memblock region iteration can now be bounded to a certain memory range

sandbox/memblock/memblock.h

@@ -24,6 +24,17 @@
 
 typedef uint64_t memblock_index_t;
 
+typedef enum memblock_region_status {
+	/* Used in memblock.memory regions, indicates that the memory region exists */
+	MEMBLOCK_MEMORY = 0,
+	/* Used in memblock.reserved regions, indicates that the memory region was reserved
+	 * by a call to memblock_alloc() */
+	MEMBLOCK_ALLOC,
+	/* Used in memblock.reserved regions, indicates that the memory region was reserved
+	 * by a call to memblock_reserve() */
+	MEMBLOCK_RESERVED,
+} memblock_region_status_t;
+
 typedef struct memblock_region {
 	/* the address of the first byte that makes up the region */
 	uintptr_t base;