1 files changed, 453 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nseval.c b/drivers/acpi/acpica/nseval.c
new file mode 100644
index 00000000..f52829cc
--- /dev/null
+++ b/drivers/acpi/acpica/nseval.c
@@ -0,0 +1,453 @@
+/*******************************************************************************
+ *
+ * Module Name: nseval - Object evaluation, includes control method execution
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2010, 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
+ *                  Pathname        - 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;
+	struct acpi_namespace_node *node;
+
+	ACPI_FUNCTION_TRACE(ns_evaluate);
+
+	if (!info) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/* Initialize the return value to an invalid object */
+
+	info->return_object = NULL;
+	info->param_count = 0;
+
+	/*
+	 * Get the actual namespace node for the target object. Handles these cases:
+	 *
+	 * 1) Null node, Pathname (absolute path)
+	 * 2) Node, Pathname (path relative to Node)
+	 * 3) Node, Null Pathname
+	 */
+	status = acpi_ns_get_node(info->prefix_node, info->pathname,
+				  ACPI_NS_NO_UPSEARCH, &info->resolved_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->resolved_node) ==
+	    ACPI_TYPE_LOCAL_METHOD_ALIAS) {
+		info->resolved_node =
+		    ACPI_CAST_PTR(struct acpi_namespace_node,
+				  info->resolved_node->object);
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n", info->pathname,
+			  info->resolved_node,
+			  acpi_ns_get_attached_object(info->resolved_node)));
+
+	node = info->resolved_node;
+
+	/*
+	 * Two major cases here:
+	 *
+	 * 1) The object is a control method -- execute it
+	 * 2) The object is not a method -- just return it's current value
+	 */
+	if (acpi_ns_get_type(info->resolved_node) == ACPI_TYPE_METHOD) {
+		/*
+		 * 1) Object is a control method - execute it
+		 */
+
+		/* Verify that there is a method object associated with this node */
+
+		info->obj_desc =
+		    acpi_ns_get_attached_object(info->resolved_node);
+		if (!info->obj_desc) {
+			ACPI_ERROR((AE_INFO,
+				    "Control method has no attached sub-object"));
+			return_ACPI_STATUS(AE_NULL_OBJECT);
+		}
+
+		/* Count the number of arguments being passed to the method */
+
+		if (info->parameters) {
+			while (info->parameters[info->param_count]) {
+				if (info->param_count > ACPI_METHOD_MAX_ARG) {
+					return_ACPI_STATUS(AE_LIMIT);
+				}
+				info->param_count++;
+			}
+		}
+
+
+		ACPI_DUMP_PATHNAME(info->resolved_node, "ACPI: Execute Method",
+				   ACPI_LV_INFO, _COMPONENT);
+
+		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+				  "Method at AML address %p Length %X\n",
+				  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();
+	} else {
+		/*
+		 * 2) Object is not a method, return its current value
+		 *
+		 * Disallow certain object types. For these, "evaluation" is undefined.
+		 */
+		switch (info->resolved_node->type) {
+		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:
+
+			ACPI_ERROR((AE_INFO,
+				    "[%4.4s] Evaluation of object type [%s] is not supported",
+				    info->resolved_node->name.ascii,
+				    acpi_ut_get_type_name(info->resolved_node->
+							  type)));
+
+			return_ACPI_STATUS(AE_TYPE);
+
+		default:
+			break;
+		}
+
+		/*
+		 * 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
+		 * resolved_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 opregion.
+		 * The opregion access code assumes that the interpreter is locked.
+		 */
+		acpi_ex_enter_interpreter();
+
+		/* Function has a strange interface */
+
+		status =
+		    acpi_ex_resolve_node_to_value(&info->resolved_node, NULL);
+		acpi_ex_exit_interpreter();
+
+		/*
+		 * If acpi_ex_resolve_node_to_value() succeeded, the return value was placed
+		 * in resolved_node.
+		 */
+		if (ACPI_SUCCESS(status)) {
+			status = AE_CTRL_RETURN_VALUE;
+			info->return_object =
+			    ACPI_CAST_PTR(union acpi_operand_object,
+					  info->resolved_node);
+
+			ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
+					  "Returning object %p [%s]\n",
+					  info->return_object,
+					  acpi_ut_get_object_type_name(info->
+								       return_object)));
+		}
+	}
+
+	/*
+	 * Check input argument count against the ASL-defined count for a method.
+	 * Also check predefined names: argument count and return value against
+	 * the ACPI specification. Some incorrect return value types are repaired.
+	 */
+	(void)acpi_ns_check_predefined_names(node, 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->pathname));
+
+	/*
+	 * Namespace was unlocked by the handling acpi_ns* function, so we
+	 * just return
+	 */
+	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.extra.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;
+}