--- /dev/null
+/******************************************************************************
+ *
+ * Module Name: psparse - Parser top level AML parse routines
+ *
+ *****************************************************************************/
+
+/******************************************************************************
+ *
+ * 1. Copyright Notice
+ *
+ * Some or all of this work - Copyright (c) 1999 - 2009, 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.
+ *
+ *****************************************************************************/
+
+
+/*
+ * Parse the AML and build an operation tree as most interpreters,
+ * like Perl, do. Parsing is done by hand rather than with a YACC
+ * generated parser to tightly constrain stack and dynamic memory
+ * usage. At the same time, parsing is kept flexible and the code
+ * fairly compact by parsing based on a list of AML opcode
+ * templates in AmlOpInfo[]
+ */
+
+#include "acpi.h"
+#include "accommon.h"
+#include "acparser.h"
+#include "acdispat.h"
+#include "amlcode.h"
+#include "acnamesp.h"
+#include "acinterp.h"
+
+#define _COMPONENT ACPI_PARSER
+ ACPI_MODULE_NAME ("psparse")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: AcpiPsGetOpcodeSize
+ *
+ * PARAMETERS: Opcode - An AML opcode
+ *
+ * RETURN: Size of the opcode, in bytes (1 or 2)
+ *
+ * DESCRIPTION: Get the size of the current opcode.
+ *
+ ******************************************************************************/
+
+UINT32
+AcpiPsGetOpcodeSize (
+ UINT32 Opcode)
+{
+
+ /* Extended (2-byte) opcode if > 255 */
+
+ if (Opcode > 0x00FF)
+ {
+ return (2);
+ }
+
+ /* Otherwise, just a single byte opcode */
+
+ return (1);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: AcpiPsPeekOpcode
+ *
+ * PARAMETERS: ParserState - A parser state object
+ *
+ * RETURN: Next AML opcode
+ *
+ * DESCRIPTION: Get next AML opcode (without incrementing AML pointer)
+ *
+ ******************************************************************************/
+
+UINT16
+AcpiPsPeekOpcode (
+ ACPI_PARSE_STATE *ParserState)
+{
+ UINT8 *Aml;
+ UINT16 Opcode;
+
+
+ Aml = ParserState->Aml;
+ Opcode = (UINT16) ACPI_GET8 (Aml);
+
+ if (Opcode == AML_EXTENDED_OP_PREFIX)
+ {
+ /* Extended opcode, get the second opcode byte */
+
+ Aml++;
+ Opcode = (UINT16) ((Opcode << 8) | ACPI_GET8 (Aml));
+ }
+
+ return (Opcode);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: AcpiPsCompleteThisOp
+ *
+ * PARAMETERS: WalkState - Current State
+ * Op - Op to complete
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Perform any cleanup at the completion of an Op.
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiPsCompleteThisOp (
+ ACPI_WALK_STATE *WalkState,
+ ACPI_PARSE_OBJECT *Op)
+{
+ ACPI_PARSE_OBJECT *Prev;
+ ACPI_PARSE_OBJECT *Next;
+ const ACPI_OPCODE_INFO *ParentInfo;
+ ACPI_PARSE_OBJECT *ReplacementOp = NULL;
+ ACPI_STATUS Status = AE_OK;
+
+
+ ACPI_FUNCTION_TRACE_PTR (PsCompleteThisOp, Op);
+
+
+ /* Check for null Op, can happen if AML code is corrupt */
+
+ if (!Op)
+ {
+ return_ACPI_STATUS (AE_OK); /* OK for now */
+ }
+
+ /* Delete this op and the subtree below it if asked to */
+
+ if (((WalkState->ParseFlags & ACPI_PARSE_TREE_MASK) != ACPI_PARSE_DELETE_TREE) ||
+ (WalkState->OpInfo->Class == AML_CLASS_ARGUMENT))
+ {
+ return_ACPI_STATUS (AE_OK);
+ }
+
+ /* Make sure that we only delete this subtree */
+
+ if (Op->Common.Parent)
+ {
+ Prev = Op->Common.Parent->Common.Value.Arg;
+ if (!Prev)
+ {
+ /* Nothing more to do */
+
+ goto Cleanup;
+ }
+
+ /*
+ * Check if we need to replace the operator and its subtree
+ * with a return value op (placeholder op)
+ */
+ ParentInfo = AcpiPsGetOpcodeInfo (Op->Common.Parent->Common.AmlOpcode);
+
+ switch (ParentInfo->Class)
+ {
+ case AML_CLASS_CONTROL:
+ break;
+
+ case AML_CLASS_CREATE:
+
+ /*
+ * These opcodes contain TermArg operands. The current
+ * op must be replaced by a placeholder return op
+ */
+ ReplacementOp = AcpiPsAllocOp (AML_INT_RETURN_VALUE_OP);
+ if (!ReplacementOp)
+ {
+ Status = AE_NO_MEMORY;
+ }
+ break;
+
+ case AML_CLASS_NAMED_OBJECT:
+
+ /*
+ * These opcodes contain TermArg operands. The current
+ * op must be replaced by a placeholder return op
+ */
+ if ((Op->Common.Parent->Common.AmlOpcode == AML_REGION_OP) ||
+ (Op->Common.Parent->Common.AmlOpcode == AML_DATA_REGION_OP) ||
+ (Op->Common.Parent->Common.AmlOpcode == AML_BUFFER_OP) ||
+ (Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
+ (Op->Common.Parent->Common.AmlOpcode == AML_BANK_FIELD_OP) ||
+ (Op->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP))
+ {
+ ReplacementOp = AcpiPsAllocOp (AML_INT_RETURN_VALUE_OP);
+ if (!ReplacementOp)
+ {
+ Status = AE_NO_MEMORY;
+ }
+ }
+ else if ((Op->Common.Parent->Common.AmlOpcode == AML_NAME_OP) &&
+ (WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2))
+ {
+ if ((Op->Common.AmlOpcode == AML_BUFFER_OP) ||
+ (Op->Common.AmlOpcode == AML_PACKAGE_OP) ||
+ (Op->Common.AmlOpcode == AML_VAR_PACKAGE_OP))
+ {
+ ReplacementOp = AcpiPsAllocOp (Op->Common.AmlOpcode);
+ if (!ReplacementOp)
+ {
+ Status = AE_NO_MEMORY;
+ }
+ else
+ {
+ ReplacementOp->Named.Data = Op->Named.Data;
+ ReplacementOp->Named.Length = Op->Named.Length;
+ }
+ }
+ }
+ break;
+
+ default:
+
+ ReplacementOp = AcpiPsAllocOp (AML_INT_RETURN_VALUE_OP);
+ if (!ReplacementOp)
+ {
+ Status = AE_NO_MEMORY;
+ }
+ }
+
+ /* We must unlink this op from the parent tree */
+
+ if (Prev == Op)
+ {
+ /* This op is the first in the list */
+
+ if (ReplacementOp)
+ {
+ ReplacementOp->Common.Parent = Op->Common.Parent;
+ ReplacementOp->Common.Value.Arg = NULL;
+ ReplacementOp->Common.Node = Op->Common.Node;
+ Op->Common.Parent->Common.Value.Arg = ReplacementOp;
+ ReplacementOp->Common.Next = Op->Common.Next;
+ }
+ else
+ {
+ Op->Common.Parent->Common.Value.Arg = Op->Common.Next;
+ }
+ }
+
+ /* Search the parent list */
+
+ else while (Prev)
+ {
+ /* Traverse all siblings in the parent's argument list */
+
+ Next = Prev->Common.Next;
+ if (Next == Op)
+ {
+ if (ReplacementOp)
+ {
+ ReplacementOp->Common.Parent = Op->Common.Parent;
+ ReplacementOp->Common.Value.Arg = NULL;
+ ReplacementOp->Common.Node = Op->Common.Node;
+ Prev->Common.Next = ReplacementOp;
+ ReplacementOp->Common.Next = Op->Common.Next;
+ Next = NULL;
+ }
+ else
+ {
+ Prev->Common.Next = Op->Common.Next;
+ Next = NULL;
+ }
+ }
+ Prev = Next;
+ }
+ }
+
+
+Cleanup:
+
+ /* Now we can actually delete the subtree rooted at Op */
+
+ AcpiPsDeleteParseTree (Op);
+ return_ACPI_STATUS (Status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: AcpiPsNextParseState
+ *
+ * PARAMETERS: WalkState - Current state
+ * Op - Current parse op
+ * CallbackStatus - Status from previous operation
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Update the parser state based upon the return exception from
+ * the parser callback.
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiPsNextParseState (
+ ACPI_WALK_STATE *WalkState,
+ ACPI_PARSE_OBJECT *Op,
+ ACPI_STATUS CallbackStatus)
+{
+ ACPI_PARSE_STATE *ParserState = &WalkState->ParserState;
+ ACPI_STATUS Status = AE_CTRL_PENDING;
+
+
+ ACPI_FUNCTION_TRACE_PTR (PsNextParseState, Op);
+
+
+ switch (CallbackStatus)
+ {
+ case AE_CTRL_TERMINATE:
+ /*
+ * A control method was terminated via a RETURN statement.
+ * The walk of this method is complete.
+ */
+ ParserState->Aml = ParserState->AmlEnd;
+ Status = AE_CTRL_TERMINATE;
+ break;
+
+
+ case AE_CTRL_BREAK:
+
+ ParserState->Aml = WalkState->AmlLastWhile;
+ WalkState->ControlState->Common.Value = FALSE;
+ Status = AE_CTRL_BREAK;
+ break;
+
+
+ case AE_CTRL_CONTINUE:
+
+ ParserState->Aml = WalkState->AmlLastWhile;
+ Status = AE_CTRL_CONTINUE;
+ break;
+
+
+ case AE_CTRL_PENDING:
+
+ ParserState->Aml = WalkState->AmlLastWhile;
+ break;
+
+#if 0
+ case AE_CTRL_SKIP:
+
+ ParserState->Aml = ParserState->Scope->ParseScope.PkgEnd;
+ Status = AE_OK;
+ break;
+#endif
+
+ case AE_CTRL_TRUE:
+ /*
+ * Predicate of an IF was true, and we are at the matching ELSE.
+ * Just close out this package
+ */
+ ParserState->Aml = AcpiPsGetNextPackageEnd (ParserState);
+ Status = AE_CTRL_PENDING;
+ break;
+
+
+ case AE_CTRL_FALSE:
+ /*
+ * Either an IF/WHILE Predicate was false or we encountered a BREAK
+ * opcode. In both cases, we do not execute the rest of the
+ * package; We simply close out the parent (finishing the walk of
+ * this branch of the tree) and continue execution at the parent
+ * level.
+ */
+ ParserState->Aml = ParserState->Scope->ParseScope.PkgEnd;
+
+ /* In the case of a BREAK, just force a predicate (if any) to FALSE */
+
+ WalkState->ControlState->Common.Value = FALSE;
+ Status = AE_CTRL_END;
+ break;
+
+
+ case AE_CTRL_TRANSFER:
+
+ /* A method call (invocation) -- transfer control */
+
+ Status = AE_CTRL_TRANSFER;
+ WalkState->PrevOp = Op;
+ WalkState->MethodCallOp = Op;
+ WalkState->MethodCallNode = (Op->Common.Value.Arg)->Common.Node;
+
+ /* Will return value (if any) be used by the caller? */
+
+ WalkState->ReturnUsed = AcpiDsIsResultUsed (Op, WalkState);
+ break;
+
+
+ default:
+
+ Status = CallbackStatus;
+ if ((CallbackStatus & AE_CODE_MASK) == AE_CODE_CONTROL)
+ {
+ Status = AE_OK;
+ }
+ break;
+ }
+
+ return_ACPI_STATUS (Status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: AcpiPsParseAml
+ *
+ * PARAMETERS: WalkState - Current state
+ *
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Parse raw AML and return a tree of ops
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+AcpiPsParseAml (
+ ACPI_WALK_STATE *WalkState)
+{
+ ACPI_STATUS Status;
+ ACPI_THREAD_STATE *Thread;
+ ACPI_THREAD_STATE *PrevWalkList = AcpiGbl_CurrentWalkList;
+ ACPI_WALK_STATE *PreviousWalkState;
+
+
+ ACPI_FUNCTION_TRACE (PsParseAml);
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
+ "Entered with WalkState=%p Aml=%p size=%X\n",
+ WalkState, WalkState->ParserState.Aml,
+ WalkState->ParserState.AmlSize));
+
+ if (!WalkState->ParserState.Aml)
+ {
+ return_ACPI_STATUS (AE_NULL_OBJECT);
+ }
+
+ /* Create and initialize a new thread state */
+
+ Thread = AcpiUtCreateThreadState ();
+ if (!Thread)
+ {
+ if (WalkState->MethodDesc)
+ {
+ /* Executing a control method - additional cleanup */
+
+ AcpiDsTerminateControlMethod (WalkState->MethodDesc, WalkState);
+ }
+
+ AcpiDsDeleteWalkState (WalkState);
+ return_ACPI_STATUS (AE_NO_MEMORY);
+ }
+
+ WalkState->Thread = Thread;
+
+ /*
+ * If executing a method, the starting SyncLevel is this method's
+ * SyncLevel
+ */
+ if (WalkState->MethodDesc)
+ {
+ WalkState->Thread->CurrentSyncLevel = WalkState->MethodDesc->Method.SyncLevel;
+ }
+
+ AcpiDsPushWalkState (WalkState, Thread);
+
+ /*
+ * This global allows the AML debugger to get a handle to the currently
+ * executing control method.
+ */
+ AcpiGbl_CurrentWalkList = Thread;
+
+ /*
+ * Execute the walk loop as long as there is a valid Walk State. This
+ * handles nested control method invocations without recursion.
+ */
+ ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "State=%p\n", WalkState));
+
+ Status = AE_OK;
+ while (WalkState)
+ {
+ if (ACPI_SUCCESS (Status))
+ {
+ /*
+ * The ParseLoop executes AML until the method terminates
+ * or calls another method.
+ */
+ Status = AcpiPsParseLoop (WalkState);
+ }
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
+ "Completed one call to walk loop, %s State=%p\n",
+ AcpiFormatException (Status), WalkState));
+
+ if (Status == AE_CTRL_TRANSFER)
+ {
+ /*
+ * A method call was detected.
+ * Transfer control to the called control method
+ */
+ Status = AcpiDsCallControlMethod (Thread, WalkState, NULL);
+ if (ACPI_FAILURE (Status))
+ {
+ Status = AcpiDsMethodError (Status, WalkState);
+ }
+
+ /*
+ * If the transfer to the new method method call worked, a new walk
+ * state was created -- get it
+ */
+ WalkState = AcpiDsGetCurrentWalkState (Thread);
+ continue;
+ }
+ else if (Status == AE_CTRL_TERMINATE)
+ {
+ Status = AE_OK;
+ }
+ else if ((Status != AE_OK) && (WalkState->MethodDesc))
+ {
+ /* Either the method parse or actual execution failed */
+
+ ACPI_ERROR_METHOD ("Method parse/execution failed",
+ WalkState->MethodNode, NULL, Status);
+
+ /* Check for possible multi-thread reentrancy problem */
+
+ if ((Status == AE_ALREADY_EXISTS) &&
+ (!WalkState->MethodDesc->Method.Mutex))
+ {
+ ACPI_INFO ((AE_INFO,
+ "Marking method %4.4s as Serialized because of AE_ALREADY_EXISTS error",
+ WalkState->MethodNode->Name.Ascii));
+
+ /*
+ * Method tried to create an object twice. The probable cause is
+ * that the method cannot handle reentrancy.
+ *
+ * The method is marked NotSerialized, but it tried to create
+ * a named object, causing the second thread entrance to fail.
+ * Workaround this problem by marking the method permanently
+ * as Serialized.
+ */
+ WalkState->MethodDesc->Method.MethodFlags |= AML_METHOD_SERIALIZED;
+ WalkState->MethodDesc->Method.SyncLevel = 0;
+ }
+ }
+
+ /* We are done with this walk, move on to the parent if any */
+
+ WalkState = AcpiDsPopWalkState (Thread);
+
+ /* Reset the current scope to the beginning of scope stack */
+
+ AcpiDsScopeStackClear (WalkState);
+
+ /*
+ * If we just returned from the execution of a control method or if we
+ * encountered an error during the method parse phase, there's lots of
+ * cleanup to do
+ */
+ if (((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) == ACPI_PARSE_EXECUTE) ||
+ (ACPI_FAILURE (Status)))
+ {
+ AcpiDsTerminateControlMethod (WalkState->MethodDesc, WalkState);
+ }
+
+ /* Delete this walk state and all linked control states */
+
+ AcpiPsCleanupScope (&WalkState->ParserState);
+ PreviousWalkState = WalkState;
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
+ "ReturnValue=%p, ImplicitValue=%p State=%p\n",
+ WalkState->ReturnDesc, WalkState->ImplicitReturnObj, WalkState));
+
+ /* Check if we have restarted a preempted walk */
+
+ WalkState = AcpiDsGetCurrentWalkState (Thread);
+ if (WalkState)
+ {
+ if (ACPI_SUCCESS (Status))
+ {
+ /*
+ * There is another walk state, restart it.
+ * If the method return value is not used by the parent,
+ * The object is deleted
+ */
+ if (!PreviousWalkState->ReturnDesc)
+ {
+ /*
+ * In slack mode execution, if there is no return value
+ * we should implicitly return zero (0) as a default value.
+ */
+ if (AcpiGbl_EnableInterpreterSlack &&
+ !PreviousWalkState->ImplicitReturnObj)
+ {
+ PreviousWalkState->ImplicitReturnObj =
+ AcpiUtCreateIntegerObject ((UINT64) 0);
+ if (!PreviousWalkState->ImplicitReturnObj)
+ {
+ return_ACPI_STATUS (AE_NO_MEMORY);
+ }
+ }
+
+ /* Restart the calling control method */
+
+ Status = AcpiDsRestartControlMethod (WalkState,
+ PreviousWalkState->ImplicitReturnObj);
+ }
+ else
+ {
+ /*
+ * We have a valid return value, delete any implicit
+ * return value.
+ */
+ AcpiDsClearImplicitReturn (PreviousWalkState);
+
+ Status = AcpiDsRestartControlMethod (WalkState,
+ PreviousWalkState->ReturnDesc);
+ }
+ if (ACPI_SUCCESS (Status))
+ {
+ WalkState->WalkType |= ACPI_WALK_METHOD_RESTART;
+ }
+ }
+ else
+ {
+ /* On error, delete any return object or implicit return */
+
+ AcpiUtRemoveReference (PreviousWalkState->ReturnDesc);
+ AcpiDsClearImplicitReturn (PreviousWalkState);
+ }
+ }
+
+ /*
+ * Just completed a 1st-level method, save the final internal return
+ * value (if any)
+ */
+ else if (PreviousWalkState->CallerReturnDesc)
+ {
+ if (PreviousWalkState->ImplicitReturnObj)
+ {
+ *(PreviousWalkState->CallerReturnDesc) =
+ PreviousWalkState->ImplicitReturnObj;
+ }
+ else
+ {
+ /* NULL if no return value */
+
+ *(PreviousWalkState->CallerReturnDesc) =
+ PreviousWalkState->ReturnDesc;
+ }
+ }
+ else
+ {
+ if (PreviousWalkState->ReturnDesc)
+ {
+ /* Caller doesn't want it, must delete it */
+
+ AcpiUtRemoveReference (PreviousWalkState->ReturnDesc);
+ }
+ if (PreviousWalkState->ImplicitReturnObj)
+ {
+ /* Caller doesn't want it, must delete it */
+
+ AcpiUtRemoveReference (PreviousWalkState->ImplicitReturnObj);
+ }
+ }
+
+ AcpiDsDeleteWalkState (PreviousWalkState);
+ }
+
+ /* Normal exit */
+
+ AcpiExReleaseAllMutexes (Thread);
+ AcpiUtDeleteGenericState (ACPI_CAST_PTR (ACPI_GENERIC_STATE, Thread));
+ AcpiGbl_CurrentWalkList = PrevWalkList;
+ return_ACPI_STATUS (Status);
+}
+
+
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