/******************************************************************************
*
* Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2018, 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.
*/
#include "acpi.h"
#include "accommon.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "actables.h"
#include "acdispat.h"
#include "acevents.h"
#include "amlcode.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exconfig")
/* Local prototypes */
static ACPI_STATUS
AcpiExAddTable (
UINT32 TableIndex,
ACPI_OPERAND_OBJECT **DdbHandle);
static ACPI_STATUS
AcpiExRegionRead (
ACPI_OPERAND_OBJECT *ObjDesc,
UINT32 Length,
UINT8 *Buffer);
/*******************************************************************************
*
* FUNCTION: AcpiExAddTable
*
* PARAMETERS: Table - Pointer to raw table
* ParentNode - Where to load the table (scope)
* DdbHandle - Where to return the table handle.
*
* RETURN: Status
*
* DESCRIPTION: Common function to Install and Load an ACPI table with a
* returned table handle.
*
******************************************************************************/
static ACPI_STATUS
AcpiExAddTable (
UINT32 TableIndex,
ACPI_OPERAND_OBJECT **DdbHandle)
{
ACPI_OPERAND_OBJECT *ObjDesc;
ACPI_FUNCTION_TRACE (ExAddTable);
/* Create an object to be the table handle */
ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE);
if (!ObjDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Init the table handle */
ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID;
ObjDesc->Reference.Class = ACPI_REFCLASS_TABLE;
ObjDesc->Reference.Value = TableIndex;
*DdbHandle = ObjDesc;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiExLoadTableOp
*
* PARAMETERS: WalkState - Current state with operands
* ReturnDesc - Where to store the return object
*
* RETURN: Status
*
* DESCRIPTION: Load an ACPI table from the RSDT/XSDT
*
******************************************************************************/
ACPI_STATUS
AcpiExLoadTableOp (
ACPI_WALK_STATE *WalkState,
ACPI_OPERAND_OBJECT **ReturnDesc)
{
ACPI_STATUS Status;
ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
ACPI_NAMESPACE_NODE *ParentNode;
ACPI_NAMESPACE_NODE *StartNode;
ACPI_NAMESPACE_NODE *ParameterNode = NULL;
ACPI_OPERAND_OBJECT *DdbHandle;
UINT32 TableIndex;
ACPI_FUNCTION_TRACE (ExLoadTableOp);
/* Find the ACPI table in the RSDT/XSDT */
AcpiExExitInterpreter ();
Status = AcpiTbFindTable (
Operand[0]->String.Pointer,
Operand[1]->String.Pointer,
Operand[2]->String.Pointer, &TableIndex);
AcpiExEnterInterpreter ();
if (ACPI_FAILURE (Status))
{
if (Status != AE_NOT_FOUND)
{
return_ACPI_STATUS (Status);
}
/* Table not found, return an Integer=0 and AE_OK */
DdbHandle = AcpiUtCreateIntegerObject ((UINT64) 0);
if (!DdbHandle)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
*ReturnDesc = DdbHandle;
return_ACPI_STATUS (AE_OK);
}
/* Default nodes */
StartNode = WalkState->ScopeInfo->Scope.Node;
ParentNode = AcpiGbl_RootNode;
/* RootPath (optional parameter) */
if (Operand[3]->String.Length > 0)
{
/*
* Find the node referenced by the RootPathString. This is the
* location within the namespace where the table will be loaded.
*/
Status = AcpiNsGetNodeUnlocked (StartNode,
Operand[3]->String.Pointer, ACPI_NS_SEARCH_PARENT,
&ParentNode);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
/* ParameterPath (optional parameter) */
if (Operand[4]->String.Length > 0)
{
if ((Operand[4]->String.Pointer[0] != AML_ROOT_PREFIX) &&
(Operand[4]->String.Pointer[0] != AML_PARENT_PREFIX))
{
/*
* Path is not absolute, so it will be relative to the node
* referenced by the RootPathString (or the NS root if omitted)
*/
StartNode = ParentNode;
}
/* Find the node referenced by the ParameterPathString */
Status = AcpiNsGetNodeUnlocked (StartNode,
Operand[4]->String.Pointer, ACPI_NS_SEARCH_PARENT,
&ParameterNode);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
/* Load the table into the namespace */
ACPI_INFO (("Dynamic OEM Table Load:"));
AcpiExExitInterpreter ();
Status = AcpiTbLoadTable (TableIndex, ParentNode);
AcpiExEnterInterpreter ();
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
Status = AcpiExAddTable (TableIndex, &DdbHandle);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Complete the initialization/resolution of package objects */
Status = AcpiNsWalkNamespace (ACPI_TYPE_PACKAGE, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX, 0, AcpiNsInitOnePackage, NULL, NULL, NULL);
/* Parameter Data (optional) */
if (ParameterNode)
{
/* Store the parameter data into the optional parameter object */
Status = AcpiExStore (Operand[5],
ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, ParameterNode), WalkState);
if (ACPI_FAILURE (Status))
{
(void) AcpiExUnloadTable (DdbHandle);
AcpiUtRemoveReference (DdbHandle);
return_ACPI_STATUS (Status);
}
}
*ReturnDesc = DdbHandle;
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiExRegionRead
*
* PARAMETERS: ObjDesc - Region descriptor
* Length - Number of bytes to read
* Buffer - Pointer to where to put the data
*
* RETURN: Status
*
* DESCRIPTION: Read data from an operation region. The read starts from the
* beginning of the region.
*
******************************************************************************/
static ACPI_STATUS
AcpiExRegionRead (
ACPI_OPERAND_OBJECT *ObjDesc,
UINT32 Length,
UINT8 *Buffer)
{
ACPI_STATUS Status;
UINT64 Value;
UINT32 RegionOffset = 0;
UINT32 i;
/* Bytewise reads */
for (i = 0; i < Length; i++)
{
Status = AcpiEvAddressSpaceDispatch (ObjDesc, NULL, ACPI_READ,
RegionOffset, 8, &Value);
if (ACPI_FAILURE (Status))
{
return (Status);
}
*Buffer = (UINT8) Value;
Buffer++;
RegionOffset++;
}
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiExLoadOp
*
* PARAMETERS: ObjDesc - Region or Buffer/Field where the table will be
* obtained
* Target - Where a handle to the table will be stored
* WalkState - Current state
*
* RETURN: Status
*
* DESCRIPTION: Load an ACPI table from a field or operation region
*
* NOTE: Region Fields (Field, BankField, IndexFields) are resolved to buffer
* objects before this code is reached.
*
* If source is an operation region, it must refer to SystemMemory, as
* per the ACPI specification.
*
******************************************************************************/
ACPI_STATUS
AcpiExLoadOp (
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT *Target,
ACPI_WALK_STATE *WalkState)
{
ACPI_OPERAND_OBJECT *DdbHandle;
ACPI_TABLE_HEADER *TableHeader;
ACPI_TABLE_HEADER *Table;
UINT32 TableIndex;
ACPI_STATUS Status;
UINT32 Length;
ACPI_FUNCTION_TRACE (ExLoadOp);
/* Source Object can be either an OpRegion or a Buffer/Field */
switch (ObjDesc->Common.Type)
{
case ACPI_TYPE_REGION:
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Load table from Region %p\n", ObjDesc));
/* Region must be SystemMemory (from ACPI spec) */
if (ObjDesc->Region.SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY)
{
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
/*
* If the Region Address and Length have not been previously
* evaluated, evaluate them now and save the results.
*/
if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
{
Status = AcpiDsGetRegionArguments (ObjDesc);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
/* Get the table header first so we can get the table length */
TableHeader = ACPI_ALLOCATE (sizeof (ACPI_TABLE_HEADER));
if (!TableHeader)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
Status = AcpiExRegionRead (ObjDesc, sizeof (ACPI_TABLE_HEADER),
ACPI_CAST_PTR (UINT8, TableHeader));
Length = TableHeader->Length;
ACPI_FREE (TableHeader);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Must have at least an ACPI table header */
if (Length < sizeof (ACPI_TABLE_HEADER))
{
return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
}
/*
* The original implementation simply mapped the table, with no copy.
* However, the memory region is not guaranteed to remain stable and
* we must copy the table to a local buffer. For example, the memory
* region is corrupted after suspend on some machines. Dynamically
* loaded tables are usually small, so this overhead is minimal.
*
* The latest implementation (5/2009) does not use a mapping at all.
* We use the low-level operation region interface to read the table
* instead of the obvious optimization of using a direct mapping.
* This maintains a consistent use of operation regions across the
* entire subsystem. This is important if additional processing must
* be performed in the (possibly user-installed) operation region
* handler. For example, AcpiExec and ASLTS depend on this.
*/
/* Allocate a buffer for the table */
Table = ACPI_ALLOCATE (Length);
if (!Table)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Read the entire table */
Status = AcpiExRegionRead (ObjDesc, Length,
ACPI_CAST_PTR (UINT8, Table));
if (ACPI_FAILURE (Status))
{
ACPI_FREE (Table);
return_ACPI_STATUS (Status);
}
break;
case ACPI_TYPE_BUFFER: /* Buffer or resolved RegionField */
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Load table from Buffer or Field %p\n", ObjDesc));
/* Must have at least an ACPI table header */
if (ObjDesc->Buffer.Length < sizeof (ACPI_TABLE_HEADER))
{
return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
}
/* Get the actual table length from the table header */
TableHeader = ACPI_CAST_PTR (
ACPI_TABLE_HEADER, ObjDesc->Buffer.Pointer);
Length = TableHeader->Length;
/* Table cannot extend beyond the buffer */
if (Length > ObjDesc->Buffer.Length)
{
return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
}
if (Length < sizeof (ACPI_TABLE_HEADER))
{
return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
}
/*
* Copy the table from the buffer because the buffer could be
* modified or even deleted in the future
*/
Table = ACPI_ALLOCATE (Length);
if (!Table)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
memcpy (Table, TableHeader, Length);
break;
default:
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
/* Install the new table into the local data structures */
ACPI_INFO (("Dynamic OEM Table Load:"));
AcpiExExitInterpreter ();
Status = AcpiTbInstallAndLoadTable (ACPI_PTR_TO_PHYSADDR (Table),
ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, TRUE, &TableIndex);
AcpiExEnterInterpreter ();
if (ACPI_FAILURE (Status))
{
/* Delete allocated table buffer */
ACPI_FREE (Table);
return_ACPI_STATUS (Status);
}
/*
* Add the table to the namespace.
*
* Note: Load the table objects relative to the root of the namespace.
* This appears to go against the ACPI specification, but we do it for
* compatibility with other ACPI implementations.
*/
Status = AcpiExAddTable (TableIndex, &DdbHandle);
if (ACPI_FAILURE (Status))
{
/* On error, TablePtr was deallocated above */
return_ACPI_STATUS (Status);
}
/* Complete the initialization/resolution of package objects */
Status = AcpiNsWalkNamespace (ACPI_TYPE_PACKAGE, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX, 0, AcpiNsInitOnePackage, NULL, NULL, NULL);
/* Store the DdbHandle into the Target operand */
Status = AcpiExStore (DdbHandle, Target, WalkState);
if (ACPI_FAILURE (Status))
{
(void) AcpiExUnloadTable (DdbHandle);
/* TablePtr was deallocated above */
AcpiUtRemoveReference (DdbHandle);
return_ACPI_STATUS (Status);
}
/* Remove the reference by added by AcpiExStore above */
AcpiUtRemoveReference (DdbHandle);
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiExUnloadTable
*
* PARAMETERS: DdbHandle - Handle to a previously loaded table
*
* RETURN: Status
*
* DESCRIPTION: Unload an ACPI table
*
******************************************************************************/
ACPI_STATUS
AcpiExUnloadTable (
ACPI_OPERAND_OBJECT *DdbHandle)
{
ACPI_STATUS Status = AE_OK;
ACPI_OPERAND_OBJECT *TableDesc = DdbHandle;
UINT32 TableIndex;
ACPI_FUNCTION_TRACE (ExUnloadTable);
/*
* Temporarily emit a warning so that the ASL for the machine can be
* hopefully obtained. This is to say that the Unload() operator is
* extremely rare if not completely unused.
*/
ACPI_WARNING ((AE_INFO,
"Received request to unload an ACPI table"));
/*
* May 2018: Unload is no longer supported for the following reasons:
* 1) A correct implementation on some hosts may not be possible.
* 2) Other ACPI implementations do not correctly/fully support it.
* 3) It requires host device driver support which does not exist.
* (To properly support namespace unload out from underneath.)
* 4) This AML operator has never been seen in the field.
*/
ACPI_EXCEPTION ((AE_INFO, AE_NOT_IMPLEMENTED,
"AML Unload operator is not supported"));
/*
* Validate the handle
* Although the handle is partially validated in AcpiExReconfiguration()
* when it calls AcpiExResolveOperands(), the handle is more completely
* validated here.
*
* Handle must be a valid operand object of type reference. Also, the
* DdbHandle must still be marked valid (table has not been previously
* unloaded)
*/
if ((!DdbHandle) ||
(ACPI_GET_DESCRIPTOR_TYPE (DdbHandle) != ACPI_DESC_TYPE_OPERAND) ||
(DdbHandle->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) ||
(!(DdbHandle->Common.Flags & AOPOBJ_DATA_VALID)))
{
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
/* Get the table index from the DdbHandle */
TableIndex = TableDesc->Reference.Value;
/*
* Release the interpreter lock so that the table lock won't have
* strict order requirement against it.
*/
AcpiExExitInterpreter ();
Status = AcpiTbUnloadTable (TableIndex);
AcpiExEnterInterpreter ();
/*
* Invalidate the handle. We do this because the handle may be stored
* in a named object and may not be actually deleted until much later.
*/
if (ACPI_SUCCESS (Status))
{
DdbHandle->Common.Flags &= ~AOPOBJ_DATA_VALID;
}
return_ACPI_STATUS (Status);
}