TLB44_V
TLB44_V | TLB44_TS;
w0 = va | TLB44_V | TLB44_TS | (enc << TLB44_SIZE_SHFT);
w0 = (u_long)pa | TLB44_V | (TLB44_SIZE_256M << TLB44_SIZE_SHFT);