/******************************************************************************* * * Module Name: dsmthdat - control method arguments and local variables * ******************************************************************************/ /* * Copyright (C) 2000 - 2012, 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/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 acpi_ds_method_data_delete_value(u8 type, u32 index, struct acpi_walk_state *walk_state); static acpi_status acpi_ds_method_data_set_value(u8 type, u32 index, union acpi_operand_object *object, struct acpi_walk_state *walk_state); #ifdef ACPI_OBSOLETE_FUNCTIONS acpi_object_type acpi_ds_method_data_get_type(u16 opcode, u32 index, struct acpi_walk_state *walk_state); #endif /******************************************************************************* * * FUNCTION: acpi_ds_method_data_init * * PARAMETERS: walk_state - 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 ref_of and de_ref_of to work properly for these * special data types. * * NOTES: walk_state fields are initialized to zero by the * ACPI_ALLOCATE_ZEROED(). * * A pseudo-Namespace Node is assigned to each argument and local * so that ref_of() can return a pointer to the Node. * ******************************************************************************/ void acpi_ds_method_data_init(struct acpi_walk_state *walk_state) { u32 i; ACPI_FUNCTION_TRACE(ds_method_data_init); /* Init the method arguments */ for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) { ACPI_MOVE_32_TO_32(&walk_state->arguments[i].name, NAMEOF_ARG_NTE); walk_state->arguments[i].name.integer |= (i << 24); walk_state->arguments[i].descriptor_type = ACPI_DESC_TYPE_NAMED; walk_state->arguments[i].type = ACPI_TYPE_ANY; walk_state->arguments[i].flags = ANOBJ_METHOD_ARG; } /* Init the method locals */ for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++) { ACPI_MOVE_32_TO_32(&walk_state->local_variables[i].name, NAMEOF_LOCAL_NTE); walk_state->local_variables[i].name.integer |= (i << 24); walk_state->local_variables[i].descriptor_type = ACPI_DESC_TYPE_NAMED; walk_state->local_variables[i].type = ACPI_TYPE_ANY; walk_state->local_variables[i].flags = ANOBJ_METHOD_LOCAL; } return_VOID; } /******************************************************************************* * * FUNCTION: acpi_ds_method_data_delete_all * * PARAMETERS: walk_state - 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 acpi_ds_method_data_delete_all(struct acpi_walk_state *walk_state) { u32 index; ACPI_FUNCTION_TRACE(ds_method_data_delete_all); /* Detach the locals */ for (index = 0; index < ACPI_METHOD_NUM_LOCALS; index++) { if (walk_state->local_variables[index].object) { ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Local%u=%p\n", index, walk_state->local_variables[index]. object)); /* Detach object (if present) and remove a reference */ acpi_ns_detach_object(&walk_state-> local_variables[index]); } } /* Detach the arguments */ for (index = 0; index < ACPI_METHOD_NUM_ARGS; index++) { if (walk_state->arguments[index].object) { ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Arg%u=%p\n", index, walk_state->arguments[index].object)); /* Detach object (if present) and remove a reference */ acpi_ns_detach_object(&walk_state->arguments[index]); } } return_VOID; } /******************************************************************************* * * FUNCTION: acpi_ds_method_data_init_args * * PARAMETERS: *Params - Pointer to a parameter list for the method * max_param_count - The arg count for this method * walk_state - 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 max_param_count. * ******************************************************************************/ acpi_status acpi_ds_method_data_init_args(union acpi_operand_object **params, u32 max_param_count, struct acpi_walk_state *walk_state) { acpi_status status; u32 index = 0; ACPI_FUNCTION_TRACE_PTR(ds_method_data_init_args, params); if (!params) { ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "No param 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 < max_param_count) && 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 = acpi_ds_method_data_set_value(ACPI_REFCLASS_ARG, index, params[index], walk_state); 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: acpi_ds_method_data_get_node * * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or * ACPI_REFCLASS_ARG * Index - Which Local or Arg whose type to get * walk_state - 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 acpi_ds_method_data_get_node(u8 type, u32 index, struct acpi_walk_state *walk_state, struct acpi_namespace_node **node) { ACPI_FUNCTION_TRACE(ds_method_data_get_node); /* * 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 = &walk_state->local_variables[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 = &walk_state->arguments[index]; break; default: ACPI_ERROR((AE_INFO, "Type %u is invalid", type)); return_ACPI_STATUS(AE_TYPE); } return_ACPI_STATUS(AE_OK); } /******************************************************************************* * * FUNCTION: acpi_ds_method_data_set_value * * 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 * walk_state - 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 acpi_ds_method_data_set_value(u8 type, u32 index, union acpi_operand_object *object, struct acpi_walk_state *walk_state) { acpi_status status; struct acpi_namespace_node *node; ACPI_FUNCTION_TRACE(ds_method_data_set_value); ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "NewObj %p Type %2.2X, Refs=%u [%s]\n", object, type, object->common.reference_count, acpi_ut_get_type_name(object->common.type))); /* Get the namespace node for the arg/local */ status = acpi_ds_method_data_get_node(type, index, walk_state, &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 2.0_c) */ acpi_ut_add_reference(object); /* Install the object */ node->object = object; return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ds_method_data_get_value * * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or * ACPI_REFCLASS_ARG * Index - Which local_var or argument to get * walk_state - Current walk state object * dest_desc - Where Arg or Local value is returned * * RETURN: Status * * DESCRIPTION: Retrieve value of selected Arg or Local for this method * Used only in acpi_ex_resolve_to_value(). * ******************************************************************************/ acpi_status acpi_ds_method_data_get_value(u8 type, u32 index, struct acpi_walk_state *walk_state, union acpi_operand_object **dest_desc) { acpi_status status; struct acpi_namespace_node *node; union acpi_operand_object *object; ACPI_FUNCTION_TRACE(ds_method_data_get_value); /* Validate the object descriptor */ if (!dest_desc) { ACPI_ERROR((AE_INFO, "Null object descriptor pointer")); return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Get the namespace node for the arg/local */ status = acpi_ds_method_data_get_node(type, index, walk_state, &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 local_x/arg_x to an Integer of value zero */ if (acpi_gbl_enable_interpreter_slack) { object = acpi_ut_create_integer_object((u64) 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(local_x,local_x) */ 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 */ *dest_desc = object; acpi_ut_add_reference(object); return_ACPI_STATUS(AE_OK); } /******************************************************************************* * * FUNCTION: acpi_ds_method_data_delete_value * * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or * ACPI_REFCLASS_ARG * Index - Which local_var or argument to delete * walk_state - 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 acpi_ds_method_data_delete_value(u8 type, u32 index, struct acpi_walk_state *walk_state) { acpi_status status; struct acpi_namespace_node *node; union acpi_operand_object *object; ACPI_FUNCTION_TRACE(ds_method_data_delete_value); /* Get the namespace node for the arg/local */ status = acpi_ds_method_data_get_node(type, index, walk_state, &node); if (ACPI_FAILURE(status)) { return_VOID; } /* Get the associated object */ object = acpi_ns_get_attached_object(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. */ acpi_ut_remove_reference(object); } return_VOID; } /******************************************************************************* * * FUNCTION: acpi_ds_store_object_to_local * * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or * ACPI_REFCLASS_ARG * Index - Which Local or Arg to set * obj_desc - Value to be stored * walk_state - Current walk state * * RETURN: Status * * DESCRIPTION: Store a value in an Arg or Local. The obj_desc is installed * as the new value for the Arg or Local and the reference count * for obj_desc is incremented. * ******************************************************************************/ acpi_status acpi_ds_store_object_to_local(u8 type, u32 index, union acpi_operand_object *obj_desc, struct acpi_walk_state *walk_state) { acpi_status status; struct acpi_namespace_node *node; union acpi_operand_object *current_obj_desc; union acpi_operand_object *new_obj_desc; ACPI_FUNCTION_TRACE(ds_store_object_to_local); ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Type=%2.2X Index=%u Obj=%p\n", type, index, obj_desc)); /* Parameter validation */ if (!obj_desc) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Get the namespace node for the arg/local */ status = acpi_ds_method_data_get_node(type, index, walk_state, &node); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } current_obj_desc = acpi_ns_get_attached_object(node); if (current_obj_desc == obj_desc) { ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p already installed!\n", obj_desc)); 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. */ new_obj_desc = obj_desc; if (obj_desc->common.reference_count > 1) { status = acpi_ut_copy_iobject_to_iobject(obj_desc, &new_obj_desc, walk_state); 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 (current_obj_desc) { /* * 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 ref_of (Local4): * * Store (1, Arg0) - Causes indirect store to local4 * Store (1, Local0) - Stores 1 in local0, overwriting * the reference to local4 * Store (1, de_refof (Local0)) - Causes indirect store to local4 * * Weird, but true. */ if (type == ACPI_REFCLASS_ARG) { /* * If we have a valid reference object that came from ref_of(), * do the indirect store */ if ((ACPI_GET_DESCRIPTOR_TYPE(current_obj_desc) == ACPI_DESC_TYPE_OPERAND) && (current_obj_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) && (current_obj_desc->reference.class == ACPI_REFCLASS_REFOF)) { ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Arg (%p) is an ObjRef(Node), storing in node %p\n", new_obj_desc, current_obj_desc)); /* * 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 = acpi_ex_store_object_to_node(new_obj_desc, current_obj_desc-> reference. object, walk_state, ACPI_NO_IMPLICIT_CONVERSION); /* Remove local reference if we copied the object above */ if (new_obj_desc != obj_desc) { acpi_ut_remove_reference(new_obj_desc); } return_ACPI_STATUS(status); } } /* Delete the existing object before storing the new one */ acpi_ds_method_data_delete_value(type, index, walk_state); } /* * Install the Obj descriptor (*new_obj_desc) into * the descriptor for the Arg or Local. * (increments the object reference count by one) */ status = acpi_ds_method_data_set_value(type, index, new_obj_desc, walk_state); /* Remove local reference if we copied the object above */ if (new_obj_desc != obj_desc) { acpi_ut_remove_reference(new_obj_desc); } return_ACPI_STATUS(status); } #ifdef ACPI_OBSOLETE_FUNCTIONS /******************************************************************************* * * FUNCTION: acpi_ds_method_data_get_type * * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP * Index - Which Local or Arg whose type to get * walk_state - 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 acpi_ds_method_data_get_type(u16 opcode, u32 index, struct acpi_walk_state *walk_state) { acpi_status status; struct acpi_namespace_node *node; union acpi_operand_object *object; ACPI_FUNCTION_TRACE(ds_method_data_get_type); /* Get the namespace node for the arg/local */ status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node); if (ACPI_FAILURE(status)) { return_VALUE((ACPI_TYPE_NOT_FOUND)); } /* Get the object */ object = acpi_ns_get_attached_object(node); if (!object) { /* Uninitialized local/arg, return TYPE_ANY */ return_VALUE(ACPI_TYPE_ANY); } /* Get the object type */ return_VALUE(object->type); } #endif