MASK
#define MASK(nbits) ((1 << nbits) - 1)
#define MASK (NCACHE - 1) /* bits to store with */
#define MASK(nbits) ((1 << nbits) - 1)
#define MASK ((uint64_t)-1)
#define MASK ((uint32_t)-1)
MASK = 2,
MASK,
#define MASK(D,M) (0x00040000 | (((M ^ 0xff) & 0xff) << 8ul)|((D) & 0xff))
#define MASK(v) ((1 << (v)) - 1)
#define MASK(entry) (((entry)->eflags & MAP_ENTRY_COW) ? ~VM_PROT_WRITE : \
#undef MASK
#define MASK HEX
#define MASK 0377