utobject.c

linux-2.6.15.6

/******************************************************************************
 *
 * Module Name: utobject - ACPI object create/delete/size/cache routines
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, 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/acnamesp.h>
#include <acpi/amlcode.h>

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utobject")

/* Local prototypes */
static acpi_status
acpi_ut_get_simple_object_size(union acpi_operand_object *obj,
			       acpi_size * obj_length);

static acpi_status
acpi_ut_get_package_object_size(union acpi_operand_object *obj,
				acpi_size * obj_length);

static acpi_status
acpi_ut_get_element_length(u8 object_type,
			   union acpi_operand_object *source_object,
			   union acpi_generic_state *state, void *context);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_internal_object_dbg
 *
 * PARAMETERS:  module_name         - Source file name of caller
 *              line_number         - Line number of caller
 *              component_id        - Component type of caller
 *              Type                - ACPI Type of the new object
 *
 * RETURN:      A new internal object, null on failure
 *
 * DESCRIPTION: Create and initialize a new internal object.
 *
 * NOTE:        We always allocate the worst-case object descriptor because
 *              these objects are cached, and we want them to be
 *              one-size-satisifies-any-request.  This in itself may not be
 *              the most memory efficient, but the efficiency of the object
 *              cache should more than make up for this!
 *
 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_internal_object_dbg(char *module_name,
							      u32 line_number,
							      u32 component_id,
							      acpi_object_type
							      type)
{
	union acpi_operand_object *object;
	union acpi_operand_object *second_object;

	ACPI_FUNCTION_TRACE_STR("ut_create_internal_object_dbg",
				acpi_ut_get_type_name(type));

	/* Allocate the raw object descriptor */

	object =
	    acpi_ut_allocate_object_desc_dbg(module_name, line_number,
					     component_id);
	if (!object) {
		return_PTR(NULL);
	}

	switch (type) {
	case ACPI_TYPE_REGION:
	case ACPI_TYPE_BUFFER_FIELD:

		/* These types require a secondary object */

		second_object = acpi_ut_allocate_object_desc_dbg(module_name,
								 line_number,
								 component_id);
		if (!second_object) {
			acpi_ut_delete_object_desc(object);
			return_PTR(NULL);
		}

		second_object->common.type = ACPI_TYPE_LOCAL_EXTRA;
		second_object->common.reference_count = 1;

		/* Link the second object to the first */

		object->common.next_object = second_object;
		break;

	default:
		/* All others have no secondary object */
		break;
	}

	/* Save the object type in the object descriptor */

	object->common.type = (u8) type;

	/* Init the reference count */

	object->common.reference_count = 1;

	/* Any per-type initialization should go here */

	return_PTR(object);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_buffer_object
 *
 * PARAMETERS:  buffer_size            - Size of buffer to be created
 *
 * RETURN:      Pointer to a new Buffer object, null on failure
 *
 * DESCRIPTION: Create a fully initialized buffer object
 *
 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_buffer_object(acpi_size buffer_size)
{
	union acpi_operand_object *buffer_desc;
	u8 *buffer = NULL;

	ACPI_FUNCTION_TRACE_U32("ut_create_buffer_object", buffer_size);

	/* Create a new Buffer object */

	buffer_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
	if (!buffer_desc) {
		return_PTR(NULL);
	}

	/* Create an actual buffer only if size > 0 */

	if (buffer_size > 0) {
		/* Allocate the actual buffer */

		buffer = ACPI_MEM_CALLOCATE(buffer_size);
		if (!buffer) {
			ACPI_REPORT_ERROR(("create_buffer: could not allocate size %X\n", (u32) buffer_size));
			acpi_ut_remove_reference(buffer_desc);
			return_PTR(NULL);
		}
	}

	/* Complete buffer object initialization */

	buffer_desc->buffer.flags |= AOPOBJ_DATA_VALID;
	buffer_desc->buffer.pointer = buffer;
	buffer_desc->buffer.length = (u32) buffer_size;

	/* Return the new buffer descriptor */

	return_PTR(buffer_desc);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_string_object
 *
 * PARAMETERS:  string_size         - Size of string to be created. Does not
 *                                    include NULL terminator, this is added
 *                                    automatically.
 *
 * RETURN:      Pointer to a new String object
 *
 * DESCRIPTION: Create a fully initialized string object
 *
 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_string_object(acpi_size string_size)
{
	union acpi_operand_object *string_desc;
	char *string;

	ACPI_FUNCTION_TRACE_U32("ut_create_string_object", string_size);

	/* Create a new String object */

	string_desc = acpi_ut_create_internal_object(ACPI_TYPE_STRING);
	if (!string_desc) {
		return_PTR(NULL);
	}

	/*
	 * Allocate the actual string buffer -- (Size + 1) for NULL terminator.
	 * NOTE: Zero-length strings are NULL terminated
	 */
	string = ACPI_MEM_CALLOCATE(string_size + 1);
	if (!string) {
		ACPI_REPORT_ERROR(("create_string: could not allocate size %X\n", (u32) string_size));
		acpi_ut_remove_reference(string_desc);
		return_PTR(NULL);
	}

	/* Complete string object initialization */

	string_desc->string.pointer = string;
	string_desc->string.length = (u32) string_size;

	/* Return the new string descriptor */

	return_PTR(string_desc);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_valid_internal_object
 *
 * PARAMETERS:  Object              - Object to be validated
 *
 * RETURN:      TRUE if object is valid, FALSE otherwise
 *
 * DESCRIPTION: Validate a pointer to be an union acpi_operand_object
 *
 ******************************************************************************/

u8 acpi_ut_valid_internal_object(void *object)
{

	ACPI_FUNCTION_NAME("ut_valid_internal_object");

	/* Check for a null pointer */

	if (!object) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "**** Null Object Ptr\n"));
		return (FALSE);
	}

	/* Check the descriptor type field */

	switch (ACPI_GET_DESCRIPTOR_TYPE(object)) {
	case ACPI_DESC_TYPE_OPERAND:

		/* The object appears to be a valid union acpi_operand_object    */

		return (TRUE);

	default:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "%p is not not an ACPI operand obj [%s]\n",
				  object, acpi_ut_get_descriptor_name(object)));
		break;
	}

	return (FALSE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_allocate_object_desc_dbg
 *
 * PARAMETERS:  module_name         - Caller's module name (for error output)
 *              line_number         - Caller's line number (for error output)
 *              component_id        - Caller's component ID (for error output)
 *
 * RETURN:      Pointer to newly allocated object descriptor.  Null on error
 *
 * DESCRIPTION: Allocate a new object descriptor.  Gracefully handle
 *              error conditions.
 *
 ******************************************************************************/

void *acpi_ut_allocate_object_desc_dbg(char *module_name,
				       u32 line_number, u32 component_id)
{
	union acpi_operand_object *object;

	ACPI_FUNCTION_TRACE("ut_allocate_object_desc_dbg");

	object = acpi_os_acquire_object(acpi_gbl_operand_cache);