--- /dev/null
+/*******************************************************************************
+ *
+ * Module Name: nseval - Object evaluation, includes control method execution
+ *
+ ******************************************************************************/
+
+/*
+ * 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/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:
+ * 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.
+ * return_object - Where to put method's return value (if
+ * any). If NULL, no value is returned.
+ * 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_external_pathname(info->node);
+ 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)) {
+ 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((AE_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 */
+
+ ACPI_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, "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;
+}
Code Review / kvmfornfv.git / blobdiff