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 /******************************************************************************
  *
  * Module Name: utcache - local cache allocation 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.
  *
  *****************************************************************************/
 
 #define __UTCACHE_C__
 
 #include "acpi.h"
 #include "accommon.h"
 
 #define _COMPONENT          ACPI_UTILITIES
         ACPI_MODULE_NAME    ("utcache")
 
 
 #ifdef ACPI_USE_LOCAL_CACHE
 /*******************************************************************************
  *
  * FUNCTION:    AcpiOsCreateCache
  *
  * PARAMETERS:  CacheName       - Ascii name for the cache
  *              ObjectSize      - Size of each cached object
  *              MaxDepth        - Maximum depth of the cache (in objects)
  *              ReturnCache     - Where the new cache object is returned
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Create a cache object
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiOsCreateCache (
     char                    *CacheName,
     UINT16                  ObjectSize,
     UINT16                  MaxDepth,
     ACPI_MEMORY_LIST        **ReturnCache)
 {
     ACPI_MEMORY_LIST        *Cache;
 
 
     ACPI_FUNCTION_ENTRY ();
 
 
     if (!CacheName || !ReturnCache || (ObjectSize < 16))
     {
         return (AE_BAD_PARAMETER);
     }
 
     /* Create the cache object */
 
     Cache = AcpiOsAllocate (sizeof (ACPI_MEMORY_LIST));
     if (!Cache)
     {
         return (AE_NO_MEMORY);
     }
 
     /* Populate the cache object and return it */
 
     ACPI_MEMSET (Cache, 0, sizeof (ACPI_MEMORY_LIST));
     Cache->LinkOffset = 8;
     Cache->ListName   = CacheName;
     Cache->ObjectSize = ObjectSize;
     Cache->MaxDepth   = MaxDepth;
 
     *ReturnCache = Cache;
     return (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiOsPurgeCache
  *
  * PARAMETERS:  Cache           - Handle to cache object
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Free all objects within the requested cache.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiOsPurgeCache (
     ACPI_MEMORY_LIST        *Cache)
 {
     char                    *Next;
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_ENTRY ();
 
 
     if (!Cache)
     {
         return (AE_BAD_PARAMETER);
     }
 
     Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
     if (ACPI_FAILURE (Status))
     {
         return (Status);
     }
 
     /* Walk the list of objects in this cache */
 
     while (Cache->ListHead)
     {
         /* Delete and unlink one cached state object */
 
         Next = *(ACPI_CAST_INDIRECT_PTR (char,
                     &(((char *) Cache->ListHead)[Cache->LinkOffset])));
         ACPI_FREE (Cache->ListHead);
 
         Cache->ListHead = Next;
         Cache->CurrentDepth--;
     }
 
     (void) AcpiUtReleaseMutex (ACPI_MTX_CACHES);
     return (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiOsDeleteCache
  *
  * PARAMETERS:  Cache           - Handle to cache object
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Free all objects within the requested cache and delete the
  *              cache object.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiOsDeleteCache (
     ACPI_MEMORY_LIST        *Cache)
 {
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_ENTRY ();
 
 
    /* Purge all objects in the cache */
 
     Status = AcpiOsPurgeCache (Cache);
     if (ACPI_FAILURE (Status))
     {
         return (Status);
     }
 
     /* Now we can delete the cache object */
 
     AcpiOsFree (Cache);
     return (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiOsReleaseObject
  *
  * PARAMETERS:  Cache       - Handle to cache object
  *              Object      - The object to be released
  *
  * RETURN:      None
  *
  * DESCRIPTION: Release an object to the specified cache.  If cache is full,
  *              the object is deleted.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiOsReleaseObject (
     ACPI_MEMORY_LIST        *Cache,
     void                    *Object)
 {
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_ENTRY ();
 
 
     if (!Cache || !Object)
     {
         return (AE_BAD_PARAMETER);
     }
 
     /* If cache is full, just free this object */
 
     if (Cache->CurrentDepth >= Cache->MaxDepth)
     {
         ACPI_FREE (Object);
         ACPI_MEM_TRACKING (Cache->TotalFreed++);
     }
 
     /* Otherwise put this object back into the cache */
 
     else
     {
         Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
         if (ACPI_FAILURE (Status))
         {
             return (Status);
         }
 
         /* Mark the object as cached */
 
         ACPI_MEMSET (Object, 0xCA, Cache->ObjectSize);
         ACPI_SET_DESCRIPTOR_TYPE (Object, ACPI_DESC_TYPE_CACHED);
 
         /* Put the object at the head of the cache list */
 
         * (ACPI_CAST_INDIRECT_PTR (char,
             &(((char *) Object)[Cache->LinkOffset]))) = Cache->ListHead;
         Cache->ListHead = Object;
         Cache->CurrentDepth++;
 
         (void) AcpiUtReleaseMutex (ACPI_MTX_CACHES);
     }
 
     return (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiOsAcquireObject
  *
  * PARAMETERS:  Cache           - Handle to cache object
  *
  * RETURN:      the acquired object.  NULL on error
  *
  * DESCRIPTION: Get an object from the specified cache.  If cache is empty,
  *              the object is allocated.
  *
  ******************************************************************************/
 
 void *
 AcpiOsAcquireObject (
     ACPI_MEMORY_LIST        *Cache)
 {
     ACPI_STATUS             Status;
     void                    *Object;
 
 
     ACPI_FUNCTION_NAME (OsAcquireObject);
 
 
     if (!Cache)
     {
         return (NULL);
     }
 
     Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
     if (ACPI_FAILURE (Status))
     {
         return (NULL);
     }
 
     ACPI_MEM_TRACKING (Cache->Requests++);
 
     /* Check the cache first */
 
     if (Cache->ListHead)
     {
         /* There is an object available, use it */
 
         Object = Cache->ListHead;
         Cache->ListHead = *(ACPI_CAST_INDIRECT_PTR (char,
                                 &(((char *) Object)[Cache->LinkOffset])));
 
         Cache->CurrentDepth--;
 
         ACPI_MEM_TRACKING (Cache->Hits++);
         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
             "Object %p from %s cache\n", Object, Cache->ListName));
 
         Status = AcpiUtReleaseMutex (ACPI_MTX_CACHES);
         if (ACPI_FAILURE (Status))
         {
             return (NULL);
         }
 
         /* Clear (zero) the previously used Object */
 
         ACPI_MEMSET (Object, 0, Cache->ObjectSize);
     }
     else
     {
         /* The cache is empty, create a new object */
 
         ACPI_MEM_TRACKING (Cache->TotalAllocated++);
 
 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
         if ((Cache->TotalAllocated - Cache->TotalFreed) > Cache->MaxOccupied)
         {
             Cache->MaxOccupied = Cache->TotalAllocated - Cache->TotalFreed;
         }
 #endif
 
         /* Avoid deadlock with ACPI_ALLOCATE_ZEROED */
 
         Status = AcpiUtReleaseMutex (ACPI_MTX_CACHES);
         if (ACPI_FAILURE (Status))
         {
             return (NULL);
         }
 
         Object = ACPI_ALLOCATE_ZEROED (Cache->ObjectSize);
         if (!Object)
         {
             return (NULL);
         }
     }
 
     return (Object);
 }
 #endif /* ACPI_USE_LOCAL_CACHE */