text: /******************************************************************************
   *
   * Module Name: psxface - Parser external interfaces
   *
   *****************************************************************************/
  
  /*
   * Copyright (C) 2000 - 2004, 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/acdispat.h>
  #include <acpi/acinterp.h>
  #include <acpi/acnamesp.h>
  
  
  #define _COMPONENT          ACPI_PARSER
  	 ACPI_MODULE_NAME    ("psxface")
  
  
  /*******************************************************************************
   *
   * FUNCTION:    acpi_psx_execute
   *
   * PARAMETERS:  method_node         - A method object containing both the AML
   *                                    address and length.
   *              **Params            - List of parameters to pass to method,
   *                                    terminated by NULL. Params itself may be
   *                                    NULL if no parameters are being passed.
   *              **return_obj_desc   - Return object from execution of the
   *                                    method.
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Execute a control method
   *
   ******************************************************************************/
  
  acpi_status
  acpi_psx_execute (
  	struct acpi_namespace_node      *method_node,
  	union acpi_operand_object       **params,
  	union acpi_operand_object       **return_obj_desc)
  {
  	acpi_status                     status;
  	union acpi_operand_object       *obj_desc;
  	u32                             i;
  	union acpi_parse_object         *op;
  	struct acpi_walk_state          *walk_state;
  
  
  	ACPI_FUNCTION_TRACE ("psx_execute");
  
  
  	/* Validate the Node and get the attached object */
  
  	if (!method_node) {
  		return_ACPI_STATUS (AE_NULL_ENTRY);
  	}
  
  	obj_desc = acpi_ns_get_attached_object (method_node);
  	if (!obj_desc) {
  		return_ACPI_STATUS (AE_NULL_OBJECT);
  	}
  
  	/* Init for new method, wait on concurrency semaphore */
  
  	status = acpi_ds_begin_method_execution (method_node, obj_desc, NULL);
  	if (ACPI_FAILURE (status)) {
  		return_ACPI_STATUS (status);
  	}
  
  	if (params) {
  		/*
  		 * The caller "owns" the parameters, so give each one an extra
  		 * reference
  		 */
  		for (i = 0; params[i]; i++) {
  			acpi_ut_add_reference (params[i]);
  		}
  	}
  
  	/*
  	 * 1) Perform the first pass parse of the method to enter any
  	 * named objects that it creates into the namespace
  	 */
  	ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
  		"**** Begin Method Parse **** Entry=%p obj=%p\n",
  		method_node, obj_desc));
  
  	/* Create and init a Root Node */
  
  	op = acpi_ps_create_scope_op ();
  	if (!op) {
  		status = AE_NO_MEMORY;
  		goto cleanup1;
  	}
  
  	/*
  	 * Get a new owner_id for objects created by this method. Namespace
  	 * objects (such as Operation Regions) can be created during the
  	 * first pass parse.
  	 */
  	obj_desc->method.owning_id = acpi_ut_allocate_owner_id (ACPI_OWNER_TYPE_METHOD);
  
  	/* Create and initialize a new walk state */
  
  	walk_state = acpi_ds_create_walk_state (obj_desc->method.owning_id,
  			   NULL, NULL, NULL);
  	if (!walk_state) {
  		status = AE_NO_MEMORY;
  		goto cleanup2;
  	}
  
  	status = acpi_ds_init_aml_walk (walk_state, op, method_node, obj_desc->method.aml_start,
  			  obj_desc->method.aml_length, NULL, NULL, 1);
  	if (ACPI_FAILURE (status)) {
  		goto cleanup3;
  	}
  
  	/* Parse the AML */
  
  	status = acpi_ps_parse_aml (walk_state);
  	acpi_ps_delete_parse_tree (op);
  	if (ACPI_FAILURE (status)) {
  		goto cleanup1; /* Walk state is already deleted */
  
  	}
  
  	/*
  	 * 2) Execute the method.  Performs second pass parse simultaneously
  	 */
  	ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
  		"**** Begin Method Execution **** Entry=%p obj=%p\n",
  		method_node, obj_desc));
  
  	/* Create and init a Root Node */
  
  	op = acpi_ps_create_scope_op ();
  	if (!op) {
  		status = AE_NO_MEMORY;
  		goto cleanup1;
  	}
  
  	/* Init new op with the method name and pointer back to the NS node */
  
  	acpi_ps_set_name (op, method_node->name.integer);
  	op->common.node = method_node;
  
  	/* Create and initialize a new walk state */
  
  	walk_state = acpi_ds_create_walk_state (0, NULL, NULL, NULL);
  	if (!walk_state) {
  		status = AE_NO_MEMORY;
  		goto cleanup2;
  	}
  
  	status = acpi_ds_init_aml_walk (walk_state, op, method_node, obj_desc->method.aml_start,
  			  obj_desc->method.aml_length, params, return_obj_desc, 3);
  	if (ACPI_FAILURE (status)) {
  		goto cleanup3;
  	}
  
  	/*
  	 * The walk of the parse tree is where we actually execute the method
  	 */
  	status = acpi_ps_parse_aml (walk_state);
  	goto cleanup2; /* Walk state already deleted */
  
  
  cleanup3:
  	acpi_ds_delete_walk_state (walk_state);
  
  cleanup2:
  	acpi_ps_delete_parse_tree (op);
  
  cleanup1:
  	if (params) {
  		/* Take away the extra reference that we gave the parameters above */
  
  		for (i = 0; params[i]; i++) {
  			/* Ignore errors, just do them all */
  
  			(void) acpi_ut_update_object_reference (params[i], REF_DECREMENT);
  		}
  	}
  
  	if (ACPI_FAILURE (status)) {
  		return_ACPI_STATUS (status);
  	}
  
  	/*
  	 * If the method has returned an object, signal this to the caller with
  	 * a control exception code
  	 */
  	if (*return_obj_desc) {
  		ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Method returned obj_desc=%p\n",
  			*return_obj_desc));
  		ACPI_DUMP_STACK_ENTRY (*return_obj_desc);
  
  		status = AE_CTRL_RETURN_VALUE;
  	}
  
  	return_ACPI_STATUS (status);
  }
  
  
  