TCR_T1SZ_SHIFT
#define TCR_T1SZ(x) ((x) << TCR_T1SZ_SHIFT)
static constexpr uint64 T1SZ_MASK = TxSZ_MASK << TCR_T1SZ_SHIFT;
return 64 - ((reg & T1SZ_MASK) >> TCR_T1SZ_SHIFT);