Added a status field to memory regions to differentiate allocated and reserved regions

sandbox/memblock/memblock.h

@@ -36,6 +36,8 @@ typedef enum memblock_region_status {
 } memblock_region_status_t;
 
 typedef struct memblock_region {
+	/* the status of the memory region (free, reserved, allocated, etc) */
+	memblock_region_status_t status;
 	/* the address of the first byte that makes up the region */
 	phys_addr_t base;
 	/* the address of the last byte that makes up the region */