dswload.c

linux-2.6.15.6

/******************************************************************************
 *
 * Module Name: dswload - Dispatcher namespace load callbacks
 *
 *****************************************************************************/

/*
 * 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/acparser.h>
#include <acpi/amlcode.h>
#include <acpi/acdispat.h>
#include <acpi/acinterp.h>
#include <acpi/acnamesp.h>
#include <acpi/acevents.h>

#ifdef ACPI_ASL_COMPILER
#include <acpi/acdisasm.h>
#endif

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dswload")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_init_callbacks
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *              pass_number     - 1, 2, or 3
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Init walk state callbacks
 *
 ******************************************************************************/
acpi_status
acpi_ds_init_callbacks(struct acpi_walk_state *walk_state, u32 pass_number)
{

	switch (pass_number) {
	case 1:
		walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
		    ACPI_PARSE_DELETE_TREE;
		walk_state->descending_callback = acpi_ds_load1_begin_op;
		walk_state->ascending_callback = acpi_ds_load1_end_op;
		break;

	case 2:
		walk_state->parse_flags = ACPI_PARSE_LOAD_PASS1 |
		    ACPI_PARSE_DELETE_TREE;
		walk_state->descending_callback = acpi_ds_load2_begin_op;
		walk_state->ascending_callback = acpi_ds_load2_end_op;
		break;

	case 3:
#ifndef ACPI_NO_METHOD_EXECUTION
		walk_state->parse_flags |= ACPI_PARSE_EXECUTE |
		    ACPI_PARSE_DELETE_TREE;
		walk_state->descending_callback = acpi_ds_exec_begin_op;
		walk_state->ascending_callback = acpi_ds_exec_end_op;
#endif
		break;

	default:
		return (AE_BAD_PARAMETER);
	}

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_load1_begin_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *              out_op          - Where to return op if a new one is created
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 *
 ******************************************************************************/

acpi_status
acpi_ds_load1_begin_op(struct acpi_walk_state * walk_state,
		       union acpi_parse_object ** out_op)
{
	union acpi_parse_object *op;
	struct acpi_namespace_node *node;
	acpi_status status;
	acpi_object_type object_type;
	char *path;
	u32 flags;

	ACPI_FUNCTION_NAME("ds_load1_begin_op");

	op = walk_state->op;
	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
			  walk_state));

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

	if (op) {
		if (!(walk_state->op_info->flags & AML_NAMED)) {
			*out_op = op;
			return (AE_OK);
		}

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

		if (op->common.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 */

	object_type = walk_state->op_info->object_type;

	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
			  "State=%p Op=%p [%s]\n", walk_state, op,
			  acpi_ut_get_type_name(object_type)));

	switch (walk_state->opcode) {
	case AML_SCOPE_OP:

		/*
		 * The target name of the Scope() operator must exist at this point so
		 * that we can actually open the scope to enter new names underneath it.
		 * Allow search-to-root for single namesegs.
		 */
		status =
		    acpi_ns_lookup(walk_state->scope_info, path, object_type,
				   ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
				   walk_state, &(node));
#ifdef ACPI_ASL_COMPILER
		if (status == AE_NOT_FOUND) {
			/*
			 * Table disassembly:
			 * Target of Scope() not found.  Generate an External for it, and
			 * insert the name into the namespace.
			 */
			acpi_dm_add_to_external_list(path);
			status =
			    acpi_ns_lookup(walk_state->scope_info, path,
					   object_type, ACPI_IMODE_LOAD_PASS1,
					   ACPI_NS_SEARCH_PARENT, walk_state,
					   &(node));
		}
#endif
		if (ACPI_FAILURE(status)) {
			ACPI_REPORT_NSERROR(path, status);
			return (status);
		}

		/*
		 * Check to make sure that the target is
		 * one of the opcodes that actually opens a scope
		 */
		switch (node->type) {
		case ACPI_TYPE_LOCAL_SCOPE:	/* Scope  */
		case ACPI_TYPE_DEVICE:
		case ACPI_TYPE_POWER:
		case ACPI_TYPE_PROCESSOR:
		case ACPI_TYPE_THERMAL:

			/* These are acceptable types */
			break;

		case ACPI_TYPE_INTEGER:
		case ACPI_TYPE_STRING:
		case ACPI_TYPE_BUFFER:

			/*
			 * These types we will allow, but we will change the type.  This
			 * enables some existing code of the form:
			 *
			 *  Name (DEB, 0)
			 *  Scope (DEB) { ... }
			 *
			 * Note: silently change the type here.  On the second pass, we will report
			 * a warning
			 */

			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "Type override - [%4.4s] had invalid type (%s) for Scope operator, changed to (Scope)\n",
					  path,
					  acpi_ut_get_type_name(node->type)));

			node->type = ACPI_TYPE_ANY;
			walk_state->scope_info->common.value = ACPI_TYPE_ANY;
			break;

		default:

			/* All other types are an error */

			ACPI_REPORT_ERROR(("Invalid type (%s) for target of Scope operator [%4.4s] (Cannot override)\n", acpi_ut_get_type_name(node->type), path));

			return (AE_AML_OPERAND_TYPE);
		}
		break;

	default:

		/*
		 * For all other named opcodes, we will enter the name into
		 * the namespace.
		 *
		 * Setup the search flags.
		 * Since we are entering a name into the namespace, we do not want to
		 * enable the search-to-root upsearch.
		 *
		 * There are only two conditions where it is acceptable that the name
		 * already exists:
		 *    1) the Scope() operator can reopen a scoping object that was
		 *       previously defined (Scope, Method, Device, etc.)
		 *    2) Whenever we are parsing a deferred opcode (op_region, Buffer,
		 *       buffer_field, or Package), the name of the object is already
		 *       in the namespace.
		 */
		if (walk_state->deferred_node) {
			/* This name is already in the namespace, get the node */

			node = walk_state->deferred_node;
			status = AE_OK;
			break;
		}

		flags = ACPI_NS_NO_UPSEARCH;
		if ((walk_state->opcode != AML_SCOPE_OP) &&
		    (!(walk_state->parse_flags & ACPI_PARSE_DEFERRED_OP))) {
			flags |= ACPI_NS_ERROR_IF_FOUND;
			ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
					  "[%s] Cannot already exist\n",
					  acpi_ut_get_type_name(object_type)));
		} else {
			ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
					  "[%s] Both Find or Create allowed\n",
					  acpi_ut_get_type_name(object_type)));
		}

		/*
		 * 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, object_type,
				   ACPI_IMODE_LOAD_PASS1, flags, walk_state,
				   &(node));
		if (ACPI_FAILURE(status)) {
			ACPI_REPORT_NSERROR(path, status);
			return (status);
		}
		break;
	}

	/* Common exit */

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

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

	/* Initialize */

	op->named.name = node->name.integer;

#if (defined (ACPI_NO_METHOD_EXECUTION) || defined (ACPI_CONSTANT_EVAL_ONLY))
	op->named.path = (u8 *) path;
#endif

	/*
	 * Put the Node in the "op" object that the parser uses, so we
	 * can get it again quickly when this scope is closed
	 */
	op->common.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
 *
 * 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(struct acpi_walk_state * walk_state)
{
	union acpi_parse_object *op;
	acpi_object_type object_type;
	acpi_status status = AE_OK;

	ACPI_FUNCTION_NAME("ds_load1_end_op");

	op = walk_state->op;
	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
			  walk_state));

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

	if (!(walk_state->op_info->flags & (AML_NAMED | AML_FIELD))) {
		return (AE_OK);
	}

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

	object_type = walk_state->op_info->object_type;

#ifndef ACPI_NO_METHOD_EXECUTION
	if (walk_state->op_info->flags & AML_FIELD) {
		if (walk_state->opcode == AML_FIELD_OP ||
		    walk_state->opcode == AML_BANK_FIELD_OP ||
		    walk_state->opcode == AML_INDEX_FIELD_OP) {
			status = acpi_ds_init_field_objects(op, walk_state);
		}
		return (status);
	}

	if (op->common.aml_opcode == AML_REGION_OP) {
		status = acpi_ex_create_region(op->named.data, op->named.length,
					       (acpi_adr_space_type)
					       ((op->common.value.arg)->common.
						value.integer), walk_state);
		if (ACPI_FAILURE(status)) {
			return (status);
		}
	}
#endif

	if (op->common.aml_opcode == AML_NAME_OP) {
		/* For Name opcode, get the object type from the argument */

		if (op->common.value.arg) {
			object_type = (acpi_ps_get_opcode_info((op->common.
								value.arg)->
							       common.
							       aml_opcode))->
			    object_type;
			op->common.node->type = (u8) object_type;
		}
	}

	if (op->common.aml_opcode == AML_METHOD_OP) {
		/*
		 * method_op pkg_length name_string method_flags term_list
		 *
		 * Note: We must create the method node/object pair as soon as we
		 * see the method declaration.  This allows later pass1 parsing
		 * of invocations of the method (need to know the number of
		 * arguments.)
		 */
		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
				  "LOADING-Method: State=%p Op=%p named_obj=%p\n",
				  walk_state, op, op->named.node));

		if (!acpi_ns_get_attached_object(op->named.node)) {
			walk_state->operands[0] = (void *)op->named.node;
			walk_state->num_operands = 1;

			status =
			    acpi_ds_create_operands(walk_state,
						    op->common.value.arg);
			if (ACPI_SUCCESS(status)) {
				status = acpi_ex_create_method(op->named.data,
							       op->named.length,
							       walk_state);
			}
			walk_state->operands[0] = NULL;
			walk_state->num_operands = 0;

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

	/* Pop the scope stack */

	if (acpi_ns_opens_scope(object_type)) {
		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
				  "(%s): Popping scope for Op %p\n",
				  acpi_ut_get_type_name(object_type), op));

		status = acpi_ds_scope_stack_pop(walk_state);
	}

	return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_load2_begin_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *              out_op          - Wher to return op if a new one is created
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Descending callback used during the loading of ACPI tables.
 *
 ******************************************************************************/

acpi_status
acpi_ds_load2_begin_op(struct acpi_walk_state * walk_state,
		       union acpi_parse_object ** out_op)
{
	union acpi_parse_object *op;
	struct acpi_namespace_node *node;
	acpi_status status;
	acpi_object_type object_type;
	char *buffer_ptr;

	ACPI_FUNCTION_TRACE("ds_load2_begin_op");

	op = walk_state->op;
	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
			  walk_state));

	if (op) {
		if ((walk_state->control_state) &&
		    (walk_state->control_state->common.state ==
		     ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
			/* We are executing a while loop outside of a method */

			status = acpi_ds_exec_begin_op(walk_state, out_op);
			return_ACPI_STATUS(status);
		}

		/* We only care about Namespace opcodes here */

		if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
		     (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
		    (!(walk_state->op_info->flags & AML_NAMED))) {
#ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
			if ((walk_state->op_info->class == AML_CLASS_EXECUTE) ||
			    (walk_state->op_info->class == AML_CLASS_CONTROL)) {

				ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
						  "Begin/EXEC: %s (fl %8.8X)\n",
						  walk_state->op_info->name,
						  walk_state->op_info->flags));

				/* Executing a type1 or type2 opcode outside of a method */

				status =
				    acpi_ds_exec_begin_op(walk_state, out_op);
				return_ACPI_STATUS(status);
			}
#endif
			return_ACPI_STATUS(AE_OK);
		}

		/* Get the name we are going to enter or lookup in the namespace */

		if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
			/* For Namepath op, get the path string */