nseval.c

linux-2.4.29操作系统的源码

/*******************************************************************************
 *
 * Module Name: nseval - Object evaluation interfaces -- includes control
 *                       method lookup and execution.
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2004, 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/acparser.h>
#include <acpi/acinterp.h>
#include <acpi/acnamesp.h>


#define _COMPONENT          ACPI_NAMESPACE
	 ACPI_MODULE_NAME    ("nseval")


/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_evaluate_relative
 *
 * PARAMETERS:  Handle              - The relative containing object
 *              Pathname            - Name of method to execute, If NULL, the
 *                                    handle is the object to execute
 *              Params              - List of parameters to pass to the method,
 *                                    terminated by NULL.  Params itself may be
 *                                    NULL if no parameters are being passed.
 *              return_object       - Where to put method's return value (if
 *                                    any).  If NULL, no value is returned.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Find and execute the requested method using the handle as a
 *              scope
 *
 * MUTEX:       Locks Namespace
 *
 ******************************************************************************/

acpi_status
acpi_ns_evaluate_relative (
	struct acpi_namespace_node      *handle,
	char                            *pathname,
	union acpi_operand_object       **params,
	union acpi_operand_object       **return_object)
{
	acpi_status                     status;
	struct acpi_namespace_node      *prefix_node;
	struct acpi_namespace_node      *node = NULL;
	union acpi_generic_state        *scope_info;
	char                            *internal_path = NULL;


	ACPI_FUNCTION_TRACE ("ns_evaluate_relative");


	/*
	 * Must have a valid object handle
	 */
	if (!handle) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	/* Build an internal name string for the method */

	status = acpi_ns_internalize_name (pathname, &internal_path);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	scope_info = acpi_ut_create_generic_state ();
	if (!scope_info) {
		goto cleanup1;
	}

	/* Get the prefix handle and Node */

	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE (status)) {
		goto cleanup;
	}

	prefix_node = acpi_ns_map_handle_to_node (handle);
	if (!prefix_node) {
		(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
		status = AE_BAD_PARAMETER;
		goto cleanup;
	}

	/* Lookup the name in the namespace */

	scope_info->scope.node = prefix_node;
	status = acpi_ns_lookup (scope_info, internal_path, ACPI_TYPE_ANY,
			 ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
			 &node);

	(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);

	if (ACPI_FAILURE (status)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Object [%s] not found [%s]\n",
			pathname, acpi_format_exception (status)));
		goto cleanup;
	}

	/*
	 * Now that we have a handle to the object, we can attempt
	 * to evaluate it.
	 */
	ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
		pathname, node, acpi_ns_get_attached_object (node)));

	status = acpi_ns_evaluate_by_handle (node, params, return_object);

	ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n",
		pathname));

cleanup:
	acpi_ut_delete_generic_state (scope_info);

cleanup1:
	ACPI_MEM_FREE (internal_path);
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_evaluate_by_name
 *
 * PARAMETERS:  Pathname            - Fully qualified pathname to the object
 *              return_object       - Where to put method's return value (if
 *                                    any).  If NULL, no value is returned.
 *              Params              - List of parameters to pass to the method,
 *                                    terminated by NULL.  Params itself may be
 *                                    NULL if no parameters are being passed.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Find and execute the requested method passing the given
 *              parameters
 *
 * MUTEX:       Locks Namespace
 *
 ******************************************************************************/

acpi_status
acpi_ns_evaluate_by_name (
	char                            *pathname,
	union acpi_operand_object       **params,
	union acpi_operand_object       **return_object)
{
	acpi_status                     status;
	struct acpi_namespace_node      *node = NULL;
	char                            *internal_path = NULL;


	ACPI_FUNCTION_TRACE ("ns_evaluate_by_name");


	/* Build an internal name string for the method */

	status = acpi_ns_internalize_name (pathname, &internal_path);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE (status)) {
		goto cleanup;
	}

	/* Lookup the name in the namespace */

	status = acpi_ns_lookup (NULL, internal_path, ACPI_TYPE_ANY,
			 ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
			 &node);

	(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);

	if (ACPI_FAILURE (status)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Object at [%s] was not found, status=%.4X\n",
			pathname, status));
		goto cleanup;
	}

	/*
	 * Now that we have a handle to the object, we can attempt
	 * to evaluate it.
	 */
	ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
		pathname, node, acpi_ns_get_attached_object (node)));

	status = acpi_ns_evaluate_by_handle (node, params, return_object);

	ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n",
		pathname));


cleanup:

	/* Cleanup */

	if (internal_path) {
		ACPI_MEM_FREE (internal_path);
	}

	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_evaluate_by_handle
 *
 * PARAMETERS:  Handle              - Method Node to execute
 *              Params              - List of parameters to pass to the method,
 *                                    terminated by NULL.  Params itself may be
 *                                    NULL if no parameters are being passed.
 *              return_object       - Where to put method's return value (if
 *                                    any).  If NULL, no value is returned.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute the requested method passing the given parameters
 *
 * MUTEX:       Locks Namespace
 *
 ******************************************************************************/