1 /******************************************************************************
3 * Module Name: exprep - ACPI AML (p-code) execution - field prep utilities
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2012, Intel Corp.
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54 #define _COMPONENT ACPI_EXECUTER
55 ACPI_MODULE_NAME ("exprep")
57 /* Local prototypes */
60 AcpiExDecodeFieldAccess (
61 ACPI_OPERAND_OBJECT *ObjDesc,
63 UINT32 *ReturnByteAlignment);
66 #ifdef ACPI_UNDER_DEVELOPMENT
69 AcpiExGenerateAccess (
70 UINT32 FieldBitOffset,
71 UINT32 FieldBitLength,
74 /*******************************************************************************
76 * FUNCTION: AcpiExGenerateAccess
78 * PARAMETERS: FieldBitOffset - Start of field within parent region/buffer
79 * FieldBitLength - Length of field in bits
80 * RegionLength - Length of parent in bytes
82 * RETURN: Field granularity (8, 16, 32 or 64) and
83 * ByteAlignment (1, 2, 3, or 4)
85 * DESCRIPTION: Generate an optimal access width for fields defined with the
88 * NOTE: Need to have the RegionLength in order to check for boundary
89 * conditions (end-of-region). However, the RegionLength is a deferred
90 * operation. Therefore, to complete this implementation, the generation
91 * of this access width must be deferred until the region length has
94 ******************************************************************************/
97 AcpiExGenerateAccess (
98 UINT32 FieldBitOffset,
99 UINT32 FieldBitLength,
102 UINT32 FieldByteLength;
103 UINT32 FieldByteOffset;
104 UINT32 FieldByteEndOffset;
105 UINT32 AccessByteWidth;
106 UINT32 FieldStartOffset;
107 UINT32 FieldEndOffset;
108 UINT32 MinimumAccessWidth = 0xFFFFFFFF;
109 UINT32 MinimumAccesses = 0xFFFFFFFF;
113 ACPI_FUNCTION_TRACE (ExGenerateAccess);
116 /* Round Field start offset and length to "minimal" byte boundaries */
118 FieldByteOffset = ACPI_DIV_8 (ACPI_ROUND_DOWN (FieldBitOffset, 8));
119 FieldByteEndOffset = ACPI_DIV_8 (ACPI_ROUND_UP (FieldBitLength +
121 FieldByteLength = FieldByteEndOffset - FieldByteOffset;
123 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
124 "Bit length %u, Bit offset %u\n",
125 FieldBitLength, FieldBitOffset));
127 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
128 "Byte Length %u, Byte Offset %u, End Offset %u\n",
129 FieldByteLength, FieldByteOffset, FieldByteEndOffset));
132 * Iterative search for the maximum access width that is both aligned
133 * and does not go beyond the end of the region
135 * Start at ByteAcc and work upwards to QwordAcc max. (1,2,4,8 bytes)
137 for (AccessByteWidth = 1; AccessByteWidth <= 8; AccessByteWidth <<= 1)
140 * 1) Round end offset up to next access boundary and make sure that
141 * this does not go beyond the end of the parent region.
142 * 2) When the Access width is greater than the FieldByteLength, we
143 * are done. (This does not optimize for the perfectly aligned
146 if (ACPI_ROUND_UP (FieldByteEndOffset, AccessByteWidth) <= RegionLength)
149 ACPI_ROUND_DOWN (FieldByteOffset, AccessByteWidth) /
153 ACPI_ROUND_UP ((FieldByteLength + FieldByteOffset),
154 AccessByteWidth) / AccessByteWidth;
156 Accesses = FieldEndOffset - FieldStartOffset;
158 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
159 "AccessWidth %u end is within region\n", AccessByteWidth));
161 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
162 "Field Start %u, Field End %u -- requires %u accesses\n",
163 FieldStartOffset, FieldEndOffset, Accesses));
165 /* Single access is optimal */
169 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
170 "Entire field can be accessed with one operation of size %u\n",
172 return_VALUE (AccessByteWidth);
176 * Fits in the region, but requires more than one read/write.
177 * try the next wider access on next iteration
179 if (Accesses < MinimumAccesses)
181 MinimumAccesses = Accesses;
182 MinimumAccessWidth = AccessByteWidth;
187 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
188 "AccessWidth %u end is NOT within region\n", AccessByteWidth));
189 if (AccessByteWidth == 1)
191 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
192 "Field goes beyond end-of-region!\n"));
194 /* Field does not fit in the region at all */
200 * This width goes beyond the end-of-region, back off to
203 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
204 "Backing off to previous optimal access width of %u\n",
205 MinimumAccessWidth));
206 return_VALUE (MinimumAccessWidth);
211 * Could not read/write field with one operation,
212 * just use max access width
214 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
215 "Cannot access field in one operation, using width 8\n"));
218 #endif /* ACPI_UNDER_DEVELOPMENT */
221 /*******************************************************************************
223 * FUNCTION: AcpiExDecodeFieldAccess
225 * PARAMETERS: ObjDesc - Field object
226 * FieldFlags - Encoded fieldflags (contains access bits)
227 * ReturnByteAlignment - Where the byte alignment is returned
229 * RETURN: Field granularity (8, 16, 32 or 64) and
230 * ByteAlignment (1, 2, 3, or 4)
232 * DESCRIPTION: Decode the AccessType bits of a field definition.
234 ******************************************************************************/
237 AcpiExDecodeFieldAccess (
238 ACPI_OPERAND_OBJECT *ObjDesc,
240 UINT32 *ReturnByteAlignment)
243 UINT32 ByteAlignment;
247 ACPI_FUNCTION_TRACE (ExDecodeFieldAccess);
250 Access = (FieldFlags & AML_FIELD_ACCESS_TYPE_MASK);
254 case AML_FIELD_ACCESS_ANY:
256 #ifdef ACPI_UNDER_DEVELOPMENT
258 AcpiExGenerateAccess (ObjDesc->CommonField.StartFieldBitOffset,
259 ObjDesc->CommonField.BitLength,
260 0xFFFFFFFF /* Temp until we pass RegionLength as parameter */);
261 BitLength = ByteAlignment * 8;
268 case AML_FIELD_ACCESS_BYTE:
269 case AML_FIELD_ACCESS_BUFFER: /* ACPI 2.0 (SMBus Buffer) */
274 case AML_FIELD_ACCESS_WORD:
279 case AML_FIELD_ACCESS_DWORD:
284 case AML_FIELD_ACCESS_QWORD: /* ACPI 2.0 */
290 /* Invalid field access type */
292 ACPI_ERROR ((AE_INFO,
293 "Unknown field access type 0x%X",
298 if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
301 * BufferField access can be on any byte boundary, so the
302 * ByteAlignment is always 1 byte -- regardless of any ByteAlignment
303 * implied by the field access type.
308 *ReturnByteAlignment = ByteAlignment;
309 return_VALUE (BitLength);
313 /*******************************************************************************
315 * FUNCTION: AcpiExPrepCommonFieldObject
317 * PARAMETERS: ObjDesc - The field object
318 * FieldFlags - Access, LockRule, and UpdateRule.
319 * The format of a FieldFlag is described
320 * in the ACPI specification
321 * FieldAttribute - Special attributes (not used)
322 * FieldBitPosition - Field start position
323 * FieldBitLength - Field length in number of bits
327 * DESCRIPTION: Initialize the areas of the field object that are common
328 * to the various types of fields. Note: This is very "sensitive"
329 * code because we are solving the general case for field
332 ******************************************************************************/
335 AcpiExPrepCommonFieldObject (
336 ACPI_OPERAND_OBJECT *ObjDesc,
338 UINT8 FieldAttribute,
339 UINT32 FieldBitPosition,
340 UINT32 FieldBitLength)
342 UINT32 AccessBitWidth;
343 UINT32 ByteAlignment;
344 UINT32 NearestByteAddress;
347 ACPI_FUNCTION_TRACE (ExPrepCommonFieldObject);
351 * Note: the structure being initialized is the
352 * ACPI_COMMON_FIELD_INFO; No structure fields outside of the common
353 * area are initialized by this procedure.
355 ObjDesc->CommonField.FieldFlags = FieldFlags;
356 ObjDesc->CommonField.Attribute = FieldAttribute;
357 ObjDesc->CommonField.BitLength = FieldBitLength;
360 * Decode the access type so we can compute offsets. The access type gives
361 * two pieces of information - the width of each field access and the
362 * necessary ByteAlignment (address granularity) of the access.
364 * For AnyAcc, the AccessBitWidth is the largest width that is both
365 * necessary and possible in an attempt to access the whole field in one
366 * I/O operation. However, for AnyAcc, the ByteAlignment is always one
369 * For all Buffer Fields, the ByteAlignment is always one byte.
371 * For all other access types (Byte, Word, Dword, Qword), the Bitwidth is
372 * the same (equivalent) as the ByteAlignment.
374 AccessBitWidth = AcpiExDecodeFieldAccess (ObjDesc, FieldFlags,
378 return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
381 /* Setup width (access granularity) fields (values are: 1, 2, 4, 8) */
383 ObjDesc->CommonField.AccessByteWidth = (UINT8)
384 ACPI_DIV_8 (AccessBitWidth);
387 * BaseByteOffset is the address of the start of the field within the
388 * region. It is the byte address of the first *datum* (field-width data
389 * unit) of the field. (i.e., the first datum that contains at least the
390 * first *bit* of the field.)
392 * Note: ByteAlignment is always either equal to the AccessBitWidth or 8
393 * (Byte access), and it defines the addressing granularity of the parent
397 ACPI_ROUND_BITS_DOWN_TO_BYTES (FieldBitPosition);
398 ObjDesc->CommonField.BaseByteOffset = (UINT32)
399 ACPI_ROUND_DOWN (NearestByteAddress, ByteAlignment);
402 * StartFieldBitOffset is the offset of the first bit of the field within
405 ObjDesc->CommonField.StartFieldBitOffset = (UINT8)
406 (FieldBitPosition - ACPI_MUL_8 (ObjDesc->CommonField.BaseByteOffset));
408 return_ACPI_STATUS (AE_OK);
412 /*******************************************************************************
414 * FUNCTION: AcpiExPrepFieldValue
416 * PARAMETERS: Info - Contains all field creation info
420 * DESCRIPTION: Construct an object of type ACPI_OPERAND_OBJECT with a
421 * subtype of DefField and connect it to the parent Node.
423 ******************************************************************************/
426 AcpiExPrepFieldValue (
427 ACPI_CREATE_FIELD_INFO *Info)
429 ACPI_OPERAND_OBJECT *ObjDesc;
430 ACPI_OPERAND_OBJECT *SecondDesc = NULL;
432 UINT32 AccessByteWidth;
436 ACPI_FUNCTION_TRACE (ExPrepFieldValue);
439 /* Parameter validation */
441 if (Info->FieldType != ACPI_TYPE_LOCAL_INDEX_FIELD)
443 if (!Info->RegionNode)
445 ACPI_ERROR ((AE_INFO, "Null RegionNode"));
446 return_ACPI_STATUS (AE_AML_NO_OPERAND);
449 Type = AcpiNsGetType (Info->RegionNode);
450 if (Type != ACPI_TYPE_REGION)
452 ACPI_ERROR ((AE_INFO, "Needed Region, found type 0x%X (%s)",
453 Type, AcpiUtGetTypeName (Type)));
455 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
459 /* Allocate a new field object */
461 ObjDesc = AcpiUtCreateInternalObject (Info->FieldType);
464 return_ACPI_STATUS (AE_NO_MEMORY);
467 /* Initialize areas of the object that are common to all fields */
469 ObjDesc->CommonField.Node = Info->FieldNode;
470 Status = AcpiExPrepCommonFieldObject (ObjDesc,
471 Info->FieldFlags, Info->Attribute,
472 Info->FieldBitPosition, Info->FieldBitLength);
473 if (ACPI_FAILURE (Status))
475 AcpiUtDeleteObjectDesc (ObjDesc);
476 return_ACPI_STATUS (Status);
479 /* Initialize areas of the object that are specific to the field type */
481 switch (Info->FieldType)
483 case ACPI_TYPE_LOCAL_REGION_FIELD:
485 ObjDesc->Field.RegionObj = AcpiNsGetAttachedObject (Info->RegionNode);
487 /* Fields specific to GenericSerialBus fields */
489 ObjDesc->Field.AccessLength = Info->AccessLength;
491 if (Info->ConnectionNode)
493 SecondDesc = Info->ConnectionNode->Object;
494 if (!(SecondDesc->Common.Flags & AOPOBJ_DATA_VALID))
496 Status = AcpiDsGetBufferArguments (SecondDesc);
497 if (ACPI_FAILURE (Status))
499 AcpiUtDeleteObjectDesc (ObjDesc);
500 return_ACPI_STATUS (Status);
504 ObjDesc->Field.ResourceBuffer = SecondDesc->Buffer.Pointer;
505 ObjDesc->Field.ResourceLength = (UINT16) SecondDesc->Buffer.Length;
507 else if (Info->ResourceBuffer)
509 ObjDesc->Field.ResourceBuffer = Info->ResourceBuffer;
510 ObjDesc->Field.ResourceLength = Info->ResourceLength;
513 /* Allow full data read from EC address space */
515 if ((ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_EC) &&
516 (ObjDesc->CommonField.BitLength > 8))
518 AccessByteWidth = ACPI_ROUND_BITS_UP_TO_BYTES (
519 ObjDesc->CommonField.BitLength);
521 /* Maximum byte width supported is 255 */
523 if (AccessByteWidth < 256)
525 ObjDesc->CommonField.AccessByteWidth = (UINT8) AccessByteWidth;
529 /* An additional reference for the container */
531 AcpiUtAddReference (ObjDesc->Field.RegionObj);
533 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
534 "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n",
535 ObjDesc->Field.StartFieldBitOffset, ObjDesc->Field.BaseByteOffset,
536 ObjDesc->Field.AccessByteWidth, ObjDesc->Field.RegionObj));
540 case ACPI_TYPE_LOCAL_BANK_FIELD:
542 ObjDesc->BankField.Value = Info->BankValue;
543 ObjDesc->BankField.RegionObj =
544 AcpiNsGetAttachedObject (Info->RegionNode);
545 ObjDesc->BankField.BankObj =
546 AcpiNsGetAttachedObject (Info->RegisterNode);
548 /* An additional reference for the attached objects */
550 AcpiUtAddReference (ObjDesc->BankField.RegionObj);
551 AcpiUtAddReference (ObjDesc->BankField.BankObj);
553 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
554 "Bank Field: BitOff %X, Off %X, Gran %X, Region %p, BankReg %p\n",
555 ObjDesc->BankField.StartFieldBitOffset,
556 ObjDesc->BankField.BaseByteOffset,
557 ObjDesc->Field.AccessByteWidth,
558 ObjDesc->BankField.RegionObj,
559 ObjDesc->BankField.BankObj));
562 * Remember location in AML stream of the field unit
563 * opcode and operands -- since the BankValue
564 * operands must be evaluated.
566 SecondDesc = ObjDesc->Common.NextObject;
567 SecondDesc->Extra.AmlStart = ACPI_CAST_PTR (ACPI_PARSE_OBJECT,
568 Info->DataRegisterNode)->Named.Data;
569 SecondDesc->Extra.AmlLength = ACPI_CAST_PTR (ACPI_PARSE_OBJECT,
570 Info->DataRegisterNode)->Named.Length;
575 case ACPI_TYPE_LOCAL_INDEX_FIELD:
577 /* Get the Index and Data registers */
579 ObjDesc->IndexField.IndexObj =
580 AcpiNsGetAttachedObject (Info->RegisterNode);
581 ObjDesc->IndexField.DataObj =
582 AcpiNsGetAttachedObject (Info->DataRegisterNode);
584 if (!ObjDesc->IndexField.DataObj || !ObjDesc->IndexField.IndexObj)
586 ACPI_ERROR ((AE_INFO, "Null Index Object during field prep"));
587 AcpiUtDeleteObjectDesc (ObjDesc);
588 return_ACPI_STATUS (AE_AML_INTERNAL);
591 /* An additional reference for the attached objects */
593 AcpiUtAddReference (ObjDesc->IndexField.DataObj);
594 AcpiUtAddReference (ObjDesc->IndexField.IndexObj);
597 * April 2006: Changed to match MS behavior
599 * The value written to the Index register is the byte offset of the
600 * target field in units of the granularity of the IndexField
602 * Previously, the value was calculated as an index in terms of the
603 * width of the Data register, as below:
605 * ObjDesc->IndexField.Value = (UINT32)
606 * (Info->FieldBitPosition / ACPI_MUL_8 (
607 * ObjDesc->Field.AccessByteWidth));
609 * February 2006: Tried value as a byte offset:
610 * ObjDesc->IndexField.Value = (UINT32)
611 * ACPI_DIV_8 (Info->FieldBitPosition);
613 ObjDesc->IndexField.Value = (UINT32) ACPI_ROUND_DOWN (
614 ACPI_DIV_8 (Info->FieldBitPosition),
615 ObjDesc->IndexField.AccessByteWidth);
617 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
618 "IndexField: BitOff %X, Off %X, Value %X, Gran %X, Index %p, Data %p\n",
619 ObjDesc->IndexField.StartFieldBitOffset,
620 ObjDesc->IndexField.BaseByteOffset,
621 ObjDesc->IndexField.Value,
622 ObjDesc->Field.AccessByteWidth,
623 ObjDesc->IndexField.IndexObj,
624 ObjDesc->IndexField.DataObj));
628 /* No other types should get here */
633 * Store the constructed descriptor (ObjDesc) into the parent Node,
634 * preserving the current type of that NamedObj.
636 Status = AcpiNsAttachObject (Info->FieldNode, ObjDesc,
637 AcpiNsGetType (Info->FieldNode));
639 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Set NamedObj %p [%4.4s], ObjDesc %p\n",
640 Info->FieldNode, AcpiUtGetNodeName (Info->FieldNode), ObjDesc));
642 /* Remove local reference to the object */
644 AcpiUtRemoveReference (ObjDesc);
645 return_ACPI_STATUS (Status);