TSB_START_SIZE
va >>= 22 - TSB_START_SIZE;
_szc = _i - TSB_START_SIZE; \
_slabszc = bigtsb_slab_shift - (TSB_START_SIZE + TSB_ENTRY_SHIFT); \
#define TSB_ENTRIES(tsbsz) (1 << (TSB_START_SIZE + tsbsz))
ktsb_szcode -= TSB_START_SIZE;
ktsb4m_szcode -= TSB_START_SIZE;