[rt-smart] kernel virtual memory management layer (#6809)

synchronize virtual memory system works.
adding kernel virtual memory management layer for page-based MMU enabled architecture
porting libcpu MMU codes
porting lwp memory related codes

components/mm/avl_adpt.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-11-14     WangXiaoyao  the first version
+ */
+
+#ifndef __MM_AVL_ADPT_H__
+#define __MM_AVL_ADPT_H__
+
+#include <avl.h>
+#include <rtdef.h>
+#include <rtthread.h>
+#include <stdint.h>
+
+#define VAREA_ENTRY(pnode)                                                     \
+    (pnode)                                                                    \
+        ? rt_container_of(rt_container_of(pnode, struct _aspace_node, node),   \
+                          struct rt_varea, node)                               \
+        : 0
+#define ASPACE_VAREA_NEXT(pva) (VAREA_ENTRY(util_avl_next(&pva->node.node)))
+#define ASPACE_VAREA_FIRST(aspace) (VAREA_ENTRY(util_avl_first(&aspace->tree.tree)))
+
+typedef struct _aspace_node
+{
+    struct util_avl_struct node;
+} *_aspace_node_t;
+
+typedef struct _aspace_tree
+{
+    struct util_avl_root tree;
+} *_aspace_tree_t;
+
+#endif /* __MM_AVL_ADPT_H__ */