path: root/drivers/acpi/acpica/nspredef.c

/******************************************************************************
 *
 * Module Name: nspredef - Validation of ACPI predefined methods and objects
 *              $Revision: 1.1 $
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2011, 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 ACPI_CREATE_PREDEFINED_TABLE

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acpredef.h"

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nspredef")

/*******************************************************************************
 *
 * This module validates predefined ACPI objects that appear in the namespace,
 * at the time they are evaluated (via acpi_evaluate_object). The purpose of this
 * validation is to detect problems with BIOS-exposed predefined ACPI objects
 * before the results are returned to the ACPI-related drivers.
 *
 * There are several areas that are validated:
 *
 *  1) The number of input arguments as defined by the method/object in the
 *      ASL is validated against the ACPI specification.
 *  2) The type of the return object (if any) is validated against the ACPI
 *      specification.
 *  3) For returned package objects, the count of package elements is
 *      validated, as well as the type of each package element. Nested
 *      packages are supported.
 *
 * For any problems found, a warning message is issued.
 *
 ******************************************************************************/
/* Local prototypes */
static acpi_status
acpi_ns_check_package(struct acpi_predefined_data *data,
		      union acpi_operand_object **return_object_ptr);

static acpi_status
acpi_ns_check_package_list(struct acpi_predefined_data *data,
			   const union acpi_predefined_info *package,
			   union acpi_operand_object **elements, u32 count);

static acpi_status
acpi_ns_check_package_elements(struct acpi_predefined_data *data,
			       union acpi_operand_object **elements,
			       u8 type1,
			       u32 count1,
			       u8 type2, u32 count2, u32 start_index);

static acpi_status
acpi_ns_check_object_type(struct acpi_predefined_data *data,
			  union acpi_operand_object **return_object_ptr,
			  u32 expected_btypes, u32 package_index);

static acpi_status
acpi_ns_check_reference(struct acpi_predefined_data *data,
			union acpi_operand_object *return_object);

static void acpi_ns_get_expected_types(char *buffer, u32 expected_btypes);

/*
 * Names for the types that can be returned by the predefined objects.
 * Used for warning messages. Must be in the same order as the ACPI_RTYPEs
 */
static const char *acpi_rtype_names[] = {
	"/Integer",
	"/String",
	"/Buffer",
	"/Package",
	"/Reference",
};

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_predefined_names
 *
 * PARAMETERS:  Node            - Namespace node for the method/object
 *              user_param_count - Number of parameters actually passed
 *              return_status   - Status from the object evaluation
 *              return_object_ptr - Pointer to the object returned from the
 *                                evaluation of a method or object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check an ACPI name for a match in the predefined name list.
 *
 ******************************************************************************/

acpi_status
acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
			       u32 user_param_count,
			       acpi_status return_status,
			       union acpi_operand_object **return_object_ptr)
{
	union acpi_operand_object *return_object = *return_object_ptr;
	acpi_status status = AE_OK;
	const union acpi_predefined_info *predefined;
	char *pathname;
	struct acpi_predefined_data *data;

	/* Match the name for this method/object against the predefined list */

	predefined = acpi_ns_check_for_predefined_name(node);

	/* Get the full pathname to the object, for use in warning messages */

	pathname = acpi_ns_get_external_pathname(node);
	if (!pathname) {
		return AE_OK;	/* Could not get pathname, ignore */
	}

	/*
	 * Check that the parameter count for this method matches the ASL
	 * definition. For predefined names, ensure that both the caller and
	 * the method itself are in accordance with the ACPI specification.
	 */
	acpi_ns_check_parameter_count(pathname, node, user_param_count,
				      predefined);

	/* If not a predefined name, we cannot validate the return object */

	if (