rscalc.c

acpi tools for linux include acpiexec and acpixtract

/*******************************************************************************
 *
 * Module Name: rscalc - Calculate stream and list lengths
 *              $Revision: 1.83 $
 *
 ******************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2008, 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.
 *
 *****************************************************************************/

#define __RSCALC_C__

#include "acpi.h"
#include "acresrc.h"
#include "amlcode.h"
#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)
{
    ACPI_NATIVE_UINT        BitsSet;


    ACPI_FUNCTION_ENTRY ();


    for (BitsSet = 0; BitField; BitsSet++)
    {
        /* Zero the least significant bit that is set */

        BitField &= (UINT16) (BitField - 1);
    }

    return ((UINT8) 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
 *              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               *SizeNeeded)
{
    ACPI_SIZE               AmlSizeNeeded = 0;
    ACPI_RS_LENGTH          TotalSize;


    ACPI_FUNCTION_TRACE (RsGetAmlLength);


    /* Traverse entire list of internal resource descriptors */

    while (Resource)
    {
        /* Validate the descriptor type */

        if (Resource->Type > ACPI_RESOURCE_TYPE_MAX)
        {
            return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
        }

        /* 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:

            if (Resource->Data.Irq.DescriptorLength == 2)
            {
                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 (