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| Current File : //sys/contrib/dev/acpica/compiler/asllength.c |
/******************************************************************************
*
* Module Name: asllength - Tree walk to determine package and opcode lengths
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2011, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <contrib/dev/acpica/compiler/aslcompiler.h>
#include "aslcompiler.y.h"
#include <contrib/dev/acpica/include/amlcode.h>
#define _COMPONENT ACPI_COMPILER
ACPI_MODULE_NAME ("asllength")
/* Local prototypes */
static UINT8
CgGetPackageLenByteCount (
ACPI_PARSE_OBJECT *Op,
UINT32 PackageLength);
static void
CgGenerateAmlOpcodeLength (
ACPI_PARSE_OBJECT *Op);
#ifdef ACPI_OBSOLETE_FUNCTIONS
void
LnAdjustLengthToRoot (
ACPI_PARSE_OBJECT *Op,
UINT32 LengthDelta);
#endif
/*******************************************************************************
*
* FUNCTION: LnInitLengthsWalk
*
* PARAMETERS: ASL_WALK_CALLBACK
*
* RETURN: Status
*
* DESCRIPTION: Walk callback to initialize (and re-initialize) the node
* subtree length(s) to zero. The Subtree lengths are bubbled
* up to the root node in order to get a total AML length.
*
******************************************************************************/
ACPI_STATUS
LnInitLengthsWalk (
ACPI_PARSE_OBJECT *Op,
UINT32 Level,
void *Context)
{
Op->Asl.AmlSubtreeLength = 0;
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: LnPackageLengthWalk
*
* PARAMETERS: ASL_WALK_CALLBACK
*
* RETURN: Status
*
* DESCRIPTION: Walk callback to calculate the total AML length.
* 1) Calculate the AML lengths (opcode, package length, etc.) for
* THIS node.
* 2) Bubbble up all of these lengths to the parent node by summing
* them all into the parent subtree length.
*
* Note: The SubtreeLength represents the total AML length of all child nodes
* in all subtrees under a given node. Therefore, once this walk is
* complete, the Root Node subtree length is the AML length of the entire
* tree (and thus, the entire ACPI table)
*
******************************************************************************/
ACPI_STATUS
LnPackageLengthWalk (
ACPI_PARSE_OBJECT *Op,
UINT32 Level,
void *Context)
{
/* Generate the AML lengths for this node */
CgGenerateAmlLengths (Op);
/* Bubble up all lengths (this node and all below it) to the parent */
if ((Op->Asl.Parent) &&
(Op->Asl.ParseOpcode != PARSEOP_DEFAULT_ARG))
{
Op->Asl.Parent->Asl.AmlSubtreeLength += (Op->Asl.AmlLength +
Op->Asl.AmlOpcodeLength +
Op->Asl.AmlPkgLenBytes +
Op->Asl.AmlSubtreeLength);
}
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: CgGetPackageLenByteCount
*
* PARAMETERS: Op - Parse node
* PackageLength - Length to be encoded
*
* RETURN: Required length of the package length encoding
*
* DESCRIPTION: Calculate the number of bytes required to encode the given
* package length.
*
******************************************************************************/
static UINT8
CgGetPackageLenByteCount (
ACPI_PARSE_OBJECT *Op,
UINT32 PackageLength)
{
/*
* Determine the number of bytes required to encode the package length
* Note: the package length includes the number of bytes used to encode
* the package length, so we must account for this also.
*/
if (PackageLength <= (0x0000003F - 1))
{
return (1);
}
else if (PackageLength <= (0x00000FFF - 2))
{
return (2);
}
else if (PackageLength <= (0x000FFFFF - 3))
{
return (3);
}
else if (PackageLength <= (0x0FFFFFFF - 4))
{
return (4);
}
else
{
/* Fatal error - the package length is too large to encode */
AslError (ASL_ERROR, ASL_MSG_ENCODING_LENGTH, Op, NULL);
}
return (0);
}
/*******************************************************************************
*
* FUNCTION: CgGenerateAmlOpcodeLength
*
* PARAMETERS: Op - Parse node whose AML opcode lengths will be
* calculated
*
* RETURN: None.
*
* DESCRIPTION: Calculate the AmlOpcodeLength, AmlPkgLenBytes, and AmlLength
* fields for this node.
*
******************************************************************************/
static void
CgGenerateAmlOpcodeLength (
ACPI_PARSE_OBJECT *Op)
{
/* Check for two-byte opcode */
if (Op->Asl.AmlOpcode > 0x00FF)
{
Op->Asl.AmlOpcodeLength = 2;
}
else
{
Op->Asl.AmlOpcodeLength = 1;
}
/* Does this opcode have an associated "PackageLength" field? */
Op->Asl.AmlPkgLenBytes = 0;
if (Op->Asl.CompileFlags & NODE_AML_PACKAGE)
{
Op->Asl.AmlPkgLenBytes = CgGetPackageLenByteCount (
Op, Op->Asl.AmlSubtreeLength);
}
/* Data opcode lengths are easy */
switch (Op->Asl.AmlOpcode)
{
case AML_BYTE_OP:
Op->Asl.AmlLength = 1;
break;
case AML_WORD_OP:
Op->Asl.AmlLength = 2;
break;
case AML_DWORD_OP:
Op->Asl.AmlLength = 4;
break;
case AML_QWORD_OP:
Op->Asl.AmlLength = 8;
break;
default:
/* All data opcodes must be above */
break;
}
}
/*******************************************************************************
*
* FUNCTION: CgGenerateAmlLengths
*
* PARAMETERS: Op - Parse node
*
* RETURN: None.
*
* DESCRIPTION: Generate internal length fields based on the AML opcode or
* parse opcode.
*
******************************************************************************/
void
CgGenerateAmlLengths (
ACPI_PARSE_OBJECT *Op)
{
char *Buffer;
ACPI_STATUS Status;
switch (Op->Asl.AmlOpcode)
{
case AML_RAW_DATA_BYTE:
Op->Asl.AmlOpcodeLength = 0;
Op->Asl.AmlLength = 1;
return;
case AML_RAW_DATA_WORD:
Op->Asl.AmlOpcodeLength = 0;
Op->Asl.AmlLength = 2;
return;
case AML_RAW_DATA_DWORD:
Op->Asl.AmlOpcodeLength = 0;
Op->Asl.AmlLength = 4;
return;
case AML_RAW_DATA_QWORD:
Op->Asl.AmlOpcodeLength = 0;
Op->Asl.AmlLength = 8;
return;
case AML_RAW_DATA_BUFFER:
/* Aml length is/was set by creator */
Op->Asl.AmlOpcodeLength = 0;
return;
case AML_RAW_DATA_CHAIN:
/* Aml length is/was set by creator */
Op->Asl.AmlOpcodeLength = 0;
return;
default:
break;
}
switch (Op->Asl.ParseOpcode)
{
case PARSEOP_DEFINITIONBLOCK:
Gbl_TableLength = sizeof (ACPI_TABLE_HEADER) +
Op->Asl.AmlSubtreeLength;
break;
case PARSEOP_NAMESEG:
Op->Asl.AmlOpcodeLength = 0;
Op->Asl.AmlLength = 4;
Op->Asl.ExternalName = Op->Asl.Value.String;
break;
case PARSEOP_NAMESTRING:
case PARSEOP_METHODCALL:
if (Op->Asl.CompileFlags & NODE_NAME_INTERNALIZED)
{
break;
}
Op->Asl.AmlOpcodeLength = 0;
Status = UtInternalizeName (Op->Asl.Value.String, &Buffer);
if (ACPI_FAILURE (Status))
{
DbgPrint (ASL_DEBUG_OUTPUT,
"Failure from internalize name %X\n", Status);
break;
}
Op->Asl.ExternalName = Op->Asl.Value.String;
Op->Asl.Value.String = Buffer;
Op->Asl.CompileFlags |= NODE_NAME_INTERNALIZED;
Op->Asl.AmlLength = strlen (Buffer);
/*
* Check for single backslash reference to root,
* make it a null terminated string in the AML
*/
if (Op->Asl.AmlLength == 1)
{
Op->Asl.AmlLength = 2;
}
break;
case PARSEOP_STRING_LITERAL:
Op->Asl.AmlOpcodeLength = 1;
/* Get null terminator */
Op->Asl.AmlLength = strlen (Op->Asl.Value.String) + 1;
break;
case PARSEOP_PACKAGE_LENGTH:
Op->Asl.AmlOpcodeLength = 0;
Op->Asl.AmlPkgLenBytes = CgGetPackageLenByteCount (Op,
(UINT32) Op->Asl.Value.Integer);
break;
case PARSEOP_RAW_DATA:
Op->Asl.AmlOpcodeLength = 0;
break;
case PARSEOP_DEFAULT_ARG:
case PARSEOP_EXTERNAL:
case PARSEOP_INCLUDE:
case PARSEOP_INCLUDE_END:
/* Ignore the "default arg" nodes, they are extraneous at this point */
break;
default:
CgGenerateAmlOpcodeLength (Op);
break;
}
}
#ifdef ACPI_OBSOLETE_FUNCTIONS
/*******************************************************************************
*
* FUNCTION: LnAdjustLengthToRoot
*
* PARAMETERS: Op - Node whose Length was changed
*
* RETURN: None.
*
* DESCRIPTION: Change the Subtree length of the given node, and bubble the
* change all the way up to the root node. This allows for
* last second changes to a package length (for example, if the
* package length encoding gets shorter or longer.)
*
******************************************************************************/
void
LnAdjustLengthToRoot (
ACPI_PARSE_OBJECT *SubtreeOp,
UINT32 LengthDelta)
{
ACPI_PARSE_OBJECT *Op;
/* Adjust all subtree lengths up to the root */
Op = SubtreeOp->Asl.Parent;
while (Op)
{
Op->Asl.AmlSubtreeLength -= LengthDelta;
Op = Op->Asl.Parent;
}
/* Adjust the global table length */
Gbl_TableLength -= LengthDelta;
}
#endif