dsmthdat.c

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/*******************************************************************************
 *
 * Module Name: dsmthdat - control method arguments and local variables
 *              $Revision: 59 $
 *
 ******************************************************************************/

/*
 *  Copyright (C) 2000 - 2002, 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 "acdispat.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"


#define _COMPONENT          ACPI_DISPATCHER
	 ACPI_MODULE_NAME    ("dsmthdat")


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_method_data_init
 *
 * PARAMETERS:  Walk_state          - Current walk state object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize the data structures that hold the method's arguments
 *              and locals.  The data struct is an array of NTEs for each.
 *              This allows Ref_of and De_ref_of to work properly for these
 *              special data types.
 *
 * NOTES:       Walk_state fields are initialized to zero by the
 *              ACPI_MEM_CALLOCATE().
 *
 *              A pseudo-Namespace Node is assigned to each argument and local
 *              so that Ref_of() can return a pointer to the Node.
 *
 ******************************************************************************/

acpi_status
acpi_ds_method_data_init (
	acpi_walk_state         *walk_state)
{
	u32                     i;


	ACPI_FUNCTION_TRACE ("Ds_method_data_init");


	/* Init the method arguments */

	for (i = 0; i < MTH_NUM_ARGS; i++) {
		ACPI_MOVE_UNALIGNED32_TO_32 (&walk_state->arguments[i].name,
				 NAMEOF_ARG_NTE);
		walk_state->arguments[i].name.integer |= (i << 24);
		walk_state->arguments[i].descriptor   = ACPI_DESC_TYPE_NAMED;
		walk_state->arguments[i].type         = ACPI_TYPE_ANY;
		walk_state->arguments[i].flags        = ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_ARG;
	}

	/* Init the method locals */

	for (i = 0; i < MTH_NUM_LOCALS; i++) {
		ACPI_MOVE_UNALIGNED32_TO_32 (&walk_state->local_variables[i].name,
				 NAMEOF_LOCAL_NTE);

		walk_state->local_variables[i].name.integer |= (i << 24);
		walk_state->local_variables[i].descriptor  = ACPI_DESC_TYPE_NAMED;
		walk_state->local_variables[i].type        = ACPI_TYPE_ANY;
		walk_state->local_variables[i].flags       = ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_LOCAL;
	}

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_method_data_delete_all
 *
 * PARAMETERS:  Walk_state          - Current walk state object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Delete method locals and arguments.  Arguments are only
 *              deleted if this method was called from another method.
 *
 ******************************************************************************/

acpi_status
acpi_ds_method_data_delete_all (
	acpi_walk_state         *walk_state)
{
	u32                     index;


	ACPI_FUNCTION_TRACE ("Ds_method_data_delete_all");


	/* Detach the locals */

	for (index = 0; index < MTH_NUM_LOCALS; index++) {
		if (walk_state->local_variables[index].object) {
			ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%d=%p\n",
					index, walk_state->local_variables[index].object));

			/* Detach object (if present) and remove a reference */

			acpi_ns_detach_object (&walk_state->local_variables[index]);
	   }
	}

	/* Detach the arguments */

	for (index = 0; index < MTH_NUM_ARGS; index++) {
		if (walk_state->arguments[index].object) {
			ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%d=%p\n",
					index, walk_state->arguments[index].object));

			/* Detach object (if present) and remove a reference */

			acpi_ns_detach_object (&walk_state->arguments[index]);
		}
	}

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_method_data_init_args
 *
 * PARAMETERS:  *Params         - Pointer to a parameter list for the method
 *              Max_param_count - The arg count for this method
 *              Walk_state      - Current walk state object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize arguments for a method.  The parameter list is a list
 *              of ACPI operand objects, either null terminated or whose length
 *              is defined by Max_param_count.
 *
 ******************************************************************************/

acpi_status
acpi_ds_method_data_init_args (
	acpi_operand_object     **params,
	u32                     max_param_count,
	acpi_walk_state         *walk_state)
{
	acpi_status             status;
	u32                     index = 0;


	ACPI_FUNCTION_TRACE_PTR ("Ds_method_data_init_args", params);


	if (!params) {
		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "No param list passed to method\n"));
		return_ACPI_STATUS (AE_OK);
	}

	/* Copy passed parameters into the new method stack frame  */

	while ((index < MTH_NUM_ARGS) && (index < max_param_count) && params[index]) {
		/*
		 * A valid parameter.
		 * Store the argument in the method/walk descriptor
		 */
		status = acpi_ds_store_object_to_local (AML_ARG_OP, index, params[index],
				 walk_state);
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}

		index++;
	}

	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%d args passed to method\n", index));
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_method_data_get_node
 *
 * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 *              Index               - Which local_var or argument whose type
 *                                      to get
 *              Walk_state          - Current walk state object
 *
 * RETURN:      Get the Node associated with a local or arg.
 *
 ******************************************************************************/

acpi_status
acpi_ds_method_data_get_node (
	u16                     opcode,
	u32                     index,
	acpi_walk_state         *walk_state,
	acpi_namespace_node     **node)
{
	ACPI_FUNCTION_TRACE ("Ds_method_data_get_node");


	/*
	 * Method Locals and Arguments are supported
	 */
	switch (opcode) {
	case AML_LOCAL_OP:

		if (index > MTH_MAX_LOCAL) {
			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Local index %d is invalid (max %d)\n",
				index, MTH_MAX_LOCAL));
			return_ACPI_STATUS (AE_AML_INVALID_INDEX);
		}

		/* Return a pointer to the pseudo-node */

		*node = &walk_state->local_variables[index];
		break;

	case AML_ARG_OP:

		if (index > MTH_MAX_ARG) {
			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Arg index %d is invalid (max %d)\n",
				index, MTH_MAX_ARG));
			return_ACPI_STATUS (AE_AML_INVALID_INDEX);
		}

		/* Return a pointer to the pseudo-node */

		*node = &walk_state->arguments[index];
		break;

	default:
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Opcode %d is invalid\n", opcode));
		return_ACPI_STATUS (AE_AML_BAD_OPCODE);
	}

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_method_data_set_value
 *
 * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 *              Index               - Which local_var or argument to get
 *              Object              - Object to be inserted into the stack entry
 *              Walk_state          - Current walk state object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index.
 *
 ******************************************************************************/

acpi_status
acpi_ds_method_data_set_value (
	u16                     opcode,
	u32                     index,
	acpi_operand_object     *object,
	acpi_walk_state         *walk_state)
{
	acpi_status             status;
	acpi_namespace_node     *node;


	ACPI_FUNCTION_TRACE ("Ds_method_data_set_value");


	/* Get the namespace node for the arg/local */

	status = acpi_ds_method_data_get_node (opcode, index, walk_state, &node);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	/* Increment ref count so object can't be deleted while installed */

	acpi_ut_add_reference (object);

	/* Install the object into the stack entry */

	node->object = object;
	return_ACPI_STATUS (AE_OK);
}