1 files changed, 487 insertions, 0 deletions

diff --git a/drivers/acpi/namespace/nseval.c b/drivers/acpi/namespace/nseval.c
new file mode 100644
index 000000000000..0d008d53657e
--- /dev/null
+++ b/drivers/acpi/namespace/nseval.c
@@ -0,0 +1,487 @@
+/*******************************************************************************
+ *
+ * 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);
+}
+