Changes in kernel/arch/arm32/src/mm/page.c [9d58539:b0c2075] in mainline

File:

• kernel/arch/arm32/src/mm/page.c (modified) (2 diffs)

kernel/arch/arm32/src/mm/page.c

@@ -52 +52 @@
 void page_arch_init(void)
 {
-        int flags = PAGE_CACHEABLE;
+        int flags = PAGE_CACHEABLE | PAGE_EXEC;
         page_mapping_operations = &pt_mapping_operations;
 
         page_table_lock(AS_KERNEL, true);
         
-        uintptr_t cur;
-
         /* Kernel identity mapping */
-        for (cur = PHYSMEM_START_ADDR;
-            cur < min(config.identity_size, config.physmem_end);
+        //FIXME: We need to consider the possibility that
+        //identity_base > identity_size and physmem_end.
+        //This might lead to overflow if identity_size is too big.
+        for (uintptr_t cur = PHYSMEM_START_ADDR;
+            cur < min(KA2PA(config.identity_base) +
+                config.identity_size, config.physmem_end);
             cur += FRAME_SIZE)
                 page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
@@ -67 +69 @@
 #ifdef HIGH_EXCEPTION_VECTORS
         /* Create mapping for exception table at high offset */
-        uintptr_t ev_frame = (uintptr_t) frame_alloc(ONE_FRAME, FRAME_NONE);
+        uintptr_t ev_frame = frame_alloc(1, FRAME_NONE, 0);
         page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, ev_frame, flags);
 #else