ACPI_STATUS
AcpiDsExecBeginControlOp (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT *Op)
{
ACPI_STATUS Status = AE_OK;
ACPI_GENERIC_STATE *ControlState;
ACPI_FUNCTION_NAME (DsExecBeginControlOp);
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n",
Op, Op->Common.AmlOpcode, WalkState));
switch (Op->Common.AmlOpcode)
{
case AML_WHILE_OP:
/*
* If this is an additional iteration of a while loop, continue.
* There is no need to allocate a new control state.
*/
if (WalkState->ControlState)
{
if (WalkState->ControlState->Control.AmlPredicateStart ==
(WalkState->ParserState.Aml - 1))
{
/* Reset the state to start-of-loop */
WalkState->ControlState->Common.State =
ACPI_CONTROL_CONDITIONAL_EXECUTING;
break;
}
}
/*lint -fallthrough */
case AML_IF_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 = AcpiUtCreateControlState ();
if (!ControlState)
{
Status = AE_NO_MEMORY;
break;
}
/*
* Save a pointer to the predicate for multiple executions
* of a loop
*/
ControlState->Control.AmlPredicateStart =
WalkState->ParserState.Aml - 1;
ControlState->Control.PackageEnd =
WalkState->ParserState.PkgEnd;
ControlState->Control.Opcode =
Op->Common.AmlOpcode;
ControlState->Control.LoopTimeout = AcpiOsGetTimer () +
(UINT64) (AcpiGbl_MaxLoopIterations * ACPI_100NSEC_PER_SEC);
/* Push the control state on this walk's control stack */
AcpiUtPushGenericState (&WalkState->ControlState, ControlState);
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);
}
ACPI_STATUS
AcpiDsExecBeginControlOp (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT *Op)
{
ACPI_STATUS Status = AE_OK;
ACPI_GENERIC_STATE *ControlState;
ACPI_FUNCTION_NAME (DsExecBeginControlOp);
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", Op,
Op->Common.AmlOpcode, WalkState));
switch (Op->Common.AmlOpcode)
{
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 = AcpiUtCreateControlState ();
if (!ControlState)
{
Status = AE_NO_MEMORY;
break;
}
/*
* Save a pointer to the predicate for multiple executions
* of a loop
*/
ControlState->Control.AmlPredicateStart = WalkState->ParserState.Aml - 1;
ControlState->Control.PackageEnd = WalkState->ParserState.PkgEnd;
ControlState->Control.Opcode = Op->Common.AmlOpcode;
/* Push the control state on this walk's control stack */
AcpiUtPushGenericState (&WalkState->ControlState, ControlState);
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);
}