692 lines
19 KiB
C
692 lines
19 KiB
C
/******************************************************************************
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*
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* Module Name: psparse - Parser top level AML parse routines
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2008, Intel Corp.
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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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/*
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* Parse the AML and build an operation tree as most interpreters,
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* like Perl, do. Parsing is done by hand rather than with a YACC
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* generated parser to tightly constrain stack and dynamic memory
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* usage. At the same time, parsing is kept flexible and the code
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* fairly compact by parsing based on a list of AML opcode
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* templates in aml_op_info[]
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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/acdispat.h>
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#include <acpi/amlcode.h>
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#include <acpi/acnamesp.h>
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#include <acpi/acinterp.h>
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#define _COMPONENT ACPI_PARSER
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ACPI_MODULE_NAME("psparse")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_get_opcode_size
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*
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* PARAMETERS: Opcode - An AML opcode
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*
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* RETURN: Size of the opcode, in bytes (1 or 2)
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*
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* DESCRIPTION: Get the size of the current opcode.
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*
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******************************************************************************/
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u32 acpi_ps_get_opcode_size(u32 opcode)
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{
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/* Extended (2-byte) opcode if > 255 */
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if (opcode > 0x00FF) {
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return (2);
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}
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/* Otherwise, just a single byte opcode */
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return (1);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_peek_opcode
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*
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* PARAMETERS: parser_state - A parser state object
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*
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* RETURN: Next AML opcode
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*
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* DESCRIPTION: Get next AML opcode (without incrementing AML pointer)
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*
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******************************************************************************/
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u16 acpi_ps_peek_opcode(struct acpi_parse_state * parser_state)
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{
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u8 *aml;
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u16 opcode;
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aml = parser_state->aml;
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opcode = (u16) ACPI_GET8(aml);
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if (opcode == AML_EXTENDED_OP_PREFIX) {
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/* Extended opcode, get the second opcode byte */
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aml++;
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opcode = (u16) ((opcode << 8) | ACPI_GET8(aml));
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}
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return (opcode);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_complete_this_op
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*
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* PARAMETERS: walk_state - Current State
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* Op - Op to complete
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*
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* RETURN: Status
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*
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* DESCRIPTION: Perform any cleanup at the completion of an Op.
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*
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******************************************************************************/
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acpi_status
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acpi_ps_complete_this_op(struct acpi_walk_state * walk_state,
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union acpi_parse_object * op)
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{
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union acpi_parse_object *prev;
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union acpi_parse_object *next;
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const struct acpi_opcode_info *parent_info;
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union acpi_parse_object *replacement_op = NULL;
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ACPI_FUNCTION_TRACE_PTR(ps_complete_this_op, op);
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/* Check for null Op, can happen if AML code is corrupt */
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if (!op) {
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return_ACPI_STATUS(AE_OK); /* OK for now */
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}
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/* Delete this op and the subtree below it if asked to */
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if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) !=
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ACPI_PARSE_DELETE_TREE)
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|| (walk_state->op_info->class == AML_CLASS_ARGUMENT)) {
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return_ACPI_STATUS(AE_OK);
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}
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/* Make sure that we only delete this subtree */
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if (op->common.parent) {
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prev = op->common.parent->common.value.arg;
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if (!prev) {
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/* Nothing more to do */
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goto cleanup;
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}
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/*
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* Check if we need to replace the operator and its subtree
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* with a return value op (placeholder op)
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*/
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parent_info =
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acpi_ps_get_opcode_info(op->common.parent->common.
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aml_opcode);
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switch (parent_info->class) {
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case AML_CLASS_CONTROL:
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break;
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case AML_CLASS_CREATE:
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/*
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* These opcodes contain term_arg operands. The current
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* op must be replaced by a placeholder return op
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*/
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replacement_op =
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acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP);
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if (!replacement_op) {
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goto allocate_error;
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}
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break;
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case AML_CLASS_NAMED_OBJECT:
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/*
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* These opcodes contain term_arg operands. The current
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* op must be replaced by a placeholder return op
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*/
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if ((op->common.parent->common.aml_opcode ==
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AML_REGION_OP)
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|| (op->common.parent->common.aml_opcode ==
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AML_DATA_REGION_OP)
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|| (op->common.parent->common.aml_opcode ==
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AML_BUFFER_OP)
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|| (op->common.parent->common.aml_opcode ==
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AML_PACKAGE_OP)
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|| (op->common.parent->common.aml_opcode ==
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AML_BANK_FIELD_OP)
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|| (op->common.parent->common.aml_opcode ==
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AML_VAR_PACKAGE_OP)) {
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replacement_op =
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acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP);
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if (!replacement_op) {
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goto allocate_error;
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}
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} else
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if ((op->common.parent->common.aml_opcode ==
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AML_NAME_OP)
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&& (walk_state->pass_number <=
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ACPI_IMODE_LOAD_PASS2)) {
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if ((op->common.aml_opcode == AML_BUFFER_OP)
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|| (op->common.aml_opcode == AML_PACKAGE_OP)
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|| (op->common.aml_opcode ==
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AML_VAR_PACKAGE_OP)) {
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replacement_op =
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acpi_ps_alloc_op(op->common.
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aml_opcode);
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if (!replacement_op) {
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goto allocate_error;
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}
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replacement_op->named.data =
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op->named.data;
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replacement_op->named.length =
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op->named.length;
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}
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}
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break;
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default:
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replacement_op =
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acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP);
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if (!replacement_op) {
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goto allocate_error;
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}
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}
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/* We must unlink this op from the parent tree */
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if (prev == op) {
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/* This op is the first in the list */
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if (replacement_op) {
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replacement_op->common.parent =
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op->common.parent;
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replacement_op->common.value.arg = NULL;
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replacement_op->common.node = op->common.node;
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op->common.parent->common.value.arg =
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replacement_op;
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replacement_op->common.next = op->common.next;
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} else {
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op->common.parent->common.value.arg =
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op->common.next;
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}
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}
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/* Search the parent list */
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else
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while (prev) {
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/* Traverse all siblings in the parent's argument list */
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next = prev->common.next;
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if (next == op) {
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if (replacement_op) {
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replacement_op->common.parent =
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op->common.parent;
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replacement_op->common.value.
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arg = NULL;
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replacement_op->common.node =
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op->common.node;
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prev->common.next =
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replacement_op;
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replacement_op->common.next =
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op->common.next;
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next = NULL;
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} else {
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prev->common.next =
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op->common.next;
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next = NULL;
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}
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}
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prev = next;
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}
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}
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cleanup:
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/* Now we can actually delete the subtree rooted at Op */
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acpi_ps_delete_parse_tree(op);
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return_ACPI_STATUS(AE_OK);
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allocate_error:
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/* Always delete the subtree, even on error */
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acpi_ps_delete_parse_tree(op);
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_next_parse_state
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*
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* PARAMETERS: walk_state - Current state
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* Op - Current parse op
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* callback_status - Status from previous operation
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*
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* RETURN: Status
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*
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* DESCRIPTION: Update the parser state based upon the return exception from
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* the parser callback.
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*
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******************************************************************************/
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acpi_status
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acpi_ps_next_parse_state(struct acpi_walk_state *walk_state,
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union acpi_parse_object *op,
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acpi_status callback_status)
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{
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struct acpi_parse_state *parser_state = &walk_state->parser_state;
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acpi_status status = AE_CTRL_PENDING;
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ACPI_FUNCTION_TRACE_PTR(ps_next_parse_state, op);
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switch (callback_status) {
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case AE_CTRL_TERMINATE:
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/*
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* A control method was terminated via a RETURN statement.
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* The walk of this method is complete.
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*/
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parser_state->aml = parser_state->aml_end;
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status = AE_CTRL_TERMINATE;
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break;
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case AE_CTRL_BREAK:
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parser_state->aml = walk_state->aml_last_while;
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walk_state->control_state->common.value = FALSE;
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status = AE_CTRL_BREAK;
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break;
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case AE_CTRL_CONTINUE:
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parser_state->aml = walk_state->aml_last_while;
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status = AE_CTRL_CONTINUE;
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break;
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case AE_CTRL_PENDING:
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parser_state->aml = walk_state->aml_last_while;
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break;
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#if 0
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case AE_CTRL_SKIP:
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parser_state->aml = parser_state->scope->parse_scope.pkg_end;
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status = AE_OK;
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break;
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#endif
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case AE_CTRL_TRUE:
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/*
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* Predicate of an IF was true, and we are at the matching ELSE.
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* Just close out this package
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*/
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parser_state->aml = acpi_ps_get_next_package_end(parser_state);
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status = AE_CTRL_PENDING;
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break;
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case AE_CTRL_FALSE:
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/*
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* Either an IF/WHILE Predicate was false or we encountered a BREAK
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* opcode. In both cases, we do not execute the rest of the
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* package; We simply close out the parent (finishing the walk of
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* this branch of the tree) and continue execution at the parent
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* level.
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*/
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parser_state->aml = parser_state->scope->parse_scope.pkg_end;
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/* In the case of a BREAK, just force a predicate (if any) to FALSE */
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walk_state->control_state->common.value = FALSE;
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status = AE_CTRL_END;
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break;
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case AE_CTRL_TRANSFER:
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/* A method call (invocation) -- transfer control */
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status = AE_CTRL_TRANSFER;
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walk_state->prev_op = op;
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walk_state->method_call_op = op;
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walk_state->method_call_node =
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(op->common.value.arg)->common.node;
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/* Will return value (if any) be used by the caller? */
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walk_state->return_used =
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acpi_ds_is_result_used(op, walk_state);
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break;
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default:
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status = callback_status;
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if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) {
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status = AE_OK;
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}
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break;
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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_ps_parse_aml
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*
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* PARAMETERS: walk_state - Current state
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*
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*
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* RETURN: Status
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*
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* DESCRIPTION: Parse raw AML and return a tree of ops
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*
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******************************************************************************/
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acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state)
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{
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acpi_status status;
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struct acpi_thread_state *thread;
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struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list;
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struct acpi_walk_state *previous_walk_state;
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ACPI_FUNCTION_TRACE(ps_parse_aml);
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
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"Entered with WalkState=%p Aml=%p size=%X\n",
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walk_state, walk_state->parser_state.aml,
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walk_state->parser_state.aml_size));
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/* Create and initialize a new thread state */
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thread = acpi_ut_create_thread_state();
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if (!thread) {
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acpi_ds_delete_walk_state(walk_state);
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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walk_state->thread = thread;
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/*
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* If executing a method, the starting sync_level is this method's
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* sync_level
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*/
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if (walk_state->method_desc) {
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walk_state->thread->current_sync_level =
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walk_state->method_desc->method.sync_level;
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}
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acpi_ds_push_walk_state(walk_state, thread);
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/*
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* This global allows the AML debugger to get a handle to the currently
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* executing control method.
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*/
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acpi_gbl_current_walk_list = thread;
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/*
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* Execute the walk loop as long as there is a valid Walk State. This
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* handles nested control method invocations without recursion.
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "State=%p\n", walk_state));
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status = AE_OK;
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while (walk_state) {
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if (ACPI_SUCCESS(status)) {
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/*
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* The parse_loop executes AML until the method terminates
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* or calls another method.
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*/
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status = acpi_ps_parse_loop(walk_state);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
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"Completed one call to walk loop, %s State=%p\n",
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acpi_format_exception(status), walk_state));
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if (status == AE_CTRL_TRANSFER) {
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/*
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* A method call was detected.
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* Transfer control to the called control method
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*/
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status =
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acpi_ds_call_control_method(thread, walk_state,
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NULL);
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if (ACPI_FAILURE(status)) {
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status =
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acpi_ds_method_error(status, walk_state);
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}
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/*
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* If the transfer to the new method method call worked, a new walk
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* state was created -- get it
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*/
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walk_state = acpi_ds_get_current_walk_state(thread);
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continue;
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} else if (status == AE_CTRL_TERMINATE) {
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status = AE_OK;
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} else if ((status != AE_OK) && (walk_state->method_desc)) {
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/* Either the method parse or actual execution failed */
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ACPI_ERROR_METHOD("Method parse/execution failed",
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walk_state->method_node, NULL,
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status);
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/* Check for possible multi-thread reentrancy problem */
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if ((status == AE_ALREADY_EXISTS) &&
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(!walk_state->method_desc->method.mutex)) {
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ACPI_INFO((AE_INFO,
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"Marking method %4.4s as Serialized because of AE_ALREADY_EXISTS error",
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walk_state->method_node->name.
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ascii));
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/*
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* Method tried to create an object twice. The probable cause is
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* that the method cannot handle reentrancy.
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*
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* The method is marked not_serialized, but it tried to create
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* a named object, causing the second thread entrance to fail.
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* Workaround this problem by marking the method permanently
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* as Serialized.
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*/
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walk_state->method_desc->method.method_flags |=
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AML_METHOD_SERIALIZED;
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walk_state->method_desc->method.sync_level = 0;
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}
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}
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/* We are done with this walk, move on to the parent if any */
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walk_state = acpi_ds_pop_walk_state(thread);
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|
|
/* Reset the current scope to the beginning of scope stack */
|
|
|
|
acpi_ds_scope_stack_clear(walk_state);
|
|
|
|
/*
|
|
* If we just returned from the execution of a control method or if we
|
|
* encountered an error during the method parse phase, there's lots of
|
|
* cleanup to do
|
|
*/
|
|
if (((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
|
|
ACPI_PARSE_EXECUTE) || (ACPI_FAILURE(status))) {
|
|
acpi_ds_terminate_control_method(walk_state->
|
|
method_desc,
|
|
walk_state);
|
|
}
|
|
|
|
/* Delete this walk state and all linked control states */
|
|
|
|
acpi_ps_cleanup_scope(&walk_state->parser_state);
|
|
previous_walk_state = walk_state;
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
|
|
"ReturnValue=%p, ImplicitValue=%p State=%p\n",
|
|
walk_state->return_desc,
|
|
walk_state->implicit_return_obj, walk_state));
|
|
|
|
/* Check if we have restarted a preempted walk */
|
|
|
|
walk_state = acpi_ds_get_current_walk_state(thread);
|
|
if (walk_state) {
|
|
if (ACPI_SUCCESS(status)) {
|
|
/*
|
|
* There is another walk state, restart it.
|
|
* If the method return value is not used by the parent,
|
|
* The object is deleted
|
|
*/
|
|
if (!previous_walk_state->return_desc) {
|
|
/*
|
|
* In slack mode execution, if there is no return value
|
|
* we should implicitly return zero (0) as a default value.
|
|
*/
|
|
if (acpi_gbl_enable_interpreter_slack &&
|
|
!previous_walk_state->
|
|
implicit_return_obj) {
|
|
previous_walk_state->
|
|
implicit_return_obj =
|
|
acpi_ut_create_internal_object
|
|
(ACPI_TYPE_INTEGER);
|
|
if (!previous_walk_state->
|
|
implicit_return_obj) {
|
|
return_ACPI_STATUS
|
|
(AE_NO_MEMORY);
|
|
}
|
|
|
|
previous_walk_state->
|
|
implicit_return_obj->
|
|
integer.value = 0;
|
|
}
|
|
|
|
/* Restart the calling control method */
|
|
|
|
status =
|
|
acpi_ds_restart_control_method
|
|
(walk_state,
|
|
previous_walk_state->
|
|
implicit_return_obj);
|
|
} else {
|
|
/*
|
|
* We have a valid return value, delete any implicit
|
|
* return value.
|
|
*/
|
|
acpi_ds_clear_implicit_return
|
|
(previous_walk_state);
|
|
|
|
status =
|
|
acpi_ds_restart_control_method
|
|
(walk_state,
|
|
previous_walk_state->return_desc);
|
|
}
|
|
if (ACPI_SUCCESS(status)) {
|
|
walk_state->walk_type |=
|
|
ACPI_WALK_METHOD_RESTART;
|
|
}
|
|
} else {
|
|
/* On error, delete any return object */
|
|
|
|
acpi_ut_remove_reference(previous_walk_state->
|
|
return_desc);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Just completed a 1st-level method, save the final internal return
|
|
* value (if any)
|
|
*/
|
|
else if (previous_walk_state->caller_return_desc) {
|
|
if (previous_walk_state->implicit_return_obj) {
|
|
*(previous_walk_state->caller_return_desc) =
|
|
previous_walk_state->implicit_return_obj;
|
|
} else {
|
|
/* NULL if no return value */
|
|
|
|
*(previous_walk_state->caller_return_desc) =
|
|
previous_walk_state->return_desc;
|
|
}
|
|
} else {
|
|
if (previous_walk_state->return_desc) {
|
|
|
|
/* Caller doesn't want it, must delete it */
|
|
|
|
acpi_ut_remove_reference(previous_walk_state->
|
|
return_desc);
|
|
}
|
|
if (previous_walk_state->implicit_return_obj) {
|
|
|
|
/* Caller doesn't want it, must delete it */
|
|
|
|
acpi_ut_remove_reference(previous_walk_state->
|
|
implicit_return_obj);
|
|
}
|
|
}
|
|
|
|
acpi_ds_delete_walk_state(previous_walk_state);
|
|
}
|
|
|
|
/* Normal exit */
|
|
|
|
acpi_ex_release_all_mutexes(thread);
|
|
acpi_ut_delete_generic_state(ACPI_CAST_PTR
|
|
(union acpi_generic_state, thread));
|
|
acpi_gbl_current_walk_list = prev_walk_list;
|
|
return_ACPI_STATUS(status);
|
|
}
|