632 lines
20 KiB
C
632 lines
20 KiB
C
/******************************************************************************
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*
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* Module Name: psloop - Main AML parse loop
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2013, 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, (such as
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* Perl) do. Parsing is done by hand rather than with a YACC generated parser
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* to tightly constrain stack and dynamic memory usage. Parsing is kept
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* flexible and the code fairly compact by parsing based on a list of AML
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* opcode templates in AmlOpInfo[].
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*/
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#include <contrib/dev/acpica/include/acpi.h>
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#include <contrib/dev/acpica/include/accommon.h>
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#include <contrib/dev/acpica/include/acparser.h>
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#include <contrib/dev/acpica/include/acdispat.h>
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#include <contrib/dev/acpica/include/amlcode.h>
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#define _COMPONENT ACPI_PARSER
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ACPI_MODULE_NAME ("psloop")
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/* Local prototypes */
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static ACPI_STATUS
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AcpiPsGetArguments (
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ACPI_WALK_STATE *WalkState,
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UINT8 *AmlOpStart,
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ACPI_PARSE_OBJECT *Op);
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static void
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AcpiPsLinkModuleCode (
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ACPI_PARSE_OBJECT *ParentOp,
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UINT8 *AmlStart,
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UINT32 AmlLength,
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ACPI_OWNER_ID OwnerId);
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/*******************************************************************************
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*
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* FUNCTION: AcpiPsGetArguments
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*
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* PARAMETERS: WalkState - Current state
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* AmlOpStart - Op start in AML
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* Op - Current Op
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*
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* RETURN: Status
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*
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* DESCRIPTION: Get arguments for passed Op.
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiPsGetArguments (
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ACPI_WALK_STATE *WalkState,
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UINT8 *AmlOpStart,
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ACPI_PARSE_OBJECT *Op)
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{
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ACPI_STATUS Status = AE_OK;
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ACPI_PARSE_OBJECT *Arg = NULL;
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const ACPI_OPCODE_INFO *OpInfo;
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ACPI_FUNCTION_TRACE_PTR (PsGetArguments, WalkState);
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switch (Op->Common.AmlOpcode)
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{
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case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
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case AML_WORD_OP: /* AML_WORDDATA_ARG */
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case AML_DWORD_OP: /* AML_DWORDATA_ARG */
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case AML_QWORD_OP: /* AML_QWORDATA_ARG */
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case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
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/* Fill in constant or string argument directly */
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AcpiPsGetNextSimpleArg (&(WalkState->ParserState),
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GET_CURRENT_ARG_TYPE (WalkState->ArgTypes), Op);
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break;
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case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
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Status = AcpiPsGetNextNamepath (WalkState, &(WalkState->ParserState), Op, 1);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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WalkState->ArgTypes = 0;
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break;
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default:
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/*
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* Op is not a constant or string, append each argument to the Op
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*/
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while (GET_CURRENT_ARG_TYPE (WalkState->ArgTypes) && !WalkState->ArgCount)
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{
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WalkState->AmlOffset = (UINT32) ACPI_PTR_DIFF (WalkState->ParserState.Aml,
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WalkState->ParserState.AmlStart);
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Status = AcpiPsGetNextArg (WalkState, &(WalkState->ParserState),
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GET_CURRENT_ARG_TYPE (WalkState->ArgTypes), &Arg);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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if (Arg)
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{
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Arg->Common.AmlOffset = WalkState->AmlOffset;
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AcpiPsAppendArg (Op, Arg);
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}
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INCREMENT_ARG_LIST (WalkState->ArgTypes);
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}
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/*
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* Handle executable code at "module-level". This refers to
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* executable opcodes that appear outside of any control method.
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*/
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if ((WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2) &&
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((WalkState->ParseFlags & ACPI_PARSE_DISASSEMBLE) == 0))
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{
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/*
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* We want to skip If/Else/While constructs during Pass1 because we
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* want to actually conditionally execute the code during Pass2.
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*
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* Except for disassembly, where we always want to walk the
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* If/Else/While packages
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*/
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switch (Op->Common.AmlOpcode)
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{
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case AML_IF_OP:
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case AML_ELSE_OP:
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case AML_WHILE_OP:
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/*
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* Currently supported module-level opcodes are:
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* IF/ELSE/WHILE. These appear to be the most common,
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* and easiest to support since they open an AML
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* package.
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*/
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if (WalkState->PassNumber == ACPI_IMODE_LOAD_PASS1)
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{
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AcpiPsLinkModuleCode (Op->Common.Parent, AmlOpStart,
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(UINT32) (WalkState->ParserState.PkgEnd - AmlOpStart),
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WalkState->OwnerId);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
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"Pass1: Skipping an If/Else/While body\n"));
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/* Skip body of if/else/while in pass 1 */
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WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd;
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WalkState->ArgCount = 0;
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break;
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default:
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/*
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* Check for an unsupported executable opcode at module
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* level. We must be in PASS1, the parent must be a SCOPE,
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* The opcode class must be EXECUTE, and the opcode must
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* not be an argument to another opcode.
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*/
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if ((WalkState->PassNumber == ACPI_IMODE_LOAD_PASS1) &&
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(Op->Common.Parent->Common.AmlOpcode == AML_SCOPE_OP))
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{
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OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
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if ((OpInfo->Class == AML_CLASS_EXECUTE) &&
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(!Arg))
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{
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ACPI_WARNING ((AE_INFO,
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"Unsupported module-level executable opcode "
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"0x%.2X at table offset 0x%.4X",
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Op->Common.AmlOpcode,
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(UINT32) (ACPI_PTR_DIFF (AmlOpStart,
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WalkState->ParserState.AmlStart) +
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sizeof (ACPI_TABLE_HEADER))));
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}
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}
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break;
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}
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}
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/* Special processing for certain opcodes */
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switch (Op->Common.AmlOpcode)
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{
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case AML_METHOD_OP:
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/*
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* Skip parsing of control method because we don't have enough
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* info in the first pass to parse it correctly.
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*
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* Save the length and address of the body
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*/
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Op->Named.Data = WalkState->ParserState.Aml;
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Op->Named.Length = (UINT32)
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(WalkState->ParserState.PkgEnd - WalkState->ParserState.Aml);
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/* Skip body of method */
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WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd;
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WalkState->ArgCount = 0;
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break;
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case AML_BUFFER_OP:
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case AML_PACKAGE_OP:
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case AML_VAR_PACKAGE_OP:
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if ((Op->Common.Parent) &&
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(Op->Common.Parent->Common.AmlOpcode == AML_NAME_OP) &&
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(WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2))
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{
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/*
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* Skip parsing of Buffers and Packages because we don't have
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* enough info in the first pass to parse them correctly.
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*/
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Op->Named.Data = AmlOpStart;
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Op->Named.Length = (UINT32)
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(WalkState->ParserState.PkgEnd - AmlOpStart);
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/* Skip body */
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WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd;
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WalkState->ArgCount = 0;
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}
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break;
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case AML_WHILE_OP:
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if (WalkState->ControlState)
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{
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WalkState->ControlState->Control.PackageEnd =
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WalkState->ParserState.PkgEnd;
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}
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break;
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default:
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/* No action for all other opcodes */
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break;
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}
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break;
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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: AcpiPsLinkModuleCode
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*
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* PARAMETERS: ParentOp - Parent parser op
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* AmlStart - Pointer to the AML
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* AmlLength - Length of executable AML
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* OwnerId - OwnerId of module level code
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*
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* RETURN: None.
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*
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* DESCRIPTION: Wrap the module-level code with a method object and link the
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* object to the global list. Note, the mutex field of the method
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* object is used to link multiple module-level code objects.
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*
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******************************************************************************/
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static void
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AcpiPsLinkModuleCode (
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ACPI_PARSE_OBJECT *ParentOp,
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UINT8 *AmlStart,
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UINT32 AmlLength,
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ACPI_OWNER_ID OwnerId)
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{
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ACPI_OPERAND_OBJECT *Prev;
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ACPI_OPERAND_OBJECT *Next;
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ACPI_OPERAND_OBJECT *MethodObj;
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ACPI_NAMESPACE_NODE *ParentNode;
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/* Get the tail of the list */
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Prev = Next = AcpiGbl_ModuleCodeList;
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while (Next)
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{
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Prev = Next;
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Next = Next->Method.Mutex;
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}
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/*
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* Insert the module level code into the list. Merge it if it is
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* adjacent to the previous element.
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*/
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if (!Prev ||
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((Prev->Method.AmlStart + Prev->Method.AmlLength) != AmlStart))
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{
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/* Create, initialize, and link a new temporary method object */
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MethodObj = AcpiUtCreateInternalObject (ACPI_TYPE_METHOD);
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if (!MethodObj)
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{
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return;
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}
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if (ParentOp->Common.Node)
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{
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ParentNode = ParentOp->Common.Node;
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}
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else
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{
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ParentNode = AcpiGbl_RootNode;
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}
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MethodObj->Method.AmlStart = AmlStart;
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MethodObj->Method.AmlLength = AmlLength;
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MethodObj->Method.OwnerId = OwnerId;
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MethodObj->Method.InfoFlags |= ACPI_METHOD_MODULE_LEVEL;
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/*
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* Save the parent node in NextObject. This is cheating, but we
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* don't want to expand the method object.
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*/
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MethodObj->Method.NextObject =
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ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, ParentNode);
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if (!Prev)
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{
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AcpiGbl_ModuleCodeList = MethodObj;
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}
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else
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{
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Prev->Method.Mutex = MethodObj;
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}
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}
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else
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{
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Prev->Method.AmlLength += AmlLength;
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiPsParseLoop
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*
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* PARAMETERS: WalkState - Current state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Parse AML (pointed to by the current parser state) and return
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* a tree of ops.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiPsParseLoop (
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ACPI_WALK_STATE *WalkState)
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{
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ACPI_STATUS Status = AE_OK;
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ACPI_PARSE_OBJECT *Op = NULL; /* current op */
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ACPI_PARSE_STATE *ParserState;
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UINT8 *AmlOpStart = NULL;
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ACPI_FUNCTION_TRACE_PTR (PsParseLoop, WalkState);
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if (WalkState->DescendingCallback == NULL)
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{
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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ParserState = &WalkState->ParserState;
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WalkState->ArgTypes = 0;
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#if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
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if (WalkState->WalkType & ACPI_WALK_METHOD_RESTART)
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{
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/* We are restarting a preempted control method */
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if (AcpiPsHasCompletedScope (ParserState))
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{
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/*
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* We must check if a predicate to an IF or WHILE statement
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* was just completed
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*/
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if ((ParserState->Scope->ParseScope.Op) &&
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((ParserState->Scope->ParseScope.Op->Common.AmlOpcode == AML_IF_OP) ||
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(ParserState->Scope->ParseScope.Op->Common.AmlOpcode == AML_WHILE_OP)) &&
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(WalkState->ControlState) &&
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(WalkState->ControlState->Common.State ==
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ACPI_CONTROL_PREDICATE_EXECUTING))
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{
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/*
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* A predicate was just completed, get the value of the
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* predicate and branch based on that value
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*/
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WalkState->Op = NULL;
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Status = AcpiDsGetPredicateValue (WalkState, ACPI_TO_POINTER (TRUE));
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if (ACPI_FAILURE (Status) &&
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((Status & AE_CODE_MASK) != AE_CODE_CONTROL))
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{
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if (Status == AE_AML_NO_RETURN_VALUE)
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{
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ACPI_EXCEPTION ((AE_INFO, Status,
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"Invoked method did not return a value"));
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}
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ACPI_EXCEPTION ((AE_INFO, Status, "GetPredicate Failed"));
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return_ACPI_STATUS (Status);
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}
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Status = AcpiPsNextParseState (WalkState, Op, Status);
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}
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AcpiPsPopScope (ParserState, &Op,
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&WalkState->ArgTypes, &WalkState->ArgCount);
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ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", Op));
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}
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else if (WalkState->PrevOp)
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{
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/* We were in the middle of an op */
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Op = WalkState->PrevOp;
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WalkState->ArgTypes = WalkState->PrevArgTypes;
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}
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}
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#endif
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/* Iterative parsing loop, while there is more AML to process: */
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while ((ParserState->Aml < ParserState->AmlEnd) || (Op))
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{
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AmlOpStart = ParserState->Aml;
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if (!Op)
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{
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Status = AcpiPsCreateOp (WalkState, AmlOpStart, &Op);
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if (ACPI_FAILURE (Status))
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{
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if (Status == AE_CTRL_PARSE_CONTINUE)
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{
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continue;
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}
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if (Status == AE_CTRL_PARSE_PENDING)
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{
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Status = AE_OK;
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}
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Status = AcpiPsCompleteOp (WalkState, &Op, Status);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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continue;
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}
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Op->Common.AmlOffset = WalkState->AmlOffset;
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if (WalkState->OpInfo)
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{
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ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
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"Opcode %4.4X [%s] Op %p Aml %p AmlOffset %5.5X\n",
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(UINT32) Op->Common.AmlOpcode, WalkState->OpInfo->Name,
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Op, ParserState->Aml, Op->Common.AmlOffset));
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}
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}
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/*
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* Start ArgCount at zero because we don't know if there are
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* any args yet
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*/
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WalkState->ArgCount = 0;
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/* Are there any arguments that must be processed? */
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if (WalkState->ArgTypes)
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{
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/* Get arguments */
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Status = AcpiPsGetArguments (WalkState, AmlOpStart, Op);
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if (ACPI_FAILURE (Status))
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{
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Status = AcpiPsCompleteOp (WalkState, &Op, Status);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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continue;
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}
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}
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/* Check for arguments that need to be processed */
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if (WalkState->ArgCount)
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{
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/*
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* There are arguments (complex ones), push Op and
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* prepare for argument
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*/
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Status = AcpiPsPushScope (ParserState, Op,
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WalkState->ArgTypes, WalkState->ArgCount);
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if (ACPI_FAILURE (Status))
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{
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Status = AcpiPsCompleteOp (WalkState, &Op, Status);
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if (ACPI_FAILURE (Status))
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{
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return_ACPI_STATUS (Status);
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}
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continue;
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}
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Op = NULL;
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continue;
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}
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/*
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|
* All arguments have been processed -- Op is complete,
|
|
* prepare for next
|
|
*/
|
|
WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
|
|
if (WalkState->OpInfo->Flags & AML_NAMED)
|
|
{
|
|
if (Op->Common.AmlOpcode == AML_REGION_OP ||
|
|
Op->Common.AmlOpcode == AML_DATA_REGION_OP)
|
|
{
|
|
/*
|
|
* Skip parsing of control method or opregion body,
|
|
* because we don't have enough info in the first pass
|
|
* to parse them correctly.
|
|
*
|
|
* Completed parsing an OpRegion declaration, we now
|
|
* know the length.
|
|
*/
|
|
Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data);
|
|
}
|
|
}
|
|
|
|
if (WalkState->OpInfo->Flags & AML_CREATE)
|
|
{
|
|
/*
|
|
* Backup to beginning of CreateXXXfield declaration (1 for
|
|
* Opcode)
|
|
*
|
|
* BodyLength is unknown until we parse the body
|
|
*/
|
|
Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data);
|
|
}
|
|
|
|
if (Op->Common.AmlOpcode == AML_BANK_FIELD_OP)
|
|
{
|
|
/*
|
|
* Backup to beginning of BankField declaration
|
|
*
|
|
* BodyLength is unknown until we parse the body
|
|
*/
|
|
Op->Named.Length = (UINT32) (ParserState->Aml - Op->Named.Data);
|
|
}
|
|
|
|
/* This op complete, notify the dispatcher */
|
|
|
|
if (WalkState->AscendingCallback != NULL)
|
|
{
|
|
WalkState->Op = Op;
|
|
WalkState->Opcode = Op->Common.AmlOpcode;
|
|
|
|
Status = WalkState->AscendingCallback (WalkState);
|
|
Status = AcpiPsNextParseState (WalkState, Op, Status);
|
|
if (Status == AE_CTRL_PENDING)
|
|
{
|
|
Status = AE_OK;
|
|
}
|
|
}
|
|
|
|
Status = AcpiPsCompleteOp (WalkState, &Op, Status);
|
|
if (ACPI_FAILURE (Status))
|
|
{
|
|
return_ACPI_STATUS (Status);
|
|
}
|
|
|
|
} /* while ParserState->Aml */
|
|
|
|
Status = AcpiPsCompleteFinalOp (WalkState, Op, Status);
|
|
return_ACPI_STATUS (Status);
|
|
}
|