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Diffstat (limited to 'drivers/acpi/namespace/nseval.c')
-rw-r--r--drivers/acpi/namespace/nseval.c487
1 files changed, 487 insertions, 0 deletions
diff --git a/drivers/acpi/namespace/nseval.c b/drivers/acpi/namespace/nseval.c
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+++ b/drivers/acpi/namespace/nseval.c
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+/*******************************************************************************
+ *
+ * Module Name: nseval - Object evaluation interfaces -- includes control
+ * method lookup and execution.
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2005, R. Byron Moore
+ * 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 <acpi/acparser.h>
+#include <acpi/acinterp.h>
+#include <acpi/acnamesp.h>
+
+
+#define _COMPONENT ACPI_NAMESPACE
+ ACPI_MODULE_NAME ("nseval")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ns_evaluate_relative
+ *
+ * PARAMETERS: Pathname - Name of method to execute, If NULL, the
+ * handle is the object to execute
+ * Info - Method info block
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Find and execute the requested method using the handle as a
+ * scope
+ *
+ * MUTEX: Locks Namespace
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_evaluate_relative (
+ char *pathname,
+ struct acpi_parameter_info *info)
+{
+ acpi_status status;
+ struct acpi_namespace_node *node = NULL;
+ union acpi_generic_state *scope_info;
+ char *internal_path = NULL;
+
+
+ ACPI_FUNCTION_TRACE ("ns_evaluate_relative");
+
+
+ /*
+ * Must have a valid object handle
+ */
+ if (!info || !info->node) {
+ return_ACPI_STATUS (AE_BAD_PARAMETER);
+ }
+
+ /* Build an internal name string for the method */
+
+ status = acpi_ns_internalize_name (pathname, &internal_path);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+
+ scope_info = acpi_ut_create_generic_state ();
+ if (!scope_info) {
+ goto cleanup1;
+ }
+
+ /* Get the prefix handle and Node */
+
+ status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
+ if (ACPI_FAILURE (status)) {
+ goto cleanup;
+ }
+
+ info->node = acpi_ns_map_handle_to_node (info->node);
+ if (!info->node) {
+ (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
+ status = AE_BAD_PARAMETER;
+ goto cleanup;
+ }
+
+ /* Lookup the name in the namespace */
+
+ scope_info->scope.node = info->node;
+ status = acpi_ns_lookup (scope_info, internal_path, ACPI_TYPE_ANY,
+ ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
+ &node);
+
+ (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
+
+ if (ACPI_FAILURE (status)) {
+ ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Object [%s] not found [%s]\n",
+ pathname, acpi_format_exception (status)));
+ goto cleanup;
+ }
+
+ /*
+ * Now that we have a handle to the object, we can attempt to evaluate it.
+ */
+ ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
+ pathname, node, acpi_ns_get_attached_object (node)));
+
+ info->node = node;
+ status = acpi_ns_evaluate_by_handle (info);
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n",
+ pathname));
+
+cleanup:
+ acpi_ut_delete_generic_state (scope_info);
+
+cleanup1:
+ ACPI_MEM_FREE (internal_path);
+ return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ns_evaluate_by_name
+ *
+ * PARAMETERS: Pathname - Fully qualified pathname to the object
+ * Info - Contains:
+ * return_object - Where to put method's return value (if
+ * any). If NULL, no value is returned.
+ * Params - List of parameters to pass to the method,
+ * terminated by NULL. Params itself may be
+ * NULL if no parameters are being passed.
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Find and execute the requested method passing the given
+ * parameters
+ *
+ * MUTEX: Locks Namespace
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_evaluate_by_name (
+ char *pathname,
+ struct acpi_parameter_info *info)
+{
+ acpi_status status;
+ char *internal_path = NULL;
+
+
+ ACPI_FUNCTION_TRACE ("ns_evaluate_by_name");
+
+
+ /* Build an internal name string for the method */
+
+ status = acpi_ns_internalize_name (pathname, &internal_path);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+
+ status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
+ if (ACPI_FAILURE (status)) {
+ goto cleanup;
+ }
+
+ /* Lookup the name in the namespace */
+
+ status = acpi_ns_lookup (NULL, internal_path, ACPI_TYPE_ANY,
+ ACPI_IMODE_EXECUTE, ACPI_NS_NO_UPSEARCH, NULL,
+ &info->node);
+
+ (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
+
+ if (ACPI_FAILURE (status)) {
+ ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+ "Object at [%s] was not found, status=%.4X\n",
+ pathname, status));
+ goto cleanup;
+ }
+
+ /*
+ * Now that we have a handle to the object, we can attempt to evaluate it.
+ */
+ ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
+ pathname, info->node, acpi_ns_get_attached_object (info->node)));
+
+ status = acpi_ns_evaluate_by_handle (info);
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "*** Completed eval of object %s ***\n",
+ pathname));
+
+
+cleanup:
+
+ /* Cleanup */
+
+ if (internal_path) {
+ ACPI_MEM_FREE (internal_path);
+ }
+
+ return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ns_evaluate_by_handle
+ *
+ * PARAMETERS: Handle - Method Node to execute
+ * Params - List of parameters to pass to the method,
+ * terminated by NULL. Params itself may be
+ * NULL if no parameters are being passed.
+ * param_type - Type of Parameter list
+ * return_object - Where to put method's return value (if
+ * any). If NULL, no value is returned.
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Execute the requested method passing the given parameters
+ *
+ * MUTEX: Locks Namespace
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_evaluate_by_handle (
+ struct acpi_parameter_info *info)
+{
+ acpi_status status;
+
+
+ ACPI_FUNCTION_TRACE ("ns_evaluate_by_handle");
+
+
+ /* Check if namespace has been initialized */
+
+ if (!acpi_gbl_root_node) {
+ return_ACPI_STATUS (AE_NO_NAMESPACE);
+ }
+
+ /* Parameter Validation */
+
+ if (!info) {
+ return_ACPI_STATUS (AE_BAD_PARAMETER);
+ }
+
+ /* Initialize the return value to an invalid object */
+
+ info->return_object = NULL;
+
+ /* Get the prefix handle and Node */
+
+ status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+
+ info->node = acpi_ns_map_handle_to_node (info->node);
+ if (!info->node) {
+ (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
+ return_ACPI_STATUS (AE_BAD_PARAMETER);
+ }
+
+ /*
+ * 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);
+ }
+
+ /*
+ * Two major cases here:
+ * 1) The object is an actual control method -- execute it.
+ * 2) The object is not a method -- just return it's current value
+ *
+ * In both cases, the namespace is unlocked by the acpi_ns* procedure
+ */
+ if (acpi_ns_get_type (info->node) == ACPI_TYPE_METHOD) {
+ /*
+ * Case 1) We have an actual control method to execute
+ */
+ status = acpi_ns_execute_control_method (info);
+ }
+ else {
+ /*
+ * Case 2) Object is NOT a method, just return its current value
+ */
+ status = acpi_ns_get_object_value (info);
+ }
+
+ /*
+ * Check if there is a return value on the stack that must be dealt with
+ */
+ if (status == AE_CTRL_RETURN_VALUE) {
+ /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
+
+ status = AE_OK;
+ }
+
+ /*
+ * Namespace was unlocked by the handling acpi_ns* function, so we
+ * just return
+ */
+ return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ns_execute_control_method
+ *
+ * PARAMETERS: Info - Method info block (w/params)
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Execute the requested method passing the given parameters
+ *
+ * MUTEX: Assumes namespace is locked
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_execute_control_method (
+ struct acpi_parameter_info *info)
+{
+ acpi_status status;
+ union acpi_operand_object *obj_desc;
+
+
+ ACPI_FUNCTION_TRACE ("ns_execute_control_method");
+
+
+ /* Verify that there is a method associated with this object */
+
+ obj_desc = acpi_ns_get_attached_object (info->node);
+ if (!obj_desc) {
+ ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No attached method object\n"));
+
+ (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
+ return_ACPI_STATUS (AE_NULL_OBJECT);
+ }
+
+ ACPI_DUMP_PATHNAME (info->node, "Execute Method:",
+ ACPI_LV_INFO, _COMPONENT);
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Method at AML address %p Length %X\n",
+ obj_desc->method.aml_start + 1, obj_desc->method.aml_length - 1));
+
+ /*
+ * Unlock the namespace before execution. This allows namespace access
+ * via the external Acpi* interfaces while a method is being executed.
+ * However, 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.
+ */
+ status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+
+ /*
+ * Execute the method via the interpreter. The interpreter is locked
+ * here before calling into the AML parser
+ */
+ status = acpi_ex_enter_interpreter ();
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+
+ status = acpi_psx_execute (info);
+ acpi_ex_exit_interpreter ();
+
+ return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ns_get_object_value
+ *
+ * PARAMETERS: Info - Method info block (w/params)
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Return the current value of the object
+ *
+ * MUTEX: Assumes namespace is locked, leaves namespace unlocked
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_get_object_value (
+ struct acpi_parameter_info *info)
+{
+ acpi_status status = AE_OK;
+ struct acpi_namespace_node *resolved_node = info->node;
+
+
+ ACPI_FUNCTION_TRACE ("ns_get_object_value");
+
+
+ /*
+ * 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. This call always
+ * deletes obj_desc (allocated above).
+ *
+ * NOTE: we can get away with passing in NULL for a walk state because
+ * obj_desc is guaranteed to not be a reference to either a method local or
+ * a method argument (because this interface can only be called from the
+ * acpi_evaluate external interface, never called from a running method.)
+ *
+ * Even though we do not directly invoke the interpreter for this, we must
+ * enter it because we could access an opregion. The opregion access code
+ * assumes that the interpreter is locked.
+ *
+ * We must release the namespace lock before entering the intepreter.
+ */
+ status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
+ if (ACPI_FAILURE (status)) {
+ return_ACPI_STATUS (status);
+ }
+
+ status = acpi_ex_enter_interpreter ();
+ if (ACPI_SUCCESS (status)) {
+ status = acpi_ex_resolve_node_to_value (&resolved_node, NULL);
+ /*
+ * If acpi_ex_resolve_node_to_value() succeeded, the return value was placed
+ * in resolved_node.
+ */
+ acpi_ex_exit_interpreter ();
+
+ if (ACPI_SUCCESS (status)) {
+ status = AE_CTRL_RETURN_VALUE;
+ info->return_object = ACPI_CAST_PTR
+ (union acpi_operand_object, 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)));
+ }
+ }
+
+ /* Namespace is unlocked */
+
+ return_ACPI_STATUS (status);
+}
+
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