DBCR_IAC12MODE
if (dbcr_iac_range(child) & DBCR_IAC12MODE)
if (dbcr_iac_range(child) & DBCR_IAC12MODE) {
dbcr_iac_range(child) &= ~DBCR_IAC12MODE;
if (dbcr_iac_range(child) & DBCR_IAC12MODE)
dbcr_iac_range(current) &= ~DBCR_IAC12MODE;