/****************************************************************************** * * Module Name: exresolv - AML Interpreter object resolution * *****************************************************************************/ /* * 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. */ #include #include #include #include #include #include #define _COMPONENT ACPI_EXECUTER ACPI_MODULE_NAME ("exresolv") /* Local prototypes */ static ACPI_STATUS AcpiExResolveObjectToValue ( ACPI_OPERAND_OBJECT **StackPtr, ACPI_WALK_STATE *WalkState); /******************************************************************************* * * FUNCTION: AcpiExResolveToValue * * PARAMETERS: **StackPtr - Points to entry on ObjStack, which can * be either an (ACPI_OPERAND_OBJECT *) * or an ACPI_HANDLE. * WalkState - Current method state * * RETURN: Status * * DESCRIPTION: Convert Reference objects to values * ******************************************************************************/ ACPI_STATUS AcpiExResolveToValue ( ACPI_OPERAND_OBJECT **StackPtr, ACPI_WALK_STATE *WalkState) { ACPI_STATUS Status; ACPI_FUNCTION_TRACE_PTR (ExResolveToValue, StackPtr); if (!StackPtr || !*StackPtr) { ACPI_ERROR ((AE_INFO, "Internal - null pointer")); return_ACPI_STATUS (AE_AML_NO_OPERAND); } /* * The entity pointed to by the StackPtr can be either * 1) A valid ACPI_OPERAND_OBJECT, or * 2) A ACPI_NAMESPACE_NODE (NamedObj) */ if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_OPERAND) { Status = AcpiExResolveObjectToValue (StackPtr, WalkState); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } if (!*StackPtr) { ACPI_ERROR ((AE_INFO, "Internal - null pointer")); return_ACPI_STATUS (AE_AML_NO_OPERAND); } } /* * Object on the stack may have changed if AcpiExResolveObjectToValue() * was called (i.e., we can't use an _else_ here.) */ if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_NAMED) { Status = AcpiExResolveNodeToValue ( ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, StackPtr), WalkState); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } } ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Resolved object %p\n", *StackPtr)); return_ACPI_STATUS (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiExResolveObjectToValue * * PARAMETERS: StackPtr - Pointer to an internal object * WalkState - Current method state * * RETURN: Status * * DESCRIPTION: Retrieve the value from an internal object. The Reference type * uses the associated AML opcode to determine the value. * ******************************************************************************/ static ACPI_STATUS AcpiExResolveObjectToValue ( ACPI_OPERAND_OBJECT **StackPtr, ACPI_WALK_STATE *WalkState) { ACPI_STATUS Status = AE_OK; ACPI_OPERAND_OBJECT *StackDesc; ACPI_OPERAND_OBJECT *ObjDesc = NULL; UINT8 RefType; ACPI_FUNCTION_TRACE (ExResolveObjectToValue); StackDesc = *StackPtr; /* This is an object of type ACPI_OPERAND_OBJECT */ switch (StackDesc->Common.Type) { case ACPI_TYPE_LOCAL_REFERENCE: RefType = StackDesc->Reference.Class; switch (RefType) { case ACPI_REFCLASS_LOCAL: case ACPI_REFCLASS_ARG: /* * Get the local from the method's state info * Note: this increments the local's object reference count */ Status = AcpiDsMethodDataGetValue (RefType, StackDesc->Reference.Value, WalkState, &ObjDesc); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Arg/Local %X] ValueObj is %p\n", StackDesc->Reference.Value, ObjDesc)); /* * Now we can delete the original Reference Object and * replace it with the resolved value */ AcpiUtRemoveReference (StackDesc); *StackPtr = ObjDesc; break; case ACPI_REFCLASS_INDEX: switch (StackDesc->Reference.TargetType) { case ACPI_TYPE_BUFFER_FIELD: /* Just return - do not dereference */ break; case ACPI_TYPE_PACKAGE: /* If method call or CopyObject - do not dereference */ if ((WalkState->Opcode == AML_INT_METHODCALL_OP) || (WalkState->Opcode == AML_COPY_OP)) { break; } /* Otherwise, dereference the PackageIndex to a package element */ ObjDesc = *StackDesc->Reference.Where; if (ObjDesc) { /* * Valid object descriptor, copy pointer to return value * (i.e., dereference the package index) * Delete the ref object, increment the returned object */ AcpiUtRemoveReference (StackDesc); AcpiUtAddReference (ObjDesc); *StackPtr = ObjDesc; } else { /* * A NULL object descriptor means an uninitialized element of * the package, can't dereference it */ ACPI_ERROR ((AE_INFO, "Attempt to dereference an Index to NULL package element Idx=%p", StackDesc)); Status = AE_AML_UNINITIALIZED_ELEMENT; } break; default: /* Invalid reference object */ ACPI_ERROR ((AE_INFO, "Unknown TargetType 0x%X in Index/Reference object %p", StackDesc->Reference.TargetType, StackDesc)); Status = AE_AML_INTERNAL; break; } break; case ACPI_REFCLASS_REFOF: case ACPI_REFCLASS_DEBUG: case ACPI_REFCLASS_TABLE: /* Just leave the object as-is, do not dereference */ break; case ACPI_REFCLASS_NAME: /* Reference to a named object */ /* Dereference the name */ if ((StackDesc->Reference.Node->Type == ACPI_TYPE_DEVICE) || (StackDesc->Reference.Node->Type == ACPI_TYPE_THERMAL)) { /* These node types do not have 'real' subobjects */ *StackPtr = (void *) StackDesc->Reference.Node; } else { /* Get the object pointed to by the namespace node */ *StackPtr = (StackDesc->Reference.Node)->Object; AcpiUtAddReference (*StackPtr); } AcpiUtRemoveReference (StackDesc); break; default: ACPI_ERROR ((AE_INFO, "Unknown Reference type 0x%X in %p", RefType, StackDesc)); Status = AE_AML_INTERNAL; break; } break; case ACPI_TYPE_BUFFER: Status = AcpiDsGetBufferArguments (StackDesc); break; case ACPI_TYPE_PACKAGE: Status = AcpiDsGetPackageArguments (StackDesc); break; case ACPI_TYPE_BUFFER_FIELD: case ACPI_TYPE_LOCAL_REGION_FIELD: case ACPI_TYPE_LOCAL_BANK_FIELD: case ACPI_TYPE_LOCAL_INDEX_FIELD: ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "FieldRead SourceDesc=%p Type=%X\n", StackDesc, StackDesc->Common.Type)); Status = AcpiExReadDataFromField (WalkState, StackDesc, &ObjDesc); /* Remove a reference to the original operand, then override */ AcpiUtRemoveReference (*StackPtr); *StackPtr = (void *) ObjDesc; break; default: break; } return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiExResolveMultiple * * PARAMETERS: WalkState - Current state (contains AML opcode) * Operand - Starting point for resolution * ReturnType - Where the object type is returned * ReturnDesc - Where the resolved object is returned * * RETURN: Status * * DESCRIPTION: Return the base object and type. Traverse a reference list if * necessary to get to the base object. * ******************************************************************************/ ACPI_STATUS AcpiExResolveMultiple ( ACPI_WALK_STATE *WalkState, ACPI_OPERAND_OBJECT *Operand, ACPI_OBJECT_TYPE *ReturnType, ACPI_OPERAND_OBJECT **ReturnDesc) { ACPI_OPERAND_OBJECT *ObjDesc = ACPI_CAST_PTR (void, Operand); ACPI_NAMESPACE_NODE *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Operand); ACPI_OBJECT_TYPE Type; ACPI_STATUS Status; ACPI_FUNCTION_TRACE (AcpiExResolveMultiple); /* Operand can be either a namespace node or an operand descriptor */ switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc)) { case ACPI_DESC_TYPE_OPERAND: Type = ObjDesc->Common.Type; break; case ACPI_DESC_TYPE_NAMED: Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type; ObjDesc = AcpiNsGetAttachedObject (Node); /* If we had an Alias node, use the attached object for type info */ if (Type == ACPI_TYPE_LOCAL_ALIAS) { Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type; ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc); } if (!ObjDesc) { ACPI_ERROR ((AE_INFO, "[%4.4s] Node is unresolved or uninitialized", AcpiUtGetNodeName (Node))); return_ACPI_STATUS (AE_AML_UNINITIALIZED_NODE); } break; default: return_ACPI_STATUS (AE_AML_OPERAND_TYPE); } /* If type is anything other than a reference, we are done */ if (Type != ACPI_TYPE_LOCAL_REFERENCE) { goto Exit; } /* * For reference objects created via the RefOf, Index, or Load/LoadTable * operators, we need to get to the base object (as per the ACPI * specification of the ObjectType and SizeOf operators). This means * traversing the list of possibly many nested references. */ while (ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) { switch (ObjDesc->Reference.Class) { case ACPI_REFCLASS_REFOF: case ACPI_REFCLASS_NAME: /* Dereference the reference pointer */ if (ObjDesc->Reference.Class == ACPI_REFCLASS_REFOF) { Node = ObjDesc->Reference.Object; } else /* AML_INT_NAMEPATH_OP */ { Node = ObjDesc->Reference.Node; } /* All "References" point to a NS node */ if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED) { ACPI_ERROR ((AE_INFO, "Not a namespace node %p [%s]", Node, AcpiUtGetDescriptorName (Node))); return_ACPI_STATUS (AE_AML_INTERNAL); } /* Get the attached object */ ObjDesc = AcpiNsGetAttachedObject (Node); if (!ObjDesc) { /* No object, use the NS node type */ Type = AcpiNsGetType (Node); goto Exit; } /* Check for circular references */ if (ObjDesc == Operand) { return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE); } break; case ACPI_REFCLASS_INDEX: /* Get the type of this reference (index into another object) */ Type = ObjDesc->Reference.TargetType; if (Type != ACPI_TYPE_PACKAGE) { goto Exit; } /* * The main object is a package, we want to get the type * of the individual package element that is referenced by * the index. * * This could of course in turn be another reference object. */ ObjDesc = *(ObjDesc->Reference.Where); if (!ObjDesc) { /* NULL package elements are allowed */ Type = 0; /* Uninitialized */ goto Exit; } break; case ACPI_REFCLASS_TABLE: Type = ACPI_TYPE_DDB_HANDLE; goto Exit; case ACPI_REFCLASS_LOCAL: case ACPI_REFCLASS_ARG: if (ReturnDesc) { Status = AcpiDsMethodDataGetValue (ObjDesc->Reference.Class, ObjDesc->Reference.Value, WalkState, &ObjDesc); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } AcpiUtRemoveReference (ObjDesc); } else { Status = AcpiDsMethodDataGetNode (ObjDesc->Reference.Class, ObjDesc->Reference.Value, WalkState, &Node); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } ObjDesc = AcpiNsGetAttachedObject (Node); if (!ObjDesc) { Type = ACPI_TYPE_ANY; goto Exit; } } break; case ACPI_REFCLASS_DEBUG: /* The Debug Object is of type "DebugObject" */ Type = ACPI_TYPE_DEBUG_OBJECT; goto Exit; default: ACPI_ERROR ((AE_INFO, "Unknown Reference Class 0x%2.2X", ObjDesc->Reference.Class)); return_ACPI_STATUS (AE_AML_INTERNAL); } } /* * Now we are guaranteed to have an object that has not been created * via the RefOf or Index operators. */ Type = ObjDesc->Common.Type; Exit: /* Convert internal types to external types */ switch (Type) { case ACPI_TYPE_LOCAL_REGION_FIELD: case ACPI_TYPE_LOCAL_BANK_FIELD: case ACPI_TYPE_LOCAL_INDEX_FIELD: Type = ACPI_TYPE_FIELD_UNIT; break; case ACPI_TYPE_LOCAL_SCOPE: /* Per ACPI Specification, Scope is untyped */ Type = ACPI_TYPE_ANY; break; default: /* No change to Type required */ break; } *ReturnType = Type; if (ReturnDesc) { *ReturnDesc = ObjDesc; } return_ACPI_STATUS (AE_OK); }