CFG_MODE_1000
ns->CFG_cache & ~(CFG_SB | CFG_MODE_1000 | CFG_SPDSTS);
new_cfg |= CFG_MODE_1000;
new_cfg &= ~CFG_MODE_1000;
((new_cfg ^ ns->CFG_cache) & CFG_MODE_1000)) {
ns->CFG_cache |= CFG_MODE_1000;