blob: d885e5ae4e1245eee2ac8922b1e4126e923441aa [file] [log] [blame]
/******************************************************************************
*
* Module Name: nspredef - Validation of ACPI predefined methods and objects
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2015, 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 ACPI_CREATE_PREDEFINED_TABLE
#include <contrib/dev/acpica/include/acpi.h>
#include <contrib/dev/acpica/include/accommon.h>
#include <contrib/dev/acpica/include/acnamesp.h>
#include <contrib/dev/acpica/include/acpredef.h>
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME ("nspredef")
/*******************************************************************************
*
* This module validates predefined ACPI objects that appear in the namespace,
* at the time they are evaluated (via AcpiEvaluateObject). The purpose of this
* validation is to detect problems with BIOS-exposed predefined ACPI objects
* before the results are returned to the ACPI-related drivers.
*
* There are several areas that are validated:
*
* 1) The number of input arguments as defined by the method/object in the
* ASL is validated against the ACPI specification.
* 2) The type of the return object (if any) is validated against the ACPI
* specification.
* 3) For returned package objects, the count of package elements is
* validated, as well as the type of each package element. Nested
* packages are supported.
*
* For any problems found, a warning message is issued.
*
******************************************************************************/
/* Local prototypes */
static ACPI_STATUS
AcpiNsCheckReference (
ACPI_EVALUATE_INFO *Info,
ACPI_OPERAND_OBJECT *ReturnObject);
static UINT32
AcpiNsGetBitmappedType (
ACPI_OPERAND_OBJECT *ReturnObject);
/*******************************************************************************
*
* FUNCTION: AcpiNsCheckReturnValue
*
* PARAMETERS: Node - Namespace node for the method/object
* Info - Method execution information block
* UserParamCount - Number of parameters actually passed
* ReturnStatus - Status from the object evaluation
* ReturnObjectPtr - Pointer to the object returned from the
* evaluation of a method or object
*
* RETURN: Status
*
* DESCRIPTION: Check the value returned from a predefined name.
*
******************************************************************************/
ACPI_STATUS
AcpiNsCheckReturnValue (
ACPI_NAMESPACE_NODE *Node,
ACPI_EVALUATE_INFO *Info,
UINT32 UserParamCount,
ACPI_STATUS ReturnStatus,
ACPI_OPERAND_OBJECT **ReturnObjectPtr)
{
ACPI_STATUS Status;
const ACPI_PREDEFINED_INFO *Predefined;
/* If not a predefined name, we cannot validate the return object */
Predefined = Info->Predefined;
if (!Predefined)
{
return (AE_OK);
}
/*
* If the method failed or did not actually return an object, we cannot
* validate the return object
*/
if ((ReturnStatus != AE_OK) &&
(ReturnStatus != AE_CTRL_RETURN_VALUE))
{
return (AE_OK);
}
/*
* Return value validation and possible repair.
*
* 1) Don't perform return value validation/repair if this feature
* has been disabled via a global option.
*
* 2) We have a return value, but if one wasn't expected, just exit,
* this is not a problem. For example, if the "Implicit Return"
* feature is enabled, methods will always return a value.
*
* 3) If the return value can be of any type, then we cannot perform
* any validation, just exit.
*/
if (AcpiGbl_DisableAutoRepair ||
(!Predefined->Info.ExpectedBtypes) ||
(Predefined->Info.ExpectedBtypes == ACPI_RTYPE_ALL))
{
return (AE_OK);
}
/*
* Check that the type of the main return object is what is expected
* for this predefined name
*/
Status = AcpiNsCheckObjectType (Info, ReturnObjectPtr,
Predefined->Info.ExpectedBtypes, ACPI_NOT_PACKAGE_ELEMENT);
if (ACPI_FAILURE (Status))
{
goto Exit;
}
/*
*
* 4) If there is no return value and it is optional, just return
* AE_OK (_WAK).
*/
if (!(*ReturnObjectPtr))
{
goto Exit;
}
/*
* For returned Package objects, check the type of all sub-objects.
* Note: Package may have been newly created by call above.
*/
if ((*ReturnObjectPtr)->Common.Type == ACPI_TYPE_PACKAGE)
{
Info->ParentPackage = *ReturnObjectPtr;
Status = AcpiNsCheckPackage (Info, ReturnObjectPtr);
if (ACPI_FAILURE (Status))
{
/* We might be able to fix some errors */
if ((Status != AE_AML_OPERAND_TYPE) &&
(Status != AE_AML_OPERAND_VALUE))
{
goto Exit;
}
}
}
/*
* The return object was OK, or it was successfully repaired above.
* Now make some additional checks such as verifying that package
* objects are sorted correctly (if required) or buffer objects have
* the correct data width (bytes vs. dwords). These repairs are
* performed on a per-name basis, i.e., the code is specific to
* particular predefined names.
*/
Status = AcpiNsComplexRepairs (Info, Node, Status, ReturnObjectPtr);
Exit:
/*
* If the object validation failed or if we successfully repaired one
* or more objects, mark the parent node to suppress further warning
* messages during the next evaluation of the same method/object.
*/
if (ACPI_FAILURE (Status) ||
(Info->ReturnFlags & ACPI_OBJECT_REPAIRED))
{
Node->Flags |= ANOBJ_EVALUATED;
}
return (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsCheckObjectType
*
* PARAMETERS: Info - Method execution information block
* ReturnObjectPtr - Pointer to the object returned from the
* evaluation of a method or object
* ExpectedBtypes - Bitmap of expected return type(s)
* PackageIndex - Index of object within parent package (if
* applicable - ACPI_NOT_PACKAGE_ELEMENT
* otherwise)
*
* RETURN: Status
*
* DESCRIPTION: Check the type of the return object against the expected object
* type(s). Use of Btype allows multiple expected object types.
*
******************************************************************************/
ACPI_STATUS
AcpiNsCheckObjectType (
ACPI_EVALUATE_INFO *Info,
ACPI_OPERAND_OBJECT **ReturnObjectPtr,
UINT32 ExpectedBtypes,
UINT32 PackageIndex)
{
ACPI_OPERAND_OBJECT *ReturnObject = *ReturnObjectPtr;
ACPI_STATUS Status = AE_OK;
char TypeBuffer[48]; /* Room for 5 types */
/* A Namespace node should not get here, but make sure */
if (ReturnObject &&
ACPI_GET_DESCRIPTOR_TYPE (ReturnObject) == ACPI_DESC_TYPE_NAMED)
{
ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, Info->NodeFlags,
"Invalid return type - Found a Namespace node [%4.4s] type %s",
ReturnObject->Node.Name.Ascii,
AcpiUtGetTypeName (ReturnObject->Node.Type)));
return (AE_AML_OPERAND_TYPE);
}
/*
* Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type.
* The bitmapped type allows multiple possible return types.
*
* Note, the cases below must handle all of the possible types returned
* from all of the predefined names (including elements of returned
* packages)
*/
Info->ReturnBtype = AcpiNsGetBitmappedType (ReturnObject);
if (Info->ReturnBtype == ACPI_RTYPE_ANY)
{
/* Not one of the supported objects, must be incorrect */
goto TypeErrorExit;
}
/* For reference objects, check that the reference type is correct */
if ((Info->ReturnBtype & ExpectedBtypes) == ACPI_RTYPE_REFERENCE)
{
Status = AcpiNsCheckReference (Info, ReturnObject);
return (Status);
}
/* Attempt simple repair of the returned object if necessary */
Status = AcpiNsSimpleRepair (Info, ExpectedBtypes,
PackageIndex, ReturnObjectPtr);
if (ACPI_SUCCESS (Status))
{
return (AE_OK); /* Successful repair */
}
TypeErrorExit:
/* Create a string with all expected types for this predefined object */
AcpiUtGetExpectedReturnTypes (TypeBuffer, ExpectedBtypes);
if (!ReturnObject)
{
ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, Info->NodeFlags,
"Expected return object of type %s",
TypeBuffer));
}
else if (PackageIndex == ACPI_NOT_PACKAGE_ELEMENT)
{
ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, Info->NodeFlags,
"Return type mismatch - found %s, expected %s",
AcpiUtGetObjectTypeName (ReturnObject), TypeBuffer));
}
else
{
ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, Info->NodeFlags,
"Return Package type mismatch at index %u - "
"found %s, expected %s", PackageIndex,
AcpiUtGetObjectTypeName (ReturnObject), TypeBuffer));
}
return (AE_AML_OPERAND_TYPE);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsCheckReference
*
* PARAMETERS: Info - Method execution information block
* ReturnObject - Object returned from the evaluation of a
* method or object
*
* RETURN: Status
*
* DESCRIPTION: Check a returned reference object for the correct reference
* type. The only reference type that can be returned from a
* predefined method is a named reference. All others are invalid.
*
******************************************************************************/
static ACPI_STATUS
AcpiNsCheckReference (
ACPI_EVALUATE_INFO *Info,
ACPI_OPERAND_OBJECT *ReturnObject)
{
/*
* Check the reference object for the correct reference type (opcode).
* The only type of reference that can be converted to an ACPI_OBJECT is
* a reference to a named object (reference class: NAME)
*/
if (ReturnObject->Reference.Class == ACPI_REFCLASS_NAME)
{
return (AE_OK);
}
ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, Info->NodeFlags,
"Return type mismatch - unexpected reference object type [%s] %2.2X",
AcpiUtGetReferenceName (ReturnObject),
ReturnObject->Reference.Class));
return (AE_AML_OPERAND_TYPE);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsGetBitmappedType
*
* PARAMETERS: ReturnObject - Object returned from method/obj evaluation
*
* RETURN: Object return type. ACPI_RTYPE_ANY indicates that the object
* type is not supported. ACPI_RTYPE_NONE indicates that no
* object was returned (ReturnObject is NULL).
*
* DESCRIPTION: Convert object type into a bitmapped object return type.
*
******************************************************************************/
static UINT32
AcpiNsGetBitmappedType (
ACPI_OPERAND_OBJECT *ReturnObject)
{
UINT32 ReturnBtype;
if (!ReturnObject)
{
return (ACPI_RTYPE_NONE);
}
/* Map ACPI_OBJECT_TYPE to internal bitmapped type */
switch (ReturnObject->Common.Type)
{
case ACPI_TYPE_INTEGER:
ReturnBtype = ACPI_RTYPE_INTEGER;
break;
case ACPI_TYPE_BUFFER:
ReturnBtype = ACPI_RTYPE_BUFFER;
break;
case ACPI_TYPE_STRING:
ReturnBtype = ACPI_RTYPE_STRING;
break;
case ACPI_TYPE_PACKAGE:
ReturnBtype = ACPI_RTYPE_PACKAGE;
break;
case ACPI_TYPE_LOCAL_REFERENCE:
ReturnBtype = ACPI_RTYPE_REFERENCE;
break;
default:
/* Not one of the supported objects, must be incorrect */
ReturnBtype = ACPI_RTYPE_ANY;
break;
}
return (ReturnBtype);
}