dist/executer/exoparg6.c

/******************************************************************************
 *
 * Module Name: exoparg6 - AML execution - opcodes with 6 arguments
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2010, 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 __EXOPARG6_C__

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


#define _COMPONENT          ACPI_EXECUTER
        ACPI_MODULE_NAME    ("exoparg6")


/*!
 * Naming convention for AML interpreter execution routines.
 *
 * The routines that begin execution of AML opcodes are named with a common
 * convention based upon the number of arguments, the number of target operands,
 * and whether or not a value is returned:
 *
 *      AcpiExOpcode_xA_yT_zR
 *
 * Where:
 *
 * xA - ARGUMENTS:    The number of arguments (input operands) that are
 *                    required for this opcode type (1 through 6 args).
 * yT - TARGETS:      The number of targets (output operands) that are required
 *                    for this opcode type (0, 1, or 2 targets).
 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
 *                    as the function return (0 or 1).
 *
 * The AcpiExOpcode* functions are called via the Dispatcher component with
 * fully resolved operands.
!*/

/* Local prototypes */

static BOOLEAN
AcpiExDoMatch (
    UINT32                  MatchOp,
    ACPI_OPERAND_OBJECT     *PackageObj,
    ACPI_OPERAND_OBJECT     *MatchObj);


/*******************************************************************************
 *
 * FUNCTION:    AcpiExDoMatch
 *
 * PARAMETERS:  MatchOp         - The AML match operand
 *              PackageObj      - Object from the target package
 *              MatchObj        - Object to be matched
 *
 * RETURN:      TRUE if the match is successful, FALSE otherwise
 *
 * DESCRIPTION: Implements the low-level match for the ASL Match operator.
 *              Package elements will be implicitly converted to the type of
 *              the match object (Integer/Buffer/String).
 *
 ******************************************************************************/

static BOOLEAN
AcpiExDoMatch (
    UINT32                  MatchOp,
    ACPI_OPERAND_OBJECT     *PackageObj,
    ACPI_OPERAND_OBJECT     *MatchObj)
{
    BOOLEAN                 LogicalResult = TRUE;
    ACPI_STATUS             Status;


    /*
     * Note: Since the PackageObj/MatchObj ordering is opposite to that of
     * the standard logical operators, we have to reverse them when we call
     * DoLogicalOp in order to make the implicit conversion rules work
     * correctly. However, this means we have to flip the entire equation
     * also. A bit ugly perhaps, but overall, better than fussing the
     * parameters around at runtime, over and over again.
     *
     * Below, P[i] refers to the package element, M refers to the Match object.
     */
    switch (MatchOp)
    {
    case MATCH_MTR:

        /* Always true */

        break;

    case MATCH_MEQ:

        /*
         * True if equal: (P[i] == M)
         * Change to:     (M == P[i])
         */
        Status = AcpiExDoLogicalOp (AML_LEQUAL_OP, MatchObj, PackageObj,
                    &LogicalResult);
        if (ACPI_FAILURE (Status))
        {
            return (FALSE);
        }
        break;

    case MATCH_MLE:

        /*
         * True if less than or equal: (P[i] <= M) (P[i] NotGreater than M)
         * Change to:                  (M >= P[i]) (M NotLess than P[i])
         */
        Status = AcpiExDoLogicalOp (AML_LLESS_OP, MatchObj, PackageObj,
                    &LogicalResult);
        if (ACPI_FAILURE (Status))
        {
            return (FALSE);
        }
        LogicalResult = (BOOLEAN) !LogicalResult;
        break;

    case MATCH_MLT:

        /*
         * True if less than: (P[i] < M)
         * Change to:         (M > P[i])
         */
        Status = AcpiExDoLogicalOp (AML_LGREATER_OP, MatchObj, PackageObj,
                    &LogicalResult);
        if (ACPI_FAILURE (Status))
        {
            return (FALSE);
        }
        break;

    case MATCH_MGE:

        /*
         * True if greater than or equal: (P[i] >= M) (P[i] NotLess than M)
         * Change to:                     (M <= P[i]) (M NotGreater than P[i])
         */
        Status = AcpiExDoLogicalOp (AML_LGREATER_OP, MatchObj, PackageObj,
                    &LogicalResult);
        if (ACPI_FAILURE (Status))
        {
            return (FALSE);
        }
        LogicalResult = (BOOLEAN)!LogicalResult;
        break;

    case MATCH_MGT:

        /*
         * True if greater than: (P[i] > M)
         * Change to:            (M < P[i])
         */
        Status = AcpiExDoLogicalOp (AML_LLESS_OP, MatchObj, PackageObj,
                    &LogicalResult);
        if (ACPI_FAILURE (Status))
        {
            return (FALSE);
        }
        break;

    default:

        /* Undefined */

        return (FALSE);
    }

    return LogicalResult;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExOpcode_6A_0T_1R
 *
 * PARAMETERS:  WalkState           - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with 6 arguments, no target, and a return value
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExOpcode_6A_0T_1R (
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
    ACPI_OPERAND_OBJECT     *ReturnDesc = NULL;
    ACPI_STATUS             Status = AE_OK;
    UINT64                  Index;
    ACPI_OPERAND_OBJECT     *ThisElement;


    ACPI_FUNCTION_TRACE_STR (ExOpcode_6A_0T_1R,
        AcpiPsGetOpcodeName (WalkState->Opcode));


    switch (WalkState->Opcode)
    {
    case AML_MATCH_OP:
        /*
         * Match (SearchPkg[0], MatchOp1[1], MatchObj1[2],
         *                      MatchOp2[3], MatchObj2[4], StartIndex[5])
         */

        /* Validate both Match Term Operators (MTR, MEQ, etc.) */

        if ((Operand[1]->Integer.Value > MAX_MATCH_OPERATOR) ||
            (Operand[3]->Integer.Value > MAX_MATCH_OPERATOR))
        {
            ACPI_ERROR ((AE_INFO, "Match operator out of range"));
            Status = AE_AML_OPERAND_VALUE;
            goto Cleanup;
        }

        /* Get the package StartIndex, validate against the package length */

        Index = Operand[5]->Integer.Value;
        if (Index >= Operand[0]->Package.Count)
        {
            ACPI_ERROR ((AE_INFO,
                "Index (0x%8.8X%8.8X) beyond package end (0x%X)",
                ACPI_FORMAT_UINT64 (Index), Operand[0]->Package.Count));
            Status = AE_AML_PACKAGE_LIMIT;
            goto Cleanup;
        }

        /* Create an integer for the return value */
        /* Default return value is ACPI_UINT64_MAX if no match found */

        ReturnDesc = AcpiUtCreateIntegerObject (ACPI_UINT64_MAX);
        if (!ReturnDesc)
        {
            Status = AE_NO_MEMORY;
            goto Cleanup;

        }

        /*
         * Examine each element until a match is found. Both match conditions
         * must be satisfied for a match to occur. Within the loop,
         * "continue" signifies that the current element does not match
         * and the next should be examined.
         *
         * Upon finding a match, the loop will terminate via "break" at
         * the bottom.  If it terminates "normally", MatchValue will be
         * ACPI_UINT64_MAX (Ones) (its initial value) indicating that no
         * match was found.
         */
        for ( ; Index < Operand[0]->Package.Count; Index++)
        {
            /* Get the current package element */

            ThisElement = Operand[0]->Package.Elements[Index];

            /* Treat any uninitialized (NULL) elements as non-matching */

            if (!ThisElement)
            {
                continue;
            }

            /*
             * Both match conditions must be satisfied. Execution of a continue
             * (proceed to next iteration of enclosing for loop) signifies a
             * non-match.
             */
            if (!AcpiExDoMatch ((UINT32) Operand[1]->Integer.Value,
                                ThisElement, Operand[2]))
            {
                continue;
            }

            if (!AcpiExDoMatch ((UINT32) Operand[3]->Integer.Value,
                                ThisElement, Operand[4]))
            {
                continue;
            }

            /* Match found: Index is the return value */

            ReturnDesc->Integer.Value = Index;
            break;
        }
        break;


    case AML_LOAD_TABLE_OP:

        Status = AcpiExLoadTableOp (WalkState, &ReturnDesc);
        break;


    default:

        ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
            WalkState->Opcode));
        Status = AE_AML_BAD_OPCODE;
        goto Cleanup;
    }


Cleanup:

    /* Delete return object on error */

    if (ACPI_FAILURE (Status))
    {
        AcpiUtRemoveReference (ReturnDesc);
    }

    /* Save return object on success */

    else
    {
        WalkState->ResultObj = ReturnDesc;
    }

    return_ACPI_STATUS (Status);
}