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!
598 lines
18 KiB
C
598 lines
18 KiB
C
/******************************************************************************
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*
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* Module Name: dsmethod - Parser/Interpreter interface - control method parsing
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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/amlcode.h>
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#include <acpi/acdispat.h>
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#include <acpi/acinterp.h>
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#include <acpi/acnamesp.h>
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#define _COMPONENT ACPI_DISPATCHER
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ACPI_MODULE_NAME ("dsmethod")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_parse_method
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*
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* PARAMETERS: obj_handle - Method node
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*
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* RETURN: Status
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*
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* DESCRIPTION: Call the parser and parse the AML that is associated with the
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* method.
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*
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* MUTEX: Assumes parser is locked
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*
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******************************************************************************/
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acpi_status
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acpi_ds_parse_method (
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acpi_handle obj_handle)
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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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union acpi_parse_object *op;
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struct acpi_namespace_node *node;
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acpi_owner_id owner_id;
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struct acpi_walk_state *walk_state;
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ACPI_FUNCTION_TRACE_PTR ("ds_parse_method", obj_handle);
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/* Parameter Validation */
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if (!obj_handle) {
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return_ACPI_STATUS (AE_NULL_ENTRY);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "**** Parsing [%4.4s] **** named_obj=%p\n",
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acpi_ut_get_node_name (obj_handle), obj_handle));
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/* Extract the method object from the method Node */
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node = (struct acpi_namespace_node *) obj_handle;
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obj_desc = acpi_ns_get_attached_object (node);
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if (!obj_desc) {
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return_ACPI_STATUS (AE_NULL_OBJECT);
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}
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/* Create a mutex for the method if there is a concurrency limit */
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if ((obj_desc->method.concurrency != ACPI_INFINITE_CONCURRENCY) &&
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(!obj_desc->method.semaphore)) {
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status = acpi_os_create_semaphore (obj_desc->method.concurrency,
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obj_desc->method.concurrency,
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&obj_desc->method.semaphore);
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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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/*
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* Allocate a new parser op to be the root of the parsed
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* method tree
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*/
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op = acpi_ps_alloc_op (AML_METHOD_OP);
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if (!op) {
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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/* Init new op with the method name and pointer back to the Node */
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acpi_ps_set_name (op, node->name.integer);
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op->common.node = node;
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/*
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* Get a new owner_id for objects created by this method. Namespace
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* objects (such as Operation Regions) can be created during the
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* first pass parse.
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*/
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owner_id = acpi_ut_allocate_owner_id (ACPI_OWNER_TYPE_METHOD);
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obj_desc->method.owning_id = owner_id;
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/* Create and initialize a new walk state */
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walk_state = acpi_ds_create_walk_state (owner_id, NULL, NULL, NULL);
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if (!walk_state) {
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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status = acpi_ds_init_aml_walk (walk_state, op, node,
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obj_desc->method.aml_start,
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obj_desc->method.aml_length, NULL, 1);
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if (ACPI_FAILURE (status)) {
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acpi_ds_delete_walk_state (walk_state);
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return_ACPI_STATUS (status);
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}
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/*
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* Parse the method, first pass
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*
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* The first pass load is where newly declared named objects are
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* added into the namespace. Actual evaluation of
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* the named objects (what would be called a "second
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* pass") happens during the actual execution of the
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* method so that operands to the named objects can
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* take on dynamic run-time values.
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*/
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status = acpi_ps_parse_aml (walk_state);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
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"**** [%4.4s] Parsed **** named_obj=%p Op=%p\n",
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acpi_ut_get_node_name (obj_handle), obj_handle, op));
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acpi_ps_delete_parse_tree (op);
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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_ds_begin_method_execution
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*
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* PARAMETERS: method_node - Node of the method
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* obj_desc - The method object
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* calling_method_node - Caller of this method (if non-null)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Prepare a method for execution. Parses the method if necessary,
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* increments the thread count, and waits at the method semaphore
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* for clearance to execute.
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*
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******************************************************************************/
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acpi_status
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acpi_ds_begin_method_execution (
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struct acpi_namespace_node *method_node,
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union acpi_operand_object *obj_desc,
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struct acpi_namespace_node *calling_method_node)
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{
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE_PTR ("ds_begin_method_execution", method_node);
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if (!method_node) {
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return_ACPI_STATUS (AE_NULL_ENTRY);
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}
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/*
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* If there is a concurrency limit on this method, we need to
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* obtain a unit from the method semaphore.
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*/
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if (obj_desc->method.semaphore) {
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/*
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* Allow recursive method calls, up to the reentrancy/concurrency
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* limit imposed by the SERIALIZED rule and the sync_level method
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* parameter.
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*
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* The point of this code is to avoid permanently blocking a
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* thread that is making recursive method calls.
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*/
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if (method_node == calling_method_node) {
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if (obj_desc->method.thread_count >= obj_desc->method.concurrency) {
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return_ACPI_STATUS (AE_AML_METHOD_LIMIT);
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}
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}
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/*
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* Get a unit from the method semaphore. This releases the
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* interpreter if we block
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*/
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status = acpi_ex_system_wait_semaphore (obj_desc->method.semaphore,
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ACPI_WAIT_FOREVER);
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}
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/*
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* Increment the method parse tree thread count since it has been
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* reentered one more time (even if it is the same thread)
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*/
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obj_desc->method.thread_count++;
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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_ds_call_control_method
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*
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* PARAMETERS: Thread - Info for this thread
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* this_walk_state - Current walk state
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* Op - Current Op to be walked
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*
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* RETURN: Status
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*
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* DESCRIPTION: Transfer execution to a called control method
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*
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******************************************************************************/
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acpi_status
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acpi_ds_call_control_method (
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struct acpi_thread_state *thread,
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struct acpi_walk_state *this_walk_state,
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union acpi_parse_object *op)
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{
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acpi_status status;
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struct acpi_namespace_node *method_node;
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struct acpi_walk_state *next_walk_state;
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union acpi_operand_object *obj_desc;
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struct acpi_parameter_info info;
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u32 i;
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ACPI_FUNCTION_TRACE_PTR ("ds_call_control_method", this_walk_state);
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Execute method %p, currentstate=%p\n",
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this_walk_state->prev_op, this_walk_state));
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/*
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* Get the namespace entry for the control method we are about to call
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*/
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method_node = this_walk_state->method_call_node;
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if (!method_node) {
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return_ACPI_STATUS (AE_NULL_ENTRY);
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}
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obj_desc = acpi_ns_get_attached_object (method_node);
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if (!obj_desc) {
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return_ACPI_STATUS (AE_NULL_OBJECT);
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}
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obj_desc->method.owning_id = acpi_ut_allocate_owner_id (ACPI_OWNER_TYPE_METHOD);
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/* Init for new method, wait on concurrency semaphore */
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status = acpi_ds_begin_method_execution (method_node, obj_desc,
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this_walk_state->method_node);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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if (!(obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY)) {
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/* 1) Parse: Create a new walk state for the preempting walk */
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next_walk_state = acpi_ds_create_walk_state (obj_desc->method.owning_id,
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op, obj_desc, NULL);
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if (!next_walk_state) {
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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/* Create and init a Root Node */
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op = acpi_ps_create_scope_op ();
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if (!op) {
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status = AE_NO_MEMORY;
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goto cleanup;
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}
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status = acpi_ds_init_aml_walk (next_walk_state, op, method_node,
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obj_desc->method.aml_start, obj_desc->method.aml_length,
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NULL, 1);
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if (ACPI_FAILURE (status)) {
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acpi_ds_delete_walk_state (next_walk_state);
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goto cleanup;
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}
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/* Begin AML parse */
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status = acpi_ps_parse_aml (next_walk_state);
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acpi_ps_delete_parse_tree (op);
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}
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/* 2) Execute: Create a new state for the preempting walk */
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next_walk_state = acpi_ds_create_walk_state (obj_desc->method.owning_id,
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NULL, obj_desc, thread);
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if (!next_walk_state) {
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status = AE_NO_MEMORY;
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goto cleanup;
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}
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/*
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* The resolved arguments were put on the previous walk state's operand
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* stack. Operands on the previous walk state stack always
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* start at index 0.
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* Null terminate the list of arguments
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*/
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this_walk_state->operands [this_walk_state->num_operands] = NULL;
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info.parameters = &this_walk_state->operands[0];
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info.parameter_type = ACPI_PARAM_ARGS;
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status = acpi_ds_init_aml_walk (next_walk_state, NULL, method_node,
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obj_desc->method.aml_start, obj_desc->method.aml_length,
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&info, 3);
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if (ACPI_FAILURE (status)) {
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goto cleanup;
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}
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/*
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* Delete the operands on the previous walkstate operand stack
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* (they were copied to new objects)
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*/
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for (i = 0; i < obj_desc->method.param_count; i++) {
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acpi_ut_remove_reference (this_walk_state->operands [i]);
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this_walk_state->operands [i] = NULL;
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}
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/* Clear the operand stack */
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this_walk_state->num_operands = 0;
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
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"Starting nested execution, newstate=%p\n", next_walk_state));
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if (obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) {
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status = obj_desc->method.implementation (next_walk_state);
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return_ACPI_STATUS (status);
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}
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return_ACPI_STATUS (AE_OK);
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/* On error, we must delete the new walk state */
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cleanup:
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if (next_walk_state && (next_walk_state->method_desc)) {
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/* Decrement the thread count on the method parse tree */
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next_walk_state->method_desc->method.thread_count--;
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}
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(void) acpi_ds_terminate_control_method (next_walk_state);
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acpi_ds_delete_walk_state (next_walk_state);
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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_ds_restart_control_method
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*
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* PARAMETERS: walk_state - State for preempted method (caller)
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* return_desc - Return value from the called method
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*
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* RETURN: Status
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*
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* DESCRIPTION: Restart a method that was preempted by another (nested) method
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* invocation. Handle the return value (if any) from the callee.
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*
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******************************************************************************/
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acpi_status
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acpi_ds_restart_control_method (
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struct acpi_walk_state *walk_state,
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union acpi_operand_object *return_desc)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE_PTR ("ds_restart_control_method", walk_state);
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
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"****Restart [%4.4s] Op %p return_value_from_callee %p\n",
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(char *) &walk_state->method_node->name, walk_state->method_call_op,
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return_desc));
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
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" return_from_this_method_used?=%X res_stack %p Walk %p\n",
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walk_state->return_used,
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walk_state->results, walk_state));
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/* Did the called method return a value? */
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if (return_desc) {
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/* Are we actually going to use the return value? */
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if (walk_state->return_used) {
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/* Save the return value from the previous method */
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status = acpi_ds_result_push (return_desc, walk_state);
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if (ACPI_FAILURE (status)) {
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acpi_ut_remove_reference (return_desc);
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return_ACPI_STATUS (status);
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}
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/*
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* Save as THIS method's return value in case it is returned
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* immediately to yet another method
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*/
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walk_state->return_desc = return_desc;
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}
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/*
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* The following code is the
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* optional support for a so-called "implicit return". Some AML code
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* assumes that the last value of the method is "implicitly" returned
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* to the caller. Just save the last result as the return value.
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* NOTE: this is optional because the ASL language does not actually
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* support this behavior.
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*/
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else if (!acpi_ds_do_implicit_return (return_desc, walk_state, FALSE)) {
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/*
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* Delete the return value if it will not be used by the
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* calling method
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*/
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acpi_ut_remove_reference (return_desc);
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}
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}
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_terminate_control_method
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*
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* PARAMETERS: walk_state - State of the method
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*
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* RETURN: Status
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*
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* DESCRIPTION: Terminate a control method. Delete everything that the method
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* created, delete all locals and arguments, and delete the parse
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* tree if requested.
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*
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******************************************************************************/
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acpi_status
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acpi_ds_terminate_control_method (
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struct acpi_walk_state *walk_state)
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{
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union acpi_operand_object *obj_desc;
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struct acpi_namespace_node *method_node;
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acpi_status status;
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ACPI_FUNCTION_TRACE_PTR ("ds_terminate_control_method", walk_state);
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if (!walk_state) {
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return (AE_BAD_PARAMETER);
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}
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/* The current method object was saved in the walk state */
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obj_desc = walk_state->method_desc;
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if (!obj_desc) {
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return_ACPI_STATUS (AE_OK);
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}
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/* Delete all arguments and locals */
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acpi_ds_method_data_delete_all (walk_state);
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/*
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* Lock the parser while we terminate this method.
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* If this is the last thread executing the method,
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* we have additional cleanup to perform
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*/
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status = acpi_ut_acquire_mutex (ACPI_MTX_PARSER);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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/* Signal completion of the execution of this method if necessary */
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if (walk_state->method_desc->method.semaphore) {
|
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status = acpi_os_signal_semaphore (
|
|
walk_state->method_desc->method.semaphore, 1);
|
|
if (ACPI_FAILURE (status)) {
|
|
ACPI_REPORT_ERROR (("Could not signal method semaphore\n"));
|
|
status = AE_OK;
|
|
|
|
/* Ignore error and continue cleanup */
|
|
}
|
|
}
|
|
|
|
if (walk_state->method_desc->method.thread_count) {
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
|
|
"*** Not deleting method namespace, there are still %d threads\n",
|
|
walk_state->method_desc->method.thread_count));
|
|
}
|
|
|
|
if (!walk_state->method_desc->method.thread_count) {
|
|
/*
|
|
* Support to dynamically change a method from not_serialized to
|
|
* Serialized if it appears that the method is written foolishly and
|
|
* does not support multiple thread execution. The best example of this
|
|
* is if such a method creates namespace objects and blocks. A second
|
|
* thread will fail with an AE_ALREADY_EXISTS exception
|
|
*
|
|
* This code is here because we must wait until the last thread exits
|
|
* before creating the synchronization semaphore.
|
|
*/
|
|
if ((walk_state->method_desc->method.concurrency == 1) &&
|
|
(!walk_state->method_desc->method.semaphore)) {
|
|
status = acpi_os_create_semaphore (1,
|
|
1,
|
|
&walk_state->method_desc->method.semaphore);
|
|
}
|
|
|
|
/*
|
|
* There are no more threads executing this method. Perform
|
|
* additional cleanup.
|
|
*
|
|
* The method Node is stored in the walk state
|
|
*/
|
|
method_node = walk_state->method_node;
|
|
|
|
/*
|
|
* Delete any namespace entries created immediately underneath
|
|
* the method
|
|
*/
|
|
status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
|
|
if (ACPI_FAILURE (status)) {
|
|
return_ACPI_STATUS (status);
|
|
}
|
|
|
|
if (method_node->child) {
|
|
acpi_ns_delete_namespace_subtree (method_node);
|
|
}
|
|
|
|
/*
|
|
* Delete any namespace entries created anywhere else within
|
|
* the namespace
|
|
*/
|
|
acpi_ns_delete_namespace_by_owner (walk_state->method_desc->method.owning_id);
|
|
status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
|
|
if (ACPI_FAILURE (status)) {
|
|
return_ACPI_STATUS (status);
|
|
}
|
|
}
|
|
|
|
status = acpi_ut_release_mutex (ACPI_MTX_PARSER);
|
|
return_ACPI_STATUS (status);
|
|
}
|
|
|
|
|