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/******************************************************************************
*
* Module Name: psloop - Main AML parse loop
*
*****************************************************************************/
/*
* 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.
*/
/*
* Parse the AML and build an operation tree as most interpreters, (such as
* Perl) do. Parsing is done by hand rather than with a YACC generated parser
* to tightly constrain stack and dynamic memory usage. Parsing is kept
* flexible and the code fairly compact by parsing based on a list of AML
* opcode templates in AmlOpInfo[].
*/
#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/acdispat.h>
#include <contrib/dev/acpica/include/amlcode.h>
#define _COMPONENT ACPI_PARSER
ACPI_MODULE_NAME ("psloop")
static UINT32 AcpiGbl_Depth = 0;
/* Local prototypes */
static ACPI_STATUS
AcpiPsGetAmlOpcode (
ACPI_WALK_STATE *WalkState);
static ACPI_STATUS
AcpiPsBuildNamedOp (
ACPI_WALK_STATE *WalkState,
UINT8 *AmlOpStart,
ACPI_PARSE_OBJECT *UnnamedOp,
ACPI_PARSE_OBJECT **Op);
static ACPI_STATUS
AcpiPsCreateOp (
ACPI_WALK_STATE *WalkState,
UINT8 *AmlOpStart,
ACPI_PARSE_OBJECT **NewOp);
static ACPI_STATUS
AcpiPsGetArguments (
ACPI_WALK_STATE *WalkState,
UINT8 *AmlOpStart,
ACPI_PARSE_OBJECT *Op);
static ACPI_STATUS
AcpiPsCompleteOp (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT **Op,
ACPI_STATUS Status);
static ACPI_STATUS
AcpiPsCompleteFinalOp (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT *Op,
ACPI_STATUS Status);
static void
AcpiPsLinkModuleCode (
ACPI_PARSE_OBJECT *ParentOp,
UINT8 *AmlStart,
UINT32 AmlLength,
ACPI_OWNER_ID OwnerId);
/*******************************************************************************
*
* FUNCTION: AcpiPsGetAmlOpcode
*
* PARAMETERS: WalkState - Current state
*
* RETURN: Status
*
* DESCRIPTION: Extract the next AML opcode from the input stream.
*
******************************************************************************/
static ACPI_STATUS
AcpiPsGetAmlOpcode (
ACPI_WALK_STATE *WalkState)
{
ACPI_FUNCTION_TRACE_PTR (PsGetAmlOpcode, WalkState);
WalkState->AmlOffset = (UINT32) ACPI_PTR_DIFF (WalkState->ParserState.Aml,
WalkState->ParserState.AmlStart);
WalkState->Opcode = AcpiPsPeekOpcode (&(WalkState->ParserState));
/*
* First cut to determine what we have found:
* 1) A valid AML opcode
* 2) A name string
* 3) An unknown/invalid opcode
*/
WalkState->OpInfo = AcpiPsGetOpcodeInfo (WalkState->Opcode);
switch (WalkState->OpInfo->Class)
{
case AML_CLASS_ASCII:
case AML_CLASS_PREFIX:
/*
* Starts with a valid prefix or ASCII char, this is a name
* string. Convert the bare name string to a namepath.
*/
WalkState->Opcode = AML_INT_NAMEPATH_OP;
WalkState->ArgTypes = ARGP_NAMESTRING;
break;
case AML_CLASS_UNKNOWN:
/* The opcode is unrecognized. Just skip unknown opcodes */
ACPI_ERROR ((AE_INFO,
"Found unknown opcode 0x%X at AML address %p offset 0x%X, ignoring",
WalkState->Opcode, WalkState->ParserState.Aml, WalkState->AmlOffset));
ACPI_DUMP_BUFFER (WalkState->ParserState.Aml, 128);
/* Assume one-byte bad opcode */
WalkState->ParserState.Aml++;
return_ACPI_STATUS (AE_CTRL_PARSE_CONTINUE);
default:
/* Found opcode info, this is a normal opcode */
WalkState->ParserState.Aml += AcpiPsGetOpcodeSize (WalkState->Opcode);
WalkState->ArgTypes = WalkState->OpInfo->ParseArgs;
break;
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiPsBuildNamedOp
*
* PARAMETERS: WalkState - Current state
* AmlOpStart - Begin of named Op in AML
* UnnamedOp - Early Op (not a named Op)
* Op - Returned Op
*
* RETURN: Status
*
* DESCRIPTION: Parse a named Op
*
******************************************************************************/
static ACPI_STATUS
AcpiPsBuildNamedOp (
ACPI_WALK_STATE *WalkState,
UINT8 *AmlOpStart,
ACPI_PARSE_OBJECT *UnnamedOp,
ACPI_PARSE_OBJECT **Op)
{
ACPI_STATUS Status = AE_OK;
ACPI_PARSE_OBJECT *Arg = NULL;
ACPI_FUNCTION_TRACE_PTR (PsBuildNamedOp, WalkState);
UnnamedOp->Common.Value.Arg = NULL;
UnnamedOp->Common.ArgListLength = 0;
UnnamedOp->Common.AmlOpcode = WalkState->Opcode;
/*
* Get and append arguments until we find the node that contains
* the name (the type ARGP_NAME).
*/
while (GET_CURRENT_ARG_TYPE (WalkState->ArgTypes) &&
(GET_CURRENT_ARG_TYPE (WalkState->ArgTypes) != ARGP_NAME))
{
Status = AcpiPsGetNextArg (WalkState, &(WalkState->ParserState),
GET_CURRENT_ARG_TYPE (WalkState->ArgTypes), &Arg);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
AcpiPsAppendArg (UnnamedOp, Arg);
INCREMENT_ARG_LIST (WalkState->ArgTypes);
}
/*
* Make sure that we found a NAME and didn't run out of arguments
*/
if (!GET_CURRENT_ARG_TYPE (WalkState->ArgTypes))
{
return_ACPI_STATUS (AE_AML_NO_OPERAND);
}
/* We know that this arg is a name, move to next arg */
INCREMENT_ARG_LIST (WalkState->ArgTypes);
/*
* Find the object. This will either insert the object into
* the namespace or simply look it up
*/
WalkState->Op = NULL;
Status = WalkState->DescendingCallback (WalkState, Op);
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status, "During name lookup/catalog"));
return_ACPI_STATUS (Status);
}
if (!*Op)
{
return_ACPI_STATUS (AE_CTRL_PARSE_CONTINUE);
}
Status = AcpiPsNextParseState (WalkState, *Op, Status);
if (ACPI_FAILURE (Status))
{
if (Status == AE_CTRL_PENDING)
{
return_ACPI_STATUS (AE_CTRL_PARSE_PENDING);
}
return_ACPI_STATUS (Status);
}
AcpiPsAppendArg (*Op, UnnamedOp->Common.Value.Arg);
AcpiGbl_Depth++;
if ((*Op)->Common.AmlOpcode == AML_REGION_OP ||
(*Op)->Common.AmlOpcode == AML_DATA_REGION_OP)
{
/*
* Defer final parsing of an OperationRegion body, because we don't
* have enough info in the first pass to parse it correctly (i.e.,
* there may be method calls within the TermArg elements of the body.)
*
* However, we must continue parsing because the opregion is not a
* standalone package -- we don't know where the end is at this point.
*
* (Length is unknown until parse of the body complete)
*/
(*Op)->Named.Data = AmlOpStart;
(*Op)->Named.Length = 0;
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiPsCreateOp
*
* PARAMETERS: WalkState - Current state
* AmlOpStart - Op start in AML
* NewOp - Returned Op
*
* RETURN: Status
*
* DESCRIPTION: Get Op from AML
*
******************************************************************************/
static ACPI_STATUS
AcpiPsCreateOp (
ACPI_WALK_STATE *WalkState,
UINT8 *AmlOpStart,
ACPI_PARSE_OBJECT **NewOp)
{
ACPI_STATUS Status = AE_OK;
ACPI_PARSE_OBJECT *Op;
ACPI_PARSE_OBJECT *NamedOp = NULL;
ACPI_PARSE_OBJECT *ParentScope;
UINT8 ArgumentCount;
const ACPI_OPCODE_INFO *OpInfo;
ACPI_FUNCTION_TRACE_PTR (PsCreateOp, WalkState);
Status = AcpiPsGetAmlOpcode (WalkState);
if (Status == AE_CTRL_PARSE_CONTINUE)
{
return_ACPI_STATUS (AE_CTRL_PARSE_CONTINUE);
}
/* Create Op structure and append to parent's argument list */
WalkState->OpInfo = AcpiPsGetOpcodeInfo (WalkState->Opcode);
Op = AcpiPsAllocOp (WalkState->Opcode);
if (!Op)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
if (WalkState->OpInfo->Flags & AML_NAMED)
{
Status = AcpiPsBuildNamedOp (WalkState, AmlOpStart, Op, &NamedOp);
AcpiPsFreeOp (Op);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
*NewOp = NamedOp;
return_ACPI_STATUS (AE_OK);
}
/* Not a named opcode, just allocate Op and append to parent */
if (WalkState->OpInfo->Flags & AML_CREATE)
{
/*
* Backup to beginning of CreateXXXfield declaration
* BodyLength is unknown until we parse the body
*/
Op->Named.Data = AmlOpStart;
Op->Named.Length = 0;
}
if (WalkState->Opcode == AML_BANK_FIELD_OP)
{
/*
* Backup to beginning of BankField declaration
* BodyLength is unknown until we parse the body
*/
Op->Named.Data = AmlOpStart;
Op->Named.Length = 0;
}
ParentScope = AcpiPsGetParentScope (&(WalkState->ParserState));
AcpiPsAppendArg (ParentScope, Op);
if (ParentScope)
{
OpInfo = AcpiPsGetOpcodeInfo (ParentScope->Common.AmlOpcode);
if (OpInfo->Flags & AML_HAS_TARGET)
{
ArgumentCount = AcpiPsGetArgumentCount (OpInfo->Type);
if (ParentScope->Common.ArgListLength > ArgumentCount)
{
Op->Common.Flags |= ACPI_PARSEOP_TARGET;
}
}
else if (ParentScope->Common.AmlOpcode == AML_INCREMENT_OP)
{
Op->Common.Flags |= ACPI_PARSEOP_TARGET;
}
}
if (WalkState->DescendingCallback != NULL)
{
/*
* Find the object. This will either insert the object into
* the namespace or simply look it up
*/
WalkState->Op = *NewOp = Op;
Status = WalkState->DescendingCallback (WalkState, &Op);
Status = AcpiPsNextParseState (WalkState, Op, Status);
if (Status == AE_CTRL_PENDING)
{
Status = AE_CTRL_PARSE_PENDING;
}
}
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiPsGetArguments
*
* PARAMETERS: WalkState - Current state
* AmlOpStart - Op start in AML
* Op - Current Op
*
* RETURN: Status
*
* DESCRIPTION: Get arguments for passed Op.
*
******************************************************************************/
static ACPI_STATUS
AcpiPsGetArguments (
ACPI_WALK_STATE *WalkState,
UINT8 *AmlOpStart,
ACPI_PARSE_OBJECT *Op)
{
ACPI_STATUS Status = AE_OK;
ACPI_PARSE_OBJECT *Arg = NULL;
const ACPI_OPCODE_INFO *OpInfo;
ACPI_FUNCTION_TRACE_PTR (PsGetArguments, WalkState);
switch (Op->Common.AmlOpcode)
{
case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
case AML_WORD_OP: /* AML_WORDDATA_ARG */
case AML_DWORD_OP: /* AML_DWORDATA_ARG */
case AML_QWORD_OP: /* AML_QWORDATA_ARG */
case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
/* Fill in constant or string argument directly */
AcpiPsGetNextSimpleArg (&(WalkState->ParserState),
GET_CURRENT_ARG_TYPE (WalkState->ArgTypes), Op);
break;
case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
Status = AcpiPsGetNextNamepath (WalkState, &(WalkState->ParserState), Op, 1);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
WalkState->ArgTypes = 0;
break;
default:
/*
* Op is not a constant or string, append each argument to the Op
*/
while (GET_CURRENT_ARG_TYPE (WalkState->ArgTypes) && !WalkState->ArgCount)
{
WalkState->AmlOffset = (UINT32) ACPI_PTR_DIFF (WalkState->ParserState.Aml,
WalkState->ParserState.AmlStart);
Status = AcpiPsGetNextArg (WalkState, &(WalkState->ParserState),
GET_CURRENT_ARG_TYPE (WalkState->ArgTypes), &Arg);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
if (Arg)
{
Arg->Common.AmlOffset = WalkState->AmlOffset;
AcpiPsAppendArg (Op, Arg);
}
INCREMENT_ARG_LIST (WalkState->ArgTypes);
}
/*
* Handle executable code at "module-level". This refers to
* executable opcodes that appear outside of any control method.
*/
if ((WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2) &&
((WalkState->ParseFlags & ACPI_PARSE_DISASSEMBLE) == 0))
{
/*
* We want to skip If/Else/While constructs during Pass1 because we
* want to actually conditionally execute the code during Pass2.
*
* Except for disassembly, where we always want to walk the
* If/Else/While packages
*/
switch (Op->Common.AmlOpcode)
{
case AML_IF_OP:
case AML_ELSE_OP:
case AML_WHILE_OP:
/*
* Currently supported module-level opcodes are:
* IF/ELSE/WHILE. These appear to be the most common,
* and easiest to support since they open an AML
* package.
*/
if (WalkState->PassNumber == ACPI_IMODE_LOAD_PASS1)
{
AcpiPsLinkModuleCode (Op->Common.Parent, AmlOpStart,
(UINT32) (WalkState->ParserState.PkgEnd - AmlOpStart),
WalkState->OwnerId);
}
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
"Pass1: Skipping an If/Else/While body\n"));
/* Skip body of if/else/while in pass 1 */
WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd;
WalkState->ArgCount = 0;
break;
default:
/*
* Check for an unsupported executable opcode at module
* level. We must be in PASS1, the parent must be a SCOPE,
* The opcode class must be EXECUTE, and the opcode must
* not be an argument to another opcode.
*/
if ((WalkState->PassNumber == ACPI_IMODE_LOAD_PASS1) &&
(Op->Common.Parent->Common.AmlOpcode == AML_SCOPE_OP))
{
OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
if ((OpInfo->Class == AML_CLASS_EXECUTE) &&
(!Arg))
{
ACPI_WARNING ((AE_INFO,
"Detected an unsupported executable opcode "
"at module-level: [0x%.4X] at table offset 0x%.4X",
Op->Common.AmlOpcode,
(UINT32) (ACPI_PTR_DIFF (AmlOpStart,
WalkState->ParserState.AmlStart) +
sizeof (ACPI_TABLE_HEADER))));
}
}
break;
}
}
/* Special processing for certain opcodes */
switch (Op->Common.AmlOpcode)
{
case AML_METHOD_OP:
/*
* Skip parsing of control method because we don't have enough
* info in the first pass to parse it correctly.
*
* Save the length and address of the body
*/
Op->Named.Data = WalkState->ParserState.Aml;
Op->Named.Length = (UINT32)
(WalkState->ParserState.PkgEnd - WalkState->ParserState.Aml);
/* Skip body of method */
WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd;
WalkState->ArgCount = 0;
break;
case AML_BUFFER_OP:
case AML_PACKAGE_OP:
case AML_VAR_PACKAGE_OP:
if ((Op->Common.Parent) &&
(Op->Common.Parent->Common.AmlOpcode == AML_NAME_OP) &&
(WalkState->PassNumber <= ACPI_IMODE_LOAD_PASS2))
{
/*
* Skip parsing of Buffers and Packages because we don't have
* enough info in the first pass to parse them correctly.
*/
Op->Named.Data = AmlOpStart;
Op->Named.Length = (UINT32)
(WalkState->ParserState.PkgEnd - AmlOpStart);
/* Skip body */
WalkState->ParserState.Aml = WalkState->ParserState.PkgEnd;
WalkState->ArgCount = 0;
}
break;
case AML_WHILE_OP:
if (WalkState->ControlState)
{
WalkState->ControlState->Control.PackageEnd =
WalkState->ParserState.PkgEnd;
}
break;
default:
/* No action for all other opcodes */
break;
}
break;
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiPsLinkModuleCode
*
* PARAMETERS: ParentOp - Parent parser op
* AmlStart - Pointer to the AML
* AmlLength - Length of executable AML
* OwnerId - OwnerId of module level code
*
* RETURN: None.
*
* DESCRIPTION: Wrap the module-level code with a method object and link the
* object to the global list. Note, the mutex field of the method
* object is used to link multiple module-level code objects.
*
******************************************************************************/
static void
AcpiPsLinkModuleCode (
ACPI_PARSE_OBJECT *ParentOp,
UINT8 *AmlStart,
UINT32 AmlLength,
ACPI_OWNER_ID OwnerId)
{
ACPI_OPERAND_OBJECT *Prev;
ACPI_OPERAND_OBJECT *Next;
ACPI_OPERAND_OBJECT *MethodObj;
ACPI_NAMESPACE_NODE *ParentNode;
/* Get the tail of the list */
Prev = Next = AcpiGbl_ModuleCodeList;
while (Next)
{
Prev = Next;
Next = Next->Method.Mutex;
}
/*
* Insert the module level code into the list. Merge it if it is
* adjacent to the previous element.
*/
if (!Prev ||
((Prev->Method.AmlStart + Prev->Method.AmlLength) != AmlStart))
{
/* Create, initialize, and link a new temporary method object */
MethodObj = AcpiUtCreateInternalObject (ACPI_TYPE_METHOD);
if (!MethodObj)
{
return;
}
if (ParentOp->Common.Node)
{
ParentNode = ParentOp->Common.Node;
}
else
{
ParentNode = AcpiGbl_RootNode;
}
MethodObj->Method.AmlStart = AmlStart;
MethodObj->Method.AmlLength = AmlLength;
MethodObj->Method.OwnerId = OwnerId;
MethodObj->Method.InfoFlags |= ACPI_METHOD_MODULE_LEVEL;
/*
* Save the parent node in NextObject. This is cheating, but we
* don't want to expand the method object.
*/
MethodObj->Method.NextObject =
ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, ParentNode);
if (!Prev)
{
AcpiGbl_ModuleCodeList = MethodObj;
}
else
{
Prev->Method.Mutex = MethodObj;
}
}
else
{
Prev->Method.AmlLength += AmlLength;
}
}
/*******************************************************************************
*
* FUNCTION: AcpiPsCompleteOp
*
* PARAMETERS: WalkState - Current state
* Op - Returned Op
* Status - Parse status before complete Op
*
* RETURN: Status
*
* DESCRIPTION: Complete Op
*
******************************************************************************/
static ACPI_STATUS
AcpiPsCompleteOp (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT **Op,
ACPI_STATUS Status)
{
ACPI_STATUS Status2;
ACPI_FUNCTION_TRACE_PTR (PsCompleteOp, WalkState);
/*
* Finished one argument of the containing scope
*/
WalkState->ParserState.Scope->ParseScope.ArgCount--;
/* Close this Op (will result in parse subtree deletion) */
Status2 = AcpiPsCompleteThisOp (WalkState, *Op);
if (ACPI_FAILURE (Status2))
{
return_ACPI_STATUS (Status2);
}
*Op = NULL;
switch (Status)
{
case AE_OK:
break;
case AE_CTRL_TRANSFER:
/* We are about to transfer to a called method */
WalkState->PrevOp = NULL;
WalkState->PrevArgTypes = WalkState->ArgTypes;
return_ACPI_STATUS (Status);
case AE_CTRL_END:
AcpiPsPopScope (&(WalkState->ParserState), Op,
&WalkState->ArgTypes, &WalkState->ArgCount);
if (*Op)
{
WalkState->Op = *Op;
WalkState->OpInfo = AcpiPsGetOpcodeInfo ((*Op)->Common.AmlOpcode);
WalkState->Opcode = (*Op)->Common.AmlOpcode;
Status = WalkState->AscendingCallback (WalkState);
Status = AcpiPsNextParseState (WalkState, *Op, Status);
Status2 = AcpiPsCompleteThisOp (WalkState, *Op);
if (ACPI_FAILURE (Status2))
{
return_ACPI_STATUS (Status2);
}
}
Status = AE_OK;
break;
case AE_CTRL_BREAK:
case AE_CTRL_CONTINUE:
/* Pop off scopes until we find the While */
while (!(*Op) || ((*Op)->Common.AmlOpcode != AML_WHILE_OP))
{
AcpiPsPopScope (&(WalkState->ParserState), Op,
&WalkState->ArgTypes, &WalkState->ArgCount);
}
/* Close this iteration of the While loop */
WalkState->Op = *Op;
WalkState->OpInfo = AcpiPsGetOpcodeInfo ((*Op)->Common.AmlOpcode);
WalkState->Opcode = (*Op)->Common.AmlOpcode;
Status = WalkState->AscendingCallback (WalkState);
Status = AcpiPsNextParseState (WalkState, *Op, Status);
Status2 = AcpiPsCompleteThisOp (WalkState, *Op);
if (ACPI_FAILURE (Status2))
{
return_ACPI_STATUS (Status2);
}
Status = AE_OK;
break;
case AE_CTRL_TERMINATE:
/* Clean up */
do
{
if (*Op)
{
Status2 = AcpiPsCompleteThisOp (WalkState, *Op);
if (ACPI_FAILURE (Status2))
{
return_ACPI_STATUS (Status2);
}
AcpiUtDeleteGenericState (
AcpiUtPopGenericState (&WalkState->ControlState));
}
AcpiPsPopScope (&(WalkState->ParserState), Op,
&WalkState->ArgTypes, &WalkState->ArgCount);
} while (*Op);
return_ACPI_STATUS (AE_OK);
default: /* All other non-AE_OK status */
do
{
if (*Op)
{
Status2 = AcpiPsCompleteThisOp (WalkState, *Op);
if (ACPI_FAILURE (Status2))
{
return_ACPI_STATUS (Status2);
}
}
AcpiPsPopScope (&(WalkState->ParserState), Op,
&WalkState->ArgTypes, &WalkState->ArgCount);
} while (*Op);
#if 0
/*
* TBD: Cleanup parse ops on error
*/
if (*Op == NULL)
{
AcpiPsPopScope (ParserState, Op,
&WalkState->ArgTypes, &WalkState->ArgCount);
}
#endif
WalkState->PrevOp = NULL;
WalkState->PrevArgTypes = WalkState->ArgTypes;
return_ACPI_STATUS (Status);
}
/* This scope complete? */
if (AcpiPsHasCompletedScope (&(WalkState->ParserState)))
{
AcpiPsPopScope (&(WalkState->ParserState), Op,
&WalkState->ArgTypes, &WalkState->ArgCount);
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", *Op));
}
else
{
*Op = NULL;
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiPsCompleteFinalOp
*
* PARAMETERS: WalkState - Current state
* Op - Current Op
* Status - Current parse status before complete last
* Op
*
* RETURN: Status
*
* DESCRIPTION: Complete last Op.
*
******************************************************************************/
static ACPI_STATUS
AcpiPsCompleteFinalOp (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT *Op,
ACPI_STATUS Status)
{
ACPI_STATUS Status2;
ACPI_FUNCTION_TRACE_PTR (PsCompleteFinalOp, WalkState);
/*
* Complete the last Op (if not completed), and clear the scope stack.
* It is easily possible to end an AML "package" with an unbounded number
* of open scopes (such as when several ASL blocks are closed with
* sequential closing braces). We want to terminate each one cleanly.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "AML package complete at Op %p\n", Op));
do
{
if (Op)
{
if (WalkState->AscendingCallback != NULL)
{
WalkState->Op = Op;
WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
WalkState->Opcode = Op->Common.AmlOpcode;
Status = WalkState->AscendingCallback (WalkState);
Status = AcpiPsNextParseState (WalkState, Op, Status);
if (Status == AE_CTRL_PENDING)
{
Status = AcpiPsCompleteOp (WalkState, &Op, AE_OK);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
if (Status == AE_CTRL_TERMINATE)
{
Status = AE_OK;
/* Clean up */
do
{
if (Op)
{
Status2 = AcpiPsCompleteThisOp (WalkState, Op);
if (ACPI_FAILURE (Status2))
{
return_ACPI_STATUS (Status2);
}
}
AcpiPsPopScope (&(WalkState->ParserState), &Op,
&WalkState->ArgTypes, &WalkState->ArgCount);
} while (Op);
return_ACPI_STATUS (Status);
}
else if (ACPI_FAILURE (Status))
{
/* First error is most important */
(void) AcpiPsCompleteThisOp (WalkState, Op);
return_ACPI_STATUS (Status);
}
}
Status2 = AcpiPsCompleteThisOp (WalkState, Op);
if (ACPI_FAILURE (Status2))
{
return_ACPI_STATUS (Status2);
}
}
AcpiPsPopScope (&(WalkState->ParserState), &Op, &WalkState->ArgTypes,
&WalkState->ArgCount);
} while (Op);
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiPsParseLoop
*
* PARAMETERS: WalkState - Current state
*
* RETURN: Status
*
* DESCRIPTION: Parse AML (pointed to by the current parser state) and return
* a tree of ops.
*
******************************************************************************/
ACPI_STATUS
AcpiPsParseLoop (
ACPI_WALK_STATE *WalkState)
{
ACPI_STATUS Status = AE_OK;
ACPI_PARSE_OBJECT *Op = NULL; /* current op */
ACPI_PARSE_STATE *ParserState;
UINT8 *AmlOpStart = NULL;
ACPI_FUNCTION_TRACE_PTR (PsParseLoop, WalkState);
if (WalkState->DescendingCallback == NULL)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
ParserState = &WalkState->ParserState;
WalkState->ArgTypes = 0;
#if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
if (WalkState->WalkType & ACPI_WALK_METHOD_RESTART)
{
/* We are restarting a preempted control method */
if (AcpiPsHasCompletedScope (ParserState))
{
/*
* We must check if a predicate to an IF or WHILE statement
* was just completed
*/
if ((ParserState->Scope->ParseScope.Op) &&
((ParserState->Scope->ParseScope.Op->Common.AmlOpcode == AML_IF_OP) ||
(ParserState->Scope->ParseScope.Op->Common.AmlOpcode == AML_WHILE_OP)) &&
(WalkState->ControlState) &&
(WalkState->ControlState->Common.State ==
ACPI_CONTROL_PREDICATE_EXECUTING))
{
/*
* A predicate was just completed, get the value of the
* predicate and branch based on that value
*/
WalkState->Op = NULL;
Status = AcpiDsGetPredicateValue (WalkState, ACPI_TO_POINTER (TRUE));
if (ACPI_FAILURE (Status) &&
((Status & AE_CODE_MASK) != AE_CODE_CONTROL))
{
if (Status == AE_AML_NO_RETURN_VALUE)
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Invoked method did not return a value"));
}
ACPI_EXCEPTION ((AE_INFO, Status, "GetPredicate Failed"));
return_ACPI_STATUS (Status);
}
Status = AcpiPsNextParseState (WalkState, Op, Status);
}
AcpiPsPopScope (ParserState, &Op,
&WalkState->ArgTypes, &WalkState->ArgCount);
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", Op));
}
else if (WalkState->PrevOp)
{
/* We were in the middle of an op */
Op = WalkState->PrevOp;
WalkState->ArgTypes = WalkState->PrevArgTypes;
}
}
#endif
/* Iterative parsing loop, while there is more AML to process: */
while ((ParserState->Aml < ParserState->AmlEnd) || (Op))
{
AmlOpStart = ParserState->Aml;
if (!Op)
{
Status = AcpiPsCreateOp (WalkState, AmlOpStart, &Op);
if (ACPI_FAILURE (Status))
{
if (Status == AE_CTRL_PARSE_CONTINUE)
{
continue;
}
if (Status == AE_CTRL_PARSE_PENDING)
{
Status = AE_OK;
}
Status = AcpiPsCompleteOp (WalkState, &Op, Status);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
continue;
}
Op->Common.AmlOffset = WalkState->AmlOffset;
if (WalkState->OpInfo)
{
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
"Opcode %4.4X [%s] Op %p Aml %p AmlOffset %5.5X\n",
(UINT32) Op->Common.AmlOpcode, WalkState->OpInfo->Name,
Op, ParserState->Aml, Op->Common.AmlOffset));
}
}
/*
* Start ArgCount at zero because we don't know if there are
* any args yet
*/
WalkState->ArgCount = 0;
/* Are there any arguments that must be processed? */
if (WalkState->ArgTypes)
{
/* Get arguments */
Status = AcpiPsGetArguments (WalkState, AmlOpStart, Op);
if (ACPI_FAILURE (Status))
{
Status = AcpiPsCompleteOp (WalkState, &Op, Status);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
continue;
}
}
/* Check for arguments that need to be processed */
if (WalkState->ArgCount)
{
/*
* There are arguments (complex ones), push Op and
* prepare for argument
*/
Status = AcpiPsPushScope (ParserState, Op,
WalkState->ArgTypes, WalkState->ArgCount);
if (ACPI_FAILURE (Status))
{
Status = AcpiPsCompleteOp (WalkState, &Op, Status);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
continue;
}
Op = NULL;
continue;
}
/*
* All arguments have been processed -- Op is complete,
* prepare for next
*/
WalkState->OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
if (WalkState->OpInfo->Flags & AML_NAMED)
{
if (AcpiGbl_Depth)
{
AcpiGbl_Depth--;
}
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);
}