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  1. /******************************************************************************
  2.  *
  3.  * Module Name: dsfield - Dispatcher field routines
  4.  *
  5.  *****************************************************************************/
  6.  
  7. /******************************************************************************
  8.  *
  9.  * 1. Copyright Notice
  10.  *
  11.  * Some or all of this work - Copyright (c) 1999 - 2010, 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. #define __DSFIELD_C__
  117.  
  118. #include "acpi.h"
  119. #include "accommon.h"
  120. #include "amlcode.h"
  121. #include "acdispat.h"
  122. #include "acinterp.h"
  123. #include "acnamesp.h"
  124. #include "acparser.h"
  125.  
  126.  
  127. #define _COMPONENT          ACPI_DISPATCHER
  128.         ACPI_MODULE_NAME    ("dsfield")
  129.  
  130. /* Local prototypes */
  131.  
  132. static ACPI_STATUS
  133. AcpiDsGetFieldNames (
  134.     ACPI_CREATE_FIELD_INFO  *Info,
  135.     ACPI_WALK_STATE         *WalkState,
  136.     ACPI_PARSE_OBJECT       *Arg);
  137.  
  138.  
  139. /*******************************************************************************
  140.  *
  141.  * FUNCTION:    AcpiDsCreateBufferField
  142.  *
  143.  * PARAMETERS:  Op                  - Current parse op (CreateXXField)
  144.  *              WalkState           - Current state
  145.  *
  146.  * RETURN:      Status
  147.  *
  148.  * DESCRIPTION: Execute the CreateField operators:
  149.  *              CreateBitFieldOp,
  150.  *              CreateByteFieldOp,
  151.  *              CreateWordFieldOp,
  152.  *              CreateDWordFieldOp,
  153.  *              CreateQWordFieldOp,
  154.  *              CreateFieldOp       (all of which define a field in a buffer)
  155.  *
  156.  ******************************************************************************/
  157.  
  158. ACPI_STATUS
  159. AcpiDsCreateBufferField (
  160.     ACPI_PARSE_OBJECT       *Op,
  161.     ACPI_WALK_STATE         *WalkState)
  162. {
  163.     ACPI_PARSE_OBJECT       *Arg;
  164.     ACPI_NAMESPACE_NODE     *Node;
  165.     ACPI_STATUS             Status;
  166.     ACPI_OPERAND_OBJECT     *ObjDesc;
  167.     ACPI_OPERAND_OBJECT     *SecondDesc = NULL;
  168.     UINT32                  Flags;
  169.  
  170.  
  171.     ACPI_FUNCTION_TRACE (DsCreateBufferField);
  172.  
  173.  
  174.     /*
  175.      * Get the NameString argument (name of the new BufferField)
  176.      */
  177.     if (Op->Common.AmlOpcode == AML_CREATE_FIELD_OP)
  178.     {
  179.         /* For CreateField, name is the 4th argument */
  180.  
  181.         Arg = AcpiPsGetArg (Op, 3);
  182.     }
  183.     else
  184.     {
  185.         /* For all other CreateXXXField operators, name is the 3rd argument */
  186.  
  187.         Arg = AcpiPsGetArg (Op, 2);
  188.     }
  189.  
  190.     if (!Arg)
  191.     {
  192.         return_ACPI_STATUS (AE_AML_NO_OPERAND);
  193.     }
  194.  
  195.     if (WalkState->DeferredNode)
  196.     {
  197.         Node = WalkState->DeferredNode;
  198.         Status = AE_OK;
  199.     }
  200.     else
  201.     {
  202.         /* Execute flag should always be set when this function is entered */
  203.  
  204.         if (!(WalkState->ParseFlags & ACPI_PARSE_EXECUTE))
  205.         {
  206.             return_ACPI_STATUS (AE_AML_INTERNAL);
  207.         }
  208.  
  209.         /* Creating new namespace node, should not already exist */
  210.  
  211.         Flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
  212.                 ACPI_NS_ERROR_IF_FOUND;
  213.  
  214.         /*
  215.          * Mark node temporary if we are executing a normal control
  216.          * method. (Don't mark if this is a module-level code method)
  217.          */
  218.         if (WalkState->MethodNode &&
  219.             !(WalkState->ParseFlags & ACPI_PARSE_MODULE_LEVEL))
  220.         {
  221.             Flags |= ACPI_NS_TEMPORARY;
  222.         }
  223.  
  224.         /* Enter the NameString into the namespace */
  225.  
  226.         Status = AcpiNsLookup (WalkState->ScopeInfo, Arg->Common.Value.String,
  227.                     ACPI_TYPE_ANY, ACPI_IMODE_LOAD_PASS1,
  228.                     Flags, WalkState, &Node);
  229.         if (ACPI_FAILURE (Status))
  230.         {
  231.             ACPI_ERROR_NAMESPACE (Arg->Common.Value.String, Status);
  232.             return_ACPI_STATUS (Status);
  233.         }
  234.     }
  235.  
  236.     /*
  237.      * We could put the returned object (Node) on the object stack for later,
  238.      * but for now, we will put it in the "op" object that the parser uses,
  239.      * so we can get it again at the end of this scope.
  240.      */
  241.     Op->Common.Node = Node;
  242.  
  243.     /*
  244.      * If there is no object attached to the node, this node was just created
  245.      * and we need to create the field object. Otherwise, this was a lookup
  246.      * of an existing node and we don't want to create the field object again.
  247.      */
  248.     ObjDesc = AcpiNsGetAttachedObject (Node);
  249.     if (ObjDesc)
  250.     {
  251.         return_ACPI_STATUS (AE_OK);
  252.     }
  253.  
  254.     /*
  255.      * The Field definition is not fully parsed at this time.
  256.      * (We must save the address of the AML for the buffer and index operands)
  257.      */
  258.  
  259.     /* Create the buffer field object */
  260.  
  261.     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_BUFFER_FIELD);
  262.     if (!ObjDesc)
  263.     {
  264.         Status = AE_NO_MEMORY;
  265.         goto Cleanup;
  266.     }
  267.  
  268.     /*
  269.      * Remember location in AML stream of the field unit opcode and operands --
  270.      * since the buffer and index operands must be evaluated.
  271.      */
  272.     SecondDesc                  = ObjDesc->Common.NextObject;
  273.     SecondDesc->Extra.AmlStart  = Op->Named.Data;
  274.     SecondDesc->Extra.AmlLength = Op->Named.Length;
  275.     ObjDesc->BufferField.Node   = Node;
  276.  
  277.     /* Attach constructed field descriptors to parent node */
  278.  
  279.     Status = AcpiNsAttachObject (Node, ObjDesc, ACPI_TYPE_BUFFER_FIELD);
  280.     if (ACPI_FAILURE (Status))
  281.     {
  282.         goto Cleanup;
  283.     }
  284.  
  285.  
  286. Cleanup:
  287.  
  288.     /* Remove local reference to the object */
  289.  
  290.     AcpiUtRemoveReference (ObjDesc);
  291.     return_ACPI_STATUS (Status);
  292. }
  293.  
  294.  
  295. /*******************************************************************************
  296.  *
  297.  * FUNCTION:    AcpiDsGetFieldNames
  298.  *
  299.  * PARAMETERS:  Info            - CreateField info structure
  300.  *  `           WalkState       - Current method state
  301.  *              Arg             - First parser arg for the field name list
  302.  *
  303.  * RETURN:      Status
  304.  *
  305.  * DESCRIPTION: Process all named fields in a field declaration.  Names are
  306.  *              entered into the namespace.
  307.  *
  308.  ******************************************************************************/
  309.  
  310. static ACPI_STATUS
  311. AcpiDsGetFieldNames (
  312.     ACPI_CREATE_FIELD_INFO  *Info,
  313.     ACPI_WALK_STATE         *WalkState,
  314.     ACPI_PARSE_OBJECT       *Arg)
  315. {
  316.     ACPI_STATUS             Status;
  317.     UINT64                  Position;
  318.  
  319.  
  320.     ACPI_FUNCTION_TRACE_PTR (DsGetFieldNames, Info);
  321.  
  322.  
  323.     /* First field starts at bit zero */
  324.  
  325.     Info->FieldBitPosition = 0;
  326.  
  327.     /* Process all elements in the field list (of parse nodes) */
  328.  
  329.     while (Arg)
  330.     {
  331.         /*
  332.          * Three types of field elements are handled:
  333.          * 1) Offset - specifies a bit offset
  334.          * 2) AccessAs - changes the access mode
  335.          * 3) Name - Enters a new named field into the namespace
  336.          */
  337.         switch (Arg->Common.AmlOpcode)
  338.         {
  339.         case AML_INT_RESERVEDFIELD_OP:
  340.  
  341.             Position = (UINT64) Info->FieldBitPosition
  342.                         + (UINT64) Arg->Common.Value.Size;
  343.  
  344.             if (Position > ACPI_UINT32_MAX)
  345.             {
  346.                 ACPI_ERROR ((AE_INFO,
  347.                     "Bit offset within field too large (> 0xFFFFFFFF)"));
  348.                 return_ACPI_STATUS (AE_SUPPORT);
  349.             }
  350.  
  351.             Info->FieldBitPosition = (UINT32) Position;
  352.             break;
  353.  
  354.  
  355.         case AML_INT_ACCESSFIELD_OP:
  356.  
  357.             /*
  358.              * Get a new AccessType and AccessAttribute -- to be used for all
  359.              * field units that follow, until field end or another AccessAs
  360.              * keyword.
  361.              *
  362.              * In FieldFlags, preserve the flag bits other than the
  363.              * ACCESS_TYPE bits
  364.              */
  365.             Info->FieldFlags = (UINT8)
  366.                 ((Info->FieldFlags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
  367.                 ((UINT8) ((UINT32) Arg->Common.Value.Integer >> 8)));
  368.  
  369.             Info->Attribute = (UINT8) (Arg->Common.Value.Integer);
  370.             break;
  371.  
  372.  
  373.         case AML_INT_NAMEDFIELD_OP:
  374.  
  375.             /* Lookup the name, it should already exist */
  376.  
  377.             Status = AcpiNsLookup (WalkState->ScopeInfo,
  378.                         (char *) &Arg->Named.Name, Info->FieldType,
  379.                         ACPI_IMODE_EXECUTE, ACPI_NS_DONT_OPEN_SCOPE,
  380.                         WalkState, &Info->FieldNode);
  381.             if (ACPI_FAILURE (Status))
  382.             {
  383.                 ACPI_ERROR_NAMESPACE ((char *) &Arg->Named.Name, Status);
  384.                 return_ACPI_STATUS (Status);
  385.             }
  386.             else
  387.             {
  388.                 Arg->Common.Node = Info->FieldNode;
  389.                 Info->FieldBitLength = Arg->Common.Value.Size;
  390.  
  391.                 /*
  392.                  * If there is no object attached to the node, this node was
  393.                  * just created and we need to create the field object.
  394.                  * Otherwise, this was a lookup of an existing node and we
  395.                  * don't want to create the field object again.
  396.                  */
  397.                 if (!AcpiNsGetAttachedObject (Info->FieldNode))
  398.                 {
  399.                     Status = AcpiExPrepFieldValue (Info);
  400.                     if (ACPI_FAILURE (Status))
  401.                     {
  402.                         return_ACPI_STATUS (Status);
  403.                     }
  404.                 }
  405.             }
  406.  
  407.             /* Keep track of bit position for the next field */
  408.  
  409.             Position = (UINT64) Info->FieldBitPosition
  410.                         + (UINT64) Arg->Common.Value.Size;
  411.  
  412.             if (Position > ACPI_UINT32_MAX)
  413.             {
  414.                 ACPI_ERROR ((AE_INFO,
  415.                     "Field [%4.4s] bit offset too large (> 0xFFFFFFFF)",
  416.                     ACPI_CAST_PTR (char, &Info->FieldNode->Name)));
  417.                 return_ACPI_STATUS (AE_SUPPORT);
  418.             }
  419.  
  420.             Info->FieldBitPosition += Info->FieldBitLength;
  421.             break;
  422.  
  423.  
  424.         default:
  425.  
  426.             ACPI_ERROR ((AE_INFO,
  427.                 "Invalid opcode in field list: 0x%X", Arg->Common.AmlOpcode));
  428.             return_ACPI_STATUS (AE_AML_BAD_OPCODE);
  429.         }
  430.  
  431.         Arg = Arg->Common.Next;
  432.     }
  433.  
  434.     return_ACPI_STATUS (AE_OK);
  435. }
  436.  
  437.  
  438. /*******************************************************************************
  439.  *
  440.  * FUNCTION:    AcpiDsCreateField
  441.  *
  442.  * PARAMETERS:  Op              - Op containing the Field definition and args
  443.  *              RegionNode      - Object for the containing Operation Region
  444.  *  `           WalkState       - Current method state
  445.  *
  446.  * RETURN:      Status
  447.  *
  448.  * DESCRIPTION: Create a new field in the specified operation region
  449.  *
  450.  ******************************************************************************/
  451.  
  452. ACPI_STATUS
  453. AcpiDsCreateField (
  454.     ACPI_PARSE_OBJECT       *Op,
  455.     ACPI_NAMESPACE_NODE     *RegionNode,
  456.     ACPI_WALK_STATE         *WalkState)
  457. {
  458.     ACPI_STATUS             Status;
  459.     ACPI_PARSE_OBJECT       *Arg;
  460.     ACPI_CREATE_FIELD_INFO  Info;
  461.  
  462.  
  463.     ACPI_FUNCTION_TRACE_PTR (DsCreateField, Op);
  464.  
  465.  
  466.     /* First arg is the name of the parent OpRegion (must already exist) */
  467.  
  468.     Arg = Op->Common.Value.Arg;
  469.     if (!RegionNode)
  470.     {
  471.         Status = AcpiNsLookup (WalkState->ScopeInfo, Arg->Common.Value.Name,
  472.                         ACPI_TYPE_REGION, ACPI_IMODE_EXECUTE,
  473.                         ACPI_NS_SEARCH_PARENT, WalkState, &RegionNode);
  474.         if (ACPI_FAILURE (Status))
  475.         {
  476.             ACPI_ERROR_NAMESPACE (Arg->Common.Value.Name, Status);
  477.             return_ACPI_STATUS (Status);
  478.         }
  479.     }
  480.  
  481.     /* Second arg is the field flags */
  482.  
  483.     Arg = Arg->Common.Next;
  484.     Info.FieldFlags = (UINT8) Arg->Common.Value.Integer;
  485.     Info.Attribute = 0;
  486.  
  487.     /* Each remaining arg is a Named Field */
  488.  
  489.     Info.FieldType = ACPI_TYPE_LOCAL_REGION_FIELD;
  490.     Info.RegionNode = RegionNode;
  491.  
  492.     Status = AcpiDsGetFieldNames (&Info, WalkState, Arg->Common.Next);
  493.  
  494.     return_ACPI_STATUS (Status);
  495. }
  496.  
  497.  
  498. /*******************************************************************************
  499.  *
  500.  * FUNCTION:    AcpiDsInitFieldObjects
  501.  *
  502.  * PARAMETERS:  Op              - Op containing the Field definition and args
  503.  *  `           WalkState       - Current method state
  504.  *
  505.  * RETURN:      Status
  506.  *
  507.  * DESCRIPTION: For each "Field Unit" name in the argument list that is
  508.  *              part of the field declaration, enter the name into the
  509.  *              namespace.
  510.  *
  511.  ******************************************************************************/
  512.  
  513. ACPI_STATUS
  514. AcpiDsInitFieldObjects (
  515.     ACPI_PARSE_OBJECT       *Op,
  516.     ACPI_WALK_STATE         *WalkState)
  517. {
  518.     ACPI_STATUS             Status;
  519.     ACPI_PARSE_OBJECT       *Arg = NULL;
  520.     ACPI_NAMESPACE_NODE     *Node;
  521.     UINT8                   Type = 0;
  522.     UINT32                  Flags;
  523.  
  524.  
  525.     ACPI_FUNCTION_TRACE_PTR (DsInitFieldObjects, Op);
  526.  
  527.  
  528.     /* Execute flag should always be set when this function is entered */
  529.  
  530.     if (!(WalkState->ParseFlags & ACPI_PARSE_EXECUTE))
  531.     {
  532.         if (WalkState->ParseFlags & ACPI_PARSE_DEFERRED_OP)
  533.         {
  534.             /* BankField Op is deferred, just return OK */
  535.  
  536.             return_ACPI_STATUS (AE_OK);
  537.         }
  538.  
  539.         return_ACPI_STATUS (AE_AML_INTERNAL);
  540.     }
  541.  
  542.     /*
  543.      * Get the FieldList argument for this opcode. This is the start of the
  544.      * list of field elements.
  545.      */
  546.     switch (WalkState->Opcode)
  547.     {
  548.     case AML_FIELD_OP:
  549.         Arg = AcpiPsGetArg (Op, 2);
  550.         Type = ACPI_TYPE_LOCAL_REGION_FIELD;
  551.         break;
  552.  
  553.     case AML_BANK_FIELD_OP:
  554.         Arg = AcpiPsGetArg (Op, 4);
  555.         Type = ACPI_TYPE_LOCAL_BANK_FIELD;
  556.         break;
  557.  
  558.     case AML_INDEX_FIELD_OP:
  559.         Arg = AcpiPsGetArg (Op, 3);
  560.         Type = ACPI_TYPE_LOCAL_INDEX_FIELD;
  561.         break;
  562.  
  563.     default:
  564.         return_ACPI_STATUS (AE_BAD_PARAMETER);
  565.     }
  566.  
  567.     /* Creating new namespace node(s), should not already exist */
  568.  
  569.     Flags = ACPI_NS_NO_UPSEARCH | ACPI_NS_DONT_OPEN_SCOPE |
  570.             ACPI_NS_ERROR_IF_FOUND;
  571.  
  572.     /*
  573.      * Mark node(s) temporary if we are executing a normal control
  574.      * method. (Don't mark if this is a module-level code method)
  575.      */
  576.     if (WalkState->MethodNode &&
  577.         !(WalkState->ParseFlags & ACPI_PARSE_MODULE_LEVEL))
  578.     {
  579.         Flags |= ACPI_NS_TEMPORARY;
  580.     }
  581.  
  582.     /*
  583.      * Walk the list of entries in the FieldList
  584.      * Note: FieldList can be of zero length. In this case, Arg will be NULL.
  585.      */
  586.     while (Arg)
  587.     {
  588.         /*
  589.          * Ignore OFFSET and ACCESSAS terms here; we are only interested in the
  590.          * field names in order to enter them into the namespace.
  591.          */
  592.         if (Arg->Common.AmlOpcode == AML_INT_NAMEDFIELD_OP)
  593.         {
  594.             Status = AcpiNsLookup (WalkState->ScopeInfo,
  595.                         (char *) &Arg->Named.Name, Type, ACPI_IMODE_LOAD_PASS1,
  596.                         Flags, WalkState, &Node);
  597.             if (ACPI_FAILURE (Status))
  598.             {
  599.                 ACPI_ERROR_NAMESPACE ((char *) &Arg->Named.Name, Status);
  600.                 if (Status != AE_ALREADY_EXISTS)
  601.                 {
  602.                     return_ACPI_STATUS (Status);
  603.                 }
  604.  
  605.                 /* Name already exists, just ignore this error */
  606.  
  607.                 Status = AE_OK;
  608.             }
  609.  
  610.             Arg->Common.Node = Node;
  611.         }
  612.  
  613.         /* Get the next field element in the list */
  614.  
  615.         Arg = Arg->Common.Next;
  616.     }
  617.  
  618.     return_ACPI_STATUS (AE_OK);
  619. }
  620.  
  621.  
  622. /*******************************************************************************
  623.  *
  624.  * FUNCTION:    AcpiDsCreateBankField
  625.  *
  626.  * PARAMETERS:  Op              - Op containing the Field definition and args
  627.  *              RegionNode      - Object for the containing Operation Region
  628.  *              WalkState       - Current method state
  629.  *
  630.  * RETURN:      Status
  631.  *
  632.  * DESCRIPTION: Create a new bank field in the specified operation region
  633.  *
  634.  ******************************************************************************/
  635.  
  636. ACPI_STATUS
  637. AcpiDsCreateBankField (
  638.     ACPI_PARSE_OBJECT       *Op,
  639.     ACPI_NAMESPACE_NODE     *RegionNode,
  640.     ACPI_WALK_STATE         *WalkState)
  641. {
  642.     ACPI_STATUS             Status;
  643.     ACPI_PARSE_OBJECT       *Arg;
  644.     ACPI_CREATE_FIELD_INFO  Info;
  645.  
  646.  
  647.     ACPI_FUNCTION_TRACE_PTR (DsCreateBankField, Op);
  648.  
  649.  
  650.     /* First arg is the name of the parent OpRegion (must already exist) */
  651.  
  652.     Arg = Op->Common.Value.Arg;
  653.     if (!RegionNode)
  654.     {
  655.         Status = AcpiNsLookup (WalkState->ScopeInfo, Arg->Common.Value.Name,
  656.                         ACPI_TYPE_REGION, ACPI_IMODE_EXECUTE,
  657.                         ACPI_NS_SEARCH_PARENT, WalkState, &RegionNode);
  658.         if (ACPI_FAILURE (Status))
  659.         {
  660.             ACPI_ERROR_NAMESPACE (Arg->Common.Value.Name, Status);
  661.             return_ACPI_STATUS (Status);
  662.         }
  663.     }
  664.  
  665.     /* Second arg is the Bank Register (Field) (must already exist) */
  666.  
  667.     Arg = Arg->Common.Next;
  668.     Status = AcpiNsLookup (WalkState->ScopeInfo, Arg->Common.Value.String,
  669.                     ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
  670.                     ACPI_NS_SEARCH_PARENT, WalkState, &Info.RegisterNode);
  671.     if (ACPI_FAILURE (Status))
  672.     {
  673.         ACPI_ERROR_NAMESPACE (Arg->Common.Value.String, Status);
  674.         return_ACPI_STATUS (Status);
  675.     }
  676.  
  677.     /*
  678.      * Third arg is the BankValue
  679.      * This arg is a TermArg, not a constant
  680.      * It will be evaluated later, by AcpiDsEvalBankFieldOperands
  681.      */
  682.     Arg = Arg->Common.Next;
  683.  
  684.     /* Fourth arg is the field flags */
  685.  
  686.     Arg = Arg->Common.Next;
  687.     Info.FieldFlags = (UINT8) Arg->Common.Value.Integer;
  688.  
  689.     /* Each remaining arg is a Named Field */
  690.  
  691.     Info.FieldType = ACPI_TYPE_LOCAL_BANK_FIELD;
  692.     Info.RegionNode = RegionNode;
  693.  
  694.     /*
  695.      * Use Info.DataRegisterNode to store BankField Op
  696.      * It's safe because DataRegisterNode will never be used when create bank field
  697.      * We store AmlStart and AmlLength in the BankField Op for late evaluation
  698.      * Used in AcpiExPrepFieldValue(Info)
  699.      *
  700.      * TBD: Or, should we add a field in ACPI_CREATE_FIELD_INFO, like "void *ParentOp"?
  701.      */
  702.     Info.DataRegisterNode = (ACPI_NAMESPACE_NODE*) Op;
  703.  
  704.     Status = AcpiDsGetFieldNames (&Info, WalkState, Arg->Common.Next);
  705.     return_ACPI_STATUS (Status);
  706. }
  707.  
  708.  
  709. /*******************************************************************************
  710.  *
  711.  * FUNCTION:    AcpiDsCreateIndexField
  712.  *
  713.  * PARAMETERS:  Op              - Op containing the Field definition and args
  714.  *              RegionNode      - Object for the containing Operation Region
  715.  *  `           WalkState       - Current method state
  716.  *
  717.  * RETURN:      Status
  718.  *
  719.  * DESCRIPTION: Create a new index field in the specified operation region
  720.  *
  721.  ******************************************************************************/
  722.  
  723. ACPI_STATUS
  724. AcpiDsCreateIndexField (
  725.     ACPI_PARSE_OBJECT       *Op,
  726.     ACPI_NAMESPACE_NODE     *RegionNode,
  727.     ACPI_WALK_STATE         *WalkState)
  728. {
  729.     ACPI_STATUS             Status;
  730.     ACPI_PARSE_OBJECT       *Arg;
  731.     ACPI_CREATE_FIELD_INFO  Info;
  732.  
  733.  
  734.     ACPI_FUNCTION_TRACE_PTR (DsCreateIndexField, Op);
  735.  
  736.  
  737.     /* First arg is the name of the Index register (must already exist) */
  738.  
  739.     Arg = Op->Common.Value.Arg;
  740.     Status = AcpiNsLookup (WalkState->ScopeInfo, Arg->Common.Value.String,
  741.                     ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
  742.                     ACPI_NS_SEARCH_PARENT, WalkState, &Info.RegisterNode);
  743.     if (ACPI_FAILURE (Status))
  744.     {
  745.         ACPI_ERROR_NAMESPACE (Arg->Common.Value.String, Status);
  746.         return_ACPI_STATUS (Status);
  747.     }
  748.  
  749.     /* Second arg is the data register (must already exist) */
  750.  
  751.     Arg = Arg->Common.Next;
  752.     Status = AcpiNsLookup (WalkState->ScopeInfo, Arg->Common.Value.String,
  753.                     ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
  754.                     ACPI_NS_SEARCH_PARENT, WalkState, &Info.DataRegisterNode);
  755.     if (ACPI_FAILURE (Status))
  756.     {
  757.         ACPI_ERROR_NAMESPACE (Arg->Common.Value.String, Status);
  758.         return_ACPI_STATUS (Status);
  759.     }
  760.  
  761.     /* Next arg is the field flags */
  762.  
  763.     Arg = Arg->Common.Next;
  764.     Info.FieldFlags = (UINT8) Arg->Common.Value.Integer;
  765.  
  766.     /* Each remaining arg is a Named Field */
  767.  
  768.     Info.FieldType = ACPI_TYPE_LOCAL_INDEX_FIELD;
  769.     Info.RegionNode = RegionNode;
  770.  
  771.     Status = AcpiDsGetFieldNames (&Info, WalkState, Arg->Common.Next);
  772.  
  773.     return_ACPI_STATUS (Status);
  774. }
  775.  
  776.  
  777.