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436 lines
14 KiB
C
436 lines
14 KiB
C
/******************************************************************************
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*
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* Module Name: nspredef - Validation of ACPI predefined methods and objects
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2019, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#define ACPI_CREATE_PREDEFINED_TABLE
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#include "acpi.h"
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#include "accommon.h"
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#include "acnamesp.h"
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#include "acpredef.h"
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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME ("nspredef")
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/*******************************************************************************
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*
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* This module validates predefined ACPI objects that appear in the namespace,
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* at the time they are evaluated (via AcpiEvaluateObject). The purpose of this
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* validation is to detect problems with BIOS-exposed predefined ACPI objects
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* before the results are returned to the ACPI-related drivers.
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*
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* There are several areas that are validated:
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*
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* 1) The number of input arguments as defined by the method/object in the
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* ASL is validated against the ACPI specification.
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* 2) The type of the return object (if any) is validated against the ACPI
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* specification.
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* 3) For returned package objects, the count of package elements is
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* validated, as well as the type of each package element. Nested
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* packages are supported.
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*
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* For any problems found, a warning message is issued.
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*
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******************************************************************************/
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/* Local prototypes */
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static ACPI_STATUS
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AcpiNsCheckReference (
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ACPI_EVALUATE_INFO *Info,
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ACPI_OPERAND_OBJECT *ReturnObject);
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static UINT32
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AcpiNsGetBitmappedType (
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ACPI_OPERAND_OBJECT *ReturnObject);
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsCheckReturnValue
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*
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* PARAMETERS: Node - Namespace node for the method/object
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* Info - Method execution information block
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* UserParamCount - Number of parameters actually passed
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* ReturnStatus - Status from the object evaluation
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* ReturnObjectPtr - Pointer to the object returned from the
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* evaluation of a method or object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Check the value returned from a predefined name.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiNsCheckReturnValue (
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ACPI_NAMESPACE_NODE *Node,
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ACPI_EVALUATE_INFO *Info,
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UINT32 UserParamCount,
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ACPI_STATUS ReturnStatus,
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ACPI_OPERAND_OBJECT **ReturnObjectPtr)
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{
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ACPI_STATUS Status;
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const ACPI_PREDEFINED_INFO *Predefined;
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/* If not a predefined name, we cannot validate the return object */
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Predefined = Info->Predefined;
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if (!Predefined)
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{
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return (AE_OK);
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}
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/*
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* If the method failed or did not actually return an object, we cannot
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* validate the return object
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*/
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if ((ReturnStatus != AE_OK) &&
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(ReturnStatus != AE_CTRL_RETURN_VALUE))
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{
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return (AE_OK);
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}
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/*
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* Return value validation and possible repair.
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*
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* 1) Don't perform return value validation/repair if this feature
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* has been disabled via a global option.
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*
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* 2) We have a return value, but if one wasn't expected, just exit,
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* this is not a problem. For example, if the "Implicit Return"
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* feature is enabled, methods will always return a value.
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*
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* 3) If the return value can be of any type, then we cannot perform
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* any validation, just exit.
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*/
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if (AcpiGbl_DisableAutoRepair ||
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(!Predefined->Info.ExpectedBtypes) ||
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(Predefined->Info.ExpectedBtypes == ACPI_RTYPE_ALL))
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{
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return (AE_OK);
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}
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/*
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* Check that the type of the main return object is what is expected
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* for this predefined name
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*/
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Status = AcpiNsCheckObjectType (Info, ReturnObjectPtr,
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Predefined->Info.ExpectedBtypes, ACPI_NOT_PACKAGE_ELEMENT);
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if (ACPI_FAILURE (Status))
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{
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goto Exit;
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}
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/*
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*
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* 4) If there is no return value and it is optional, just return
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* AE_OK (_WAK).
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*/
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if (!(*ReturnObjectPtr))
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{
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goto Exit;
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}
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/*
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* For returned Package objects, check the type of all sub-objects.
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* Note: Package may have been newly created by call above.
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*/
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if ((*ReturnObjectPtr)->Common.Type == ACPI_TYPE_PACKAGE)
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{
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Info->ParentPackage = *ReturnObjectPtr;
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Status = AcpiNsCheckPackage (Info, ReturnObjectPtr);
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if (ACPI_FAILURE (Status))
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{
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/* We might be able to fix some errors */
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if ((Status != AE_AML_OPERAND_TYPE) &&
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(Status != AE_AML_OPERAND_VALUE))
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{
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goto Exit;
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}
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}
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}
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/*
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* The return object was OK, or it was successfully repaired above.
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* Now make some additional checks such as verifying that package
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* objects are sorted correctly (if required) or buffer objects have
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* the correct data width (bytes vs. dwords). These repairs are
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* performed on a per-name basis, i.e., the code is specific to
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* particular predefined names.
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*/
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Status = AcpiNsComplexRepairs (Info, Node, Status, ReturnObjectPtr);
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Exit:
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/*
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* If the object validation failed or if we successfully repaired one
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* or more objects, mark the parent node to suppress further warning
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* messages during the next evaluation of the same method/object.
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*/
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if (ACPI_FAILURE (Status) ||
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(Info->ReturnFlags & ACPI_OBJECT_REPAIRED))
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{
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Node->Flags |= ANOBJ_EVALUATED;
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}
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return (Status);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsCheckObjectType
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*
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* PARAMETERS: Info - Method execution information block
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* ReturnObjectPtr - Pointer to the object returned from the
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* evaluation of a method or object
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* ExpectedBtypes - Bitmap of expected return type(s)
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* PackageIndex - Index of object within parent package (if
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* applicable - ACPI_NOT_PACKAGE_ELEMENT
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* otherwise)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Check the type of the return object against the expected object
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* type(s). Use of Btype allows multiple expected object types.
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*
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******************************************************************************/
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ACPI_STATUS
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AcpiNsCheckObjectType (
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ACPI_EVALUATE_INFO *Info,
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ACPI_OPERAND_OBJECT **ReturnObjectPtr,
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UINT32 ExpectedBtypes,
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UINT32 PackageIndex)
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{
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ACPI_OPERAND_OBJECT *ReturnObject = *ReturnObjectPtr;
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ACPI_STATUS Status = AE_OK;
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char TypeBuffer[96]; /* Room for 10 types */
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/* A Namespace node should not get here, but make sure */
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if (ReturnObject &&
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ACPI_GET_DESCRIPTOR_TYPE (ReturnObject) == ACPI_DESC_TYPE_NAMED)
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{
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ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, Info->NodeFlags,
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"Invalid return type - Found a Namespace node [%4.4s] type %s",
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ReturnObject->Node.Name.Ascii,
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AcpiUtGetTypeName (ReturnObject->Node.Type)));
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return (AE_AML_OPERAND_TYPE);
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}
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/*
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* Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type.
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* The bitmapped type allows multiple possible return types.
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*
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* Note, the cases below must handle all of the possible types returned
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* from all of the predefined names (including elements of returned
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* packages)
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*/
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Info->ReturnBtype = AcpiNsGetBitmappedType (ReturnObject);
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if (Info->ReturnBtype == ACPI_RTYPE_ANY)
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{
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/* Not one of the supported objects, must be incorrect */
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goto TypeErrorExit;
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}
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/* For reference objects, check that the reference type is correct */
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if ((Info->ReturnBtype & ExpectedBtypes) == ACPI_RTYPE_REFERENCE)
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{
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Status = AcpiNsCheckReference (Info, ReturnObject);
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return (Status);
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}
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/* Attempt simple repair of the returned object if necessary */
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Status = AcpiNsSimpleRepair (Info, ExpectedBtypes,
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PackageIndex, ReturnObjectPtr);
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if (ACPI_SUCCESS (Status))
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{
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return (AE_OK); /* Successful repair */
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}
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TypeErrorExit:
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/* Create a string with all expected types for this predefined object */
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AcpiUtGetExpectedReturnTypes (TypeBuffer, ExpectedBtypes);
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if (!ReturnObject)
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{
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ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, Info->NodeFlags,
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"Expected return object of type %s",
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TypeBuffer));
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}
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else if (PackageIndex == ACPI_NOT_PACKAGE_ELEMENT)
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{
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ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, Info->NodeFlags,
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"Return type mismatch - found %s, expected %s",
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AcpiUtGetObjectTypeName (ReturnObject), TypeBuffer));
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}
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else
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{
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ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, Info->NodeFlags,
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"Return Package type mismatch at index %u - "
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"found %s, expected %s", PackageIndex,
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AcpiUtGetObjectTypeName (ReturnObject), TypeBuffer));
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}
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return (AE_AML_OPERAND_TYPE);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsCheckReference
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*
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* PARAMETERS: Info - Method execution information block
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* ReturnObject - Object returned from the evaluation of a
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* method or object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Check a returned reference object for the correct reference
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* type. The only reference type that can be returned from a
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* predefined method is a named reference. All others are invalid.
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*
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******************************************************************************/
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static ACPI_STATUS
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AcpiNsCheckReference (
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ACPI_EVALUATE_INFO *Info,
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ACPI_OPERAND_OBJECT *ReturnObject)
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{
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/*
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* Check the reference object for the correct reference type (opcode).
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* The only type of reference that can be converted to an ACPI_OBJECT is
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* a reference to a named object (reference class: NAME)
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*/
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if (ReturnObject->Reference.Class == ACPI_REFCLASS_NAME)
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{
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return (AE_OK);
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}
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ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, Info->NodeFlags,
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"Return type mismatch - unexpected reference object type [%s] %2.2X",
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AcpiUtGetReferenceName (ReturnObject),
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ReturnObject->Reference.Class));
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return (AE_AML_OPERAND_TYPE);
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}
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/*******************************************************************************
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*
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* FUNCTION: AcpiNsGetBitmappedType
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*
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* PARAMETERS: ReturnObject - Object returned from method/obj evaluation
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*
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* RETURN: Object return type. ACPI_RTYPE_ANY indicates that the object
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* type is not supported. ACPI_RTYPE_NONE indicates that no
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* object was returned (ReturnObject is NULL).
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*
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* DESCRIPTION: Convert object type into a bitmapped object return type.
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*
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******************************************************************************/
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static UINT32
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AcpiNsGetBitmappedType (
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ACPI_OPERAND_OBJECT *ReturnObject)
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{
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UINT32 ReturnBtype;
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if (!ReturnObject)
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{
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return (ACPI_RTYPE_NONE);
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}
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/* Map ACPI_OBJECT_TYPE to internal bitmapped type */
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switch (ReturnObject->Common.Type)
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{
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case ACPI_TYPE_INTEGER:
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ReturnBtype = ACPI_RTYPE_INTEGER;
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break;
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case ACPI_TYPE_BUFFER:
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ReturnBtype = ACPI_RTYPE_BUFFER;
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break;
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case ACPI_TYPE_STRING:
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ReturnBtype = ACPI_RTYPE_STRING;
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break;
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case ACPI_TYPE_PACKAGE:
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ReturnBtype = ACPI_RTYPE_PACKAGE;
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break;
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case ACPI_TYPE_LOCAL_REFERENCE:
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ReturnBtype = ACPI_RTYPE_REFERENCE;
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break;
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default:
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/* Not one of the supported objects, must be incorrect */
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ReturnBtype = ACPI_RTYPE_ANY;
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break;
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}
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return (ReturnBtype);
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}
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