FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/executer/exprep.c

     /******************************************************************************
      *
      * Module Name: exprep - ACPI AML field prep utilities
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 1. Copyright Notice
     *
     * Some or all of this work - Copyright (c) 1999 - 2022, 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 <contrib/dev/acpica/include/acpi.h>
   #include <contrib/dev/acpica/include/accommon.h>
   #include <contrib/dev/acpica/include/acinterp.h>
   #include <contrib/dev/acpica/include/amlcode.h>
   #include <contrib/dev/acpica/include/acnamesp.h>
   #include <contrib/dev/acpica/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);
   }

Cache object: 5496df6de063cd9397fa4b6d396a84db