COBALT_SYS_STAT_EDGE
cobalt_write_bar1(cobalt, COBALT_SYS_STAT_EDGE, 0xffffffff);
u32 edge = cobalt_read_bar1(cobalt, COBALT_SYS_STAT_EDGE);
cobalt_write_bar1(cobalt, COBALT_SYS_STAT_EDGE, edge);