PHYSMAP_ALIGN_MASK
physmap[i] = (physmap[i] + PHYSMAP_ALIGN_MASK) &
~PHYSMAP_ALIGN_MASK;
physmap[i+1] = physmap[i+1] & ~PHYSMAP_ALIGN_MASK;
first = (first + PHYSMAP_ALIGN_MASK) & ~PHYSMAP_ALIGN_MASK;
msgbuf_size = (MSGBUF_SIZE + PHYSMAP_ALIGN_MASK) & ~PHYSMAP_ALIGN_MASK;