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/******************************************************************************
*
* Module Name: psargs - Parse AML opcode arguments
*
*****************************************************************************/
/*
* 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.
*/
#define __PSARGS_C__
#include <contrib/dev/acpica/include/acpi.h>
#include <contrib/dev/acpica/include/accommon.h>
#include <contrib/dev/acpica/include/acparser.h>
#include <contrib/dev/acpica/include/amlcode.h>
#include <contrib/dev/acpica/include/acnamesp.h>
#include <contrib/dev/acpica/include/acdispat.h>
#define _COMPONENT ACPI_PARSER
ACPI_MODULE_NAME ("psargs")
/* Local prototypes */
static UINT32
AcpiPsGetNextPackageLength (
ACPI_PARSE_STATE *ParserState);
static ACPI_PARSE_OBJECT *
AcpiPsGetNextField (
ACPI_PARSE_STATE *ParserState);
/*******************************************************************************
*
* FUNCTION: AcpiPsGetNextPackageLength
*
* PARAMETERS: ParserState - Current parser state object
*
* RETURN: Decoded package length. On completion, the AML pointer points
* past the length byte or bytes.
*
* DESCRIPTION: Decode and return a package length field.
* Note: Largest package length is 28 bits, from ACPI specification
*
******************************************************************************/
static UINT32
AcpiPsGetNextPackageLength (
ACPI_PARSE_STATE *ParserState)
{
UINT8 *Aml = ParserState->Aml;
UINT32 PackageLength = 0;
UINT32 ByteCount;
UINT8 ByteZeroMask = 0x3F; /* Default [0:5] */
ACPI_FUNCTION_TRACE (PsGetNextPackageLength);
/*
* Byte 0 bits [6:7] contain the number of additional bytes
* used to encode the package length, either 0,1,2, or 3
*/
ByteCount = (Aml[0] >> 6);
ParserState->Aml += ((ACPI_SIZE) ByteCount + 1);
/* Get bytes 3, 2, 1 as needed */
while (ByteCount)
{
/*
* Final bit positions for the package length bytes:
* Byte3->[20:27]
* Byte2->[12:19]
* Byte1->[04:11]
* Byte0->[00:03]
*/
PackageLength |= (Aml[ByteCount] << ((ByteCount << 3) - 4));
ByteZeroMask = 0x0F; /* Use bits [0:3] of byte 0 */
ByteCount--;
}
/* Byte 0 is a special case, either bits [0:3] or [0:5] are used */
PackageLength |= (Aml[0] & ByteZeroMask);
return_UINT32 (PackageLength);
}
/*******************************************************************************
*
* FUNCTION: AcpiPsGetNextPackageEnd
*
* PARAMETERS: ParserState - Current parser state object
*
* RETURN: Pointer to end-of-package +1
*
* DESCRIPTION: Get next package length and return a pointer past the end of
* the package. Consumes the package length field
*
******************************************************************************/
UINT8 *
AcpiPsGetNextPackageEnd (
ACPI_PARSE_STATE *ParserState)
{
UINT8 *Start = ParserState->Aml;
UINT32 PackageLength;
ACPI_FUNCTION_TRACE (PsGetNextPackageEnd);
/* Function below updates ParserState->Aml */
PackageLength = AcpiPsGetNextPackageLength (ParserState);
return_PTR (Start + PackageLength); /* end of package */
}
/*******************************************************************************
*
* FUNCTION: AcpiPsGetNextNamestring
*
* PARAMETERS: ParserState - Current parser state object
*
* RETURN: Pointer to the start of the name string (pointer points into
* the AML.
*
* DESCRIPTION: Get next raw namestring within the AML stream. Handles all name
* prefix characters. Set parser state to point past the string.
* (Name is consumed from the AML.)
*
******************************************************************************/
char *
AcpiPsGetNextNamestring (
ACPI_PARSE_STATE *ParserState)
{
UINT8 *Start = ParserState->Aml;
UINT8 *End = ParserState->Aml;
ACPI_FUNCTION_TRACE (PsGetNextNamestring);
/* Point past any namestring prefix characters (backslash or carat) */
while (AcpiPsIsPrefixChar (*End))
{
End++;
}
/* Decode the path prefix character */
switch (*End)
{
case 0:
/* NullName */
if (End == Start)
{
Start = NULL;
}
End++;
break;
case AML_DUAL_NAME_PREFIX:
/* Two name segments */
End += 1 + (2 * ACPI_NAME_SIZE);
break;
case AML_MULTI_NAME_PREFIX_OP:
/* Multiple name segments, 4 chars each, count in next byte */
End += 2 + (*(End + 1) * ACPI_NAME_SIZE);
break;
default:
/* Single name segment */
End += ACPI_NAME_SIZE;
break;
}
ParserState->Aml = End;
return_PTR ((char *) Start);
}
/*******************************************************************************
*
* FUNCTION: AcpiPsGetNextNamepath
*
* PARAMETERS: ParserState - Current parser state object
* Arg - Where the namepath will be stored
* ArgCount - If the namepath points to a control method
* the method's argument is returned here.
* PossibleMethodCall - Whether the namepath can possibly be the
* start of a method call
*
* RETURN: Status
*
* DESCRIPTION: Get next name (if method call, return # of required args).
* Names are looked up in the internal namespace to determine
* if the name represents a control method. If a method
* is found, the number of arguments to the method is returned.
* This information is critical for parsing to continue correctly.
*
******************************************************************************/
ACPI_STATUS
AcpiPsGetNextNamepath (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_STATE *ParserState,
ACPI_PARSE_OBJECT *Arg,
BOOLEAN PossibleMethodCall)
{
ACPI_STATUS Status;
char *Path;
ACPI_PARSE_OBJECT *NameOp;
ACPI_OPERAND_OBJECT *MethodDesc;
ACPI_NAMESPACE_NODE *Node;
UINT8 *Start = ParserState->Aml;
ACPI_FUNCTION_TRACE (PsGetNextNamepath);
Path = AcpiPsGetNextNamestring (ParserState);
AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP);
/* Null path case is allowed, just exit */
if (!Path)
{
Arg->Common.Value.Name = Path;
return_ACPI_STATUS (AE_OK);
}
/*
* Lookup the name in the internal namespace, starting with the current
* scope. We don't want to add anything new to the namespace here,
* however, so we use MODE_EXECUTE.
* Allow searching of the parent tree, but don't open a new scope -
* we just want to lookup the object (must be mode EXECUTE to perform
* the upsearch)
*/
Status = AcpiNsLookup (WalkState->ScopeInfo, Path,
ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, NULL, &Node);
/*
* If this name is a control method invocation, we must
* setup the method call
*/
if (ACPI_SUCCESS (Status) &&
PossibleMethodCall &&
(Node->Type == ACPI_TYPE_METHOD))
{
if (WalkState->Opcode == AML_UNLOAD_OP)
{
/*
* AcpiPsGetNextNamestring has increased the AML pointer,
* so we need to restore the saved AML pointer for method call.
*/
WalkState->ParserState.Aml = Start;
WalkState->ArgCount = 1;
AcpiPsInitOp (Arg, AML_INT_METHODCALL_OP);
return_ACPI_STATUS (AE_OK);
}
/* This name is actually a control method invocation */
MethodDesc = AcpiNsGetAttachedObject (Node);
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
"Control Method - %p Desc %p Path=%p\n", Node, MethodDesc, Path));
NameOp = AcpiPsAllocOp (AML_INT_NAMEPATH_OP);
if (!NameOp)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Change Arg into a METHOD CALL and attach name to it */
AcpiPsInitOp (Arg, AML_INT_METHODCALL_OP);
NameOp->Common.Value.Name = Path;
/* Point METHODCALL/NAME to the METHOD Node */
NameOp->Common.Node = Node;
AcpiPsAppendArg (Arg, NameOp);
if (!MethodDesc)
{
ACPI_ERROR ((AE_INFO,
"Control Method %p has no attached object",
Node));
return_ACPI_STATUS (AE_AML_INTERNAL);
}
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
"Control Method - %p Args %X\n",
Node, MethodDesc->Method.ParamCount));
/* Get the number of arguments to expect */
WalkState->ArgCount = MethodDesc->Method.ParamCount;
return_ACPI_STATUS (AE_OK);
}
/*
* Special handling if the name was not found during the lookup -
* some NotFound cases are allowed
*/
if (Status == AE_NOT_FOUND)
{
/* 1) NotFound is ok during load pass 1/2 (allow forward references) */
if ((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) !=
ACPI_PARSE_EXECUTE)
{
Status = AE_OK;
}
/* 2) NotFound during a CondRefOf(x) is ok by definition */
else if (WalkState->Op->Common.AmlOpcode == AML_COND_REF_OF_OP)
{
Status = AE_OK;
}
/*
* 3) NotFound while building a Package is ok at this point, we
* may flag as an error later if slack mode is not enabled.
* (Some ASL code depends on allowing this behavior)
*/
else if ((Arg->Common.Parent) &&
((Arg->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
(Arg->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP)))
{
Status = AE_OK;
}
}
/* Final exception check (may have been changed from code above) */
if (ACPI_FAILURE (Status))
{
ACPI_ERROR_NAMESPACE (Path, Status);
if ((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) ==
ACPI_PARSE_EXECUTE)
{
/* Report a control method execution error */
Status = AcpiDsMethodError (Status, WalkState);
}
}
/* Save the namepath */
Arg->Common.Value.Name = Path;
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiPsGetNextSimpleArg
*
* PARAMETERS: ParserState - Current parser state object
* ArgType - The argument type (AML_*_ARG)
* Arg - Where the argument is returned
*
* RETURN: None
*
* DESCRIPTION: Get the next simple argument (constant, string, or namestring)
*
******************************************************************************/
void
AcpiPsGetNextSimpleArg (
ACPI_PARSE_STATE *ParserState,
UINT32 ArgType,
ACPI_PARSE_OBJECT *Arg)
{
UINT32 Length;
UINT16 Opcode;
UINT8 *Aml = ParserState->Aml;
ACPI_FUNCTION_TRACE_U32 (PsGetNextSimpleArg, ArgType);
switch (ArgType)
{
case ARGP_BYTEDATA:
/* Get 1 byte from the AML stream */
Opcode = AML_BYTE_OP;
Arg->Common.Value.Integer = (UINT64) *Aml;
Length = 1;
break;
case ARGP_WORDDATA:
/* Get 2 bytes from the AML stream */
Opcode = AML_WORD_OP;
ACPI_MOVE_16_TO_64 (&Arg->Common.Value.Integer, Aml);
Length = 2;
break;
case ARGP_DWORDDATA:
/* Get 4 bytes from the AML stream */
Opcode = AML_DWORD_OP;
ACPI_MOVE_32_TO_64 (&Arg->Common.Value.Integer, Aml);
Length = 4;
break;
case ARGP_QWORDDATA:
/* Get 8 bytes from the AML stream */
Opcode = AML_QWORD_OP;
ACPI_MOVE_64_TO_64 (&Arg->Common.Value.Integer, Aml);
Length = 8;
break;
case ARGP_CHARLIST:
/* Get a pointer to the string, point past the string */
Opcode = AML_STRING_OP;
Arg->Common.Value.String = ACPI_CAST_PTR (char, Aml);
/* Find the null terminator */
Length = 0;
while (Aml[Length])
{
Length++;
}
Length++;
break;
case ARGP_NAME:
case ARGP_NAMESTRING:
AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP);
Arg->Common.Value.Name = AcpiPsGetNextNamestring (ParserState);
return_VOID;
default:
ACPI_ERROR ((AE_INFO, "Invalid ArgType 0x%X", ArgType));
return_VOID;
}
AcpiPsInitOp (Arg, Opcode);
ParserState->Aml += Length;
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: AcpiPsGetNextField
*
* PARAMETERS: ParserState - Current parser state object
*
* RETURN: A newly allocated FIELD op
*
* DESCRIPTION: Get next field (NamedField, ReservedField, or AccessField)
*
******************************************************************************/
static ACPI_PARSE_OBJECT *
AcpiPsGetNextField (
ACPI_PARSE_STATE *ParserState)
{
UINT32 AmlOffset = (UINT32)
ACPI_PTR_DIFF (ParserState->Aml,
ParserState->AmlStart);
ACPI_PARSE_OBJECT *Field;
UINT16 Opcode;
UINT32 Name;
ACPI_FUNCTION_TRACE (PsGetNextField);
/* Determine field type */
switch (ACPI_GET8 (ParserState->Aml))
{
default:
Opcode = AML_INT_NAMEDFIELD_OP;
break;
case 0x00:
Opcode = AML_INT_RESERVEDFIELD_OP;
ParserState->Aml++;
break;
case 0x01:
Opcode = AML_INT_ACCESSFIELD_OP;
ParserState->Aml++;
break;
}
/* Allocate a new field op */
Field = AcpiPsAllocOp (Opcode);
if (!Field)
{
return_PTR (NULL);
}
Field->Common.AmlOffset = AmlOffset;
/* Decode the field type */
switch (Opcode)
{
case AML_INT_NAMEDFIELD_OP:
/* Get the 4-character name */
ACPI_MOVE_32_TO_32 (&Name, ParserState->Aml);
AcpiPsSetName (Field, Name);
ParserState->Aml += ACPI_NAME_SIZE;
/* Get the length which is encoded as a package length */
Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
break;
case AML_INT_RESERVEDFIELD_OP:
/* Get the length which is encoded as a package length */
Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
break;
case AML_INT_ACCESSFIELD_OP:
/*
* Get AccessType and AccessAttrib and merge into the field Op
* AccessType is first operand, AccessAttribute is second
*/
Field->Common.Value.Integer = (((UINT32) ACPI_GET8 (ParserState->Aml) << 8));
ParserState->Aml++;
Field->Common.Value.Integer |= ACPI_GET8 (ParserState->Aml);
ParserState->Aml++;
break;
default:
/* Opcode was set in previous switch */
break;
}
return_PTR (Field);
}
/*******************************************************************************
*
* FUNCTION: AcpiPsGetNextArg
*
* PARAMETERS: WalkState - Current state
* ParserState - Current parser state object
* ArgType - The argument type (AML_*_ARG)
* ReturnArg - Where the next arg is returned
*
* RETURN: Status, and an op object containing the next argument.
*
* DESCRIPTION: Get next argument (including complex list arguments that require
* pushing the parser stack)
*
******************************************************************************/
ACPI_STATUS
AcpiPsGetNextArg (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_STATE *ParserState,
UINT32 ArgType,
ACPI_PARSE_OBJECT **ReturnArg)
{
ACPI_PARSE_OBJECT *Arg = NULL;
ACPI_PARSE_OBJECT *Prev = NULL;
ACPI_PARSE_OBJECT *Field;
UINT32 Subop;
ACPI_STATUS Status = AE_OK;
ACPI_FUNCTION_TRACE_PTR (PsGetNextArg, ParserState);
switch (ArgType)
{
case ARGP_BYTEDATA:
case ARGP_WORDDATA:
case ARGP_DWORDDATA:
case ARGP_CHARLIST:
case ARGP_NAME:
case ARGP_NAMESTRING:
/* Constants, strings, and namestrings are all the same size */
Arg = AcpiPsAllocOp (AML_BYTE_OP);
if (!Arg)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
AcpiPsGetNextSimpleArg (ParserState, ArgType, Arg);
break;
case ARGP_PKGLENGTH:
/* Package length, nothing returned */
ParserState->PkgEnd = AcpiPsGetNextPackageEnd (ParserState);
break;
case ARGP_FIELDLIST:
if (ParserState->Aml < ParserState->PkgEnd)
{
/* Non-empty list */
while (ParserState->Aml < ParserState->PkgEnd)
{
Field = AcpiPsGetNextField (ParserState);
if (!Field)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
if (Prev)
{
Prev->Common.Next = Field;
}
else
{
Arg = Field;
}
Prev = Field;
}
/* Skip to End of byte data */
ParserState->Aml = ParserState->PkgEnd;
}
break;
case ARGP_BYTELIST:
if (ParserState->Aml < ParserState->PkgEnd)
{
/* Non-empty list */
Arg = AcpiPsAllocOp (AML_INT_BYTELIST_OP);
if (!Arg)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Fill in bytelist data */
Arg->Common.Value.Size = (UINT32)
ACPI_PTR_DIFF (ParserState->PkgEnd, ParserState->Aml);
Arg->Named.Data = ParserState->Aml;
/* Skip to End of byte data */
ParserState->Aml = ParserState->PkgEnd;
}
break;
case ARGP_TARGET:
case ARGP_SUPERNAME:
case ARGP_SIMPLENAME:
Subop = AcpiPsPeekOpcode (ParserState);
if (Subop == 0 ||
AcpiPsIsLeadingChar (Subop) ||
AcpiPsIsPrefixChar (Subop))
{
/* NullName or NameString */
Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP);
if (!Arg)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* To support SuperName arg of Unload */
if (WalkState->Opcode == AML_UNLOAD_OP)
{
Status = AcpiPsGetNextNamepath (WalkState, ParserState, Arg, 1);
/*
* If the SuperName arg of Unload is a method call,
* we have restored the AML pointer, just free this Arg
*/
if (Arg->Common.AmlOpcode == AML_INT_METHODCALL_OP)
{
AcpiPsFreeOp (Arg);
Arg = NULL;
}
}
else
{
Status = AcpiPsGetNextNamepath (WalkState, ParserState, Arg, 0);
}
}
else
{
/* Single complex argument, nothing returned */
WalkState->ArgCount = 1;
}
break;
case ARGP_DATAOBJ:
case ARGP_TERMARG:
/* Single complex argument, nothing returned */
WalkState->ArgCount = 1;
break;
case ARGP_DATAOBJLIST:
case ARGP_TERMLIST:
case ARGP_OBJLIST:
if (ParserState->Aml < ParserState->PkgEnd)
{
/* Non-empty list of variable arguments, nothing returned */
WalkState->ArgCount = ACPI_VAR_ARGS;
}
break;
default:
ACPI_ERROR ((AE_INFO, "Invalid ArgType: 0x%X", ArgType));
Status = AE_AML_OPERAND_TYPE;
break;
}
*ReturnArg = Arg;
return_ACPI_STATUS (Status);
}