FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/resources/rsutils.c

     /*******************************************************************************
      *
      * Module Name: rsutils - Utilities for the resource manager
      *
      ******************************************************************************/
     
     /******************************************************************************
      *
      * 1. Copyright Notice
     *
     * Some or all of this work - Copyright (c) 1999 - 2022, 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.
    *
    *****************************************************************************
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * following license:
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    * 1. Redistributions of source code must retain the above copyright
    *    notice, this list of conditions, and the following disclaimer,
    *    without modification.
    * 2. Redistributions in binary form must reproduce at minimum a disclaimer
    *    substantially similar to the "NO WARRANTY" disclaimer below
    *    ("Disclaimer") and any redistribution must be conditioned upon
    *    including a substantially similar Disclaimer requirement for further
    *    binary redistribution.
    * 3. Neither the names of the above-listed copyright holders nor the names
    *    of any contributors may be used to endorse or promote products derived
    *    from this software without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * GNU General Public License ("GPL") version 2 as published by the Free
    * Software Foundation.
    *
    *****************************************************************************/
   
   #include <contrib/dev/acpica/include/acpi.h>
   #include <contrib/dev/acpica/include/accommon.h>
   #include <contrib/dev/acpica/include/acnamesp.h>
   #include <contrib/dev/acpica/include/acresrc.h>
   
   
   #define _COMPONENT          ACPI_RESOURCES
           ACPI_MODULE_NAME    ("rsutils")
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsDecodeBitmask
    *
    * PARAMETERS:  Mask            - Bitmask to decode
    *              List            - Where the converted list is returned
    *
    * RETURN:      Count of bits set (length of list)
    *
    * DESCRIPTION: Convert a bit mask into a list of values
    *
    ******************************************************************************/
   
   UINT8
   AcpiRsDecodeBitmask (
       UINT16                  Mask,
       UINT8                   *List)
   {
       UINT8                   i;
       UINT8                   BitCount;
   
   
       ACPI_FUNCTION_ENTRY ();
   
   
       /* Decode the mask bits */
   
       for (i = 0, BitCount = 0; Mask; i++)
       {
           if (Mask & 0x0001)
           {
               List[BitCount] = i;
               BitCount++;
           }
   
           Mask >>= 1;
       }
   
       return (BitCount);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsEncodeBitmask
    *
    * PARAMETERS:  List            - List of values to encode
    *              Count           - Length of list
    *
    * RETURN:      Encoded bitmask
    *
    * DESCRIPTION: Convert a list of values to an encoded bitmask
    *
    ******************************************************************************/
   
   UINT16
   AcpiRsEncodeBitmask (
       UINT8                   *List,
       UINT8                   Count)
   {
       UINT32                  i;
       UINT16                  Mask;
   
   
       ACPI_FUNCTION_ENTRY ();
   
   
       /* Encode the list into a single bitmask */
   
       for (i = 0, Mask = 0; i < Count; i++)
       {
           Mask |= (0x1 << List[i]);
       }
   
       return (Mask);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsMoveData
    *
    * PARAMETERS:  Destination         - Pointer to the destination descriptor
    *              Source              - Pointer to the source descriptor
    *              ItemCount           - How many items to move
    *              MoveType            - Byte width
    *
    * RETURN:      None
    *
    * DESCRIPTION: Move multiple data items from one descriptor to another. Handles
    *              alignment issues and endian issues if necessary, as configured
    *              via the ACPI_MOVE_* macros. (This is why a memcpy is not used)
    *
    ******************************************************************************/
   
   void
   AcpiRsMoveData (
       void                    *Destination,
       void                    *Source,
       UINT16                  ItemCount,
       UINT8                   MoveType)
   {
       UINT32                  i;
   
   
       ACPI_FUNCTION_ENTRY ();
   
   
       /* One move per item */
   
       for (i = 0; i < ItemCount; i++)
       {
           switch (MoveType)
           {
           /*
            * For the 8-bit case, we can perform the move all at once
            * since there are no alignment or endian issues
            */
           case ACPI_RSC_MOVE8:
           case ACPI_RSC_MOVE_GPIO_RES:
           case ACPI_RSC_MOVE_SERIAL_VEN:
           case ACPI_RSC_MOVE_SERIAL_RES:
   
               memcpy (Destination, Source, ItemCount);
               return;
   
           /*
            * 16-, 32-, and 64-bit cases must use the move macros that perform
            * endian conversion and/or accommodate hardware that cannot perform
            * misaligned memory transfers
            */
           case ACPI_RSC_MOVE16:
           case ACPI_RSC_MOVE_GPIO_PIN:
   
               ACPI_MOVE_16_TO_16 (
                   &ACPI_CAST_PTR (UINT16, Destination)[i],
                   &ACPI_CAST_PTR (UINT16, Source)[i]);
               break;
   
           case ACPI_RSC_MOVE32:
   
               ACPI_MOVE_32_TO_32 (
                   &ACPI_CAST_PTR (UINT32, Destination)[i],
                   &ACPI_CAST_PTR (UINT32, Source)[i]);
               break;
   
           case ACPI_RSC_MOVE64:
   
               ACPI_MOVE_64_TO_64 (
                   &ACPI_CAST_PTR (UINT64, Destination)[i],
                   &ACPI_CAST_PTR (UINT64, Source)[i]);
               break;
   
           default:
   
               return;
           }
       }
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsSetResourceLength
    *
    * PARAMETERS:  TotalLength         - Length of the AML descriptor, including
    *                                    the header and length fields.
    *              Aml                 - Pointer to the raw AML descriptor
    *
    * RETURN:      None
    *
    * DESCRIPTION: Set the ResourceLength field of an AML
    *              resource descriptor, both Large and Small descriptors are
    *              supported automatically. Note: Descriptor Type field must
    *              be valid.
    *
    ******************************************************************************/
   
   void
   AcpiRsSetResourceLength (
       ACPI_RSDESC_SIZE        TotalLength,
       AML_RESOURCE            *Aml)
   {
       ACPI_RS_LENGTH          ResourceLength;
   
   
       ACPI_FUNCTION_ENTRY ();
   
   
       /* Length is the total descriptor length minus the header length */
   
       ResourceLength = (ACPI_RS_LENGTH)
           (TotalLength - AcpiUtGetResourceHeaderLength (Aml));
   
       /* Length is stored differently for large and small descriptors */
   
       if (Aml->SmallHeader.DescriptorType & ACPI_RESOURCE_NAME_LARGE)
       {
           /* Large descriptor -- bytes 1-2 contain the 16-bit length */
   
           ACPI_MOVE_16_TO_16 (
               &Aml->LargeHeader.ResourceLength, &ResourceLength);
       }
       else
       {
           /*
            * Small descriptor -- bits 2:0 of byte 0 contain the length
            * Clear any existing length, preserving descriptor type bits
            */
           Aml->SmallHeader.DescriptorType = (UINT8)
               ((Aml->SmallHeader.DescriptorType &
                   ~ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK)
               | ResourceLength);
       }
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsSetResourceHeader
    *
    * PARAMETERS:  DescriptorType      - Byte to be inserted as the type
    *              TotalLength         - Length of the AML descriptor, including
    *                                    the header and length fields.
    *              Aml                 - Pointer to the raw AML descriptor
    *
    * RETURN:      None
    *
    * DESCRIPTION: Set the DescriptorType and ResourceLength fields of an AML
    *              resource descriptor, both Large and Small descriptors are
    *              supported automatically
    *
    ******************************************************************************/
   
   void
   AcpiRsSetResourceHeader (
       UINT8                   DescriptorType,
       ACPI_RSDESC_SIZE        TotalLength,
       AML_RESOURCE            *Aml)
   {
       ACPI_FUNCTION_ENTRY ();
   
   
       /* Set the Resource Type */
   
       Aml->SmallHeader.DescriptorType = DescriptorType;
   
       /* Set the Resource Length */
   
       AcpiRsSetResourceLength (TotalLength, Aml);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsStrcpy
    *
    * PARAMETERS:  Destination         - Pointer to the destination string
    *              Source              - Pointer to the source string
    *
    * RETURN:      String length, including NULL terminator
    *
    * DESCRIPTION: Local string copy that returns the string length, saving a
    *              strcpy followed by a strlen.
    *
    ******************************************************************************/
   
   static UINT16
   AcpiRsStrcpy (
       char                    *Destination,
       char                    *Source)
   {
       UINT16                  i;
   
   
       ACPI_FUNCTION_ENTRY ();
   
   
       for (i = 0; Source[i]; i++)
       {
           Destination[i] = Source[i];
       }
   
       Destination[i] = 0;
   
       /* Return string length including the NULL terminator */
   
       return ((UINT16) (i + 1));
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsGetResourceSource
    *
    * PARAMETERS:  ResourceLength      - Length field of the descriptor
    *              MinimumLength       - Minimum length of the descriptor (minus
    *                                    any optional fields)
    *              ResourceSource      - Where the ResourceSource is returned
    *              Aml                 - Pointer to the raw AML descriptor
    *              StringPtr           - (optional) where to store the actual
    *                                    ResourceSource string
    *
    * RETURN:      Length of the string plus NULL terminator, rounded up to native
    *              word boundary
    *
    * DESCRIPTION: Copy the optional ResourceSource data from a raw AML descriptor
    *              to an internal resource descriptor
    *
    ******************************************************************************/
   
   ACPI_RS_LENGTH
   AcpiRsGetResourceSource (
       ACPI_RS_LENGTH          ResourceLength,
       ACPI_RS_LENGTH          MinimumLength,
       ACPI_RESOURCE_SOURCE    *ResourceSource,
       AML_RESOURCE            *Aml,
       char                    *StringPtr)
   {
       ACPI_RSDESC_SIZE        TotalLength;
       UINT8                   *AmlResourceSource;
   
   
       ACPI_FUNCTION_ENTRY ();
   
   
       TotalLength = ResourceLength + sizeof (AML_RESOURCE_LARGE_HEADER);
       AmlResourceSource = ACPI_ADD_PTR (UINT8, Aml, MinimumLength);
   
       /*
        * ResourceSource is present if the length of the descriptor is longer
        * than the minimum length.
        *
        * Note: Some resource descriptors will have an additional null, so
        * we add 1 to the minimum length.
        */
       if (TotalLength > (ACPI_RSDESC_SIZE) (MinimumLength + 1))
       {
           /* Get the ResourceSourceIndex */
   
           ResourceSource->Index = AmlResourceSource[0];
   
           ResourceSource->StringPtr = StringPtr;
           if (!StringPtr)
           {
               /*
                * String destination pointer is not specified; Set the String
                * pointer to the end of the current ResourceSource structure.
                */
               ResourceSource->StringPtr = ACPI_ADD_PTR (
                   char, ResourceSource, sizeof (ACPI_RESOURCE_SOURCE));
           }
   
           /*
            * In order for the Resource length to be a multiple of the native
            * word, calculate the length of the string (+1 for NULL terminator)
            * and expand to the next word multiple.
            *
            * Zero the entire area of the buffer.
            */
           TotalLength = (UINT32) strlen (
               ACPI_CAST_PTR (char, &AmlResourceSource[1])) + 1;
   
           TotalLength = (UINT32) ACPI_ROUND_UP_TO_NATIVE_WORD (TotalLength);
   
           memset (ResourceSource->StringPtr, 0, TotalLength);
   
           /* Copy the ResourceSource string to the destination */
   
           ResourceSource->StringLength = AcpiRsStrcpy (
               ResourceSource->StringPtr,
               ACPI_CAST_PTR (char, &AmlResourceSource[1]));
   
           return ((ACPI_RS_LENGTH) TotalLength);
       }
   
       /* ResourceSource is not present */
   
       ResourceSource->Index = 0;
       ResourceSource->StringLength = 0;
       ResourceSource->StringPtr = NULL;
       return (0);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsSetResourceSource
    *
    * PARAMETERS:  Aml                 - Pointer to the raw AML descriptor
    *              MinimumLength       - Minimum length of the descriptor (minus
    *                                    any optional fields)
    *              ResourceSource      - Internal ResourceSource
   
    *
    * RETURN:      Total length of the AML descriptor
    *
    * DESCRIPTION: Convert an optional ResourceSource from internal format to a
    *              raw AML resource descriptor
    *
    ******************************************************************************/
   
   ACPI_RSDESC_SIZE
   AcpiRsSetResourceSource (
       AML_RESOURCE            *Aml,
       ACPI_RS_LENGTH          MinimumLength,
       ACPI_RESOURCE_SOURCE    *ResourceSource)
   {
       UINT8                   *AmlResourceSource;
       ACPI_RSDESC_SIZE        DescriptorLength;
   
   
       ACPI_FUNCTION_ENTRY ();
   
   
       DescriptorLength = MinimumLength;
   
       /* Non-zero string length indicates presence of a ResourceSource */
   
       if (ResourceSource->StringLength)
       {
           /* Point to the end of the AML descriptor */
   
           AmlResourceSource = ACPI_ADD_PTR (UINT8, Aml, MinimumLength);
   
           /* Copy the ResourceSourceIndex */
   
           AmlResourceSource[0] = (UINT8) ResourceSource->Index;
   
           /* Copy the ResourceSource string */
   
           strcpy (ACPI_CAST_PTR (char, &AmlResourceSource[1]),
               ResourceSource->StringPtr);
   
           /*
            * Add the length of the string (+ 1 for null terminator) to the
            * final descriptor length
            */
           DescriptorLength += ((ACPI_RSDESC_SIZE)
               ResourceSource->StringLength + 1);
       }
   
       /* Return the new total length of the AML descriptor */
   
       return (DescriptorLength);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsGetPrtMethodData
    *
    * PARAMETERS:  Node            - Device node
    *              RetBuffer       - Pointer to a buffer structure for the
    *                                results
    *
    * RETURN:      Status
    *
    * DESCRIPTION: This function is called to get the _PRT value of an object
    *              contained in an object specified by the handle passed in
    *
    *              If the function fails an appropriate status will be returned
    *              and the contents of the callers buffer is undefined.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiRsGetPrtMethodData (
       ACPI_NAMESPACE_NODE     *Node,
       ACPI_BUFFER             *RetBuffer)
   {
       ACPI_OPERAND_OBJECT     *ObjDesc;
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE (RsGetPrtMethodData);
   
   
       /* Parameters guaranteed valid by caller */
   
       /* Execute the method, no parameters */
   
       Status = AcpiUtEvaluateObject (
           Node, METHOD_NAME__PRT, ACPI_BTYPE_PACKAGE, &ObjDesc);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       /*
        * Create a resource linked list from the byte stream buffer that comes
        * back from the _CRS method execution.
        */
       Status = AcpiRsCreatePciRoutingTable (ObjDesc, RetBuffer);
   
       /* On exit, we must delete the object returned by EvaluateObject */
   
       AcpiUtRemoveReference (ObjDesc);
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsGetCrsMethodData
    *
    * PARAMETERS:  Node            - Device node
    *              RetBuffer       - Pointer to a buffer structure for the
    *                                results
    *
    * RETURN:      Status
    *
    * DESCRIPTION: This function is called to get the _CRS value of an object
    *              contained in an object specified by the handle passed in
    *
    *              If the function fails an appropriate status will be returned
    *              and the contents of the callers buffer is undefined.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiRsGetCrsMethodData (
       ACPI_NAMESPACE_NODE     *Node,
       ACPI_BUFFER             *RetBuffer)
   {
       ACPI_OPERAND_OBJECT     *ObjDesc;
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE (RsGetCrsMethodData);
   
   
       /* Parameters guaranteed valid by caller */
   
       /* Execute the method, no parameters */
   
       Status = AcpiUtEvaluateObject (
           Node, METHOD_NAME__CRS, ACPI_BTYPE_BUFFER, &ObjDesc);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       /*
        * Make the call to create a resource linked list from the
        * byte stream buffer that comes back from the _CRS method
        * execution.
        */
       Status = AcpiRsCreateResourceList (ObjDesc, RetBuffer);
   
       /* On exit, we must delete the object returned by evaluateObject */
   
       AcpiUtRemoveReference (ObjDesc);
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsGetPrsMethodData
    *
    * PARAMETERS:  Node            - Device node
    *              RetBuffer       - Pointer to a buffer structure for the
    *                                results
    *
    * RETURN:      Status
    *
    * DESCRIPTION: This function is called to get the _PRS value of an object
    *              contained in an object specified by the handle passed in
    *
    *              If the function fails an appropriate status will be returned
    *              and the contents of the callers buffer is undefined.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiRsGetPrsMethodData (
       ACPI_NAMESPACE_NODE     *Node,
       ACPI_BUFFER             *RetBuffer)
   {
       ACPI_OPERAND_OBJECT     *ObjDesc;
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE (RsGetPrsMethodData);
   
   
       /* Parameters guaranteed valid by caller */
   
       /* Execute the method, no parameters */
   
       Status = AcpiUtEvaluateObject (
           Node, METHOD_NAME__PRS, ACPI_BTYPE_BUFFER, &ObjDesc);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       /*
        * Make the call to create a resource linked list from the
        * byte stream buffer that comes back from the _CRS method
        * execution.
        */
       Status = AcpiRsCreateResourceList (ObjDesc, RetBuffer);
   
       /* On exit, we must delete the object returned by evaluateObject */
   
       AcpiUtRemoveReference (ObjDesc);
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsGetAeiMethodData
    *
    * PARAMETERS:  Node            - Device node
    *              RetBuffer       - Pointer to a buffer structure for the
    *                                results
    *
    * RETURN:      Status
    *
    * DESCRIPTION: This function is called to get the _AEI value of an object
    *              contained in an object specified by the handle passed in
    *
    *              If the function fails an appropriate status will be returned
    *              and the contents of the callers buffer is undefined.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiRsGetAeiMethodData (
       ACPI_NAMESPACE_NODE     *Node,
       ACPI_BUFFER             *RetBuffer)
   {
       ACPI_OPERAND_OBJECT     *ObjDesc;
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE (RsGetAeiMethodData);
   
   
       /* Parameters guaranteed valid by caller */
   
       /* Execute the method, no parameters */
   
       Status = AcpiUtEvaluateObject (
           Node, METHOD_NAME__AEI, ACPI_BTYPE_BUFFER, &ObjDesc);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       /*
        * Make the call to create a resource linked list from the
        * byte stream buffer that comes back from the _CRS method
        * execution.
        */
       Status = AcpiRsCreateResourceList (ObjDesc, RetBuffer);
   
       /* On exit, we must delete the object returned by evaluateObject */
   
       AcpiUtRemoveReference (ObjDesc);
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsGetMethodData
    *
    * PARAMETERS:  Handle          - Handle to the containing object
    *              Path            - Path to method, relative to Handle
    *              RetBuffer       - Pointer to a buffer structure for the
    *                                results
    *
    * RETURN:      Status
    *
    * DESCRIPTION: This function is called to get the _CRS or _PRS value of an
    *              object contained in an object specified by the handle passed in
    *
    *              If the function fails an appropriate status will be returned
    *              and the contents of the callers buffer is undefined.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiRsGetMethodData (
       ACPI_HANDLE             Handle,
       const char              *Path,
       ACPI_BUFFER             *RetBuffer)
   {
       ACPI_OPERAND_OBJECT     *ObjDesc;
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE (RsGetMethodData);
   
   
       /* Parameters guaranteed valid by caller */
   
       /* Execute the method, no parameters */
   
       Status = AcpiUtEvaluateObject (
           ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Handle),
           Path, ACPI_BTYPE_BUFFER, &ObjDesc);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       /*
        * Make the call to create a resource linked list from the
        * byte stream buffer that comes back from the method
        * execution.
        */
       Status = AcpiRsCreateResourceList (ObjDesc, RetBuffer);
   
       /* On exit, we must delete the object returned by EvaluateObject */
   
       AcpiUtRemoveReference (ObjDesc);
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsSetSrsMethodData
    *
    * PARAMETERS:  Node            - Device node
    *              InBuffer        - Pointer to a buffer structure of the
    *                                parameter
    *
    * RETURN:      Status
    *
    * DESCRIPTION: This function is called to set the _SRS of an object contained
    *              in an object specified by the handle passed in
    *
    *              If the function fails an appropriate status will be returned
    *              and the contents of the callers buffer is undefined.
    *
    * Note: Parameters guaranteed valid by caller
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiRsSetSrsMethodData (
       ACPI_NAMESPACE_NODE     *Node,
       ACPI_BUFFER             *InBuffer)
   {
       ACPI_EVALUATE_INFO      *Info;
       ACPI_OPERAND_OBJECT     *Args[2];
       ACPI_STATUS             Status;
       ACPI_BUFFER             Buffer;
   
   
       ACPI_FUNCTION_TRACE (RsSetSrsMethodData);
   
   
       /* Allocate and initialize the evaluation information block */
   
       Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
       if (!Info)
       {
           return_ACPI_STATUS (AE_NO_MEMORY);
       }
   
       Info->PrefixNode = Node;
       Info->RelativePathname = METHOD_NAME__SRS;
       Info->Parameters = Args;
       Info->Flags = ACPI_IGNORE_RETURN_VALUE;
   
       /*
        * The InBuffer parameter will point to a linked list of
        * resource parameters. It needs to be formatted into a
        * byte stream to be sent in as an input parameter to _SRS
        *
        * Convert the linked list into a byte stream
        */
       Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
       Status = AcpiRsCreateAmlResources (InBuffer, &Buffer);
       if (ACPI_FAILURE (Status))
       {
           goto Cleanup;
       }
   
       /* Create and initialize the method parameter object */
   
       Args[0] = AcpiUtCreateInternalObject (ACPI_TYPE_BUFFER);
       if (!Args[0])
       {
           /*
            * Must free the buffer allocated above (otherwise it is freed
            * later)
            */
           ACPI_FREE (Buffer.Pointer);
           Status = AE_NO_MEMORY;
           goto Cleanup;
       }
   
       Args[0]->Buffer.Length  = (UINT32) Buffer.Length;
       Args[0]->Buffer.Pointer = Buffer.Pointer;
       Args[0]->Common.Flags   = AOPOBJ_DATA_VALID;
       Args[1] = NULL;
   
       /* Execute the method, no return value is expected */
   
       Status = AcpiNsEvaluate (Info);
   
       /* Clean up and return the status from AcpiNsEvaluate */
   
       AcpiUtRemoveReference (Args[0]);
   
   Cleanup:
       ACPI_FREE (Info);
       return_ACPI_STATUS (Status);
   }

Cache object: 7239e9d5fb5748ebc8a29c0470ca57fb