dswload.c

winNT技术操作系统,国外开放的原代码和LIUX一样

/******************************************************************************
 *
 * Module Name: dswload - Dispatcher namespace load callbacks
 *              $Revision: 1.1 $
 *
 *****************************************************************************/

/*
 *  Copyright (C) 2000, 2001 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>

#define _COMPONENT          ACPI_DISPATCHER
	 MODULE_NAME         ("dswload")


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_load1_begin_op
 *
 * PARAMETERS:  Walk_state      - Current state of the parse tree walk
 *              Op              - Op that has been just been reached in the
 *                                walk;  Arguments have not been evaluated yet.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 *
 ******************************************************************************/

ACPI_STATUS
acpi_ds_load1_begin_op (
	u16                     opcode,
	ACPI_PARSE_OBJECT       *op,
	ACPI_WALK_STATE         *walk_state,
	ACPI_PARSE_OBJECT       **out_op)
{
	ACPI_NAMESPACE_NODE     *node;
	ACPI_STATUS             status;
	OBJECT_TYPE_INTERNAL    data_type;
	NATIVE_CHAR             *path;


	/* We are only interested in opcodes that have an associated name */

	if (!acpi_ps_is_named_op (opcode)) {
		*out_op = op;
		return (AE_OK);
	}


	/* Check if this object has already been installed in the namespace */

	if (op && op->node) {
		*out_op = op;
		return (AE_OK);
	}

	path = acpi_ps_get_next_namestring (walk_state->parser_state);

	/* Map the raw opcode into an internal object type */

	data_type = acpi_ds_map_named_opcode_to_data_type (opcode);



	/*
	 * Enter the named type into the internal namespace.  We enter the name
	 * as we go downward in the parse tree.  Any necessary subobjects that involve
	 * arguments to the opcode must be created as we go back up the parse tree later.
	 */
	status = acpi_ns_lookup (walk_state->scope_info, path,
			 data_type, IMODE_LOAD_PASS1,
			 NS_NO_UPSEARCH, walk_state, &(node));

	if (ACPI_FAILURE (status)) {
		return (status);
	}

	if (!op) {
		/* Create a new op */

		op = acpi_ps_alloc_op (opcode);
		if (!op) {
			return (AE_NO_MEMORY);
		}
	}

	/* Initialize */

	((ACPI_PARSE2_OBJECT *)op)->name = node->name;

	/*
	 * Put the Node in the "op" object that the parser uses, so we
	 * can get it again quickly when this scope is closed
	 */
	op->node = node;


	acpi_ps_append_arg (acpi_ps_get_parent_scope (walk_state->parser_state), op);

	*out_op = op;

	return (status);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_load1_end_op
 *
 * PARAMETERS:  Walk_state      - Current state of the parse tree walk
 *              Op              - Op that has been just been completed in the
 *                                walk;  Arguments have now been evaluated.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Ascending callback used during the loading of the namespace,
 *              both control methods and everything else.
 *
 ******************************************************************************/

ACPI_STATUS
acpi_ds_load1_end_op (
	ACPI_WALK_STATE         *walk_state,
	ACPI_PARSE_OBJECT       *op)
{
	OBJECT_TYPE_INTERNAL    data_type;


	/* We are only interested in opcodes that have an associated name */

	if (!acpi_ps_is_named_op (op->opcode)) {
		return (AE_OK);
	}


	/* Get the type to determine if we should pop the scope */

	data_type = acpi_ds_map_named_opcode_to_data_type (op->opcode);

	if (op->opcode == AML_NAME_OP) {
		/* For Name opcode, check the argument */

		if (op->value.arg) {
			data_type = acpi_ds_map_opcode_to_data_type (
					  (op->value.arg)->opcode, NULL);
			((ACPI_NAMESPACE_NODE *)op->node)->type =
					  (u8) data_type;
		}
	}


	/* Pop the scope stack */

	if (acpi_ns_opens_scope (data_type)) {

		acpi_ds_scope_stack_pop (walk_state);
	}

	return (AE_OK);

}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_load2_begin_op
 *
 * PARAMETERS:  Walk_state      - Current state of the parse tree walk
 *              Op              - Op that has been just been reached in the
 *                                walk;  Arguments have not been evaluated yet.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 *
 ******************************************************************************/

ACPI_STATUS
acpi_ds_load2_begin_op (
	u16                     opcode,
	ACPI_PARSE_OBJECT       *op,
	ACPI_WALK_STATE         *walk_state,
	ACPI_PARSE_OBJECT       **out_op)
{
	ACPI_NAMESPACE_NODE     *node;
	ACPI_STATUS             status;
	OBJECT_TYPE_INTERNAL    data_type;
	NATIVE_CHAR             *buffer_ptr;
	void                    *original = NULL;


	/* We only care about Namespace opcodes here */

	if (!acpi_ps_is_namespace_op (opcode) &&
		opcode != AML_NAMEPATH_OP) {
		return (AE_OK);
	}


	/* Temp! same code as in psparse */

	if (!acpi_ps_is_named_op (opcode)) {
		return (AE_OK);
	}

	if (op) {
		/*
		 * Get the name we are going to enter or lookup in the namespace
		 */
		if (opcode == AML_NAMEPATH_OP) {
			/* For Namepath op, get the path string */

			buffer_ptr = op->value.string;
			if (!buffer_ptr) {
				/* No name, just exit */

				return (AE_OK);
			}
		}

		else {
			/* Get name from the op */

			buffer_ptr = (NATIVE_CHAR *) &((ACPI_PARSE2_OBJECT *)op)->name;
		}
	}

	else {
		buffer_ptr = acpi_ps_get_next_namestring (walk_state->parser_state);
	}


	/* Map the raw opcode into an internal object type */

	data_type = acpi_ds_map_named_opcode_to_data_type (opcode);


	if (opcode == AML_DEF_FIELD_OP      ||
		opcode == AML_BANK_FIELD_OP     ||
		opcode == AML_INDEX_FIELD_OP) {
		node = NULL;
		status = AE_OK;
	}

	else if (opcode == AML_NAMEPATH_OP) {
		/*
		 * The Name_path is an object reference to an existing object. Don't enter the
		 * name into the namespace, but look it up for use later
		 */
		status = acpi_ns_lookup (walk_state->scope_info, buffer_ptr,
				 data_type, IMODE_EXECUTE,
				 NS_SEARCH_PARENT, walk_state,
				 &(node));
	}

	else {
		if (op && op->node) {
			original = op->node;
			node = op->node;

			if (acpi_ns_opens_scope (data_type)) {
				status = acpi_ds_scope_stack_push (node,
						   data_type,
						   walk_state);
				if (ACPI_FAILURE (status)) {
					return (status);
				}

			}
			return (AE_OK);
		}

		/*
		 * Enter the named type into the internal namespace.  We enter the name
		 * as we go downward in the parse tree.  Any necessary subobjects that involve
		 * arguments to the opcode must be created as we go back up the parse tree later.
		 */
		status = acpi_ns_lookup (walk_state->scope_info, buffer_ptr,
				 data_type, IMODE_EXECUTE,
				 NS_NO_UPSEARCH, walk_state,
				 &(node));
	}

	if (ACPI_SUCCESS (status)) {
		if (!op) {
			/* Create a new op */

			op = acpi_ps_alloc_op (opcode);
			if (!op) {
				return (AE_NO_MEMORY);
			}

			/* Initialize */

			((ACPI_PARSE2_OBJECT *)op)->name = node->name;
			*out_op = op;
		}


		/*
		 * Put the Node in the "op" object that the parser uses, so we
		 * can get it again quickly when this scope is closed
		 */
		op->node = node;

	}


	return (status);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_load2_end_op
 *
 * PARAMETERS:  Walk_state      - Current state of the parse tree walk
 *              Op              - Op that has been just been completed in the
 *                                walk;  Arguments have now been evaluated.