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

     /*******************************************************************************
      *
      * Module Name: rscalc - Calculate stream and list lengths
      *
      ******************************************************************************/
     
     /******************************************************************************
      *
      * 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>
   #include <contrib/dev/acpica/include/acnamesp.h>
   
   
   #define _COMPONENT          ACPI_RESOURCES
           ACPI_MODULE_NAME    ("rscalc")
   
   
   /* Local prototypes */
   
   static UINT8
   AcpiRsCountSetBits (
       UINT16                  BitField);
   
   static ACPI_RS_LENGTH
   AcpiRsStructOptionLength (
       ACPI_RESOURCE_SOURCE    *ResourceSource);
   
   static UINT32
   AcpiRsStreamOptionLength (
       UINT32                  ResourceLength,
       UINT32                  MinimumTotalLength);
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsCountSetBits
    *
    * PARAMETERS:  BitField        - Field in which to count bits
    *
    * RETURN:      Number of bits set within the field
    *
    * DESCRIPTION: Count the number of bits set in a resource field. Used for
    *              (Short descriptor) interrupt and DMA lists.
    *
    ******************************************************************************/
   
   static UINT8
   AcpiRsCountSetBits (
       UINT16                  BitField)
   {
       UINT8                   BitsSet;
   
   
       ACPI_FUNCTION_ENTRY ();
   
   
       for (BitsSet = 0; BitField; BitsSet++)
       {
           /* Zero the least significant bit that is set */
   
           BitField &= (UINT16) (BitField - 1);
       }
   
       return (BitsSet);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsStructOptionLength
    *
    * PARAMETERS:  ResourceSource      - Pointer to optional descriptor field
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Common code to handle optional ResourceSourceIndex and
    *              ResourceSource fields in some Large descriptors. Used during
    *              list-to-stream conversion
    *
    ******************************************************************************/
   
   static ACPI_RS_LENGTH
   AcpiRsStructOptionLength (
       ACPI_RESOURCE_SOURCE    *ResourceSource)
   {
       ACPI_FUNCTION_ENTRY ();
   
   
       /*
        * If the ResourceSource string is valid, return the size of the string
        * (StringLength includes the NULL terminator) plus the size of the
        * ResourceSourceIndex (1).
        */
       if (ResourceSource->StringPtr)
       {
           return ((ACPI_RS_LENGTH) (ResourceSource->StringLength + 1));
       }
   
       return (0);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsStreamOptionLength
    *
    * PARAMETERS:  ResourceLength      - Length from the resource header
    *              MinimumTotalLength  - Minimum length of this resource, before
    *                                    any optional fields. Includes header size
    *
    * RETURN:      Length of optional string (0 if no string present)
    *
    * DESCRIPTION: Common code to handle optional ResourceSourceIndex and
    *              ResourceSource fields in some Large descriptors. Used during
    *              stream-to-list conversion
    *
    ******************************************************************************/
   
   static UINT32
   AcpiRsStreamOptionLength (
       UINT32                  ResourceLength,
       UINT32                  MinimumAmlResourceLength)
   {
       UINT32                  StringLength = 0;
   
   
       ACPI_FUNCTION_ENTRY ();
   
   
       /*
        * The ResourceSourceIndex and ResourceSource are optional elements of
        * some Large-type resource descriptors.
        */
   
       /*
        * If the length of the actual resource descriptor is greater than the
        * ACPI spec-defined minimum length, it means that a ResourceSourceIndex
        * exists and is followed by a (required) null terminated string. The
        * string length (including the null terminator) is the resource length
        * minus the minimum length, minus one byte for the ResourceSourceIndex
        * itself.
        */
       if (ResourceLength > MinimumAmlResourceLength)
       {
           /* Compute the length of the optional string */
   
           StringLength = ResourceLength - MinimumAmlResourceLength - 1;
       }
   
       /*
        * Round the length up to a multiple of the native word in order to
        * guarantee that the entire resource descriptor is native word aligned
        */
       return ((UINT32) ACPI_ROUND_UP_TO_NATIVE_WORD (StringLength));
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsGetAmlLength
    *
    * PARAMETERS:  Resource            - Pointer to the resource linked list
    *              ResourceListSize    - Size of the resource linked list
    *              SizeNeeded          - Where the required size is returned
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Takes a linked list of internal resource descriptors and
    *              calculates the size buffer needed to hold the corresponding
    *              external resource byte stream.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiRsGetAmlLength (
       ACPI_RESOURCE           *Resource,
       ACPI_SIZE               ResourceListSize,
       ACPI_SIZE               *SizeNeeded)
   {
       ACPI_SIZE               AmlSizeNeeded = 0;
       ACPI_RESOURCE           *ResourceEnd;
       ACPI_RS_LENGTH          TotalSize;
   
   
       ACPI_FUNCTION_TRACE (RsGetAmlLength);
   
   
       /* Traverse entire list of internal resource descriptors */
   
       ResourceEnd = ACPI_ADD_PTR (ACPI_RESOURCE, Resource, ResourceListSize);
       while (Resource < ResourceEnd)
       {
           /* Validate the descriptor type */
   
           if (Resource->Type > ACPI_RESOURCE_TYPE_MAX)
           {
               return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
           }
   
           /* Sanity check the length. It must not be zero, or we loop forever */
   
           if (!Resource->Length)
           {
               return_ACPI_STATUS (AE_AML_BAD_RESOURCE_LENGTH);
           }
   
           /* Get the base size of the (external stream) resource descriptor */
   
           TotalSize = AcpiGbl_AmlResourceSizes [Resource->Type];
   
           /*
            * Augment the base size for descriptors with optional and/or
            * variable-length fields
            */
           switch (Resource->Type)
           {
           case ACPI_RESOURCE_TYPE_IRQ:
   
               /* Length can be 3 or 2 */
   
               if (Resource->Data.Irq.DescriptorLength == 2)
               {
                   TotalSize--;
               }
               break;
   
   
           case ACPI_RESOURCE_TYPE_START_DEPENDENT:
   
               /* Length can be 1 or 0 */
   
               if (Resource->Data.Irq.DescriptorLength == 0)
               {
                   TotalSize--;
               }
               break;
   
   
           case ACPI_RESOURCE_TYPE_VENDOR:
               /*
                * Vendor Defined Resource:
                * For a Vendor Specific resource, if the Length is between 1 and 7
                * it will be created as a Small Resource data type, otherwise it
                * is a Large Resource data type.
                */
               if (Resource->Data.Vendor.ByteLength > 7)
               {
                   /* Base size of a Large resource descriptor */
   
                   TotalSize = sizeof (AML_RESOURCE_LARGE_HEADER);
               }
   
               /* Add the size of the vendor-specific data */
   
               TotalSize = (ACPI_RS_LENGTH)
                   (TotalSize + Resource->Data.Vendor.ByteLength);
               break;
   
   
           case ACPI_RESOURCE_TYPE_END_TAG:
               /*
                * End Tag:
                * We are done -- return the accumulated total size.
                */
               *SizeNeeded = AmlSizeNeeded + TotalSize;
   
               /* Normal exit */
   
               return_ACPI_STATUS (AE_OK);
   
   
           case ACPI_RESOURCE_TYPE_ADDRESS16:
               /*
                * 16-Bit Address Resource:
                * Add the size of the optional ResourceSource info
                */
               TotalSize = (ACPI_RS_LENGTH) (TotalSize +
                   AcpiRsStructOptionLength (
                       &Resource->Data.Address16.ResourceSource));
               break;
   
   
           case ACPI_RESOURCE_TYPE_ADDRESS32:
               /*
                * 32-Bit Address Resource:
                * Add the size of the optional ResourceSource info
                */
               TotalSize = (ACPI_RS_LENGTH) (TotalSize +
                   AcpiRsStructOptionLength (
                       &Resource->Data.Address32.ResourceSource));
               break;
   
   
           case ACPI_RESOURCE_TYPE_ADDRESS64:
               /*
                * 64-Bit Address Resource:
                * Add the size of the optional ResourceSource info
                */
               TotalSize = (ACPI_RS_LENGTH) (TotalSize +
                   AcpiRsStructOptionLength (
                       &Resource->Data.Address64.ResourceSource));
               break;
   
   
           case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
               /*
                * Extended IRQ Resource:
                * Add the size of each additional optional interrupt beyond the
                * required 1 (4 bytes for each UINT32 interrupt number)
                */
               TotalSize = (ACPI_RS_LENGTH) (TotalSize +
                   ((Resource->Data.ExtendedIrq.InterruptCount - 1) * 4) +
   
                   /* Add the size of the optional ResourceSource info */
   
                   AcpiRsStructOptionLength (
                       &Resource->Data.ExtendedIrq.ResourceSource));
               break;
   
   
           case ACPI_RESOURCE_TYPE_GPIO:
   
               TotalSize = (ACPI_RS_LENGTH) (TotalSize +
                   (Resource->Data.Gpio.PinTableLength * 2) +
                   Resource->Data.Gpio.ResourceSource.StringLength +
                   Resource->Data.Gpio.VendorLength);
   
               break;
   
           case ACPI_RESOURCE_TYPE_PIN_FUNCTION:
   
               TotalSize = (ACPI_RS_LENGTH) (TotalSize +
                   (Resource->Data.PinFunction.PinTableLength * 2) +
                   Resource->Data.PinFunction.ResourceSource.StringLength +
                   Resource->Data.PinFunction.VendorLength);
   
               break;
   
   
           case ACPI_RESOURCE_TYPE_SERIAL_BUS:
   
               TotalSize = AcpiGbl_AmlResourceSerialBusSizes [
                   Resource->Data.CommonSerialBus.Type];
   
               TotalSize = (ACPI_RS_LENGTH) (TotalSize +
                   Resource->Data.I2cSerialBus.ResourceSource.StringLength +
                   Resource->Data.I2cSerialBus.VendorLength);
   
               break;
   
           case ACPI_RESOURCE_TYPE_PIN_CONFIG:
   
               TotalSize = (ACPI_RS_LENGTH) (TotalSize +
                   (Resource->Data.PinConfig.PinTableLength * 2) +
                   Resource->Data.PinConfig.ResourceSource.StringLength +
                   Resource->Data.PinConfig.VendorLength);
   
               break;
   
           case ACPI_RESOURCE_TYPE_PIN_GROUP:
   
               TotalSize = (ACPI_RS_LENGTH) (TotalSize +
                   (Resource->Data.PinGroup.PinTableLength * 2) +
                   Resource->Data.PinGroup.ResourceLabel.StringLength +
                   Resource->Data.PinGroup.VendorLength);
   
               break;
   
           case ACPI_RESOURCE_TYPE_PIN_GROUP_FUNCTION:
   
               TotalSize = (ACPI_RS_LENGTH) (TotalSize +
                   Resource->Data.PinGroupFunction.ResourceSource.StringLength +
                   Resource->Data.PinGroupFunction.ResourceSourceLabel.StringLength +
                   Resource->Data.PinGroupFunction.VendorLength);
   
               break;
   
           case ACPI_RESOURCE_TYPE_PIN_GROUP_CONFIG:
   
               TotalSize = (ACPI_RS_LENGTH) (TotalSize +
                   Resource->Data.PinGroupConfig.ResourceSource.StringLength +
                   Resource->Data.PinGroupConfig.ResourceSourceLabel.StringLength +
                   Resource->Data.PinGroupConfig.VendorLength);
   
               break;
   
           default:
   
               break;
           }
   
           /* Update the total */
   
           AmlSizeNeeded += TotalSize;
   
           /* Point to the next object */
   
           Resource = ACPI_ADD_PTR (ACPI_RESOURCE, Resource, Resource->Length);
       }
   
       /* Did not find an EndTag resource descriptor */
   
       return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsGetListLength
    *
    * PARAMETERS:  AmlBuffer           - Pointer to the resource byte stream
    *              AmlBufferLength     - Size of AmlBuffer
    *              SizeNeeded          - Where the size needed is returned
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Takes an external resource byte stream and calculates the size
    *              buffer needed to hold the corresponding internal resource
    *              descriptor linked list.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiRsGetListLength (
       UINT8                   *AmlBuffer,
       UINT32                  AmlBufferLength,
       ACPI_SIZE               *SizeNeeded)
   {
       ACPI_STATUS             Status;
       UINT8                   *EndAml;
       UINT8                   *Buffer;
       UINT32                  BufferSize;
       UINT16                  Temp16;
       UINT16                  ResourceLength;
       UINT32                  ExtraStructBytes;
       UINT8                   ResourceIndex;
       UINT8                   MinimumAmlResourceLength;
       AML_RESOURCE            *AmlResource;
   
   
       ACPI_FUNCTION_TRACE (RsGetListLength);
   
   
       *SizeNeeded = ACPI_RS_SIZE_MIN;         /* Minimum size is one EndTag */
       EndAml = AmlBuffer + AmlBufferLength;
   
       /* Walk the list of AML resource descriptors */
   
       while (AmlBuffer < EndAml)
       {
           /* Validate the Resource Type and Resource Length */
   
           Status = AcpiUtValidateResource (NULL, AmlBuffer, &ResourceIndex);
           if (ACPI_FAILURE (Status))
           {
               /*
                * Exit on failure. Cannot continue because the descriptor length
                * may be bogus also.
                */
               return_ACPI_STATUS (Status);
           }
   
           AmlResource = (void *) AmlBuffer;
   
           /* Get the resource length and base (minimum) AML size */
   
           ResourceLength = AcpiUtGetResourceLength (AmlBuffer);
           MinimumAmlResourceLength = AcpiGbl_ResourceAmlSizes[ResourceIndex];
   
           /*
            * Augment the size for descriptors with optional
            * and/or variable length fields
            */
           ExtraStructBytes = 0;
           Buffer = AmlBuffer + AcpiUtGetResourceHeaderLength (AmlBuffer);
   
           switch (AcpiUtGetResourceType (AmlBuffer))
           {
           case ACPI_RESOURCE_NAME_IRQ:
               /*
                * IRQ Resource:
                * Get the number of bits set in the 16-bit IRQ mask
                */
               ACPI_MOVE_16_TO_16 (&Temp16, Buffer);
               ExtraStructBytes = AcpiRsCountSetBits (Temp16);
               break;
   
   
           case ACPI_RESOURCE_NAME_DMA:
               /*
                * DMA Resource:
                * Get the number of bits set in the 8-bit DMA mask
                */
               ExtraStructBytes = AcpiRsCountSetBits (*Buffer);
               break;
   
   
           case ACPI_RESOURCE_NAME_VENDOR_SMALL:
           case ACPI_RESOURCE_NAME_VENDOR_LARGE:
               /*
                * Vendor Resource:
                * Get the number of vendor data bytes
                */
               ExtraStructBytes = ResourceLength;
   
               /*
                * There is already one byte included in the minimum
                * descriptor size. If there are extra struct bytes,
                * subtract one from the count.
                */
               if (ExtraStructBytes)
               {
                   ExtraStructBytes--;
               }
               break;
   
   
           case ACPI_RESOURCE_NAME_END_TAG:
               /*
                * End Tag: This is the normal exit
                */
               return_ACPI_STATUS (AE_OK);
   
   
           case ACPI_RESOURCE_NAME_ADDRESS32:
           case ACPI_RESOURCE_NAME_ADDRESS16:
           case ACPI_RESOURCE_NAME_ADDRESS64:
               /*
                * Address Resource:
                * Add the size of the optional ResourceSource
                */
               ExtraStructBytes = AcpiRsStreamOptionLength (
                   ResourceLength, MinimumAmlResourceLength);
               break;
   
   
           case ACPI_RESOURCE_NAME_EXTENDED_IRQ:
               /*
                * Extended IRQ Resource:
                * Using the InterruptTableLength, add 4 bytes for each additional
                * interrupt. Note: at least one interrupt is required and is
                * included in the minimum descriptor size (reason for the -1)
                */
               ExtraStructBytes = (Buffer[1] - 1) * sizeof (UINT32);
   
               /* Add the size of the optional ResourceSource */
   
               ExtraStructBytes += AcpiRsStreamOptionLength (
                   ResourceLength - ExtraStructBytes, MinimumAmlResourceLength);
               break;
   
           case ACPI_RESOURCE_NAME_GPIO:
   
               /* Vendor data is optional */
   
               if (AmlResource->Gpio.VendorLength)
               {
                   ExtraStructBytes +=
                       AmlResource->Gpio.VendorOffset -
                       AmlResource->Gpio.PinTableOffset +
                       AmlResource->Gpio.VendorLength;
               }
               else
               {
                   ExtraStructBytes +=
                       AmlResource->LargeHeader.ResourceLength +
                       sizeof (AML_RESOURCE_LARGE_HEADER) -
                       AmlResource->Gpio.PinTableOffset;
               }
               break;
   
           case ACPI_RESOURCE_NAME_PIN_FUNCTION:
   
               /* Vendor data is optional */
   
               if (AmlResource->PinFunction.VendorLength)
               {
                   ExtraStructBytes +=
                       AmlResource->PinFunction.VendorOffset -
                       AmlResource->PinFunction.PinTableOffset +
                       AmlResource->PinFunction.VendorLength;
               }
               else
               {
                   ExtraStructBytes +=
                       AmlResource->LargeHeader.ResourceLength +
                       sizeof (AML_RESOURCE_LARGE_HEADER) -
                       AmlResource->PinFunction.PinTableOffset;
               }
               break;
   
           case ACPI_RESOURCE_NAME_SERIAL_BUS:
   
               MinimumAmlResourceLength = AcpiGbl_ResourceAmlSerialBusSizes[
                   AmlResource->CommonSerialBus.Type];
               ExtraStructBytes +=
                   AmlResource->CommonSerialBus.ResourceLength -
                   MinimumAmlResourceLength;
               break;
   
           case ACPI_RESOURCE_NAME_PIN_CONFIG:
   
               /* Vendor data is optional */
   
               if (AmlResource->PinConfig.VendorLength)
               {
                   ExtraStructBytes +=
                       AmlResource->PinConfig.VendorOffset -
                       AmlResource->PinConfig.PinTableOffset +
                       AmlResource->PinConfig.VendorLength;
               }
               else
               {
                   ExtraStructBytes +=
                       AmlResource->LargeHeader.ResourceLength +
                       sizeof (AML_RESOURCE_LARGE_HEADER) -
                       AmlResource->PinConfig.PinTableOffset;
               }
               break;
   
           case ACPI_RESOURCE_NAME_PIN_GROUP:
   
               ExtraStructBytes +=
                   AmlResource->PinGroup.VendorOffset -
                   AmlResource->PinGroup.PinTableOffset +
                   AmlResource->PinGroup.VendorLength;
   
               break;
   
           case ACPI_RESOURCE_NAME_PIN_GROUP_FUNCTION:
   
               ExtraStructBytes +=
                   AmlResource->PinGroupFunction.VendorOffset -
                   AmlResource->PinGroupFunction.ResSourceOffset +
                   AmlResource->PinGroupFunction.VendorLength;
   
               break;
   
           case ACPI_RESOURCE_NAME_PIN_GROUP_CONFIG:
   
               ExtraStructBytes +=
                   AmlResource->PinGroupConfig.VendorOffset -
                   AmlResource->PinGroupConfig.ResSourceOffset +
                   AmlResource->PinGroupConfig.VendorLength;
   
               break;
   
           default:
   
               break;
           }
   
           /*
            * Update the required buffer size for the internal descriptor structs
            *
            * Important: Round the size up for the appropriate alignment. This
            * is a requirement on IA64.
            */
           if (AcpiUtGetResourceType (AmlBuffer) ==
               ACPI_RESOURCE_NAME_SERIAL_BUS)
           {
               BufferSize = AcpiGbl_ResourceStructSerialBusSizes[
                   AmlResource->CommonSerialBus.Type] + ExtraStructBytes;
           }
           else
           {
               BufferSize = AcpiGbl_ResourceStructSizes[ResourceIndex] +
                   ExtraStructBytes;
           }
   
           BufferSize = (UINT32) ACPI_ROUND_UP_TO_NATIVE_WORD (BufferSize);
           *SizeNeeded += BufferSize;
   
           ACPI_DEBUG_PRINT ((ACPI_DB_RESOURCES,
               "Type %.2X, AmlLength %.2X InternalLength %.2X%8X\n",
               AcpiUtGetResourceType (AmlBuffer),
               AcpiUtGetDescriptorLength (AmlBuffer), ACPI_FORMAT_UINT64(*SizeNeeded)));
   
           /*
            * Point to the next resource within the AML stream using the length
            * contained in the resource descriptor header
            */
           AmlBuffer += AcpiUtGetDescriptorLength (AmlBuffer);
       }
   
       /* Did not find an EndTag resource descriptor */
   
       return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRsGetPciRoutingTableLength
    *
    * PARAMETERS:  PackageObject           - Pointer to the package object
    *              BufferSizeNeeded        - UINT32 pointer of the size buffer
    *                                        needed to properly return the
    *                                        parsed data
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Given a package representing a PCI routing table, this
    *              calculates the size of the corresponding linked list of
    *              descriptions.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiRsGetPciRoutingTableLength (
       ACPI_OPERAND_OBJECT     *PackageObject,
       ACPI_SIZE               *BufferSizeNeeded)
   {
       UINT32                  NumberOfElements;
       ACPI_SIZE               TempSizeNeeded = 0;
       ACPI_OPERAND_OBJECT     **TopObjectList;
       UINT32                  Index;
       ACPI_OPERAND_OBJECT     *PackageElement;
       ACPI_OPERAND_OBJECT     **SubObjectList;
       BOOLEAN                 NameFound;
       UINT32                  TableIndex;
   
   
       ACPI_FUNCTION_TRACE (RsGetPciRoutingTableLength);
   
   
       NumberOfElements = PackageObject->Package.Count;
   
       /*
        * Calculate the size of the return buffer.
        * The base size is the number of elements * the sizes of the
        * structures. Additional space for the strings is added below.
        * The minus one is to subtract the size of the UINT8 Source[1]
        * member because it is added below.
        *
        * But each PRT_ENTRY structure has a pointer to a string and
        * the size of that string must be found.
        */
       TopObjectList = PackageObject->Package.Elements;
   
       for (Index = 0; Index < NumberOfElements; Index++)
       {
           /* Dereference the subpackage */
   
           PackageElement = *TopObjectList;
   
           /* We must have a valid Package object */
   
           if (!PackageElement ||
               (PackageElement->Common.Type != ACPI_TYPE_PACKAGE))
           {
               return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
           }
   
           /*
            * The SubObjectList will now point to an array of the
            * four IRQ elements: Address, Pin, Source and SourceIndex
            */
           SubObjectList = PackageElement->Package.Elements;
   
           /* Scan the IrqTableElements for the Source Name String */
   
           NameFound = FALSE;
   
           for (TableIndex = 0;
                TableIndex < PackageElement->Package.Count && !NameFound;
                TableIndex++)
           {
               if (*SubObjectList && /* Null object allowed */
   
                   ((ACPI_TYPE_STRING ==
                       (*SubObjectList)->Common.Type) ||
   
                   ((ACPI_TYPE_LOCAL_REFERENCE ==
                       (*SubObjectList)->Common.Type) &&
   
                       ((*SubObjectList)->Reference.Class ==
                           ACPI_REFCLASS_NAME))))
               {
                   NameFound = TRUE;
               }
               else
               {
                   /* Look at the next element */
   
                   SubObjectList++;
               }
           }
   
           TempSizeNeeded += (sizeof (ACPI_PCI_ROUTING_TABLE) - 4);
   
           /* Was a String type found? */
   
           if (NameFound)
           {
               if ((*SubObjectList)->Common.Type == ACPI_TYPE_STRING)
               {
                   /*
                    * The length String.Length field does not include the
                    * terminating NULL, add 1
                    */
                   TempSizeNeeded += ((ACPI_SIZE)
                       (*SubObjectList)->String.Length + 1);
               }
               else
               {
                   TempSizeNeeded += AcpiNsGetPathnameLength (
                       (*SubObjectList)->Reference.Node);
               }
           }
           else
           {
               /*
                * If no name was found, then this is a NULL, which is
                * translated as a UINT32 zero.
                */
               TempSizeNeeded += sizeof (UINT32);
           }
   
           /* Round up the size since each element must be aligned */
   
           TempSizeNeeded = ACPI_ROUND_UP_TO_64BIT (TempSizeNeeded);
   
           /* Point to the next ACPI_OPERAND_OBJECT */
   
           TopObjectList++;
       }
   
       /*
        * Add an extra element to the end of the list, essentially a
        * NULL terminator
        */
       *BufferSizeNeeded = TempSizeNeeded + sizeof (ACPI_PCI_ROUTING_TABLE);
       return_ACPI_STATUS (AE_OK);
   }

Cache object: ecba4db3ce0e2fecbc459f90381f6af7