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 /*******************************************************************************
  *
  * Module Name: utstate - state object support procedures
  *
  ******************************************************************************/
 
 /******************************************************************************
  *
  * 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.
  *
  *****************************************************************************/
 
 
 #define __UTSTATE_C__
 
 #include "acpi.h"
 #include "accommon.h"
 
 #define _COMPONENT          ACPI_UTILITIES
         ACPI_MODULE_NAME    ("utstate")
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtCreatePkgStateAndPush
  *
  * PARAMETERS:  Object          - Object to be added to the new state
  *              Action          - Increment/Decrement
  *              StateList       - List the state will be added to
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Create a new state and push it
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiUtCreatePkgStateAndPush (
     void                    *InternalObject,
     void                    *ExternalObject,
     UINT16                  Index,
     ACPI_GENERIC_STATE      **StateList)
 {
     ACPI_GENERIC_STATE       *State;
 
 
     ACPI_FUNCTION_ENTRY ();
 
 
     State = AcpiUtCreatePkgState (InternalObject, ExternalObject, Index);
     if (!State)
     {
         return (AE_NO_MEMORY);
     }
 
     AcpiUtPushGenericState (StateList, State);
     return (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtPushGenericState
  *
  * PARAMETERS:  ListHead            - Head of the state stack
  *              State               - State object to push
  *
  * RETURN:      None
  *
  * DESCRIPTION: Push a state object onto a state stack
  *
  ******************************************************************************/
 
 void
 AcpiUtPushGenericState (
     ACPI_GENERIC_STATE      **ListHead,
     ACPI_GENERIC_STATE      *State)
 {
     ACPI_FUNCTION_TRACE (UtPushGenericState);
 
 
     /* Push the state object onto the front of the list (stack) */
 
     State->Common.Next = *ListHead;
     *ListHead = State;
 
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtPopGenericState
  *
  * PARAMETERS:  ListHead            - Head of the state stack
  *
  * RETURN:      The popped state object
  *
  * DESCRIPTION: Pop a state object from a state stack
  *
  ******************************************************************************/
 
 ACPI_GENERIC_STATE *
 AcpiUtPopGenericState (
     ACPI_GENERIC_STATE      **ListHead)
 {
     ACPI_GENERIC_STATE      *State;
 
 
     ACPI_FUNCTION_TRACE (UtPopGenericState);
 
 
     /* Remove the state object at the head of the list (stack) */
 
     State = *ListHead;
     if (State)
     {
         /* Update the list head */
 
         *ListHead = State->Common.Next;
     }
 
     return_PTR (State);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtCreateGenericState
  *
  * PARAMETERS:  None
  *
  * RETURN:      The new state object. NULL on failure.
  *
  * DESCRIPTION: Create a generic state object.  Attempt to obtain one from
  *              the global state cache;  If none available, create a new one.
  *
  ******************************************************************************/
 
 ACPI_GENERIC_STATE *
 AcpiUtCreateGenericState (
     void)
 {
     ACPI_GENERIC_STATE      *State;
 
 
     ACPI_FUNCTION_ENTRY ();
 
 
     State = AcpiOsAcquireObject (AcpiGbl_StateCache);
     if (State)
     {
         /* Initialize */
         State->Common.DescriptorType = ACPI_DESC_TYPE_STATE;
     }
 
     return (State);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtCreateThreadState
  *
  * PARAMETERS:  None
  *
  * RETURN:      New Thread State. NULL on failure
  *
  * DESCRIPTION: Create a "Thread State" - a flavor of the generic state used
  *              to track per-thread info during method execution
  *
  ******************************************************************************/
 
 ACPI_THREAD_STATE *
 AcpiUtCreateThreadState (
     void)
 {
     ACPI_GENERIC_STATE      *State;
 
 
     ACPI_FUNCTION_TRACE (UtCreateThreadState);
 
 
     /* Create the generic state object */
 
     State = AcpiUtCreateGenericState ();
     if (!State)
     {
         return_PTR (NULL);
     }
 
     /* Init fields specific to the update struct */
 
     State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_THREAD;
     State->Thread.ThreadId = AcpiOsGetThreadId ();
 
     /* Check for invalid thread ID - zero is very bad, it will break things */
 
     if (!State->Thread.ThreadId)
     {
         ACPI_ERROR ((AE_INFO, "Invalid zero ID from AcpiOsGetThreadId"));
         State->Thread.ThreadId = (ACPI_THREAD_ID) 1;
     }
 
     return_PTR ((ACPI_THREAD_STATE *) State);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtCreateUpdateState
  *
  * PARAMETERS:  Object          - Initial Object to be installed in the state
  *              Action          - Update action to be performed
  *
  * RETURN:      New state object, null on failure
  *
  * DESCRIPTION: Create an "Update State" - a flavor of the generic state used
  *              to update reference counts and delete complex objects such
  *              as packages.
  *
  ******************************************************************************/
 
 ACPI_GENERIC_STATE *
 AcpiUtCreateUpdateState (
     ACPI_OPERAND_OBJECT     *Object,
     UINT16                  Action)
 {
     ACPI_GENERIC_STATE      *State;
 
 
     ACPI_FUNCTION_TRACE_PTR (UtCreateUpdateState, Object);
 
 
     /* Create the generic state object */
 
     State = AcpiUtCreateGenericState ();
     if (!State)
     {
         return_PTR (NULL);
     }
 
     /* Init fields specific to the update struct */
 
     State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_UPDATE;
     State->Update.Object = Object;
     State->Update.Value = Action;
 
     return_PTR (State);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtCreatePkgState
  *
  * PARAMETERS:  Object          - Initial Object to be installed in the state
  *              Action          - Update action to be performed
  *
  * RETURN:      New state object, null on failure
  *
  * DESCRIPTION: Create a "Package State"
  *
  ******************************************************************************/
 
 ACPI_GENERIC_STATE *
 AcpiUtCreatePkgState (
     void                    *InternalObject,
     void                    *ExternalObject,
     UINT16                  Index)
 {
     ACPI_GENERIC_STATE      *State;
 
 
     ACPI_FUNCTION_TRACE_PTR (UtCreatePkgState, InternalObject);
 
 
     /* Create the generic state object */
 
     State = AcpiUtCreateGenericState ();
     if (!State)
     {
         return_PTR (NULL);
     }
 
     /* Init fields specific to the update struct */
 
     State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_PACKAGE;
     State->Pkg.SourceObject = (ACPI_OPERAND_OBJECT *) InternalObject;
     State->Pkg.DestObject = ExternalObject;
     State->Pkg.Index= Index;
     State->Pkg.NumPackages = 1;
 
     return_PTR (State);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtCreateControlState
  *
  * PARAMETERS:  None
  *
  * RETURN:      New state object, null on failure
  *
  * DESCRIPTION: Create a "Control State" - a flavor of the generic state used
  *              to support nested IF/WHILE constructs in the AML.
  *
  ******************************************************************************/
 
 ACPI_GENERIC_STATE *
 AcpiUtCreateControlState (
     void)
 {
     ACPI_GENERIC_STATE      *State;
 
 
     ACPI_FUNCTION_TRACE (UtCreateControlState);
 
 
     /* Create the generic state object */
 
     State = AcpiUtCreateGenericState ();
     if (!State)
     {
         return_PTR (NULL);
     }
 
     /* Init fields specific to the control struct */
 
     State->Common.DescriptorType = ACPI_DESC_TYPE_STATE_CONTROL;
     State->Common.State = ACPI_CONTROL_CONDITIONAL_EXECUTING;
 
     return_PTR (State);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiUtDeleteGenericState
  *
  * PARAMETERS:  State               - The state object to be deleted
  *
  * RETURN:      None
  *
  * DESCRIPTION: Release a state object to the state cache. NULL state objects
  *              are ignored.
  *
  ******************************************************************************/
 
 void
 AcpiUtDeleteGenericState (
     ACPI_GENERIC_STATE      *State)
 {
     ACPI_FUNCTION_TRACE (UtDeleteGenericState);
 
 
     /* Ignore null state */
 
     if (State)
     {
         (void) AcpiOsReleaseObject (AcpiGbl_StateCache, State);
     }
     return_VOID;
 }