rscreate.c

acpi tools for linux include acpiexec and acpixtract

    /* Validate/Allocate/Clear caller buffer */

    Status = AcpiUtInitializeBuffer (OutputBuffer, BufferSizeNeeded);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /*
     * Loop through the ACPI_INTERNAL_OBJECTS - Each object
     * should be a package that in turn contains an
     * ACPI_INTEGER Address, a UINT8 Pin, a Name and a UINT8 SourceIndex.
     */
    TopObjectList    = PackageObject->Package.Elements;
    NumberOfElements = PackageObject->Package.Count;
    Buffer           = OutputBuffer->Pointer;
    UserPrt          = ACPI_CAST_PTR (ACPI_PCI_ROUTING_TABLE, Buffer);

    for (Index = 0; Index < NumberOfElements; Index++)
    {
        /*
         * Point UserPrt past this current structure
         *
         * NOTE: On the first iteration, UserPrt->Length will
         * be zero because we cleared the return buffer earlier
         */
        Buffer += UserPrt->Length;
        UserPrt = ACPI_CAST_PTR (ACPI_PCI_ROUTING_TABLE, Buffer);

        /*
         * Fill in the Length field with the information we have at this point.
         * The minus four is to subtract the size of the UINT8 Source[4] member
         * because it is added below.
         */
        UserPrt->Length = (sizeof (ACPI_PCI_ROUTING_TABLE) - 4);

        /* Each element of the top-level package must also be a package */

        if (ACPI_GET_OBJECT_TYPE (*TopObjectList) != ACPI_TYPE_PACKAGE)
        {
            ACPI_ERROR ((AE_INFO,
                "(PRT[%X]) Need sub-package, found %s",
                Index, AcpiUtGetObjectTypeName (*TopObjectList)));
            return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
        }

        /* Each sub-package must be of length 4 */

        if ((*TopObjectList)->Package.Count != 4)
        {
            ACPI_ERROR ((AE_INFO,
                "(PRT[%X]) Need package of length 4, found length %d",
                Index, (*TopObjectList)->Package.Count));
            return_ACPI_STATUS (AE_AML_PACKAGE_LIMIT);
        }

        /*
         * Dereference the sub-package.
         * The SubObjectList will now point to an array of the four IRQ
         * elements: [Address, Pin, Source, SourceIndex]
         */
        SubObjectList = (*TopObjectList)->Package.Elements;

        /* 1) First subobject: Dereference the PRT.Address */

        ObjDesc = SubObjectList[0];
        if (ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_INTEGER)
        {
            UserPrt->Address = ObjDesc->Integer.Value;
        }
        else
        {
            ACPI_ERROR ((AE_INFO,
                "(PRT[%X].Address) Need Integer, found %s",
                Index, AcpiUtGetObjectTypeName (ObjDesc)));
            return_ACPI_STATUS (AE_BAD_DATA);
        }

        /* 2) Second subobject: Dereference the PRT.Pin */

        ObjDesc = SubObjectList[1];
        if (ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_INTEGER)
        {
            UserPrt->Pin = (UINT32) ObjDesc->Integer.Value;
        }
        else
        {
            ACPI_ERROR ((AE_INFO,
                "(PRT[%X].Pin) Need Integer, found %s",
                Index, AcpiUtGetObjectTypeName (ObjDesc)));
            return_ACPI_STATUS (AE_BAD_DATA);
        }

        /*
         * 3) Third subobject: Dereference the PRT.SourceName
         * The name may be unresolved (slack mode), so allow a null object
         */
        ObjDesc = SubObjectList[2];
        if (ObjDesc)
        {
            switch (ACPI_GET_OBJECT_TYPE (ObjDesc))
            {
            case ACPI_TYPE_LOCAL_REFERENCE:

                if (ObjDesc->Reference.Opcode != AML_INT_NAMEPATH_OP)
                {
                    ACPI_ERROR ((AE_INFO,
                        "(PRT[%X].Source) Need name, found reference op %X",
                        Index, ObjDesc->Reference.Opcode));
                    return_ACPI_STATUS (AE_BAD_DATA);
                }

                Node = ObjDesc->Reference.Node;

                /* Use *remaining* length of the buffer as max for pathname */

                PathBuffer.Length = OutputBuffer->Length -
                                    (UINT32) ((UINT8 *) UserPrt->Source -
                                    (UINT8 *) OutputBuffer->Pointer);
                PathBuffer.Pointer = UserPrt->Source;

                Status = AcpiNsHandleToPathname ((ACPI_HANDLE) Node, &PathBuffer);

                /* +1 to include null terminator */

                UserPrt->Length += (UINT32) ACPI_STRLEN (UserPrt->Source) + 1;
                break;


            case ACPI_TYPE_STRING:

                ACPI_STRCPY (UserPrt->Source, ObjDesc->String.Pointer);

                /*
                 * Add to the Length field the length of the string
                 * (add 1 for terminator)
                 */
                UserPrt->Length += ObjDesc->String.Length + 1;
                break;


            case ACPI_TYPE_INTEGER:
                /*
                 * If this is a number, then the Source Name is NULL, since the
                 * entire buffer was zeroed out, we can leave this alone.
                 *
                 * Add to the Length field the length of the UINT32 NULL
                 */
                UserPrt->Length += sizeof (UINT32);
                break;


            default:

               ACPI_ERROR ((AE_INFO,
                   "(PRT[%X].Source) Need Ref/String/Integer, found %s",
                   Index, AcpiUtGetObjectTypeName (ObjDesc)));
               return_ACPI_STATUS (AE_BAD_DATA);
            }
        }

        /* Now align the current length */

        UserPrt->Length = (UINT32) ACPI_ROUND_UP_TO_64BIT (UserPrt->Length);

        /* 4) Fourth subobject: Dereference the PRT.SourceIndex */

        ObjDesc = SubObjectList[3];
        if (ACPI_GET_OBJECT_TYPE (ObjDesc) == ACPI_TYPE_INTEGER)
        {
            UserPrt->SourceIndex = (UINT32) ObjDesc->Integer.Value;
        }
        else
        {
            ACPI_ERROR ((AE_INFO,
                "(PRT[%X].SourceIndex) Need Integer, found %s",
                Index, AcpiUtGetObjectTypeName (ObjDesc)));
            return_ACPI_STATUS (AE_BAD_DATA);
        }

        /* Point to the next ACPI_OPERAND_OBJECT in the top level package */

        TopObjectList++;
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
            OutputBuffer->Pointer, (UINT32) OutputBuffer->Length));
    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiRsCreateAmlResources
 *
 * PARAMETERS:  LinkedListBuffer        - Pointer to the resource linked list
 *              OutputBuffer            - Pointer to the user's buffer
 *
 * RETURN:      Status  AE_OK if okay, else a valid ACPI_STATUS code.
 *              If the OutputBuffer is too small, the error will be
 *              AE_BUFFER_OVERFLOW and OutputBuffer->Length will point
 *              to the size buffer needed.
 *
 * DESCRIPTION: Takes the linked list of device resources and
 *              creates a bytestream to be used as input for the
 *              _SRS control method.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiRsCreateAmlResources (
    ACPI_RESOURCE           *LinkedListBuffer,
    ACPI_BUFFER             *OutputBuffer)
{
    ACPI_STATUS             Status;
    ACPI_SIZE               AmlSizeNeeded = 0;


    ACPI_FUNCTION_TRACE (RsCreateAmlResources);


    ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "LinkedListBuffer = %p\n",
        LinkedListBuffer));

    /*
     * Params already validated, so we don't re-validate here
     *
     * Pass the LinkedListBuffer into a module that calculates
     * the buffer size needed for the byte stream.
     */
    Status = AcpiRsGetAmlLength (LinkedListBuffer,
                &AmlSizeNeeded);

    ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "AmlSizeNeeded=%X, %s\n",
        (UINT32) AmlSizeNeeded, AcpiFormatException (Status)));
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Validate/Allocate/Clear caller buffer */

    Status = AcpiUtInitializeBuffer (OutputBuffer, AmlSizeNeeded);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    /* Do the conversion */

    Status = AcpiRsConvertResourcesToAml (LinkedListBuffer, AmlSizeNeeded,
                    OutputBuffer->Pointer);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
            OutputBuffer->Pointer, (UINT32) OutputBuffer->Length));
    return_ACPI_STATUS (AE_OK);
}