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!
745 lines
22 KiB
C
745 lines
22 KiB
C
/*******************************************************************************
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*
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* Module Name: dsutils - Dispatcher utilities
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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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#include <acpi/acdebug.h>
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#define _COMPONENT ACPI_DISPATCHER
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ACPI_MODULE_NAME ("dsutils")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_clear_implicit_return
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*
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* PARAMETERS: walk_state - Current State
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*
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* RETURN: None.
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*
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* DESCRIPTION: Clear and remove a reference on an implicit return value. Used
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* to delete "stale" return values (if enabled, the return value
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* from every operator is saved at least momentarily, in case the
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* parent method exits.)
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*
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******************************************************************************/
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void
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acpi_ds_clear_implicit_return (
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struct acpi_walk_state *walk_state)
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{
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ACPI_FUNCTION_NAME ("ds_clear_implicit_return");
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/*
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* Slack must be enabled for this feature
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*/
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if (!acpi_gbl_enable_interpreter_slack) {
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return;
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}
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if (walk_state->implicit_return_obj) {
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/*
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* Delete any "stale" implicit return. However, in
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* complex statements, the implicit return value can be
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* bubbled up several levels.
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*/
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
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"Removing reference on stale implicit return obj %p\n",
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walk_state->implicit_return_obj));
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acpi_ut_remove_reference (walk_state->implicit_return_obj);
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walk_state->implicit_return_obj = NULL;
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}
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}
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#ifndef ACPI_NO_METHOD_EXECUTION
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_do_implicit_return
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*
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* PARAMETERS: return_desc - The return value
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* walk_state - Current State
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* add_reference - True if a reference should be added to the
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* return object
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*
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* RETURN: TRUE if implicit return enabled, FALSE otherwise
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*
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* DESCRIPTION: Implements the optional "implicit return". We save the result
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* of every ASL operator and control method invocation in case the
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* parent method exit. Before storing a new return value, we
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* delete the previous return value.
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*
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******************************************************************************/
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u8
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acpi_ds_do_implicit_return (
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union acpi_operand_object *return_desc,
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struct acpi_walk_state *walk_state,
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u8 add_reference)
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{
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ACPI_FUNCTION_NAME ("ds_do_implicit_return");
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/*
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* Slack must be enabled for this feature, and we must
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* have a valid return object
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*/
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if ((!acpi_gbl_enable_interpreter_slack) ||
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(!return_desc)) {
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return (FALSE);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
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"Result %p will be implicitly returned; Prev=%p\n",
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return_desc,
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walk_state->implicit_return_obj));
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/*
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* Delete any "stale" implicit return value first. However, in
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* complex statements, the implicit return value can be
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* bubbled up several levels, so we don't clear the value if it
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* is the same as the return_desc.
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*/
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if (walk_state->implicit_return_obj) {
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if (walk_state->implicit_return_obj == return_desc) {
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return (TRUE);
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}
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acpi_ds_clear_implicit_return (walk_state);
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}
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/* Save the implicit return value, add a reference if requested */
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walk_state->implicit_return_obj = return_desc;
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if (add_reference) {
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acpi_ut_add_reference (return_desc);
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}
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return (TRUE);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_is_result_used
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*
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* PARAMETERS: Op - Current Op
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* walk_state - Current State
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*
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* RETURN: TRUE if result is used, FALSE otherwise
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*
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* DESCRIPTION: Check if a result object will be used by the parent
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*
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******************************************************************************/
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u8
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acpi_ds_is_result_used (
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union acpi_parse_object *op,
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struct acpi_walk_state *walk_state)
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{
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const struct acpi_opcode_info *parent_info;
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ACPI_FUNCTION_TRACE_PTR ("ds_is_result_used", op);
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/* Must have both an Op and a Result Object */
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if (!op) {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null Op\n"));
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return_VALUE (TRUE);
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}
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/*
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* We know that this operator is not a
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* Return() operator (would not come here.) 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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acpi_ds_do_implicit_return (walk_state->result_obj, walk_state, TRUE);
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/*
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* Now determine if the parent will use the result
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*
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* If there is no parent, or the parent is a scope_op, we are executing
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* at the method level. An executing method typically has no parent,
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* since each method is parsed separately. A method invoked externally
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* via execute_control_method has a scope_op as the parent.
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*/
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if ((!op->common.parent) ||
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(op->common.parent->common.aml_opcode == AML_SCOPE_OP)) {
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/* No parent, the return value cannot possibly be used */
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "At Method level, result of [%s] not used\n",
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acpi_ps_get_opcode_name (op->common.aml_opcode)));
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return_VALUE (FALSE);
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}
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/* Get info on the parent. The root_op is AML_SCOPE */
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parent_info = acpi_ps_get_opcode_info (op->common.parent->common.aml_opcode);
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if (parent_info->class == AML_CLASS_UNKNOWN) {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown parent opcode. Op=%p\n", op));
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return_VALUE (FALSE);
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}
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/*
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* Decide what to do with the result based on the parent. If
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* the parent opcode will not use the result, delete the object.
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* Otherwise leave it as is, it will be deleted when it is used
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* as an operand later.
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*/
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switch (parent_info->class) {
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case AML_CLASS_CONTROL:
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switch (op->common.parent->common.aml_opcode) {
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case AML_RETURN_OP:
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/* Never delete the return value associated with a return opcode */
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goto result_used;
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case AML_IF_OP:
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case AML_WHILE_OP:
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/*
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* If we are executing the predicate AND this is the predicate op,
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* we will use the return value
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*/
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if ((walk_state->control_state->common.state == ACPI_CONTROL_PREDICATE_EXECUTING) &&
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(walk_state->control_state->control.predicate_op == op)) {
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goto result_used;
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}
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break;
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default:
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/* Ignore other control opcodes */
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break;
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}
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/* The general control opcode returns no result */
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goto result_not_used;
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case AML_CLASS_CREATE:
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/*
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* These opcodes allow term_arg(s) as operands and therefore
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* the operands can be method calls. The result is used.
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*/
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goto result_used;
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case AML_CLASS_NAMED_OBJECT:
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if ((op->common.parent->common.aml_opcode == AML_REGION_OP) ||
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(op->common.parent->common.aml_opcode == AML_DATA_REGION_OP) ||
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(op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
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(op->common.parent->common.aml_opcode == AML_VAR_PACKAGE_OP) ||
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(op->common.parent->common.aml_opcode == AML_BUFFER_OP) ||
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(op->common.parent->common.aml_opcode == AML_INT_EVAL_SUBTREE_OP)) {
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/*
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* These opcodes allow term_arg(s) as operands and therefore
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* the operands can be method calls. The result is used.
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*/
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goto result_used;
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}
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goto result_not_used;
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default:
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/*
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* In all other cases. the parent will actually use the return
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* object, so keep it.
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*/
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goto result_used;
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}
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result_used:
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Result of [%s] used by Parent [%s] Op=%p\n",
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acpi_ps_get_opcode_name (op->common.aml_opcode),
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acpi_ps_get_opcode_name (op->common.parent->common.aml_opcode), op));
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return_VALUE (TRUE);
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result_not_used:
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Result of [%s] not used by Parent [%s] Op=%p\n",
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acpi_ps_get_opcode_name (op->common.aml_opcode),
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acpi_ps_get_opcode_name (op->common.parent->common.aml_opcode), op));
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return_VALUE (FALSE);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_delete_result_if_not_used
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*
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* PARAMETERS: Op - Current parse Op
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* result_obj - Result of the operation
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* walk_state - Current state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Used after interpretation of an opcode. If there is an internal
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* result descriptor, check if the parent opcode will actually use
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* this result. If not, delete the result now so that it will
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* not become orphaned.
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*
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******************************************************************************/
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void
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acpi_ds_delete_result_if_not_used (
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union acpi_parse_object *op,
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union acpi_operand_object *result_obj,
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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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acpi_status status;
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ACPI_FUNCTION_TRACE_PTR ("ds_delete_result_if_not_used", result_obj);
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if (!op) {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null Op\n"));
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return_VOID;
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}
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if (!result_obj) {
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return_VOID;
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}
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if (!acpi_ds_is_result_used (op, walk_state)) {
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/* Must pop the result stack (obj_desc should be equal to result_obj) */
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status = acpi_ds_result_pop (&obj_desc, walk_state);
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if (ACPI_SUCCESS (status)) {
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acpi_ut_remove_reference (result_obj);
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}
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_resolve_operands
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*
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* PARAMETERS: walk_state - Current walk state with operands on stack
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*
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* RETURN: Status
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*
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* DESCRIPTION: Resolve all operands to their values. Used to prepare
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* arguments to a control method invocation (a call from one
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* method to another.)
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*
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******************************************************************************/
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acpi_status
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acpi_ds_resolve_operands (
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struct acpi_walk_state *walk_state)
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{
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u32 i;
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE_PTR ("ds_resolve_operands", walk_state);
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/*
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* Attempt to resolve each of the valid operands
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* Method arguments are passed by reference, not by value. This means
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* that the actual objects are passed, not copies of the objects.
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*/
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for (i = 0; i < walk_state->num_operands; i++) {
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status = acpi_ex_resolve_to_value (&walk_state->operands[i], walk_state);
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if (ACPI_FAILURE (status)) {
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break;
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}
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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_ds_clear_operands
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*
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* PARAMETERS: walk_state - Current walk state with operands on stack
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*
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* RETURN: None
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*
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* DESCRIPTION: Clear all operands on the current walk state operand stack.
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*
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******************************************************************************/
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void
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acpi_ds_clear_operands (
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struct acpi_walk_state *walk_state)
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{
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u32 i;
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ACPI_FUNCTION_TRACE_PTR ("ds_clear_operands", walk_state);
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/* Remove a reference on each operand on the stack */
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for (i = 0; i < walk_state->num_operands; i++) {
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/*
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* Remove a reference to all operands, including both
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* "Arguments" and "Targets".
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*/
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acpi_ut_remove_reference (walk_state->operands[i]);
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walk_state->operands[i] = NULL;
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}
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walk_state->num_operands = 0;
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return_VOID;
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}
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#endif
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_create_operand
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*
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* PARAMETERS: walk_state - Current walk state
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* Arg - Parse object for the argument
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* arg_index - Which argument (zero based)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Translate a parse tree object that is an argument to an AML
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* opcode to the equivalent interpreter object. This may include
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* looking up a name or entering a new name into the internal
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* namespace.
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*
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******************************************************************************/
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acpi_status
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acpi_ds_create_operand (
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struct acpi_walk_state *walk_state,
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union acpi_parse_object *arg,
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u32 arg_index)
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{
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acpi_status status = AE_OK;
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char *name_string;
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u32 name_length;
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union acpi_operand_object *obj_desc;
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union acpi_parse_object *parent_op;
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u16 opcode;
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acpi_interpreter_mode interpreter_mode;
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const struct acpi_opcode_info *op_info;
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|
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ACPI_FUNCTION_TRACE_PTR ("ds_create_operand", arg);
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|
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/* A valid name must be looked up in the namespace */
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if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) &&
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(arg->common.value.string)) {
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ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n", arg));
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/* Get the entire name string from the AML stream */
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status = acpi_ex_get_name_string (ACPI_TYPE_ANY, arg->common.value.buffer,
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&name_string, &name_length);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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/* All prefixes have been handled, and the name is in name_string */
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/*
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* Special handling for buffer_field declarations. This is a deferred
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* opcode that unfortunately defines the field name as the last
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* parameter instead of the first. We get here when we are performing
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* the deferred execution, so the actual name of the field is already
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* in the namespace. We don't want to attempt to look it up again
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* because we may be executing in a different scope than where the
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* actual opcode exists.
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*/
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if ((walk_state->deferred_node) &&
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(walk_state->deferred_node->type == ACPI_TYPE_BUFFER_FIELD) &&
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(arg_index != 0)) {
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obj_desc = ACPI_CAST_PTR (union acpi_operand_object, walk_state->deferred_node);
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status = AE_OK;
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}
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else /* All other opcodes */ {
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/*
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* Differentiate between a namespace "create" operation
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* versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
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* IMODE_EXECUTE) in order to support the creation of
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* namespace objects during the execution of control methods.
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*/
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parent_op = arg->common.parent;
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op_info = acpi_ps_get_opcode_info (parent_op->common.aml_opcode);
|
|
if ((op_info->flags & AML_NSNODE) &&
|
|
(parent_op->common.aml_opcode != AML_INT_METHODCALL_OP) &&
|
|
(parent_op->common.aml_opcode != AML_REGION_OP) &&
|
|
(parent_op->common.aml_opcode != AML_INT_NAMEPATH_OP)) {
|
|
/* Enter name into namespace if not found */
|
|
|
|
interpreter_mode = ACPI_IMODE_LOAD_PASS2;
|
|
}
|
|
else {
|
|
/* Return a failure if name not found */
|
|
|
|
interpreter_mode = ACPI_IMODE_EXECUTE;
|
|
}
|
|
|
|
status = acpi_ns_lookup (walk_state->scope_info, name_string,
|
|
ACPI_TYPE_ANY, interpreter_mode,
|
|
ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
|
|
walk_state,
|
|
ACPI_CAST_INDIRECT_PTR (struct acpi_namespace_node, &obj_desc));
|
|
/*
|
|
* The only case where we pass through (ignore) a NOT_FOUND
|
|
* error is for the cond_ref_of opcode.
|
|
*/
|
|
if (status == AE_NOT_FOUND) {
|
|
if (parent_op->common.aml_opcode == AML_COND_REF_OF_OP) {
|
|
/*
|
|
* For the Conditional Reference op, it's OK if
|
|
* the name is not found; We just need a way to
|
|
* indicate this to the interpreter, set the
|
|
* object to the root
|
|
*/
|
|
obj_desc = ACPI_CAST_PTR (union acpi_operand_object, acpi_gbl_root_node);
|
|
status = AE_OK;
|
|
}
|
|
else {
|
|
/*
|
|
* We just plain didn't find it -- which is a
|
|
* very serious error at this point
|
|
*/
|
|
status = AE_AML_NAME_NOT_FOUND;
|
|
}
|
|
}
|
|
|
|
if (ACPI_FAILURE (status)) {
|
|
ACPI_REPORT_NSERROR (name_string, status);
|
|
}
|
|
}
|
|
|
|
/* Free the namestring created above */
|
|
|
|
ACPI_MEM_FREE (name_string);
|
|
|
|
/* Check status from the lookup */
|
|
|
|
if (ACPI_FAILURE (status)) {
|
|
return_ACPI_STATUS (status);
|
|
}
|
|
|
|
/* Put the resulting object onto the current object stack */
|
|
|
|
status = acpi_ds_obj_stack_push (obj_desc, walk_state);
|
|
if (ACPI_FAILURE (status)) {
|
|
return_ACPI_STATUS (status);
|
|
}
|
|
ACPI_DEBUGGER_EXEC (acpi_db_display_argument_object (obj_desc, walk_state));
|
|
}
|
|
else {
|
|
/* Check for null name case */
|
|
|
|
if (arg->common.aml_opcode == AML_INT_NAMEPATH_OP) {
|
|
/*
|
|
* If the name is null, this means that this is an
|
|
* optional result parameter that was not specified
|
|
* in the original ASL. Create a Zero Constant for a
|
|
* placeholder. (Store to a constant is a Noop.)
|
|
*/
|
|
opcode = AML_ZERO_OP; /* Has no arguments! */
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Null namepath: Arg=%p\n", arg));
|
|
}
|
|
else {
|
|
opcode = arg->common.aml_opcode;
|
|
}
|
|
|
|
/* Get the object type of the argument */
|
|
|
|
op_info = acpi_ps_get_opcode_info (opcode);
|
|
if (op_info->object_type == ACPI_TYPE_INVALID) {
|
|
return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
|
|
}
|
|
|
|
if (op_info->flags & AML_HAS_RETVAL) {
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
|
|
"Argument previously created, already stacked \n"));
|
|
|
|
ACPI_DEBUGGER_EXEC (acpi_db_display_argument_object (
|
|
walk_state->operands [walk_state->num_operands - 1], walk_state));
|
|
|
|
/*
|
|
* Use value that was already previously returned
|
|
* by the evaluation of this argument
|
|
*/
|
|
status = acpi_ds_result_pop_from_bottom (&obj_desc, walk_state);
|
|
if (ACPI_FAILURE (status)) {
|
|
/*
|
|
* Only error is underflow, and this indicates
|
|
* a missing or null operand!
|
|
*/
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Missing or null operand, %s\n",
|
|
acpi_format_exception (status)));
|
|
return_ACPI_STATUS (status);
|
|
}
|
|
}
|
|
else {
|
|
/* Create an ACPI_INTERNAL_OBJECT for the argument */
|
|
|
|
obj_desc = acpi_ut_create_internal_object (op_info->object_type);
|
|
if (!obj_desc) {
|
|
return_ACPI_STATUS (AE_NO_MEMORY);
|
|
}
|
|
|
|
/* Initialize the new object */
|
|
|
|
status = acpi_ds_init_object_from_op (walk_state, arg,
|
|
opcode, &obj_desc);
|
|
if (ACPI_FAILURE (status)) {
|
|
acpi_ut_delete_object_desc (obj_desc);
|
|
return_ACPI_STATUS (status);
|
|
}
|
|
}
|
|
|
|
/* Put the operand object on the object stack */
|
|
|
|
status = acpi_ds_obj_stack_push (obj_desc, walk_state);
|
|
if (ACPI_FAILURE (status)) {
|
|
return_ACPI_STATUS (status);
|
|
}
|
|
|
|
ACPI_DEBUGGER_EXEC (acpi_db_display_argument_object (obj_desc, walk_state));
|
|
}
|
|
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ds_create_operands
|
|
*
|
|
* PARAMETERS: walk_state - Current state
|
|
* first_arg - First argument of a parser argument tree
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Convert an operator's arguments from a parse tree format to
|
|
* namespace objects and place those argument object on the object
|
|
* stack in preparation for evaluation by the interpreter.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_ds_create_operands (
|
|
struct acpi_walk_state *walk_state,
|
|
union acpi_parse_object *first_arg)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
union acpi_parse_object *arg;
|
|
u32 arg_count = 0;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE_PTR ("ds_create_operands", first_arg);
|
|
|
|
|
|
/* For all arguments in the list... */
|
|
|
|
arg = first_arg;
|
|
while (arg) {
|
|
status = acpi_ds_create_operand (walk_state, arg, arg_count);
|
|
if (ACPI_FAILURE (status)) {
|
|
goto cleanup;
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Arg #%d (%p) done, Arg1=%p\n",
|
|
arg_count, arg, first_arg));
|
|
|
|
/* Move on to next argument, if any */
|
|
|
|
arg = arg->common.next;
|
|
arg_count++;
|
|
}
|
|
|
|
return_ACPI_STATUS (status);
|
|
|
|
|
|
cleanup:
|
|
/*
|
|
* We must undo everything done above; meaning that we must
|
|
* pop everything off of the operand stack and delete those
|
|
* objects
|
|
*/
|
|
(void) acpi_ds_obj_stack_pop_and_delete (arg_count, walk_state);
|
|
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "While creating Arg %d - %s\n",
|
|
(arg_count + 1), acpi_format_exception (status)));
|
|
return_ACPI_STATUS (status);
|
|
}
|
|
|
|
|