1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nsload.c b/drivers/acpi/acpica/nsload.c
new file mode 100644
index 000000000..880260a30
--- /dev/null
+++ b/drivers/acpi/acpica/nsload.c
@@ -0,0 +1,286 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: nsload - namespace loading/expanding/contracting procedures
+ *
+ * Copyright (C) 2000 - 2022, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acnamesp.h"
+#include "acdispat.h"
+#include "actables.h"
+#include "acinterp.h"
+
+#define _COMPONENT          ACPI_NAMESPACE
+ACPI_MODULE_NAME("nsload")
+
+/* Local prototypes */
+#ifdef ACPI_FUTURE_IMPLEMENTATION
+acpi_status acpi_ns_unload_namespace(acpi_handle handle);
+
+static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle);
+#endif
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_load_table
+ *
+ * PARAMETERS:  table_index     - Index for table to be loaded
+ *              node            - Owning NS node
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Load one ACPI table into the namespace
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_load_table(u32 table_index, struct acpi_namespace_node *node)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(ns_load_table);
+
+	/* If table already loaded into namespace, just return */
+
+	if (acpi_tb_is_table_loaded(table_index)) {
+		status = AE_ALREADY_EXISTS;
+		goto unlock;
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			  "**** Loading table into namespace ****\n"));
+
+	status = acpi_tb_allocate_owner_id(table_index);
+	if (ACPI_FAILURE(status)) {
+		goto unlock;
+	}
+
+	/*
+	 * Parse the table and load the namespace with all named
+	 * objects found within. Control methods are NOT parsed
+	 * at this time. In fact, the control methods cannot be
+	 * parsed until the entire namespace is loaded, because
+	 * if a control method makes a forward reference (call)
+	 * to another control method, we can't continue parsing
+	 * because we don't know how many arguments to parse next!
+	 */
+	status = acpi_ns_parse_table(table_index, node);
+	if (ACPI_SUCCESS(status)) {
+		acpi_tb_set_table_loaded_flag(table_index, TRUE);
+	} else {
+		/*
+		 * On error, delete any namespace objects created by this table.
+		 * We cannot initialize these objects, so delete them. There are
+		 * a couple of especially bad cases:
+		 * AE_ALREADY_EXISTS - namespace collision.
+		 * AE_NOT_FOUND - the target of a Scope operator does not
+		 * exist. This target of Scope must already exist in the
+		 * namespace, as per the ACPI specification.
+		 */
+		acpi_ns_delete_namespace_by_owner(acpi_gbl_root_table_list.
+						  tables[table_index].owner_id);
+
+		acpi_tb_release_owner_id(table_index);
+		return_ACPI_STATUS(status);
+	}
+
+unlock:
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/*
+	 * Now we can parse the control methods. We always parse
+	 * them here for a sanity check, and if configured for
+	 * just-in-time parsing, we delete the control method
+	 * parse trees.
+	 */
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			  "**** Begin Table Object Initialization\n"));
+
+	acpi_ex_enter_interpreter();
+	status = acpi_ds_initialize_objects(table_index, node);
+	acpi_ex_exit_interpreter();
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			  "**** Completed Table Object Initialization\n"));
+
+	return_ACPI_STATUS(status);
+}
+
+#ifdef ACPI_OBSOLETE_FUNCTIONS
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_load_namespace
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Load the name space from what ever is pointed to by DSDT.
+ *              (DSDT points to either the BIOS or a buffer.)
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ns_load_namespace(void)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(acpi_load_name_space);
+
+	/* There must be at least a DSDT installed */
+
+	if (acpi_gbl_DSDT == NULL) {
+		ACPI_ERROR((AE_INFO, "DSDT is not in memory"));
+		return_ACPI_STATUS(AE_NO_ACPI_TABLES);
+	}
+
+	/*
+	 * Load the namespace. The DSDT is required,
+	 * but the SSDT and PSDT tables are optional.
+	 */
+	status = acpi_ns_load_table_by_type(ACPI_TABLE_ID_DSDT);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/* Ignore exceptions from these */
+
+	(void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_SSDT);
+	(void)acpi_ns_load_table_by_type(ACPI_TABLE_ID_PSDT);
+
+	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
+			      "ACPI Namespace successfully loaded at root %p\n",
+			      acpi_gbl_root_node));
+
+	return_ACPI_STATUS(status);
+}
+#endif
+
+#ifdef ACPI_FUTURE_IMPLEMENTATION
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_delete_subtree
+ *
+ * PARAMETERS:  start_handle        - Handle in namespace where search begins
+ *
+ * RETURNS      Status
+ *
+ * DESCRIPTION: Walks the namespace starting at the given handle and deletes
+ *              all objects, entries, and scopes in the entire subtree.
+ *
+ *              Namespace/Interpreter should be locked or the subsystem should
+ *              be in shutdown before this routine is called.
+ *
+ ******************************************************************************/
+
+static acpi_status acpi_ns_delete_subtree(acpi_handle start_handle)
+{
+	acpi_status status;
+	acpi_handle child_handle;
+	acpi_handle parent_handle;
+	acpi_handle next_child_handle;
+	acpi_handle dummy;
+	u32 level;
+
+	ACPI_FUNCTION_TRACE(ns_delete_subtree);
+
+	parent_handle = start_handle;
+	child_handle = NULL;
+	level = 1;
+
+	/*
+	 * Traverse the tree of objects until we bubble back up
+	 * to where we started.
+	 */
+	while (level > 0) {
+
+		/* Attempt to get the next object in this scope */
+
+		status = acpi_get_next_object(ACPI_TYPE_ANY, parent_handle,
+					      child_handle, &next_child_handle);
+
+		child_handle = next_child_handle;
+
+		/* Did we get a new object? */
+
+		if (ACPI_SUCCESS(status)) {
+
+			/* Check if this object has any children */
+
+			if (ACPI_SUCCESS
+			    (acpi_get_next_object
+			     (ACPI_TYPE_ANY, child_handle, NULL, &dummy))) {
+				/*
+				 * There is at least one child of this object,
+				 * visit the object
+				 */
+				level++;
+				parent_handle = child_handle;
+				child_handle = NULL;
+			}
+		} else {
+			/*
+			 * No more children in this object, go back up to
+			 * the object's parent
+			 */
+			level--;
+
+			/* Delete all children now */
+
+			acpi_ns_delete_children(child_handle);
+
+			child_handle = parent_handle;
+			status = acpi_get_parent(parent_handle, &parent_handle);
+			if (ACPI_FAILURE(status)) {
+				return_ACPI_STATUS(status);
+			}
+		}
+	}
+
+	/* Now delete the starting object, and we are done */
+
+	acpi_ns_remove_node(child_handle);
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ *  FUNCTION:       acpi_ns_unload_name_space
+ *
+ *  PARAMETERS:     handle          - Root of namespace subtree to be deleted
+ *
+ *  RETURN:         Status
+ *
+ *  DESCRIPTION:    Shrinks the namespace, typically in response to an undocking
+ *                  event. Deletes an entire subtree starting from (and
+ *                  including) the given handle.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ns_unload_namespace(acpi_handle handle)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(ns_unload_name_space);
+
+	/* Parameter validation */
+
+	if (!acpi_gbl_root_node) {
+		return_ACPI_STATUS(AE_NO_NAMESPACE);
+	}
+
+	if (!handle) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/* This function does the real work */
+
+	status = acpi_ns_delete_subtree(handle);
+	return_ACPI_STATUS(status);
+}
+#endif