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

     /*******************************************************************************
      *
      * Module Name: rsxface - Public interfaces to 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.
    *
    *****************************************************************************/
   
   #define EXPORT_ACPI_INTERFACES
   
   #include <contrib/dev/acpica/include/acpi.h>
   #include <contrib/dev/acpica/include/accommon.h>
   #include <contrib/dev/acpica/include/acresrc.h>
   #include <contrib/dev/acpica/include/acnamesp.h>
   
   #define _COMPONENT          ACPI_RESOURCES
           ACPI_MODULE_NAME    ("rsxface")
   
   /* Local macros for 16,32-bit to 64-bit conversion */
   
   #define ACPI_COPY_FIELD(Out, In, Field)  ((Out)->Field = (In)->Field)
   #define ACPI_COPY_ADDRESS(Out, In)                       \
       ACPI_COPY_FIELD(Out, In, ResourceType);              \
       ACPI_COPY_FIELD(Out, In, ProducerConsumer);          \
       ACPI_COPY_FIELD(Out, In, Decode);                    \
       ACPI_COPY_FIELD(Out, In, MinAddressFixed);           \
       ACPI_COPY_FIELD(Out, In, MaxAddressFixed);           \
       ACPI_COPY_FIELD(Out, In, Info);                      \
       ACPI_COPY_FIELD(Out, In, Address.Granularity);       \
       ACPI_COPY_FIELD(Out, In, Address.Minimum);           \
       ACPI_COPY_FIELD(Out, In, Address.Maximum);           \
       ACPI_COPY_FIELD(Out, In, Address.TranslationOffset); \
       ACPI_COPY_FIELD(Out, In, Address.AddressLength);     \
       ACPI_COPY_FIELD(Out, In, ResourceSource);
   
   
   /* Local prototypes */
   
   static ACPI_STATUS
   AcpiRsMatchVendorResource (
       ACPI_RESOURCE           *Resource,
       void                    *Context);
   
   static ACPI_STATUS
   AcpiRsValidateParameters (
       ACPI_HANDLE             DeviceHandle,
       ACPI_BUFFER             *Buffer,
       ACPI_NAMESPACE_NODE     **ReturnNode);
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsValidateParameters
    *
    * PARAMETERS:  DeviceHandle    - Handle to a device
    *              Buffer          - Pointer to a data buffer
    *              ReturnNode      - Pointer to where the device node is returned
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Common parameter validation for resource interfaces
    *
    ******************************************************************************/
   
   static ACPI_STATUS
   AcpiRsValidateParameters (
       ACPI_HANDLE             DeviceHandle,
       ACPI_BUFFER             *Buffer,
       ACPI_NAMESPACE_NODE     **ReturnNode)
   {
       ACPI_STATUS             Status;
       ACPI_NAMESPACE_NODE     *Node;
   
   
       ACPI_FUNCTION_TRACE (RsValidateParameters);
   
   
       /*
        * Must have a valid handle to an ACPI device
        */
       if (!DeviceHandle)
       {
           return_ACPI_STATUS (AE_BAD_PARAMETER);
       }
   
       Node = AcpiNsValidateHandle (DeviceHandle);
       if (!Node)
       {
           return_ACPI_STATUS (AE_BAD_PARAMETER);
       }
   
       if (Node->Type != ACPI_TYPE_DEVICE)
       {
           return_ACPI_STATUS (AE_TYPE);
       }
   
       /*
        * Validate the user buffer object
        *
        * if there is a non-zero buffer length we also need a valid pointer in
        * the buffer. If it's a zero buffer length, we'll be returning the
        * needed buffer size (later), so keep going.
        */
       Status = AcpiUtValidateBuffer (Buffer);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       *ReturnNode = Node;
       return_ACPI_STATUS (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiGetIrqRoutingTable
    *
    * PARAMETERS:  DeviceHandle    - Handle to the Bus device we are querying
    *              RetBuffer       - Pointer to a buffer to receive the
    *                                current resources for the device
    *
    * RETURN:      Status
    *
    * DESCRIPTION: This function is called to get the IRQ routing table for a
    *              specific bus. The caller must first acquire a handle for the
    *              desired bus. The routine table is placed in the buffer pointed
    *              to by the RetBuffer variable parameter.
    *
    *              If the function fails an appropriate status will be returned
    *              and the value of RetBuffer is undefined.
    *
    *              This function attempts to execute the _PRT method contained in
    *              the object indicated by the passed DeviceHandle.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiGetIrqRoutingTable  (
       ACPI_HANDLE             DeviceHandle,
       ACPI_BUFFER             *RetBuffer)
   {
       ACPI_STATUS             Status;
       ACPI_NAMESPACE_NODE     *Node;
   
   
       ACPI_FUNCTION_TRACE (AcpiGetIrqRoutingTable);
   
   
       /* Validate parameters then dispatch to internal routine */
   
       Status = AcpiRsValidateParameters (DeviceHandle, RetBuffer, &Node);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       Status = AcpiRsGetPrtMethodData (Node, RetBuffer);
       return_ACPI_STATUS (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiGetIrqRoutingTable)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiGetCurrentResources
    *
    * PARAMETERS:  DeviceHandle    - Handle to the device object for the
    *                                device we are querying
    *              RetBuffer       - Pointer to a buffer to receive the
    *                                current resources for the device
    *
    * RETURN:      Status
    *
    * DESCRIPTION: This function is called to get the current resources for a
    *              specific device. The caller must first acquire a handle for
    *              the desired device. The resource data is placed in the buffer
    *              pointed to by the RetBuffer variable parameter.
    *
    *              If the function fails an appropriate status will be returned
    *              and the value of RetBuffer is undefined.
    *
    *              This function attempts to execute the _CRS method contained in
    *              the object indicated by the passed DeviceHandle.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiGetCurrentResources (
       ACPI_HANDLE             DeviceHandle,
       ACPI_BUFFER             *RetBuffer)
   {
       ACPI_STATUS             Status;
       ACPI_NAMESPACE_NODE     *Node;
   
   
       ACPI_FUNCTION_TRACE (AcpiGetCurrentResources);
   
   
       /* Validate parameters then dispatch to internal routine */
   
       Status = AcpiRsValidateParameters (DeviceHandle, RetBuffer, &Node);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       Status = AcpiRsGetCrsMethodData (Node, RetBuffer);
       return_ACPI_STATUS (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiGetCurrentResources)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiGetPossibleResources
    *
    * PARAMETERS:  DeviceHandle    - Handle to the device object for the
    *                                device we are querying
    *              RetBuffer       - Pointer to a buffer to receive the
    *                                resources for the device
    *
    * RETURN:      Status
    *
    * DESCRIPTION: This function is called to get a list of the possible resources
    *              for a specific device. The caller must first acquire a handle
    *              for the desired device. The resource data is placed in the
    *              buffer pointed to by the RetBuffer variable.
    *
    *              If the function fails an appropriate status will be returned
    *              and the value of RetBuffer is undefined.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiGetPossibleResources (
       ACPI_HANDLE             DeviceHandle,
       ACPI_BUFFER             *RetBuffer)
   {
       ACPI_STATUS             Status;
       ACPI_NAMESPACE_NODE     *Node;
   
   
       ACPI_FUNCTION_TRACE (AcpiGetPossibleResources);
   
   
       /* Validate parameters then dispatch to internal routine */
   
       Status = AcpiRsValidateParameters (DeviceHandle, RetBuffer, &Node);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       Status = AcpiRsGetPrsMethodData (Node, RetBuffer);
       return_ACPI_STATUS (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiGetPossibleResources)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiSetCurrentResources
    *
    * PARAMETERS:  DeviceHandle    - Handle to the device object for the
    *                                device we are setting resources
    *              InBuffer        - Pointer to a buffer containing the
    *                                resources to be set for the device
    *
    * RETURN:      Status
    *
    * DESCRIPTION: This function is called to set the current resources for a
    *              specific device. The caller must first acquire a handle for
    *              the desired device. The resource data is passed to the routine
    *              the buffer pointed to by the InBuffer variable.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiSetCurrentResources (
       ACPI_HANDLE             DeviceHandle,
       ACPI_BUFFER             *InBuffer)
   {
       ACPI_STATUS             Status;
       ACPI_NAMESPACE_NODE     *Node;
   
   
       ACPI_FUNCTION_TRACE (AcpiSetCurrentResources);
   
   
       /* Validate the buffer, don't allow zero length */
   
       if ((!InBuffer) ||
           (!InBuffer->Pointer) ||
           (!InBuffer->Length))
       {
           return_ACPI_STATUS (AE_BAD_PARAMETER);
       }
   
       /* Validate parameters then dispatch to internal routine */
   
       Status = AcpiRsValidateParameters (DeviceHandle, InBuffer, &Node);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       Status = AcpiRsSetSrsMethodData (Node, InBuffer);
       return_ACPI_STATUS (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiSetCurrentResources)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiGetEventResources
    *
    * PARAMETERS:  DeviceHandle    - Handle to the device object for the
    *                                device we are getting resources
    *              InBuffer        - Pointer to a buffer containing the
    *                                resources to be set for the device
    *
    * RETURN:      Status
    *
    * DESCRIPTION: This function is called to get the event resources for a
    *              specific device. The caller must first acquire a handle for
    *              the desired device. The resource data is passed to the routine
    *              the buffer pointed to by the InBuffer variable. Uses the
    *              _AEI method.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiGetEventResources (
       ACPI_HANDLE             DeviceHandle,
       ACPI_BUFFER             *RetBuffer)
   {
       ACPI_STATUS             Status;
       ACPI_NAMESPACE_NODE     *Node;
   
   
       ACPI_FUNCTION_TRACE (AcpiGetEventResources);
   
   
       /* Validate parameters then dispatch to internal routine */
   
       Status = AcpiRsValidateParameters (DeviceHandle, RetBuffer, &Node);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       Status = AcpiRsGetAeiMethodData (Node, RetBuffer);
       return_ACPI_STATUS (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiGetEventResources)
   
   
   /******************************************************************************
    *
    * FUNCTION:    AcpiResourceToAddress64
    *
    * PARAMETERS:  Resource        - Pointer to a resource
    *              Out             - Pointer to the users's return buffer
    *                                (a struct acpi_resource_address64)
    *
    * RETURN:      Status
    *
    * DESCRIPTION: If the resource is an address16, address32, or address64,
    *              copy it to the address64 return buffer. This saves the
    *              caller from having to duplicate code for different-sized
    *              addresses.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiResourceToAddress64 (
       ACPI_RESOURCE               *Resource,
       ACPI_RESOURCE_ADDRESS64     *Out)
   {
       ACPI_RESOURCE_ADDRESS16     *Address16;
       ACPI_RESOURCE_ADDRESS32     *Address32;
   
   
       if (!Resource || !Out)
       {
           return (AE_BAD_PARAMETER);
       }
   
       /* Convert 16 or 32 address descriptor to 64 */
   
       switch (Resource->Type)
       {
       case ACPI_RESOURCE_TYPE_ADDRESS16:
   
           Address16 = ACPI_CAST_PTR (
               ACPI_RESOURCE_ADDRESS16, &Resource->Data);
           ACPI_COPY_ADDRESS (Out, Address16);
           break;
   
       case ACPI_RESOURCE_TYPE_ADDRESS32:
   
           Address32 = ACPI_CAST_PTR (
               ACPI_RESOURCE_ADDRESS32, &Resource->Data);
           ACPI_COPY_ADDRESS (Out, Address32);
           break;
   
       case ACPI_RESOURCE_TYPE_ADDRESS64:
   
           /* Simple copy for 64 bit source */
   
           memcpy (Out, &Resource->Data, sizeof (ACPI_RESOURCE_ADDRESS64));
           break;
   
       default:
   
           return (AE_BAD_PARAMETER);
       }
   
       return (AE_OK);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiResourceToAddress64)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiGetVendorResource
    *
    * PARAMETERS:  DeviceHandle    - Handle for the parent device object
    *              Name            - Method name for the parent resource
    *                                (METHOD_NAME__CRS or METHOD_NAME__PRS)
    *              Uuid            - Pointer to the UUID to be matched.
    *                                includes both subtype and 16-byte UUID
    *              RetBuffer       - Where the vendor resource is returned
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Walk a resource template for the specified device to find a
    *              vendor-defined resource that matches the supplied UUID and
    *              UUID subtype. Returns a ACPI_RESOURCE of type Vendor.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiGetVendorResource (
       ACPI_HANDLE             DeviceHandle,
       char                    *Name,
       ACPI_VENDOR_UUID        *Uuid,
       ACPI_BUFFER             *RetBuffer)
   {
       ACPI_VENDOR_WALK_INFO   Info;
       ACPI_STATUS             Status;
   
   
       /* Other parameters are validated by AcpiWalkResources */
   
       if (!Uuid || !RetBuffer)
       {
           return (AE_BAD_PARAMETER);
       }
   
       Info.Uuid = Uuid;
       Info.Buffer = RetBuffer;
       Info.Status = AE_NOT_EXIST;
   
       /* Walk the _CRS or _PRS resource list for this device */
   
       Status = AcpiWalkResources (
           DeviceHandle, Name, AcpiRsMatchVendorResource, &Info);
       if (ACPI_FAILURE (Status))
       {
           return (Status);
       }
   
       return (Info.Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiGetVendorResource)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsMatchVendorResource
    *
    * PARAMETERS:  ACPI_WALK_RESOURCE_CALLBACK
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Match a vendor resource via the ACPI 3.0 UUID
    *
    ******************************************************************************/
   
   static ACPI_STATUS
   AcpiRsMatchVendorResource (
       ACPI_RESOURCE           *Resource,
       void                    *Context)
   {
       ACPI_VENDOR_WALK_INFO       *Info = Context;
       ACPI_RESOURCE_VENDOR_TYPED  *Vendor;
       ACPI_BUFFER                 *Buffer;
       ACPI_STATUS                 Status;
   
   
       /* Ignore all descriptors except Vendor */
   
       if (Resource->Type != ACPI_RESOURCE_TYPE_VENDOR)
       {
           return (AE_OK);
       }
   
       Vendor = &Resource->Data.VendorTyped;
   
       /*
        * For a valid match, these conditions must hold:
        *
        * 1) Length of descriptor data must be at least as long as a UUID struct
        * 2) The UUID subtypes must match
        * 3) The UUID data must match
        */
       if ((Vendor->ByteLength < (ACPI_UUID_LENGTH + 1)) ||
           (Vendor->UuidSubtype != Info->Uuid->Subtype)  ||
           (memcmp (Vendor->Uuid, Info->Uuid->Data, ACPI_UUID_LENGTH)))
       {
           return (AE_OK);
       }
   
       /* Validate/Allocate/Clear caller buffer */
   
       Buffer = Info->Buffer;
       Status = AcpiUtInitializeBuffer (Buffer, Resource->Length);
       if (ACPI_FAILURE (Status))
       {
           return (Status);
       }
   
       /* Found the correct resource, copy and return it */
   
       memcpy (Buffer->Pointer, Resource, Resource->Length);
       Buffer->Length = Resource->Length;
   
       /* Found the desired descriptor, terminate resource walk */
   
       Info->Status = AE_OK;
       return (AE_CTRL_TERMINATE);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiWalkResourceBuffer
    *
    * PARAMETERS:  Buffer          - Formatted buffer returned by one of the
    *                                various Get*Resource functions
    *              UserFunction    - Called for each resource
    *              Context         - Passed to UserFunction
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Walks the input resource template. The UserFunction is called
    *              once for each resource in the list.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiWalkResourceBuffer (
       ACPI_BUFFER                 *Buffer,
       ACPI_WALK_RESOURCE_CALLBACK UserFunction,
       void                        *Context)
   {
       ACPI_STATUS                 Status = AE_OK;
       ACPI_RESOURCE               *Resource;
       ACPI_RESOURCE               *ResourceEnd;
   
   
       ACPI_FUNCTION_TRACE (AcpiWalkResourceBuffer);
   
   
       /* Parameter validation */
   
       if (!Buffer || !Buffer->Pointer || !UserFunction)
       {
           return_ACPI_STATUS (AE_BAD_PARAMETER);
       }
   
       /* Buffer contains the resource list and length */
   
       Resource = ACPI_CAST_PTR (ACPI_RESOURCE, Buffer->Pointer);
       ResourceEnd = ACPI_ADD_PTR (
           ACPI_RESOURCE, Buffer->Pointer, Buffer->Length);
   
       /* Walk the resource list until the EndTag is found (or buffer end) */
   
       while (Resource < ResourceEnd)
       {
           /* Sanity check the resource type */
   
           if (Resource->Type > ACPI_RESOURCE_TYPE_MAX)
           {
               Status = AE_AML_INVALID_RESOURCE_TYPE;
               break;
           }
   
           /* Sanity check the length. It must not be zero, or we loop forever */
   
           if (!Resource->Length)
           {
               return_ACPI_STATUS (AE_AML_BAD_RESOURCE_LENGTH);
           }
   
           /* Invoke the user function, abort on any error returned */
   
           Status = UserFunction (Resource, Context);
           if (ACPI_FAILURE (Status))
           {
               if (Status == AE_CTRL_TERMINATE)
               {
                   /* This is an OK termination by the user function */
   
                   Status = AE_OK;
               }
               break;
           }
   
           /* EndTag indicates end-of-list */
   
           if (Resource->Type == ACPI_RESOURCE_TYPE_END_TAG)
           {
               break;
           }
   
           /* Get the next resource descriptor */
   
           Resource = ACPI_NEXT_RESOURCE (Resource);
       }
   
       return_ACPI_STATUS (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiWalkResourceBuffer)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiWalkResources
    *
    * PARAMETERS:  DeviceHandle    - Handle to the device object for the
    *                                device we are querying
    *              Name            - Method name of the resources we want.
    *                                (METHOD_NAME__CRS, METHOD_NAME__PRS, or
    *                                METHOD_NAME__AEI or METHOD_NAME__DMA)
    *              UserFunction    - Called for each resource
    *              Context         - Passed to UserFunction
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Retrieves the current or possible resource list for the
    *              specified device. The UserFunction is called once for
    *              each resource in the list.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiWalkResources (
       ACPI_HANDLE                 DeviceHandle,
       char                        *Name,
       ACPI_WALK_RESOURCE_CALLBACK UserFunction,
       void                        *Context)
   {
       ACPI_STATUS                 Status;
       ACPI_BUFFER                 Buffer;
   
   
       ACPI_FUNCTION_TRACE (AcpiWalkResources);
   
   
       /* Parameter validation */
   
       if (!DeviceHandle || !UserFunction || !Name ||
           (!ACPI_COMPARE_NAMESEG (Name, METHOD_NAME__CRS) &&
            !ACPI_COMPARE_NAMESEG (Name, METHOD_NAME__PRS) &&
            !ACPI_COMPARE_NAMESEG (Name, METHOD_NAME__AEI) &&
            !ACPI_COMPARE_NAMESEG (Name, METHOD_NAME__DMA)))
       {
           return_ACPI_STATUS (AE_BAD_PARAMETER);
       }
   
       /* Get the _CRS/_PRS/_AEI/_DMA resource list */
   
       Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
       Status = AcpiRsGetMethodData (DeviceHandle, Name, &Buffer);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       /* Walk the resource list and cleanup */
   
       Status = AcpiWalkResourceBuffer (&Buffer, UserFunction, Context);
       ACPI_FREE (Buffer.Pointer);
       return_ACPI_STATUS (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiWalkResources)

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