use volatile's on all structures shared between cpu and hifn kill hifn_command_buf_data_t (unnecessary for a long time now)
use volatile's on all structures shared between cpu and hifn
kill hifn_command_buf_data_t (unnecessary for a long time now)

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars