TLB_SIZE_MASK
sz = tlbsize[(hi & TLB_SIZE_MASK) >> TLB_SIZE_SHFT];
#define TLB_HI(epn,size,flags) (((epn)&TLB_EPN_MASK)|(((size)<<TLB_SIZE_SHFT)&TLB_SIZE_MASK)|(flags))
tlbsize = (tlbhi & TLB_SIZE_MASK) >> TLB_SIZE_SHFT;