SA_CTRL_DP_RBDP
prot->rbdp = (dp_page->prot_bits & SA_CTRL_DP_RBDP) ? 1 :0;
if (dp_changeable->prot_bits & SA_CTRL_DP_RBDP) {
dp_page->prot_bits |= SA_CTRL_DP_RBDP;
dp_page->prot_bits &= ~SA_CTRL_DP_RBDP;