VPN2_SHIFT
vpn_mask = GENMASK(current_cpu_data.vmbits - 1, VPN2_SHIFT);
vpn = (entryhi & vpn_mask & ~mask) >> VPN2_SHIFT;
pagesz = ilog2((mask >> VPN2_SHIFT) + 1);
vpn_size = 1ULL << (current_cpu_data.vmbits - VPN2_SHIFT);
pagesz = ilog2((PM_4K >> VPN2_SHIFT) + 1);
entryhi = (vpn << VPN2_SHIFT) | asid;