dsobject.c

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/******************************************************************************
 *
 * Module Name: dsobject - Dispatcher object management routines
 *              $Revision: 53 $
 *
 *****************************************************************************/

/*
 *  Copyright (C) 2000 R. Byron Moore
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


#include "acpi.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"

#define _COMPONENT          DISPATCHER
	 MODULE_NAME         ("dsobject")


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_init_one_object
 *
 * PARAMETERS:  Obj_handle      - Node
 *              Level           - Current nesting level
 *              Context         - Points to a init info struct
 *              Return_value    - Not used
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Callback from Acpi_walk_namespace. Invoked for every object
 *              within the  namespace.
 *
 *              Currently, the only objects that require initialization are:
 *              1) Methods
 *              2) Op Regions
 *
 ******************************************************************************/

ACPI_STATUS
acpi_ds_init_one_object (
	ACPI_HANDLE             obj_handle,
	u32                     level,
	void                    *context,
	void                    **return_value)
{
	OBJECT_TYPE_INTERNAL    type;
	ACPI_STATUS             status;
	ACPI_INIT_WALK_INFO     *info = (ACPI_INIT_WALK_INFO *) context;
	u8                      table_revision;


	info->object_count++;
	table_revision = info->table_desc->pointer->revision;

	/*
	 * We are only interested in objects owned by the table that
	 * was just loaded
	 */

	if (((ACPI_NAMESPACE_NODE *) obj_handle)->owner_id !=
			info->table_desc->table_id)
	{
		return (AE_OK);
	}


	/* And even then, we are only interested in a few object types */

	type = acpi_ns_get_type (obj_handle);

	switch (type)
	{

	case ACPI_TYPE_REGION:

		acpi_ds_initialize_region (obj_handle);

		info->op_region_count++;
		break;


	case ACPI_TYPE_METHOD:

		info->method_count++;

		/*
		 * Set the execution data width (32 or 64) based upon the
		 * revision number of the parent ACPI table.
		 */

		if (table_revision == 1) {
			((ACPI_NAMESPACE_NODE *)obj_handle)->flags |= ANOBJ_DATA_WIDTH_32;
		}

		/*
		 * Always parse methods to detect errors, we may delete
		 * the parse tree below
		 */

		status = acpi_ds_parse_method (obj_handle);

		/* TBD: [Errors] what do we do with an error? */

		if (ACPI_FAILURE (status)) {
			break;
		}

		/*
		 * Delete the parse tree.  We simple re-parse the method
		 * for every execution since there isn't much overhead
		 */
		acpi_ns_delete_namespace_subtree (obj_handle);
		break;

	default:
		break;
	}

	/*
	 * We ignore errors from above, and always return OK, since
	 * we don't want to abort the walk on a single error.
	 */
	return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_initialize_objects
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk the entire namespace and perform any necessary
 *              initialization on the objects found therein
 *
 ******************************************************************************/

ACPI_STATUS
acpi_ds_initialize_objects (
	ACPI_TABLE_DESC         *table_desc,
	ACPI_NAMESPACE_NODE     *start_node)
{
	ACPI_STATUS             status;
	ACPI_INIT_WALK_INFO     info;


	info.method_count   = 0;
	info.op_region_count = 0;
	info.object_count   = 0;
	info.table_desc     = table_desc;


	/* Walk entire namespace from the supplied root */

	status = acpi_walk_namespace (ACPI_TYPE_ANY, start_node,
			  ACPI_UINT32_MAX, acpi_ds_init_one_object,
			  &info, NULL);

	return (AE_OK);
}


/*****************************************************************************
 *
 * FUNCTION:    Acpi_ds_init_object_from_op
 *
 * PARAMETERS:  Op              - Parser op used to init the internal object
 *              Opcode          - AML opcode associated with the object
 *              Obj_desc        - Namespace object to be initialized
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize a namespace object from a parser Op and its
 *              associated arguments.  The namespace object is a more compact
 *              representation of the Op and its arguments.
 *
 ****************************************************************************/

ACPI_STATUS
acpi_ds_init_object_from_op (
	ACPI_WALK_STATE         *walk_state,
	ACPI_PARSE_OBJECT       *op,
	u16                     opcode,
	ACPI_OPERAND_OBJECT     **obj_desc)
{
	ACPI_STATUS             status;
	ACPI_PARSE_OBJECT       *arg;
	ACPI_PARSE2_OBJECT      *byte_list;
	ACPI_OPERAND_OBJECT     *arg_desc;
	ACPI_OPCODE_INFO        *op_info;


	op_info = acpi_ps_get_opcode_info (opcode);
	if (ACPI_GET_OP_TYPE (op_info) != ACPI_OP_TYPE_OPCODE) {
		/* Unknown opcode */

		return (AE_TYPE);
	}


	/* Get and prepare the first argument */

	switch ((*obj_desc)->common.type)
	{
	case ACPI_TYPE_BUFFER:

		/* First arg is a number */

		acpi_ds_create_operand (walk_state, op->value.arg, 0);
		arg_desc = walk_state->operands [walk_state->num_operands - 1];
		acpi_ds_obj_stack_pop (1, walk_state);

		/* Resolve the object (could be an arg or local) */

		status = acpi_aml_resolve_to_value (&arg_desc, walk_state);
		if (ACPI_FAILURE (status)) {
			acpi_cm_remove_reference (arg_desc);
			return (status);
		}

		/* We are expecting a number */

		if (arg_desc->common.type != ACPI_TYPE_NUMBER) {
			acpi_cm_remove_reference (arg_desc);
			return (AE_TYPE);
		}

		/* Get the value, delete the internal object */

		(*obj_desc)->buffer.length = (u32) arg_desc->number.value;
		acpi_cm_remove_reference (arg_desc);

		/* Allocate the buffer */

		if ((*obj_desc)->buffer.length == 0) {
			(*obj_desc)->buffer.pointer = NULL;
			REPORT_WARNING (("Buffer created with zero length in AML\n"));
			break;
		}

		else {
			(*obj_desc)->buffer.pointer =
					  acpi_cm_callocate ((*obj_desc)->buffer.length);

			if (!(*obj_desc)->buffer.pointer) {
				return (AE_NO_MEMORY);
			}
		}

		/*
		 * Second arg is the buffer data (optional)
		 * Byte_list can be either individual bytes or a
		 * string initializer!
		 */

		/* skip first arg */
		arg = op->value.arg;
		byte_list = (ACPI_PARSE2_OBJECT *) arg->next;
		if (byte_list) {
			if (byte_list->opcode != AML_BYTELIST_OP) {
				return (AE_TYPE);
			}

			MEMCPY ((*obj_desc)->buffer.pointer, byte_list->data,
					(*obj_desc)->buffer.length);
		}

		break;


	case ACPI_TYPE_PACKAGE:

		/*
		 * When called, an internal package object has already
		 *  been built and is pointed to by *Obj_desc.
		 *  Acpi_ds_build_internal_object build another internal
		 *  package object, so remove reference to the original
		 *  so that it is deleted.  Error checking is done
		 *  within the remove reference function.
		 */
		acpi_cm_remove_reference(*obj_desc);

		status = acpi_ds_build_internal_object (walk_state, op, obj_desc);
		break;

	case ACPI_TYPE_NUMBER:
		(*obj_desc)->number.value = op->value.integer;
		break;


	case ACPI_TYPE_STRING:
		(*obj_desc)->string.pointer = op->value.string;
		(*obj_desc)->string.length = STRLEN (op->value.string);
		break;


	case ACPI_TYPE_METHOD:
		break;


	case INTERNAL_TYPE_REFERENCE: