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"));
/*
* 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);
}
ACPI_STATUS
AcpiUnloadParentTable (
ACPI_HANDLE Object)
{
ACPI_NAMESPACE_NODE *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Object);
ACPI_STATUS Status = AE_NOT_EXIST;
ACPI_OWNER_ID OwnerId;
UINT32 i;
ACPI_FUNCTION_TRACE (AcpiUnloadParentTable);
/* Parameter validation */
if (!Object)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/*
* The node OwnerId is currently the same as the parent table ID.
* However, this could change in the future.
*/
OwnerId = Node->OwnerId;
if (!OwnerId)
{
/* OwnerId==0 means DSDT is the owner. DSDT cannot be unloaded */
return_ACPI_STATUS (AE_TYPE);
}
/* Must acquire the table lock during this operation */
Status = AcpiUtAcquireMutex (ACPI_MTX_TABLES);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Find the table in the global table list */
for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++)
{
if (OwnerId != AcpiGbl_RootTableList.Tables[i].OwnerId)
{
continue;
}
/*
* Allow unload of SSDT and OEMx tables only. Do not allow unload
* of the DSDT. No other types of tables should get here, since
* only these types can contain AML and thus are the only types
* that can create namespace objects.
*/
if (ACPI_COMPARE_NAME (
AcpiGbl_RootTableList.Tables[i].Signature.Ascii,
ACPI_SIG_DSDT))
{
Status = AE_TYPE;
break;
}
(void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
Status = AcpiTbUnloadTable (i);
(void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
break;
}
(void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
return_ACPI_STATUS (Status);
}
