[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

src/Kconfig

@@ -303,6 +303,16 @@ endmenu
 
 menu "Memory Management"
 
+    config RT_PAGE_MAX_ORDER
+        int "Max order of pages allocatable by page allocator"
+        default 11
+        help
+            For example, A value of 11 means the maximum chunk of contiguous memory
+            allocatable by page system is 2^(11 + ARCH_PAGE_BITS - 1) Bytes.
+            Large memory requirement can consume all system resource, and should
+            consider reserved memory instead to enhance system endurance.
+            Max order should at least satisfied usage by huge page.
+
     config RT_USING_MEMPOOL
         bool "Using memory pool"
         default y

src/cpu.c

@@ -247,7 +247,7 @@ void rt_cpus_lock_status_restore(struct rt_thread *thread)
     struct rt_cpu* pcpu = rt_cpu_self();
 
 #if defined(ARCH_MM_MMU) && defined(RT_USING_SMART)
-    lwp_mmu_switch(thread);
+    lwp_aspace_switch(thread);
 #endif
     pcpu->current_thread = thread;
     if (!thread->cpus_lock_nest)