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

 *

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

 *

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

/*

 * Copyright (C) 2000 - 2015, 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 

#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 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;

	u64 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 (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 */

		return_desc = acpi_ut_create_integer_object(ACPI_UINT64_MAX);

		if (!return_desc) {

			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", match_value 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 */

			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 0x%X",

			    walk_state->opcode));

		status = AE_AML_BAD_OPCODE;

		goto cleanup;

	}

cleanup:

	/* Delete return object on error */

	if (ACPI_FAILURE(status)) {

		acpi_ut_remove_reference(return_desc);

	}

	/* Save return object on success */

	else {

		walk_state->result_obj = return_desc;

	}

	return_ACPI_STATUS(status);

}