drivers/acpi/parser/psxface.c

/******************************************************************************
 *
 * Module Name: psxface - Parser external interfaces
 *
 *****************************************************************************/

/*
 * 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/acdispat.h>
#include <acpi/acinterp.h>

#define _COMPONENT          ACPI_PARSER
ACPI_MODULE_NAME("psxface")

/* Local Prototypes */
static acpi_status acpi_ps_execute_pass(struct acpi_parameter_info *info);

static void
acpi_ps_update_parameter_list(struct acpi_parameter_info *info, u16 action);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_execute_method
 *
 * PARAMETERS:  Info            - Method info block, contains:
 *                  Node            - Method Node to execute
 *                  obj_desc        - Method object
 *                  Parameters      - List of parameters to pass to the method,
 *                                    terminated by NULL. Params itself may be
 *                                    NULL if no parameters are being passed.
 *                  return_object   - Where to put method's return value (if
 *                                    any). If NULL, no value is returned.
 *                  parameter_type  - Type of Parameter list
 *                  return_object   - Where to put method's return value (if
 *                                    any). If NULL, no value is returned.
 *                  pass_number     - Parse or execute pass
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute a control method
 *
 ******************************************************************************/

acpi_status acpi_ps_execute_method(struct acpi_parameter_info *info)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE("ps_execute_method");

	/* Validate the Info and method Node */

	if (!info || !info->node) {
		return_ACPI_STATUS(AE_NULL_ENTRY);
	}

	/* Init for new method, wait on concurrency semaphore */

	status =
	    acpi_ds_begin_method_execution(info->node, info->obj_desc, NULL);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * The caller "owns" the parameters, so give each one an extra
	 * reference
	 */
	acpi_ps_update_parameter_list(info, REF_INCREMENT);

	/*
	 * 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",
			  info->node, info->obj_desc));

	info->pass_number = 1;
	status = acpi_ps_execute_pass(info);
	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	/*
	 * 2) Execute the method. Performs second pass parse simultaneously
	 */
	ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
			  "**** Begin Method Execution **** Entry=%p obj=%p\n",
			  info->node, info->obj_desc));

	info->pass_number = 3;
	status = acpi_ps_execute_pass(info);

      cleanup:

	/* Take away the extra reference that we gave the parameters above */

	acpi_ps_update_parameter_list(info, REF_DECREMENT);

	/* Exit now if error above */

	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 (info->return_object) {
		ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
				  "Method returned obj_desc=%p\n",
				  info->return_object));
		ACPI_DUMP_STACK_ENTRY(info->return_object);

		status = AE_CTRL_RETURN_VALUE;
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_update_parameter_list
 *
 * PARAMETERS:  Info            - See struct acpi_parameter_info
 *                                (Used: parameter_type and Parameters)
 *              Action          - Add or Remove reference
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Update reference count on all method parameter objects
 *
 ******************************************************************************/

static void
acpi_ps_update_parameter_list(struct acpi_parameter_info *info, u16 action)
{
	acpi_native_uint i;

	if ((info->parameter_type == ACPI_PARAM_ARGS) && (info->parameters)) {
		/* Update reference count for each parameter */

		for (i = 0; info->parameters[i]; i++) {
			/* Ignore errors, just do them all */

			(void)acpi_ut_update_object_reference(info->
							      parameters[i],
							      action);
		}
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ps_execute_pass
 *
 * PARAMETERS:  Info            - See struct acpi_parameter_info
 *                                (Used: pass_number, Node, and obj_desc)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Single AML pass: Parse or Execute a control method
 *
 ******************************************************************************/

static acpi_status acpi_ps_execute_pass(struct acpi_parameter_info *info)
{
	acpi_status status;
	union acpi_parse_object *op;
	struct acpi_walk_state *walk_state;

	ACPI_FUNCTION_TRACE("ps_execute_pass");

	/* Create and init a Root Node */

	op = acpi_ps_create_scope_op();
	if (!op) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Create and initialize a new walk state */

	walk_state =
	    acpi_ds_create_walk_state(info->obj_desc->method.owner_id, NULL,
				      NULL, NULL);
	if (!walk_state) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	status = acpi_ds_init_aml_walk(walk_state, op, info->node,
				       info->obj_desc->method.aml_start,
				       info->obj_desc->method.aml_length,
				       info->pass_number == 1 ? NULL : info,
				       info->pass_number);
	if (ACPI_FAILURE(status)) {
		acpi_ds_delete_walk_state(walk_state);
		goto cleanup;
	}

	/* Parse the AML */

	status = acpi_ps_parse_aml(walk_state);

	/* Walk state was deleted by parse_aml */

      cleanup:
	acpi_ps_delete_parse_tree(op);
	return_ACPI_STATUS(status);
}