1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
487 lines
14 KiB
C
487 lines
14 KiB
C
/*******************************************************************************
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*
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* Module Name: nseval - Object evaluation interfaces -- includes control
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* method lookup and execution.
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/acparser.h>
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#include <acpi/acinterp.h>
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#include <acpi/acnamesp.h>
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME ("nseval")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_evaluate_relative
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*
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* PARAMETERS: Pathname - Name of method to execute, If NULL, the
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* handle is the object to execute
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* Info - Method info block
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*
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* RETURN: Status
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*
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* DESCRIPTION: Find and execute the requested method using the handle as a
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* scope
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*
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* MUTEX: Locks Namespace
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*
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******************************************************************************/
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acpi_status
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acpi_ns_evaluate_relative (
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char *pathname,
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struct acpi_parameter_info *info)
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{
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acpi_status status;
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struct acpi_namespace_node *node = NULL;
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union acpi_generic_state *scope_info;
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char *internal_path = NULL;
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ACPI_FUNCTION_TRACE ("ns_evaluate_relative");
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/*
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* Must have a valid object handle
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*/
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if (!info || !info->node) {
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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/* Build an internal name string for the method */
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status = acpi_ns_internalize_name (pathname, &internal_path);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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scope_info = acpi_ut_create_generic_state ();
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if (!scope_info) {
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goto cleanup1;
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}
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/* Get the prefix handle and Node */
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status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE (status)) {
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goto cleanup;
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}
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info->node = acpi_ns_map_handle_to_node (info->node);
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if (!info->node) {
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(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
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status = AE_BAD_PARAMETER;
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goto cleanup;
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}
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/* Lookup the name in the namespace */
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scope_info->scope.node = info->node;
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status = acpi_ns_lookup (scope_info, internal_path, ACPI_TYPE_ANY,
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ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
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&node);
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(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE (status)) {
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Object [%s] not found [%s]\n",
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pathname, acpi_format_exception (status)));
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goto cleanup;
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}
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/*
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* Now that we have a handle to the object, we can attempt to evaluate it.
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*/
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
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pathname, node, acpi_ns_get_attached_object (node)));
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info->node = node;
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status = acpi_ns_evaluate_by_handle (info);
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n",
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pathname));
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cleanup:
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acpi_ut_delete_generic_state (scope_info);
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cleanup1:
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ACPI_MEM_FREE (internal_path);
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return_ACPI_STATUS (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_evaluate_by_name
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*
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* PARAMETERS: Pathname - Fully qualified pathname to the object
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* Info - Contains:
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* return_object - Where to put method's return value (if
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* any). If NULL, no value is returned.
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* Params - List of parameters to pass to the method,
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* terminated by NULL. Params itself may be
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* NULL if no parameters are being passed.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Find and execute the requested method passing the given
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* parameters
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*
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* MUTEX: Locks Namespace
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*
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******************************************************************************/
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acpi_status
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acpi_ns_evaluate_by_name (
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char *pathname,
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struct acpi_parameter_info *info)
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{
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acpi_status status;
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char *internal_path = NULL;
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ACPI_FUNCTION_TRACE ("ns_evaluate_by_name");
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/* Build an internal name string for the method */
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status = acpi_ns_internalize_name (pathname, &internal_path);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE (status)) {
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goto cleanup;
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}
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/* Lookup the name in the namespace */
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status = acpi_ns_lookup (NULL, internal_path, ACPI_TYPE_ANY,
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ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
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&info->node);
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(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE (status)) {
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
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"Object at [%s] was not found, status=%.4X\n",
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pathname, status));
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goto cleanup;
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}
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/*
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* Now that we have a handle to the object, we can attempt to evaluate it.
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*/
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
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pathname, info->node, acpi_ns_get_attached_object (info->node)));
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status = acpi_ns_evaluate_by_handle (info);
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n",
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pathname));
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cleanup:
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/* Cleanup */
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if (internal_path) {
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ACPI_MEM_FREE (internal_path);
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}
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return_ACPI_STATUS (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_evaluate_by_handle
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*
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* PARAMETERS: Handle - Method Node to execute
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* Params - List of parameters to pass to the method,
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* terminated by NULL. Params itself may be
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* NULL if no parameters are being passed.
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* param_type - Type of Parameter list
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* return_object - Where to put method's return value (if
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* any). If NULL, no value is returned.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Execute the requested method passing the given parameters
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*
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* MUTEX: Locks Namespace
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*
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******************************************************************************/
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acpi_status
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acpi_ns_evaluate_by_handle (
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struct acpi_parameter_info *info)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE ("ns_evaluate_by_handle");
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/* Check if namespace has been initialized */
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if (!acpi_gbl_root_node) {
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return_ACPI_STATUS (AE_NO_NAMESPACE);
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}
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/* Parameter Validation */
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if (!info) {
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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/* Initialize the return value to an invalid object */
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info->return_object = NULL;
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/* Get the prefix handle and Node */
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status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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info->node = acpi_ns_map_handle_to_node (info->node);
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if (!info->node) {
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(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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/*
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* For a method alias, we must grab the actual method node so that proper
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* scoping context will be established before execution.
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*/
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if (acpi_ns_get_type (info->node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) {
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info->node = ACPI_CAST_PTR (struct acpi_namespace_node, info->node->object);
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}
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/*
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* Two major cases here:
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* 1) The object is an actual control method -- execute it.
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* 2) The object is not a method -- just return it's current value
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*
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* In both cases, the namespace is unlocked by the acpi_ns* procedure
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*/
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if (acpi_ns_get_type (info->node) == ACPI_TYPE_METHOD) {
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/*
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* Case 1) We have an actual control method to execute
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*/
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status = acpi_ns_execute_control_method (info);
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}
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else {
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/*
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* Case 2) Object is NOT a method, just return its current value
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*/
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status = acpi_ns_get_object_value (info);
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}
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/*
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* Check if there is a return value on the stack that must be dealt with
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*/
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if (status == AE_CTRL_RETURN_VALUE) {
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/* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
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status = AE_OK;
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}
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/*
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* Namespace was unlocked by the handling acpi_ns* function, so we
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* just return
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*/
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return_ACPI_STATUS (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_execute_control_method
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*
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* PARAMETERS: Info - Method info block (w/params)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Execute the requested method passing the given parameters
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*
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* MUTEX: Assumes namespace is locked
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*
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******************************************************************************/
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acpi_status
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acpi_ns_execute_control_method (
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struct acpi_parameter_info *info)
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{
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acpi_status status;
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union acpi_operand_object *obj_desc;
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ACPI_FUNCTION_TRACE ("ns_execute_control_method");
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/* Verify that there is a method associated with this object */
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obj_desc = acpi_ns_get_attached_object (info->node);
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if (!obj_desc) {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No attached method object\n"));
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(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
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return_ACPI_STATUS (AE_NULL_OBJECT);
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}
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ACPI_DUMP_PATHNAME (info->node, "Execute Method:",
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ACPI_LV_INFO, _COMPONENT);
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ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Method at AML address %p Length %X\n",
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obj_desc->method.aml_start + 1, obj_desc->method.aml_length - 1));
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/*
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* Unlock the namespace before execution. This allows namespace access
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* via the external Acpi* interfaces while a method is being executed.
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* However, any namespace deletion must acquire both the namespace and
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* interpreter locks to ensure that no thread is using the portion of the
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* namespace that is being deleted.
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*/
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status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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/*
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* Execute the method via the interpreter. The interpreter is locked
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* here before calling into the AML parser
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*/
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status = acpi_ex_enter_interpreter ();
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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status = acpi_psx_execute (info);
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acpi_ex_exit_interpreter ();
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return_ACPI_STATUS (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ns_get_object_value
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*
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* PARAMETERS: Info - Method info block (w/params)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Return the current value of the object
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*
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* MUTEX: Assumes namespace is locked, leaves namespace unlocked
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*
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******************************************************************************/
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acpi_status
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acpi_ns_get_object_value (
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struct acpi_parameter_info *info)
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{
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acpi_status status = AE_OK;
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struct acpi_namespace_node *resolved_node = info->node;
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ACPI_FUNCTION_TRACE ("ns_get_object_value");
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/*
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* Objects require additional resolution steps (e.g., the Node may be a
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* field that must be read, etc.) -- we can't just grab the object out of
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* the node.
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*/
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/*
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* Use resolve_node_to_value() to get the associated value. This call always
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* deletes obj_desc (allocated above).
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*
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* NOTE: we can get away with passing in NULL for a walk state because
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* obj_desc is guaranteed to not be a reference to either a method local or
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* a method argument (because this interface can only be called from the
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* acpi_evaluate external interface, never called from a running method.)
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*
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* Even though we do not directly invoke the interpreter for this, we must
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* enter it because we could access an opregion. The opregion access code
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* assumes that the interpreter is locked.
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*
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* We must release the namespace lock before entering the intepreter.
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*/
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status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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status = acpi_ex_enter_interpreter ();
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if (ACPI_SUCCESS (status)) {
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status = acpi_ex_resolve_node_to_value (&resolved_node, NULL);
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/*
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* If acpi_ex_resolve_node_to_value() succeeded, the return value was placed
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* in resolved_node.
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*/
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acpi_ex_exit_interpreter ();
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if (ACPI_SUCCESS (status)) {
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status = AE_CTRL_RETURN_VALUE;
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info->return_object = ACPI_CAST_PTR
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(union acpi_operand_object, resolved_node);
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ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returning object %p [%s]\n",
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info->return_object,
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acpi_ut_get_object_type_name (info->return_object)));
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}
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}
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/* Namespace is unlocked */
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return_ACPI_STATUS (status);
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}
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