDesc->Field.RegionObj));
660 break;
661
662 case ACPI_TYPE_LOCAL_BANK_FIELD:
663
664 ObjDesc->BankField.Value = Info->BankValue;
665 ObjDesc->BankField.RegionObj =
666 AcpiNsGetAttachedObject (Info->RegionNode);
667 ObjDesc->BankField.BankObj =
668 AcpiNsGetAttachedObject (Info->RegisterNode);
669
670 /* An additional reference for the attached objects */
671
672 AcpiUtAddReference (ObjDesc->BankField.RegionObj);
673 AcpiUtAddReference (ObjDesc->BankField.BankObj);
674
675 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
676 "Bank Field: BitOff %X, Off %X, Gran %X, Region %p, BankReg %p\n",
677 ObjDesc->BankField.StartFieldBitOffset,
678 ObjDesc->BankField.BaseByteOffset,
679 ObjDesc->Field.AccessByteWidth,
680 ObjDesc->BankField.RegionObj,
681 ObjDesc->BankField.BankObj));
682
683 /*
684 * Remember location in AML stream of the field unit
685 * opcode and operands -- since the BankValue
686 * operands must be evaluated.
687 */
688 SecondDesc = ObjDesc->Common.NextObject;
689 SecondDesc->Extra.AmlStart = ACPI_CAST_PTR (ACPI_PARSE_OBJECT,
690 Info->DataRegisterNode)->Named.Data;
691 SecondDesc->Extra.AmlLength = ACPI_CAST_PTR (ACPI_PARSE_OBJECT,
692 Info->DataRegisterNode)->Named.Length;
693
694 break;
695
696 case ACPI_TYPE_LOCAL_INDEX_FIELD:
697
698 /* Get the Index and Data registers */
699
700 ObjDesc->IndexField.IndexObj =
701 AcpiNsGetAttachedObject (Info->RegisterNode);
702 ObjDesc->IndexField.DataObj =
703 AcpiNsGetAttachedObject (Info->DataRegisterNode);
704
705 if (!ObjDesc->IndexField.DataObj || !ObjDesc->IndexField.IndexObj)
706 {
707 ACPI_ERROR ((AE_INFO, "Null Index Object during field prep"));
708 AcpiUtDeleteObjectDesc (ObjDesc);
709 return_ACPI_STATUS (AE_AML_INTERNAL);
710 }
711
712 /* An additional reference for the attached objects */
713
714 AcpiUtAddReference (ObjDesc->IndexField.DataObj);
715 AcpiUtAddReference (ObjDesc->IndexField.IndexObj);
716
717 /*
718 * April 2006: Changed to match MS behavior
719 *
720 * The value written to the Index register is the byte offset of the
721 * target field in units of the granularity of the IndexField
722 *
723 * Previously, the value was calculated as an index in terms of the
724 * width of the Data register, as below:
725 *
726 * ObjDesc->IndexField.Value = (UINT32)
727 * (Info->FieldBitPosition / ACPI_MUL_8 (
728 * ObjDesc->Field.AccessByteWidth));
729 *
730 * February 2006: Tried value as a byte offset:
731 * ObjDesc->IndexField.Value = (UINT32)
732 * ACPI_DIV_8 (Info->FieldBitPosition);
733 */
734 ObjDesc->IndexField.Value = (UINT32) ACPI_ROUND_DOWN (
735 ACPI_DIV_8 (Info->FieldBitPosition),
736 ObjDesc->IndexField.AccessByteWidth);
737
738 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
739 "IndexField: BitOff %X, Off %X, Value %X, "
740 "Gran %X, Index %p, Data %p\n",
741 ObjDesc->IndexField.StartFieldBitOffset,
742 ObjDesc->IndexField.BaseByteOffset,
743 ObjDesc->IndexField.Value,
744 ObjDesc->Field.AccessByteWidth,
745 ObjDesc->IndexField.IndexObj,
746 ObjDesc->IndexField.DataObj));
747 break;
748
749 default:
750
751 /* No other types should get here */
752
753 break;
754 }
755
756 /*
757 * Store the constructed descriptor (ObjDesc) into the parent Node,
758 * preserving the current type of that NamedObj.
759 */
760 Status = AcpiNsAttachObject (
761 Info->FieldNode, ObjDesc, AcpiNsGetType (Info->FieldNode));
762
763 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
764 "Set NamedObj %p [%4.4s], ObjDesc %p\n",
765 Info->FieldNode, AcpiUtGetNodeName (Info->FieldNode), ObjDesc));
766
767 /* Remove local reference to the object */
768
769 AcpiUtRemoveReference (ObjDesc);
770 return_ACPI_STATUS (Status);
771 }
772
