path: root/source/components/utilities/utmisc.c

/*******************************************************************************
 *
 * Module Name: utmisc - common utility procedures
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2012, Intel Corp.
 * All rights reserved.
 *
 * 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.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * 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 MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
 */


#define __UTMISC_C__

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


#define _COMPONENT          ACPI_UTILITIES
        ACPI_MODULE_NAME    ("utmisc")


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtIsPciRootBridge
 *
 * PARAMETERS:  Id              - The HID/CID in string format
 *
 * RETURN:      TRUE if the Id is a match for a PCI/PCI-Express Root Bridge
 *
 * DESCRIPTION: Determine if the input ID is a PCI Root Bridge ID.
 *
 ******************************************************************************/

BOOLEAN
AcpiUtIsPciRootBridge (
    char                    *Id)
{

    /*
     * Check if this is a PCI root bridge.
     * ACPI 3.0+: check for a PCI Express root also.
     */
    if (!(ACPI_STRCMP (Id,
            PCI_ROOT_HID_STRING)) ||

        !(ACPI_STRCMP (Id,
            PCI_EXPRESS_ROOT_HID_STRING)))
    {
        return (TRUE);
    }

    return (FALSE);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtIsAmlTable
 *
 * PARAMETERS:  Table               - An ACPI table
 *
 * RETURN:      TRUE if table contains executable AML; FALSE otherwise
 *
 * DESCRIPTION: Check ACPI Signature for a table that contains AML code.
 *              Currently, these are DSDT,SSDT,PSDT. All other table types are
 *              data tables that do not contain AML code.
 *
 ******************************************************************************/

BOOLEAN
AcpiUtIsAmlTable (
    ACPI_TABLE_HEADER       *Table)
{

    /* These are the only tables that contain executable AML */

    if (ACPI_COMPARE_NAME (Table->Signature, ACPI_SIG_DSDT) ||
        ACPI_COMPARE_NAME (Table->Signature, ACPI_SIG_PSDT) ||
        ACPI_COMPARE_NAME (Table->Signature, ACPI_SIG_SSDT))
    {
        return (TRUE);
    }

    return (FALSE);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtDwordByteSwap
 *
 * PARAMETERS:  Value           - Value to be converted
 *
 * RETURN:      UINT32 integer with bytes swapped
 *
 * DESCRIPTION: Convert a 32-bit value to big-endian (swap the bytes)
 *
 ******************************************************************************/

UINT32
AcpiUtDwordByteSwap (
    UINT32                  Value)
{
    union
    {
        UINT32              Value;
        UINT8               Bytes[4];
    } Out;
    union
    {
        UINT32              Value;
        UINT8               Bytes[4];
    } In;


    ACPI_FUNCTION_ENTRY ();


    In.Value = Value;

    Out.Bytes[0] = In.Bytes[3];
    Out.Bytes[1] = In.Bytes[2];
    Out.Bytes[2] = In.Bytes[1];
    Out.Bytes[3] = In.Bytes[0];

    return (Out.Value);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtSetIntegerWidth
 *
 * PARAMETERS:  Revision            From DSDT header
 *
 * RETURN:      None
 *
 * DESCRIPTION: Set the global integer bit width based upon the revision
 *              of the DSDT. For Revision 1 and 0, Integers are 32 bits.
 *              For Revision 2 and above, Integers are 64 bits. Yes, this
 *              makes a difference.
 *
 ******************************************************************************/

void
AcpiUtSetIntegerWidth (
    UINT8                   Revision)
{

    if (Revision < 2)
    {
        /* 32-bit case */

        AcpiGbl_IntegerBitWidth    = 32;
        AcpiGbl_IntegerNybbleWidth = 8;
        AcpiGbl_IntegerByteWidth   = 4;
    }
    else
    {
        /* 64-bit case (ACPI 2.0+) */

        AcpiGbl_IntegerBitWidth    = 64;
        AcpiGbl_IntegerNybbleWidth = 16;
        AcpiGbl_IntegerByteWidth   = 8;
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtCreateUpdateStateAndPush
 *
 * PARAMETERS:  Object          - Object to be added to the new state
 *              Action          - Increment/Decrement
 *              StateList       - List the state will be added to
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new state and push it
 *
 ******************************************************************************/

ACPI_STATUS
AcpiUtCreateUpdateStateAndPush (
    ACPI_OPERAND_OBJECT     *Object,
    UINT16                  Action,
    ACPI_GENERIC_STATE      **StateList)
{
    ACPI_GENERIC_STATE       *State;


    ACPI_FUNCTION_ENTRY ();


    /* Ignore null objects; these are expected */

    if (!Object)
    {
        return (AE_OK);
    }

    State = AcpiUtCreateUpdateState (Object, Action);
    if (!State)
    {
        return (AE_NO_MEMORY);
    }

    AcpiUtPushGenericState (StateList, State);
    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtWalkPackageTree
 *
 * PARAMETERS:  SourceObject        - The package to walk
 *              TargetObject        - Target object (if package is being copied)
 *              WalkCallback        - Called once for each package element
 *              Context             - Passed to the callback function
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk through a package
 *
 ******************************************************************************/

ACPI_STATUS
AcpiUtWalkPackageTree (
    ACPI_OPERAND_OBJECT     *SourceObject,
    void                    *TargetObject,
    ACPI_PKG_CALLBACK       WalkCallback,
    void                    *Context)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_GENERIC_STATE      *StateList = NULL;
    ACPI_GENERIC_STATE      *State;
    UINT32                  ThisIndex;
    ACPI_OPERAND_OBJECT     *ThisSourceObj;


    ACPI_FUNCTION_TRACE (UtWalkPackageTree);


    State = AcpiUtCreatePkgState (SourceObject, TargetObject, 0);
    if (!State)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    while (State)
    {
        /* Get one element of the package */

        ThisIndex     = State->Pkg.Index;
        ThisSourceObj = (ACPI_OPERAND_OBJECT *)
                        State->Pkg.SourceObject->Package.Elements[ThisIndex];

        /*
         * Check for:
         * 1) An uninitialized package element. It is completely
         *    legal to declare a package and leave it uninitialized
         * 2) Not an internal object - can be a namespace node instead
         * 3) Any type other than a package. Packages are handled in else
         *    case below.
         */
        if ((!ThisSourceObj) ||
            (ACPI_GET_DESCRIPTOR_TYPE (ThisSourceObj) != ACPI_DESC_TYPE_OPERAND) ||
            (ThisSourceObj->Common.Type != ACPI_TYPE_PACKAGE))
        {
            Status = WalkCallback (ACPI_COPY_TYPE_SIMPLE, ThisSourceObj,
                                    State, Context);
            if (ACPI_FAILURE (Status))
            {
                return_ACPI_STATUS (Status);
            }

            State->Pkg.Index++;
            while (State->Pkg.Index >= State->Pkg.SourceObject->Package.Count)
            {
                /*
                 * We've handled all of the objects at this level,  This means
                 * that we have just completed a package. That package may
                 * have contained one or more packages itself.
                 *
                 * Delete this state and pop the previous state (package).
                 */
                AcpiUtDeleteGenericState (State);
                State = AcpiUtPopGenericState (&StateList);

                /* Finished when there are no more states */

                if (!State)
                {
                    /*
                     * We have handled all of the objects in the top level
                     * package just add the length of the package objects
                     * and exit
                     */
                    return_ACPI_STATUS (AE_OK);
                }

                /*
                 * Go back up a level and move the index past the just
                 * completed package object.
                 */
                State->Pkg.Index++;
            }
        }
        else
        {
            /* This is a subobject of type package */

            Status = WalkCallback (ACPI_COPY_TYPE_PACKAGE, ThisSourceObj,
                                        State, Context);
            if (ACPI_FAILURE (Status))
            {
                return_ACPI_STATUS (Status);
            }

            /*
             * Push the current state and create a new one
             * The callback above returned a new target package object.
             */
            AcpiUtPushGenericState (&StateList, State);
            State = AcpiUtCreatePkgState (ThisSourceObj,
                                            State->Pkg.ThisTargetObj, 0);
            if (!State)
            {
                /* Free any stacked Update State objects */

                while (StateList)
                {
                    State = AcpiUtPopGenericState (&StateList);
                    AcpiUtDeleteGenericState (State);
                }
                return_ACPI_STATUS (AE_NO_MEMORY);
            }
        }
    }

    /* We should never get here */

    return_ACPI_STATUS (AE_AML_INTERNAL);
}


#ifdef ACPI_DEBUG_OUTPUT
/*******************************************************************************
 *
 * FUNCTION:    AcpiUtDisplayInitPathname
 *
 * PARAMETERS:  Type                - Object type of the node
 *              ObjHandle           - Handle whose pathname will be displayed
 *              Path                - Additional path string to be appended.
 *                                      (NULL if no extra path)
 *
 * RETURN:      ACPI_STATUS
 *
 * DESCRIPTION: Display full pathname of an object, DEBUG ONLY
 *
 ******************************************************************************/

void
AcpiUtDisplayInitPathname (
    UINT8                   Type,
    ACPI_NAMESPACE_NODE     *ObjHandle,
    char                    *Path)
{
    ACPI_STATUS             Status;
    ACPI_BUFFER             Buffer;


    ACPI_FUNCTION_ENTRY ();


    /* Only print the path if the appropriate debug level is enabled */

    if (!(AcpiDbgLevel & ACPI_LV_INIT_NAMES))
    {
        return;
    }

    /* Get the full pathname to the node */

    Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
    Status = AcpiNsHandleToPathname (ObjHandle, &Buffer);
    if (ACPI_FAILURE (Status))
    {
        return;
    }

    /* Print what we're doing */

    switch (Type)
    {
    case ACPI_TYPE_METHOD:
        AcpiOsPrintf ("Executing    ");
        break;

    default:
        AcpiOsPrintf ("Initializing ");
        break;
    }

    /* Print the object type and pathname */

    AcpiOsPrintf ("%-12s  %s",
        AcpiUtGetTypeName (Type), (char *) Buffer.Pointer);

    /* Extra path is used to append names like _STA, _INI, etc. */

    if (Path)
    {
        AcpiOsPrintf (".%s", Path);
    }
    AcpiOsPrintf ("\n");

    ACPI_FREE (Buffer.Pointer);
}
#endif