FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/utilities/utresrc.c

     /*******************************************************************************
      *
      * Module Name: utresrc - Resource management utilities
      *
      ******************************************************************************/
     
     /******************************************************************************
      *
      * 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/acresrc.h>
   
   
   #define _COMPONENT          ACPI_UTILITIES
           ACPI_MODULE_NAME    ("utresrc")
   
   
   /*
    * Base sizes of the raw AML resource descriptors, indexed by resource type.
    * Zero indicates a reserved (and therefore invalid) resource type.
    */
   const UINT8                 AcpiGbl_ResourceAmlSizes[] =
   {
       /* Small descriptors */
   
       0,
       0,
       0,
       0,
       ACPI_AML_SIZE_SMALL (AML_RESOURCE_IRQ),
       ACPI_AML_SIZE_SMALL (AML_RESOURCE_DMA),
       ACPI_AML_SIZE_SMALL (AML_RESOURCE_START_DEPENDENT),
       ACPI_AML_SIZE_SMALL (AML_RESOURCE_END_DEPENDENT),
       ACPI_AML_SIZE_SMALL (AML_RESOURCE_IO),
       ACPI_AML_SIZE_SMALL (AML_RESOURCE_FIXED_IO),
       ACPI_AML_SIZE_SMALL (AML_RESOURCE_FIXED_DMA),
       0,
       0,
       0,
       ACPI_AML_SIZE_SMALL (AML_RESOURCE_VENDOR_SMALL),
       ACPI_AML_SIZE_SMALL (AML_RESOURCE_END_TAG),
   
       /* Large descriptors */
   
       0,
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_MEMORY24),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_GENERIC_REGISTER),
       0,
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_VENDOR_LARGE),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_MEMORY32),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_FIXED_MEMORY32),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS32),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS16),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_EXTENDED_IRQ),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS64),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_EXTENDED_ADDRESS64),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_GPIO),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_FUNCTION),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_COMMON_SERIALBUS),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_CONFIG),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_GROUP),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_GROUP_FUNCTION),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_GROUP_CONFIG),
   };
   
   const UINT8                 AcpiGbl_ResourceAmlSerialBusSizes[] =
   {
       0,
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_I2C_SERIALBUS),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_SPI_SERIALBUS),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_UART_SERIALBUS),
       ACPI_AML_SIZE_LARGE (AML_RESOURCE_CSI2_SERIALBUS),
   };
   
   
   /*
    * Resource types, used to validate the resource length field.
    * The length of fixed-length types must match exactly, variable
    * lengths must meet the minimum required length, etc.
    * Zero indicates a reserved (and therefore invalid) resource type.
    */
   static const UINT8          AcpiGbl_ResourceTypes[] =
   {
       /* Small descriptors */
   
       0,
       0,
       0,
       0,
       ACPI_SMALL_VARIABLE_LENGTH,     /* 04 IRQ */
       ACPI_FIXED_LENGTH,              /* 05 DMA */
       ACPI_SMALL_VARIABLE_LENGTH,     /* 06 StartDependentFunctions */
       ACPI_FIXED_LENGTH,              /* 07 EndDependentFunctions */
       ACPI_FIXED_LENGTH,              /* 08 IO */
       ACPI_FIXED_LENGTH,              /* 09 FixedIO */
       ACPI_FIXED_LENGTH,              /* 0A FixedDMA */
       0,
       0,
       0,
       ACPI_VARIABLE_LENGTH,           /* 0E VendorShort */
       ACPI_FIXED_LENGTH,              /* 0F EndTag */
   
       /* Large descriptors */
   
       0,
       ACPI_FIXED_LENGTH,              /* 01 Memory24 */
       ACPI_FIXED_LENGTH,              /* 02 GenericRegister */
       0,
       ACPI_VARIABLE_LENGTH,           /* 04 VendorLong */
       ACPI_FIXED_LENGTH,              /* 05 Memory32 */
       ACPI_FIXED_LENGTH,              /* 06 Memory32Fixed */
       ACPI_VARIABLE_LENGTH,           /* 07 Dword* address */
       ACPI_VARIABLE_LENGTH,           /* 08 Word* address */
       ACPI_VARIABLE_LENGTH,           /* 09 ExtendedIRQ */
       ACPI_VARIABLE_LENGTH,           /* 0A Qword* address */
       ACPI_FIXED_LENGTH,              /* 0B Extended* address */
       ACPI_VARIABLE_LENGTH,           /* 0C Gpio* */
       ACPI_VARIABLE_LENGTH,           /* 0D PinFunction */
       ACPI_VARIABLE_LENGTH,           /* 0E *SerialBus */
       ACPI_VARIABLE_LENGTH,           /* 0F PinConfig */
       ACPI_VARIABLE_LENGTH,           /* 10 PinGroup */
       ACPI_VARIABLE_LENGTH,           /* 11 PinGroupFunction */
       ACPI_VARIABLE_LENGTH,           /* 12 PinGroupConfig */
   };
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiUtWalkAmlResources
    *
    * PARAMETERS:  WalkState           - Current walk info
    * PARAMETERS:  Aml                 - Pointer to the raw AML resource template
    *              AmlLength           - Length of the entire template
    *              UserFunction        - Called once for each descriptor found. If
    *                                    NULL, a pointer to the EndTag is returned
    *              Context             - Passed to UserFunction
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Walk a raw AML resource list(buffer). User function called
    *              once for each resource found.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiUtWalkAmlResources (
       ACPI_WALK_STATE         *WalkState,
       UINT8                   *Aml,
       ACPI_SIZE               AmlLength,
       ACPI_WALK_AML_CALLBACK  UserFunction,
       void                    **Context)
   {
       ACPI_STATUS             Status;
       UINT8                   *EndAml;
       UINT8                   ResourceIndex;
       UINT32                  Length;
       UINT32                  Offset = 0;
       UINT8                   EndTag[2] = {0x79, 0x00};
   
   
       ACPI_FUNCTION_TRACE (UtWalkAmlResources);
   
   
       /* The absolute minimum resource template is one EndTag descriptor */
   
       if (AmlLength < sizeof (AML_RESOURCE_END_TAG))
       {
           return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
       }
   
       /* Point to the end of the resource template buffer */
   
       EndAml = Aml + AmlLength;
   
       /* Walk the byte list, abort on any invalid descriptor type or length */
   
       while (Aml < EndAml)
       {
           /* Validate the Resource Type and Resource Length */
   
           Status = AcpiUtValidateResource (WalkState, Aml, &ResourceIndex);
           if (ACPI_FAILURE (Status))
           {
               /*
                * Exit on failure. Cannot continue because the descriptor
                * length may be bogus also.
                */
               return_ACPI_STATUS (Status);
           }
   
           /* Get the length of this descriptor */
   
           Length = AcpiUtGetDescriptorLength (Aml);
   
           /* Invoke the user function */
   
           if (UserFunction)
           {
               Status = UserFunction (
                   Aml, Length, Offset, ResourceIndex, Context);
               if (ACPI_FAILURE (Status))
               {
                   return_ACPI_STATUS (Status);
               }
           }
   
           /* An EndTag descriptor terminates this resource template */
   
           if (AcpiUtGetResourceType (Aml) == ACPI_RESOURCE_NAME_END_TAG)
           {
               /*
                * There must be at least one more byte in the buffer for
                * the 2nd byte of the EndTag
                */
               if ((Aml + 1) >= EndAml)
               {
                   return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
               }
   
               /*
                * Don't attempt to perform any validation on the 2nd byte.
                * Although all known ASL compilers insert a zero for the 2nd
                * byte, it can also be a checksum (as per the ACPI spec),
                * and this is occasionally seen in the field. July 2017.
                */
   
               /* Return the pointer to the EndTag if requested */
   
               if (!UserFunction)
               {
                   *Context = Aml;
               }
   
               /* Normal exit */
   
               return_ACPI_STATUS (AE_OK);
           }
   
           Aml += Length;
           Offset += Length;
       }
   
       /* Did not find an EndTag descriptor */
   
       if (UserFunction)
       {
           /* Insert an EndTag anyway. AcpiRsGetListLength always leaves room */
   
           (void) AcpiUtValidateResource (WalkState, EndTag, &ResourceIndex);
           Status = UserFunction (EndTag, 2, Offset, ResourceIndex, Context);
           if (ACPI_FAILURE (Status))
           {
               return_ACPI_STATUS (Status);
           }
       }
   
       return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiUtValidateResource
    *
    * PARAMETERS:  WalkState           - Current walk info
    *              Aml                 - Pointer to the raw AML resource descriptor
    *              ReturnIndex         - Where the resource index is returned. NULL
    *                                    if the index is not required.
    *
    * RETURN:      Status, and optionally the Index into the global resource tables
    *
    * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
    *              Type and Resource Length. Returns an index into the global
    *              resource information/dispatch tables for later use.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiUtValidateResource (
       ACPI_WALK_STATE         *WalkState,
       void                    *Aml,
       UINT8                   *ReturnIndex)
   {
       AML_RESOURCE            *AmlResource;
       UINT8                   ResourceType;
       UINT8                   ResourceIndex;
       ACPI_RS_LENGTH          ResourceLength;
       ACPI_RS_LENGTH          MinimumResourceLength;
   
   
       ACPI_FUNCTION_ENTRY ();
   
   
       /*
        * 1) Validate the ResourceType field (Byte 0)
        */
       ResourceType = ACPI_GET8 (Aml);
   
       /*
        * Byte 0 contains the descriptor name (Resource Type)
        * Examine the large/small bit in the resource header
        */
       if (ResourceType & ACPI_RESOURCE_NAME_LARGE)
       {
           /* Verify the large resource type (name) against the max */
   
           if (ResourceType > ACPI_RESOURCE_NAME_LARGE_MAX)
           {
               goto InvalidResource;
           }
   
           /*
            * Large Resource Type -- bits 6:0 contain the name
            * Translate range 0x80-0x8B to index range 0x10-0x1B
            */
           ResourceIndex = (UINT8) (ResourceType - 0x70);
       }
       else
       {
           /*
            * Small Resource Type -- bits 6:3 contain the name
            * Shift range to index range 0x00-0x0F
            */
           ResourceIndex = (UINT8)
               ((ResourceType & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
       }
   
       /*
        * Check validity of the resource type, via AcpiGbl_ResourceTypes.
        * Zero indicates an invalid resource.
        */
       if (!AcpiGbl_ResourceTypes[ResourceIndex])
       {
           goto InvalidResource;
       }
   
       /*
        * Validate the ResourceLength field. This ensures that the length
        * is at least reasonable, and guarantees that it is non-zero.
        */
       ResourceLength = AcpiUtGetResourceLength (Aml);
       MinimumResourceLength = AcpiGbl_ResourceAmlSizes[ResourceIndex];
   
       /* Validate based upon the type of resource - fixed length or variable */
   
       switch (AcpiGbl_ResourceTypes[ResourceIndex])
       {
       case ACPI_FIXED_LENGTH:
   
           /* Fixed length resource, length must match exactly */
   
           if (ResourceLength != MinimumResourceLength)
           {
               goto BadResourceLength;
           }
           break;
   
       case ACPI_VARIABLE_LENGTH:
   
           /* Variable length resource, length must be at least the minimum */
   
           if (ResourceLength < MinimumResourceLength)
           {
               goto BadResourceLength;
           }
           break;
   
       case ACPI_SMALL_VARIABLE_LENGTH:
   
           /* Small variable length resource, length can be (Min) or (Min-1) */
   
           if ((ResourceLength > MinimumResourceLength) ||
               (ResourceLength < (MinimumResourceLength - 1)))
           {
               goto BadResourceLength;
           }
           break;
   
       default:
   
           /* Shouldn't happen (because of validation earlier), but be sure */
   
           goto InvalidResource;
       }
   
       AmlResource = ACPI_CAST_PTR (AML_RESOURCE, Aml);
       if (ResourceType == ACPI_RESOURCE_NAME_SERIAL_BUS)
       {
           /* Validate the BusType field */
   
           if ((AmlResource->CommonSerialBus.Type == 0) ||
               (AmlResource->CommonSerialBus.Type > AML_RESOURCE_MAX_SERIALBUSTYPE))
           {
               if (WalkState)
               {
                   ACPI_ERROR ((AE_INFO,
                       "Invalid/unsupported SerialBus resource descriptor: BusType 0x%2.2X",
                       AmlResource->CommonSerialBus.Type));
               }
               return (AE_AML_INVALID_RESOURCE_TYPE);
           }
       }
   
       /* Optionally return the resource table index */
   
       if (ReturnIndex)
       {
           *ReturnIndex = ResourceIndex;
       }
   
       return (AE_OK);
   
   
   InvalidResource:
   
       if (WalkState)
       {
           ACPI_ERROR ((AE_INFO,
               "Invalid/unsupported resource descriptor: Type 0x%2.2X",
               ResourceType));
       }
       return (AE_AML_INVALID_RESOURCE_TYPE);
   
   BadResourceLength:
   
       if (WalkState)
       {
           ACPI_ERROR ((AE_INFO,
               "Invalid resource descriptor length: Type "
               "0x%2.2X, Length 0x%4.4X, MinLength 0x%4.4X",
               ResourceType, ResourceLength, MinimumResourceLength));
       }
       return (AE_AML_BAD_RESOURCE_LENGTH);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiUtGetResourceType
    *
    * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
    *
    * RETURN:      The Resource Type with no extraneous bits (except the
    *              Large/Small descriptor bit -- this is left alone)
    *
    * DESCRIPTION: Extract the Resource Type/Name from the first byte of
    *              a resource descriptor.
    *
    ******************************************************************************/
   
   UINT8
   AcpiUtGetResourceType (
       void                    *Aml)
   {
       ACPI_FUNCTION_ENTRY ();
   
   
       /*
        * Byte 0 contains the descriptor name (Resource Type)
        * Examine the large/small bit in the resource header
        */
       if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
       {
           /* Large Resource Type -- bits 6:0 contain the name */
   
           return (ACPI_GET8 (Aml));
       }
       else
       {
           /* Small Resource Type -- bits 6:3 contain the name */
   
           return ((UINT8) (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
       }
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiUtGetResourceLength
    *
    * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
    *
    * RETURN:      Byte Length
    *
    * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
    *              definition, this does not include the size of the descriptor
    *              header or the length field itself.
    *
    ******************************************************************************/
   
   UINT16
   AcpiUtGetResourceLength (
       void                    *Aml)
   {
       ACPI_RS_LENGTH          ResourceLength;
   
   
       ACPI_FUNCTION_ENTRY ();
   
   
       /*
        * Byte 0 contains the descriptor name (Resource Type)
        * Examine the large/small bit in the resource header
        */
       if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
       {
           /* Large Resource type -- bytes 1-2 contain the 16-bit length */
   
           ACPI_MOVE_16_TO_16 (&ResourceLength, ACPI_ADD_PTR (UINT8, Aml, 1));
   
       }
       else
       {
           /* Small Resource type -- bits 2:0 of byte 0 contain the length */
   
           ResourceLength = (UINT16) (ACPI_GET8 (Aml) &
               ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
       }
   
       return (ResourceLength);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiUtGetResourceHeaderLength
    *
    * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
    *
    * RETURN:      Length of the AML header (depends on large/small descriptor)
    *
    * DESCRIPTION: Get the length of the header for this resource.
    *
    ******************************************************************************/
   
   UINT8
   AcpiUtGetResourceHeaderLength (
       void                    *Aml)
   {
       ACPI_FUNCTION_ENTRY ();
   
   
       /* Examine the large/small bit in the resource header */
   
       if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
       {
           return (sizeof (AML_RESOURCE_LARGE_HEADER));
       }
       else
       {
           return (sizeof (AML_RESOURCE_SMALL_HEADER));
       }
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiUtGetDescriptorLength
    *
    * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
    *
    * RETURN:      Byte length
    *
    * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
    *              length of the descriptor header and the length field itself.
    *              Used to walk descriptor lists.
    *
    ******************************************************************************/
   
   UINT32
   AcpiUtGetDescriptorLength (
       void                    *Aml)
   {
       ACPI_FUNCTION_ENTRY ();
   
   
       /*
        * Get the Resource Length (does not include header length) and add
        * the header length (depends on if this is a small or large resource)
        */
       return (AcpiUtGetResourceLength (Aml) +
           AcpiUtGetResourceHeaderLength (Aml));
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiUtGetResourceEndTag
    *
    * PARAMETERS:  ObjDesc         - The resource template buffer object
    *              EndTag          - Where the pointer to the EndTag is returned
    *
    * RETURN:      Status, pointer to the end tag
    *
    * DESCRIPTION: Find the EndTag resource descriptor in an AML resource template
    *              Note: allows a buffer length of zero.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiUtGetResourceEndTag (
       ACPI_OPERAND_OBJECT     *ObjDesc,
       UINT8                   **EndTag)
   {
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE (UtGetResourceEndTag);
   
   
       /* Allow a buffer length of zero */
   
       if (!ObjDesc->Buffer.Length)
       {
           *EndTag = ObjDesc->Buffer.Pointer;
           return_ACPI_STATUS (AE_OK);
       }
   
       /* Validate the template and get a pointer to the EndTag */
   
       Status = AcpiUtWalkAmlResources (NULL, ObjDesc->Buffer.Pointer,
           ObjDesc->Buffer.Length, NULL, (void **) EndTag);
   
       return_ACPI_STATUS (Status);
   }

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