SH4_MMUCR_URB_SHIFT
(r & SH4_MMUCR_URB_MASK) >> SH4_MMUCR_URB_SHIFT);
urb = (r & SH4_MMUCR_URB_MASK) >> SH4_MMUCR_URB_SHIFT;
limit = limit ? (limit >> SH4_MMUCR_URB_SHIFT) : SH4_UTLB_ENTRY;
cr |= (SH4_UTLB_ENTRY - UPAGES) << SH4_MMUCR_URB_SHIFT;