components/namespace/nsxfname.c

/******************************************************************************
 *
 * Module Name: nsxfname - Public interfaces to the ACPI subsystem
 *                         ACPI Namespace oriented interfaces
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2009, 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 __NSXFNAME_C__

#include "acpi.h"
#include "accommon.h"
#include "acnamesp.h"
#include "acparser.h"
#include "amlcode.h"


#define _COMPONENT          ACPI_NAMESPACE
        ACPI_MODULE_NAME    ("nsxfname")


/******************************************************************************
 *
 * FUNCTION:    AcpiGetHandle
 *
 * PARAMETERS:  Parent          - Object to search under (search scope).
 *              Pathname        - Pointer to an asciiz string containing the
 *                                name
 *              RetHandle       - Where the return handle is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This routine will search for a caller specified name in the
 *              name space.  The caller can restrict the search region by
 *              specifying a non NULL parent.  The parent value is itself a
 *              namespace handle.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiGetHandle (
    ACPI_HANDLE             Parent,
    ACPI_STRING             Pathname,
    ACPI_HANDLE             *RetHandle)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node = NULL;
    ACPI_NAMESPACE_NODE     *PrefixNode = NULL;


    ACPI_FUNCTION_ENTRY ();


    /* Parameter Validation */

    if (!RetHandle || !Pathname)
    {
        return (AE_BAD_PARAMETER);
    }

    /* Convert a parent handle to a prefix node */

    if (Parent)
    {
        PrefixNode = AcpiNsMapHandleToNode (Parent);
        if (!PrefixNode)
        {
            return (AE_BAD_PARAMETER);
        }
    }

    /*
     * Valid cases are:
     * 1) Fully qualified pathname
     * 2) Parent + Relative pathname
     *
     * Error for <null Parent + relative path>
     */
    if (AcpiNsValidRootPrefix (Pathname[0]))
    {
        /* Pathname is fully qualified (starts with '\') */

        /* Special case for root-only, since we can't search for it */

        if (!ACPI_STRCMP (Pathname, ACPI_NS_ROOT_PATH))
        {
            *RetHandle = AcpiNsConvertEntryToHandle (AcpiGbl_RootNode);
            return (AE_OK);
        }
    }
    else if (!PrefixNode)
    {
        /* Relative path with null prefix is disallowed */

        return (AE_BAD_PARAMETER);
    }

    /* Find the Node and convert to a handle */

    Status = AcpiNsGetNode (PrefixNode, Pathname, ACPI_NS_NO_UPSEARCH, &Node);
    if (ACPI_SUCCESS (Status))
    {
        *RetHandle = AcpiNsConvertEntryToHandle (Node);
    }

    return (Status);
}

ACPI_EXPORT_SYMBOL (AcpiGetHandle)


/******************************************************************************
 *
 * FUNCTION:    AcpiGetName
 *
 * PARAMETERS:  Handle          - Handle to be converted to a pathname
 *              NameType        - Full pathname or single segment
 *              Buffer          - Buffer for returned path
 *
 * RETURN:      Pointer to a string containing the fully qualified Name.
 *
 * DESCRIPTION: This routine returns the fully qualified name associated with
 *              the Handle parameter.  This and the AcpiPathnameToHandle are
 *              complementary functions.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiGetName (
    ACPI_HANDLE             Handle,
    UINT32                  NameType,
    ACPI_BUFFER             *Buffer)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;


    /* Parameter validation */

    if (NameType > ACPI_NAME_TYPE_MAX)
    {
        return (AE_BAD_PARAMETER);
    }

    Status = AcpiUtValidateBuffer (Buffer);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    if (NameType == ACPI_FULL_PATHNAME)
    {
        /* Get the full pathname (From the namespace root) */

        Status = AcpiNsHandleToPathname (Handle, Buffer);
        return (Status);
    }

    /*
     * Wants the single segment ACPI name.
     * Validate handle and convert to a namespace Node
     */
    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    Node = AcpiNsMapHandleToNode (Handle);
    if (!Node)
    {
        Status = AE_BAD_PARAMETER;
        goto UnlockAndExit;
    }

    /* Validate/Allocate/Clear caller buffer */

    Status = AcpiUtInitializeBuffer (Buffer, ACPI_PATH_SEGMENT_LENGTH);
    if (ACPI_FAILURE (Status))
    {
        goto UnlockAndExit;
    }

    /* Just copy the ACPI name from the Node and zero terminate it */

    ACPI_STRNCPY (Buffer->Pointer, AcpiUtGetNodeName (Node),
                ACPI_NAME_SIZE);
    ((char *) Buffer->Pointer) [ACPI_NAME_SIZE] = 0;
    Status = AE_OK;


UnlockAndExit:

    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
    return (Status);
}

ACPI_EXPORT_SYMBOL (AcpiGetName)


/******************************************************************************
 *
 * FUNCTION:    AcpiGetObjectInfo
 *
 * PARAMETERS:  Handle          - Object Handle
 *              Buffer          - Where the info is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Returns information about an object as gleaned from the
 *              namespace node and possibly by running several standard
 *              control methods (Such as in the case of a device.)
 *
 ******************************************************************************/

ACPI_STATUS
AcpiGetObjectInfo (
    ACPI_HANDLE             Handle,
    ACPI_BUFFER             *Buffer)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_DEVICE_INFO        *Info;
    ACPI_DEVICE_INFO        *ReturnInfo;
    ACPI_COMPATIBLE_ID_LIST *CidList = NULL;
    ACPI_SIZE               Size;


    /* Parameter validation */

    if (!Handle || !Buffer)
    {
        return (AE_BAD_PARAMETER);
    }

    Status = AcpiUtValidateBuffer (Buffer);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_DEVICE_INFO));
    if (!Info)
    {
        return (AE_NO_MEMORY);
    }

    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
    if (ACPI_FAILURE (Status))
    {
        goto Cleanup;
    }

    Node = AcpiNsMapHandleToNode (Handle);
    if (!Node)
    {
        (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
        Status = AE_BAD_PARAMETER;
        goto Cleanup;
    }

    /* Init return structure */

    Size = sizeof (ACPI_DEVICE_INFO);

    Info->Type  = Node->Type;
    Info->Name  = Node->Name.Integer;
    Info->Valid = 0;

    if (Node->Type == ACPI_TYPE_METHOD)
    {
        Info->ParamCount = Node->Object->Method.ParamCount;
    }

    Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
    if (ACPI_FAILURE (Status))
    {
        goto Cleanup;
    }

    /* If not a device, we are all done */

    if (Info->Type == ACPI_TYPE_DEVICE)
    {
        /*
         * Get extra info for ACPI Devices objects only:
         * Run the Device _HID, _UID, _CID, _STA, _ADR and _SxD methods.
         *
         * Note: none of these methods are required, so they may or may
         * not be present for this device.  The Info->Valid bitfield is used
         * to indicate which methods were found and ran successfully.
         */

        /* Execute the Device._HID method */

        Status = AcpiUtExecute_HID (Node, &Info->HardwareId);
        if (ACPI_SUCCESS (Status))
        {
            Info->Valid |= ACPI_VALID_HID;
        }

        /* Execute the Device._UID method */

        Status = AcpiUtExecute_UID (Node, &Info->UniqueId);
        if (ACPI_SUCCESS (Status))
        {
            Info->Valid |= ACPI_VALID_UID;
        }

        /* Execute the Device._CID method */

        Status = AcpiUtExecute_CID (Node, &CidList);
        if (ACPI_SUCCESS (Status))
        {
            Size += CidList->Size;
            Info->Valid |= ACPI_VALID_CID;
        }

        /* Execute the Device._STA method */

        Status = AcpiUtExecute_STA (Node, &Info->CurrentStatus);
        if (ACPI_SUCCESS (Status))
        {
            Info->Valid |= ACPI_VALID_STA;
        }

        /* Execute the Device._ADR method */

        Status = AcpiUtEvaluateNumericObject (METHOD_NAME__ADR, Node,
                        &Info->Address);
        if (ACPI_SUCCESS (Status))
        {
            Info->Valid |= ACPI_VALID_ADR;
        }

        /* Execute the Device._SxD methods */

        Status = AcpiUtExecute_Sxds (Node, Info->HighestDstates);
        if (ACPI_SUCCESS (Status))
        {
            Info->Valid |= ACPI_VALID_SXDS;
        }
    }

    /* Validate/Allocate/Clear caller buffer */

    Status = AcpiUtInitializeBuffer (Buffer, Size);
    if (ACPI_FAILURE (Status))
    {
        goto Cleanup;
    }

    /* Populate the return buffer */

    ReturnInfo = Buffer->Pointer;
    ACPI_MEMCPY (ReturnInfo, Info, sizeof (ACPI_DEVICE_INFO));

    if (CidList)
    {
        ACPI_MEMCPY (&ReturnInfo->CompatibilityId, CidList, CidList->Size);
    }


Cleanup:
    ACPI_FREE (Info);
    if (CidList)
    {
        ACPI_FREE (CidList);
    }
    return (Status);
}

ACPI_EXPORT_SYMBOL (AcpiGetObjectInfo)


/******************************************************************************
 *
 * FUNCTION:    AcpiInstallMethod
 *
 * PARAMETERS:  Buffer         - An ACPI table containing one control method
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install a control method into the namespace. If the method
 *              name already exists in the namespace, it is overwritten. The
 *              input buffer must contain a valid DSDT or SSDT containing a
 *              single control method.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiInstallMethod (
    UINT8                   *Buffer)
{
    ACPI_TABLE_HEADER       *Table = ACPI_CAST_PTR (ACPI_TABLE_HEADER, Buffer);
    UINT8                   *AmlBuffer;
    UINT8                   *AmlStart;
    char                    *Path;
    ACPI_NAMESPACE_NODE     *Node;
    ACPI_OPERAND_OBJECT     *MethodObj;
    ACPI_PARSE_STATE        ParserState;
    UINT32                  AmlLength;
    UINT16                  Opcode;
    UINT8                   MethodFlags;
    ACPI_STATUS             Status;


    /* Parameter validation */

    if (!Buffer)
    {
        return (AE_BAD_PARAMETER);
    }

    /* Table must be a DSDT or SSDT */

    if (!ACPI_COMPARE_NAME (Table->Signature, ACPI_SIG_DSDT) &&
        !ACPI_COMPARE_NAME (Table->Signature, ACPI_SIG_SSDT))
    {
        return (AE_BAD_HEADER);
    }

    /* First AML opcode in the table must be a control method */

    ParserState.Aml = Buffer + sizeof (ACPI_TABLE_HEADER);
    Opcode = AcpiPsPeekOpcode (&ParserState);
    if (Opcode != AML_METHOD_OP)
    {
        return (AE_BAD_PARAMETER);
    }

    /* Extract method information from the raw AML */

    ParserState.Aml += AcpiPsGetOpcodeSize (Opcode);
    ParserState.PkgEnd = AcpiPsGetNextPackageEnd (&ParserState);
    Path = AcpiPsGetNextNamestring (&ParserState);
    MethodFlags = *ParserState.Aml++;
    AmlStart = ParserState.Aml;
    AmlLength = ACPI_PTR_DIFF (ParserState.PkgEnd, AmlStart);

    /*
     * Allocate resources up-front. We don't want to have to delete a new
     * node from the namespace if we cannot allocate memory.
     */
    AmlBuffer = ACPI_ALLOCATE (AmlLength);
    if (!AmlBuffer)
    {
        return (AE_NO_MEMORY);
    }

    MethodObj = AcpiUtCreateInternalObject (ACPI_TYPE_METHOD);
    if (!MethodObj)
    {
        ACPI_FREE (AmlBuffer);
        return (AE_NO_MEMORY);
    }

    /* Lock namespace for AcpiNsLookup, we may be creating a new node */

    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
    if (ACPI_FAILURE (Status))
    {
        goto ErrorExit;
    }

    /* The lookup either returns an existing node or creates a new one */

    Status = AcpiNsLookup (NULL, Path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1,
                ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND, NULL, &Node);

    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);

    if (ACPI_FAILURE (Status)) /* NsLookup */
    {
        if (Status != AE_ALREADY_EXISTS)
        {
            goto ErrorExit;
        }

        /* Node existed previously, make sure it is a method node */

        if (Node->Type != ACPI_TYPE_METHOD)
        {
            Status = AE_TYPE;
            goto ErrorExit;
        }
    }

    /* Copy the method AML to the local buffer */

    ACPI_MEMCPY (AmlBuffer, AmlStart, AmlLength);

    /* Initialize the method object with the new method's information */

    MethodObj->Method.AmlStart = AmlBuffer;
    MethodObj->Method.AmlLength = AmlLength;

    MethodObj->Method.ParamCount = (UINT8)
        (MethodFlags & AML_METHOD_ARG_COUNT);

    MethodObj->Method.MethodFlags = (UINT8)
        (MethodFlags & ~AML_METHOD_ARG_COUNT);

    if (MethodFlags & AML_METHOD_SERIALIZED)
    {
        MethodObj->Method.SyncLevel = (UINT8)
            ((MethodFlags & AML_METHOD_SYNC_LEVEL) >> 4);
    }

    /*
     * Now that it is complete, we can attach the new method object to
     * the method Node (detaches/deletes any existing object)
     */
    Status = AcpiNsAttachObject (Node, MethodObj,
                ACPI_TYPE_METHOD);

    /*
     * Flag indicates AML buffer is dynamic, must be deleted later.
     * Must be set only after attach above.
     */
    Node->Flags |= ANOBJ_ALLOCATED_BUFFER;

    /* Remove local reference to the method object */

    AcpiUtRemoveReference (MethodObj);
    return (Status);


ErrorExit:

    ACPI_FREE (AmlBuffer);
    ACPI_FREE (MethodObj);
    return (Status);
}

ACPI_EXPORT_SYMBOL (AcpiInstallMethod)