/******************************************************************************* * * Module Name: nseval - Object evaluation, includes control method execution * ******************************************************************************/ /* * Copyright (C) 2000 - 2017, 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 "acparser.h" #include "acinterp.h" #include "acnamesp.h" #define _COMPONENT ACPI_NAMESPACE ACPI_MODULE_NAME("nseval") /* Local prototypes */ static void acpi_ns_exec_module_code(union acpi_operand_object *method_obj, struct acpi_evaluate_info *info); /******************************************************************************* * * FUNCTION: acpi_ns_evaluate * * PARAMETERS: info - Evaluation info block, contains these fields * and more: * prefix_node - Prefix or Method/Object Node to execute * relative_path - Name of method to execute, If NULL, the * Node is the object to execute * parameters - List of parameters to pass to the method, * terminated by NULL. Params itself may be * NULL if no parameters are being passed. * parameter_type - Type of Parameter list * return_object - Where to put method's return value (if * any). If NULL, no value is returned. * flags - ACPI_IGNORE_RETURN_VALUE to delete return * * RETURN: Status * * DESCRIPTION: Execute a control method or return the current value of an * ACPI namespace object. * * MUTEX: Locks interpreter * ******************************************************************************/ acpi_status acpi_ns_evaluate(struct acpi_evaluate_info *info) { acpi_status status; ACPI_FUNCTION_TRACE(ns_evaluate); if (!info) { return_ACPI_STATUS(AE_BAD_PARAMETER); } if (!info->node) { /* * Get the actual namespace node for the target object if we * need to. Handles these cases: * * 1) Null node, valid pathname from root (absolute path) * 2) Node and valid pathname (path relative to Node) * 3) Node, Null pathname */ status = acpi_ns_get_node(info->prefix_node, info->relative_pathname, ACPI_NS_NO_UPSEARCH, &info->node); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } } /* * For a method alias, we must grab the actual method node so that * proper scoping context will be established before execution. */ if (acpi_ns_get_type(info->node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) { info->node = ACPI_CAST_PTR(struct acpi_namespace_node, info->node->object); } /* Complete the info block initialization */ info->return_object = NULL; info->node_flags = info->node->flags; info->obj_desc = acpi_ns_get_attached_object(info->node); ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n", info->relative_pathname, info->node, acpi_ns_get_attached_object(info->node))); /* Get info if we have a predefined name (_HID, etc.) */ info->predefined = acpi_ut_match_predefined_method(info->node->name.ascii); /* Get the full pathname to the object, for use in warning messages */ info->full_pathname = acpi_ns_get_normalized_pathname(info->node, TRUE); if (!info->full_pathname) { return_ACPI_STATUS(AE_NO_MEMORY); } /* Count the number of arguments being passed in */ info->param_count = 0; if (info->parameters) { while (info->parameters[info->param_count]) { info->param_count++; } /* Warn on impossible argument count */ if (info->param_count > ACPI_METHOD_NUM_ARGS) { ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, ACPI_WARN_ALWAYS, "Excess arguments (%u) - using only %u", info->param_count, ACPI_METHOD_NUM_ARGS)); info->param_count = ACPI_METHOD_NUM_ARGS; } } /* * For predefined names: Check that the declared argument count * matches the ACPI spec -- otherwise this is a BIOS error. */ acpi_ns_check_acpi_compliance(info->full_pathname, info->node, info->predefined); /* * For all names: Check that the incoming argument count for * this method/object matches the actual ASL/AML definition. */ acpi_ns_check_argument_count(info->full_pathname, info->node, info->param_count, info->predefined); /* For predefined names: Typecheck all incoming arguments */ acpi_ns_check_argument_types(info); /* * Three major evaluation cases: * * 1) Object types that cannot be evaluated by definition * 2) The object is a control method -- execute it * 3) The object is not a method -- just return it's current value */ switch (acpi_ns_get_type(info->node)) { case ACPI_TYPE_DEVICE: case ACPI_TYPE_EVENT: case ACPI_TYPE_MUTEX: case ACPI_TYPE_REGION: case ACPI_TYPE_THERMAL: case ACPI_TYPE_LOCAL_SCOPE: /* * 1) Disallow evaluation of certain object types. For these, * object evaluation is undefined and not supported. */ ACPI_ERROR((AE_INFO, "%s: Evaluation of object type [%s] is not supported", info->full_pathname, acpi_ut_get_type_name(info->node->type))); status = AE_TYPE; goto cleanup; case ACPI_TYPE_METHOD: /* * 2) Object is a control method - execute it */ /* Verify that there is a method object associated with this node */ if (!info->obj_desc) { ACPI_ERROR((AE_INFO, "%s: Method has no attached sub-object", info->full_pathname)); status = AE_NULL_OBJECT; goto cleanup; } ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "**** Execute method [%s] at AML address %p length %X\n", info->full_pathname, info->obj_desc->method.aml_start + 1, info->obj_desc->method.aml_length - 1)); /* * Any namespace deletion must acquire both the namespace and * interpreter locks to ensure that no thread is using the portion of * the namespace that is being deleted. * * Execute the method via the interpreter. The interpreter is locked * here before calling into the AML parser */ acpi_ex_enter_interpreter(); status = acpi_ps_execute_method(info); acpi_ex_exit_interpreter(); break; default: /* * 3) All other non-method objects -- get the current object value */ /* * Some objects require additional resolution steps (e.g., the Node * may be a field that must be read, etc.) -- we can't just grab * the object out of the node. * * Use resolve_node_to_value() to get the associated value. * * NOTE: we can get away with passing in NULL for a walk state because * the Node is guaranteed to not be a reference to either a method * local or a method argument (because this interface is never called * from a running method.) * * Even though we do not directly invoke the interpreter for object * resolution, we must lock it because we could access an op_region. * The op_region access code assumes that the interpreter is locked. */ acpi_ex_enter_interpreter(); /* TBD: resolve_node_to_value has a strange interface, fix */ info->return_object = ACPI_CAST_PTR(union acpi_operand_object, info->node); status = acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR (struct acpi_namespace_node, &info->return_object), NULL); acpi_ex_exit_interpreter(); if (ACPI_FAILURE(status)) { info->return_object = NULL; goto cleanup; } ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Returned object %p [%s]\n", info->return_object, acpi_ut_get_object_type_name(info-> return_object))); status = AE_CTRL_RETURN_VALUE; /* Always has a "return value" */ break; } /* * For predefined names, check the return value against the ACPI * specification. Some incorrect return value types are repaired. */ (void)acpi_ns_check_return_value(info->node, info, info->param_count, status, &info->return_object); /* Check if there is a return value that must be dealt with */ if (status == AE_CTRL_RETURN_VALUE) { /* If caller does not want the return value, delete it */ if (info->flags & ACPI_IGNORE_RETURN_VALUE) { acpi_ut_remove_reference(info->return_object); info->return_object = NULL; } /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */ status = AE_OK; } ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "*** Completed evaluation of object %s ***\n", info->relative_pathname)); cleanup: /* * Namespace was unlocked by the handling acpi_ns* function, so we * just free the pathname and return */ ACPI_FREE(info->full_pathname); info->full_pathname = NULL; return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ns_exec_module_code_list * * PARAMETERS: None * * RETURN: None. Exceptions during method execution are ignored, since * we cannot abort a table load. * * DESCRIPTION: Execute all elements of the global module-level code list. * Each element is executed as a single control method. * ******************************************************************************/ void acpi_ns_exec_module_code_list(void) { union acpi_operand_object *prev; union acpi_operand_object *next; struct acpi_evaluate_info *info; u32 method_count = 0; ACPI_FUNCTION_TRACE(ns_exec_module_code_list); /* Exit now if the list is empty */ next = acpi_gbl_module_code_list; if (!next) { return_VOID; } /* Allocate the evaluation information block */ info = ACPI_ALLOCATE(sizeof(struct acpi_evaluate_info)); if (!info) { return_VOID; } /* Walk the list, executing each "method" */ while (next) { prev = next; next = next->method.mutex; /* Clear the link field and execute the method */ prev->method.mutex = NULL; acpi_ns_exec_module_code(prev, info); method_count++; /* Delete the (temporary) method object */ acpi_ut_remove_reference(prev); } ACPI_INFO(("Executed %u blocks of module-level executable AML code", method_count)); ACPI_FREE(info); acpi_gbl_module_code_list = NULL; return_VOID; } /******************************************************************************* * * FUNCTION: acpi_ns_exec_module_code * * PARAMETERS: method_obj - Object container for the module-level code * info - Info block for method evaluation * * RETURN: None. Exceptions during method execution are ignored, since * we cannot abort a table load. * * DESCRIPTION: Execute a control method containing a block of module-level * executable AML code. The control method is temporarily * installed to the root node, then evaluated. * ******************************************************************************/ static void acpi_ns_exec_module_code(union acpi_operand_object *method_obj, struct acpi_evaluate_info *info) { union acpi_operand_object *parent_obj; struct acpi_namespace_node *parent_node; acpi_object_type type; acpi_status status; ACPI_FUNCTION_TRACE(ns_exec_module_code); /* * Get the parent node. We cheat by using the next_object field * of the method object descriptor. */ parent_node = ACPI_CAST_PTR(struct acpi_namespace_node, method_obj->method.next_object); type = acpi_ns_get_type(parent_node); /* * Get the region handler and save it in the method object. We may need * this if an operation region declaration causes a _REG method to be run. * * We can't do this in acpi_ps_link_module_code because * acpi_gbl_root_node->Object is NULL at PASS1. */ if ((type == ACPI_TYPE_DEVICE) && parent_node->object) { method_obj->method.dispatch.handler = parent_node->object->device.handler; } /* Must clear next_object (acpi_ns_attach_object needs the field) */ method_obj->method.next_object = NULL; /* Initialize the evaluation information block */ memset(info, 0, sizeof(struct acpi_evaluate_info)); info->prefix_node = parent_node; /* * Get the currently attached parent object. Add a reference, * because the ref count will be decreased when the method object * is installed to the parent node. */ parent_obj = acpi_ns_get_attached_object(parent_node); if (parent_obj) { acpi_ut_add_reference(parent_obj); } /* Install the method (module-level code) in the parent node */ status = acpi_ns_attach_object(parent_node, method_obj, ACPI_TYPE_METHOD); if (ACPI_FAILURE(status)) { goto exit; } /* Execute the parent node as a control method */ status = acpi_ns_evaluate(info); ACPI_DEBUG_PRINT((ACPI_DB_INIT_NAMES, "Executed module-level code at %p\n", method_obj->method.aml_start)); /* Delete a possible implicit return value (in slack mode) */ if (info->return_object) { acpi_ut_remove_reference(info->return_object); } /* Detach the temporary method object */ acpi_ns_detach_object(parent_node); /* Restore the original parent object */ if (parent_obj) { status = acpi_ns_attach_object(parent_node, parent_obj, type); } else { parent_node->type = (u8)type; } exit: if (parent_obj) { acpi_ut_remove_reference(parent_obj); } return_VOID; }