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freebsd-dev/sys/contrib/dev/acpica/dsopcode.c

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/******************************************************************************
*
* Module Name: dsopcode - Dispatcher Op Region support and handling of
* "control" opcodes
* $Revision: 32 $
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp.
* All rights reserved.
*
* 2. License
*
* 2.1. This is your license from Intel Corp. under its intellectual property
* rights. You may have additional license terms from the party that provided
* you this software, covering your right to use that party's intellectual
* property rights.
*
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
* copy of the source code appearing in this file ("Covered Code") an
* irrevocable, perpetual, worldwide license under Intel's copyrights in the
* base code distributed originally by Intel ("Original Intel Code") to copy,
* make derivatives, distribute, use and display any portion of the Covered
* Code in any form, with the right to sublicense such rights; and
*
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
* license (with the right to sublicense), under only those claims of Intel
* patents that are infringed by the Original Intel Code, to make, use, sell,
* offer to sell, and import the Covered Code and derivative works thereof
* solely to the minimum extent necessary to exercise the above copyright
* license, and in no event shall the patent license extend to any additions
* to or modifications of the Original Intel Code. No other license or right
* is granted directly or by implication, estoppel or otherwise;
*
* The above copyright and patent license is granted only if the following
* conditions are met:
*
* 3. Conditions
*
* 3.1. Redistribution of Source with Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification with rights to further distribute source must include
* the above Copyright Notice, the above License, this list of Conditions,
* and the following Disclaimer and Export Compliance provision. In addition,
* Licensee must cause all Covered Code to which Licensee contributes to
* contain a file documenting the changes Licensee made to create that Covered
* Code and the date of any change. Licensee must include in that file the
* documentation of any changes made by any predecessor Licensee. Licensee
* must include a prominent statement that the modification is derived,
* directly or indirectly, from Original Intel Code.
*
* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification without rights to further distribute source must
* include the following Disclaimer and Export Compliance provision in the
* documentation and/or other materials provided with distribution. In
* addition, Licensee may not authorize further sublicense of source of any
* portion of the Covered Code, and must include terms to the effect that the
* license from Licensee to its licensee is limited to the intellectual
* property embodied in the software Licensee provides to its licensee, and
* not to intellectual property embodied in modifications its licensee may
* make.
*
* 3.3. Redistribution of Executable. Redistribution in executable form of any
* substantial portion of the Covered Code or modification must reproduce the
* above Copyright Notice, and the following Disclaimer and Export Compliance
* provision in the documentation and/or other materials provided with the
* distribution.
*
* 3.4. Intel retains all right, title, and interest in and to the Original
* Intel Code.
*
* 3.5. Neither the name Intel nor any other trademark owned or controlled by
* Intel shall be used in advertising or otherwise to promote the sale, use or
* other dealings in products derived from or relating to the Covered Code
* without prior written authorization from Intel.
*
* 4. Disclaimer and Export Compliance
*
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
* LIMITED REMEDY.
*
* 4.3. Licensee shall not export, either directly or indirectly, any of this
* software or system incorporating such software without first obtaining any
* required license or other approval from the U. S. Department of Commerce or
* any other agency or department of the United States Government. In the
* event Licensee exports any such software from the United States or
* re-exports any such software from a foreign destination, Licensee shall
* ensure that the distribution and export/re-export of the software is in
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* any of its subsidiaries will export/re-export any technical data, process,
* software, or service, directly or indirectly, to any country for which the
* United States government or any agency thereof requires an export license,
* other governmental approval, or letter of assurance, without first obtaining
* such license, approval or letter.
*
*****************************************************************************/
#define __DSOPCODE_C__
#include "acpi.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acevents.h"
#include "actables.h"
#define _COMPONENT DISPATCHER
MODULE_NAME ("dsopcode")
/*****************************************************************************
*
* FUNCTION: AcpiDsGetFieldUnitArguments
*
* PARAMETERS: ObjDesc - A valid FieldUnit object
*
* RETURN: Status.
*
* DESCRIPTION: Get FieldUnit Buffer and Index. This implements the late
* evaluation of these field attributes.
*
****************************************************************************/
ACPI_STATUS
AcpiDsGetFieldUnitArguments (
ACPI_OPERAND_OBJECT *ObjDesc)
{
ACPI_OPERAND_OBJECT *ExtraDesc;
ACPI_NAMESPACE_NODE *Node;
ACPI_PARSE_OBJECT *Op;
ACPI_PARSE_OBJECT *FieldOp;
ACPI_STATUS Status;
ACPI_TABLE_DESC *TableDesc;
FUNCTION_TRACE_PTR ("DsGetFieldUnitArguments", ObjDesc);
if (ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)
{
return_ACPI_STATUS (AE_OK);
}
/* Get the AML pointer (method object) and FieldUnit node */
ExtraDesc = ObjDesc->FieldUnit.Extra;
Node = ObjDesc->FieldUnit.Node;
DEBUG_EXEC(AcpiCmDisplayInitPathname (Node, " [Field]"));
DEBUG_PRINT (TRACE_EXEC,
("DsGetFieldUnitArguments: [%4.4s] FieldUnit JIT Init\n",
&Node->Name));
/*
* Allocate a new parser op to be the root of the parsed
* OpRegion tree
*/
Op = AcpiPsAllocOp (AML_SCOPE_OP);
if (!Op)
{
return (AE_NO_MEMORY);
}
/* Save the Node for use in AcpiPsParseAml */
Op->Node = AcpiNsGetParentObject (Node);
/* Get a handle to the parent ACPI table */
Status = AcpiTbHandleToObject (Node->OwnerId, &TableDesc);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Pass1: Parse the entire FieldUnit declaration */
Status = AcpiPsParseAml (Op, ExtraDesc->Extra.Pcode,
ExtraDesc->Extra.PcodeLength, 0,
NULL, NULL, NULL, AcpiDsLoad1BeginOp, AcpiDsLoad1EndOp);
if (ACPI_FAILURE (Status))
{
AcpiPsDeleteParseTree (Op);
return_ACPI_STATUS (Status);
}
/* Get and init the actual FielUnitOp created above */
FieldOp = Op->Value.Arg;
Op->Node = Node;
FieldOp = Op->Value.Arg;
FieldOp->Node = Node;
AcpiPsDeleteParseTree (Op);
/* AcpiEvaluate the address and length arguments for the OpRegion */
Op = AcpiPsAllocOp (AML_SCOPE_OP);
if (!Op)
{
return (AE_NO_MEMORY);
}
Op->Node = AcpiNsGetParentObject (Node);
Status = AcpiPsParseAml (Op, ExtraDesc->Extra.Pcode,
ExtraDesc->Extra.PcodeLength,
ACPI_PARSE_EXECUTE | ACPI_PARSE_DELETE_TREE,
NULL /*MethodDesc*/, NULL, NULL,
AcpiDsExecBeginOp, AcpiDsExecEndOp);
/* All done with the parse tree, delete it */
AcpiPsDeleteParseTree (Op);
/*
* The pseudo-method object is no longer needed since the region is
* now initialized
*/
AcpiCmRemoveReference (ObjDesc->FieldUnit.Extra);
ObjDesc->FieldUnit.Extra = NULL;
return_ACPI_STATUS (Status);
}
/*****************************************************************************
*
* FUNCTION: AcpiDsGetRegionArguments
*
* PARAMETERS: ObjDesc - A valid region object
*
* RETURN: Status.
*
* DESCRIPTION: Get region address and length. This implements the late
* evaluation of these region attributes.
*
****************************************************************************/
ACPI_STATUS
AcpiDsGetRegionArguments (
ACPI_OPERAND_OBJECT *ObjDesc)
{
ACPI_OPERAND_OBJECT *ExtraDesc = NULL;
ACPI_NAMESPACE_NODE *Node;
ACPI_PARSE_OBJECT *Op;
ACPI_PARSE_OBJECT *RegionOp;
ACPI_STATUS Status;
ACPI_TABLE_DESC *TableDesc;
FUNCTION_TRACE_PTR ("DsGetRegionArguments", ObjDesc);
if (ObjDesc->Region.Flags & AOPOBJ_DATA_VALID)
{
return_ACPI_STATUS (AE_OK);
}
/* Get the AML pointer (method object) and region node */
ExtraDesc = ObjDesc->Region.Extra;
Node = ObjDesc->Region.Node;
DEBUG_EXEC(AcpiCmDisplayInitPathname (Node, " [Operation Region]"));
DEBUG_PRINT (TRACE_EXEC,
("DsGetRegionArguments: [%4.4s] OpRegion Init at AML %p[%x]\n",
&Node->Name, ExtraDesc->Extra.Pcode, *(UINT32*) ExtraDesc->Extra.Pcode));
/*
* Allocate a new parser op to be the root of the parsed
* OpRegion tree
*/
Op = AcpiPsAllocOp (AML_SCOPE_OP);
if (!Op)
{
return (AE_NO_MEMORY);
}
/* Save the Node for use in AcpiPsParseAml */
Op->Node = AcpiNsGetParentObject (Node);
/* Get a handle to the parent ACPI table */
Status = AcpiTbHandleToObject (Node->OwnerId, &TableDesc);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Parse the entire OpRegion declaration, creating a parse tree */
Status = AcpiPsParseAml (Op, ExtraDesc->Extra.Pcode,
ExtraDesc->Extra.PcodeLength, 0,
NULL, NULL, NULL, AcpiDsLoad1BeginOp, AcpiDsLoad1EndOp);
if (ACPI_FAILURE (Status))
{
AcpiPsDeleteParseTree (Op);
return_ACPI_STATUS (Status);
}
/* Get and init the actual RegionOp created above */
RegionOp = Op->Value.Arg;
Op->Node = Node;
RegionOp = Op->Value.Arg;
RegionOp->Node = Node;
AcpiPsDeleteParseTree (Op);
/* AcpiEvaluate the address and length arguments for the OpRegion */
Op = AcpiPsAllocOp (AML_SCOPE_OP);
if (!Op)
{
return (AE_NO_MEMORY);
}
Op->Node = AcpiNsGetParentObject (Node);
Status = AcpiPsParseAml (Op, ExtraDesc->Extra.Pcode,
ExtraDesc->Extra.PcodeLength,
ACPI_PARSE_EXECUTE | ACPI_PARSE_DELETE_TREE,
NULL /*MethodDesc*/, NULL, NULL,
AcpiDsExecBeginOp, AcpiDsExecEndOp);
/* All done with the parse tree, delete it */
AcpiPsDeleteParseTree (Op);
return_ACPI_STATUS (Status);
}
/*****************************************************************************
*
* FUNCTION: AcpiDsInitializeRegion
*
* PARAMETERS: Op - A valid region Op object
*
* RETURN: Status
*
* DESCRIPTION:
*
****************************************************************************/
ACPI_STATUS
AcpiDsInitializeRegion (
ACPI_HANDLE ObjHandle)
{
ACPI_OPERAND_OBJECT *ObjDesc;
ACPI_STATUS Status;
ObjDesc = AcpiNsGetAttachedObject (ObjHandle);
/* Namespace is NOT locked */
Status = AcpiEvInitializeRegion (ObjDesc, FALSE);
return (Status);
}
/*****************************************************************************
*
* FUNCTION: AcpiDsEvalFieldUnitOperands
*
* PARAMETERS: Op - A valid FieldUnit Op object
*
* RETURN: Status
*
* DESCRIPTION: Get FieldUnit Buffer and Index
* Called from AcpiDsExecEndOp during FieldUnit parse tree walk
*
****************************************************************************/
ACPI_STATUS
AcpiDsEvalFieldUnitOperands (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT *Op)
{
ACPI_STATUS Status;
ACPI_OPERAND_OBJECT *FieldDesc;
ACPI_NAMESPACE_NODE *Node;
ACPI_PARSE_OBJECT *NextOp;
UINT32 Offset;
UINT32 BitOffset;
UINT16 BitCount;
ACPI_OPERAND_OBJECT *ResDesc = NULL;
ACPI_OPERAND_OBJECT *CntDesc = NULL;
ACPI_OPERAND_OBJECT *OffDesc = NULL;
ACPI_OPERAND_OBJECT *SrcDesc = NULL;
UINT32 NumOperands = 3;
FUNCTION_TRACE_PTR ("DsEvalFieldUnitOperands", Op);
/*
* This is where we evaluate the address and length fields of the OpFieldUnit declaration
*/
Node = Op->Node;
/* NextOp points to the op that holds the Buffer */
NextOp = Op->Value.Arg;
/* AcpiEvaluate/create the address and length operands */
Status = AcpiDsCreateOperands (WalkState, NextOp);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
FieldDesc = AcpiNsGetAttachedObject (Node);
if (!FieldDesc)
{
return_ACPI_STATUS (AE_NOT_EXIST);
}
/* Resolve the operands */
Status = AcpiAmlResolveOperands (Op->Opcode, WALK_OPERANDS, WalkState);
DUMP_OPERANDS (WALK_OPERANDS, IMODE_EXECUTE, AcpiPsGetOpcodeName (Op->Opcode),
NumOperands, "after AcpiAmlResolveOperands");
/* Get the operands */
Status |= AcpiDsObjStackPopObject (&ResDesc, WalkState);
if (AML_CREATE_FIELD_OP == Op->Opcode)
{
NumOperands = 4;
Status |= AcpiDsObjStackPopObject (&CntDesc, WalkState);
}
Status |= AcpiDsObjStackPopObject (&OffDesc, WalkState);
Status |= AcpiDsObjStackPopObject (&SrcDesc, WalkState);
if (ACPI_FAILURE (Status))
{
/* Invalid parameters on object stack */
DEBUG_PRINT (ACPI_ERROR,
("ExecCreateField/%s: bad operand(s) (%X)\n",
AcpiPsGetOpcodeName (Op->Opcode), Status));
goto Cleanup;
}
Offset = (UINT32) OffDesc->Integer.Value;
/*
* If ResDesc is a Name, it will be a direct name pointer after
* AcpiAmlResolveOperands()
*/
if (!VALID_DESCRIPTOR_TYPE (ResDesc, ACPI_DESC_TYPE_NAMED))
{
DEBUG_PRINT (ACPI_ERROR,
("AmlExecCreateField (%s): destination must be a Node\n",
AcpiPsGetOpcodeName (Op->Opcode)));
Status = AE_AML_OPERAND_TYPE;
goto Cleanup;
}
/*
* Setup the Bit offsets and counts, according to the opcode
*/
switch (Op->Opcode)
{
/* DefCreateBitField */
case AML_BIT_FIELD_OP:
/* Offset is in bits, Field is a bit */
BitOffset = Offset;
BitCount = 1;
break;
/* DefCreateByteField */
case AML_BYTE_FIELD_OP:
/* Offset is in bytes, field is a byte */
BitOffset = 8 * Offset;
BitCount = 8;
break;
/* DefCreateWordField */
case AML_WORD_FIELD_OP:
/* Offset is in bytes, field is a word */
BitOffset = 8 * Offset;
BitCount = 16;
break;
/* DefCreateDWordField */
case AML_DWORD_FIELD_OP:
/* Offset is in bytes, field is a dword */
BitOffset = 8 * Offset;
BitCount = 32;
break;
/* DefCreateField */
case AML_CREATE_FIELD_OP:
/* Offset is in bits, count is in bits */
BitOffset = Offset;
BitCount = (UINT16) CntDesc->Integer.Value;
break;
default:
DEBUG_PRINT (ACPI_ERROR,
("AmlExecCreateField: Internal error - unknown field creation opcode %02x\n",
Op->Opcode));
Status = AE_AML_BAD_OPCODE;
goto Cleanup;
}
/*
* Setup field according to the object type
*/
switch (SrcDesc->Common.Type)
{
/* SourceBuff := TermArg=>Buffer */
case ACPI_TYPE_BUFFER:
if (BitOffset + (UINT32) BitCount >
(8 * (UINT32) SrcDesc->Buffer.Length))
{
DEBUG_PRINT (ACPI_ERROR,
("AmlExecCreateField: Field exceeds Buffer %d > %d\n",
BitOffset + (UINT32) BitCount,
8 * (UINT32) SrcDesc->Buffer.Length));
Status = AE_AML_BUFFER_LIMIT;
goto Cleanup;
}
/* Construct the remainder of the field object */
FieldDesc->FieldUnit.Access = (UINT8) ACCESS_ANY_ACC;
FieldDesc->FieldUnit.LockRule = (UINT8) GLOCK_NEVER_LOCK;
FieldDesc->FieldUnit.UpdateRule = (UINT8) UPDATE_PRESERVE;
FieldDesc->FieldUnit.Length = BitCount;
FieldDesc->FieldUnit.BitOffset = (UINT8) (BitOffset % 8);
FieldDesc->FieldUnit.Offset = DIV_8 (BitOffset);
FieldDesc->FieldUnit.Container = SrcDesc;
/* Reference count for SrcDesc inherits FieldDesc count */
SrcDesc->Common.ReferenceCount = (UINT16) (SrcDesc->Common.ReferenceCount +
FieldDesc->Common.ReferenceCount);
break;
/* Improper object type */
default:
if ((SrcDesc->Common.Type > (UINT8) INTERNAL_TYPE_REFERENCE) ||
!AcpiCmValidObjectType (SrcDesc->Common.Type))
{
DEBUG_PRINT (ACPI_ERROR,
("AmlExecCreateField: Tried to create field in invalid object type %X\n",
SrcDesc->Common.Type));
}
else
{
DEBUG_PRINT (ACPI_ERROR,
("AmlExecCreateField: Tried to create field in improper object type - %s\n",
AcpiCmGetTypeName (SrcDesc->Common.Type)));
}
Status = AE_AML_OPERAND_TYPE;
goto Cleanup;
}
if (AML_CREATE_FIELD_OP == Op->Opcode)
{
/* Delete object descriptor unique to CreateField */
AcpiCmRemoveReference (CntDesc);
CntDesc = NULL;
}
Cleanup:
/* Always delete the operands */
AcpiCmRemoveReference (OffDesc);
AcpiCmRemoveReference (SrcDesc);
if (AML_CREATE_FIELD_OP == Op->Opcode)
{
AcpiCmRemoveReference (CntDesc);
}
/* On failure, delete the result descriptor */
if (ACPI_FAILURE (Status))
{
AcpiCmRemoveReference (ResDesc); /* Result descriptor */
}
else
{
/* Now the address and length are valid for this opFieldUnit */
FieldDesc->FieldUnit.Flags |= AOPOBJ_DATA_VALID;
}
return_ACPI_STATUS (Status);
}
/*****************************************************************************
*
* FUNCTION: AcpiDsEvalRegionOperands
*
* PARAMETERS: Op - A valid region Op object
*
* RETURN: Status
*
* DESCRIPTION: Get region address and length
* Called from AcpiDsExecEndOp during OpRegion parse tree walk
*
****************************************************************************/
ACPI_STATUS
AcpiDsEvalRegionOperands (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT *Op)
{
ACPI_STATUS Status;
ACPI_OPERAND_OBJECT *ObjDesc;
ACPI_OPERAND_OBJECT *OperandDesc;
ACPI_NAMESPACE_NODE *Node;
ACPI_PARSE_OBJECT *NextOp;
FUNCTION_TRACE_PTR ("DsEvalRegionOperands", Op);
/*
* This is where we evaluate the address and length fields of the OpRegion declaration
*/
Node = Op->Node;
/* NextOp points to the op that holds the SpaceID */
NextOp = Op->Value.Arg;
/* NextOp points to address op */
NextOp = NextOp->Next;
/* AcpiEvaluate/create the address and length operands */
Status = AcpiDsCreateOperands (WalkState, NextOp);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Resolve the length and address operands to numbers */
Status = AcpiAmlResolveOperands (Op->Opcode, WALK_OPERANDS, WalkState);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
DUMP_OPERANDS (WALK_OPERANDS, IMODE_EXECUTE,
AcpiPsGetOpcodeName (Op->Opcode),
1, "after AcpiAmlResolveOperands");
ObjDesc = AcpiNsGetAttachedObject (Node);
if (!ObjDesc)
{
return_ACPI_STATUS (AE_NOT_EXIST);
}
/*
* Get the length operand and save it
* (at Top of stack)
*/
OperandDesc = WalkState->Operands[WalkState->NumOperands - 1];
ObjDesc->Region.Length = (UINT32) OperandDesc->Integer.Value;
AcpiCmRemoveReference (OperandDesc);
/*
* Get the address and save it
* (at top of stack - 1)
*/
OperandDesc = WalkState->Operands[WalkState->NumOperands - 2];
ObjDesc->Region.Address = (ACPI_PHYSICAL_ADDRESS) OperandDesc->Integer.Value;
AcpiCmRemoveReference (OperandDesc);
DEBUG_PRINT (TRACE_EXEC,
("DsEvalRegionOperands: RgnObj %p Addr %X Len %X\n",
ObjDesc, ObjDesc->Region.Address, ObjDesc->Region.Length));
/* Now the address and length are valid for this opregion */
ObjDesc->Region.Flags |= AOPOBJ_DATA_VALID;
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiDsExecBeginControlOp
*
* PARAMETERS: WalkList - The list that owns the walk stack
* Op - The control Op
*
* RETURN: Status
*
* DESCRIPTION: Handles all control ops encountered during control method
* execution.
*
******************************************************************************/
ACPI_STATUS
AcpiDsExecBeginControlOp (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT *Op)
{
ACPI_STATUS Status = AE_OK;
ACPI_GENERIC_STATE *ControlState;
DEBUG_PRINT (TRACE_DISPATCH,
("BeginControlOp: Op=%p Opcode=%2.2X State=%p\n", Op,
Op->Opcode, WalkState));
switch (Op->Opcode)
{
case AML_IF_OP:
case AML_WHILE_OP:
/*
* IF/WHILE: Create a new control state to manage these
* constructs. We need to manage these as a stack, in order
* to handle nesting.
*/
ControlState = AcpiCmCreateControlState ();
if (!ControlState)
{
Status = AE_NO_MEMORY;
break;
}
AcpiCmPushGenericState (&WalkState->ControlState, ControlState);
/*
* Save a pointer to the predicate for multiple executions
* of a loop
*/
WalkState->ControlState->Control.AmlPredicateStart =
WalkState->ParserState->Aml - 1;
/* TBD: can this be removed? */
/*AcpiPsPkgLengthEncodingSize (GET8 (WalkState->ParserState->Aml));*/
break;
case AML_ELSE_OP:
/* Predicate is in the state object */
/* If predicate is true, the IF was executed, ignore ELSE part */
if (WalkState->LastPredicate)
{
Status = AE_CTRL_TRUE;
}
break;
case AML_RETURN_OP:
break;
default:
break;
}
return (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiDsExecEndControlOp
*
* PARAMETERS: WalkList - The list that owns the walk stack
* Op - The control Op
*
* RETURN: Status
*
* DESCRIPTION: Handles all control ops encountered during control method
* execution.
*
*
******************************************************************************/
ACPI_STATUS
AcpiDsExecEndControlOp (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT *Op)
{
ACPI_STATUS Status = AE_OK;
ACPI_GENERIC_STATE *ControlState;
switch (Op->Opcode)
{
case AML_IF_OP:
DEBUG_PRINT (TRACE_DISPATCH,
("EndControlOp: [IF_OP] Op=%p\n", Op));
/*
* Save the result of the predicate in case there is an
* ELSE to come
*/
WalkState->LastPredicate =
(BOOLEAN) WalkState->ControlState->Common.Value;
/*
* Pop the control state that was created at the start
* of the IF and free it
*/
ControlState =
AcpiCmPopGenericState (&WalkState->ControlState);
AcpiCmDeleteGenericState (ControlState);
break;
case AML_ELSE_OP:
break;
case AML_WHILE_OP:
DEBUG_PRINT (TRACE_DISPATCH,
("EndControlOp: [WHILE_OP] Op=%p\n", Op));
if (WalkState->ControlState->Common.Value)
{
/* Predicate was true, go back and evaluate it again! */
Status = AE_CTRL_PENDING;
}
DEBUG_PRINT (TRACE_DISPATCH,
("EndControlOp: [WHILE_OP] termination! Op=%p\n", Op));
/* Pop this control state and free it */
ControlState =
AcpiCmPopGenericState (&WalkState->ControlState);
WalkState->AmlLastWhile = ControlState->Control.AmlPredicateStart;
AcpiCmDeleteGenericState (ControlState);
break;
case AML_RETURN_OP:
DEBUG_PRINT (TRACE_DISPATCH,
("EndControlOp: [RETURN_OP] Op=%p Arg=%p\n",Op, Op->Value.Arg));
/*
* One optional operand -- the return value
* It can be either an immediate operand or a result that
* has been bubbled up the tree
*/
if (Op->Value.Arg)
{
/* Return statement has an immediate operand */
Status = AcpiDsCreateOperands (WalkState, Op->Value.Arg);
if (ACPI_FAILURE (Status))
{
return (Status);
}
/*
* If value being returned is a Reference (such as
* an arg or local), resolve it now because it may
* cease to exist at the end of the method.
*/
Status = AcpiAmlResolveToValue (&WalkState->Operands [0], WalkState);
if (ACPI_FAILURE (Status))
{
return (Status);
}
/*
* Get the return value and save as the last result
* value. This is the only place where WalkState->ReturnDesc
* is set to anything other than zero!
*/
WalkState->ReturnDesc = WalkState->Operands[0];
}
else if ((WalkState->Results) &&
(WalkState->Results->Results.NumResults > 0))
{
/*
* The return value has come from a previous calculation.
*
* If value being returned is a Reference (such as
* an arg or local), resolve it now because it may
* cease to exist at the end of the method.
*/
Status = AcpiAmlResolveToValue (&WalkState->Results->Results.ObjDesc [0], WalkState);
if (ACPI_FAILURE (Status))
{
return (Status);
}
WalkState->ReturnDesc = WalkState->Results->Results.ObjDesc [0];
}
else
{
/* No return operand */
if (WalkState->NumOperands)
{
AcpiCmRemoveReference (WalkState->Operands [0]);
}
WalkState->Operands [0] = NULL;
WalkState->NumOperands = 0;
WalkState->ReturnDesc = NULL;
}
DEBUG_PRINT (TRACE_DISPATCH,
("EndControlOp: Completed RETURN_OP State=%p, RetVal=%p\n",
WalkState, WalkState->ReturnDesc));
/* End the control method execution right now */
Status = AE_CTRL_TERMINATE;
break;
case AML_NOOP_OP:
/* Just do nothing! */
break;
case AML_BREAK_POINT_OP:
/* Call up to the OS dependent layer to handle this */
AcpiOsBreakpoint (NULL);
/* If it returns, we are done! */
break;
case AML_BREAK_OP:
DEBUG_PRINT (ACPI_INFO,
("EndControlOp: Break to end of current package, Op=%p\n", Op));
/*
* As per the ACPI specification:
* "The break operation causes the current package
* execution to complete"
* "Break -- Stop executing the current code package
* at this point"
*
* Returning AE_FALSE here will cause termination of
* the current package, and execution will continue one
* level up, starting with the completion of the parent Op.
*/
Status = AE_CTRL_FALSE;
break;
default:
DEBUG_PRINT (ACPI_ERROR,
("EndControlOp: Unknown control opcode=%X Op=%p\n",
Op->Opcode, Op));
Status = AE_AML_BAD_OPCODE;
break;
}
return (Status);
}
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