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/******************************************************************************

 *

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

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2007, R. Byron Moore

 * 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/acpi.h>

#include <acpi/acinterp.h>

#include <acpi/acparser.h>

#include <acpi/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 u8

acpi_ex_do_match(u32 match_op,

                 union acpi_operand_object *package_obj,

                 union acpi_operand_object *match_obj);

/*******************************************************************************

 *

 * FUNCTION:    acpi_ex_do_match

 *

 * PARAMETERS:  match_op        - The AML match operand

 *              package_obj     - Object from the target package

 *              match_obj       - 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 u8

acpi_ex_do_match(u32 match_op,

                 union acpi_operand_object *package_obj,

                 union acpi_operand_object *match_obj)

{

        u8 logical_result = TRUE;

        acpi_status status;

        /*

         * Note: Since the package_obj/match_obj ordering is opposite to that of

         * the standard logical operators, we have to reverse them when we call

         * do_logical_op 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 (match_op) {

        case MATCH_MTR:

                /* Always true */

                break;

        case MATCH_MEQ:

                /*

                 * True if equal: (P[i] == M)

                 * Change to:     (M == P[i])

                 */

                status =

                    acpi_ex_do_logical_op(AML_LEQUAL_OP, match_obj, package_obj,

                                          &logical_result);

                if (ACPI_FAILURE(status)) {

                        return (FALSE);

                }

                break;

        case MATCH_MLE:

                /*

                 * True if less than or equal: (P[i] <= M) (P[i] not_greater than M)

                 * Change to:                  (M >= P[i]) (M not_less than P[i])

                 */

                status =

                    acpi_ex_do_logical_op(AML_LLESS_OP, match_obj, package_obj,

                                          &logical_result);

                if (ACPI_FAILURE(status)) {

                        return (FALSE);

                }

                logical_result = (u8) ! logical_result;

                break;

        case MATCH_MLT:

                /*

                 * True if less than: (P[i] < M)

                 * Change to:         (M > P[i])

                 */

                status =

                    acpi_ex_do_logical_op(AML_LGREATER_OP, match_obj,

                                          package_obj, &logical_result);

                if (ACPI_FAILURE(status)) {

                        return (FALSE);

                }

                break;

        case MATCH_MGE:

                /*

                 * True if greater than or equal: (P[i] >= M) (P[i] not_less than M)

                 * Change to:                     (M <= P[i]) (M not_greater than P[i])

                 */

                status =

                    acpi_ex_do_logical_op(AML_LGREATER_OP, match_obj,

                                          package_obj, &logical_result);

                if (ACPI_FAILURE(status)) {

                        return (FALSE);

                }

                logical_result = (u8) ! logical_result;

                break;

        case MATCH_MGT:

                /*

                 * True if greater than: (P[i] > M)

                 * Change to:            (M < P[i])

                 */

                status =

                    acpi_ex_do_logical_op(AML_LLESS_OP, match_obj, package_obj,

                                          &logical_result);

                if (ACPI_FAILURE(status)) {

                        return (FALSE);

                }

                break;

        default:

                /* Undefined */

                return (FALSE);

        }

        return logical_result;

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ex_opcode_6A_0T_1R

 *

 * PARAMETERS:  walk_state          - Current walk state

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Execute opcode with 6 arguments, no target, and a return value

 *

 ******************************************************************************/

acpi_status acpi_ex_opcode_6A_0T_1R(struct acpi_walk_state * walk_state)

{

        union acpi_operand_object **operand = &walk_state->operands[0];

        union acpi_operand_object *return_desc = NULL;

        acpi_status status = AE_OK;

        acpi_integer index;

        union acpi_operand_object *this_element;

        ACPI_FUNCTION_TRACE_STR(ex_opcode_6A_0T_1R,

                                acpi_ps_get_opcode_name(walk_state->opcode));

        switch (walk_state->opcode) {

        case AML_MATCH_OP:

                /*

                 * Match (search_pkg[0], match_op1[1], match_obj1[2],

                 *                      match_op2[3], match_obj2[4], start_index[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 start_index, validate against the package length */

                index = operand[5]->integer.value;

                if (index >= operand[0]->package.count) {

                        ACPI_ERROR((AE_INFO,

                                    "Index (%X%8.8X) beyond package end (%X)",

                                    ACPI_FORMAT_UINT64(index),

                                    operand[0]->package.count));

                        status = AE_AML_PACKAGE_LIMIT;

                        goto cleanup;

                }

                /* Create an integer for the return value */

                return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);

                if (!return_desc) {

                        status = AE_NO_MEMORY;

                        goto cleanup;

                }

                /* Default return value if no match found */

                return_desc->integer.value = ACPI_INTEGER_MAX;

                /*

                 * 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", match_value will be

                 * ACPI_INTEGER_MAX (Ones) (its initial value) indicating that no

                 * match was found.

                 */

                for (; index < operand[0]->package.count; index++) {

                        /* Get the current package element */

                        this_element = operand[0]->package.elements[index];

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

                        if (!this_element) {

                                continue;

                        }

                        /*

                         * Both match conditions must be satisfied. Execution of a continue

                         * (proceed to next iteration of enclosing for loop) signifies a

                         * non-match.

                         */

                        if (!acpi_ex_do_match((u32) operand[1]->integer.value,

                                              this_element, operand[2])) {

                                continue;

                        }

                        if (!acpi_ex_do_match((u32) operand[3]->integer.value,

                                              this_element, operand[4])) {

                                continue;

                        }

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

                        return_desc->integer.value = index;

                        break;

                }

                break;

        case AML_LOAD_TABLE_OP:

                status = acpi_ex_load_table_op(walk_state, &return_desc);

                break;

        default:

                ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",

                            walk_state->opcode));

                status = AE_AML_BAD_OPCODE;

                goto cleanup;

        }

        walk_state->result_obj = return_desc;

      cleanup:

        /* Delete return object on error */

        if (ACPI_FAILURE(status)) {

                acpi_ut_remove_reference(return_desc);

        }

        return_ACPI_STATUS(status);

}