LXR 6.1/​bsps/​shared/​acpi/​acpica/​executer/​exprep.c	Source navigation Diff markup Identifier search General search
	Version: 6.1 Revert   Change

File indexing completed on 2025-05-11 08:24:02

 /******************************************************************************
  *
  * Module Name: exprep - ACPI AML field prep utilities
  *
  *****************************************************************************/
 
 /******************************************************************************
  *
  * 1. Copyright Notice
  *
  * Some or all of this work - Copyright (c) 1999 - 2024, Intel Corp.
  * All rights reserved.
  *
  * 2. License
  *
  * 2.1. This is your license from Intel Corp. under its intellectual property
  * rights. You may have additional license terms from the party that provided
  * you this software, covering your right to use that party's intellectual
  * property rights.
  *
  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  * copy of the source code appearing in this file ("Covered Code") an
  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  * base code distributed originally by Intel ("Original Intel Code") to copy,
  * make derivatives, distribute, use and display any portion of the Covered
  * Code in any form, with the right to sublicense such rights; and
  *
  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  * license (with the right to sublicense), under only those claims of Intel
  * patents that are infringed by the Original Intel Code, to make, use, sell,
  * offer to sell, and import the Covered Code and derivative works thereof
  * solely to the minimum extent necessary to exercise the above copyright
  * license, and in no event shall the patent license extend to any additions
  * to or modifications of the Original Intel Code. No other license or right
  * is granted directly or by implication, estoppel or otherwise;
  *
  * The above copyright and patent license is granted only if the following
  * conditions are met:
  *
  * 3. Conditions
  *
  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification with rights to further distribute source must include
  * the above Copyright Notice, the above License, this list of Conditions,
  * and the following Disclaimer and Export Compliance provision. In addition,
  * Licensee must cause all Covered Code to which Licensee contributes to
  * contain a file documenting the changes Licensee made to create that Covered
  * Code and the date of any change. Licensee must include in that file the
  * documentation of any changes made by any predecessor Licensee. Licensee
  * must include a prominent statement that the modification is derived,
  * directly or indirectly, from Original Intel Code.
  *
  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification without rights to further distribute source must
  * include the following Disclaimer and Export Compliance provision in the
  * documentation and/or other materials provided with distribution. In
  * addition, Licensee may not authorize further sublicense of source of any
  * portion of the Covered Code, and must include terms to the effect that the
  * license from Licensee to its licensee is limited to the intellectual
  * property embodied in the software Licensee provides to its licensee, and
  * not to intellectual property embodied in modifications its licensee may
  * make.
  *
  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  * substantial portion of the Covered Code or modification must reproduce the
  * above Copyright Notice, and the following Disclaimer and Export Compliance
  * provision in the documentation and/or other materials provided with the
  * distribution.
  *
  * 3.4. Intel retains all right, title, and interest in and to the Original
  * Intel Code.
  *
  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  * Intel shall be used in advertising or otherwise to promote the sale, use or
  * other dealings in products derived from or relating to the Covered Code
  * without prior written authorization from Intel.
  *
  * 4. Disclaimer and Export Compliance
  *
  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
  * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
  * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  * PARTICULAR PURPOSE.
  *
  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  * LIMITED REMEDY.
  *
  * 4.3. Licensee shall not export, either directly or indirectly, any of this
  * software or system incorporating such software without first obtaining any
  * required license or other approval from the U. S. Department of Commerce or
  * any other agency or department of the United States Government. In the
  * event Licensee exports any such software from the United States or
  * re-exports any such software from a foreign destination, Licensee shall
  * ensure that the distribution and export/re-export of the software is in
  * compliance with all laws, regulations, orders, or other restrictions of the
  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
  * any of its subsidiaries will export/re-export any technical data, process,
  * software, or service, directly or indirectly, to any country for which the
  * United States government or any agency thereof requires an export license,
  * other governmental approval, or letter of assurance, without first obtaining
  * such license, approval or letter.
  *
  *****************************************************************************
  *
  * Alternatively, you may choose to be licensed under the terms of the
  * following license:
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions, and the following disclaimer,
  *    without modification.
  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  *    substantially similar to the "NO WARRANTY" disclaimer below
  *    ("Disclaimer") and any redistribution must be conditioned upon
  *    including a substantially similar Disclaimer requirement for further
  *    binary redistribution.
  * 3. Neither the names of the above-listed copyright holders nor the names
  *    of any contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * Alternatively, you may choose to be licensed under the terms of the
  * GNU General Public License ("GPL") version 2 as published by the Free
  * Software Foundation.
  *
  *****************************************************************************/
 
 #include "acpi.h"
 #include "accommon.h"
 #include "acinterp.h"
 #include "amlcode.h"
 #include "acnamesp.h"
 #include "acdispat.h"
 
 
 #define _COMPONENT          ACPI_EXECUTER
         ACPI_MODULE_NAME    ("exprep")
 
 /* Local prototypes */
 
 static UINT32
 AcpiExDecodeFieldAccess (
     ACPI_OPERAND_OBJECT     *ObjDesc,
     UINT8                   FieldFlags,
     UINT32                  *ReturnByteAlignment);
 
 
 #ifdef ACPI_UNDER_DEVELOPMENT
 
 static UINT32
 AcpiExGenerateAccess (
     UINT32                  FieldBitOffset,
     UINT32                  FieldBitLength,
     UINT32                  RegionLength);
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExGenerateAccess
  *
  * PARAMETERS:  FieldBitOffset      - Start of field within parent region/buffer
  *              FieldBitLength      - Length of field in bits
  *              RegionLength        - Length of parent in bytes
  *
  * RETURN:      Field granularity (8, 16, 32 or 64) and
  *              ByteAlignment (1, 2, 3, or 4)
  *
  * DESCRIPTION: Generate an optimal access width for fields defined with the
  *              AnyAcc keyword.
  *
  * NOTE: Need to have the RegionLength in order to check for boundary
  *       conditions (end-of-region). However, the RegionLength is a deferred
  *       operation. Therefore, to complete this implementation, the generation
  *       of this access width must be deferred until the region length has
  *       been evaluated.
  *
  ******************************************************************************/
 
 static UINT32
 AcpiExGenerateAccess (
     UINT32                  FieldBitOffset,
     UINT32                  FieldBitLength,
     UINT32                  RegionLength)
 {
     UINT32                  FieldByteLength;
     UINT32                  FieldByteOffset;
     UINT32                  FieldByteEndOffset;
     UINT32                  AccessByteWidth;
     UINT32                  FieldStartOffset;
     UINT32                  FieldEndOffset;
     UINT32                  MinimumAccessWidth = 0xFFFFFFFF;
     UINT32                  MinimumAccesses = 0xFFFFFFFF;
     UINT32                  Accesses;
 
 
     ACPI_FUNCTION_TRACE (ExGenerateAccess);
 
 
     /* Round Field start offset and length to "minimal" byte boundaries */
 
     FieldByteOffset = ACPI_DIV_8 (
         ACPI_ROUND_DOWN (FieldBitOffset, 8));
 
     FieldByteEndOffset = ACPI_DIV_8 (
         ACPI_ROUND_UP (FieldBitLength + FieldBitOffset, 8));
 
     FieldByteLength = FieldByteEndOffset - FieldByteOffset;
 
     ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
         "Bit length %u, Bit offset %u\n",
         FieldBitLength, FieldBitOffset));
 
     ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
         "Byte Length %u, Byte Offset %u, End Offset %u\n",
         FieldByteLength, FieldByteOffset, FieldByteEndOffset));
 
     /*
      * Iterative search for the maximum access width that is both aligned
      * and does not go beyond the end of the region
      *
      * Start at ByteAcc and work upwards to QwordAcc max. (1,2,4,8 bytes)
      */
     for (AccessByteWidth = 1; AccessByteWidth <= 8; AccessByteWidth <<= 1)
     {
         /*
          * 1) Round end offset up to next access boundary and make sure that
          *    this does not go beyond the end of the parent region.
          * 2) When the Access width is greater than the FieldByteLength, we
          *    are done. (This does not optimize for the perfectly aligned
          *    case yet).
          */
         if (ACPI_ROUND_UP (FieldByteEndOffset, AccessByteWidth) <=
             RegionLength)
         {
             FieldStartOffset =
                 ACPI_ROUND_DOWN (FieldByteOffset, AccessByteWidth) /
                 AccessByteWidth;
 
             FieldEndOffset =
                 ACPI_ROUND_UP ((FieldByteLength + FieldByteOffset),
                     AccessByteWidth) / AccessByteWidth;
 
             Accesses = FieldEndOffset - FieldStartOffset;
 
             ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                 "AccessWidth %u end is within region\n", AccessByteWidth));
 
             ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                 "Field Start %u, Field End %u -- requires %u accesses\n",
                 FieldStartOffset, FieldEndOffset, Accesses));
 
             /* Single access is optimal */
 
             if (Accesses <= 1)
             {
                 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                     "Entire field can be accessed "
                     "with one operation of size %u\n",
                     AccessByteWidth));
                 return_VALUE (AccessByteWidth);
             }
 
             /*
              * Fits in the region, but requires more than one read/write.
              * try the next wider access on next iteration
              */
             if (Accesses < MinimumAccesses)
             {
                 MinimumAccesses = Accesses;
                 MinimumAccessWidth = AccessByteWidth;
             }
         }
         else
         {
             ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                 "AccessWidth %u end is NOT within region\n",
                 AccessByteWidth));
             if (AccessByteWidth == 1)
             {
                 ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                     "Field goes beyond end-of-region!\n"));
 
                 /* Field does not fit in the region at all */
 
                 return_VALUE (0);
             }
 
             /*
              * This width goes beyond the end-of-region, back off to
              * previous access
              */
             ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                 "Backing off to previous optimal access width of %u\n",
                 MinimumAccessWidth));
             return_VALUE (MinimumAccessWidth);
         }
     }
 
     /*
      * Could not read/write field with one operation,
      * just use max access width
      */
     ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
         "Cannot access field in one operation, using width 8\n"));
 
     return_VALUE (8);
 }
 #endif /* ACPI_UNDER_DEVELOPMENT */
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExDecodeFieldAccess
  *
  * PARAMETERS:  ObjDesc             - Field object
  *              FieldFlags          - Encoded fieldflags (contains access bits)
  *              ReturnByteAlignment - Where the byte alignment is returned
  *
  * RETURN:      Field granularity (8, 16, 32 or 64) and
  *              ByteAlignment (1, 2, 3, or 4)
  *
  * DESCRIPTION: Decode the AccessType bits of a field definition.
  *
  ******************************************************************************/
 
 static UINT32
 AcpiExDecodeFieldAccess (
     ACPI_OPERAND_OBJECT     *ObjDesc,
     UINT8                   FieldFlags,
     UINT32                  *ReturnByteAlignment)
 {
     UINT32                  Access;
     UINT32                  ByteAlignment;
     UINT32                  BitLength;
 
 
     ACPI_FUNCTION_TRACE (ExDecodeFieldAccess);
 
 
     Access = (FieldFlags & AML_FIELD_ACCESS_TYPE_MASK);
 
     switch (Access)
     {
     case AML_FIELD_ACCESS_ANY:
 
 #ifdef ACPI_UNDER_DEVELOPMENT
         ByteAlignment =
             AcpiExGenerateAccess (ObjDesc->CommonField.StartFieldBitOffset,
                 ObjDesc->CommonField.BitLength,
                 0xFFFFFFFF /* Temp until we pass RegionLength as parameter */);
         BitLength = ByteAlignment * 8;
 #endif
 
         ByteAlignment = 1;
         BitLength = 8;
         break;
 
     case AML_FIELD_ACCESS_BYTE:
     case AML_FIELD_ACCESS_BUFFER:   /* ACPI 2.0 (SMBus Buffer) */
 
         ByteAlignment = 1;
         BitLength     = 8;
         break;
 
     case AML_FIELD_ACCESS_WORD:
 
         ByteAlignment = 2;
         BitLength     = 16;
         break;
 
     case AML_FIELD_ACCESS_DWORD:
 
         ByteAlignment = 4;
         BitLength     = 32;
         break;
 
     case AML_FIELD_ACCESS_QWORD:    /* ACPI 2.0 */
 
         ByteAlignment = 8;
         BitLength     = 64;
         break;
 
     default:
 
         /* Invalid field access type */
 
         ACPI_ERROR ((AE_INFO,
             "Unknown field access type 0x%X",
             Access));
 
         return_UINT32 (0);
     }
 
     if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
     {
         /*
          * BufferField access can be on any byte boundary, so the
          * ByteAlignment is always 1 byte -- regardless of any ByteAlignment
          * implied by the field access type.
          */
         ByteAlignment = 1;
     }
 
     *ReturnByteAlignment = ByteAlignment;
     return_UINT32 (BitLength);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExPrepCommonFieldObject
  *
  * PARAMETERS:  ObjDesc             - The field object
  *              FieldFlags          - Access, LockRule, and UpdateRule.
  *                                    The format of a FieldFlag is described
  *                                    in the ACPI specification
  *              FieldAttribute      - Special attributes (not used)
  *              FieldBitPosition    - Field start position
  *              FieldBitLength      - Field length in number of bits
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Initialize the areas of the field object that are common
  *              to the various types of fields. Note: This is very "sensitive"
  *              code because we are solving the general case for field
  *              alignment.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiExPrepCommonFieldObject (
     ACPI_OPERAND_OBJECT     *ObjDesc,
     UINT8                   FieldFlags,
     UINT8                   FieldAttribute,
     UINT32                  FieldBitPosition,
     UINT32                  FieldBitLength)
 {
     UINT32                  AccessBitWidth;
     UINT32                  ByteAlignment;
     UINT32                  NearestByteAddress;
 
 
     ACPI_FUNCTION_TRACE (ExPrepCommonFieldObject);
 
 
     /*
      * Note: the structure being initialized is the
      * ACPI_COMMON_FIELD_INFO;  No structure fields outside of the common
      * area are initialized by this procedure.
      */
     ObjDesc->CommonField.FieldFlags = FieldFlags;
     ObjDesc->CommonField.Attribute  = FieldAttribute;
     ObjDesc->CommonField.BitLength  = FieldBitLength;
 
     /*
      * Decode the access type so we can compute offsets. The access type gives
      * two pieces of information - the width of each field access and the
      * necessary ByteAlignment (address granularity) of the access.
      *
      * For AnyAcc, the AccessBitWidth is the largest width that is both
      * necessary and possible in an attempt to access the whole field in one
      * I/O operation. However, for AnyAcc, the ByteAlignment is always one
      * byte.
      *
      * For all Buffer Fields, the ByteAlignment is always one byte.
      *
      * For all other access types (Byte, Word, Dword, Qword), the Bitwidth is
      * the same (equivalent) as the ByteAlignment.
      */
     AccessBitWidth = AcpiExDecodeFieldAccess (
         ObjDesc, FieldFlags, &ByteAlignment);
     if (!AccessBitWidth)
     {
         return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
     }
 
     /* Setup width (access granularity) fields (values are: 1, 2, 4, 8) */
 
     ObjDesc->CommonField.AccessByteWidth = (UINT8)
         ACPI_DIV_8 (AccessBitWidth);
 
     /*
      * BaseByteOffset is the address of the start of the field within the
      * region. It is the byte address of the first *datum* (field-width data
      * unit) of the field. (i.e., the first datum that contains at least the
      * first *bit* of the field.)
      *
      * Note: ByteAlignment is always either equal to the AccessBitWidth or 8
      * (Byte access), and it defines the addressing granularity of the parent
      * region or buffer.
      */
     NearestByteAddress =
         ACPI_ROUND_BITS_DOWN_TO_BYTES (FieldBitPosition);
     ObjDesc->CommonField.BaseByteOffset = (UINT32)
         ACPI_ROUND_DOWN (NearestByteAddress, ByteAlignment);
 
     /*
      * StartFieldBitOffset is the offset of the first bit of the field within
      * a field datum.
      */
     ObjDesc->CommonField.StartFieldBitOffset = (UINT8)
         (FieldBitPosition - ACPI_MUL_8 (ObjDesc->CommonField.BaseByteOffset));
 
     return_ACPI_STATUS (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExPrepFieldValue
  *
  * PARAMETERS:  Info    - Contains all field creation info
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Construct an object of type ACPI_OPERAND_OBJECT with a
  *              subtype of DefField and connect it to the parent Node.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiExPrepFieldValue (
     ACPI_CREATE_FIELD_INFO  *Info)
 {
     ACPI_OPERAND_OBJECT     *ObjDesc;
     ACPI_OPERAND_OBJECT     *SecondDesc = NULL;
     ACPI_STATUS             Status;
     UINT32                  AccessByteWidth;
     UINT32                  Type;
 
 
     ACPI_FUNCTION_TRACE (ExPrepFieldValue);
 
 
     /* Parameter validation */
 
     if (Info->FieldType != ACPI_TYPE_LOCAL_INDEX_FIELD)
     {
         if (!Info->RegionNode)
         {
             ACPI_ERROR ((AE_INFO, "Null RegionNode"));
             return_ACPI_STATUS (AE_AML_NO_OPERAND);
         }
 
         Type = AcpiNsGetType (Info->RegionNode);
         if (Type != ACPI_TYPE_REGION)
         {
             ACPI_ERROR ((AE_INFO, "Needed Region, found type 0x%X (%s)",
                 Type, AcpiUtGetTypeName (Type)));
 
             return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
         }
     }
 
     /* Allocate a new field object */
 
     ObjDesc = AcpiUtCreateInternalObject (Info->FieldType);
     if (!ObjDesc)
     {
         return_ACPI_STATUS (AE_NO_MEMORY);
     }
 
     /* Initialize areas of the object that are common to all fields */
 
     ObjDesc->CommonField.Node = Info->FieldNode;
     Status = AcpiExPrepCommonFieldObject (ObjDesc,
         Info->FieldFlags, Info->Attribute,
         Info->FieldBitPosition, Info->FieldBitLength);
     if (ACPI_FAILURE (Status))
     {
         AcpiUtDeleteObjectDesc (ObjDesc);
         return_ACPI_STATUS (Status);
     }
 
     /* Initialize areas of the object that are specific to the field type */
 
     switch (Info->FieldType)
     {
     case ACPI_TYPE_LOCAL_REGION_FIELD:
 
         ObjDesc->Field.RegionObj = AcpiNsGetAttachedObject (Info->RegionNode);
 
         /* Fields specific to GenericSerialBus fields */
 
         ObjDesc->Field.AccessLength = Info->AccessLength;
 
         if (Info->ConnectionNode)
         {
             SecondDesc = Info->ConnectionNode->Object;
             if (!(SecondDesc->Common.Flags & AOPOBJ_DATA_VALID))
             {
                 Status = AcpiDsGetBufferArguments (SecondDesc);
                 if (ACPI_FAILURE (Status))
                 {
                     AcpiUtDeleteObjectDesc (ObjDesc);
                     return_ACPI_STATUS (Status);
                 }
             }
 
             ObjDesc->Field.ResourceBuffer =
                 SecondDesc->Buffer.Pointer;
             ObjDesc->Field.ResourceLength =
                 (UINT16) SecondDesc->Buffer.Length;
         }
         else if (Info->ResourceBuffer)
         {
             ObjDesc->Field.ResourceBuffer = Info->ResourceBuffer;
             ObjDesc->Field.ResourceLength = Info->ResourceLength;
         }
 
         ObjDesc->Field.PinNumberIndex = Info->PinNumberIndex;
 
         /* Allow full data read from EC address space */
 
         if ((ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_EC) &&
             (ObjDesc->CommonField.BitLength > 8))
         {
             AccessByteWidth = ACPI_ROUND_BITS_UP_TO_BYTES (
                 ObjDesc->CommonField.BitLength);
 
             /* Maximum byte width supported is 255 */
 
             if (AccessByteWidth < 256)
             {
                 ObjDesc->CommonField.AccessByteWidth =
                     (UINT8) AccessByteWidth;
             }
         }
 
         ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
             "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n",
             ObjDesc->Field.StartFieldBitOffset,
             ObjDesc->Field.BaseByteOffset,
             ObjDesc->Field.AccessByteWidth,
             ObjDesc->Field.RegionObj));
         break;
 
     case ACPI_TYPE_LOCAL_BANK_FIELD:
 
         ObjDesc->BankField.Value = Info->BankValue;
         ObjDesc->BankField.RegionObj =
             AcpiNsGetAttachedObject (Info->RegionNode);
         ObjDesc->BankField.BankObj =
             AcpiNsGetAttachedObject (Info->RegisterNode);
 
         /* An additional reference for the attached objects */
 
         AcpiUtAddReference (ObjDesc->BankField.RegionObj);
         AcpiUtAddReference (ObjDesc->BankField.BankObj);
 
         ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
             "Bank Field: BitOff %X, Off %X, Gran %X, Region %p, BankReg %p\n",
             ObjDesc->BankField.StartFieldBitOffset,
             ObjDesc->BankField.BaseByteOffset,
             ObjDesc->Field.AccessByteWidth,
             ObjDesc->BankField.RegionObj,
             ObjDesc->BankField.BankObj));
 
         /*
          * Remember location in AML stream of the field unit
          * opcode and operands -- since the BankValue
          * operands must be evaluated.
          */
         SecondDesc = ObjDesc->Common.NextObject;
         SecondDesc->Extra.AmlStart = ACPI_CAST_PTR (ACPI_PARSE_OBJECT,
             Info->DataRegisterNode)->Named.Data;
         SecondDesc->Extra.AmlLength = ACPI_CAST_PTR (ACPI_PARSE_OBJECT,
             Info->DataRegisterNode)->Named.Length;
 
         break;
 
     case ACPI_TYPE_LOCAL_INDEX_FIELD:
 
         /* Get the Index and Data registers */
 
         ObjDesc->IndexField.IndexObj =
             AcpiNsGetAttachedObject (Info->RegisterNode);
         ObjDesc->IndexField.DataObj =
             AcpiNsGetAttachedObject (Info->DataRegisterNode);
 
         if (!ObjDesc->IndexField.DataObj || !ObjDesc->IndexField.IndexObj)
         {
             ACPI_ERROR ((AE_INFO, "Null Index Object during field prep"));
             AcpiUtDeleteObjectDesc (ObjDesc);
             return_ACPI_STATUS (AE_AML_INTERNAL);
         }
 
         /* An additional reference for the attached objects */
 
         AcpiUtAddReference (ObjDesc->IndexField.DataObj);
         AcpiUtAddReference (ObjDesc->IndexField.IndexObj);
 
         /*
          * April 2006: Changed to match MS behavior
          *
          * The value written to the Index register is the byte offset of the
          * target field in units of the granularity of the IndexField
          *
          * Previously, the value was calculated as an index in terms of the
          * width of the Data register, as below:
          *
          *      ObjDesc->IndexField.Value = (UINT32)
          *          (Info->FieldBitPosition / ACPI_MUL_8 (
          *              ObjDesc->Field.AccessByteWidth));
          *
          * February 2006: Tried value as a byte offset:
          *      ObjDesc->IndexField.Value = (UINT32)
          *          ACPI_DIV_8 (Info->FieldBitPosition);
          */
         ObjDesc->IndexField.Value = (UINT32) ACPI_ROUND_DOWN (
             ACPI_DIV_8 (Info->FieldBitPosition),
             ObjDesc->IndexField.AccessByteWidth);
 
         ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
             "IndexField: BitOff %X, Off %X, Value %X, "
             "Gran %X, Index %p, Data %p\n",
             ObjDesc->IndexField.StartFieldBitOffset,
             ObjDesc->IndexField.BaseByteOffset,
             ObjDesc->IndexField.Value,
             ObjDesc->Field.AccessByteWidth,
             ObjDesc->IndexField.IndexObj,
             ObjDesc->IndexField.DataObj));
         break;
 
     default:
 
         /* No other types should get here */
 
         break;
     }
 
     /*
      * Store the constructed descriptor (ObjDesc) into the parent Node,
      * preserving the current type of that NamedObj.
      */
     Status = AcpiNsAttachObject (
         Info->FieldNode, ObjDesc, AcpiNsGetType (Info->FieldNode));
 
     ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
         "Set NamedObj %p [%4.4s], ObjDesc %p\n",
         Info->FieldNode, AcpiUtGetNodeName (Info->FieldNode), ObjDesc));
 
     /* Remove local reference to the object */
 
     AcpiUtRemoveReference (ObjDesc);
     return_ACPI_STATUS (Status);
 }

This page was automatically generated by the 2.3.7 LXR engine. The LXR team