exoparg6.c

Go to the documentation of this file.

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

/*
 * Copyright (C) 2000 - 2020, 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.
 */

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


#define _COMPONENT          ACPI_EXECUTER
        ACPI_MODULE_NAME    ("exoparg6")



/* 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_LOGICAL_EQUAL_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_LOGICAL_LESS_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_LOGICAL_GREATER_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_LOGICAL_GREATER_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_LOGICAL_LESS_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);
}