NBXSEG
#define XSEGOFSET (NBXSEG - 1) /* byte offset into xsegment */
#define XSEGOFSET (NBXSEG - 1) /* byte offset into xsegment */
CTASSERT(VM_MIN_KERNEL_ADDRESS % NBXSEG == 0);
const size_t xsegs = (sysmap_size * NBPG + NBXSEG - 1) / NBXSEG;
#define XSEGOFSET (NBXSEG - 1) /* byte offset into xsegment */
const vsize_t vinc = NBXSEG;