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- /*******************************************************************************
- *
- * Module Name: dsmthdat - control method arguments and local variables
- *
- ******************************************************************************/
- /*
- * 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 "acpi.h"
- #include "accommon.h"
- #include "acdispat.h"
- #include "acnamesp.h"
- #include "acinterp.h"
- #define _COMPONENT ACPI_DISPATCHER
- ACPI_MODULE_NAME ("dsmthdat")
- /* Local prototypes */
- static void
- AcpiDsMethodDataDeleteValue (
- UINT8 Type,
- UINT32 Index,
- ACPI_WALK_STATE *WalkState);
- static ACPI_STATUS
- AcpiDsMethodDataSetValue (
- UINT8 Type,
- UINT32 Index,
- ACPI_OPERAND_OBJECT *Object,
- ACPI_WALK_STATE *WalkState);
- #ifdef ACPI_OBSOLETE_FUNCTIONS
- ACPI_OBJECT_TYPE
- AcpiDsMethodDataGetType (
- UINT16 Opcode,
- UINT32 Index,
- ACPI_WALK_STATE *WalkState);
- #endif
- /*******************************************************************************
- *
- * FUNCTION: AcpiDsMethodDataInit
- *
- * PARAMETERS: WalkState - Current walk state object
- *
- * RETURN: Status
- *
- * DESCRIPTION: Initialize the data structures that hold the method's arguments
- * and locals. The data struct is an array of namespace nodes for
- * each - this allows RefOf and DeRefOf to work properly for these
- * special data types.
- *
- * NOTES: WalkState fields are initialized to zero by the
- * ACPI_ALLOCATE_ZEROED().
- *
- * A pseudo-Namespace Node is assigned to each argument and local
- * so that RefOf() can return a pointer to the Node.
- *
- ******************************************************************************/
- void
- AcpiDsMethodDataInit (
- ACPI_WALK_STATE *WalkState)
- {
- UINT32 i;
- ACPI_FUNCTION_TRACE (DsMethodDataInit);
- /* Init the method arguments */
- for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++)
- {
- ACPI_MOVE_32_TO_32 (&WalkState->Arguments[i].Name,
- NAMEOF_ARG_NTE);
- WalkState->Arguments[i].Name.Integer |= (i << 24);
- WalkState->Arguments[i].DescriptorType = ACPI_DESC_TYPE_NAMED;
- WalkState->Arguments[i].Type = ACPI_TYPE_ANY;
- WalkState->Arguments[i].Flags = ANOBJ_METHOD_ARG;
- }
- /* Init the method locals */
- for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++)
- {
- ACPI_MOVE_32_TO_32 (&WalkState->LocalVariables[i].Name,
- NAMEOF_LOCAL_NTE);
- WalkState->LocalVariables[i].Name.Integer |= (i << 24);
- WalkState->LocalVariables[i].DescriptorType = ACPI_DESC_TYPE_NAMED;
- WalkState->LocalVariables[i].Type = ACPI_TYPE_ANY;
- WalkState->LocalVariables[i].Flags = ANOBJ_METHOD_LOCAL;
- }
- return_VOID;
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiDsMethodDataDeleteAll
- *
- * PARAMETERS: WalkState - Current walk state object
- *
- * RETURN: None
- *
- * DESCRIPTION: Delete method locals and arguments. Arguments are only
- * deleted if this method was called from another method.
- *
- ******************************************************************************/
- void
- AcpiDsMethodDataDeleteAll (
- ACPI_WALK_STATE *WalkState)
- {
- UINT32 Index;
- ACPI_FUNCTION_TRACE (DsMethodDataDeleteAll);
- /* Detach the locals */
- for (Index = 0; Index < ACPI_METHOD_NUM_LOCALS; Index++)
- {
- if (WalkState->LocalVariables[Index].Object)
- {
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%u=%p\n",
- Index, WalkState->LocalVariables[Index].Object));
- /* Detach object (if present) and remove a reference */
- AcpiNsDetachObject (&WalkState->LocalVariables[Index]);
- }
- }
- /* Detach the arguments */
- for (Index = 0; Index < ACPI_METHOD_NUM_ARGS; Index++)
- {
- if (WalkState->Arguments[Index].Object)
- {
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%u=%p\n",
- Index, WalkState->Arguments[Index].Object));
- /* Detach object (if present) and remove a reference */
- AcpiNsDetachObject (&WalkState->Arguments[Index]);
- }
- }
- return_VOID;
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiDsMethodDataInitArgs
- *
- * PARAMETERS: *Params - Pointer to a parameter list for the method
- * MaxParamCount - The arg count for this method
- * WalkState - Current walk state object
- *
- * RETURN: Status
- *
- * DESCRIPTION: Initialize arguments for a method. The parameter list is a list
- * of ACPI operand objects, either null terminated or whose length
- * is defined by MaxParamCount.
- *
- ******************************************************************************/
- ACPI_STATUS
- AcpiDsMethodDataInitArgs (
- ACPI_OPERAND_OBJECT **Params,
- UINT32 MaxParamCount,
- ACPI_WALK_STATE *WalkState)
- {
- ACPI_STATUS Status;
- UINT32 Index = 0;
- ACPI_FUNCTION_TRACE_PTR (DsMethodDataInitArgs, Params);
- if (!Params)
- {
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
- "No parameter list passed to method\n"));
- return_ACPI_STATUS (AE_OK);
- }
- /* Copy passed parameters into the new method stack frame */
- while ((Index < ACPI_METHOD_NUM_ARGS) &&
- (Index < MaxParamCount) &&
- Params[Index])
- {
- /*
- * A valid parameter.
- * Store the argument in the method/walk descriptor.
- * Do not copy the arg in order to implement call by reference
- */
- Status = AcpiDsMethodDataSetValue (
- ACPI_REFCLASS_ARG, Index, Params[Index], WalkState);
- if (ACPI_FAILURE (Status))
- {
- return_ACPI_STATUS (Status);
- }
- Index++;
- }
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%u args passed to method\n", Index));
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiDsMethodDataGetNode
- *
- * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or
- * ACPI_REFCLASS_ARG
- * Index - Which Local or Arg whose type to get
- * WalkState - Current walk state object
- * Node - Where the node is returned.
- *
- * RETURN: Status and node
- *
- * DESCRIPTION: Get the Node associated with a local or arg.
- *
- ******************************************************************************/
- ACPI_STATUS
- AcpiDsMethodDataGetNode (
- UINT8 Type,
- UINT32 Index,
- ACPI_WALK_STATE *WalkState,
- ACPI_NAMESPACE_NODE **Node)
- {
- ACPI_FUNCTION_TRACE (DsMethodDataGetNode);
- /*
- * Method Locals and Arguments are supported
- */
- switch (Type)
- {
- case ACPI_REFCLASS_LOCAL:
- if (Index > ACPI_METHOD_MAX_LOCAL)
- {
- ACPI_ERROR ((AE_INFO,
- "Local index %u is invalid (max %u)",
- Index, ACPI_METHOD_MAX_LOCAL));
- return_ACPI_STATUS (AE_AML_INVALID_INDEX);
- }
- /* Return a pointer to the pseudo-node */
- *Node = &WalkState->LocalVariables[Index];
- break;
- case ACPI_REFCLASS_ARG:
- if (Index > ACPI_METHOD_MAX_ARG)
- {
- ACPI_ERROR ((AE_INFO,
- "Arg index %u is invalid (max %u)",
- Index, ACPI_METHOD_MAX_ARG));
- return_ACPI_STATUS (AE_AML_INVALID_INDEX);
- }
- /* Return a pointer to the pseudo-node */
- *Node = &WalkState->Arguments[Index];
- break;
- default:
- ACPI_ERROR ((AE_INFO, "Type %u is invalid", Type));
- return_ACPI_STATUS (AE_TYPE);
- }
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiDsMethodDataSetValue
- *
- * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or
- * ACPI_REFCLASS_ARG
- * Index - Which Local or Arg to get
- * Object - Object to be inserted into the stack entry
- * WalkState - Current walk state object
- *
- * RETURN: Status
- *
- * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index.
- * Note: There is no "implicit conversion" for locals.
- *
- ******************************************************************************/
- static ACPI_STATUS
- AcpiDsMethodDataSetValue (
- UINT8 Type,
- UINT32 Index,
- ACPI_OPERAND_OBJECT *Object,
- ACPI_WALK_STATE *WalkState)
- {
- ACPI_STATUS Status;
- ACPI_NAMESPACE_NODE *Node;
- ACPI_FUNCTION_TRACE (DsMethodDataSetValue);
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
- "NewObj %p Type %2.2X, Refs=%u [%s]\n", Object,
- Type, Object->Common.ReferenceCount,
- AcpiUtGetTypeName (Object->Common.Type)));
- /* Get the namespace node for the arg/local */
- Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
- if (ACPI_FAILURE (Status))
- {
- return_ACPI_STATUS (Status);
- }
- /*
- * Increment ref count so object can't be deleted while installed.
- * NOTE: We do not copy the object in order to preserve the call by
- * reference semantics of ACPI Control Method invocation.
- * (See ACPI Specification 2.0C)
- */
- AcpiUtAddReference (Object);
- /* Install the object */
- Node->Object = Object;
- return_ACPI_STATUS (Status);
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiDsMethodDataGetValue
- *
- * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or
- * ACPI_REFCLASS_ARG
- * Index - Which localVar or argument to get
- * WalkState - Current walk state object
- * DestDesc - Where Arg or Local value is returned
- *
- * RETURN: Status
- *
- * DESCRIPTION: Retrieve value of selected Arg or Local for this method
- * Used only in AcpiExResolveToValue().
- *
- ******************************************************************************/
- ACPI_STATUS
- AcpiDsMethodDataGetValue (
- UINT8 Type,
- UINT32 Index,
- ACPI_WALK_STATE *WalkState,
- ACPI_OPERAND_OBJECT **DestDesc)
- {
- ACPI_STATUS Status;
- ACPI_NAMESPACE_NODE *Node;
- ACPI_OPERAND_OBJECT *Object;
- ACPI_FUNCTION_TRACE (DsMethodDataGetValue);
- /* Validate the object descriptor */
- if (!DestDesc)
- {
- ACPI_ERROR ((AE_INFO, "Null object descriptor pointer"));
- return_ACPI_STATUS (AE_BAD_PARAMETER);
- }
- /* Get the namespace node for the arg/local */
- Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
- if (ACPI_FAILURE (Status))
- {
- return_ACPI_STATUS (Status);
- }
- /* Get the object from the node */
- Object = Node->Object;
- /* Examine the returned object, it must be valid. */
- if (!Object)
- {
- /*
- * Index points to uninitialized object.
- * This means that either 1) The expected argument was
- * not passed to the method, or 2) A local variable
- * was referenced by the method (via the ASL)
- * before it was initialized. Either case is an error.
- */
- /* If slack enabled, init the LocalX/ArgX to an Integer of value zero */
- if (AcpiGbl_EnableInterpreterSlack)
- {
- Object = AcpiUtCreateIntegerObject ((UINT64) 0);
- if (!Object)
- {
- return_ACPI_STATUS (AE_NO_MEMORY);
- }
- Node->Object = Object;
- }
- /* Otherwise, return the error */
- else switch (Type)
- {
- case ACPI_REFCLASS_ARG:
- ACPI_ERROR ((AE_INFO,
- "Uninitialized Arg[%u] at node %p",
- Index, Node));
- return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG);
- case ACPI_REFCLASS_LOCAL:
- /*
- * No error message for this case, will be trapped again later to
- * detect and ignore cases of Store(LocalX,LocalX)
- */
- return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL);
- default:
- ACPI_ERROR ((AE_INFO, "Not a Arg/Local opcode: 0x%X", Type));
- return_ACPI_STATUS (AE_AML_INTERNAL);
- }
- }
- /*
- * The Index points to an initialized and valid object.
- * Return an additional reference to the object
- */
- *DestDesc = Object;
- AcpiUtAddReference (Object);
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiDsMethodDataDeleteValue
- *
- * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or
- * ACPI_REFCLASS_ARG
- * Index - Which localVar or argument to delete
- * WalkState - Current walk state object
- *
- * RETURN: None
- *
- * DESCRIPTION: Delete the entry at Opcode:Index. Inserts
- * a null into the stack slot after the object is deleted.
- *
- ******************************************************************************/
- static void
- AcpiDsMethodDataDeleteValue (
- UINT8 Type,
- UINT32 Index,
- ACPI_WALK_STATE *WalkState)
- {
- ACPI_STATUS Status;
- ACPI_NAMESPACE_NODE *Node;
- ACPI_OPERAND_OBJECT *Object;
- ACPI_FUNCTION_TRACE (DsMethodDataDeleteValue);
- /* Get the namespace node for the arg/local */
- Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
- if (ACPI_FAILURE (Status))
- {
- return_VOID;
- }
- /* Get the associated object */
- Object = AcpiNsGetAttachedObject (Node);
- /*
- * Undefine the Arg or Local by setting its descriptor
- * pointer to NULL. Locals/Args can contain both
- * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs
- */
- Node->Object = NULL;
- if ((Object) &&
- (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_OPERAND))
- {
- /*
- * There is a valid object.
- * Decrement the reference count by one to balance the
- * increment when the object was stored.
- */
- AcpiUtRemoveReference (Object);
- }
- return_VOID;
- }
- /*******************************************************************************
- *
- * FUNCTION: AcpiDsStoreObjectToLocal
- *
- * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or
- * ACPI_REFCLASS_ARG
- * Index - Which Local or Arg to set
- * ObjDesc - Value to be stored
- * WalkState - Current walk state
- *
- * RETURN: Status
- *
- * DESCRIPTION: Store a value in an Arg or Local. The ObjDesc is installed
- * as the new value for the Arg or Local and the reference count
- * for ObjDesc is incremented.
- *
- ******************************************************************************/
- ACPI_STATUS
- AcpiDsStoreObjectToLocal (
- UINT8 Type,
- UINT32 Index,
- ACPI_OPERAND_OBJECT *ObjDesc,
- ACPI_WALK_STATE *WalkState)
- {
- ACPI_STATUS Status;
- ACPI_NAMESPACE_NODE *Node;
- ACPI_OPERAND_OBJECT *CurrentObjDesc;
- ACPI_OPERAND_OBJECT *NewObjDesc;
- ACPI_FUNCTION_TRACE (DsStoreObjectToLocal);
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Type=%2.2X Index=%u Obj=%p\n",
- Type, Index, ObjDesc));
- /* Parameter validation */
- if (!ObjDesc)
- {
- return_ACPI_STATUS (AE_BAD_PARAMETER);
- }
- /* Get the namespace node for the arg/local */
- Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
- if (ACPI_FAILURE (Status))
- {
- return_ACPI_STATUS (Status);
- }
- CurrentObjDesc = AcpiNsGetAttachedObject (Node);
- if (CurrentObjDesc == ObjDesc)
- {
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p already installed!\n",
- ObjDesc));
- return_ACPI_STATUS (Status);
- }
- /*
- * If the reference count on the object is more than one, we must
- * take a copy of the object before we store. A reference count
- * of exactly 1 means that the object was just created during the
- * evaluation of an expression, and we can safely use it since it
- * is not used anywhere else.
- */
- NewObjDesc = ObjDesc;
- if (ObjDesc->Common.ReferenceCount > 1)
- {
- Status = AcpiUtCopyIobjectToIobject (
- ObjDesc, &NewObjDesc, WalkState);
- if (ACPI_FAILURE (Status))
- {
- return_ACPI_STATUS (Status);
- }
- }
- /*
- * If there is an object already in this slot, we either
- * have to delete it, or if this is an argument and there
- * is an object reference stored there, we have to do
- * an indirect store!
- */
- if (CurrentObjDesc)
- {
- /*
- * Check for an indirect store if an argument
- * contains an object reference (stored as an Node).
- * We don't allow this automatic dereferencing for
- * locals, since a store to a local should overwrite
- * anything there, including an object reference.
- *
- * If both Arg0 and Local0 contain RefOf (Local4):
- *
- * Store (1, Arg0) - Causes indirect store to local4
- * Store (1, Local0) - Stores 1 in local0, overwriting
- * the reference to local4
- * Store (1, DeRefof (Local0)) - Causes indirect store to local4
- *
- * Weird, but true.
- */
- if (Type == ACPI_REFCLASS_ARG)
- {
- /*
- * If we have a valid reference object that came from RefOf(),
- * do the indirect store
- */
- if ((ACPI_GET_DESCRIPTOR_TYPE (CurrentObjDesc) ==
- ACPI_DESC_TYPE_OPERAND) &&
- (CurrentObjDesc->Common.Type ==
- ACPI_TYPE_LOCAL_REFERENCE) &&
- (CurrentObjDesc->Reference.Class ==
- ACPI_REFCLASS_REFOF))
- {
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
- "Arg (%p) is an ObjRef(Node), storing in node %p\n",
- NewObjDesc, CurrentObjDesc));
- /*
- * Store this object to the Node (perform the indirect store)
- * NOTE: No implicit conversion is performed, as per the ACPI
- * specification rules on storing to Locals/Args.
- */
- Status = AcpiExStoreObjectToNode (NewObjDesc,
- CurrentObjDesc->Reference.Object, WalkState,
- ACPI_NO_IMPLICIT_CONVERSION);
- /* Remove local reference if we copied the object above */
- if (NewObjDesc != ObjDesc)
- {
- AcpiUtRemoveReference (NewObjDesc);
- }
- return_ACPI_STATUS (Status);
- }
- }
- /* Delete the existing object before storing the new one */
- AcpiDsMethodDataDeleteValue (Type, Index, WalkState);
- }
- /*
- * Install the Obj descriptor (*NewObjDesc) into
- * the descriptor for the Arg or Local.
- * (increments the object reference count by one)
- */
- Status = AcpiDsMethodDataSetValue (Type, Index, NewObjDesc, WalkState);
- /* Remove local reference if we copied the object above */
- if (NewObjDesc != ObjDesc)
- {
- AcpiUtRemoveReference (NewObjDesc);
- }
- return_ACPI_STATUS (Status);
- }
- #ifdef ACPI_OBSOLETE_FUNCTIONS
- /*******************************************************************************
- *
- * FUNCTION: AcpiDsMethodDataGetType
- *
- * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
- * Index - Which Local or Arg whose type to get
- * WalkState - Current walk state object
- *
- * RETURN: Data type of current value of the selected Arg or Local
- *
- * DESCRIPTION: Get the type of the object stored in the Local or Arg
- *
- ******************************************************************************/
- ACPI_OBJECT_TYPE
- AcpiDsMethodDataGetType (
- UINT16 Opcode,
- UINT32 Index,
- ACPI_WALK_STATE *WalkState)
- {
- ACPI_STATUS Status;
- ACPI_NAMESPACE_NODE *Node;
- ACPI_OPERAND_OBJECT *Object;
- ACPI_FUNCTION_TRACE (DsMethodDataGetType);
- /* Get the namespace node for the arg/local */
- Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node);
- if (ACPI_FAILURE (Status))
- {
- return_VALUE ((ACPI_TYPE_NOT_FOUND));
- }
- /* Get the object */
- Object = AcpiNsGetAttachedObject (Node);
- if (!Object)
- {
- /* Uninitialized local/arg, return TYPE_ANY */
- return_VALUE (ACPI_TYPE_ANY);
- }
- /* Get the object type */
- return_VALUE (Object->Type);
- }
- #endif
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