patch-2.4.0-test3 linux/drivers/acpi/namespace/nsload.c

• Lines: 489
• Date: Wed Jul 5 11:23:12 2000
• Orig file: v2.4.0-test2/linux/drivers/acpi/namespace/nsload.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test2/linux/drivers/acpi/namespace/nsload.c linux/drivers/acpi/namespace/nsload.c
@@ -0,0 +1,488 @@
+
+/******************************************************************************
+ *
+ * Module Name: nsload - namespace loading/expanding/contracting procedures
+ *
+ *****************************************************************************/
+
+/*
+ *  Copyright (C) 2000 R. Byron Moore
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+
+#include "acpi.h"
+#include "interp.h"
+#include "namesp.h"
+#include "amlcode.h"
+#include "parser.h"
+#include "dispatch.h"
+#include "debugger.h"
+
+
+#define _COMPONENT          NAMESPACE
+	 MODULE_NAME         ("nsload");
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    Acpi_ns_parse_table
+ *
+ * PARAMETERS:  Table_desc      - An ACPI table descriptor for table to parse
+ *              Scope           - Where to enter the table into the namespace
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Parse AML within an ACPI table and return a tree of ops
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+acpi_ns_parse_table (
+	ACPI_TABLE_DESC         *table_desc,
+	ACPI_NAME_TABLE         *scope)
+{
+	ACPI_STATUS             status;
+
+
+	/* Create the root object */
+
+	acpi_gbl_parsed_namespace_root = acpi_ps_alloc_op (AML_SCOPE_OP);
+	if (!acpi_gbl_parsed_namespace_root) {
+		return (AE_NO_MEMORY);
+	}
+
+	/* Initialize the root object */
+
+	((ACPI_NAMED_OP *) acpi_gbl_parsed_namespace_root)->name = ACPI_ROOT_NAME;
+
+	/* Pass 1:  Parse everything except control method bodies */
+
+	status = acpi_ps_parse_aml (acpi_gbl_parsed_namespace_root,
+			 table_desc->aml_pointer,
+			 table_desc->aml_length, 0);
+
+	if (ACPI_FAILURE (status)) {
+		return (status);
+	}
+
+
+#ifndef PARSER_ONLY
+	status = acpi_ps_walk_parsed_aml (acpi_ps_get_child (acpi_gbl_parsed_namespace_root),
+			  acpi_gbl_parsed_namespace_root, NULL,
+			  scope, NULL, NULL,
+			  table_desc->table_id,
+			  acpi_ds_load2_begin_op,
+			  acpi_ds_load2_end_op);
+
+
+	/*
+	 * Now that the internal namespace has been constructed, we can delete the
+	 * parsed namespace, since it is no longer needed
+	 */
+
+	acpi_ps_delete_parse_tree (acpi_gbl_parsed_namespace_root);
+	acpi_gbl_parsed_namespace_root = NULL;
+#endif
+
+
+	return (status);
+}
+
+
+/*****************************************************************************
+ *
+ * FUNCTION:    Acpi_ns_load_table
+ *
+ * PARAMETERS:  *Pcode_addr         - Address of pcode block
+ *              Pcode_length        - Length of pcode block
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Mainline of the AML load/dump subsystem. Sets up the
+ *              input engine, calls handler for outermost object type.
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+acpi_ns_load_table (
+	ACPI_TABLE_DESC         *table_desc,
+	ACPI_NAMED_OBJECT       *entry)
+{
+	ACPI_STATUS             status;
+
+
+	if (!table_desc->aml_pointer) {
+		return (AE_BAD_PARAMETER);
+	}
+
+
+	if (!table_desc->aml_length) {
+		return (AE_BAD_PARAMETER);
+	}
+
+
+	/*
+	 * 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!
+	 */
+
+	acpi_cm_acquire_mutex (ACPI_MTX_NAMESPACE);
+	status = acpi_ns_parse_table (table_desc, entry->child_table);
+	acpi_cm_release_mutex (ACPI_MTX_NAMESPACE);
+
+	if (ACPI_FAILURE (status)) {
+		return (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.
+	 */
+
+	status = acpi_ds_initialize_objects (table_desc, entry);
+
+	return (status);
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_ns_load_table_by_type
+ *
+ * PARAMETERS:  Table_type          - Id of the table type to load
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Load an ACPI table or tables into the namespace.  All tables
+ *              of the given type are loaded.  The mechanism allows this
+ *              routine to be called repeatedly.
+ *
+ *****************************************************************************/
+
+ACPI_STATUS
+acpi_ns_load_table_by_type (
+	ACPI_TABLE_TYPE         table_type)
+{
+	u32                     i;
+	ACPI_STATUS             status = AE_OK;
+	ACPI_TABLE_HEADER       *table_ptr;
+	ACPI_TABLE_DESC         *table_desc;
+
+
+	acpi_cm_acquire_mutex (ACPI_MTX_TABLES);
+
+
+	/*
+	 * Table types supported are:
+	 * DSDT (one), SSDT/PSDT (multiple)
+	 */
+
+	switch (table_type)
+	{
+
+	case ACPI_TABLE_DSDT:
+
+		table_desc = &acpi_gbl_acpi_tables[ACPI_TABLE_DSDT];
+
+		/* If table already loaded into namespace, just return */
+
+		if (table_desc->loaded_into_namespace) {
+			goto unlock_and_exit;
+		}
+
+		table_desc->table_id = TABLE_ID_DSDT;
+
+		/* Initialize the root of the namespace tree */
+
+		status = acpi_ns_root_initialize ();
+		if (ACPI_FAILURE (status)) {
+			goto unlock_and_exit;
+		}
+
+		/* Now load the single DSDT */
+
+		status = acpi_ns_load_table (table_desc, acpi_gbl_root_object);
+		if (ACPI_SUCCESS (status)) {
+			table_desc->loaded_into_namespace = TRUE;
+		}
+
+		break;
+
+
+	case ACPI_TABLE_SSDT:
+
+		/*
+		 * Traverse list of SSDT tables
+		 */
+
+		table_desc = &acpi_gbl_acpi_tables[ACPI_TABLE_SSDT];
+		for (i = 0; i < acpi_gbl_acpi_tables[ACPI_TABLE_SSDT].count; i++) {
+			table_ptr = table_desc->pointer;
+
+			/*
+			 * Only attempt to load table if it is not
+			 * already loaded!
+			 */
+
+			if (!table_desc->loaded_into_namespace) {
+				status = acpi_ns_load_table (table_desc,
+						  acpi_gbl_root_object);
+				if (ACPI_FAILURE (status)) {
+					break;
+				}
+
+				table_desc->loaded_into_namespace = TRUE;
+			}
+
+			table_desc = table_desc->next;
+		}
+
+		break;
+
+
+	case ACPI_TABLE_PSDT:
+
+		/*
+		 * Traverse list of PSDT tables
+		 */
+
+		table_desc = &acpi_gbl_acpi_tables[ACPI_TABLE_PSDT];
+
+		for (i = 0; i < acpi_gbl_acpi_tables[ACPI_TABLE_PSDT].count; i++) {
+			table_ptr = table_desc->pointer;
+
+			/* Only attempt to load table if it is not already loaded! */
+
+			if (!table_desc->loaded_into_namespace) {
+				status = acpi_ns_load_table (table_desc,
+						  acpi_gbl_root_object);
+				if (ACPI_FAILURE (status)) {
+					break;
+				}
+
+				table_desc->loaded_into_namespace = TRUE;
+			}
+
+			table_desc = table_desc->next;
+		}
+
+		break;
+
+
+	default:
+		status = AE_SUPPORT;
+	}
+
+
+unlock_and_exit:
+
+	acpi_cm_release_mutex (ACPI_MTX_TABLES);
+
+	return (status);
+
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_ns_free_table_entry
+ *
+ * PARAMETERS:  Entry           - The entry to be deleted
+ *
+ * RETURNS      None
+ *
+ * DESCRIPTION: Free an entry in a namespace table.  Delete any objects contained
+ *              in the entry, unlink the entry, then mark it unused.
+ *
+ ******************************************************************************/
+
+void
+acpi_ns_free_table_entry (
+	ACPI_NAMED_OBJECT       *entry)
+{
+
+	if (!entry) {
+		return;
+	}
+
+	/*
+	 * Need to delete
+	 * 1) The scope, if any
+	 * 2) An attached object, if any
+	 */
+
+	if (entry->child_table) {
+		acpi_cm_free (entry->child_table);
+		entry->child_table = NULL;
+	}
+
+	if (entry->object) {
+		acpi_ns_detach_object (entry->object);
+		entry->object = NULL;
+	}
+
+	/* Mark the entry unallocated */
+
+	entry->name = 0;
+
+	return;
+}
+
+
+/******************************************************************************
+ *
+ * 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.
+ *
+ *              TBD: [Investigate] What if any part of this subtree is in use?
+ *              (i.e. on one of the object stacks?)
+ *
+ ******************************************************************************/
+
+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;
+
+
+	parent_handle   = start_handle;
+	child_handle    = 0;
+	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);
+
+		/*
+		 * Regardless of the success or failure of the
+		 * previous operation, we are done with the previous
+		 * object (if there was one), and any children it
+		 * may have had.  So we can now safely delete it (and
+		 * its scope, if any)
+		 */
+
+		acpi_ns_free_table_entry (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, 0,
+					 &dummy)))
+			{
+				/*
+				 * There is at least one child of this object,
+				 * visit the object
+				 */
+
+				level++;
+				parent_handle   = child_handle;
+				child_handle    = 0;
+			}
+		}
+
+		else {
+			/*
+			 * No more children in this object, go back up to
+			 * the object's parent
+			 */
+			level--;
+			child_handle = parent_handle;
+			acpi_get_parent (parent_handle, &parent_handle);
+		}
+	}
+
+	/* Now delete the starting object, and we are done */
+
+	acpi_ns_free_table_entry ((ACPI_NAMED_OBJECT*) child_handle);
+
+
+	return (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;
+
+
+	/* Parameter validation */
+
+	if (!acpi_gbl_root_object->child_table) {
+		return (AE_NO_NAMESPACE);
+	}
+
+	if (!handle) {
+		return (AE_BAD_PARAMETER);
+	}
+
+
+	/* This function does the real work */
+
+	status = acpi_ns_delete_subtree (handle);
+
+	return (status);
+}
+
+