rscalc.c

acpi tools for linux include acpiexec and acpixtract

                                &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;


        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;


    ACPI_FUNCTION_TRACE (RsGetListLength);


    *SizeNeeded = 0;
    EndAml = AmlBuffer + AmlBufferLength;

    /* Walk the list of AML resource descriptors */

    while (AmlBuffer < EndAml)
    {
        /* Validate the Resource Type and Resource Length */

        Status = AcpiUtValidateResource (AmlBuffer, &ResourceIndex);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }

        /* 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;
            break;


        case ACPI_RESOURCE_NAME_END_TAG:
            /*
             * End Tag:
             * This is the normal exit, add size of EndTag
             */
            *SizeNeeded += ACPI_RS_SIZE_MIN;
            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;


        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.
         */
        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\n",
            AcpiUtGetResourceType (AmlBuffer),
            AcpiUtGetDescriptorLength (AmlBuffer), BufferSize));

        /*
         * 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 sub-package */

        PackageElement = *TopObjectList;

        /*
         * 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 < 4 && !NameFound; TableIndex++)
        {
            if (*SubObjectList && /* Null object allowed */

                ((ACPI_TYPE_STRING ==
                    ACPI_GET_OBJECT_TYPE (*SubObjectList)) ||

                ((ACPI_TYPE_LOCAL_REFERENCE ==
                    ACPI_GET_OBJECT_TYPE (*SubObjectList)) &&

                    ((*SubObjectList)->Reference.Opcode ==
                        AML_INT_NAMEPATH_OP))))
            {
                NameFound = TRUE;
            }
            else
            {
                /* Look at the next element */

                SubObjectList++;
            }
        }

        TempSizeNeeded += (sizeof (ACPI_PCI_ROUTING_TABLE) - 4);

        /* Was a String type found? */

        if (NameFound)
        {
            if (ACPI_GET_OBJECT_TYPE (*SubObjectList) == 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);
}