Here is a list of all documented files with brief descriptions:

xiomodule.c
xiomodule.h
xiomodule_extra.c
xiomodule_g.c
xiomodule_i.h
xiomodule_intr.c
xiomodule_io.h
xiomodule_l.c
xiomodule_l.h
xiomodule_options.c
xiomodule_selftest.c
xiomodule_stats.c
xiomodule_uart.c
xiomodule_uart_intr.c