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  1. /*******************************************************************************
  2.  *
  3.  * Module Name: dsmthdat - control method arguments and local variables
  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 __DSMTHDAT_C__
  117.  
  118. #include "acpi.h"
  119. #include "accommon.h"
  120. #include "acdispat.h"
  121. #include "acnamesp.h"
  122. #include "acinterp.h"
  123.  
  124.  
  125. #define _COMPONENT          ACPI_DISPATCHER
  126.         ACPI_MODULE_NAME    ("dsmthdat")
  127.  
  128. /* Local prototypes */
  129.  
  130. static void
  131. AcpiDsMethodDataDeleteValue (
  132.     UINT8                   Type,
  133.     UINT32                  Index,
  134.     ACPI_WALK_STATE         *WalkState);
  135.  
  136. static ACPI_STATUS
  137. AcpiDsMethodDataSetValue (
  138.     UINT8                   Type,
  139.     UINT32                  Index,
  140.     ACPI_OPERAND_OBJECT     *Object,
  141.     ACPI_WALK_STATE         *WalkState);
  142.  
  143. #ifdef ACPI_OBSOLETE_FUNCTIONS
  144. ACPI_OBJECT_TYPE
  145. AcpiDsMethodDataGetType (
  146.     UINT16                  Opcode,
  147.     UINT32                  Index,
  148.     ACPI_WALK_STATE         *WalkState);
  149. #endif
  150.  
  151.  
  152. /*******************************************************************************
  153.  *
  154.  * FUNCTION:    AcpiDsMethodDataInit
  155.  *
  156.  * PARAMETERS:  WalkState           - Current walk state object
  157.  *
  158.  * RETURN:      Status
  159.  *
  160.  * DESCRIPTION: Initialize the data structures that hold the method's arguments
  161.  *              and locals.  The data struct is an array of namespace nodes for
  162.  *              each - this allows RefOf and DeRefOf to work properly for these
  163.  *              special data types.
  164.  *
  165.  * NOTES:       WalkState fields are initialized to zero by the
  166.  *              ACPI_ALLOCATE_ZEROED().
  167.  *
  168.  *              A pseudo-Namespace Node is assigned to each argument and local
  169.  *              so that RefOf() can return a pointer to the Node.
  170.  *
  171.  ******************************************************************************/
  172.  
  173. void
  174. AcpiDsMethodDataInit (
  175.     ACPI_WALK_STATE         *WalkState)
  176. {
  177.     UINT32                  i;
  178.  
  179.  
  180.     ACPI_FUNCTION_TRACE (DsMethodDataInit);
  181.  
  182.  
  183.     /* Init the method arguments */
  184.  
  185.     for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++)
  186.     {
  187.         ACPI_MOVE_32_TO_32 (&WalkState->Arguments[i].Name, NAMEOF_ARG_NTE);
  188.         WalkState->Arguments[i].Name.Integer |= (i << 24);
  189.         WalkState->Arguments[i].DescriptorType = ACPI_DESC_TYPE_NAMED;
  190.         WalkState->Arguments[i].Type = ACPI_TYPE_ANY;
  191.         WalkState->Arguments[i].Flags = ANOBJ_METHOD_ARG;
  192.     }
  193.  
  194.     /* Init the method locals */
  195.  
  196.     for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++)
  197.     {
  198.         ACPI_MOVE_32_TO_32 (&WalkState->LocalVariables[i].Name, NAMEOF_LOCAL_NTE);
  199.  
  200.         WalkState->LocalVariables[i].Name.Integer |= (i << 24);
  201.         WalkState->LocalVariables[i].DescriptorType = ACPI_DESC_TYPE_NAMED;
  202.         WalkState->LocalVariables[i].Type = ACPI_TYPE_ANY;
  203.         WalkState->LocalVariables[i].Flags = ANOBJ_METHOD_LOCAL;
  204.     }
  205.  
  206.     return_VOID;
  207. }
  208.  
  209.  
  210. /*******************************************************************************
  211.  *
  212.  * FUNCTION:    AcpiDsMethodDataDeleteAll
  213.  *
  214.  * PARAMETERS:  WalkState           - Current walk state object
  215.  *
  216.  * RETURN:      None
  217.  *
  218.  * DESCRIPTION: Delete method locals and arguments.  Arguments are only
  219.  *              deleted if this method was called from another method.
  220.  *
  221.  ******************************************************************************/
  222.  
  223. void
  224. AcpiDsMethodDataDeleteAll (
  225.     ACPI_WALK_STATE         *WalkState)
  226. {
  227.     UINT32                  Index;
  228.  
  229.  
  230.     ACPI_FUNCTION_TRACE (DsMethodDataDeleteAll);
  231.  
  232.  
  233.     /* Detach the locals */
  234.  
  235.     for (Index = 0; Index < ACPI_METHOD_NUM_LOCALS; Index++)
  236.     {
  237.         if (WalkState->LocalVariables[Index].Object)
  238.         {
  239.             ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%u=%p\n",
  240.                     Index, WalkState->LocalVariables[Index].Object));
  241.  
  242.             /* Detach object (if present) and remove a reference */
  243.  
  244.             AcpiNsDetachObject (&WalkState->LocalVariables[Index]);
  245.         }
  246.     }
  247.  
  248.     /* Detach the arguments */
  249.  
  250.     for (Index = 0; Index < ACPI_METHOD_NUM_ARGS; Index++)
  251.     {
  252.         if (WalkState->Arguments[Index].Object)
  253.         {
  254.             ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%u=%p\n",
  255.                     Index, WalkState->Arguments[Index].Object));
  256.  
  257.             /* Detach object (if present) and remove a reference */
  258.  
  259.             AcpiNsDetachObject (&WalkState->Arguments[Index]);
  260.         }
  261.     }
  262.  
  263.     return_VOID;
  264. }
  265.  
  266.  
  267. /*******************************************************************************
  268.  *
  269.  * FUNCTION:    AcpiDsMethodDataInitArgs
  270.  *
  271.  * PARAMETERS:  *Params         - Pointer to a parameter list for the method
  272.  *              MaxParamCount   - The arg count for this method
  273.  *              WalkState       - Current walk state object
  274.  *
  275.  * RETURN:      Status
  276.  *
  277.  * DESCRIPTION: Initialize arguments for a method.  The parameter list is a list
  278.  *              of ACPI operand objects, either null terminated or whose length
  279.  *              is defined by MaxParamCount.
  280.  *
  281.  ******************************************************************************/
  282.  
  283. ACPI_STATUS
  284. AcpiDsMethodDataInitArgs (
  285.     ACPI_OPERAND_OBJECT     **Params,
  286.     UINT32                  MaxParamCount,
  287.     ACPI_WALK_STATE         *WalkState)
  288. {
  289.     ACPI_STATUS             Status;
  290.     UINT32                  Index = 0;
  291.  
  292.  
  293.     ACPI_FUNCTION_TRACE_PTR (DsMethodDataInitArgs, Params);
  294.  
  295.  
  296.     if (!Params)
  297.     {
  298.         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "No param list passed to method\n"));
  299.         return_ACPI_STATUS (AE_OK);
  300.     }
  301.  
  302.     /* Copy passed parameters into the new method stack frame */
  303.  
  304.     while ((Index < ACPI_METHOD_NUM_ARGS) &&
  305.            (Index < MaxParamCount)        &&
  306.             Params[Index])
  307.     {
  308.         /*
  309.          * A valid parameter.
  310.          * Store the argument in the method/walk descriptor.
  311.          * Do not copy the arg in order to implement call by reference
  312.          */
  313.         Status = AcpiDsMethodDataSetValue (ACPI_REFCLASS_ARG, Index,
  314.                     Params[Index], WalkState);
  315.         if (ACPI_FAILURE (Status))
  316.         {
  317.             return_ACPI_STATUS (Status);
  318.         }
  319.  
  320.         Index++;
  321.     }
  322.  
  323.     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%u args passed to method\n", Index));
  324.     return_ACPI_STATUS (AE_OK);
  325. }
  326.  
  327.  
  328. /*******************************************************************************
  329.  *
  330.  * FUNCTION:    AcpiDsMethodDataGetNode
  331.  *
  332.  * PARAMETERS:  Type                - Either ACPI_REFCLASS_LOCAL or
  333.  *                                    ACPI_REFCLASS_ARG
  334.  *              Index               - Which Local or Arg whose type to get
  335.  *              WalkState           - Current walk state object
  336.  *              Node                - Where the node is returned.
  337.  *
  338.  * RETURN:      Status and node
  339.  *
  340.  * DESCRIPTION: Get the Node associated with a local or arg.
  341.  *
  342.  ******************************************************************************/
  343.  
  344. ACPI_STATUS
  345. AcpiDsMethodDataGetNode (
  346.     UINT8                   Type,
  347.     UINT32                  Index,
  348.     ACPI_WALK_STATE         *WalkState,
  349.     ACPI_NAMESPACE_NODE     **Node)
  350. {
  351.     ACPI_FUNCTION_TRACE (DsMethodDataGetNode);
  352.  
  353.  
  354.     /*
  355.      * Method Locals and Arguments are supported
  356.      */
  357.     switch (Type)
  358.     {
  359.     case ACPI_REFCLASS_LOCAL:
  360.  
  361.         if (Index > ACPI_METHOD_MAX_LOCAL)
  362.         {
  363.             ACPI_ERROR ((AE_INFO,
  364.                 "Local index %u is invalid (max %u)",
  365.                 Index, ACPI_METHOD_MAX_LOCAL));
  366.             return_ACPI_STATUS (AE_AML_INVALID_INDEX);
  367.         }
  368.  
  369.         /* Return a pointer to the pseudo-node */
  370.  
  371.         *Node = &WalkState->LocalVariables[Index];
  372.         break;
  373.  
  374.     case ACPI_REFCLASS_ARG:
  375.  
  376.         if (Index > ACPI_METHOD_MAX_ARG)
  377.         {
  378.             ACPI_ERROR ((AE_INFO,
  379.                 "Arg index %u is invalid (max %u)",
  380.                 Index, ACPI_METHOD_MAX_ARG));
  381.             return_ACPI_STATUS (AE_AML_INVALID_INDEX);
  382.         }
  383.  
  384.         /* Return a pointer to the pseudo-node */
  385.  
  386.         *Node = &WalkState->Arguments[Index];
  387.         break;
  388.  
  389.     default:
  390.         ACPI_ERROR ((AE_INFO, "Type %u is invalid", Type));
  391.         return_ACPI_STATUS (AE_TYPE);
  392.     }
  393.  
  394.     return_ACPI_STATUS (AE_OK);
  395. }
  396.  
  397.  
  398. /*******************************************************************************
  399.  *
  400.  * FUNCTION:    AcpiDsMethodDataSetValue
  401.  *
  402.  * PARAMETERS:  Type                - Either ACPI_REFCLASS_LOCAL or
  403.  *                                    ACPI_REFCLASS_ARG
  404.  *              Index               - Which Local or Arg to get
  405.  *              Object              - Object to be inserted into the stack entry
  406.  *              WalkState           - Current walk state object
  407.  *
  408.  * RETURN:      Status
  409.  *
  410.  * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index.
  411.  *              Note: There is no "implicit conversion" for locals.
  412.  *
  413.  ******************************************************************************/
  414.  
  415. static ACPI_STATUS
  416. AcpiDsMethodDataSetValue (
  417.     UINT8                   Type,
  418.     UINT32                  Index,
  419.     ACPI_OPERAND_OBJECT     *Object,
  420.     ACPI_WALK_STATE         *WalkState)
  421. {
  422.     ACPI_STATUS             Status;
  423.     ACPI_NAMESPACE_NODE     *Node;
  424.  
  425.  
  426.     ACPI_FUNCTION_TRACE (DsMethodDataSetValue);
  427.  
  428.  
  429.     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
  430.         "NewObj %p Type %2.2X, Refs=%u [%s]\n", Object,
  431.         Type, Object->Common.ReferenceCount,
  432.         AcpiUtGetTypeName (Object->Common.Type)));
  433.  
  434.     /* Get the namespace node for the arg/local */
  435.  
  436.     Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
  437.     if (ACPI_FAILURE (Status))
  438.     {
  439.         return_ACPI_STATUS (Status);
  440.     }
  441.  
  442.     /*
  443.      * Increment ref count so object can't be deleted while installed.
  444.      * NOTE: We do not copy the object in order to preserve the call by
  445.      * reference semantics of ACPI Control Method invocation.
  446.      * (See ACPI Specification 2.0C)
  447.      */
  448.     AcpiUtAddReference (Object);
  449.  
  450.     /* Install the object */
  451.  
  452.     Node->Object = Object;
  453.     return_ACPI_STATUS (Status);
  454. }
  455.  
  456.  
  457. /*******************************************************************************
  458.  *
  459.  * FUNCTION:    AcpiDsMethodDataGetValue
  460.  *
  461.  * PARAMETERS:  Type                - Either ACPI_REFCLASS_LOCAL or
  462.  *                                    ACPI_REFCLASS_ARG
  463.  *              Index               - Which localVar or argument to get
  464.  *              WalkState           - Current walk state object
  465.  *              DestDesc            - Where Arg or Local value is returned
  466.  *
  467.  * RETURN:      Status
  468.  *
  469.  * DESCRIPTION: Retrieve value of selected Arg or Local for this method
  470.  *              Used only in AcpiExResolveToValue().
  471.  *
  472.  ******************************************************************************/
  473.  
  474. ACPI_STATUS
  475. AcpiDsMethodDataGetValue (
  476.     UINT8                   Type,
  477.     UINT32                  Index,
  478.     ACPI_WALK_STATE         *WalkState,
  479.     ACPI_OPERAND_OBJECT     **DestDesc)
  480. {
  481.     ACPI_STATUS             Status;
  482.     ACPI_NAMESPACE_NODE     *Node;
  483.     ACPI_OPERAND_OBJECT     *Object;
  484.  
  485.  
  486.     ACPI_FUNCTION_TRACE (DsMethodDataGetValue);
  487.  
  488.  
  489.     /* Validate the object descriptor */
  490.  
  491.     if (!DestDesc)
  492.     {
  493.         ACPI_ERROR ((AE_INFO, "Null object descriptor pointer"));
  494.         return_ACPI_STATUS (AE_BAD_PARAMETER);
  495.     }
  496.  
  497.     /* Get the namespace node for the arg/local */
  498.  
  499.     Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
  500.     if (ACPI_FAILURE (Status))
  501.     {
  502.         return_ACPI_STATUS (Status);
  503.     }
  504.  
  505.     /* Get the object from the node */
  506.  
  507.     Object = Node->Object;
  508.  
  509.     /* Examine the returned object, it must be valid. */
  510.  
  511.     if (!Object)
  512.     {
  513.         /*
  514.          * Index points to uninitialized object.
  515.          * This means that either 1) The expected argument was
  516.          * not passed to the method, or 2) A local variable
  517.          * was referenced by the method (via the ASL)
  518.          * before it was initialized.  Either case is an error.
  519.          */
  520.  
  521.         /* If slack enabled, init the LocalX/ArgX to an Integer of value zero */
  522.  
  523.         if (AcpiGbl_EnableInterpreterSlack)
  524.         {
  525.             Object = AcpiUtCreateIntegerObject ((UINT64) 0);
  526.             if (!Object)
  527.             {
  528.                 return_ACPI_STATUS (AE_NO_MEMORY);
  529.             }
  530.  
  531.             Node->Object = Object;
  532.         }
  533.  
  534.         /* Otherwise, return the error */
  535.  
  536.         else switch (Type)
  537.         {
  538.         case ACPI_REFCLASS_ARG:
  539.  
  540.             ACPI_ERROR ((AE_INFO,
  541.                 "Uninitialized Arg[%u] at node %p",
  542.                 Index, Node));
  543.  
  544.             return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG);
  545.  
  546.         case ACPI_REFCLASS_LOCAL:
  547.  
  548.             /*
  549.              * No error message for this case, will be trapped again later to
  550.              * detect and ignore cases of Store(LocalX,LocalX)
  551.              */
  552.             return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL);
  553.  
  554.         default:
  555.  
  556.             ACPI_ERROR ((AE_INFO, "Not a Arg/Local opcode: 0x%X", Type));
  557.             return_ACPI_STATUS (AE_AML_INTERNAL);
  558.         }
  559.     }
  560.  
  561.     /*
  562.      * The Index points to an initialized and valid object.
  563.      * Return an additional reference to the object
  564.      */
  565.     *DestDesc = Object;
  566.     AcpiUtAddReference (Object);
  567.  
  568.     return_ACPI_STATUS (AE_OK);
  569. }
  570.  
  571.  
  572. /*******************************************************************************
  573.  *
  574.  * FUNCTION:    AcpiDsMethodDataDeleteValue
  575.  *
  576.  * PARAMETERS:  Type                - Either ACPI_REFCLASS_LOCAL or
  577.  *                                    ACPI_REFCLASS_ARG
  578.  *              Index               - Which localVar or argument to delete
  579.  *              WalkState           - Current walk state object
  580.  *
  581.  * RETURN:      None
  582.  *
  583.  * DESCRIPTION: Delete the entry at Opcode:Index.  Inserts
  584.  *              a null into the stack slot after the object is deleted.
  585.  *
  586.  ******************************************************************************/
  587.  
  588. static void
  589. AcpiDsMethodDataDeleteValue (
  590.     UINT8                   Type,
  591.     UINT32                  Index,
  592.     ACPI_WALK_STATE         *WalkState)
  593. {
  594.     ACPI_STATUS             Status;
  595.     ACPI_NAMESPACE_NODE     *Node;
  596.     ACPI_OPERAND_OBJECT     *Object;
  597.  
  598.  
  599.     ACPI_FUNCTION_TRACE (DsMethodDataDeleteValue);
  600.  
  601.  
  602.     /* Get the namespace node for the arg/local */
  603.  
  604.     Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
  605.     if (ACPI_FAILURE (Status))
  606.     {
  607.         return_VOID;
  608.     }
  609.  
  610.     /* Get the associated object */
  611.  
  612.     Object = AcpiNsGetAttachedObject (Node);
  613.  
  614.     /*
  615.      * Undefine the Arg or Local by setting its descriptor
  616.      * pointer to NULL. Locals/Args can contain both
  617.      * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs
  618.      */
  619.     Node->Object = NULL;
  620.  
  621.     if ((Object) &&
  622.         (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_OPERAND))
  623.     {
  624.         /*
  625.          * There is a valid object.
  626.          * Decrement the reference count by one to balance the
  627.          * increment when the object was stored.
  628.          */
  629.         AcpiUtRemoveReference (Object);
  630.     }
  631.  
  632.     return_VOID;
  633. }
  634.  
  635.  
  636. /*******************************************************************************
  637.  *
  638.  * FUNCTION:    AcpiDsStoreObjectToLocal
  639.  *
  640.  * PARAMETERS:  Type                - Either ACPI_REFCLASS_LOCAL or
  641.  *                                    ACPI_REFCLASS_ARG
  642.  *              Index               - Which Local or Arg to set
  643.  *              ObjDesc             - Value to be stored
  644.  *              WalkState           - Current walk state
  645.  *
  646.  * RETURN:      Status
  647.  *
  648.  * DESCRIPTION: Store a value in an Arg or Local.  The ObjDesc is installed
  649.  *              as the new value for the Arg or Local and the reference count
  650.  *              for ObjDesc is incremented.
  651.  *
  652.  ******************************************************************************/
  653.  
  654. ACPI_STATUS
  655. AcpiDsStoreObjectToLocal (
  656.     UINT8                   Type,
  657.     UINT32                  Index,
  658.     ACPI_OPERAND_OBJECT     *ObjDesc,
  659.     ACPI_WALK_STATE         *WalkState)
  660. {
  661.     ACPI_STATUS             Status;
  662.     ACPI_NAMESPACE_NODE     *Node;
  663.     ACPI_OPERAND_OBJECT     *CurrentObjDesc;
  664.     ACPI_OPERAND_OBJECT     *NewObjDesc;
  665.  
  666.  
  667.     ACPI_FUNCTION_TRACE (DsStoreObjectToLocal);
  668.     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Type=%2.2X Index=%u Obj=%p\n",
  669.         Type, Index, ObjDesc));
  670.  
  671.     /* Parameter validation */
  672.  
  673.     if (!ObjDesc)
  674.     {
  675.         return_ACPI_STATUS (AE_BAD_PARAMETER);
  676.     }
  677.  
  678.     /* Get the namespace node for the arg/local */
  679.  
  680.     Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
  681.     if (ACPI_FAILURE (Status))
  682.     {
  683.         return_ACPI_STATUS (Status);
  684.     }
  685.  
  686.     CurrentObjDesc = AcpiNsGetAttachedObject (Node);
  687.     if (CurrentObjDesc == ObjDesc)
  688.     {
  689.         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p already installed!\n",
  690.             ObjDesc));
  691.         return_ACPI_STATUS (Status);
  692.     }
  693.  
  694.     /*
  695.      * If the reference count on the object is more than one, we must
  696.      * take a copy of the object before we store.  A reference count
  697.      * of exactly 1 means that the object was just created during the
  698.      * evaluation of an expression, and we can safely use it since it
  699.      * is not used anywhere else.
  700.      */
  701.     NewObjDesc = ObjDesc;
  702.     if (ObjDesc->Common.ReferenceCount > 1)
  703.     {
  704.         Status = AcpiUtCopyIobjectToIobject (ObjDesc, &NewObjDesc, WalkState);
  705.         if (ACPI_FAILURE (Status))
  706.         {
  707.             return_ACPI_STATUS (Status);
  708.         }
  709.     }
  710.  
  711.     /*
  712.      * If there is an object already in this slot, we either
  713.      * have to delete it, or if this is an argument and there
  714.      * is an object reference stored there, we have to do
  715.      * an indirect store!
  716.      */
  717.     if (CurrentObjDesc)
  718.     {
  719.         /*
  720.          * Check for an indirect store if an argument
  721.          * contains an object reference (stored as an Node).
  722.          * We don't allow this automatic dereferencing for
  723.          * locals, since a store to a local should overwrite
  724.          * anything there, including an object reference.
  725.          *
  726.          * If both Arg0 and Local0 contain RefOf (Local4):
  727.          *
  728.          * Store (1, Arg0)             - Causes indirect store to local4
  729.          * Store (1, Local0)           - Stores 1 in local0, overwriting
  730.          *                                  the reference to local4
  731.          * Store (1, DeRefof (Local0)) - Causes indirect store to local4
  732.          *
  733.          * Weird, but true.
  734.          */
  735.         if (Type == ACPI_REFCLASS_ARG)
  736.         {
  737.             /*
  738.              * If we have a valid reference object that came from RefOf(),
  739.              * do the indirect store
  740.              */
  741.             if ((ACPI_GET_DESCRIPTOR_TYPE (CurrentObjDesc) == ACPI_DESC_TYPE_OPERAND) &&
  742.                 (CurrentObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
  743.                 (CurrentObjDesc->Reference.Class == ACPI_REFCLASS_REFOF))
  744.             {
  745.                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
  746.                         "Arg (%p) is an ObjRef(Node), storing in node %p\n",
  747.                         NewObjDesc, CurrentObjDesc));
  748.  
  749.                 /*
  750.                  * Store this object to the Node (perform the indirect store)
  751.                  * NOTE: No implicit conversion is performed, as per the ACPI
  752.                  * specification rules on storing to Locals/Args.
  753.                  */
  754.                 Status = AcpiExStoreObjectToNode (NewObjDesc,
  755.                             CurrentObjDesc->Reference.Object, WalkState,
  756.                             ACPI_NO_IMPLICIT_CONVERSION);
  757.  
  758.                 /* Remove local reference if we copied the object above */
  759.  
  760.                 if (NewObjDesc != ObjDesc)
  761.                 {
  762.                     AcpiUtRemoveReference (NewObjDesc);
  763.                 }
  764.                 return_ACPI_STATUS (Status);
  765.             }
  766.         }
  767.  
  768.         /* Delete the existing object before storing the new one */
  769.  
  770.         AcpiDsMethodDataDeleteValue (Type, Index, WalkState);
  771.     }
  772.  
  773.     /*
  774.      * Install the Obj descriptor (*NewObjDesc) into
  775.      * the descriptor for the Arg or Local.
  776.      * (increments the object reference count by one)
  777.      */
  778.     Status = AcpiDsMethodDataSetValue (Type, Index, NewObjDesc, WalkState);
  779.  
  780.     /* Remove local reference if we copied the object above */
  781.  
  782.     if (NewObjDesc != ObjDesc)
  783.     {
  784.         AcpiUtRemoveReference (NewObjDesc);
  785.     }
  786.  
  787.     return_ACPI_STATUS (Status);
  788. }
  789.  
  790.  
  791. #ifdef ACPI_OBSOLETE_FUNCTIONS
  792. /*******************************************************************************
  793.  *
  794.  * FUNCTION:    AcpiDsMethodDataGetType
  795.  *
  796.  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
  797.  *              Index               - Which Local or Arg whose type to get
  798.  *              WalkState           - Current walk state object
  799.  *
  800.  * RETURN:      Data type of current value of the selected Arg or Local
  801.  *
  802.  * DESCRIPTION: Get the type of the object stored in the Local or Arg
  803.  *
  804.  ******************************************************************************/
  805.  
  806. ACPI_OBJECT_TYPE
  807. AcpiDsMethodDataGetType (
  808.     UINT16                  Opcode,
  809.     UINT32                  Index,
  810.     ACPI_WALK_STATE         *WalkState)
  811. {
  812.     ACPI_STATUS             Status;
  813.     ACPI_NAMESPACE_NODE     *Node;
  814.     ACPI_OPERAND_OBJECT     *Object;
  815.  
  816.  
  817.     ACPI_FUNCTION_TRACE (DsMethodDataGetType);
  818.  
  819.  
  820.     /* Get the namespace node for the arg/local */
  821.  
  822.     Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node);
  823.     if (ACPI_FAILURE (Status))
  824.     {
  825.         return_VALUE ((ACPI_TYPE_NOT_FOUND));
  826.     }
  827.  
  828.     /* Get the object */
  829.  
  830.     Object = AcpiNsGetAttachedObject (Node);
  831.     if (!Object)
  832.     {
  833.         /* Uninitialized local/arg, return TYPE_ANY */
  834.  
  835.         return_VALUE (ACPI_TYPE_ANY);
  836.     }
  837.  
  838.     /* Get the object type */
  839.  
  840.     return_VALUE (Object->Type);
  841. }
  842. #endif
  843.  
  844.  
  845.