456 lines
12 KiB
C
456 lines
12 KiB
C
/******************************************************************************
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*
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* Module Name: asllength - Tree walk to determine package and opcode lengths
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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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#include "aslcompiler.h"
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#include "aslcompiler.y.h"
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#include "amlcode.h"
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#define _COMPONENT ACPI_COMPILER
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ACPI_MODULE_NAME ("asllength")
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/* Local prototypes */
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static UINT8
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CgGetPackageLenByteCount (
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ACPI_PARSE_OBJECT *Op,
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UINT32 PackageLength);
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static void
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CgGenerateAmlOpcodeLength (
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ACPI_PARSE_OBJECT *Op);
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#ifdef ACPI_OBSOLETE_FUNCTIONS
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void
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LnAdjustLengthToRoot (
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ACPI_PARSE_OBJECT *Op,
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UINT32 LengthDelta);
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#endif
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/*******************************************************************************
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*
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* FUNCTION: LnInitLengthsWalk
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*
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* PARAMETERS: ASL_WALK_CALLBACK
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*
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* RETURN: Status
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*
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* DESCRIPTION: Walk callback to initialize (and re-initialize) the node
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* subtree length(s) to zero. The Subtree lengths are bubbled
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* up to the root node in order to get a total AML length.
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*
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******************************************************************************/
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ACPI_STATUS
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LnInitLengthsWalk (
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ACPI_PARSE_OBJECT *Op,
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UINT32 Level,
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void *Context)
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{
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Op->Asl.AmlSubtreeLength = 0;
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: LnPackageLengthWalk
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*
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* PARAMETERS: ASL_WALK_CALLBACK
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*
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* RETURN: Status
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*
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* DESCRIPTION: Walk callback to calculate the total AML length.
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* 1) Calculate the AML lengths (opcode, package length, etc.) for
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* THIS node.
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* 2) Bubbble up all of these lengths to the parent node by summing
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* them all into the parent subtree length.
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*
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* Note: The SubtreeLength represents the total AML length of all child nodes
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* in all subtrees under a given node. Therefore, once this walk is
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* complete, the Root Node subtree length is the AML length of the entire
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* tree (and thus, the entire ACPI table)
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*
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******************************************************************************/
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ACPI_STATUS
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LnPackageLengthWalk (
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ACPI_PARSE_OBJECT *Op,
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UINT32 Level,
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void *Context)
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{
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/* Generate the AML lengths for this node */
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CgGenerateAmlLengths (Op);
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/* Bubble up all lengths (this node and all below it) to the parent */
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if ((Op->Asl.Parent) &&
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(Op->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG))
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{
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Op->Asl.Parent->Asl.AmlSubtreeLength += (Op->Asl.AmlLength +
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Op->Asl.AmlOpcodeLength +
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Op->Asl.AmlPkgLenBytes +
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Op->Asl.AmlSubtreeLength);
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: CgGetPackageLenByteCount
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*
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* PARAMETERS: Op - Parse node
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* PackageLength - Length to be encoded
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*
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* RETURN: Required length of the package length encoding
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*
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* DESCRIPTION: Calculate the number of bytes required to encode the given
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* package length.
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*
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******************************************************************************/
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static UINT8
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CgGetPackageLenByteCount (
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ACPI_PARSE_OBJECT *Op,
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UINT32 PackageLength)
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{
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/*
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* Determine the number of bytes required to encode the package length
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* Note: the package length includes the number of bytes used to encode
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* the package length, so we must account for this also.
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*/
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if (PackageLength <= (0x0000003F - 1))
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{
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return (1);
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}
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else if (PackageLength <= (0x00000FFF - 2))
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{
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return (2);
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}
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else if (PackageLength <= (0x000FFFFF - 3))
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{
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return (3);
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}
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else if (PackageLength <= (0x0FFFFFFF - 4))
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{
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return (4);
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}
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else
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{
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/* Fatal error - the package length is too large to encode */
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AslError (ASL_ERROR, ASL_MSG_ENCODING_LENGTH, Op, NULL);
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}
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return (0);
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}
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/*******************************************************************************
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*
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* FUNCTION: CgGenerateAmlOpcodeLength
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*
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* PARAMETERS: Op - Parse node whose AML opcode lengths will be
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* calculated
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*
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* RETURN: None.
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*
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* DESCRIPTION: Calculate the AmlOpcodeLength, AmlPkgLenBytes, and AmlLength
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* fields for this node.
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*
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******************************************************************************/
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static void
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CgGenerateAmlOpcodeLength (
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ACPI_PARSE_OBJECT *Op)
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{
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/* Check for two-byte opcode */
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if (Op->Asl.AmlOpcode > 0x00FF)
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{
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Op->Asl.AmlOpcodeLength = 2;
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}
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else
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{
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Op->Asl.AmlOpcodeLength = 1;
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}
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/* Does this opcode have an associated "PackageLength" field? */
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Op->Asl.AmlPkgLenBytes = 0;
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if (Op->Asl.CompileFlags & NODE_AML_PACKAGE)
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{
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Op->Asl.AmlPkgLenBytes = CgGetPackageLenByteCount (
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Op, Op->Asl.AmlSubtreeLength);
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}
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/* Data opcode lengths are easy */
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switch (Op->Asl.AmlOpcode)
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{
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case AML_BYTE_OP:
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Op->Asl.AmlLength = 1;
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break;
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case AML_WORD_OP:
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Op->Asl.AmlLength = 2;
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break;
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case AML_DWORD_OP:
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Op->Asl.AmlLength = 4;
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break;
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case AML_QWORD_OP:
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Op->Asl.AmlLength = 8;
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break;
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default:
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/* All data opcodes must be above */
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break;
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: CgGenerateAmlLengths
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*
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* PARAMETERS: Op - Parse node
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*
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* RETURN: None.
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*
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* DESCRIPTION: Generate internal length fields based on the AML opcode or
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* parse opcode.
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*
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******************************************************************************/
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void
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CgGenerateAmlLengths (
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ACPI_PARSE_OBJECT *Op)
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{
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char *Buffer;
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ACPI_STATUS Status;
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switch (Op->Asl.AmlOpcode)
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{
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case AML_RAW_DATA_BYTE:
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Op->Asl.AmlOpcodeLength = 0;
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Op->Asl.AmlLength = 1;
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return;
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case AML_RAW_DATA_WORD:
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Op->Asl.AmlOpcodeLength = 0;
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Op->Asl.AmlLength = 2;
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return;
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case AML_RAW_DATA_DWORD:
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Op->Asl.AmlOpcodeLength = 0;
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Op->Asl.AmlLength = 4;
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return;
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case AML_RAW_DATA_QWORD:
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Op->Asl.AmlOpcodeLength = 0;
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Op->Asl.AmlLength = 8;
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return;
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case AML_RAW_DATA_BUFFER:
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/* Aml length is/was set by creator */
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Op->Asl.AmlOpcodeLength = 0;
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return;
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case AML_RAW_DATA_CHAIN:
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/* Aml length is/was set by creator */
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Op->Asl.AmlOpcodeLength = 0;
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return;
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default:
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break;
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}
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switch (Op->Asl.ParseOpcode)
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{
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case PARSEOP_DEFINITIONBLOCK:
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Gbl_TableLength = sizeof (ACPI_TABLE_HEADER) +
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Op->Asl.AmlSubtreeLength;
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break;
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case PARSEOP_NAMESEG:
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Op->Asl.AmlOpcodeLength = 0;
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Op->Asl.AmlLength = 4;
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Op->Asl.ExternalName = Op->Asl.Value.String;
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break;
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case PARSEOP_NAMESTRING:
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case PARSEOP_METHODCALL:
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if (Op->Asl.CompileFlags & NODE_NAME_INTERNALIZED)
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{
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break;
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}
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Op->Asl.AmlOpcodeLength = 0;
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Status = UtInternalizeName (Op->Asl.Value.String, &Buffer);
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if (ACPI_FAILURE (Status))
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{
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DbgPrint (ASL_DEBUG_OUTPUT,
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"Failure from internalize name %X\n", Status);
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break;
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}
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Op->Asl.ExternalName = Op->Asl.Value.String;
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Op->Asl.Value.String = Buffer;
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Op->Asl.CompileFlags |= NODE_NAME_INTERNALIZED;
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Op->Asl.AmlLength = strlen (Buffer);
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/*
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* Check for single backslash reference to root,
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* make it a null terminated string in the AML
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*/
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if (Op->Asl.AmlLength == 1)
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{
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Op->Asl.AmlLength = 2;
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}
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break;
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case PARSEOP_STRING_LITERAL:
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Op->Asl.AmlOpcodeLength = 1;
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/* Get null terminator */
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Op->Asl.AmlLength = strlen (Op->Asl.Value.String) + 1;
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break;
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case PARSEOP_PACKAGE_LENGTH:
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Op->Asl.AmlOpcodeLength = 0;
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Op->Asl.AmlPkgLenBytes = CgGetPackageLenByteCount (Op,
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(UINT32) Op->Asl.Value.Integer);
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break;
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case PARSEOP_RAW_DATA:
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Op->Asl.AmlOpcodeLength = 0;
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break;
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case PARSEOP_DEFAULT_ARG:
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case PARSEOP_EXTERNAL:
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case PARSEOP_INCLUDE:
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case PARSEOP_INCLUDE_END:
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/* Ignore the "default arg" nodes, they are extraneous at this point */
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break;
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default:
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CgGenerateAmlOpcodeLength (Op);
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break;
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}
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}
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#ifdef ACPI_OBSOLETE_FUNCTIONS
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/*******************************************************************************
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*
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* FUNCTION: LnAdjustLengthToRoot
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*
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* PARAMETERS: Op - Node whose Length was changed
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*
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* RETURN: None.
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*
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* DESCRIPTION: Change the Subtree length of the given node, and bubble the
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* change all the way up to the root node. This allows for
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* last second changes to a package length (for example, if the
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* package length encoding gets shorter or longer.)
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*
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******************************************************************************/
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void
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LnAdjustLengthToRoot (
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ACPI_PARSE_OBJECT *SubtreeOp,
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UINT32 LengthDelta)
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{
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ACPI_PARSE_OBJECT *Op;
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/* Adjust all subtree lengths up to the root */
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Op = SubtreeOp->Asl.Parent;
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while (Op)
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{
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Op->Asl.AmlSubtreeLength -= LengthDelta;
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Op = Op->Asl.Parent;
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}
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/* Adjust the global table length */
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Gbl_TableLength -= LengthDelta;
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}
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#endif
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