#define PROT_READ (1 << 2)
#define PROT_WRITE (1 << 3)
#define PROT_EXEC (1 << 4)
+#define PROT_NONE 0
// identity mapped to region attributes
#define MAP_PRIVATE MAP_RSHARED
#define MAP_EXCLUSIVE 0x0
#define MAP_ANON (1 << 5)
+#define MAP_ANONYMOUS MAP_ANON
#define MAP_STACK 0 // no effect in Lunaix
// other MAP_* goes should beyond 0x20